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e479628a01
libgit2/src/merge.c
Russell Belfer 98eaf39a87 Fix warnings
2013-11-13 11:12:31 -08:00

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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "posix.h"
#include "buffer.h"
#include "repository.h"
#include "revwalk.h"
#include "commit_list.h"
#include "merge.h"
#include "path.h"
#include "refs.h"
#include "object.h"
#include "iterator.h"
#include "refs.h"
#include "diff.h"
#include "checkout.h"
#include "tree.h"
#include "merge_file.h"
#include "blob.h"
#include "hashsig.h"
#include "oid.h"
#include "index.h"
#include "filebuf.h"
#include "git2/types.h"
#include "git2/repository.h"
#include "git2/object.h"
#include "git2/commit.h"
#include "git2/merge.h"
#include "git2/refs.h"
#include "git2/reset.h"
#include "git2/checkout.h"
#include "git2/signature.h"
#include "git2/config.h"
#include "git2/tree.h"
#include "git2/sys/index.h"
#define GIT_MERGE_INDEX_ENTRY_EXISTS(X) ((X).mode != 0)
typedef enum {
TREE_IDX_ANCESTOR = 0,
TREE_IDX_OURS = 1,
TREE_IDX_THEIRS = 2
} merge_tree_index_t;
/* Tracks D/F conflicts */
struct merge_diff_df_data {
const char *df_path;
const char *prev_path;
git_merge_diff *prev_conflict;
};
/* Merge base computation */
int git_merge_base_many(git_oid *out, git_repository *repo, size_t length, const git_oid input_array[])
{
git_revwalk *walk;
git_vector list;
git_commit_list *result = NULL;
int error = -1;
unsigned int i;
git_commit_list_node *commit;
assert(out && repo && input_array);
if (length < 2) {
giterr_set(GITERR_INVALID, "At least two commits are required to find an ancestor. Provided 'length' was %u.", length);
return -1;
}
if (git_vector_init(&list, length - 1, NULL) < 0)
return -1;
if (git_revwalk_new(&walk, repo) < 0)
goto cleanup;
for (i = 1; i < length; i++) {
commit = git_revwalk__commit_lookup(walk, &input_array[i]);
if (commit == NULL)
goto cleanup;
git_vector_insert(&list, commit);
}
commit = git_revwalk__commit_lookup(walk, &input_array[0]);
if (commit == NULL)
goto cleanup;
if (git_merge__bases_many(&result, walk, commit, &list) < 0)
goto cleanup;
if (!result) {
giterr_set(GITERR_MERGE, "No merge base found");
error = GIT_ENOTFOUND;
goto cleanup;
}
git_oid_cpy(out, &result->item->oid);
error = 0;
cleanup:
git_commit_list_free(&result);
git_revwalk_free(walk);
git_vector_free(&list);
return error;
}
int git_merge_base(git_oid *out, git_repository *repo, const git_oid *one, const git_oid *two)
{
git_revwalk *walk;
git_vector list;
git_commit_list *result = NULL;
git_commit_list_node *commit;
void *contents[1];
if (git_revwalk_new(&walk, repo) < 0)
return -1;
commit = git_revwalk__commit_lookup(walk, two);
if (commit == NULL)
goto on_error;
/* This is just one value, so we can do it on the stack */
memset(&list, 0x0, sizeof(git_vector));
contents[0] = commit;
list.length = 1;
list.contents = contents;
commit = git_revwalk__commit_lookup(walk, one);
if (commit == NULL)
goto on_error;
if (git_merge__bases_many(&result, walk, commit, &list) < 0)
goto on_error;
if (!result) {
git_revwalk_free(walk);
giterr_set(GITERR_MERGE, "No merge base found");
return GIT_ENOTFOUND;
}
git_oid_cpy(out, &result->item->oid);
git_commit_list_free(&result);
git_revwalk_free(walk);
return 0;
on_error:
git_revwalk_free(walk);
return -1;
}
static int interesting(git_pqueue *list)
{
unsigned int i;
/* element 0 isn't used - we need to start at 1 */
for (i = 1; i < list->size; i++) {
git_commit_list_node *commit = list->d[i];
if ((commit->flags & STALE) == 0)
return 1;
}
return 0;
}
int git_merge__bases_many(git_commit_list **out, git_revwalk *walk, git_commit_list_node *one, git_vector *twos)
{
int error;
unsigned int i;
git_commit_list_node *two;
git_commit_list *result = NULL, *tmp = NULL;
git_pqueue list;
/* if the commit is repeated, we have a our merge base already */
git_vector_foreach(twos, i, two) {
if (one == two)
return git_commit_list_insert(one, out) ? 0 : -1;
}
if (git_pqueue_init(&list, twos->length * 2, git_commit_list_time_cmp) < 0)
return -1;
if (git_commit_list_parse(walk, one) < 0)
return -1;
one->flags |= PARENT1;
if (git_pqueue_insert(&list, one) < 0)
return -1;
git_vector_foreach(twos, i, two) {
git_commit_list_parse(walk, two);
two->flags |= PARENT2;
if (git_pqueue_insert(&list, two) < 0)
return -1;
}
/* as long as there are non-STALE commits */
while (interesting(&list)) {
git_commit_list_node *commit;
int flags;
commit = git_pqueue_pop(&list);
flags = commit->flags & (PARENT1 | PARENT2 | STALE);
if (flags == (PARENT1 | PARENT2)) {
if (!(commit->flags & RESULT)) {
commit->flags |= RESULT;
if (git_commit_list_insert(commit, &result) == NULL)
return -1;
}
/* we mark the parents of a merge stale */
flags |= STALE;
}
for (i = 0; i < commit->out_degree; i++) {
git_commit_list_node *p = commit->parents[i];
if ((p->flags & flags) == flags)
continue;
if ((error = git_commit_list_parse(walk, p)) < 0)
return error;
p->flags |= flags;
if (git_pqueue_insert(&list, p) < 0)
return -1;
}
}
git_pqueue_free(&list);
/* filter out any stale commits in the results */
tmp = result;
result = NULL;
while (tmp) {
struct git_commit_list *next = tmp->next;
if (!(tmp->item->flags & STALE))
if (git_commit_list_insert_by_date(tmp->item, &result) == NULL)
return -1;
git__free(tmp);
tmp = next;
}
*out = result;
return 0;
}
int git_repository_mergehead_foreach(git_repository *repo,
git_repository_mergehead_foreach_cb cb,
void *payload)
{
git_buf merge_head_path = GIT_BUF_INIT, merge_head_file = GIT_BUF_INIT;
char *buffer, *line;
size_t line_num = 1;
git_oid oid;
int error = 0;
assert(repo && cb);
if ((error = git_buf_joinpath(&merge_head_path, repo->path_repository,
GIT_MERGE_HEAD_FILE)) < 0)
return error;
if ((error = git_futils_readbuffer(&merge_head_file,
git_buf_cstr(&merge_head_path))) < 0)
goto cleanup;
buffer = merge_head_file.ptr;
while ((line = git__strsep(&buffer, "\n")) != NULL) {
if (strlen(line) != GIT_OID_HEXSZ) {
giterr_set(GITERR_INVALID, "Unable to parse OID - invalid length");
error = -1;
goto cleanup;
}
if ((error = git_oid_fromstr(&oid, line)) < 0)
goto cleanup;
if (cb(&oid, payload) != 0) {
error = GIT_EUSER;
goto cleanup;
}
++line_num;
}
if (*buffer) {
giterr_set(GITERR_MERGE, "No EOL at line %d", line_num);
error = -1;
goto cleanup;
}
cleanup:
git_buf_free(&merge_head_path);
git_buf_free(&merge_head_file);
return error;
}
GIT_INLINE(int) index_entry_cmp(const git_index_entry *a, const git_index_entry *b)
{
int value = 0;
if (a->path == NULL)
return (b->path == NULL) ? 0 : 1;
if ((value = a->mode - b->mode) == 0 &&
(value = git_oid__cmp(&a->oid, &b->oid)) == 0)
value = strcmp(a->path, b->path);
return value;
}
/* Conflict resolution */
static int merge_conflict_resolve_trivial(
int *resolved,
git_merge_diff_list *diff_list,
const git_merge_diff *conflict)
{
int ours_empty, theirs_empty;
int ours_changed, theirs_changed, ours_theirs_differ;
git_index_entry const *result = NULL;
int error = 0;
assert(resolved && diff_list && conflict);
*resolved = 0;
if (conflict->type == GIT_MERGE_DIFF_DIRECTORY_FILE ||
conflict->type == GIT_MERGE_DIFF_RENAMED_ADDED)
return 0;
if (conflict->our_status == GIT_DELTA_RENAMED ||
conflict->their_status == GIT_DELTA_RENAMED)
return 0;
ours_empty = !GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->our_entry);
theirs_empty = !GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->their_entry);
ours_changed = (conflict->our_status != GIT_DELTA_UNMODIFIED);
theirs_changed = (conflict->their_status != GIT_DELTA_UNMODIFIED);
ours_theirs_differ = ours_changed && theirs_changed &&
index_entry_cmp(&conflict->our_entry, &conflict->their_entry);
/*
* Note: with only one ancestor, some cases are not distinct:
*
* 16: ancest:anc1/anc2, head:anc1, remote:anc2 = result:no merge
* 3: ancest:(empty)^, head:head, remote:(empty) = result:no merge
* 2: ancest:(empty)^, head:(empty), remote:remote = result:no merge
*
* Note that the two cases that take D/F conflicts into account
* specifically do not need to be explicitly tested, as D/F conflicts
* would fail the *empty* test:
*
* 3ALT: ancest:(empty)+, head:head, remote:*empty* = result:head
* 2ALT: ancest:(empty)+, head:*empty*, remote:remote = result:remote
*
* Note that many of these cases need not be explicitly tested, as
* they simply degrade to "all different" cases (eg, 11):
*
* 4: ancest:(empty)^, head:head, remote:remote = result:no merge
* 7: ancest:ancest+, head:(empty), remote:remote = result:no merge
* 9: ancest:ancest+, head:head, remote:(empty) = result:no merge
* 11: ancest:ancest+, head:head, remote:remote = result:no merge
*/
/* 5ALT: ancest:*, head:head, remote:head = result:head */
if (ours_changed && !ours_empty && !ours_theirs_differ)
result = &conflict->our_entry;
/* 6: ancest:ancest+, head:(empty), remote:(empty) = result:no merge */
else if (ours_changed && ours_empty && theirs_empty)
*resolved = 0;
/* 8: ancest:ancest^, head:(empty), remote:ancest = result:no merge */
else if (ours_empty && !theirs_changed)
*resolved = 0;
/* 10: ancest:ancest^, head:ancest, remote:(empty) = result:no merge */
else if (!ours_changed && theirs_empty)
*resolved = 0;
/* 13: ancest:ancest+, head:head, remote:ancest = result:head */
else if (ours_changed && !theirs_changed)
result = &conflict->our_entry;
/* 14: ancest:ancest+, head:ancest, remote:remote = result:remote */
else if (!ours_changed && theirs_changed)
result = &conflict->their_entry;
else
*resolved = 0;
if (result != NULL &&
GIT_MERGE_INDEX_ENTRY_EXISTS(*result) &&
(error = git_vector_insert(&diff_list->staged, (void *)result)) >= 0)
*resolved = 1;
/* Note: trivial resolution does not update the REUC. */
return error;
}
static int merge_conflict_resolve_one_removed(
int *resolved,
git_merge_diff_list *diff_list,
const git_merge_diff *conflict)
{
int ours_empty, theirs_empty;
int ours_changed, theirs_changed;
int error = 0;
assert(resolved && diff_list && conflict);
*resolved = 0;
if (conflict->type == GIT_MERGE_DIFF_DIRECTORY_FILE ||
conflict->type == GIT_MERGE_DIFF_RENAMED_ADDED)
return 0;
ours_empty = !GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->our_entry);
theirs_empty = !GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->their_entry);
ours_changed = (conflict->our_status != GIT_DELTA_UNMODIFIED);
theirs_changed = (conflict->their_status != GIT_DELTA_UNMODIFIED);
/* Removed in both */
if (ours_changed && ours_empty && theirs_empty)
*resolved = 1;
/* Removed in ours */
else if (ours_empty && !theirs_changed)
*resolved = 1;
/* Removed in theirs */
else if (!ours_changed && theirs_empty)
*resolved = 1;
if (*resolved)
git_vector_insert(&diff_list->resolved, (git_merge_diff *)conflict);
return error;
}
static int merge_conflict_resolve_one_renamed(
int *resolved,
git_merge_diff_list *diff_list,
const git_merge_diff *conflict)
{
int ours_renamed, theirs_renamed;
int ours_changed, theirs_changed;
git_index_entry *merged;
int error = 0;
assert(resolved && diff_list && conflict);
*resolved = 0;
if (!GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->our_entry) ||
!GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->their_entry))
return 0;
ours_renamed = (conflict->our_status == GIT_DELTA_RENAMED);
theirs_renamed = (conflict->their_status == GIT_DELTA_RENAMED);
if (!ours_renamed && !theirs_renamed)
return 0;
/* Reject one file in a 2->1 conflict */
if (conflict->type == GIT_MERGE_DIFF_BOTH_RENAMED_2_TO_1 ||
conflict->type == GIT_MERGE_DIFF_BOTH_RENAMED_1_TO_2 ||
conflict->type == GIT_MERGE_DIFF_RENAMED_ADDED)
return 0;
ours_changed = (git_oid__cmp(&conflict->ancestor_entry.oid, &conflict->our_entry.oid) != 0);
theirs_changed = (git_oid__cmp(&conflict->ancestor_entry.oid, &conflict->their_entry.oid) != 0);
/* if both are modified (and not to a common target) require a merge */
if (ours_changed && theirs_changed &&
git_oid__cmp(&conflict->our_entry.oid, &conflict->their_entry.oid) != 0)
return 0;
if ((merged = git_pool_malloc(&diff_list->pool, sizeof(git_index_entry))) == NULL)
return -1;
if (ours_changed)
memcpy(merged, &conflict->our_entry, sizeof(git_index_entry));
else
memcpy(merged, &conflict->their_entry, sizeof(git_index_entry));
if (ours_renamed)
merged->path = conflict->our_entry.path;
else
merged->path = conflict->their_entry.path;
*resolved = 1;
git_vector_insert(&diff_list->staged, merged);
git_vector_insert(&diff_list->resolved, (git_merge_diff *)conflict);
return error;
}
static int merge_conflict_resolve_automerge(
int *resolved,
git_merge_diff_list *diff_list,
const git_merge_diff *conflict,
unsigned int automerge_flags)
{
git_merge_file_input ancestor = GIT_MERGE_FILE_INPUT_INIT,
ours = GIT_MERGE_FILE_INPUT_INIT,
theirs = GIT_MERGE_FILE_INPUT_INIT;
git_merge_file_result result = GIT_MERGE_FILE_RESULT_INIT;
git_index_entry *index_entry;
git_odb *odb = NULL;
git_oid automerge_oid;
int error = 0;
assert(resolved && diff_list && conflict);
*resolved = 0;
if (automerge_flags == GIT_MERGE_AUTOMERGE_NONE)
return 0;
/* Reject D/F conflicts */
if (conflict->type == GIT_MERGE_DIFF_DIRECTORY_FILE)
return 0;
/* Reject link/file conflicts. */
if ((S_ISLNK(conflict->ancestor_entry.mode) ^ S_ISLNK(conflict->our_entry.mode)) ||
(S_ISLNK(conflict->ancestor_entry.mode) ^ S_ISLNK(conflict->their_entry.mode)))
return 0;
/* Reject name conflicts */
if (conflict->type == GIT_MERGE_DIFF_BOTH_RENAMED_2_TO_1 ||
conflict->type == GIT_MERGE_DIFF_RENAMED_ADDED)
return 0;
if ((conflict->our_status & GIT_DELTA_RENAMED) == GIT_DELTA_RENAMED &&
(conflict->their_status & GIT_DELTA_RENAMED) == GIT_DELTA_RENAMED &&
strcmp(conflict->ancestor_entry.path, conflict->their_entry.path) != 0)
return 0;
if ((error = git_repository_odb(&odb, diff_list->repo)) < 0 ||
(error = git_merge_file_input_from_index_entry(&ancestor, diff_list->repo, &conflict->ancestor_entry)) < 0 ||
(error = git_merge_file_input_from_index_entry(&ours, diff_list->repo, &conflict->our_entry)) < 0 ||
(error = git_merge_file_input_from_index_entry(&theirs, diff_list->repo, &conflict->their_entry)) < 0 ||
(error = git_merge_files(&result, &ancestor, &ours, &theirs, automerge_flags)) < 0 ||
!result.automergeable ||
(error = git_odb_write(&automerge_oid, odb, result.data, result.len, GIT_OBJ_BLOB)) < 0)
goto done;
if ((index_entry = git_pool_malloc(&diff_list->pool, sizeof(git_index_entry))) == NULL)
GITERR_CHECK_ALLOC(index_entry);
index_entry->path = git_pool_strdup(&diff_list->pool, result.path);
GITERR_CHECK_ALLOC(index_entry->path);
index_entry->file_size = result.len;
index_entry->mode = result.mode;
git_oid_cpy(&index_entry->oid, &automerge_oid);
git_vector_insert(&diff_list->staged, index_entry);
git_vector_insert(&diff_list->resolved, (git_merge_diff *)conflict);
*resolved = 1;
done:
git_merge_file_input_free(&ancestor);
git_merge_file_input_free(&ours);
git_merge_file_input_free(&theirs);
git_merge_file_result_free(&result);
git_odb_free(odb);
return error;
}
static int merge_conflict_resolve(
int *out,
git_merge_diff_list *diff_list,
const git_merge_diff *conflict,
unsigned int automerge_flags)
{
int resolved = 0;
int error = 0;
*out = 0;
if ((error = merge_conflict_resolve_trivial(&resolved, diff_list, conflict)) < 0)
goto done;
if (automerge_flags != GIT_MERGE_AUTOMERGE_NONE) {
if (!resolved && (error = merge_conflict_resolve_one_removed(&resolved, diff_list, conflict)) < 0)
goto done;
if (!resolved && (error = merge_conflict_resolve_one_renamed(&resolved, diff_list, conflict)) < 0)
goto done;
if (!resolved && (error = merge_conflict_resolve_automerge(&resolved, diff_list, conflict, automerge_flags)) < 0)
goto done;
}
*out = resolved;
done:
return error;
}
/* Rename detection and coalescing */
struct merge_diff_similarity {
unsigned char similarity;
size_t other_idx;
};
static int index_entry_similarity_exact(
git_repository *repo,
git_index_entry *a,
size_t a_idx,
git_index_entry *b,
size_t b_idx,
void **cache,
const git_merge_tree_opts *opts)
{
GIT_UNUSED(repo);
GIT_UNUSED(a_idx);
GIT_UNUSED(b_idx);
GIT_UNUSED(cache);
GIT_UNUSED(opts);
if (git_oid__cmp(&a->oid, &b->oid) == 0)
return 100;
return 0;
}
static int index_entry_similarity_calc(
void **out,
git_repository *repo,
git_index_entry *entry,
const git_merge_tree_opts *opts)
{
git_blob *blob;
git_diff_file diff_file = {{{0}}};
git_off_t blobsize;
int error;
*out = NULL;
if ((error = git_blob_lookup(&blob, repo, &entry->oid)) < 0)
return error;
git_oid_cpy(&diff_file.oid, &entry->oid);
diff_file.path = entry->path;
diff_file.size = entry->file_size;
diff_file.mode = entry->mode;
diff_file.flags = 0;
blobsize = git_blob_rawsize(blob);
/* file too big for rename processing */
if (!git__is_sizet(blobsize))
return 0;
error = opts->metric->buffer_signature(out, &diff_file,
git_blob_rawcontent(blob), (size_t)blobsize,
opts->metric->payload);
git_blob_free(blob);
return error;
}
static int index_entry_similarity_inexact(
git_repository *repo,
git_index_entry *a,
size_t a_idx,
git_index_entry *b,
size_t b_idx,
void **cache,
const git_merge_tree_opts *opts)
{
int score = 0;
int error = 0;
if (GIT_MODE_TYPE(a->mode) != GIT_MODE_TYPE(b->mode))
return 0;
/* update signature cache if needed */
if (!cache[a_idx] && (error = index_entry_similarity_calc(&cache[a_idx], repo, a, opts)) < 0)
return error;
if (!cache[b_idx] && (error = index_entry_similarity_calc(&cache[b_idx], repo, b, opts)) < 0)
return error;
/* some metrics may not wish to process this file (too big / too small) */
if (!cache[a_idx] || !cache[b_idx])
return 0;
/* compare signatures */
if (opts->metric->similarity(
&score, cache[a_idx], cache[b_idx], opts->metric->payload) < 0)
return -1;
/* clip score */
if (score < 0)
score = 0;
else if (score > 100)
score = 100;
return score;
}
static int merge_diff_mark_similarity(
git_repository *repo,
git_merge_diff_list *diff_list,
struct merge_diff_similarity *similarity_ours,
struct merge_diff_similarity *similarity_theirs,
int (*similarity_fn)(git_repository *, git_index_entry *, size_t, git_index_entry *, size_t, void **, const git_merge_tree_opts *),
void **cache,
const git_merge_tree_opts *opts)
{
size_t i, j;
git_merge_diff *conflict_src, *conflict_tgt;
int similarity;
git_vector_foreach(&diff_list->conflicts, i, conflict_src) {
/* Items can be the source of a rename iff they have an item in the
* ancestor slot and lack an item in the ours or theirs slot. */
if (!GIT_MERGE_INDEX_ENTRY_EXISTS(conflict_src->ancestor_entry) ||
(GIT_MERGE_INDEX_ENTRY_EXISTS(conflict_src->our_entry) &&
GIT_MERGE_INDEX_ENTRY_EXISTS(conflict_src->their_entry)))
continue;
git_vector_foreach(&diff_list->conflicts, j, conflict_tgt) {
size_t our_idx = diff_list->conflicts.length + j;
size_t their_idx = (diff_list->conflicts.length * 2) + j;
if (GIT_MERGE_INDEX_ENTRY_EXISTS(conflict_tgt->ancestor_entry))
continue;
if (GIT_MERGE_INDEX_ENTRY_EXISTS(conflict_tgt->our_entry) &&
!GIT_MERGE_INDEX_ENTRY_EXISTS(conflict_src->our_entry)) {
similarity = similarity_fn(repo, &conflict_src->ancestor_entry, i, &conflict_tgt->our_entry, our_idx, cache, opts);
if (similarity == GIT_EBUFS)
continue;
else if (similarity < 0)
return similarity;
if (similarity > similarity_ours[i].similarity &&
similarity > similarity_ours[j].similarity) {
/* Clear previous best similarity */
if (similarity_ours[i].similarity > 0)
similarity_ours[similarity_ours[i].other_idx].similarity = 0;
if (similarity_ours[j].similarity > 0)
similarity_ours[similarity_ours[j].other_idx].similarity = 0;
similarity_ours[i].similarity = similarity;
similarity_ours[i].other_idx = j;
similarity_ours[j].similarity = similarity;
similarity_ours[j].other_idx = i;
}
}
if (GIT_MERGE_INDEX_ENTRY_EXISTS(conflict_tgt->their_entry) &&
!GIT_MERGE_INDEX_ENTRY_EXISTS(conflict_src->their_entry)) {
similarity = similarity_fn(repo, &conflict_src->ancestor_entry, i, &conflict_tgt->their_entry, their_idx, cache, opts);
if (similarity > similarity_theirs[i].similarity &&
similarity > similarity_theirs[j].similarity) {
/* Clear previous best similarity */
if (similarity_theirs[i].similarity > 0)
similarity_theirs[similarity_theirs[i].other_idx].similarity = 0;
if (similarity_theirs[j].similarity > 0)
similarity_theirs[similarity_theirs[j].other_idx].similarity = 0;
similarity_theirs[i].similarity = similarity;
similarity_theirs[i].other_idx = j;
similarity_theirs[j].similarity = similarity;
similarity_theirs[j].other_idx = i;
}
}
}
}
return 0;
}
/*
* Rename conflicts:
*
* Ancestor Ours Theirs
*
* 0a A A A No rename
* b A A* A No rename (ours was rewritten)
* c A A A* No rename (theirs rewritten)
* 1a A A B[A] Rename or rename/edit
* b A B[A] A (automergeable)
* 2 A B[A] B[A] Both renamed (automergeable)
* 3a A B[A] Rename/delete
* b A B[A] (same)
* 4a A B[A] B Rename/add [B~ours B~theirs]
* b A B B[A] (same)
* 5 A B[A] C[A] Both renamed ("1 -> 2")
* 6 A C[A] Both renamed ("2 -> 1")
* B C[B] [C~ours C~theirs] (automergeable)
*/
static void merge_diff_mark_rename_conflict(
git_merge_diff_list *diff_list,
struct merge_diff_similarity *similarity_ours,
bool ours_renamed,
size_t ours_source_idx,
struct merge_diff_similarity *similarity_theirs,
bool theirs_renamed,
size_t theirs_source_idx,
git_merge_diff *target,
const git_merge_tree_opts *opts)
{
git_merge_diff *ours_source = NULL, *theirs_source = NULL;
if (ours_renamed)
ours_source = diff_list->conflicts.contents[ours_source_idx];
if (theirs_renamed)
theirs_source = diff_list->conflicts.contents[theirs_source_idx];
/* Detect 2->1 conflicts */
if (ours_renamed && theirs_renamed) {
/* Both renamed to the same target name. */
if (ours_source_idx == theirs_source_idx)
ours_source->type = GIT_MERGE_DIFF_BOTH_RENAMED;
else {
ours_source->type = GIT_MERGE_DIFF_BOTH_RENAMED_2_TO_1;
theirs_source->type = GIT_MERGE_DIFF_BOTH_RENAMED_2_TO_1;
}
} else if (ours_renamed) {
/* If our source was also renamed in theirs, this is a 1->2 */
if (similarity_theirs[ours_source_idx].similarity >= opts->rename_threshold)
ours_source->type = GIT_MERGE_DIFF_BOTH_RENAMED_1_TO_2;
else if (GIT_MERGE_INDEX_ENTRY_EXISTS(target->their_entry)) {
ours_source->type = GIT_MERGE_DIFF_RENAMED_ADDED;
target->type = GIT_MERGE_DIFF_RENAMED_ADDED;
}
else if (!GIT_MERGE_INDEX_ENTRY_EXISTS(ours_source->their_entry))
ours_source->type = GIT_MERGE_DIFF_RENAMED_DELETED;
else if (ours_source->type == GIT_MERGE_DIFF_MODIFIED_DELETED)
ours_source->type = GIT_MERGE_DIFF_RENAMED_MODIFIED;
} else if (theirs_renamed) {
/* If their source was also renamed in ours, this is a 1->2 */
if (similarity_ours[theirs_source_idx].similarity >= opts->rename_threshold)
theirs_source->type = GIT_MERGE_DIFF_BOTH_RENAMED_1_TO_2;
else if (GIT_MERGE_INDEX_ENTRY_EXISTS(target->our_entry)) {
theirs_source->type = GIT_MERGE_DIFF_RENAMED_ADDED;
target->type = GIT_MERGE_DIFF_RENAMED_ADDED;
}
else if (!GIT_MERGE_INDEX_ENTRY_EXISTS(theirs_source->our_entry))
theirs_source->type = GIT_MERGE_DIFF_RENAMED_DELETED;
else if (theirs_source->type == GIT_MERGE_DIFF_MODIFIED_DELETED)
theirs_source->type = GIT_MERGE_DIFF_RENAMED_MODIFIED;
}
}
GIT_INLINE(void) merge_diff_coalesce_rename(
git_index_entry *source_entry,
git_delta_t *source_status,
git_index_entry *target_entry,
git_delta_t *target_status)
{
/* Coalesce the rename target into the rename source. */
memcpy(source_entry, target_entry, sizeof(git_index_entry));
*source_status = GIT_DELTA_RENAMED;
memset(target_entry, 0x0, sizeof(git_index_entry));
*target_status = GIT_DELTA_UNMODIFIED;
}
static void merge_diff_list_coalesce_renames(
git_merge_diff_list *diff_list,
struct merge_diff_similarity *similarity_ours,
struct merge_diff_similarity *similarity_theirs,
const git_merge_tree_opts *opts)
{
size_t i;
bool ours_renamed = 0, theirs_renamed = 0;
size_t ours_source_idx = 0, theirs_source_idx = 0;
git_merge_diff *ours_source, *theirs_source, *target;
for (i = 0; i < diff_list->conflicts.length; i++) {
target = diff_list->conflicts.contents[i];
ours_renamed = 0;
theirs_renamed = 0;
if (GIT_MERGE_INDEX_ENTRY_EXISTS(target->our_entry) &&
similarity_ours[i].similarity >= opts->rename_threshold) {
ours_source_idx = similarity_ours[i].other_idx;
ours_source = diff_list->conflicts.contents[ours_source_idx];
merge_diff_coalesce_rename(
&ours_source->our_entry,
&ours_source->our_status,
&target->our_entry,
&target->our_status);
similarity_ours[ours_source_idx].similarity = 0;
similarity_ours[i].similarity = 0;
ours_renamed = 1;
}
/* insufficient to determine direction */
if (GIT_MERGE_INDEX_ENTRY_EXISTS(target->their_entry) &&
similarity_theirs[i].similarity >= opts->rename_threshold) {
theirs_source_idx = similarity_theirs[i].other_idx;
theirs_source = diff_list->conflicts.contents[theirs_source_idx];
merge_diff_coalesce_rename(
&theirs_source->their_entry,
&theirs_source->their_status,
&target->their_entry,
&target->their_status);
similarity_theirs[theirs_source_idx].similarity = 0;
similarity_theirs[i].similarity = 0;
theirs_renamed = 1;
}
merge_diff_mark_rename_conflict(diff_list,
similarity_ours, ours_renamed, ours_source_idx,
similarity_theirs, theirs_renamed, theirs_source_idx,
target, opts);
}
}
static int merge_diff_empty(const git_vector *conflicts, size_t idx)
{
git_merge_diff *conflict = conflicts->contents[idx];
return (!GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->ancestor_entry) &&
!GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->our_entry) &&
!GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->their_entry));
}
static void merge_diff_list_count_candidates(
git_merge_diff_list *diff_list,
size_t *src_count,
size_t *tgt_count)
{
git_merge_diff *entry;
size_t i;
*src_count = 0;
*tgt_count = 0;
git_vector_foreach(&diff_list->conflicts, i, entry) {
if (GIT_MERGE_INDEX_ENTRY_EXISTS(entry->ancestor_entry) &&
(!GIT_MERGE_INDEX_ENTRY_EXISTS(entry->our_entry) ||
!GIT_MERGE_INDEX_ENTRY_EXISTS(entry->their_entry)))
src_count++;
else if (!GIT_MERGE_INDEX_ENTRY_EXISTS(entry->ancestor_entry))
tgt_count++;
}
}
int git_merge_diff_list__find_renames(
git_repository *repo,
git_merge_diff_list *diff_list,
const git_merge_tree_opts *opts)
{
struct merge_diff_similarity *similarity_ours, *similarity_theirs;
void **cache = NULL;
size_t cache_size = 0;
size_t src_count, tgt_count, i;
int error = 0;
assert(diff_list && opts);
if ((opts->flags & GIT_MERGE_TREE_FIND_RENAMES) == 0)
return 0;
similarity_ours = git__calloc(diff_list->conflicts.length,
sizeof(struct merge_diff_similarity));
GITERR_CHECK_ALLOC(similarity_ours);
similarity_theirs = git__calloc(diff_list->conflicts.length,
sizeof(struct merge_diff_similarity));
GITERR_CHECK_ALLOC(similarity_theirs);
/* Calculate similarity between items that were deleted from the ancestor
* and added in the other branch.
*/
if ((error = merge_diff_mark_similarity(repo, diff_list, similarity_ours,
similarity_theirs, index_entry_similarity_exact, NULL, opts)) < 0)
goto done;
if (diff_list->conflicts.length <= opts->target_limit) {
cache_size = diff_list->conflicts.length * 3;
cache = git__calloc(cache_size, sizeof(void *));
GITERR_CHECK_ALLOC(cache);
merge_diff_list_count_candidates(diff_list, &src_count, &tgt_count);
if (src_count > opts->target_limit || tgt_count > opts->target_limit) {
/* TODO: report! */
} else {
if ((error = merge_diff_mark_similarity(
repo, diff_list, similarity_ours, similarity_theirs,
index_entry_similarity_inexact, cache, opts)) < 0)
goto done;
}
}
/* For entries that are appropriately similar, merge the new name's entry
* into the old name.
*/
merge_diff_list_coalesce_renames(diff_list, similarity_ours, similarity_theirs, opts);
/* And remove any entries that were merged and are now empty. */
git_vector_remove_matching(&diff_list->conflicts, merge_diff_empty);
done:
if (cache != NULL) {
for (i = 0; i < cache_size; ++i) {
if (cache[i] != NULL)
opts->metric->free_signature(cache[i], opts->metric->payload);
}
git__free(cache);
}
git__free(similarity_ours);
git__free(similarity_theirs);
return error;
}
/* Directory/file conflict handling */
GIT_INLINE(const char *) merge_diff_path(
const git_merge_diff *conflict)
{
if (GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->ancestor_entry))
return conflict->ancestor_entry.path;
else if (GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->our_entry))
return conflict->our_entry.path;
else if (GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->their_entry))
return conflict->their_entry.path;
return NULL;
}
GIT_INLINE(bool) merge_diff_any_side_added_or_modified(
const git_merge_diff *conflict)
{
if (conflict->our_status == GIT_DELTA_ADDED ||
conflict->our_status == GIT_DELTA_MODIFIED ||
conflict->their_status == GIT_DELTA_ADDED ||
conflict->their_status == GIT_DELTA_MODIFIED)
return true;
return false;
}
GIT_INLINE(bool) path_is_prefixed(const char *parent, const char *child)
{
size_t child_len = strlen(child);
size_t parent_len = strlen(parent);
if (child_len < parent_len ||
strncmp(parent, child, parent_len) != 0)
return 0;
return (child[parent_len] == '/');
}
GIT_INLINE(int) merge_diff_detect_df_conflict(
struct merge_diff_df_data *df_data,
git_merge_diff *conflict)
{
const char *cur_path = merge_diff_path(conflict);
/* Determine if this is a D/F conflict or the child of one */
if (df_data->df_path &&
path_is_prefixed(df_data->df_path, cur_path))
conflict->type = GIT_MERGE_DIFF_DF_CHILD;
else if(df_data->df_path)
df_data->df_path = NULL;
else if (df_data->prev_path &&
merge_diff_any_side_added_or_modified(df_data->prev_conflict) &&
merge_diff_any_side_added_or_modified(conflict) &&
path_is_prefixed(df_data->prev_path, cur_path)) {
conflict->type = GIT_MERGE_DIFF_DF_CHILD;
df_data->prev_conflict->type = GIT_MERGE_DIFF_DIRECTORY_FILE;
df_data->df_path = df_data->prev_path;
}
df_data->prev_path = cur_path;
df_data->prev_conflict = conflict;
return 0;
}
/* Conflict handling */
GIT_INLINE(int) merge_diff_detect_type(
git_merge_diff *conflict)
{
if (conflict->our_status == GIT_DELTA_ADDED &&
conflict->their_status == GIT_DELTA_ADDED)
conflict->type = GIT_MERGE_DIFF_BOTH_ADDED;
else if (conflict->our_status == GIT_DELTA_MODIFIED &&
conflict->their_status == GIT_DELTA_MODIFIED)
conflict->type = GIT_MERGE_DIFF_BOTH_MODIFIED;
else if (conflict->our_status == GIT_DELTA_DELETED &&
conflict->their_status == GIT_DELTA_DELETED)
conflict->type = GIT_MERGE_DIFF_BOTH_DELETED;
else if (conflict->our_status == GIT_DELTA_MODIFIED &&
conflict->their_status == GIT_DELTA_DELETED)
conflict->type = GIT_MERGE_DIFF_MODIFIED_DELETED;
else if (conflict->our_status == GIT_DELTA_DELETED &&
conflict->their_status == GIT_DELTA_MODIFIED)
conflict->type = GIT_MERGE_DIFF_MODIFIED_DELETED;
else
conflict->type = GIT_MERGE_DIFF_NONE;
return 0;
}
GIT_INLINE(int) index_entry_dup(
git_index_entry *out,
git_pool *pool,
const git_index_entry *src)
{
if (src != NULL) {
memcpy(out, src, sizeof(git_index_entry));
if ((out->path = git_pool_strdup(pool, src->path)) == NULL)
return -1;
}
return 0;
}
GIT_INLINE(int) merge_delta_type_from_index_entries(
const git_index_entry *ancestor,
const git_index_entry *other)
{
if (ancestor == NULL && other == NULL)
return GIT_DELTA_UNMODIFIED;
else if (ancestor == NULL && other != NULL)
return GIT_DELTA_ADDED;
else if (ancestor != NULL && other == NULL)
return GIT_DELTA_DELETED;
else if (S_ISDIR(ancestor->mode) ^ S_ISDIR(other->mode))
return GIT_DELTA_TYPECHANGE;
else if(S_ISLNK(ancestor->mode) ^ S_ISLNK(other->mode))
return GIT_DELTA_TYPECHANGE;
else if (git_oid__cmp(&ancestor->oid, &other->oid) ||
ancestor->mode != other->mode)
return GIT_DELTA_MODIFIED;
return GIT_DELTA_UNMODIFIED;
}
static git_merge_diff *merge_diff_from_index_entries(
git_merge_diff_list *diff_list,
const git_index_entry **entries)
{
git_merge_diff *conflict;
git_pool *pool = &diff_list->pool;
if ((conflict = git_pool_malloc(pool, sizeof(git_merge_diff))) == NULL)
return NULL;
if (index_entry_dup(&conflict->ancestor_entry, pool, entries[TREE_IDX_ANCESTOR]) < 0 ||
index_entry_dup(&conflict->our_entry, pool, entries[TREE_IDX_OURS]) < 0 ||
index_entry_dup(&conflict->their_entry, pool, entries[TREE_IDX_THEIRS]) < 0)
return NULL;
conflict->our_status = merge_delta_type_from_index_entries(
entries[TREE_IDX_ANCESTOR], entries[TREE_IDX_OURS]);
conflict->their_status = merge_delta_type_from_index_entries(
entries[TREE_IDX_ANCESTOR], entries[TREE_IDX_THEIRS]);
return conflict;
}
/* Merge trees */
static int merge_index_insert_conflict(
git_merge_diff_list *diff_list,
struct merge_diff_df_data *merge_df_data,
const git_index_entry *tree_items[3])
{
git_merge_diff *conflict;
if ((conflict = merge_diff_from_index_entries(diff_list, tree_items)) == NULL ||
merge_diff_detect_type(conflict) < 0 ||
merge_diff_detect_df_conflict(merge_df_data, conflict) < 0 ||
git_vector_insert(&diff_list->conflicts, conflict) < 0)
return -1;
return 0;
}
static int merge_index_insert_unmodified(
git_merge_diff_list *diff_list,
const git_index_entry *tree_items[3])
{
int error = 0;
git_index_entry *entry;
entry = git_pool_malloc(&diff_list->pool, sizeof(git_index_entry));
GITERR_CHECK_ALLOC(entry);
if ((error = index_entry_dup(entry, &diff_list->pool, tree_items[0])) >= 0)
error = git_vector_insert(&diff_list->staged, entry);
return error;
}
int git_merge_diff_list__find_differences(
git_merge_diff_list *diff_list,
const git_tree *ancestor_tree,
const git_tree *our_tree,
const git_tree *their_tree)
{
git_iterator *iterators[3] = {0};
const git_index_entry *items[3] = {0}, *best_cur_item, *cur_items[3];
git_vector_cmp entry_compare = git_index_entry__cmp;
struct merge_diff_df_data df_data = {0};
int cur_item_modified;
size_t i, j;
int error = 0;
assert(diff_list && our_tree && their_tree);
if ((error = git_iterator_for_tree(&iterators[TREE_IDX_ANCESTOR], (git_tree *)ancestor_tree, GIT_ITERATOR_DONT_IGNORE_CASE, NULL, NULL)) < 0 ||
(error = git_iterator_for_tree(&iterators[TREE_IDX_OURS], (git_tree *)our_tree, GIT_ITERATOR_DONT_IGNORE_CASE, NULL, NULL)) < 0 ||
(error = git_iterator_for_tree(&iterators[TREE_IDX_THEIRS], (git_tree *)their_tree, GIT_ITERATOR_DONT_IGNORE_CASE, NULL, NULL)) < 0)
goto done;
/* Set up the iterators */
for (i = 0; i < 3; i++) {
error = git_iterator_current(&items[i], iterators[i]);
if (error < 0 && error != GIT_ITEROVER)
goto done;
}
while (true) {
for (i = 0; i < 3; i++)
cur_items[i] = NULL;
best_cur_item = NULL;
cur_item_modified = 0;
/* Find the next path(s) to consume from each iterator */
for (i = 0; i < 3; i++) {
if (items[i] == NULL) {
cur_item_modified = 1;
continue;
}
if (best_cur_item == NULL) {
best_cur_item = items[i];
cur_items[i] = items[i];
} else {
int path_diff = entry_compare(items[i], best_cur_item);
if (path_diff < 0) {
/*
* Found an item that sorts before our current item, make
* our current item this one.
*/
for (j = 0; j < i; j++)
cur_items[j] = NULL;
cur_item_modified = 1;
best_cur_item = items[i];
cur_items[i] = items[i];
} else if (path_diff > 0) {
/* No entry for the current item, this is modified */
cur_item_modified = 1;
} else if (path_diff == 0) {
cur_items[i] = items[i];
if (!cur_item_modified)
cur_item_modified = index_entry_cmp(best_cur_item, items[i]);
}
}
}
if (best_cur_item == NULL)
break;
if (cur_item_modified)
error = merge_index_insert_conflict(diff_list, &df_data, cur_items);
else
error = merge_index_insert_unmodified(diff_list, cur_items);
if (error < 0)
goto done;
/* Advance each iterator that participated */
for (i = 0; i < 3; i++) {
if (cur_items[i] == NULL)
continue;
error = git_iterator_advance(&items[i], iterators[i]);
if (error < 0 && error != GIT_ITEROVER)
goto done;
}
}
done:
for (i = 0; i < 3; i++)
git_iterator_free(iterators[i]);
if (error == GIT_ITEROVER)
error = 0;
return error;
}
git_merge_diff_list *git_merge_diff_list__alloc(git_repository *repo)
{
git_merge_diff_list *diff_list = git__calloc(1, sizeof(git_merge_diff_list));
if (diff_list == NULL)
return NULL;
diff_list->repo = repo;
if (git_vector_init(&diff_list->staged, 0, NULL) < 0 ||
git_vector_init(&diff_list->conflicts, 0, NULL) < 0 ||
git_vector_init(&diff_list->resolved, 0, NULL) < 0 ||
git_pool_init(&diff_list->pool, 1, 0) < 0)
return NULL;
return diff_list;
}
void git_merge_diff_list__free(git_merge_diff_list *diff_list)
{
if (!diff_list)
return;
git_vector_free(&diff_list->staged);
git_vector_free(&diff_list->conflicts);
git_vector_free(&diff_list->resolved);
git_pool_clear(&diff_list->pool);
git__free(diff_list);
}
static int merge_tree_normalize_opts(
git_repository *repo,
git_merge_tree_opts *opts,
const git_merge_tree_opts *given)
{
git_config *cfg = NULL;
int error = 0;
assert(repo && opts);
if ((error = git_repository_config__weakptr(&cfg, repo)) < 0)
return error;
if (given != NULL)
memcpy(opts, given, sizeof(git_merge_tree_opts));
else {
git_merge_tree_opts init = GIT_MERGE_TREE_OPTS_INIT;
memcpy(opts, &init, sizeof(init));
opts->flags = GIT_MERGE_TREE_FIND_RENAMES;
opts->rename_threshold = GIT_MERGE_TREE_RENAME_THRESHOLD;
}
if (!opts->target_limit) {
int32_t limit = 0;
opts->target_limit = GIT_MERGE_TREE_TARGET_LIMIT;
if (git_config_get_int32(&limit, cfg, "merge.renameLimit") < 0) {
giterr_clear();
if (git_config_get_int32(&limit, cfg, "diff.renameLimit") < 0)
giterr_clear();
}
if (limit > 0)
opts->target_limit = limit;
}
/* assign the internal metric with whitespace flag as payload */
if (!opts->metric) {
opts->metric = git__malloc(sizeof(git_diff_similarity_metric));
GITERR_CHECK_ALLOC(opts->metric);
opts->metric->file_signature = git_diff_find_similar__hashsig_for_file;
opts->metric->buffer_signature = git_diff_find_similar__hashsig_for_buf;
opts->metric->free_signature = git_diff_find_similar__hashsig_free;
opts->metric->similarity = git_diff_find_similar__calc_similarity;
if (opts->flags & GIT_DIFF_FIND_IGNORE_WHITESPACE)
opts->metric->payload = (void *)GIT_HASHSIG_IGNORE_WHITESPACE;
else if (opts->flags & GIT_DIFF_FIND_DONT_IGNORE_WHITESPACE)
opts->metric->payload = (void *)GIT_HASHSIG_NORMAL;
else
opts->metric->payload = (void *)GIT_HASHSIG_SMART_WHITESPACE;
}
return 0;
}
static int merge_index_insert_reuc(
git_index *index,
size_t idx,
const git_index_entry *entry)
{
const git_index_reuc_entry *reuc;
int mode[3] = { 0, 0, 0 };
git_oid const *oid[3] = { NULL, NULL, NULL };
size_t i;
if (!GIT_MERGE_INDEX_ENTRY_EXISTS(*entry))
return 0;
if ((reuc = git_index_reuc_get_bypath(index, entry->path)) != NULL) {
for (i = 0; i < 3; i++) {
mode[i] = reuc->mode[i];
oid[i] = &reuc->oid[i];
}
}
mode[idx] = entry->mode;
oid[idx] = &entry->oid;
return git_index_reuc_add(index, entry->path,
mode[0], oid[0], mode[1], oid[1], mode[2], oid[2]);
}
int index_from_diff_list(git_index **out, git_merge_diff_list *diff_list)
{
git_index *index;
size_t i;
git_index_entry *entry;
git_merge_diff *conflict;
int error = 0;
*out = NULL;
if ((error = git_index_new(&index)) < 0)
return error;
git_vector_foreach(&diff_list->staged, i, entry) {
if ((error = git_index_add(index, entry)) < 0)
goto on_error;
}
git_vector_foreach(&diff_list->conflicts, i, conflict) {
const git_index_entry *ancestor =
GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->ancestor_entry) ?
&conflict->ancestor_entry : NULL;
const git_index_entry *ours =
GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->our_entry) ?
&conflict->our_entry : NULL;
const git_index_entry *theirs =
GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->their_entry) ?
&conflict->their_entry : NULL;
if ((error = git_index_conflict_add(index, ancestor, ours, theirs)) < 0)
goto on_error;
}
/* Add each rename entry to the rename portion of the index. */
git_vector_foreach(&diff_list->conflicts, i, conflict) {
const char *ancestor_path, *our_path, *their_path;
if (!GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->ancestor_entry))
continue;
ancestor_path = conflict->ancestor_entry.path;
our_path =
GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->our_entry) ?
conflict->our_entry.path : NULL;
their_path =
GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->their_entry) ?
conflict->their_entry.path : NULL;
if ((our_path && strcmp(ancestor_path, our_path) != 0) ||
(their_path && strcmp(ancestor_path, their_path) != 0)) {
if ((error = git_index_name_add(index, ancestor_path, our_path, their_path)) < 0)
goto on_error;
}
}
/* Add each entry in the resolved conflict to the REUC independently, since
* the paths may differ due to renames. */
git_vector_foreach(&diff_list->resolved, i, conflict) {
const git_index_entry *ancestor =
GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->ancestor_entry) ?
&conflict->ancestor_entry : NULL;
const git_index_entry *ours =
GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->our_entry) ?
&conflict->our_entry : NULL;
const git_index_entry *theirs =
GIT_MERGE_INDEX_ENTRY_EXISTS(conflict->their_entry) ?
&conflict->their_entry : NULL;
if (ancestor != NULL &&
(error = merge_index_insert_reuc(index, TREE_IDX_ANCESTOR, ancestor)) < 0)
goto on_error;
if (ours != NULL &&
(error = merge_index_insert_reuc(index, TREE_IDX_OURS, ours)) < 0)
goto on_error;
if (theirs != NULL &&
(error = merge_index_insert_reuc(index, TREE_IDX_THEIRS, theirs)) < 0)
goto on_error;
}
*out = index;
return 0;
on_error:
git_index_free(index);
return error;
}
int git_merge_trees(
git_index **out,
git_repository *repo,
const git_tree *ancestor_tree,
const git_tree *our_tree,
const git_tree *their_tree,
const git_merge_tree_opts *given_opts)
{
git_merge_diff_list *diff_list;
git_merge_tree_opts opts;
git_merge_diff *conflict;
git_vector changes;
size_t i;
int error = 0;
assert(out && repo && our_tree && their_tree);
*out = NULL;
if ((error = merge_tree_normalize_opts(repo, &opts, given_opts)) < 0)
return error;
diff_list = git_merge_diff_list__alloc(repo);
GITERR_CHECK_ALLOC(diff_list);
if ((error = git_merge_diff_list__find_differences(diff_list, ancestor_tree, our_tree, their_tree)) < 0 ||
(error = git_merge_diff_list__find_renames(repo, diff_list, &opts)) < 0)
goto done;
memcpy(&changes, &diff_list->conflicts, sizeof(git_vector));
git_vector_clear(&diff_list->conflicts);
git_vector_foreach(&changes, i, conflict) {
int resolved = 0;
if ((error = merge_conflict_resolve(&resolved, diff_list, conflict, opts.automerge_flags)) < 0)
goto done;
if (!resolved)
git_vector_insert(&diff_list->conflicts, conflict);
}
if (!given_opts || !given_opts->metric)
git__free(opts.metric);
error = index_from_diff_list(out, diff_list);
done:
git_merge_diff_list__free(diff_list);
return error;
}
/* Merge setup / cleanup */
static int write_orig_head(
git_repository *repo,
const git_merge_head *our_head)
{
git_filebuf file = GIT_FILEBUF_INIT;
git_buf file_path = GIT_BUF_INIT;
int error = 0;
assert(repo && our_head);
if ((error = git_buf_joinpath(&file_path, repo->path_repository, GIT_ORIG_HEAD_FILE)) == 0 &&
(error = git_filebuf_open(&file, file_path.ptr, GIT_FILEBUF_FORCE, GIT_MERGE_FILE_MODE)) == 0 &&
(error = git_filebuf_printf(&file, "%s\n", our_head->oid_str)) == 0)
error = git_filebuf_commit(&file);
if (error < 0)
git_filebuf_cleanup(&file);
git_buf_free(&file_path);
return error;
}
static int write_merge_head(
git_repository *repo,
const git_merge_head *heads[],
size_t heads_len)
{
git_filebuf file = GIT_FILEBUF_INIT;
git_buf file_path = GIT_BUF_INIT;
size_t i;
int error = 0;
assert(repo && heads);
if ((error = git_buf_joinpath(&file_path, repo->path_repository, GIT_MERGE_HEAD_FILE)) < 0 ||
(error = git_filebuf_open(&file, file_path.ptr, GIT_FILEBUF_FORCE, GIT_MERGE_FILE_MODE)) < 0)
goto cleanup;
for (i = 0; i < heads_len; i++) {
if ((error = git_filebuf_printf(&file, "%s\n", heads[i]->oid_str)) < 0)
goto cleanup;
}
error = git_filebuf_commit(&file);
cleanup:
if (error < 0)
git_filebuf_cleanup(&file);
git_buf_free(&file_path);
return error;
}
static int write_merge_mode(git_repository *repo, unsigned int flags)
{
git_filebuf file = GIT_FILEBUF_INIT;
git_buf file_path = GIT_BUF_INIT;
int error = 0;
/* For future expansion */
GIT_UNUSED(flags);
assert(repo);
if ((error = git_buf_joinpath(&file_path, repo->path_repository, GIT_MERGE_MODE_FILE)) < 0 ||
(error = git_filebuf_open(&file, file_path.ptr, GIT_FILEBUF_FORCE, GIT_MERGE_FILE_MODE)) < 0)
goto cleanup;
/*
* no-ff is the only thing allowed here at present. One would
* presume they would be space-delimited when there are more, but
* this needs to be revisited.
*/
if (flags & GIT_MERGE_NO_FASTFORWARD) {
if ((error = git_filebuf_write(&file, "no-ff", 5)) < 0)
goto cleanup;
}
error = git_filebuf_commit(&file);
cleanup:
if (error < 0)
git_filebuf_cleanup(&file);
git_buf_free(&file_path);
return error;
}
struct merge_msg_entry {
const git_merge_head *merge_head;
bool written;
};
static int msg_entry_is_branch(
const struct merge_msg_entry *entry,
git_vector *entries)
{
GIT_UNUSED(entries);
return (entry->written == 0 &&
entry->merge_head->remote_url == NULL &&
entry->merge_head->ref_name != NULL &&
git__strncmp(GIT_REFS_HEADS_DIR, entry->merge_head->ref_name, strlen(GIT_REFS_HEADS_DIR)) == 0);
}
static int msg_entry_is_tracking(
const struct merge_msg_entry *entry,
git_vector *entries)
{
GIT_UNUSED(entries);
return (entry->written == 0 &&
entry->merge_head->remote_url == NULL &&
entry->merge_head->ref_name != NULL &&
git__strncmp(GIT_REFS_REMOTES_DIR, entry->merge_head->ref_name, strlen(GIT_REFS_REMOTES_DIR)) == 0);
}
static int msg_entry_is_tag(
const struct merge_msg_entry *entry,
git_vector *entries)
{
GIT_UNUSED(entries);
return (entry->written == 0 &&
entry->merge_head->remote_url == NULL &&
entry->merge_head->ref_name != NULL &&
git__strncmp(GIT_REFS_TAGS_DIR, entry->merge_head->ref_name, strlen(GIT_REFS_TAGS_DIR)) == 0);
}
static int msg_entry_is_remote(
const struct merge_msg_entry *entry,
git_vector *entries)
{
if (entry->written == 0 &&
entry->merge_head->remote_url != NULL &&
entry->merge_head->ref_name != NULL &&
git__strncmp(GIT_REFS_HEADS_DIR, entry->merge_head->ref_name, strlen(GIT_REFS_HEADS_DIR)) == 0)
{
struct merge_msg_entry *existing;
/* Match only branches from the same remote */
if (entries->length == 0)
return 1;
existing = git_vector_get(entries, 0);
return (git__strcmp(existing->merge_head->remote_url,
entry->merge_head->remote_url) == 0);
}
return 0;
}
static int msg_entry_is_oid(
const struct merge_msg_entry *merge_msg_entry)
{
return (merge_msg_entry->written == 0 &&
merge_msg_entry->merge_head->ref_name == NULL &&
merge_msg_entry->merge_head->remote_url == NULL);
}
static int merge_msg_entry_written(
const struct merge_msg_entry *merge_msg_entry)
{
return (merge_msg_entry->written == 1);
}
static int merge_msg_entries(
git_vector *v,
const struct merge_msg_entry *entries,
size_t len,
int (*match)(const struct merge_msg_entry *entry, git_vector *entries))
{
size_t i;
int matches, total = 0;
git_vector_clear(v);
for (i = 0; i < len; i++) {
if ((matches = match(&entries[i], v)) < 0)
return matches;
else if (!matches)
continue;
git_vector_insert(v, (struct merge_msg_entry *)&entries[i]);
total++;
}
return total;
}
static int merge_msg_write_entries(
git_filebuf *file,
git_vector *entries,
const char *item_name,
const char *item_plural_name,
size_t ref_name_skip,
const char *source,
char sep)
{
struct merge_msg_entry *entry;
size_t i;
int error = 0;
if (entries->length == 0)
return 0;
if (sep && (error = git_filebuf_printf(file, "%c ", sep)) < 0)
goto done;
if ((error = git_filebuf_printf(file, "%s ",
(entries->length == 1) ? item_name : item_plural_name)) < 0)
goto done;
git_vector_foreach(entries, i, entry) {
if (i > 0 &&
(error = git_filebuf_printf(file, "%s", (i == entries->length - 1) ? " and " : ", ")) < 0)
goto done;
if ((error = git_filebuf_printf(file, "'%s'", entry->merge_head->ref_name + ref_name_skip)) < 0)
goto done;
entry->written = 1;
}
if (source)
error = git_filebuf_printf(file, " of %s", source);
done:
return error;
}
static int merge_msg_write_branches(
git_filebuf *file,
git_vector *entries,
char sep)
{
return merge_msg_write_entries(file, entries,
"branch", "branches", strlen(GIT_REFS_HEADS_DIR), NULL, sep);
}
static int merge_msg_write_tracking(
git_filebuf *file,
git_vector *entries,
char sep)
{
return merge_msg_write_entries(file, entries,
"remote-tracking branch", "remote-tracking branches", 0, NULL, sep);
}
static int merge_msg_write_tags(
git_filebuf *file,
git_vector *entries,
char sep)
{
return merge_msg_write_entries(file, entries,
"tag", "tags", strlen(GIT_REFS_TAGS_DIR), NULL, sep);
}
static int merge_msg_write_remotes(
git_filebuf *file,
git_vector *entries,
char sep)
{
const char *source;
if (entries->length == 0)
return 0;
source = ((struct merge_msg_entry *)entries->contents[0])->merge_head->remote_url;
return merge_msg_write_entries(file, entries,
"branch", "branches", strlen(GIT_REFS_HEADS_DIR), source, sep);
}
static int write_merge_msg(
git_repository *repo,
const git_merge_head *heads[],
size_t heads_len)
{
git_filebuf file = GIT_FILEBUF_INIT;
git_buf file_path = GIT_BUF_INIT;
struct merge_msg_entry *entries;
git_vector matching = GIT_VECTOR_INIT;
size_t i;
char sep = 0;
int error = 0;
assert(repo && heads);
entries = git__calloc(heads_len, sizeof(struct merge_msg_entry));
GITERR_CHECK_ALLOC(entries);
if (git_vector_init(&matching, heads_len, NULL) < 0) {
git__free(entries);
return -1;
}
for (i = 0; i < heads_len; i++)
entries[i].merge_head = heads[i];
if ((error = git_buf_joinpath(&file_path, repo->path_repository, GIT_MERGE_MSG_FILE)) < 0 ||
(error = git_filebuf_open(&file, file_path.ptr, GIT_FILEBUF_FORCE, GIT_MERGE_FILE_MODE)) < 0 ||
(error = git_filebuf_write(&file, "Merge ", 6)) < 0)
goto cleanup;
/*
* This is to emulate the format of MERGE_MSG by core git.
*
* Core git will write all the commits specified by OID, in the order
* provided, until the first named branch or tag is reached, at which
* point all branches will be written in the order provided, then all
* tags, then all remote tracking branches and finally all commits that
* were specified by OID that were not already written.
*
* Yes. Really.
*/
for (i = 0; i < heads_len; i++) {
if (!msg_entry_is_oid(&entries[i]))
break;
if ((error = git_filebuf_printf(&file,
"%scommit '%s'", (i > 0) ? "; " : "",
entries[i].merge_head->oid_str)) < 0)
goto cleanup;
entries[i].written = 1;
}
if (i)
sep = ';';
if ((error = merge_msg_entries(&matching, entries, heads_len, msg_entry_is_branch)) < 0 ||
(error = merge_msg_write_branches(&file, &matching, sep)) < 0)
goto cleanup;
if (matching.length)
sep =',';
if ((error = merge_msg_entries(&matching, entries, heads_len, msg_entry_is_tracking)) < 0 ||
(error = merge_msg_write_tracking(&file, &matching, sep)) < 0)
goto cleanup;
if (matching.length)
sep =',';
if ((error = merge_msg_entries(&matching, entries, heads_len, msg_entry_is_tag)) < 0 ||
(error = merge_msg_write_tags(&file, &matching, sep)) < 0)
goto cleanup;
if (matching.length)
sep =',';
/* We should never be called with multiple remote branches, but handle
* it in case we are... */
while ((error = merge_msg_entries(&matching, entries, heads_len, msg_entry_is_remote)) > 0) {
if ((error = merge_msg_write_remotes(&file, &matching, sep)) < 0)
goto cleanup;
if (matching.length)
sep =',';
}
if (error < 0)
goto cleanup;
for (i = 0; i < heads_len; i++) {
if (merge_msg_entry_written(&entries[i]))
continue;
if ((error = git_filebuf_printf(&file, "; commit '%s'",
entries[i].merge_head->oid_str)) < 0)
goto cleanup;
}
if ((error = git_filebuf_printf(&file, "\n")) < 0 ||
(error = git_filebuf_commit(&file)) < 0)
goto cleanup;
cleanup:
if (error < 0)
git_filebuf_cleanup(&file);
git_buf_free(&file_path);
git_vector_free(&matching);
git__free(entries);
return error;
}
/* Merge branches */
static int merge_ancestor_head(
git_merge_head **ancestor_head,
git_repository *repo,
const git_merge_head *our_head,
const git_merge_head **their_heads,
size_t their_heads_len)
{
git_oid *oids, ancestor_oid;
size_t i;
int error = 0;
assert(repo && our_head && their_heads);
oids = git__calloc(their_heads_len + 1, sizeof(git_oid));
GITERR_CHECK_ALLOC(oids);
git_oid_cpy(&oids[0], git_commit_id(our_head->commit));
for (i = 0; i < their_heads_len; i++)
git_oid_cpy(&oids[i + 1], &their_heads[i]->oid);
if ((error = git_merge_base_many(&ancestor_oid, repo, their_heads_len + 1, oids)) < 0)
goto on_error;
error = git_merge_head_from_oid(ancestor_head, repo, &ancestor_oid);
on_error:
git__free(oids);
return error;
}
GIT_INLINE(bool) merge_check_uptodate(
git_merge_result *result,
const git_merge_head *ancestor_head,
const git_merge_head *their_head)
{
if (git_oid_cmp(&ancestor_head->oid, &their_head->oid) == 0) {
result->is_uptodate = 1;
return true;
}
return false;
}
GIT_INLINE(bool) merge_check_fastforward(
git_merge_result *result,
const git_merge_head *ancestor_head,
const git_merge_head *our_head,
const git_merge_head *their_head,
unsigned int flags)
{
if ((flags & GIT_MERGE_NO_FASTFORWARD) == 0 &&
git_oid_cmp(&ancestor_head->oid, &our_head->oid) == 0) {
result->is_fastforward = 1;
git_oid_cpy(&result->fastforward_oid, &their_head->oid);
return true;
}
return false;
}
const char *merge_their_label(const char *branchname)
{
const char *slash;
if ((slash = strrchr(branchname, '/')) == NULL)
return branchname;
if (*(slash+1) == '\0')
return "theirs";
return slash+1;
}
static int merge_normalize_opts(
git_repository *repo,
git_merge_opts *opts,
const git_merge_opts *given,
size_t their_heads_len,
const git_merge_head **their_heads)
{
int error = 0;
unsigned int default_checkout_strategy = GIT_CHECKOUT_SAFE_CREATE |
GIT_CHECKOUT_ALLOW_CONFLICTS;
GIT_UNUSED(repo);
if (given != NULL)
memcpy(opts, given, sizeof(git_merge_opts));
else {
git_merge_opts default_opts = GIT_MERGE_OPTS_INIT;
memcpy(opts, &default_opts, sizeof(git_merge_opts));
}
if (!opts->checkout_opts.checkout_strategy)
opts->checkout_opts.checkout_strategy = default_checkout_strategy;
if (!opts->checkout_opts.our_label)
opts->checkout_opts.our_label = "HEAD";
if (!opts->checkout_opts.their_label) {
if (their_heads_len == 1 && their_heads[0]->ref_name)
opts->checkout_opts.their_label = merge_their_label(their_heads[0]->ref_name);
else if (their_heads_len == 1)
opts->checkout_opts.their_label = their_heads[0]->oid_str;
else
opts->checkout_opts.their_label = "theirs";
}
return error;
}
static int merge_affected_paths(git_vector *paths, git_repository *repo, git_index *index_new)
{
git_tree *head_tree = NULL;
git_iterator *iter_head = NULL, *iter_new = NULL;
git_diff *merged_list = NULL;
git_diff_options opts = GIT_DIFF_OPTIONS_INIT;
git_diff_delta *delta;
size_t i;
const git_index_entry *e;
char *path;
int error = 0;
if ((error = git_repository_head_tree(&head_tree, repo)) < 0 ||
(error = git_iterator_for_tree(&iter_head, head_tree, GIT_ITERATOR_DONT_IGNORE_CASE, NULL, NULL)) < 0 ||
(error = git_iterator_for_index(&iter_new, index_new, GIT_ITERATOR_DONT_IGNORE_CASE, NULL, NULL)) < 0 ||
(error = git_diff__from_iterators(&merged_list, repo, iter_head, iter_new, &opts)) < 0)
goto done;
git_vector_foreach(&merged_list->deltas, i, delta) {
path = git__strdup(delta->new_file.path);
GITERR_CHECK_ALLOC(path);
if ((error = git_vector_insert(paths, path)) < 0)
goto on_error;
}
for (i = 0; i < git_index_entrycount(index_new); i++) {
e = git_index_get_byindex(index_new, i);
if (git_index_entry_stage(e) != 0 &&
(git_vector_last(paths) == NULL ||
strcmp(git_vector_last(paths), e->path) != 0)) {
path = git__strdup(e->path);
GITERR_CHECK_ALLOC(path);
if ((error = git_vector_insert(paths, path)) < 0)
goto on_error;
}
}
goto done;
on_error:
git_vector_foreach(paths, i, path)
git__free(path);
git_vector_clear(paths);
done:
git_tree_free(head_tree);
git_iterator_free(iter_head);
git_iterator_free(iter_new);
git_diff_free(merged_list);
return error;
}
static int merge_check_index(size_t *conflicts, git_repository *repo, git_index *index_new, git_vector *merged_paths)
{
git_tree *head_tree = NULL;
git_index *index_repo = NULL;
git_iterator *iter_repo = NULL, *iter_new = NULL;
git_diff *staged_diff_list = NULL, *index_diff_list = NULL;
git_diff_delta *delta;
git_diff_options opts = GIT_DIFF_OPTIONS_INIT;
git_vector staged_paths = GIT_VECTOR_INIT;
size_t i;
int error = 0;
GIT_UNUSED(merged_paths);
*conflicts = 0;
/* No staged changes may exist unless the change staged is identical to
* the result of the merge. This allows one to apply to merge manually,
* then run merge. Any other staged change would be overwritten by
* a reset merge.
*/
if ((error = git_repository_head_tree(&head_tree, repo)) < 0 ||
(error = git_repository_index(&index_repo, repo)) < 0 ||
(error = git_diff_tree_to_index(&staged_diff_list, repo, head_tree, index_repo, &opts)) < 0)
goto done;
if (staged_diff_list->deltas.length == 0)
goto done;
git_vector_foreach(&staged_diff_list->deltas, i, delta) {
if ((error = git_vector_insert(&staged_paths, (char *)delta->new_file.path)) < 0)
goto done;
}
opts.pathspec.count = staged_paths.length;
opts.pathspec.strings = (char **)staged_paths.contents;
if ((error = git_iterator_for_index(&iter_repo, index_repo, GIT_ITERATOR_DONT_IGNORE_CASE, NULL, NULL)) < 0 ||
(error = git_iterator_for_index(&iter_new, index_new, GIT_ITERATOR_DONT_IGNORE_CASE, NULL, NULL)) < 0 ||
(error = git_diff__from_iterators(&index_diff_list, repo, iter_repo, iter_new, &opts)) < 0)
goto done;
*conflicts = index_diff_list->deltas.length;
done:
git_tree_free(head_tree);
git_index_free(index_repo);
git_iterator_free(iter_repo);
git_iterator_free(iter_new);
git_diff_free(staged_diff_list);
git_diff_free(index_diff_list);
git_vector_free(&staged_paths);
return error;
}
static int merge_check_workdir(size_t *conflicts, git_repository *repo, git_index *index_new, git_vector *merged_paths)
{
git_tree *head_tree = NULL;
git_diff *wd_diff_list = NULL;
git_diff_options opts = GIT_DIFF_OPTIONS_INIT;
int error = 0;
GIT_UNUSED(index_new);
*conflicts = 0;
opts.flags |= GIT_DIFF_INCLUDE_UNTRACKED;
if ((error = git_repository_head_tree(&head_tree, repo)) < 0)
goto done;
/* Workdir changes may exist iff they do not conflict with changes that
* will be applied by the merge (including conflicts). Ensure that there
* are no changes in the workdir to these paths.
*/
opts.pathspec.count = merged_paths->length;
opts.pathspec.strings = (char **)merged_paths->contents;
if ((error = git_diff_tree_to_workdir(&wd_diff_list, repo, head_tree, &opts)) < 0)
goto done;
*conflicts = wd_diff_list->deltas.length;
done:
git_tree_free(head_tree);
git_diff_free(wd_diff_list);
return error;
}
static int merge_indexes(git_repository *repo, git_index *index_new)
{
git_index *index_repo;
unsigned int index_repo_caps;
git_vector paths = GIT_VECTOR_INIT;
size_t index_conflicts = 0, wd_conflicts = 0, conflicts, i;
char *path;
const git_index_entry *e;
const git_index_name_entry *name;
const git_index_reuc_entry *reuc;
int error = 0;
if ((error = git_repository_index(&index_repo, repo)) < 0)
goto done;
/* Set the index to case sensitive to handle the merge */
index_repo_caps = git_index_caps(index_repo);
if ((error = git_index_set_caps(index_repo, (index_repo_caps & ~GIT_INDEXCAP_IGNORE_CASE))) < 0)
goto done;
/* Make sure the index and workdir state do not prevent merging */
if ((error = merge_affected_paths(&paths, repo, index_new)) < 0 ||
(error = merge_check_index(&index_conflicts, repo, index_new, &paths)) < 0 ||
(error = merge_check_workdir(&wd_conflicts, repo, index_new, &paths)) < 0)
goto done;
if ((conflicts = index_conflicts + wd_conflicts) > 0) {
giterr_set(GITERR_MERGE, "%d uncommitted change%s would be overwritten by merge",
conflicts, (conflicts != 1) ? "s" : "");
error = GIT_EMERGECONFLICT;
goto done;
}
/* Update the new index */
git_vector_foreach(&paths, i, path) {
if ((e = git_index_get_bypath(index_new, path, 0)) != NULL)
error = git_index_add(index_repo, e);
else
error = git_index_remove(index_repo, path, 0);
}
/* Add conflicts */
git_index_conflict_cleanup(index_repo);
for (i = 0; i < git_index_entrycount(index_new); i++) {
e = git_index_get_byindex(index_new, i);
if (git_index_entry_stage(e) != 0 &&
(error = git_index_add(index_repo, e)) < 0)
goto done;
}
/* Add name entries */
git_index_name_clear(index_repo);
for (i = 0; i < git_index_name_entrycount(index_new); i++) {
name = git_index_name_get_byindex(index_new, i);
if ((error = git_index_name_add(index_repo,
name->ancestor, name->ours, name->theirs)) < 0)
goto done;
}
/* Add the reuc */
git_index_reuc_clear(index_repo);
for (i = 0; i < git_index_reuc_entrycount(index_new); i++) {
reuc = (git_index_reuc_entry *)git_index_reuc_get_byindex(index_new, i);
if ((error = git_index_reuc_add(index_repo, reuc->path,
reuc->mode[0], &reuc->oid[0],
reuc->mode[1], &reuc->oid[1],
reuc->mode[2], &reuc->oid[2])) < 0)
goto done;
}
done:
if (index_repo != NULL)
git_index_set_caps(index_repo, index_repo_caps);
git_index_free(index_repo);
git_vector_foreach(&paths, i, path)
git__free(path);
git_vector_free(&paths);
return error;
}
int git_merge(
git_merge_result **out,
git_repository *repo,
const git_merge_head **their_heads,
size_t their_heads_len,
const git_merge_opts *given_opts)
{
git_merge_result *result;
git_merge_opts opts;
git_reference *our_ref = NULL;
git_merge_head *ancestor_head = NULL, *our_head = NULL;
git_tree *ancestor_tree = NULL, *our_tree = NULL, **their_trees = NULL;
git_index *index_new = NULL, *index_repo = NULL;
size_t i;
int error = 0;
assert(out && repo && their_heads);
*out = NULL;
if (their_heads_len != 1) {
giterr_set(GITERR_MERGE, "Can only merge a single branch");
return -1;
}
result = git__calloc(1, sizeof(git_merge_result));
GITERR_CHECK_ALLOC(result);
their_trees = git__calloc(their_heads_len, sizeof(git_tree *));
GITERR_CHECK_ALLOC(their_trees);
if ((error = merge_normalize_opts(repo, &opts, given_opts, their_heads_len, their_heads)) < 0)
goto on_error;
if ((error = git_repository__ensure_not_bare(repo, "merge")) < 0)
goto on_error;
if ((error = git_reference_lookup(&our_ref, repo, GIT_HEAD_FILE)) < 0 ||
(error = git_merge_head_from_ref(&our_head, repo, our_ref)) < 0)
goto on_error;
if ((error = merge_ancestor_head(&ancestor_head, repo, our_head, their_heads, their_heads_len)) < 0 &&
error != GIT_ENOTFOUND)
goto on_error;
if (their_heads_len == 1 &&
ancestor_head != NULL &&
(merge_check_uptodate(result, ancestor_head, their_heads[0]) ||
merge_check_fastforward(result, ancestor_head, our_head, their_heads[0], opts.merge_flags))) {
*out = result;
goto done;
}
/* If FASTFORWARD_ONLY is specified, fail. */
if ((opts.merge_flags & GIT_MERGE_FASTFORWARD_ONLY) ==
GIT_MERGE_FASTFORWARD_ONLY) {
giterr_set(GITERR_MERGE, "Not a fast-forward.");
error = GIT_ENONFASTFORWARD;
goto on_error;
}
/* Write the merge files to the repository. */
if ((error = git_merge__setup(repo, our_head, their_heads, their_heads_len, opts.merge_flags)) < 0)
goto on_error;
if (ancestor_head != NULL &&
(error = git_commit_tree(&ancestor_tree, ancestor_head->commit)) < 0)
goto on_error;
if ((error = git_commit_tree(&our_tree, our_head->commit)) < 0)
goto on_error;
for (i = 0; i < their_heads_len; i++) {
if ((error = git_commit_tree(&their_trees[i], their_heads[i]->commit)) < 0)
goto on_error;
}
/* TODO: recursive, octopus, etc... */
if ((error = git_merge_trees(&index_new, repo, ancestor_tree, our_tree, their_trees[0], &opts.merge_tree_opts)) < 0 ||
(error = merge_indexes(repo, index_new)) < 0 ||
(error = git_repository_index(&index_repo, repo)) < 0 ||
(error = git_checkout_index(repo, index_repo, &opts.checkout_opts)) < 0)
goto on_error;
result->index = index_new;
*out = result;
goto done;
on_error:
git_repository_merge_cleanup(repo);
git_index_free(index_new);
git__free(result);
done:
git_index_free(index_repo);
git_tree_free(ancestor_tree);
git_tree_free(our_tree);
for (i = 0; i < their_heads_len; i++)
git_tree_free(their_trees[i]);
git__free(their_trees);
git_merge_head_free(our_head);
git_merge_head_free(ancestor_head);
git_reference_free(our_ref);
return error;
}
int git_merge__setup(
git_repository *repo,
const git_merge_head *our_head,
const git_merge_head *heads[],
size_t heads_len,
unsigned int flags)
{
int error = 0;
assert (repo && our_head && heads);
if ((error = write_orig_head(repo, our_head)) == 0 &&
(error = write_merge_head(repo, heads, heads_len)) == 0 &&
(error = write_merge_mode(repo, flags)) == 0) {
error = write_merge_msg(repo, heads, heads_len);
}
return error;
}
int git_repository_merge_cleanup(git_repository *repo)
{
int error = 0;
git_buf merge_head_path = GIT_BUF_INIT,
merge_mode_path = GIT_BUF_INIT,
merge_msg_path = GIT_BUF_INIT;
assert(repo);
if (git_buf_joinpath(&merge_head_path, repo->path_repository, GIT_MERGE_HEAD_FILE) < 0 ||
git_buf_joinpath(&merge_mode_path, repo->path_repository, GIT_MERGE_MODE_FILE) < 0 ||
git_buf_joinpath(&merge_msg_path, repo->path_repository, GIT_MERGE_MSG_FILE) < 0)
return -1;
if (git_path_isfile(merge_head_path.ptr)) {
if ((error = p_unlink(merge_head_path.ptr)) < 0)
goto cleanup;
}
if (git_path_isfile(merge_mode_path.ptr))
(void)p_unlink(merge_mode_path.ptr);
if (git_path_isfile(merge_msg_path.ptr))
(void)p_unlink(merge_msg_path.ptr);
cleanup:
git_buf_free(&merge_msg_path);
git_buf_free(&merge_mode_path);
git_buf_free(&merge_head_path);
return error;
}
/* Merge result data */
int git_merge_result_is_uptodate(git_merge_result *merge_result)
{
assert(merge_result);
return merge_result->is_uptodate;
}
int git_merge_result_is_fastforward(git_merge_result *merge_result)
{
assert(merge_result);
return merge_result->is_fastforward;
}
int git_merge_result_fastforward_oid(git_oid *out, git_merge_result *merge_result)
{
assert(out && merge_result);
git_oid_cpy(out, &merge_result->fastforward_oid);
return 0;
}
void git_merge_result_free(git_merge_result *merge_result)
{
if (merge_result == NULL)
return;
git_index_free(merge_result->index);
merge_result->index = NULL;
git__free(merge_result);
}
/* Merge heads are the input to merge */
static int merge_head_init(
git_merge_head **out,
git_repository *repo,
const char *ref_name,
const char *remote_url,
const git_oid *oid)
{
git_merge_head *head;
int error = 0;
assert(out && oid);
*out = NULL;
head = git__calloc(1, sizeof(git_merge_head));
GITERR_CHECK_ALLOC(head);
if (ref_name) {
head->ref_name = git__strdup(ref_name);
GITERR_CHECK_ALLOC(head->ref_name);
}
if (remote_url) {
head->remote_url = git__strdup(remote_url);
GITERR_CHECK_ALLOC(head->remote_url);
}
git_oid_cpy(&head->oid, oid);
git_oid_fmt(head->oid_str, oid);
head->oid_str[GIT_OID_HEXSZ] = '\0';
if ((error = git_commit_lookup(&head->commit, repo, &head->oid)) < 0) {
git_merge_head_free(head);
return error;
}
*out = head;
return error;
}
int git_merge_head_from_ref(
git_merge_head **out,
git_repository *repo,
git_reference *ref)
{
git_reference *resolved;
int error = 0;
assert(out && repo && ref);
*out = NULL;
if ((error = git_reference_resolve(&resolved, ref)) < 0)
return error;
error = merge_head_init(out, repo, git_reference_name(ref), NULL,
git_reference_target(resolved));
git_reference_free(resolved);
return error;
}
int git_merge_head_from_oid(
git_merge_head **out,
git_repository *repo,
const git_oid *oid)
{
assert(out && repo && oid);
return merge_head_init(out, repo, NULL, NULL, oid);
}
int git_merge_head_from_fetchhead(
git_merge_head **out,
git_repository *repo,
const char *branch_name,
const char *remote_url,
const git_oid *oid)
{
assert(repo && branch_name && remote_url && oid);
return merge_head_init(out, repo, branch_name, remote_url, oid);
}
void git_merge_head_free(git_merge_head *head)
{
if (head == NULL)
return;
if (head->commit != NULL)
git_object_free((git_object *)head->commit);
if (head->ref_name != NULL)
git__free(head->ref_name);
if (head->remote_url != NULL)
git__free(head->remote_url);
git__free(head);
}
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