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Copy pathrefs.c
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1745 lines (1361 loc) · 47.8 KB
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/*
* Copyright (C) 2009-2011 the libgit2 contributors
*
* 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 "refs.h"
#include "hash.h"
#include "repository.h"
#include "fileops.h"
#include <git2/tag.h>
#include <git2/object.h>
#define MAX_NESTING_LEVEL 5
typedef struct {
git_reference ref;
git_oid oid;
git_oid peel_target;
} reference_oid;
typedef struct {
git_reference ref;
char *target;
} reference_symbolic;
static const int default_table_size = 32;
static uint32_t reftable_hash(const void *key, int hash_id)
{
static uint32_t hash_seeds[GIT_HASHTABLE_HASHES] = {
2147483647,
0x5d20bb23,
0x7daaab3c
};
return git__hash(key, strlen((const char *)key), hash_seeds[hash_id]);
}
static void reference_free(git_reference *reference);
static int reference_create(git_reference **ref_out, git_repository *repo, const char *name, git_rtype type);
static int reference_read(git_fbuffer *file_content, time_t *mtime, const char *repo_path, const char *ref_name, int *updated);
/* loose refs */
static int loose_parse_symbolic(git_reference *ref, git_fbuffer *file_content);
static int loose_parse_oid(git_reference *ref, git_fbuffer *file_content);
static int loose_lookup(git_reference **ref_out, git_repository *repo, const char *name, int skip_symbolic);
static int loose_write(git_reference *ref);
static int loose_update(git_reference *ref);
/* packed refs */
static int packed_parse_peel(reference_oid *tag_ref, const char **buffer_out, const char *buffer_end);
static int packed_parse_oid(reference_oid **ref_out, git_repository *repo, const char **buffer_out, const char *buffer_end);
static int packed_load(git_repository *repo);
static int packed_loadloose(git_repository *repository);
static int packed_write_ref(reference_oid *ref, git_filebuf *file);
static int packed_find_peel(reference_oid *ref);
static int packed_remove_loose(git_repository *repo, git_vector *packing_list);
static int packed_sort(const void *a, const void *b);
static int packed_write(git_repository *repo);
/* internal helpers */
static int reference_available(git_repository *repo, const char *ref, const char *old_ref);
/* name normalization */
static int check_valid_ref_char(char ch);
static int normalize_name(char *buffer_out, size_t out_size, const char *name, int is_oid_ref);
/*****************************************
* Internal methods - Constructor/destructor
*****************************************/
static void reference_free(git_reference *reference)
{
if (reference == NULL)
return;
if (reference->name)
free(reference->name);
if (reference->type == GIT_REF_SYMBOLIC)
free(((reference_symbolic *)reference)->target);
free(reference);
}
static int reference_create(
git_reference **ref_out,
git_repository *repo,
const char *name,
git_rtype type)
{
char normalized[GIT_REFNAME_MAX];
int error = GIT_SUCCESS, size;
git_reference *reference = NULL;
assert(ref_out && repo && name);
if (type == GIT_REF_SYMBOLIC)
size = sizeof(reference_symbolic);
else if (type == GIT_REF_OID)
size = sizeof(reference_oid);
else
return git__throw(GIT_EINVALIDARGS,
"Invalid reference type. Use either GIT_REF_OID or GIT_REF_SYMBOLIC as type specifier");
reference = git__malloc(size);
if (reference == NULL)
return GIT_ENOMEM;
memset(reference, 0x0, size);
reference->owner = repo;
reference->type = type;
error = normalize_name(normalized, sizeof(normalized), name, (type & GIT_REF_OID));
if (error < GIT_SUCCESS)
goto cleanup;
reference->name = git__strdup(normalized);
if (reference->name == NULL) {
error = GIT_ENOMEM;
goto cleanup;
}
*ref_out = reference;
return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to create reference");
cleanup:
reference_free(reference);
return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to create reference");
}
static int reference_read(git_fbuffer *file_content, time_t *mtime, const char *repo_path, const char *ref_name, int *updated)
{
char path[GIT_PATH_MAX];
assert(file_content && repo_path && ref_name);
/* Determine the full path of the file */
git_path_join(path, repo_path, ref_name);
return git_futils_readbuffer_updated(file_content, path, mtime, updated);
}
/*****************************************
* Internal methods - Loose references
*****************************************/
static int loose_update(git_reference *ref)
{
int error, updated;
git_fbuffer ref_file = GIT_FBUFFER_INIT;
if (ref->type & GIT_REF_PACKED)
return packed_load(ref->owner);
/* error = reference_read(NULL, &ref_time, ref->owner->path_repository, ref->name);
if (error < GIT_SUCCESS)
goto cleanup;
if (ref_time == ref->mtime)
return GIT_SUCCESS;
*/
error = reference_read(&ref_file, &ref->mtime, ref->owner->path_repository, ref->name, &updated);
if (error < GIT_SUCCESS)
goto cleanup;
if (!updated)
goto cleanup;
if (ref->type == GIT_REF_SYMBOLIC)
error = loose_parse_symbolic(ref, &ref_file);
else if (ref->type == GIT_REF_OID)
error = loose_parse_oid(ref, &ref_file);
else
error = git__throw(GIT_EOBJCORRUPTED,
"Invalid reference type (%d) for loose reference", ref->type);
cleanup:
git_futils_freebuffer(&ref_file);
if (error != GIT_SUCCESS) {
reference_free(ref);
git_hashtable_remove(ref->owner->references.loose_cache, ref->name);
}
return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to update loose reference");
}
static int loose_parse_symbolic(git_reference *ref, git_fbuffer *file_content)
{
const unsigned int header_len = strlen(GIT_SYMREF);
const char *refname_start;
char *eol;
reference_symbolic *ref_sym;
refname_start = (const char *)file_content->data;
ref_sym = (reference_symbolic *)ref;
if (file_content->len < (header_len + 1))
return git__throw(GIT_EOBJCORRUPTED,
"Failed to parse loose reference. Object too short");
/*
* Assume we have already checked for the header
* before calling this function
*/
refname_start += header_len;
free(ref_sym->target);
ref_sym->target = git__strdup(refname_start);
if (ref_sym->target == NULL)
return GIT_ENOMEM;
/* remove newline at the end of file */
eol = strchr(ref_sym->target, '\n');
if (eol == NULL)
return git__throw(GIT_EOBJCORRUPTED,
"Failed to parse loose reference. Missing EOL");
*eol = '\0';
if (eol[-1] == '\r')
eol[-1] = '\0';
return GIT_SUCCESS;
}
static int loose_parse_oid(git_reference *ref, git_fbuffer *file_content)
{
int error;
reference_oid *ref_oid;
char *buffer;
buffer = (char *)file_content->data;
ref_oid = (reference_oid *)ref;
/* File format: 40 chars (OID) + newline */
if (file_content->len < GIT_OID_HEXSZ + 1)
return git__throw(GIT_EOBJCORRUPTED,
"Failed to parse loose reference. Reference too short");
if ((error = git_oid_fromstr(&ref_oid->oid, buffer)) < GIT_SUCCESS)
return git__rethrow(GIT_EOBJCORRUPTED, "Failed to parse loose reference.");
buffer = buffer + GIT_OID_HEXSZ;
if (*buffer == '\r')
buffer++;
if (*buffer != '\n')
return git__throw(GIT_EOBJCORRUPTED,
"Failed to parse loose reference. Missing EOL");
return GIT_SUCCESS;
}
static git_rtype loose_guess_rtype(const char *full_path)
{
git_fbuffer ref_file = GIT_FBUFFER_INIT;
git_rtype type;
type = GIT_REF_INVALID;
if (git_futils_readbuffer(&ref_file, full_path) == GIT_SUCCESS) {
if (git__prefixcmp((const char *)(ref_file.data), GIT_SYMREF) == 0)
type = GIT_REF_SYMBOLIC;
else
type = GIT_REF_OID;
}
git_futils_freebuffer(&ref_file);
return type;
}
static int loose_lookup(
git_reference **ref_out,
git_repository *repo,
const char *name,
int skip_symbolic)
{
int error = GIT_SUCCESS;
git_fbuffer ref_file = GIT_FBUFFER_INIT;
git_reference *ref = NULL;
time_t ref_time = 0;
*ref_out = NULL;
error = reference_read(&ref_file, &ref_time, repo->path_repository, name, NULL);
if (error < GIT_SUCCESS)
goto cleanup;
if (git__prefixcmp((const char *)(ref_file.data), GIT_SYMREF) == 0) {
if (skip_symbolic)
return GIT_SUCCESS;
error = reference_create(&ref, repo, name, GIT_REF_SYMBOLIC);
if (error < GIT_SUCCESS)
goto cleanup;
error = loose_parse_symbolic(ref, &ref_file);
} else {
error = reference_create(&ref, repo, name, GIT_REF_OID);
if (error < GIT_SUCCESS)
goto cleanup;
error = loose_parse_oid(ref, &ref_file);
}
if (error < GIT_SUCCESS)
goto cleanup;
ref->mtime = ref_time;
*ref_out = ref;
git_futils_freebuffer(&ref_file);
return GIT_SUCCESS;
cleanup:
git_futils_freebuffer(&ref_file);
reference_free(ref);
return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to lookup loose reference");
}
static int loose_write(git_reference *ref)
{
git_filebuf file;
char ref_path[GIT_PATH_MAX];
int error;
struct stat st;
git_path_join(ref_path, ref->owner->path_repository, ref->name);
if ((error = git_filebuf_open(&file, ref_path, GIT_FILEBUF_FORCE)) < GIT_SUCCESS)
return git__rethrow(error, "Failed to write loose reference");
if (ref->type & GIT_REF_OID) {
reference_oid *ref_oid = (reference_oid *)ref;
char oid[GIT_OID_HEXSZ + 1];
memset(oid, 0x0, sizeof(oid));
git_oid_fmt(oid, &ref_oid->oid);
error = git_filebuf_printf(&file, "%s\n", oid);
if (error < GIT_SUCCESS)
goto unlock;
} else if (ref->type & GIT_REF_SYMBOLIC) { /* GIT_REF_SYMBOLIC */
reference_symbolic *ref_sym = (reference_symbolic *)ref;
error = git_filebuf_printf(&file, GIT_SYMREF "%s\n", ref_sym->target);
} else {
error = git__throw(GIT_EOBJCORRUPTED, "Failed to write reference. Invalid reference type");
goto unlock;
}
error = git_filebuf_commit(&file);
if (p_stat(ref_path, &st) == GIT_SUCCESS)
ref->mtime = st.st_mtime;
return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to write loose reference");
unlock:
git_filebuf_cleanup(&file);
return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to write loose reference");
}
/*****************************************
* Internal methods - Packed references
*****************************************/
static int packed_parse_peel(
reference_oid *tag_ref,
const char **buffer_out,
const char *buffer_end)
{
const char *buffer = *buffer_out + 1;
assert(buffer[-1] == '^');
/* Ensure it's not the first entry of the file */
if (tag_ref == NULL)
return git__throw(GIT_EPACKEDREFSCORRUPTED, "Failed to parse packed reference. Reference is the first entry of the file");
/* Ensure reference is a tag */
if (git__prefixcmp(tag_ref->ref.name, GIT_REFS_TAGS_DIR) != 0)
return git__throw(GIT_EPACKEDREFSCORRUPTED, "Failed to parse packed reference. Reference is not a tag");
if (buffer + GIT_OID_HEXSZ >= buffer_end)
return git__throw(GIT_EPACKEDREFSCORRUPTED, "Failed to parse packed reference. Buffer too small");
/* Is this a valid object id? */
if (git_oid_fromstr(&tag_ref->peel_target, buffer) < GIT_SUCCESS)
return git__throw(GIT_EPACKEDREFSCORRUPTED, "Failed to parse packed reference. Not a valid object ID");
buffer = buffer + GIT_OID_HEXSZ;
if (*buffer == '\r')
buffer++;
if (*buffer != '\n')
return git__throw(GIT_EPACKEDREFSCORRUPTED, "Failed to parse packed reference. Buffer not terminated correctly");
*buffer_out = buffer + 1;
tag_ref->ref.type |= GIT_REF_HAS_PEEL;
return GIT_SUCCESS;
}
static int packed_parse_oid(
reference_oid **ref_out,
git_repository *repo,
const char **buffer_out,
const char *buffer_end)
{
git_reference *_ref = NULL;
reference_oid *ref = NULL;
const char *buffer = *buffer_out;
const char *refname_begin, *refname_end;
int error = GIT_SUCCESS;
int refname_len;
char refname[GIT_REFNAME_MAX];
git_oid id;
refname_begin = (buffer + GIT_OID_HEXSZ + 1);
if (refname_begin >= buffer_end ||
refname_begin[-1] != ' ') {
error = GIT_EPACKEDREFSCORRUPTED;
goto cleanup;
}
/* Is this a valid object id? */
if ((error = git_oid_fromstr(&id, buffer)) < GIT_SUCCESS)
goto cleanup;
refname_end = memchr(refname_begin, '\n', buffer_end - refname_begin);
if (refname_end == NULL) {
error = GIT_EPACKEDREFSCORRUPTED;
goto cleanup;
}
refname_len = refname_end - refname_begin;
memcpy(refname, refname_begin, refname_len);
refname[refname_len] = 0;
if (refname[refname_len - 1] == '\r')
refname[refname_len - 1] = 0;
error = reference_create(&_ref, repo, refname, GIT_REF_OID);
if (error < GIT_SUCCESS)
goto cleanup;
ref = (reference_oid *)_ref;
git_oid_cpy(&ref->oid, &id);
ref->ref.type |= GIT_REF_PACKED;
*ref_out = ref;
*buffer_out = refname_end + 1;
return GIT_SUCCESS;
cleanup:
reference_free((git_reference *)ref);
return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to parse OID of packed reference");
}
static int packed_load(git_repository *repo)
{
int error = GIT_SUCCESS, updated;
git_fbuffer packfile = GIT_FBUFFER_INIT;
const char *buffer_start, *buffer_end;
git_refcache *ref_cache = &repo->references;
/* First we make sure we have allocated the hash table */
if (ref_cache->packfile == NULL) {
ref_cache->packfile = git_hashtable_alloc(
default_table_size,
reftable_hash,
(git_hash_keyeq_ptr)(&git__strcmp_cb));
if (ref_cache->packfile == NULL) {
error = GIT_ENOMEM;
goto cleanup;
}
}
error = reference_read(&packfile, &ref_cache->packfile_time,
repo->path_repository, GIT_PACKEDREFS_FILE, &updated);
/*
* If we couldn't find the file, we need to clear the table and
* return. On any other error, we return that error. If everything
* went fine and the file wasn't updated, then there's nothing new
* for us here, so just return. Anything else means we need to
* refresh the packed refs.
*/
if (error == GIT_ENOTFOUND) {
git_hashtable_clear(ref_cache->packfile);
return GIT_SUCCESS;
} else if (error < GIT_SUCCESS) {
return git__rethrow(error, "Failed to read packed refs");
} else if (!updated) {
return GIT_SUCCESS;
}
/*
* At this point, we want to refresh the packed refs. We already
* have the contents in our buffer.
*/
git_hashtable_clear(ref_cache->packfile);
buffer_start = (const char *)packfile.data;
buffer_end = (const char *)(buffer_start) + packfile.len;
while (buffer_start < buffer_end && buffer_start[0] == '#') {
buffer_start = strchr(buffer_start, '\n');
if (buffer_start == NULL) {
error = GIT_EPACKEDREFSCORRUPTED;
goto cleanup;
}
buffer_start++;
}
while (buffer_start < buffer_end) {
reference_oid *ref = NULL;
error = packed_parse_oid(&ref, repo, &buffer_start, buffer_end);
if (error < GIT_SUCCESS)
goto cleanup;
if (buffer_start[0] == '^') {
error = packed_parse_peel(ref, &buffer_start, buffer_end);
if (error < GIT_SUCCESS)
goto cleanup;
}
error = git_hashtable_insert(ref_cache->packfile, ref->ref.name, ref);
if (error < GIT_SUCCESS) {
reference_free((git_reference *)ref);
goto cleanup;
}
}
git_futils_freebuffer(&packfile);
return GIT_SUCCESS;
cleanup:
git_hashtable_free(ref_cache->packfile);
ref_cache->packfile = NULL;
git_futils_freebuffer(&packfile);
return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to load packed references");
}
struct dirent_list_data {
git_repository *repo;
size_t repo_path_len;
unsigned int list_flags;
int (*callback)(const char *, void *);
void *callback_payload;
};
static int _dirent_loose_listall(void *_data, char *full_path)
{
struct dirent_list_data *data = (struct dirent_list_data *)_data;
char *file_path = full_path + data->repo_path_len;
if (git_futils_isdir(full_path) == GIT_SUCCESS)
return git_futils_direach(full_path, GIT_PATH_MAX, _dirent_loose_listall, _data);
/* do not add twice a reference that exists already in the packfile */
if ((data->list_flags & GIT_REF_PACKED) != 0 &&
git_hashtable_lookup(data->repo->references.packfile, file_path) != NULL)
return GIT_SUCCESS;
if (data->list_flags != GIT_REF_LISTALL) {
if ((data->list_flags & loose_guess_rtype(full_path)) == 0)
return GIT_SUCCESS; /* we are filtering out this reference */
}
return data->callback(file_path, data->callback_payload);
}
static int _dirent_loose_load(void *data, char *full_path)
{
git_repository *repository = (git_repository *)data;
git_reference *reference;
void *old_ref = NULL;
char *file_path;
int error;
if (git_futils_isdir(full_path) == GIT_SUCCESS)
return git_futils_direach(full_path, GIT_PATH_MAX, _dirent_loose_load, repository);
file_path = full_path + strlen(repository->path_repository);
error = loose_lookup(&reference, repository, file_path, 1);
if (error == GIT_SUCCESS && reference != NULL) {
reference->type |= GIT_REF_PACKED;
if (git_hashtable_insert2(repository->references.packfile, reference->name, reference, &old_ref) < GIT_SUCCESS) {
reference_free(reference);
return GIT_ENOMEM;
}
if (old_ref != NULL)
reference_free((git_reference *)old_ref);
}
return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to load loose dirent");
}
/*
* Load all the loose references from the repository
* into the in-memory Packfile, and build a vector with
* all the references so it can be written back to
* disk.
*/
static int packed_loadloose(git_repository *repository)
{
char refs_path[GIT_PATH_MAX];
/* the packfile must have been previously loaded! */
assert(repository->references.packfile);
git_path_join(refs_path, repository->path_repository, GIT_REFS_DIR);
/* Remove any loose references from the cache */
{
const void *GIT_UNUSED(_unused);
git_reference *reference;
GIT_HASHTABLE_FOREACH(repository->references.loose_cache, _unused, reference,
reference_free(reference);
);
}
git_hashtable_clear(repository->references.loose_cache);
/*
* Load all the loose files from disk into the Packfile table.
* This will overwrite any old packed entries with their
* updated loose versions
*/
return git_futils_direach(refs_path, GIT_PATH_MAX, _dirent_loose_load, repository);
}
/*
* Write a single reference into a packfile
*/
static int packed_write_ref(reference_oid *ref, git_filebuf *file)
{
int error;
char oid[GIT_OID_HEXSZ + 1];
git_oid_fmt(oid, &ref->oid);
oid[GIT_OID_HEXSZ] = 0;
/*
* For references that peel to an object in the repo, we must
* write the resulting peel on a separate line, e.g.
*
* 6fa8a902cc1d18527e1355773c86721945475d37 refs/tags/libgit2-0.4
* ^2ec0cb7959b0bf965d54f95453f5b4b34e8d3100
*
* This obviously only applies to tags.
* The required peels have already been loaded into `ref->peel_target`.
*/
if (ref->ref.type & GIT_REF_HAS_PEEL) {
char peel[GIT_OID_HEXSZ + 1];
git_oid_fmt(peel, &ref->peel_target);
peel[GIT_OID_HEXSZ] = 0;
error = git_filebuf_printf(file, "%s %s\n^%s\n", oid, ref->ref.name, peel);
} else {
error = git_filebuf_printf(file, "%s %s\n", oid, ref->ref.name);
}
return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to write packed reference");
}
/*
* Find out what object this reference resolves to.
*
* For references that point to a 'big' tag (e.g. an
* actual tag object on the repository), we need to
* cache on the packfile the OID of the object to
* which that 'big tag' is pointing to.
*/
static int packed_find_peel(reference_oid *ref)
{
git_object *object;
int error;
if (ref->ref.type & GIT_REF_HAS_PEEL)
return GIT_SUCCESS;
/*
* Only applies to tags, i.e. references
* in the /refs/tags folder
*/
if (git__prefixcmp(ref->ref.name, GIT_REFS_TAGS_DIR) != 0)
return GIT_SUCCESS;
/*
* Find the tagged object in the repository
*/
error = git_object_lookup(&object, ref->ref.owner, &ref->oid, GIT_OBJ_ANY);
if (error < GIT_SUCCESS)
return git__throw(GIT_EOBJCORRUPTED, "Failed to find packed reference");
/*
* If the tagged object is a Tag object, we need to resolve it;
* if the ref is actually a 'weak' ref, we don't need to resolve
* anything.
*/
if (git_object_type(object) == GIT_OBJ_TAG) {
git_tag *tag = (git_tag *)object;
/*
* Find the object pointed at by this tag
*/
git_oid_cpy(&ref->peel_target, git_tag_target_oid(tag));
ref->ref.type |= GIT_REF_HAS_PEEL;
/*
* The reference has now cached the resolved OID, and is
* marked at such. When written to the packfile, it'll be
* accompanied by this resolved oid
*/
}
git_object_close(object);
return GIT_SUCCESS;
}
/*
* Remove all loose references
*
* Once we have successfully written a packfile,
* all the loose references that were packed must be
* removed from disk.
*
* This is a dangerous method; make sure the packfile
* is well-written, because we are destructing references
* here otherwise.
*/
static int packed_remove_loose(git_repository *repo, git_vector *packing_list)
{
unsigned int i;
char full_path[GIT_PATH_MAX];
int error = GIT_SUCCESS;
git_reference *reference;
for (i = 0; i < packing_list->length; ++i) {
git_reference *ref = git_vector_get(packing_list, i);
/* Ensure the packed reference doesn't exist
* in a (more up-to-date?) state as a loose reference
*/
reference = git_hashtable_lookup(ref->owner->references.loose_cache, ref->name);
if (reference != NULL)
continue;
git_path_join(full_path, repo->path_repository, ref->name);
if (git_futils_exists(full_path) == GIT_SUCCESS &&
p_unlink(full_path) < GIT_SUCCESS)
error = GIT_EOSERR;
/*
* if we fail to remove a single file, this is *not* good,
* but we should keep going and remove as many as possible.
* After we've removed as many files as possible, we return
* the error code anyway.
*
* TODO: mark this with a very special error code?
* GIT_EFAILTORMLOOSE
*/
}
return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to remove loose packed reference");
}
static int packed_sort(const void *a, const void *b)
{
const git_reference *ref_a = (const git_reference *)a;
const git_reference *ref_b = (const git_reference *)b;
return strcmp(ref_a->name, ref_b->name);
}
/*
* Write all the contents in the in-memory packfile to disk.
*/
static int packed_write(git_repository *repo)
{
git_filebuf pack_file;
int error;
unsigned int i;
char pack_file_path[GIT_PATH_MAX];
git_vector packing_list;
size_t total_refs;
assert(repo && repo->references.packfile);
total_refs = repo->references.packfile->key_count;
if ((error = git_vector_init(&packing_list, total_refs, packed_sort)) < GIT_SUCCESS)
return git__rethrow(error, "Failed to write packed reference");
/* Load all the packfile into a vector */
{
git_reference *reference;
const void *GIT_UNUSED(_unused);
GIT_HASHTABLE_FOREACH(repo->references.packfile, _unused, reference,
git_vector_insert(&packing_list, reference); /* cannot fail: vector already has the right size */
);
}
/* sort the vector so the entries appear sorted on the packfile */
git_vector_sort(&packing_list);
/* Now we can open the file! */
git_path_join(pack_file_path, repo->path_repository, GIT_PACKEDREFS_FILE);
if ((error = git_filebuf_open(&pack_file, pack_file_path, 0)) < GIT_SUCCESS)
return git__rethrow(error, "Failed to write packed reference");
/* Packfiles have a header... apparently
* This is in fact not required, but we might as well print it
* just for kicks */
if ((error = git_filebuf_printf(&pack_file, "%s\n", GIT_PACKEDREFS_HEADER)) < GIT_SUCCESS)
return git__rethrow(error, "Failed to write packed reference");
for (i = 0; i < packing_list.length; ++i) {
reference_oid *ref = (reference_oid *)git_vector_get(&packing_list, i);
/* only direct references go to the packfile; otherwise
* this is a disaster */
assert(ref->ref.type & GIT_REF_OID);
if ((error = packed_find_peel(ref)) < GIT_SUCCESS) {
error = git__throw(GIT_EOBJCORRUPTED, "A reference cannot be peeled");
goto cleanup;
}
if ((error = packed_write_ref(ref, &pack_file)) < GIT_SUCCESS)
goto cleanup;
}
cleanup:
/* if we've written all the references properly, we can commit
* the packfile to make the changes effective */
if (error == GIT_SUCCESS) {
error = git_filebuf_commit(&pack_file);
/* when and only when the packfile has been properly written,
* we can go ahead and remove the loose refs */
if (error == GIT_SUCCESS) {
struct stat st;
error = packed_remove_loose(repo, &packing_list);
if (p_stat(pack_file_path, &st) == GIT_SUCCESS)
repo->references.packfile_time = st.st_mtime;
}
}
else git_filebuf_cleanup(&pack_file);
git_vector_free(&packing_list);
return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to write packed reference");
}
static int _reference_available_cb(const char *ref, void *data)
{
const char *new, *old;
git_vector *refs;
assert(ref && data);
refs = (git_vector *)data;
new = (const char *)git_vector_get(refs, 0);
old = (const char *)git_vector_get(refs, 1);
if (!old || strcmp(old, ref)) {
int reflen = strlen(ref);
int newlen = strlen(new);
int cmplen = reflen < newlen ? reflen : newlen;
const char *lead = reflen < newlen ? new : ref;
if (!strncmp(new, ref, cmplen) &&
lead[cmplen] == '/')
return GIT_EEXISTS;
}
return GIT_SUCCESS;
}
static int reference_available(git_repository *repo, const char *ref, const char* old_ref)
{
int error;
git_vector refs;
if (git_vector_init(&refs, 2, NULL) < GIT_SUCCESS)
return GIT_ENOMEM;
git_vector_insert(&refs, (void *)ref);
git_vector_insert(&refs, (void *)old_ref);
error = git_reference_foreach(repo, GIT_REF_LISTALL, _reference_available_cb, (void *)&refs);
git_vector_free(&refs);
return error == GIT_SUCCESS ? GIT_SUCCESS : git__throw(GIT_EEXISTS, "Reference name `%s` conflicts with existing reference", ref);
}
/*****************************************
* External Library API
*****************************************/
/**
* Constructors
*/
int git_reference_lookup(git_reference **ref_out, git_repository *repo, const char *name)
{
int error;
char normalized_name[GIT_REFNAME_MAX];
assert(ref_out && repo && name);
*ref_out = NULL;
error = normalize_name(normalized_name, sizeof(normalized_name), name, 0);
if (error < GIT_SUCCESS)
return git__rethrow(error, "Failed to lookup reference");
/* First, check has been previously loaded and cached */
*ref_out = git_hashtable_lookup(repo->references.loose_cache, normalized_name);
if (*ref_out != NULL)
return loose_update(*ref_out);
/* Then check if there is a loose file for that reference.*/
error = loose_lookup(ref_out, repo, normalized_name, 0);
/* If the file exists, we store it on the cache */
if (error == GIT_SUCCESS)
return git_hashtable_insert(repo->references.loose_cache, (*ref_out)->name, (*ref_out));
/* The loose lookup has failed, but not because the reference wasn't found;
* probably the loose reference is corrupted. this is bad. */
if (error != GIT_ENOTFOUND)
return git__rethrow(error, "Failed to lookup reference");
/*
* If we cannot find a loose reference, we look into the packfile
* Load the packfile first if it hasn't been loaded
*/
/* load all the packed references */
error = packed_load(repo);
if (error < GIT_SUCCESS)
return git__rethrow(error, "Failed to lookup reference");
/* Look up on the packfile */
*ref_out = git_hashtable_lookup(repo->references.packfile, normalized_name);
if (*ref_out != NULL)
return GIT_SUCCESS;
/* The reference doesn't exist anywhere */
return git__throw(GIT_ENOTFOUND, "Failed to lookup reference. Reference doesn't exist");
}
/**
* Getters
*/
git_rtype git_reference_type(git_reference *ref)
{
assert(ref);
if (ref->type & GIT_REF_OID)
return GIT_REF_OID;
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