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Merge pull request #2042 from libgit2/cmn/conditional-ref

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refs: conditional ref updates
This commit is contained in:
Russell Belfer 2014-02-07 16:05:19 -08:00
commit 57c47af107
9 changed files with 444 additions and 55 deletions
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1
include/git2/errors.h
View File

@ -40,6 +40,7 @@ typedef enum {
GIT_EINVALIDSPEC = -12, /*< Name/ref spec was not in a valid format */
GIT_EMERGECONFLICT = -13, /*< Merge conflicts prevented operation */
GIT_ELOCKED = -14, /*< Lock file prevented operation */
GIT_EMODIFIED = -15, /*< Reference value does not match expected */
GIT_PASSTHROUGH = -30, /*< Internal only */
GIT_ITEROVER = -31, /*< Signals end of iteration with iterator */

109
include/git2/refs.h
View File

@ -67,6 +67,46 @@ GIT_EXTERN(int) git_reference_name_to_id(
*/
GIT_EXTERN(int) git_reference_dwim(git_reference **out, git_repository *repo, const char *shorthand);
/**
* Conditionally create a new symbolic reference.
*
* A symbolic reference is a reference name that refers to another
* reference name. If the other name moves, the symbolic name will move,
* too. As a simple example, the "HEAD" reference might refer to
* "refs/heads/master" while on the "master" branch of a repository.
*
* The symbolic reference will be created in the repository and written to
* the disk. The generated reference object must be freed by the user.
*
* Valid reference names must follow one of two patterns:
*
* 1. Top-level names must contain only capital letters and underscores,
* and must begin and end with a letter. (e.g. "HEAD", "ORIG_HEAD").
* 2. Names prefixed with "refs/" can be almost anything. You must avoid
* the characters '~', '^', ':', '\\', '?', '[', and '*', and the
* sequences ".." and "@{" which have special meaning to revparse.
*
* This function will return an error if a reference already exists with the
* given name unless `force` is true, in which case it will be overwritten.
*
* The signature and message for the reflog will be ignored if the
* reference does not belong in the standard set (HEAD, branches and
* remote-tracking branches) and it does not have a reflog.
*
* It will also return an error if the reference's value at the time
* of updating does not match the one passed.
*
* @param out Pointer to the newly created reference
* @param repo Repository where that reference will live
* @param name The name of the reference
* @param target The target of the reference
* @param force Overwrite existing references
* @param signature The identity that will used to populate the reflog entry
* @param log_message The one line long message to be appended to the reflog
* @return 0 on success, GIT_EEXISTS, GIT_EINVALIDSPEC, GIT_EMODIFIED or an error code
*/
GIT_EXTERN(int) git_reference_symbolic_create_matching(git_reference **out, git_repository *repo, const char *name, const char *target, int force, const git_signature *signature, const char *log_message, const char *old_value);
/**
* Create a new symbolic reference.
*
@ -143,6 +183,50 @@ GIT_EXTERN(int) git_reference_symbolic_create(git_reference **out, git_repositor
*/
GIT_EXTERN(int) git_reference_create(git_reference **out, git_repository *repo, const char *name, const git_oid *id, int force, const git_signature *signature, const char *log_message);
/**
* Conditionally create new direct reference
*
* A direct reference (also called an object id reference) refers directly
* to a specific object id (a.k.a. OID or SHA) in the repository. The id
* permanently refers to the object (although the reference itself can be
* moved). For example, in libgit2 the direct ref "refs/tags/v0.17.0"
* refers to OID 5b9fac39d8a76b9139667c26a63e6b3f204b3977.
*
* The direct reference will be created in the repository and written to
* the disk. The generated reference object must be freed by the user.
*
* Valid reference names must follow one of two patterns:
*
* 1. Top-level names must contain only capital letters and underscores,
* and must begin and end with a letter. (e.g. "HEAD", "ORIG_HEAD").
* 2. Names prefixed with "refs/" can be almost anything. You must avoid
* the characters '~', '^', ':', '\\', '?', '[', and '*', and the
* sequences ".." and "@{" which have special meaning to revparse.
*
* This function will return an error if a reference already exists with the
* given name unless `force` is true, in which case it will be overwritten.
*
* The signature and message for the reflog will be ignored if the
* reference does not belong in the standard set (HEAD, branches and
* remote-tracking branches) and and it does not have a reflog.
*
* It will also return an error if the reference's value at the time
* of updating does not match the one passed.
*
* @param out Pointer to the newly created reference
* @param repo Repository where that reference will live
* @param name The name of the reference
* @param id The object id pointed to by the reference.
* @param force Overwrite existing references
* @param force Overwrite existing references
* @param signature The identity that will used to populate the reflog entry
* @param log_message The one line long message to be appended to the reflog
* @param old_id The old value which the reference should have
* @return 0 on success, GIT_EMODIFIED if the value of the reference
* has changed, GIT_EEXISTS, GIT_EINVALIDSPEC or an error code
*/
GIT_EXTERN(int) git_reference_create_matching(git_reference **out, git_repository *repo, const char *name, const git_oid *id, int force, const git_signature *signature, const char *log_message, const git_oid *old_id);
/**
* Get the OID pointed to by a direct reference.
*
@ -254,22 +338,19 @@ GIT_EXTERN(int) git_reference_symbolic_set_target(
const char *log_message);
/**
* Create a new reference with the same name as the given reference but a
* Conditionally create a new reference with the same name as the given reference but a
* different OID target. The reference must be a direct reference, otherwise
* this will fail.
*
* The new reference will be written to disk, overwriting the given reference.
*
* The signature and message for the reflog will be ignored if the
* reference does not belong in the standard set (HEAD, branches and
* remote-tracking branches) and and it does not have a reflog.
*
* @param out Pointer to the newly created reference
* @param ref The reference
* @param id The new target OID for the reference
* @param signature The identity that will used to populate the reflog entry
* @param log_message The one line long message to be appended to the reflog
* @return 0 or an error code
* @return 0 on success, GIT_EMODIFIED if the value of the reference
* has changed, or an error code
*/
GIT_EXTERN(int) git_reference_set_target(
git_reference **out,
@ -317,11 +398,25 @@ GIT_EXTERN(int) git_reference_rename(
* will be immediately removed on disk but the memory will not be freed.
* Callers must call `git_reference_free`.
*
* This function will return an error if the reference has changed
* from the time it was looked up.
*
* @param ref The reference to remove
* @return 0 or an error code
* @return 0, GIT_EMODIFIED or an error code
*/
GIT_EXTERN(int) git_reference_delete(git_reference *ref);
/**
* Delete an existing reference by name
*
* This method removes the named reference from the repository without
* looking at its old value.
*
* @param ref The reference to remove
* @return 0, GIT_EMODIFIED or an error code
*/
GIT_EXTERN(int) git_reference_remove(git_repository *repo, const char *name);
/**
* Fill a list with all the references that can be found in a repository.
*

5
include/git2/sys/refdb_backend.h
View File

@ -94,7 +94,8 @@ struct git_refdb_backend {
*/
int (*write)(git_refdb_backend *backend,
const git_reference *ref, int force,
const git_signature *who, const char *message);
const git_signature *who, const char *message,
const git_oid *old, const char *old_target);
int (*rename)(
git_reference **out, git_refdb_backend *backend,
@ -105,7 +106,7 @@ struct git_refdb_backend {
* Deletes the given reference from the refdb. A refdb implementation
* must provide this function.
*/
int (*del)(git_refdb_backend *backend, const char *ref_name);
int (*del)(git_refdb_backend *backend, const char *ref_name, const git_oid *old_id, const char *old_target);
/**
* Suggests that the given refdb compress or optimize its references.

8
src/refdb.c
View File

@ -167,14 +167,14 @@ void git_refdb_iterator_free(git_reference_iterator *iter)
iter->free(iter);
}
int git_refdb_write(git_refdb *db, git_reference *ref, int force, const git_signature *who, const char *message)
int git_refdb_write(git_refdb *db, git_reference *ref, int force, const git_signature *who, const char *message, const git_oid *old_id, const char *old_target)
{
assert(db && db->backend);
GIT_REFCOUNT_INC(db);
ref->db = db;
return db->backend->write(db->backend, ref, force, who, message);
return db->backend->write(db->backend, ref, force, who, message, old_id, old_target);
}
int git_refdb_rename(
@ -201,10 +201,10 @@ int git_refdb_rename(
return 0;
}
int git_refdb_delete(struct git_refdb *db, const char *ref_name)
int git_refdb_delete(struct git_refdb *db, const char *ref_name, const git_oid *old_id, const char *old_target)
{
assert(db && db->backend);
return db->backend->del(db->backend, ref_name);
return db->backend->del(db->backend, ref_name, old_id, old_target);
}
int git_refdb_reflog_read(git_reflog **out, git_refdb *db, const char *name)

4
src/refdb.h
View File

@ -42,8 +42,8 @@ int git_refdb_iterator_next(git_reference **out, git_reference_iterator *iter);
int git_refdb_iterator_next_name(const char **out, git_reference_iterator *iter);
void git_refdb_iterator_free(git_reference_iterator *iter);
int git_refdb_write(git_refdb *refdb, git_reference *ref, int force, const git_signature *who, const char *message);
int git_refdb_delete(git_refdb *refdb, const char *ref_name);
int git_refdb_write(git_refdb *refdb, git_reference *ref, int force, const git_signature *who, const char *message, const git_oid *old_id, const char *old_target);
int git_refdb_delete(git_refdb *refdb, const char *ref_name, const git_oid *old_id, const char *old_target);
int git_refdb_reflog_read(git_reflog **out, git_refdb *db, const char *name);
int git_refdb_reflog_write(git_reflog *reflog);

126
src/refdb_fs.c
View File

@ -688,30 +688,32 @@ static int reference_path_available(
return 0;
}
static int loose_lock(git_filebuf *file, refdb_fs_backend *backend, const git_reference *ref)
static int loose_lock(git_filebuf *file, refdb_fs_backend *backend, const char *name)
{
int error;
git_buf ref_path = GIT_BUF_INIT;
assert(file && backend && name);
/* Remove a possibly existing empty directory hierarchy
* which name would collide with the reference name
*/
if (git_futils_rmdir_r(ref->name, backend->path, GIT_RMDIR_SKIP_NONEMPTY) < 0)
if (git_futils_rmdir_r(name, backend->path, GIT_RMDIR_SKIP_NONEMPTY) < 0)
return -1;
if (git_buf_joinpath(&ref_path, backend->path, ref->name) < 0)
if (git_buf_joinpath(&ref_path, backend->path, name) < 0)
return -1;
if (git_filebuf_open(file, ref_path.ptr, GIT_FILEBUF_FORCE, GIT_REFS_FILE_MODE) < 0) {
git_buf_free(&ref_path);
return -1;
}
error = git_filebuf_open(file, ref_path.ptr, GIT_FILEBUF_FORCE, GIT_REFS_FILE_MODE);
git_buf_free(&ref_path);
return 0;
return error;
}
static int loose_commit(git_filebuf *file, const git_reference *ref)
{
assert(file && ref);
if (ref->type == GIT_REF_OID) {
char oid[GIT_OID_HEXSZ + 1];
git_oid_nfmt(oid, sizeof(oid), &ref->target.oid);
@ -928,16 +930,54 @@ static bool should_write_reflog(git_repository *repo, const char *name)
return 0;
}
static int cmp_old_ref(int *cmp, git_refdb_backend *backend, const char *name,
const git_oid *old_id, const char *old_target)
{
int error = 0;
git_reference *old_ref = NULL;
*cmp = 0;
/* It "matches" if there is no old value to compare against */
if (!old_id && !old_target)
return 0;
if ((error = refdb_fs_backend__lookup(&old_ref, backend, name)) < 0)
goto out;
/* If the types don't match, there's no way the values do */
if (old_id && old_ref->type != GIT_REF_OID) {
*cmp = -1;
goto out;
}
if (old_target && old_ref->type != GIT_REF_SYMBOLIC) {
*cmp = 1;
goto out;
}
if (old_id && old_ref->type == GIT_REF_OID)
*cmp = git_oid_cmp(old_id, &old_ref->target.oid);
if (old_target && old_ref->type == GIT_REF_SYMBOLIC)
*cmp = git__strcmp(old_target, old_ref->target.symbolic);
out:
git_reference_free(old_ref);
return error;
}
static int refdb_fs_backend__write(
git_refdb_backend *_backend,
const git_reference *ref,
int force,
const git_signature *who,
const char *message)
const char *message,
const git_oid *old_id,
const char *old_target)
{
refdb_fs_backend *backend = (refdb_fs_backend *)_backend;
git_filebuf file = GIT_FILEBUF_INIT;
int error;
int error = 0, cmp = 0;
assert(backend);
@ -945,10 +985,19 @@ static int refdb_fs_backend__write(
if (error < 0)
return error;
/* We need to perform the reflog append under the ref's lock */
if ((error = loose_lock(&file, backend, ref)) < 0)
/* We need to perform the reflog append and old value check under the ref's lock */
if ((error = loose_lock(&file, backend, ref->name)) < 0)
return error;
if ((error = cmp_old_ref(&cmp, _backend, ref->name, old_id, old_target)) < 0)
goto on_error;
if (cmp) {
giterr_set(GITERR_REFERENCE, "old reference value does not match");
error = GIT_EMODIFIED;
goto on_error;
}
if (should_write_reflog(backend->repo, ref->name) &&
(error = reflog_append(backend, ref, who, message)) < 0) {
git_filebuf_cleanup(&file);
@ -956,20 +1005,40 @@ static int refdb_fs_backend__write(
}
return loose_commit(&file, ref);
on_error:
git_filebuf_cleanup(&file);
return error;
}
static int refdb_fs_backend__delete(
git_refdb_backend *_backend,
const char *ref_name)
const char *ref_name,
const git_oid *old_id, const char *old_target)
{
refdb_fs_backend *backend = (refdb_fs_backend *)_backend;
git_buf loose_path = GIT_BUF_INIT;
size_t pack_pos;
int error = 0;
size_t pack_pos
; git_filebuf file = GIT_FILEBUF_INIT;
int error = 0, cmp = 0;
bool loose_deleted = 0;
assert(backend && ref_name);
if ((error = loose_lock(&file, backend, ref_name)) < 0)
return error;
error = cmp_old_ref(&cmp, _backend, ref_name, old_id, old_target);
//git_filebuf_cleanup(&file);
if (error < 0)
goto cleanup;
if (cmp) {
giterr_set(GITERR_REFERENCE, "old reference value does not match");
error = GIT_EMODIFIED;
goto cleanup;
}
/* If a loose reference exists, remove it from the filesystem */
if (git_buf_joinpath(&loose_path, backend->path, ref_name) < 0)
return -1;
@ -982,14 +1051,14 @@ static int refdb_fs_backend__delete(
git_buf_free(&loose_path);
if (error != 0)
return error;
goto cleanup;
if (packed_reload(backend) < 0)
return -1;
if ((error = packed_reload(backend)) < 0)
goto cleanup;
/* If a packed reference exists, remove it from the packfile and repack */
if (git_sortedcache_wlock(backend->refcache) < 0)
return -1;
if ((error = git_sortedcache_wlock(backend->refcache)) < 0)
goto cleanup;
if (!(error = git_sortedcache_lookup_index(
&pack_pos, backend->refcache, ref_name)))
@ -997,10 +1066,17 @@ static int refdb_fs_backend__delete(
git_sortedcache_wunlock(backend->refcache);
if (error == GIT_ENOTFOUND)
return loose_deleted ? 0 : ref_error_notfound(ref_name);
if (error == GIT_ENOTFOUND) {
error = loose_deleted ? 0 : ref_error_notfound(ref_name);
goto cleanup;
}
return packed_write(backend);
error = packed_write(backend);
cleanup:
git_filebuf_cleanup(&file);
return error;
}
static int refdb_reflog_fs__rename(git_refdb_backend *_backend, const char *old_name, const char *new_name);
@ -1026,7 +1102,7 @@ static int refdb_fs_backend__rename(
(error = refdb_fs_backend__lookup(&old, _backend, old_name)) < 0)
return error;
if ((error = refdb_fs_backend__delete(_backend, old_name)) < 0) {
if ((error = refdb_fs_backend__delete(_backend, old_name, NULL, NULL)) < 0) {
git_reference_free(old);
return error;
}
@ -1037,7 +1113,7 @@ static int refdb_fs_backend__rename(
return -1;
}
if ((error = loose_lock(&file, backend, new)) < 0) {
if ((error = loose_lock(&file, backend, new->name)) < 0) {
git_reference_free(new);
return error;
}

80
src/refs.c
View File

@ -116,7 +116,26 @@ void git_reference_free(git_reference *reference)
int git_reference_delete(git_reference *ref)
{
return git_refdb_delete(ref->db, ref->name);
const git_oid *old_id = NULL;
const char *old_target = NULL;
if (ref->type == GIT_REF_OID)
old_id = &ref->target.oid;
else
old_target = ref->target.symbolic;
return git_refdb_delete(ref->db, ref->name, old_id, old_target);
}
int git_reference_remove(git_repository *repo, const char *name)
{
git_refdb *db;
int error;
if ((error = git_repository_refdb__weakptr(&db, repo)) < 0)
return error;
return git_refdb_delete(db, name, NULL, NULL);
}
int git_reference_lookup(git_reference **ref_out,
@ -331,7 +350,9 @@ static int reference__create(
const char *symbolic,
int force,
const git_signature *signature,
const char *log_message)
const char *log_message,
const git_oid *old_id,
const char *old_target)
{
char normalized[GIT_REFNAME_MAX];
git_refdb *refdb;
@ -380,7 +401,7 @@ static int reference__create(
GITERR_CHECK_ALLOC(ref);
if ((error = git_refdb_write(refdb, ref, force, signature, log_message)) < 0) {
if ((error = git_refdb_write(refdb, ref, force, signature, log_message, old_id, old_target)) < 0) {
git_reference_free(ref);
return error;
}
@ -406,19 +427,21 @@ static int log_signature(git_signature **out, git_repository *repo)
return 0;
}
int git_reference_create(
int git_reference_create_matching(
git_reference **ref_out,
git_repository *repo,
const char *name,
const git_oid *oid,
const git_oid *id,
int force,
const git_signature *signature,
const char *log_message)
const char *log_message,
const git_oid *old_id)
{
int error;
git_signature *who = NULL;
assert(oid);
assert(id);
if (!signature) {
if ((error = log_signature(&who, repo)) < 0)
@ -428,20 +451,33 @@ int git_reference_create(
}
error = reference__create(
ref_out, repo, name, oid, NULL, force, signature, log_message);
ref_out, repo, name, id, NULL, force, signature, log_message, old_id, NULL);
git_signature_free(who);
return error;
}
int git_reference_symbolic_create(
int git_reference_create(
git_reference **ref_out,
git_repository *repo,
const char *name,
const git_oid *id,
int force,
const git_signature *signature,
const char *log_message)
{
return git_reference_create_matching(ref_out, repo, name, id, force, signature, log_message, NULL);
}
int git_reference_symbolic_create_matching(
git_reference **ref_out,
git_repository *repo,
const char *name,
const char *target,
int force,
const git_signature *signature,
const char *log_message)
const char *log_message,
const char *old_target)
{
int error;
git_signature *who = NULL;
@ -456,12 +492,24 @@ int git_reference_symbolic_create(
}
error = reference__create(
ref_out, repo, name, NULL, target, force, signature, log_message);
ref_out, repo, name, NULL, target, force, signature, log_message, NULL, old_target);
git_signature_free(who);
return error;
}
int git_reference_symbolic_create(
git_reference **ref_out,
git_repository *repo,
const char *name,
const char *target,
int force,
const git_signature *signature,
const char *log_message)
{
return git_reference_symbolic_create_matching(ref_out, repo, name, target, force, signature, log_message, NULL);
}
static int ensure_is_an_updatable_direct_reference(git_reference *ref)
{
if (ref->type == GIT_REF_OID)
@ -479,14 +527,16 @@ int git_reference_set_target(
const char *log_message)
{
int error;
git_repository *repo;
assert(out && ref && id);
repo = ref->db->repo;
if ((error = ensure_is_an_updatable_direct_reference(ref)) < 0)
return error;
return git_reference_create(
out, ref->db->repo, ref->name, id, 1, signature, log_message);
return git_reference_create_matching(out, repo, ref->name, id, 1, signature, log_message, &ref->target.oid);
}
static int ensure_is_an_updatable_symbolic_reference(git_reference *ref)
@ -512,8 +562,8 @@ int git_reference_symbolic_set_target(
if ((error = ensure_is_an_updatable_symbolic_reference(ref)) < 0)
return error;
return git_reference_symbolic_create(
out, ref->db->repo, ref->name, target, 1, signature, log_message);
return git_reference_symbolic_create_matching(
out, ref->db->repo, ref->name, target, 1, signature, log_message, ref->target.symbolic);
}
static int reference__rename(git_reference **out, git_reference *ref, const char *new_name, int force,

14
tests/refs/delete.c
View File

@ -91,3 +91,17 @@ void test_refs_delete__packed_only(void)
git_reference_free(ref);
git_refdb_free(refdb);
}
void test_refs_delete__remove(void)
{
git_reference *ref;
/* Check that passing no old values lets us delete */
cl_git_pass(git_reference_lookup(&ref, g_repo, packed_test_head_name));
git_reference_free(ref);
cl_git_pass(git_reference_remove(g_repo, packed_test_head_name));
cl_git_fail(git_reference_lookup(&ref, g_repo, packed_test_head_name));
}

152
tests/refs/races.c Normal file
View File

@ -0,0 +1,152 @@
#include "clar_libgit2.h"
#include "repository.h"
#include "git2/reflog.h"
#include "reflog.h"
#include "ref_helpers.h"
static const char *commit_id = "099fabac3a9ea935598528c27f866e34089c2eff";
static const char *refname = "refs/heads/master";
static const char *other_refname = "refs/heads/foo";
static const char *other_commit_id = "a65fedf39aefe402d3bb6e24df4d4f5fe4547750";
static git_repository *g_repo;
void test_refs_races__initialize(void)
{
g_repo = cl_git_sandbox_init("testrepo");
}
void test_refs_races__cleanup(void)
{
cl_git_sandbox_cleanup();
}
void test_refs_races__create_matching(void)
{
git_reference *ref, *ref2, *ref3;
git_oid id, other_id;
git_oid_fromstr(&id, commit_id);
git_oid_fromstr(&other_id, other_commit_id);
cl_git_fail_with(GIT_EMODIFIED, git_reference_create_matching(&ref, g_repo, refname, &other_id, 1, NULL, NULL, &other_id));
cl_git_pass(git_reference_lookup(&ref, g_repo, refname));
cl_git_pass(git_reference_create_matching(&ref2, g_repo, refname, &other_id, 1, NULL, NULL, &id));
cl_git_fail_with(GIT_EMODIFIED, git_reference_set_target(&ref3, ref, &other_id, NULL, NULL));
git_reference_free(ref);
git_reference_free(ref2);
git_reference_free(ref3);
}
void test_refs_races__symbolic_create_matching(void)
{
git_reference *ref, *ref2, *ref3;
git_oid id, other_id;
git_oid_fromstr(&id, commit_id);
git_oid_fromstr(&other_id, other_commit_id);
cl_git_fail_with(GIT_EMODIFIED, git_reference_symbolic_create_matching(&ref, g_repo, "HEAD", other_refname, 1, NULL, NULL, other_refname));
cl_git_pass(git_reference_lookup(&ref, g_repo, "HEAD"));
cl_git_pass(git_reference_symbolic_create_matching(&ref2, g_repo, "HEAD", other_refname, 1, NULL, NULL, refname));
cl_git_fail_with(GIT_EMODIFIED, git_reference_symbolic_set_target(&ref3, ref, other_refname, NULL, NULL));
git_reference_free(ref);
git_reference_free(ref2);
git_reference_free(ref3);
}
void test_refs_races__delete(void)
{
git_reference *ref, *ref2;
git_oid id, other_id;
git_oid_fromstr(&id, commit_id);
git_oid_fromstr(&other_id, other_commit_id);
/* We can delete a value that matches */
cl_git_pass(git_reference_lookup(&ref, g_repo, refname));
cl_git_pass(git_reference_delete(ref));
git_reference_free(ref);
/* We cannot delete a symbolic value that doesn't match */
cl_git_pass(git_reference_lookup(&ref, g_repo, "HEAD"));
cl_git_pass(git_reference_symbolic_create_matching(&ref2, g_repo, "HEAD", other_refname, 1, NULL, NULL, refname));
cl_git_fail_with(GIT_EMODIFIED, git_reference_delete(ref));
git_reference_free(ref);
git_reference_free(ref2);
cl_git_pass(git_reference_create(&ref, g_repo, refname, &id, 1, NULL, NULL));
git_reference_free(ref);
/* We cannot delete an oid value that doesn't match */
cl_git_pass(git_reference_lookup(&ref, g_repo, refname));
cl_git_pass(git_reference_create_matching(&ref2, g_repo, refname, &other_id, 1, NULL, NULL, &id));
cl_git_fail_with(GIT_EMODIFIED, git_reference_delete(ref));
git_reference_free(ref);
git_reference_free(ref2);
}
void test_refs_races__switch_oid_to_symbolic(void)
{
git_reference *ref, *ref2, *ref3;
git_oid id, other_id;
git_oid_fromstr(&id, commit_id);
git_oid_fromstr(&other_id, other_commit_id);
/* Removing a direct ref when it's currently symbolic should fail */
cl_git_pass(git_reference_lookup(&ref, g_repo, refname));
cl_git_pass(git_reference_symbolic_create(&ref2, g_repo, refname, other_refname, 1, NULL, NULL));
cl_git_fail_with(GIT_EMODIFIED, git_reference_delete(ref));
git_reference_free(ref);
git_reference_free(ref2);
cl_git_pass(git_reference_create(&ref, g_repo, refname, &id, 1, NULL, NULL));
git_reference_free(ref);
/* Updating a direct ref when it's currently symbolic should fail */
cl_git_pass(git_reference_lookup(&ref, g_repo, refname));
cl_git_pass(git_reference_symbolic_create(&ref2, g_repo, refname, other_refname, 1, NULL, NULL));
cl_git_fail_with(GIT_EMODIFIED, git_reference_set_target(&ref3, ref, &other_id, NULL, NULL));
git_reference_free(ref);
git_reference_free(ref2);
git_reference_free(ref3);
}
void test_refs_races__switch_symbolic_to_oid(void)
{
git_reference *ref, *ref2, *ref3;
git_oid id, other_id;
git_oid_fromstr(&id, commit_id);
git_oid_fromstr(&other_id, other_commit_id);
/* Removing a symbolic ref when it's currently direct should fail */
cl_git_pass(git_reference_lookup(&ref, g_repo, "HEAD"));
cl_git_pass(git_reference_create(&ref2, g_repo, "HEAD", &id, 1, NULL, NULL));
cl_git_fail_with(GIT_EMODIFIED, git_reference_delete(ref));
git_reference_free(ref);
git_reference_free(ref2);
cl_git_pass(git_reference_symbolic_create(&ref, g_repo, "HEAD", refname, 1, NULL, NULL));
git_reference_free(ref);
/* Updating a symbolic ref when it's currently direct should fail */
cl_git_pass(git_reference_lookup(&ref, g_repo, "HEAD"));
cl_git_pass(git_reference_create(&ref2, g_repo, "HEAD", &id, 1, NULL, NULL));
cl_git_fail_with(GIT_EMODIFIED, git_reference_symbolic_set_target(&ref3, ref, other_refname, NULL, NULL));
git_reference_free(ref);
git_reference_free(ref2);
git_reference_free(ref3);
}