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Introduce git_apply_patch

Browse Source 
The beginnings of patch application from an existing (diff-created)
git_patch object: applies the hunks of a git_patch to a buffer.
This commit is contained in:
Edward Thomson 2014-04-01 23:58:59 -07:00 committed by Edward Thomson
parent 784bb30300
commit 7cb904ba44
8 changed files with 811 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/git2/errors.h
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@ -98,7 +98,8 @@ typedef enum {
GITERR_CHERRYPICK,
GITERR_DESCRIBE,
GITERR_REBASE,
GITERR_FILESYSTEM
GITERR_FILESYSTEM,
GITERR_PATCH,
} git_error_t;
/**

282
src/apply.c Normal file
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@ -0,0 +1,282 @@
/*
* 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 <assert.h>
#include "git2/patch.h"
#include "git2/filter.h"
#include "array.h"
#include "diff_patch.h"
#include "fileops.h"
#include "apply.h"
#define apply_err(...) \
( giterr_set(GITERR_PATCH, __VA_ARGS__), -1 )
typedef struct {
/* The lines that we allocate ourself are allocated out of the pool.
* (Lines may have been allocated out of the diff.)
*/
git_pool pool;
git_vector lines;
} patch_image;
static void patch_line_init(
git_diff_line *out,
const char *in,
size_t in_len,
size_t in_offset)
{
out->content = in;
out->content_len = in_len;
out->content_offset = in_offset;
}
static unsigned int patch_image_init(patch_image *out)
{
memset(out, 0x0, sizeof(patch_image));
return 0;
}
static int patch_image_init_fromstr(
patch_image *out, const char *in, size_t in_len)
{
git_diff_line *line;
const char *start, *end;
memset(out, 0x0, sizeof(patch_image));
git_pool_init(&out->pool, sizeof(git_diff_line));
for (start = in; start < in + in_len; start = end) {
end = memchr(start, '\n', in_len);
if (end < in + in_len)
end++;
line = git_pool_mallocz(&out->pool, 1);
GITERR_CHECK_ALLOC(line);
if (git_vector_insert(&out->lines, line) < 0)
return -1;
patch_line_init(line, start, (end - start), (start - in));
}
return 0;
}
static void patch_image_free(patch_image *image)
{
if (image == NULL)
return;
git_pool_clear(&image->pool);
git_vector_free(&image->lines);
}
static bool match_hunk(
patch_image *image,
patch_image *preimage,
size_t linenum)
{
bool match = 0;
size_t i;
/* Ensure this hunk is within the image boundaries. */
if (git_vector_length(&preimage->lines) + linenum >
git_vector_length(&image->lines))
return 0;
match = 1;
/* Check exact match. */
for (i = 0; i < git_vector_length(&preimage->lines); i++) {
git_diff_line *preimage_line = git_vector_get(&preimage->lines, i);
git_diff_line *image_line = git_vector_get(&image->lines, linenum + i);
if (preimage_line->content_len != preimage_line->content_len ||
memcmp(preimage_line->content, image_line->content, image_line->content_len) != 0) {
match = 0;
break;
}
}
return match;
}
static bool find_hunk_linenum(
size_t *out,
patch_image *image,
patch_image *preimage,
size_t linenum)
{
size_t max = git_vector_length(&image->lines);
bool match;
if (linenum > max)
linenum = max;
match = match_hunk(image, preimage, linenum);
*out = linenum;
return match;
}
static int update_hunk(
patch_image *image,
unsigned int linenum,
patch_image *preimage,
patch_image *postimage)
{
size_t postlen = git_vector_length(&postimage->lines);
size_t prelen = git_vector_length(&preimage->lines);
size_t i;
int error = 0;
if (postlen > prelen)
error = git_vector_grow_at(
&image->lines, linenum, (postlen - prelen));
else if (prelen > postlen)
error = git_vector_shrink_at(
&image->lines, linenum, (prelen - postlen));
if (error) {
giterr_set_oom();
return -1;
}
for (i = 0; i < git_vector_length(&postimage->lines); i++) {
image->lines.contents[linenum + i] =
git_vector_get(&postimage->lines, i);
}
return 0;
}
static int apply_hunk(
patch_image *image,
git_patch *patch,
diff_patch_hunk *hunk)
{
patch_image preimage, postimage;
size_t line_num, i;
int error = 0;
if ((error = patch_image_init(&preimage)) < 0 ||
(error = patch_image_init(&postimage)) < 0)
goto done;
for (i = 0; i < hunk->line_count; i++) {
size_t linenum = hunk->line_start + i;
git_diff_line *line = git_array_get(patch->lines, linenum);
if (!line) {
error = apply_err("Preimage does not contain line %d", linenum);
goto done;
}
if (line->origin == GIT_DIFF_LINE_CONTEXT ||
line->origin == GIT_DIFF_LINE_DELETION) {
if ((error = git_vector_insert(&preimage.lines, line)) < 0)
goto done;
}
if (line->origin == GIT_DIFF_LINE_CONTEXT ||
line->origin == GIT_DIFF_LINE_ADDITION) {
if ((error = git_vector_insert(&postimage.lines, line)) < 0)
goto done;
}
}
line_num = hunk->hunk.new_start ? hunk->hunk.new_start - 1 : 0;
if (!find_hunk_linenum(&line_num, image, &preimage, line_num)) {
error = apply_err("Hunk at line %d did not apply",
hunk->hunk.new_start);
goto done;
}
error = update_hunk(image, line_num, &preimage, &postimage);
done:
patch_image_free(&preimage);
patch_image_free(&postimage);
return error;
}
static int apply_hunks(
git_buf *out,
const char *source,
size_t source_len,
git_patch *patch)
{
diff_patch_hunk *hunk;
git_diff_line *line;
patch_image image;
size_t i;
int error = 0;
if ((error = patch_image_init_fromstr(&image, source, source_len)) < 0)
goto done;
git_array_foreach(patch->hunks, i, hunk) {
if ((error = apply_hunk(&image, patch, hunk)) < 0)
goto done;
}
git_vector_foreach(&image.lines, i, line)
git_buf_put(out, line->content, line->content_len);
done:
patch_image_free(&image);
return error;
}
int git_apply__patch(
git_buf *contents_out,
char **filename_out,
unsigned int *mode_out,
const char *source,
size_t source_len,
git_patch *patch)
{
char *filename = NULL;
unsigned int mode = 0;
int error = 0;
assert(contents_out && filename_out && mode_out && (source || !source_len) && patch);
*filename_out = NULL;
*mode_out = 0;
if (patch->delta->status != GIT_DELTA_DELETED) {
filename = git__strdup(patch->nfile.file->path);
mode = patch->nfile.file->mode ?
patch->nfile.file->mode : GIT_FILEMODE_BLOB;
}
if ((error = apply_hunks(contents_out, source, source_len, patch)) < 0)
goto done;
if (patch->delta->status == GIT_DELTA_DELETED &&
git_buf_len(contents_out) > 0) {
error = apply_err("removal patch leaves file contents");
goto done;
}
*filename_out = filename;
*mode_out = mode;
done:
if (error < 0)
git__free(filename);
return error;
}

21
src/apply.h Normal file
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@ -0,0 +1,21 @@
/*
* 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.
*/
#ifndef INCLUDE_apply_h__
#define INCLUDE_apply_h__
#include "git2/patch.h"
#include "buffer.h"
extern int git_apply__patch(
git_buf *out,
char **filename,
unsigned int *mode,
const char *source,
size_t source_len,
git_patch *patch);
#endif

1
src/array.h
View File

@ -85,7 +85,6 @@ on_oom:
#define git_array_foreach(a, i, element) \
for ((i) = 0; (i) < (a).size && ((element) = &(a).ptr[(i)]); (i)++)
GIT_INLINE(int) git_array__search(
size_t *out,
void *array_ptr,

41
src/vector.c
View File

@ -330,6 +330,47 @@ int git_vector_resize_to(git_vector *v, size_t new_length)
return 0;
}
int git_vector_grow_at(git_vector *v, size_t idx, size_t grow_len)
{
size_t new_length = v->length + grow_len;
size_t new_idx = idx + grow_len;
assert(grow_len > 0);
assert (idx <= v->length);
if (new_length < v->length ||
(new_length > v->_alloc_size && resize_vector(v, new_length) < 0))
return -1;
memmove(&v->contents[new_idx], &v->contents[idx],
sizeof(void *) * (v->length - idx));
memset(&v->contents[idx], 0, sizeof(void *) * grow_len);
v->length = new_length;
return 0;
}
int git_vector_shrink_at(git_vector *v, size_t idx, size_t shrink_len)
{
size_t new_length = v->length - shrink_len;
size_t end_idx = idx + shrink_len;
assert(shrink_len > 0 && shrink_len <= v->length);
assert(idx <= v->length);
if (new_length > v->length)
return -1;
if (idx > v->length)
memmove(&v->contents[idx], &v->contents[end_idx],
sizeof(void *) * (v->length - idx));
memset(&v->contents[new_length], 0, sizeof(void *) * shrink_len);
v->length = new_length;
return 0;
}
int git_vector_set(void **old, git_vector *v, size_t position, void *value)
{
if (position + 1 > v->length) {

3
src/vector.h
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@ -93,6 +93,9 @@ void git_vector_remove_matching(
void *payload);
int git_vector_resize_to(git_vector *v, size_t new_length);
int git_vector_grow_at(git_vector *v, size_t idx, size_t grow_len);
int git_vector_shrink_at(git_vector *v, size_t idx, size_t shrink_len);
int git_vector_set(void **old, git_vector *v, size_t position, void *value);
/** Check if vector is sorted */

286
tests/apply/apply_common.h Normal file
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@ -0,0 +1,286 @@
/* The original file contents */
#define FILE_ORIGINAL \
"hey!\n" \
"this is some context!\n" \
"around some lines\n" \
"that will change\n" \
"yes it is!\n" \
"(this line is changed)\n" \
"and this\n" \
"is additional context\n" \
"below it!\n"
/* A change in the middle of the file (and the resultant patch) */
#define FILE_CHANGE_MIDDLE \
"hey!\n" \
"this is some context!\n" \
"around some lines\n" \
"that will change\n" \
"yes it is!\n" \
"(THIS line is changed!)\n" \
"and this\n" \
"is additional context\n" \
"below it!\n"
#define PATCH_ORIGINAL_TO_CHANGE_MIDDLE \
"diff --git a/file.txt b/file.txt\n" \
"index 9432026..cd8fd12 100644\n" \
"--- a/file.txt\n" \
"+++ b/file.txt\n" \
"@@ -3,7 +3,7 @@ this is some context!\n" \
" around some lines\n" \
" that will change\n" \
" yes it is!\n" \
"-(this line is changed)\n" \
"+(THIS line is changed!)\n" \
" and this\n" \
" is additional context\n" \
" below it!\n"
#define PATCH_ORIGINAL_TO_CHANGE_MIDDLE_NOCONTEXT \
"diff --git a/file.txt b/file.txt\n" \
"index 9432026..cd8fd12 100644\n" \
"--- a/file.txt\n" \
"+++ b/file.txt\n" \
"@@ -6 +6 @@ yes it is!\n" \
"-(this line is changed)\n" \
"+(THIS line is changed!)\n"
/* A change of the first line (and the resultant patch) */
#define FILE_CHANGE_FIRSTLINE \
"hey, change in head!\n" \
"this is some context!\n" \
"around some lines\n" \
"that will change\n" \
"yes it is!\n" \
"(this line is changed)\n" \
"and this\n" \
"is additional context\n" \
"below it!\n"
#define PATCH_ORIGINAL_TO_CHANGE_FIRSTLINE \
"diff --git a/file.txt b/file.txt\n" \
"index 9432026..c81df1d 100644\n" \
"--- a/file.txt\n" \
"+++ b/file.txt\n" \
"@@ -1,4 +1,4 @@\n" \
"-hey!\n" \
"+hey, change in head!\n" \
" this is some context!\n" \
" around some lines\n" \
" that will change\n"
/* A change of the last line (and the resultant patch) */
#define FILE_CHANGE_LASTLINE \
"hey!\n" \
"this is some context!\n" \
"around some lines\n" \
"that will change\n" \
"yes it is!\n" \
"(this line is changed)\n" \
"and this\n" \
"is additional context\n" \
"change to the last line.\n"
#define PATCH_ORIGINAL_TO_CHANGE_LASTLINE \
"diff --git a/file.txt b/file.txt\n" \
"index 9432026..f70db1c 100644\n" \
"--- a/file.txt\n" \
"+++ b/file.txt\n" \
"@@ -6,4 +6,4 @@ yes it is!\n" \
" (this line is changed)\n" \
" and this\n" \
" is additional context\n" \
"-below it!\n" \
"+change to the last line.\n"
/* An insertion at the beginning of the file (and the resultant patch) */
#define FILE_PREPEND \
"insert at front\n" \
"hey!\n" \
"this is some context!\n" \
"around some lines\n" \
"that will change\n" \
"yes it is!\n" \
"(this line is changed)\n" \
"and this\n" \
"is additional context\n" \
"below it!\n"
#define PATCH_ORIGINAL_TO_PREPEND \
"diff --git a/file.txt b/file.txt\n" \
"index 9432026..0f39b9a 100644\n" \
"--- a/file.txt\n" \
"+++ b/file.txt\n" \
"@@ -1,3 +1,4 @@\n" \
"+insert at front\n" \
" hey!\n" \
" this is some context!\n" \
" around some lines\n"
#define PATCH_ORIGINAL_TO_PREPEND_NOCONTEXT \
"diff --git a/file.txt b/file.txt\n" \
"index 9432026..0f39b9a 100644\n" \
"--- a/file.txt\n" \
"+++ b/file.txt\n" \
"@@ -0,0 +1 @@\n" \
"+insert at front\n"
/* An insertion at the end of the file (and the resultant patch) */
#define FILE_APPEND \
"hey!\n" \
"this is some context!\n" \
"around some lines\n" \
"that will change\n" \
"yes it is!\n" \
"(this line is changed)\n" \
"and this\n" \
"is additional context\n" \
"below it!\n" \
"insert at end\n"
#define PATCH_ORIGINAL_TO_APPEND \
"diff --git a/file.txt b/file.txt\n" \
"index 9432026..72788bb 100644\n" \
"--- a/file.txt\n" \
"+++ b/file.txt\n" \
"@@ -7,3 +7,4 @@ yes it is!\n" \
" and this\n" \
" is additional context\n" \
" below it!\n" \
"+insert at end\n"
#define PATCH_ORIGINAL_TO_APPEND_NOCONTEXT \
"diff --git a/file.txt b/file.txt\n" \
"index 9432026..72788bb 100644\n" \
"--- a/file.txt\n" \
"+++ b/file.txt\n" \
"@@ -9,0 +10 @@ below it!\n" \
"+insert at end\n"
/* An insertion at the beginning and end of file (and the resultant patch) */
#define FILE_PREPEND_AND_APPEND \
"first and\n" \
"this is some context!\n" \
"around some lines\n" \
"that will change\n" \
"yes it is!\n" \
"(this line is changed)\n" \
"and this\n" \
"is additional context\n" \
"last lines\n"
#define PATCH_ORIGINAL_TO_PREPEND_AND_APPEND \
"diff --git a/file.txt b/file.txt\n" \
"index 9432026..f282430 100644\n" \
"--- a/file.txt\n" \
"+++ b/file.txt\n" \
"@@ -1,4 +1,4 @@\n" \
"-hey!\n" \
"+first and\n" \
" this is some context!\n" \
" around some lines\n" \
" that will change\n" \
"@@ -6,4 +6,4 @@ yes it is!\n" \
" (this line is changed)\n" \
" and this\n" \
" is additional context\n" \
"-below it!\n" \
"+last lines\n"
#define PATCH_ORIGINAL_TO_EMPTY_FILE \
"diff --git a/file.txt b/file.txt\n" \
"index 9432026..e69de29 100644\n" \
"--- a/file.txt\n" \
"+++ b/file.txt\n" \
"@@ -1,9 +0,0 @@\n" \
"-hey!\n" \
"-this is some context!\n" \
"-around some lines\n" \
"-that will change\n" \
"-yes it is!\n" \
"-(this line is changed)\n" \
"-and this\n" \
"-is additional context\n" \
"-below it!\n"
#define PATCH_EMPTY_FILE_TO_ORIGINAL \
"diff --git a/file.txt b/file.txt\n" \
"index e69de29..9432026 100644\n" \
"--- a/file.txt\n" \
"+++ b/file.txt\n" \
"@@ -0,0 +1,9 @@\n" \
"+hey!\n" \
"+this is some context!\n" \
"+around some lines\n" \
"+that will change\n" \
"+yes it is!\n" \
"+(this line is changed)\n" \
"+and this\n" \
"+is additional context\n" \
"+below it!\n"
#define PATCH_ADD_ORIGINAL \
"diff --git a/file.txt b/file.txt\n" \
"new file mode 100644\n" \
"index 0000000..9432026\n" \
"--- /dev/null\n" \
"+++ b/file.txt\n" \
"@@ -0,0 +1,9 @@\n" \
"+hey!\n" \
"+this is some context!\n" \
"+around some lines\n" \
"+that will change\n" \
"+yes it is!\n" \
"+(this line is changed)\n" \
"+and this\n" \
"+is additional context\n" \
"+below it!\n"
#define PATCH_DELETE_ORIGINAL \
"diff --git a/file.txt b/file.txt\n" \
"deleted file mode 100644\n" \
"index 9432026..0000000\n" \
"--- a/file.txt\n" \
"+++ /dev/null\n" \
"@@ -1,9 +0,0 @@\n" \
"-hey!\n" \
"-this is some context!\n" \
"-around some lines\n" \
"-that will change\n" \
"-yes it is!\n" \
"-(this line is changed)\n" \
"-and this\n" \
"-is additional context\n" \
"-below it!\n"
#define PATCH_RENAME_EXACT \
"diff --git a/file.txt b/newfile.txt\n" \
"similarity index 100%\n" \
"rename from file.txt\n" \
"rename to newfile.txt\n"
#define PATCH_RENAME_SIMILAR \
"diff --git a/file.txt b/newfile.txt\n" \
"similarity index 77%\n" \
"rename from file.txt\n" \
"rename to newfile.txt\n" \
"index 9432026..cd8fd12 100644\n" \
"--- a/file.txt\n" \
"+++ b/newfile.txt\n" \
"@@ -3,7 +3,7 @@ this is some context!\n" \
" around some lines\n" \
" that will change\n" \
" yes it is!\n" \
"-(this line is changed)\n" \
"+(THIS line is changed!)\n" \
" and this\n" \
" is additional context\n" \
" below it!\n"

176
tests/apply/fromdiff.c Normal file
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@ -0,0 +1,176 @@
#include "clar_libgit2.h"
#include "git2/sys/repository.h"
#include "apply.h"
#include "repository.h"
#include "buf_text.h"
#include "apply_common.h"
static git_repository *repo = NULL;
void test_apply_fromdiff__initialize(void)
{
repo = cl_git_sandbox_init("renames");
}
void test_apply_fromdiff__cleanup(void)
{
cl_git_sandbox_cleanup();
}
static int apply_buf(
const char *old,
const char *oldname,
const char *new,
const char *newname,
const char *patch_expected,
const git_diff_options *diff_opts)
{
git_patch *patch;
git_buf result = GIT_BUF_INIT;
git_buf patchbuf = GIT_BUF_INIT;
char *filename;
unsigned int mode;
int error;
cl_git_pass(git_patch_from_buffers(&patch,
old, old ? strlen(old) : 0, oldname,
new, new ? strlen(new) : 0, newname,
diff_opts));
cl_git_pass(git_patch_to_buf(&patchbuf, patch));
cl_assert_equal_s(patch_expected, patchbuf.ptr);
error = git_apply__patch(&result, &filename, &mode, old, old ? strlen(old) : 0, patch);
if (error == 0 && new == NULL) {
cl_assert_equal_i(0, result.size);
cl_assert_equal_p(NULL, filename);
cl_assert_equal_i(0, mode);
} else {
cl_assert_equal_s(new, result.ptr);
cl_assert_equal_s("file.txt", filename);
cl_assert_equal_i(0100644, mode);
}
git__free(filename);
git_buf_free(&result);
git_buf_free(&patchbuf);
git_patch_free(patch);
return error;
}
void test_apply_fromdiff__change_middle(void)
{
cl_git_pass(apply_buf(
FILE_ORIGINAL, "file.txt",
FILE_CHANGE_MIDDLE, "file.txt",
PATCH_ORIGINAL_TO_CHANGE_MIDDLE, NULL));
}
void test_apply_fromdiff__change_middle_nocontext(void)
{
git_diff_options diff_opts = GIT_DIFF_OPTIONS_INIT;
diff_opts.context_lines = 0;
cl_git_pass(apply_buf(
FILE_ORIGINAL, "file.txt",
FILE_CHANGE_MIDDLE, "file.txt",
PATCH_ORIGINAL_TO_CHANGE_MIDDLE_NOCONTEXT, &diff_opts));
}
void test_apply_fromdiff__change_firstline(void)
{
cl_git_pass(apply_buf(
FILE_ORIGINAL, "file.txt",
FILE_CHANGE_FIRSTLINE, "file.txt",
PATCH_ORIGINAL_TO_CHANGE_FIRSTLINE, NULL));
}
void test_apply_fromdiff__lastline(void)
{
cl_git_pass(apply_buf(
FILE_ORIGINAL, "file.txt",
FILE_CHANGE_LASTLINE, "file.txt",
PATCH_ORIGINAL_TO_CHANGE_LASTLINE, NULL));
}
void test_apply_fromdiff__prepend(void)
{
cl_git_pass(apply_buf(
FILE_ORIGINAL, "file.txt",
FILE_PREPEND, "file.txt",
PATCH_ORIGINAL_TO_PREPEND, NULL));
}
void test_apply_fromdiff__prepend_nocontext(void)
{
git_diff_options diff_opts = GIT_DIFF_OPTIONS_INIT;
diff_opts.context_lines = 0;
cl_git_pass(apply_buf(
FILE_ORIGINAL, "file.txt",
FILE_PREPEND, "file.txt",
PATCH_ORIGINAL_TO_PREPEND_NOCONTEXT, &diff_opts));
}
void test_apply_fromdiff__append(void)
{
cl_git_pass(apply_buf(
FILE_ORIGINAL, "file.txt",
FILE_APPEND, "file.txt",
PATCH_ORIGINAL_TO_APPEND, NULL));
}
void test_apply_fromdiff__append_nocontext(void)
{
git_diff_options diff_opts = GIT_DIFF_OPTIONS_INIT;
diff_opts.context_lines = 0;
cl_git_pass(apply_buf(
FILE_ORIGINAL, "file.txt",
FILE_APPEND, "file.txt",
PATCH_ORIGINAL_TO_APPEND_NOCONTEXT, &diff_opts));
}
void test_apply_fromdiff__prepend_and_append(void)
{
cl_git_pass(apply_buf(
FILE_ORIGINAL, "file.txt",
FILE_PREPEND_AND_APPEND, "file.txt",
PATCH_ORIGINAL_TO_PREPEND_AND_APPEND, NULL));
}
void test_apply_fromdiff__to_empty_file(void)
{
cl_git_pass(apply_buf(
FILE_ORIGINAL, "file.txt",
"", NULL,
PATCH_ORIGINAL_TO_EMPTY_FILE, NULL));
}
void test_apply_fromdiff__from_empty_file(void)
{
cl_git_pass(apply_buf(
"", NULL,
FILE_ORIGINAL, "file.txt",
PATCH_EMPTY_FILE_TO_ORIGINAL, NULL));
}
void test_apply_fromdiff__add(void)
{
cl_git_pass(apply_buf(
NULL, NULL,
FILE_ORIGINAL, "file.txt",
PATCH_ADD_ORIGINAL, NULL));
}
void test_apply_fromdiff__delete(void)
{
cl_git_pass(apply_buf(
FILE_ORIGINAL, "file.txt",
NULL, NULL,
PATCH_DELETE_ORIGINAL, NULL));
}