| /* |
| * Copyright (C) 2009-2012 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 "pack.h" |
| #include "reflog.h" |
| |
| #include <git2/tag.h> |
| #include <git2/object.h> |
| |
| GIT__USE_STRMAP; |
| |
| #define DEFAULT_NESTING_LEVEL 5 |
| #define MAX_NESTING_LEVEL 10 |
| |
| enum { |
| GIT_PACKREF_HAS_PEEL = 1, |
| GIT_PACKREF_WAS_LOOSE = 2 |
| }; |
| |
| struct packref { |
| git_oid oid; |
| git_oid peel; |
| char flags; |
| char name[GIT_FLEX_ARRAY]; |
| }; |
| |
| static int reference_read( |
| git_buf *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_buf *file_content); |
| static int loose_parse_oid(git_oid *ref, git_buf *file_content); |
| static int loose_lookup(git_reference *ref); |
| static int loose_lookup_to_packfile(struct packref **ref_out, |
| git_repository *repo, const char *name); |
| static int loose_write(git_reference *ref); |
| |
| /* packed refs */ |
| static int packed_parse_peel(struct packref *tag_ref, |
| const char **buffer_out, const char *buffer_end); |
| static int packed_parse_oid(struct packref **ref_out, |
| 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(struct packref *ref, git_filebuf *file); |
| static int packed_find_peel(git_repository *repo, struct packref *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_lookup(git_reference *ref); |
| static int packed_write(git_repository *repo); |
| |
| /* internal helpers */ |
| static int reference_path_available(git_repository *repo, |
| const char *ref, const char *old_ref); |
| static int reference_delete(git_reference *ref); |
| static int reference_lookup(git_reference *ref); |
| |
| /* name normalization */ |
| static int normalize_name(char *buffer_out, size_t out_size, |
| const char *name, int is_oid_ref); |
| |
| |
| void git_reference_free(git_reference *reference) |
| { |
| if (reference == NULL) |
| return; |
| |
| git__free(reference->name); |
| reference->name = NULL; |
| |
| if (reference->flags & GIT_REF_SYMBOLIC) { |
| git__free(reference->target.symbolic); |
| reference->target.symbolic = NULL; |
| } |
| |
| git__free(reference); |
| } |
| |
| static int reference_alloc( |
| git_reference **ref_out, |
| git_repository *repo, |
| const char *name) |
| { |
| git_reference *reference = NULL; |
| |
| assert(ref_out && repo && name); |
| |
| reference = git__malloc(sizeof(git_reference)); |
| GITERR_CHECK_ALLOC(reference); |
| |
| memset(reference, 0x0, sizeof(git_reference)); |
| reference->owner = repo; |
| |
| reference->name = git__strdup(name); |
| GITERR_CHECK_ALLOC(reference->name); |
| |
| *ref_out = reference; |
| return 0; |
| } |
| |
| static int reference_read( |
| git_buf *file_content, |
| time_t *mtime, |
| const char *repo_path, |
| const char *ref_name, |
| int *updated) |
| { |
| git_buf path = GIT_BUF_INIT; |
| int result; |
| |
| assert(file_content && repo_path && ref_name); |
| |
| /* Determine the full path of the file */ |
| if (git_buf_joinpath(&path, repo_path, ref_name) < 0) |
| return -1; |
| |
| result = git_futils_readbuffer_updated(file_content, path.ptr, mtime, updated); |
| git_buf_free(&path); |
| return result; |
| } |
| |
| static int loose_parse_symbolic(git_reference *ref, git_buf *file_content) |
| { |
| const unsigned int header_len = (unsigned int)strlen(GIT_SYMREF); |
| const char *refname_start; |
| char *eol; |
| |
| refname_start = (const char *)file_content->ptr; |
| |
| if (git_buf_len(file_content) < header_len + 1) |
| goto corrupt; |
| |
| /* |
| * Assume we have already checked for the header |
| * before calling this function |
| */ |
| refname_start += header_len; |
| |
| ref->target.symbolic = git__strdup(refname_start); |
| GITERR_CHECK_ALLOC(ref->target.symbolic); |
| |
| /* remove newline at the end of file */ |
| eol = strchr(ref->target.symbolic, '\n'); |
| if (eol == NULL) |
| goto corrupt; |
| |
| *eol = '\0'; |
| if (eol[-1] == '\r') |
| eol[-1] = '\0'; |
| |
| return 0; |
| |
| corrupt: |
| giterr_set(GITERR_REFERENCE, "Corrupted loose reference file"); |
| return -1; |
| } |
| |
| static int loose_parse_oid(git_oid *oid, git_buf *file_content) |
| { |
| char *buffer; |
| |
| buffer = (char *)file_content->ptr; |
| |
| /* File format: 40 chars (OID) + newline */ |
| if (git_buf_len(file_content) < GIT_OID_HEXSZ + 1) |
| goto corrupt; |
| |
| if (git_oid_fromstr(oid, buffer) < 0) |
| goto corrupt; |
| |
| buffer = buffer + GIT_OID_HEXSZ; |
| if (*buffer == '\r') |
| buffer++; |
| |
| if (*buffer != '\n') |
| goto corrupt; |
| |
| return 0; |
| |
| corrupt: |
| giterr_set(GITERR_REFERENCE, "Corrupted loose reference file"); |
| return -1; |
| } |
| |
| static git_ref_t loose_guess_rtype(const git_buf *full_path) |
| { |
| git_buf ref_file = GIT_BUF_INIT; |
| git_ref_t type; |
| |
| type = GIT_REF_INVALID; |
| |
| if (git_futils_readbuffer(&ref_file, full_path->ptr) == 0) { |
| if (git__prefixcmp((const char *)(ref_file.ptr), GIT_SYMREF) == 0) |
| type = GIT_REF_SYMBOLIC; |
| else |
| type = GIT_REF_OID; |
| } |
| |
| git_buf_free(&ref_file); |
| return type; |
| } |
| |
| static int loose_lookup(git_reference *ref) |
| { |
| int result, updated; |
| git_buf ref_file = GIT_BUF_INIT; |
| |
| result = reference_read(&ref_file, &ref->mtime, |
| ref->owner->path_repository, ref->name, &updated); |
| |
| if (result < 0) |
| return result; |
| |
| if (!updated) |
| return 0; |
| |
| if (ref->flags & GIT_REF_SYMBOLIC) { |
| git__free(ref->target.symbolic); |
| ref->target.symbolic = NULL; |
| } |
| |
| ref->flags = 0; |
| |
| if (git__prefixcmp((const char *)(ref_file.ptr), GIT_SYMREF) == 0) { |
| ref->flags |= GIT_REF_SYMBOLIC; |
| result = loose_parse_symbolic(ref, &ref_file); |
| } else { |
| ref->flags |= GIT_REF_OID; |
| result = loose_parse_oid(&ref->target.oid, &ref_file); |
| } |
| |
| git_buf_free(&ref_file); |
| return result; |
| } |
| |
| static int loose_lookup_to_packfile( |
| struct packref **ref_out, |
| git_repository *repo, |
| const char *name) |
| { |
| git_buf ref_file = GIT_BUF_INIT; |
| struct packref *ref = NULL; |
| size_t name_len; |
| |
| *ref_out = NULL; |
| |
| if (reference_read(&ref_file, NULL, repo->path_repository, name, NULL) < 0) |
| return -1; |
| |
| name_len = strlen(name); |
| ref = git__malloc(sizeof(struct packref) + name_len + 1); |
| GITERR_CHECK_ALLOC(ref); |
| |
| memcpy(ref->name, name, name_len); |
| ref->name[name_len] = 0; |
| |
| if (loose_parse_oid(&ref->oid, &ref_file) < 0) { |
| git_buf_free(&ref_file); |
| git__free(ref); |
| return -1; |
| } |
| |
| ref->flags = GIT_PACKREF_WAS_LOOSE; |
| |
| *ref_out = ref; |
| git_buf_free(&ref_file); |
| return 0; |
| } |
| |
| static int loose_write(git_reference *ref) |
| { |
| git_filebuf file = GIT_FILEBUF_INIT; |
| git_buf ref_path = GIT_BUF_INIT; |
| struct stat st; |
| |
| if (git_buf_joinpath(&ref_path, ref->owner->path_repository, ref->name) < 0) |
| return -1; |
| |
| /* Remove a possibly existing empty directory hierarchy |
| * which name would collide with the reference name |
| */ |
| if (git_path_isdir(git_buf_cstr(&ref_path)) && |
| (git_futils_rmdir_r(git_buf_cstr(&ref_path), GIT_DIRREMOVAL_ONLY_EMPTY_DIRS) < 0)) { |
| git_buf_free(&ref_path); |
| return -1; |
| } |
| |
| if (git_filebuf_open(&file, ref_path.ptr, GIT_FILEBUF_FORCE) < 0) { |
| git_buf_free(&ref_path); |
| return -1; |
| } |
| |
| git_buf_free(&ref_path); |
| |
| if (ref->flags & GIT_REF_OID) { |
| char oid[GIT_OID_HEXSZ + 1]; |
| |
| git_oid_fmt(oid, &ref->target.oid); |
| oid[GIT_OID_HEXSZ] = '\0'; |
| |
| git_filebuf_printf(&file, "%s\n", oid); |
| |
| } else if (ref->flags & GIT_REF_SYMBOLIC) { |
| git_filebuf_printf(&file, GIT_SYMREF "%s\n", ref->target.symbolic); |
| } else { |
| assert(0); /* don't let this happen */ |
| } |
| |
| if (p_stat(ref_path.ptr, &st) == 0) |
| ref->mtime = st.st_mtime; |
| |
| return git_filebuf_commit(&file, GIT_REFS_FILE_MODE); |
| } |
| |
| static int packed_parse_peel( |
| struct packref *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) |
| goto corrupt; |
| |
| /* Ensure reference is a tag */ |
| if (git__prefixcmp(tag_ref->name, GIT_REFS_TAGS_DIR) != 0) |
| goto corrupt; |
| |
| if (buffer + GIT_OID_HEXSZ >= buffer_end) |
| goto corrupt; |
| |
| /* Is this a valid object id? */ |
| if (git_oid_fromstr(&tag_ref->peel, buffer) < 0) |
| goto corrupt; |
| |
| buffer = buffer + GIT_OID_HEXSZ; |
| if (*buffer == '\r') |
| buffer++; |
| |
| if (*buffer != '\n') |
| goto corrupt; |
| |
| *buffer_out = buffer + 1; |
| return 0; |
| |
| corrupt: |
| giterr_set(GITERR_REFERENCE, "The packed references file is corrupted"); |
| return -1; |
| } |
| |
| static int packed_parse_oid( |
| struct packref **ref_out, |
| const char **buffer_out, |
| const char *buffer_end) |
| { |
| struct packref *ref = NULL; |
| |
| const char *buffer = *buffer_out; |
| const char *refname_begin, *refname_end; |
| |
| size_t refname_len; |
| git_oid id; |
| |
| refname_begin = (buffer + GIT_OID_HEXSZ + 1); |
| if (refname_begin >= buffer_end || refname_begin[-1] != ' ') |
| goto corrupt; |
| |
| /* Is this a valid object id? */ |
| if (git_oid_fromstr(&id, buffer) < 0) |
| goto corrupt; |
| |
| refname_end = memchr(refname_begin, '\n', buffer_end - refname_begin); |
| if (refname_end == NULL) |
| goto corrupt; |
| |
| if (refname_end[-1] == '\r') |
| refname_end--; |
| |
| refname_len = refname_end - refname_begin; |
| |
| ref = git__malloc(sizeof(struct packref) + refname_len + 1); |
| GITERR_CHECK_ALLOC(ref); |
| |
| memcpy(ref->name, refname_begin, refname_len); |
| ref->name[refname_len] = 0; |
| |
| git_oid_cpy(&ref->oid, &id); |
| |
| ref->flags = 0; |
| |
| *ref_out = ref; |
| *buffer_out = refname_end + 1; |
| |
| return 0; |
| |
| corrupt: |
| git__free(ref); |
| giterr_set(GITERR_REFERENCE, "The packed references file is corrupted"); |
| return -1; |
| } |
| |
| static int packed_load(git_repository *repo) |
| { |
| int result, updated; |
| git_buf packfile = GIT_BUF_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_strmap_alloc(); |
| GITERR_CHECK_ALLOC(ref_cache->packfile); |
| } |
| |
| result = 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 (result == GIT_ENOTFOUND) { |
| git_strmap_clear(ref_cache->packfile); |
| return 0; |
| } |
| |
| if (result < 0) |
| return -1; |
| |
| if (!updated) |
| return 0; |
| |
| /* |
| * At this point, we want to refresh the packed refs. We already |
| * have the contents in our buffer. |
| */ |
| git_strmap_clear(ref_cache->packfile); |
| |
| buffer_start = (const char *)packfile.ptr; |
| buffer_end = (const char *)(buffer_start) + packfile.size; |
| |
| while (buffer_start < buffer_end && buffer_start[0] == '#') { |
| buffer_start = strchr(buffer_start, '\n'); |
| if (buffer_start == NULL) |
| goto parse_failed; |
| |
| buffer_start++; |
| } |
| |
| while (buffer_start < buffer_end) { |
| int err; |
| struct packref *ref = NULL; |
| |
| if (packed_parse_oid(&ref, &buffer_start, buffer_end) < 0) |
| goto parse_failed; |
| |
| if (buffer_start[0] == '^') { |
| if (packed_parse_peel(ref, &buffer_start, buffer_end) < 0) |
| goto parse_failed; |
| } |
| |
| git_strmap_insert(ref_cache->packfile, ref->name, ref, err); |
| if (err < 0) |
| goto parse_failed; |
| } |
| |
| git_buf_free(&packfile); |
| return 0; |
| |
| parse_failed: |
| git_strmap_free(ref_cache->packfile); |
| ref_cache->packfile = NULL; |
| git_buf_free(&packfile); |
| return -1; |
| } |
| |
| |
| 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, git_buf *full_path) |
| { |
| struct dirent_list_data *data = (struct dirent_list_data *)_data; |
| const char *file_path = full_path->ptr + data->repo_path_len; |
| |
| if (git_path_isdir(full_path->ptr) == true) |
| return git_path_direach(full_path, _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_strmap_exists(data->repo->references.packfile, file_path)) |
| return 0; |
| |
| if (data->list_flags != GIT_REF_LISTALL) { |
| if ((data->list_flags & loose_guess_rtype(full_path)) == 0) |
| return 0; /* we are filtering out this reference */ |
| } |
| |
| return data->callback(file_path, data->callback_payload); |
| } |
| |
| static int _dirent_loose_load(void *data, git_buf *full_path) |
| { |
| git_repository *repository = (git_repository *)data; |
| void *old_ref = NULL; |
| struct packref *ref; |
| const char *file_path; |
| int err; |
| |
| if (git_path_isdir(full_path->ptr) == true) |
| return git_path_direach(full_path, _dirent_loose_load, repository); |
| |
| file_path = full_path->ptr + strlen(repository->path_repository); |
| |
| if (loose_lookup_to_packfile(&ref, repository, file_path) < 0) |
| return -1; |
| |
| git_strmap_insert2( |
| repository->references.packfile, ref->name, ref, old_ref, err); |
| if (err < 0) { |
| git__free(ref); |
| return -1; |
| } |
| |
| git__free(old_ref); |
| return 0; |
| } |
| |
| /* |
| * 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) |
| { |
| git_buf refs_path = GIT_BUF_INIT; |
| int result; |
| |
| /* the packfile must have been previously loaded! */ |
| assert(repository->references.packfile); |
| |
| if (git_buf_joinpath(&refs_path, repository->path_repository, GIT_REFS_DIR) < 0) |
| return -1; |
| |
| /* |
| * Load all the loose files from disk into the Packfile table. |
| * This will overwrite any old packed entries with their |
| * updated loose versions |
| */ |
| result = git_path_direach(&refs_path, _dirent_loose_load, repository); |
| git_buf_free(&refs_path); |
| |
| return result; |
| } |
| |
| /* |
| * Write a single reference into a packfile |
| */ |
| static int packed_write_ref(struct packref *ref, git_filebuf *file) |
| { |
| 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->flags & GIT_PACKREF_HAS_PEEL) { |
| char peel[GIT_OID_HEXSZ + 1]; |
| git_oid_fmt(peel, &ref->peel); |
| peel[GIT_OID_HEXSZ] = 0; |
| |
| if (git_filebuf_printf(file, "%s %s\n^%s\n", oid, ref->name, peel) < 0) |
| return -1; |
| } else { |
| if (git_filebuf_printf(file, "%s %s\n", oid, ref->name) < 0) |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * 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(git_repository *repo, struct packref *ref) |
| { |
| git_object *object; |
| |
| if (ref->flags & GIT_PACKREF_HAS_PEEL) |
| return 0; |
| |
| /* |
| * Only applies to tags, i.e. references |
| * in the /refs/tags folder |
| */ |
| if (git__prefixcmp(ref->name, GIT_REFS_TAGS_DIR) != 0) |
| return 0; |
| |
| /* |
| * Find the tagged object in the repository |
| */ |
| if (git_object_lookup(&object, repo, &ref->oid, GIT_OBJ_ANY) < 0) |
| return -1; |
| |
| /* |
| * 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, git_tag_target_oid(tag)); |
| ref->flags |= GIT_PACKREF_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_free(object); |
| return 0; |
| } |
| |
| /* |
| * 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; |
| git_buf full_path = GIT_BUF_INIT; |
| int failed = 0; |
| |
| for (i = 0; i < packing_list->length; ++i) { |
| struct packref *ref = git_vector_get(packing_list, i); |
| |
| if ((ref->flags & GIT_PACKREF_WAS_LOOSE) == 0) |
| continue; |
| |
| if (git_buf_joinpath(&full_path, repo->path_repository, ref->name) < 0) |
| return -1; /* critical; do not try to recover on oom */ |
| |
| if (git_path_exists(full_path.ptr) == true && p_unlink(full_path.ptr) < 0) { |
| if (failed) |
| continue; |
| |
| giterr_set(GITERR_REFERENCE, |
| "Failed to remove loose reference '%s' after packing: %s", |
| full_path.ptr, strerror(errno)); |
| |
| failed = 1; |
| } |
| |
| /* |
| * 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. |
| */ |
| } |
| |
| git_buf_free(&full_path); |
| return failed ? -1 : 0; |
| } |
| |
| static int packed_sort(const void *a, const void *b) |
| { |
| const struct packref *ref_a = (const struct packref *)a; |
| const struct packref *ref_b = (const struct packref *)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 = GIT_FILEBUF_INIT; |
| unsigned int i; |
| git_buf pack_file_path = GIT_BUF_INIT; |
| git_vector packing_list; |
| unsigned int total_refs; |
| |
| assert(repo && repo->references.packfile); |
| |
| total_refs = |
| (unsigned int)git_strmap_num_entries(repo->references.packfile); |
| |
| if (git_vector_init(&packing_list, total_refs, packed_sort) < 0) |
| return -1; |
| |
| /* Load all the packfile into a vector */ |
| { |
| struct packref *reference; |
| |
| /* cannot fail: vector already has the right size */ |
| git_strmap_foreach_value(repo->references.packfile, reference, { |
| git_vector_insert(&packing_list, reference); |
| }); |
| } |
| |
| /* sort the vector so the entries appear sorted on the packfile */ |
| git_vector_sort(&packing_list); |
| |
| /* Now we can open the file! */ |
| if (git_buf_joinpath(&pack_file_path, repo->path_repository, GIT_PACKEDREFS_FILE) < 0) |
| goto cleanup_memory; |
| |
| if (git_filebuf_open(&pack_file, pack_file_path.ptr, 0) < 0) |
| goto cleanup_packfile; |
| |
| /* Packfiles have a header... apparently |
| * This is in fact not required, but we might as well print it |
| * just for kicks */ |
| if (git_filebuf_printf(&pack_file, "%s\n", GIT_PACKEDREFS_HEADER) < 0) |
| goto cleanup_packfile; |
| |
| for (i = 0; i < packing_list.length; ++i) { |
| struct packref *ref = (struct packref *)git_vector_get(&packing_list, i); |
| |
| if (packed_find_peel(repo, ref) < 0) |
| goto cleanup_packfile; |
| |
| if (packed_write_ref(ref, &pack_file) < 0) |
| goto cleanup_packfile; |
| } |
| |
| /* if we've written all the references properly, we can commit |
| * the packfile to make the changes effective */ |
| if (git_filebuf_commit(&pack_file, GIT_PACKEDREFS_FILE_MODE) < 0) |
| goto cleanup_memory; |
| |
| /* when and only when the packfile has been properly written, |
| * we can go ahead and remove the loose refs */ |
| if (packed_remove_loose(repo, &packing_list) < 0) |
| goto cleanup_memory; |
| |
| { |
| struct stat st; |
| if (p_stat(pack_file_path.ptr, &st) == 0) |
| repo->references.packfile_time = st.st_mtime; |
| } |
| |
| git_vector_free(&packing_list); |
| git_buf_free(&pack_file_path); |
| |
| /* we're good now */ |
| return 0; |
| |
| cleanup_packfile: |
| git_filebuf_cleanup(&pack_file); |
| |
| cleanup_memory: |
| git_vector_free(&packing_list); |
| git_buf_free(&pack_file_path); |
| |
| return -1; |
| } |
| |
| struct reference_available_t { |
| const char *new_ref; |
| const char *old_ref; |
| int available; |
| }; |
| |
| static int _reference_available_cb(const char *ref, void *data) |
| { |
| struct reference_available_t *d; |
| |
| assert(ref && data); |
| d = (struct reference_available_t *)data; |
| |
| if (!d->old_ref || strcmp(d->old_ref, ref)) { |
| size_t reflen = strlen(ref); |
| size_t newlen = strlen(d->new_ref); |
| size_t cmplen = reflen < newlen ? reflen : newlen; |
| const char *lead = reflen < newlen ? d->new_ref : ref; |
| |
| if (!strncmp(d->new_ref, ref, cmplen) && lead[cmplen] == '/') { |
| d->available = 0; |
| return -1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int reference_path_available( |
| git_repository *repo, |
| const char *ref, |
| const char* old_ref) |
| { |
| struct reference_available_t data; |
| |
| data.new_ref = ref; |
| data.old_ref = old_ref; |
| data.available = 1; |
| |
| if (git_reference_foreach(repo, GIT_REF_LISTALL, |
| _reference_available_cb, (void *)&data) < 0) |
| return -1; |
| |
| if (!data.available) { |
| giterr_set(GITERR_REFERENCE, |
| "The path to reference '%s' collides with an existing one", ref); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int reference_exists(int *exists, git_repository *repo, const char *ref_name) |
| { |
| git_buf ref_path = GIT_BUF_INIT; |
| |
| if (packed_load(repo) < 0) |
| return -1; |
| |
| if (git_buf_joinpath(&ref_path, repo->path_repository, ref_name) < 0) |
| return -1; |
| |
| if (git_path_isfile(ref_path.ptr) == true || |
| git_strmap_exists(repo->references.packfile, ref_path.ptr)) |
| { |
| *exists = 1; |
| } else { |
| *exists = 0; |
| } |
| |
| git_buf_free(&ref_path); |
| return 0; |
| } |
| |
| /* |
| * Check if a reference could be written to disk, based on: |
| * |
| * - Whether a reference with the same name already exists, |
| * and we are allowing or disallowing overwrites |
| * |
| * - Whether the name of the reference would collide with |
| * an existing path |
| */ |
| static int reference_can_write( |
| git_repository *repo, |
| const char *refname, |
| const char *previous_name, |
| int force) |
| { |
| /* see if the reference shares a path with an existing reference; |
| * if a path is shared, we cannot create the reference, even when forcing */ |
| if (reference_path_available(repo, refname, previous_name) < 0) |
| return -1; |
| |
| /* check if the reference actually exists, but only if we are not forcing |
| * the rename. If we are forcing, it's OK to overwrite */ |
| if (!force) { |
| int exists; |
| |
| if (reference_exists(&exists, repo, refname) < 0) |
| return -1; |
| |
| /* We cannot proceed if the reference already exists and we're not forcing |
| * the rename; the existing one would be overwritten */ |
| if (exists) { |
| giterr_set(GITERR_REFERENCE, |
| "A reference with that name (%s) already exists", refname); |
| return GIT_EEXISTS; |
| } |
| } |
| |
| /* FIXME: if the reference exists and we are forcing, do we really need to |
| * remove the reference first? |
| * |
| * Two cases: |
| * |
| * - the reference already exists and is loose: not a problem, the file |
| * gets overwritten on disk |
| * |
| * - the reference already exists and is packed: we write a new one as |
| * loose, which by all means renders the packed one useless |
| */ |
| |
| return 0; |
| } |
| |
| |
| static int packed_lookup(git_reference *ref) |
| { |
| struct packref *pack_ref = NULL; |
| git_strmap *packfile_refs; |
| khiter_t pos; |
| |
| if (packed_load(ref->owner) < 0) |
| return -1; |
| |
| /* maybe the packfile hasn't changed at all, so we don't |
| * have to re-lookup the reference */ |
| if ((ref->flags & GIT_REF_PACKED) && |
| ref->mtime == ref->owner->references.packfile_time) |
| return 0; |
| |
| if (ref->flags & GIT_REF_SYMBOLIC) { |
| git__free(ref->target.symbolic); |
| ref->target.symbolic = NULL; |
| } |
| |
| /* Look up on the packfile */ |
| packfile_refs = ref->owner->references.packfile; |
| pos = git_strmap_lookup_index(packfile_refs, ref->name); |
| if (!git_strmap_valid_index(packfile_refs, pos)) { |
| giterr_set(GITERR_REFERENCE, "Reference '%s' not found", ref->name); |
| return GIT_ENOTFOUND; |
| } |
| |
| pack_ref = git_strmap_value_at(packfile_refs, pos); |
| |
| ref->flags = GIT_REF_OID | GIT_REF_PACKED; |
| ref->mtime = ref->owner->references.packfile_time; |
| git_oid_cpy(&ref->target.oid, &pack_ref->oid); |
| |
| return 0; |
| } |
| |
| static int reference_lookup(git_reference *ref) |
| { |
| int result; |
| |
| result = loose_lookup(ref); |
| if (result == 0) |
| return 0; |
| |
| /* only try to lookup this reference on the packfile if it |
| * wasn't found on the loose refs; not if there was a critical error */ |
| if (result == GIT_ENOTFOUND) { |
| giterr_clear(); |
| result = packed_lookup(ref); |
| if (result == 0) |
| return 0; |
| } |
| |
| /* unexpected error; free the reference */ |
| git_reference_free(ref); |
| return result; |
| } |
| |
| /* |
| * Delete a reference. |
| * This is an internal method; the reference is removed |
| * from disk or the packfile, but the pointer is not freed |
| */ |
| static int reference_delete(git_reference *ref) |
| { |
| int result; |
| |
| assert(ref); |
| |
| /* If the reference is packed, this is an expensive operation. |
| * We need to reload the packfile, remove the reference from the |
| * packing list, and repack */ |
| if (ref->flags & GIT_REF_PACKED) { |
| git_strmap *packfile_refs; |
| struct packref *packref; |
| khiter_t pos; |
| |
| /* load the existing packfile */ |
| if (packed_load(ref->owner) < 0) |
| return -1; |
| |
| packfile_refs = ref->owner->references.packfile; |
| pos = git_strmap_lookup_index(packfile_refs, ref->name); |
| if (!git_strmap_valid_index(packfile_refs, pos)) { |
| giterr_set(GITERR_REFERENCE, |
| "Reference %s stopped existing in the packfile", ref->name); |
| return -1; |
| } |
| |
| packref = git_strmap_value_at(packfile_refs, pos); |
| git_strmap_delete_at(packfile_refs, pos); |
| |
| git__free(packref); |
| if (packed_write(ref->owner) < 0) |
| return -1; |
| |
| /* If the reference is loose, we can just remove the reference |
| * from the filesystem */ |
| } else { |
| git_reference *ref_in_pack; |
| git_buf full_path = GIT_BUF_INIT; |
| |
| if (git_buf_joinpath(&full_path, ref->owner->path_repository, ref->name) < 0) |
| return -1; |
| |
| result = p_unlink(full_path.ptr); |
| git_buf_free(&full_path); /* done with path at this point */ |
| |
| if (result < 0) { |
| giterr_set(GITERR_OS, "Failed to unlink '%s'", full_path.ptr); |
| return -1; |
| } |
| |
| /* When deleting a loose reference, we have to ensure that an older |
| * packed version of it doesn't exist */ |
| if (git_reference_lookup(&ref_in_pack, ref->owner, ref->name) == 0) { |
| assert((ref_in_pack->flags & GIT_REF_PACKED) != 0); |
| return git_reference_delete(ref_in_pack); |
| } |
| |
| giterr_clear(); |
| } |
| |
| return 0; |
| } |
| |
| int git_reference_delete(git_reference *ref) |
| { |
| int result = reference_delete(ref); |
| git_reference_free(ref); |
| return result; |
| } |
| |
| int git_reference_lookup(git_reference **ref_out, |
| git_repository *repo, const char *name) |
| { |
| return git_reference_lookup_resolved(ref_out, repo, name, 0); |
| } |
| |
| int git_reference_name_to_oid( |
| git_oid *out, git_repository *repo, const char *name) |
| { |
| int error; |
| git_reference *ref; |
| |
| if ((error = git_reference_lookup_resolved(&ref, repo, name, -1)) < 0) |
| return error; |
| |
| git_oid_cpy(out, git_reference_oid(ref)); |
| git_reference_free(ref); |
| return 0; |
| } |
| |
| int git_reference_lookup_resolved( |
| git_reference **ref_out, |
| git_repository *repo, |
| const char *name, |
| int max_nesting) |
| { |
| git_reference *scan; |
| int result, nesting; |
| |
| assert(ref_out && repo && name); |
| |
| *ref_out = NULL; |
| |
| if (max_nesting > MAX_NESTING_LEVEL) |
| max_nesting = MAX_NESTING_LEVEL; |
| else if (max_nesting < 0) |
| max_nesting = DEFAULT_NESTING_LEVEL; |
| |
| scan = git__calloc(1, sizeof(git_reference)); |
| GITERR_CHECK_ALLOC(scan); |
| |
| scan->name = git__calloc(GIT_REFNAME_MAX + 1, sizeof(char)); |
| GITERR_CHECK_ALLOC(scan->name); |
| |
| if ((result = normalize_name(scan->name, GIT_REFNAME_MAX, name, 0)) < 0) { |
| git_reference_free(scan); |
| return result; |
| } |
| |
| scan->target.symbolic = git__strdup(scan->name); |
| GITERR_CHECK_ALLOC(scan->target.symbolic); |
| |
| scan->owner = repo; |
| scan->flags = GIT_REF_SYMBOLIC; |
| |
| for (nesting = max_nesting; |
| nesting >= 0 && (scan->flags & GIT_REF_SYMBOLIC) != 0; |
| nesting--) |
| { |
| if (nesting != max_nesting) |
| strncpy(scan->name, scan->target.symbolic, GIT_REFNAME_MAX); |
| |
| scan->mtime = 0; |
| |
| if ((result = reference_lookup(scan)) < 0) |
| return result; /* lookup git_reference_free on scan already */ |
| } |
| |
| if ((scan->flags & GIT_REF_OID) == 0 && max_nesting != 0) { |
| giterr_set(GITERR_REFERENCE, |
| "Cannot resolve reference (>%u levels deep)", max_nesting); |
| git_reference_free(scan); |
| return -1; |
| } |
| |
| *ref_out = scan; |
| return 0; |
| } |
| |
| /** |
| * Getters |
| */ |
| git_ref_t git_reference_type(git_reference *ref) |
| { |
| assert(ref); |
| |
| if (ref->flags & GIT_REF_OID) |
| return GIT_REF_OID; |
| |
| if (ref->flags & GIT_REF_SYMBOLIC) |
| return GIT_REF_SYMBOLIC; |
| |
| return GIT_REF_INVALID; |
| } |
| |
| int git_reference_is_packed(git_reference *ref) |
| { |
| assert(ref); |
| return !!(ref->flags & GIT_REF_PACKED); |
| } |
| |
| const char *git_reference_name(git_reference *ref) |
| { |
| assert(ref); |
| return ref->name; |
| } |
| |
| git_repository *git_reference_owner(git_reference *ref) |
| { |
| assert(ref); |
| return ref->owner; |
| } |
| |
| const git_oid *git_reference_oid(git_reference *ref) |
| { |
| assert(ref); |
| |
| if ((ref->flags & GIT_REF_OID) == 0) |
| return NULL; |
| |
| return &ref->target.oid; |
| } |
| |
| const char *git_reference_target(git_reference *ref) |
| { |
| assert(ref); |
| |
| if ((ref->flags & GIT_REF_SYMBOLIC) == 0) |
| return NULL; |
| |
| return ref->target.symbolic; |
| } |
| |
| int git_reference_create_symbolic( |
| git_reference **ref_out, |
| git_repository *repo, |
| const char *name, |
| const char *target, |
| int force) |
| { |
| char normalized[GIT_REFNAME_MAX]; |
| git_reference *ref = NULL; |
| |
| if (normalize_name(normalized, sizeof(normalized), name, 0) < 0) |
| return -1; |
| |
| if (reference_can_write(repo, normalized, NULL, force) < 0) |
| return -1; |
| |
| if (reference_alloc(&ref, repo, normalized) < 0) |
| return -1; |
| |
| ref->flags |= GIT_REF_SYMBOLIC; |
| |
| /* set the target; this will normalize the name automatically |
| * and write the reference on disk */ |
| if (git_reference_set_target(ref, target) < 0) { |
| git_reference_free(ref); |
| return -1; |
| } |
| if (ref_out == NULL) { |
| git_reference_free(ref); |
| } else { |
| *ref_out = ref; |
| } |
| |
| return 0; |
| } |
| |
| int git_reference_create_oid( |
| git_reference **ref_out, |
| git_repository *repo, |
| const char *name, |
| const git_oid *id, |
| int force) |
| { |
| git_reference *ref = NULL; |
| char normalized[GIT_REFNAME_MAX]; |
| |
| if (normalize_name(normalized, sizeof(normalized), name, 1) < 0) |
| return -1; |
| |
| if (reference_can_write(repo, normalized, NULL, force) < 0) |
| return -1; |
| |
| if (reference_alloc(&ref, repo, name) < 0) |
| return -1; |
| |
| ref->flags |= GIT_REF_OID; |
| |
| /* set the oid; this will write the reference on disk */ |
| if (git_reference_set_oid(ref, id) < 0) { |
| git_reference_free(ref); |
| return -1; |
| } |
| |
| if (ref_out == NULL) { |
| git_reference_free(ref); |
| } else { |
| *ref_out = ref; |
| } |
| |
| return 0; |
| } |
| /* |
| * Change the OID target of a reference. |
| * |
| * For both loose and packed references, just change |
| * the oid in memory and (over)write the file in disk. |
| * |
| * We do not repack packed references because of performance |
| * reasons. |
| */ |
| int git_reference_set_oid(git_reference *ref, const git_oid *id) |
| { |
| git_odb *odb = NULL; |
| |
| if ((ref->flags & GIT_REF_OID) == 0) { |
| giterr_set(GITERR_REFERENCE, "Cannot set OID on symbolic reference"); |
| return -1; |
| } |
| |
| assert(ref->owner); |
| |
| if (git_repository_odb__weakptr(&odb, ref->owner) < 0) |
| return -1; |
| |
| /* Don't let the user create references to OIDs that |
| * don't exist in the ODB */ |
| if (!git_odb_exists(odb, id)) { |
| giterr_set(GITERR_REFERENCE, |
| "Target OID for the reference doesn't exist on the repository"); |
| return -1; |
| } |
| |
| /* Update the OID value on `ref` */ |
| git_oid_cpy(&ref->target.oid, id); |
| |
| /* Write back to disk */ |
| return loose_write(ref); |
| } |
| |
| /* |
| * Change the target of a symbolic reference. |
| * |
| * This is easy because symrefs cannot be inside |
| * a pack. We just change the target in memory |
| * and overwrite the file on disk. |
| */ |
| int git_reference_set_target(git_reference *ref, const char *target) |
| { |
| char normalized[GIT_REFNAME_MAX]; |
| |
| if ((ref->flags & GIT_REF_SYMBOLIC) == 0) { |
| giterr_set(GITERR_REFERENCE, |
| "Cannot set symbolic target on a direct reference"); |
| return -1; |
| } |
| |
| if (normalize_name(normalized, sizeof(normalized), target, 0)) |
| return -1; |
| |
| git__free(ref->target.symbolic); |
| ref->target.symbolic = git__strdup(normalized); |
| GITERR_CHECK_ALLOC(ref->target.symbolic); |
| |
| return loose_write(ref); |
| } |
| |
| int git_reference_rename(git_reference *ref, const char *new_name, int force) |
| { |
| int result; |
| git_buf aux_path = GIT_BUF_INIT; |
| char normalized[GIT_REFNAME_MAX]; |
| |
| const char *head_target = NULL; |
| git_reference *head = NULL; |
| |
| if (normalize_name(normalized, sizeof(normalized), |
| new_name, ref->flags & GIT_REF_OID) < 0) |
| return -1; |
| |
| if (reference_can_write(ref->owner, normalized, ref->name, force) < 0) |
| return -1; |
| |
| /* Initialize path now so we won't get an allocation failure once |
| * we actually start removing things. */ |
| if (git_buf_joinpath(&aux_path, ref->owner->path_repository, new_name) < 0) |
| return -1; |
| |
| /* |
| * Now delete the old ref and remove an possibly existing directory |
| * named `new_name`. Note that using the internal `reference_delete` |
| * method deletes the ref from disk but doesn't free the pointer, so |
| * we can still access the ref's attributes for creating the new one |
| */ |
| if (reference_delete(ref) < 0) |
| goto cleanup; |
| |
| /* |
| * Finally we can create the new reference. |
| */ |
| if (ref->flags & GIT_REF_SYMBOLIC) { |
| result = git_reference_create_symbolic( |
| NULL, ref->owner, new_name, ref->target.symbolic, force); |
| } else { |
| result = git_reference_create_oid( |
| NULL, ref->owner, new_name, &ref->target.oid, force); |
| } |
| |
| if (result < 0) |
| goto rollback; |
| |
| /* |
| * Check if we have to update HEAD. |
| */ |
| if (git_reference_lookup(&head, ref->owner, GIT_HEAD_FILE) < 0) { |
| giterr_set(GITERR_REFERENCE, |
| "Failed to update HEAD after renaming reference"); |
| goto cleanup; |
| } |
| |
| head_target = git_reference_target(head); |
| |
| if (head_target && !strcmp(head_target, ref->name)) { |
| if (git_reference_create_symbolic(&head, ref->owner, "HEAD", new_name, 1) < 0) { |
| giterr_set(GITERR_REFERENCE, |
| "Failed to update HEAD after renaming reference"); |
| goto cleanup; |
| } |
| } |
| |
| /* |
| * Rename the reflog file. |
| */ |
| if (git_buf_join_n(&aux_path, '/', 3, ref->owner->path_repository, GIT_REFLOG_DIR, ref->name) < 0) |
| goto cleanup; |
| |
| if (git_path_exists(aux_path.ptr) == true) { |
| if (git_reflog_rename(ref, new_name) < 0) |
| goto cleanup; |
| } else { |
| giterr_clear(); |
| } |
| |
| /* |
| * Change the name of the reference given by the user. |
| */ |
| git__free(ref->name); |
| ref->name = git__strdup(new_name); |
| |
| /* The reference is no longer packed */ |
| ref->flags &= ~GIT_REF_PACKED; |
| |
| git_reference_free(head); |
| git_buf_free(&aux_path); |
| return 0; |
| |
| cleanup: |
| git_reference_free(head); |
| git_buf_free(&aux_path); |
| return -1; |
| |
| rollback: |
| /* |
| * Try to create the old reference again, ignore failures |
| */ |
| if (ref->flags & GIT_REF_SYMBOLIC) |
| git_reference_create_symbolic( |
| NULL, ref->owner, ref->name, ref->target.symbolic, 0); |
| else |
| git_reference_create_oid( |
| NULL, ref->owner, ref->name, &ref->target.oid, 0); |
| |
| /* The reference is no longer packed */ |
| ref->flags &= ~GIT_REF_PACKED; |
| |
| git_buf_free(&aux_path); |
| return -1; |
| } |
| |
| int git_reference_resolve(git_reference **ref_out, git_reference *ref) |
| { |
| if (ref->flags & GIT_REF_OID) |
| return git_reference_lookup(ref_out, ref->owner, ref->name); |
| else |
| return git_reference_lookup_resolved(ref_out, ref->owner, ref->target.symbolic, -1); |
| } |
| |
| int git_reference_packall(git_repository *repo) |
| { |
| if (packed_load(repo) < 0 || /* load the existing packfile */ |
| packed_loadloose(repo) < 0 || /* add all the loose refs */ |
| packed_write(repo) < 0) /* write back to disk */ |
| return -1; |
| |
| return 0; |
| } |
| |
| int git_reference_foreach( |
| git_repository *repo, |
| unsigned int list_flags, |
| int (*callback)(const char *, void *), |
| void *payload) |
| { |
| int result; |
| struct dirent_list_data data; |
| git_buf refs_path = GIT_BUF_INIT; |
| |
| /* list all the packed references first */ |
| if (list_flags & GIT_REF_PACKED) { |
| const char *ref_name; |
| void *ref; |
| GIT_UNUSED(ref); |
| |
| if (packed_load(repo) < 0) |
| return -1; |
| |
| git_strmap_foreach(repo->references.packfile, ref_name, ref, { |
| if (callback(ref_name, payload) < 0) |
| return 0; |
| }); |
| } |
| |
| /* now list the loose references, trying not to |
| * duplicate the ref names already in the packed-refs file */ |
| |
| data.repo_path_len = strlen(repo->path_repository); |
| data.list_flags = list_flags; |
| data.repo = repo; |
| data.callback = callback; |
| data.callback_payload = payload; |
| |
| if (git_buf_joinpath(&refs_path, repo->path_repository, GIT_REFS_DIR) < 0) |
| return -1; |
| |
| result = git_path_direach(&refs_path, _dirent_loose_listall, &data); |
| git_buf_free(&refs_path); |
| |
| return result; |
| } |
| |
| static int cb__reflist_add(const char *ref, void *data) |
| { |
| return git_vector_insert((git_vector *)data, git__strdup(ref)); |
| } |
| |
| int git_reference_list( |
| git_strarray *array, |
| git_repository *repo, |
| unsigned int list_flags) |
| { |
| git_vector ref_list; |
| |
| assert(array && repo); |
| |
| array->strings = NULL; |
| array->count = 0; |
| |
| if (git_vector_init(&ref_list, 8, NULL) < 0) |
| return -1; |
| |
| if (git_reference_foreach( |
| repo, list_flags, &cb__reflist_add, (void *)&ref_list) < 0) { |
| git_vector_free(&ref_list); |
| return -1; |
| } |
| |
| array->strings = (char **)ref_list.contents; |
| array->count = ref_list.length; |
| return 0; |
| } |
| |
| int git_reference_reload(git_reference *ref) |
| { |
| return reference_lookup(ref); |
| } |
| |
| void git_repository__refcache_free(git_refcache *refs) |
| { |
| assert(refs); |
| |
| if (refs->packfile) { |
| struct packref *reference; |
| |
| git_strmap_foreach_value(refs->packfile, reference, { |
| git__free(reference); |
| }); |
| |
| git_strmap_free(refs->packfile); |
| } |
| } |
| |
| static int is_valid_ref_char(char ch) |
| { |
| if ((unsigned) ch <= ' ') |
| return 0; |
| |
| switch (ch) { |
| case '~': |
| case '^': |
| case ':': |
| case '\\': |
| case '?': |
| case '[': |
| case '*': |
| return 0; |
| default: |
| return 1; |
| } |
| } |
| |
| static int normalize_name( |
| char *buffer_out, |
| size_t out_size, |
| const char *name, |
| int is_oid_ref) |
| { |
| const char *name_end, *buffer_out_start; |
| const char *current; |
| int contains_a_slash = 0; |
| |
| assert(name && buffer_out); |
| |
| buffer_out_start = buffer_out; |
| current = name; |
| name_end = name + strlen(name); |
| |
| /* Terminating null byte */ |
| out_size--; |
| |
| /* A refname can not be empty */ |
| if (name_end == name) |
| goto invalid_name; |
| |
| /* A refname can not end with a dot or a slash */ |
| if (*(name_end - 1) == '.' || *(name_end - 1) == '/') |
| goto invalid_name; |
| |
| while (current < name_end && out_size) { |
| if (!is_valid_ref_char(*current)) |
| goto invalid_name; |
| |
| if (buffer_out > buffer_out_start) { |
| char prev = *(buffer_out - 1); |
| |
| /* A refname can not start with a dot nor contain a double dot */ |
| if (*current == '.' && ((prev == '.') || (prev == '/'))) |
| goto invalid_name; |
| |
| /* '@{' is forbidden within a refname */ |
| if (*current == '{' && prev == '@') |
| goto invalid_name; |
| |
| /* Prevent multiple slashes from being added to the output */ |
| if (*current == '/' && prev == '/') { |
| current++; |
| continue; |
| } |
| } |
| |
| if (*current == '/') |
| contains_a_slash = 1; |
| |
| *buffer_out++ = *current++; |
| out_size--; |
| } |
| |
| if (!out_size) |
| goto invalid_name; |
| |
| /* Object id refname have to contain at least one slash, except |
| * for HEAD in a detached state or MERGE_HEAD if we're in the |
| * middle of a merge */ |
| if (is_oid_ref && |
| !contains_a_slash && |
| strcmp(name, GIT_HEAD_FILE) != 0 && |
| strcmp(name, GIT_MERGE_HEAD_FILE) != 0 && |
| strcmp(name, GIT_FETCH_HEAD_FILE) != 0) |
| goto invalid_name; |
| |
| /* A refname can not end with ".lock" */ |
| if (!git__suffixcmp(name, GIT_FILELOCK_EXTENSION)) |
| goto invalid_name; |
| |
| *buffer_out = '\0'; |
| |
| /* |
| * For object id references, name has to start with refs/. Again, |
| * we need to allow HEAD to be in a detached state. |
| */ |
| if (is_oid_ref && !(git__prefixcmp(buffer_out_start, GIT_REFS_DIR) || |
| strcmp(buffer_out_start, GIT_HEAD_FILE))) |
| goto invalid_name; |
| |
| return 0; |
| |
| invalid_name: |
| giterr_set(GITERR_REFERENCE, "The given reference name is not valid"); |
| return -1; |
| } |
| |
| int git_reference__normalize_name( |
| char *buffer_out, |
| size_t out_size, |
| const char *name) |
| { |
| return normalize_name(buffer_out, out_size, name, 0); |
| } |
| |
| int git_reference__normalize_name_oid( |
| char *buffer_out, |
| size_t out_size, |
| const char *name) |
| { |
| return normalize_name(buffer_out, out_size, name, 1); |
| } |
| |
| #define GIT_REF_TYPEMASK (GIT_REF_OID | GIT_REF_SYMBOLIC) |
| |
| int git_reference_cmp(git_reference *ref1, git_reference *ref2) |
| { |
| assert(ref1 && ref2); |
| |
| /* let's put symbolic refs before OIDs */ |
| if ((ref1->flags & GIT_REF_TYPEMASK) != (ref2->flags & GIT_REF_TYPEMASK)) |
| return (ref1->flags & GIT_REF_SYMBOLIC) ? -1 : 1; |
| |
| if (ref1->flags & GIT_REF_SYMBOLIC) |
| return strcmp(ref1->target.symbolic, ref2->target.symbolic); |
| |
| return git_oid_cmp(&ref1->target.oid, &ref2->target.oid); |
| } |
| |
| /* Update the reference named `ref_name` so it points to `oid` */ |
| int git_reference__update(git_repository *repo, const git_oid *oid, const char *ref_name) |
| { |
| git_reference *ref; |
| int res; |
| |
| res = git_reference_lookup(&ref, repo, ref_name); |
| |
| /* If we haven't found the reference at all, we assume we need to create |
| * a new reference and that's it */ |
| if (res == GIT_ENOTFOUND) { |
| giterr_clear(); |
| return git_reference_create_oid(NULL, repo, ref_name, oid, 1); |
| } |
| |
| if (res < 0) |
| return -1; |
| |
| /* If we have found a reference, but it's symbolic, we need to update |
| * the direct reference it points to */ |
| if (git_reference_type(ref) == GIT_REF_SYMBOLIC) { |
| git_reference *aux; |
| const char *sym_target; |
| |
| /* The target pointed at by this reference */ |
| sym_target = git_reference_target(ref); |
| |
| /* resolve the reference to the target it points to */ |
| res = git_reference_resolve(&aux, ref); |
| |
| /* |
| * if the symbolic reference pointed to an inexisting ref, |
| * this is means we're creating a new branch, for example. |
| * We need to create a new direct reference with that name |
| */ |
| if (res == GIT_ENOTFOUND) { |
| giterr_clear(); |
| res = git_reference_create_oid(NULL, repo, sym_target, oid, 1); |
| git_reference_free(ref); |
| return res; |
| } |
| |
| /* free the original symbolic reference now; not before because |
| * we're using the `sym_target` pointer */ |
| git_reference_free(ref); |
| |
| if (res < 0) |
| return -1; |
| |
| /* store the newly found direct reference in its place */ |
| ref = aux; |
| } |
| |
| /* ref is made to point to `oid`: ref is either the original reference, |
| * or the target of the symbolic reference we've looked up */ |
| res = git_reference_set_oid(ref, oid); |
| git_reference_free(ref); |
| return res; |
| } |
| |
| struct glob_cb_data { |
| const char *glob; |
| int (*callback)(const char *, void *); |
| void *payload; |
| }; |
| |
| static int fromglob_cb(const char *reference_name, void *payload) |
| { |
| struct glob_cb_data *data = (struct glob_cb_data *)payload; |
| |
| if (!p_fnmatch(data->glob, reference_name, 0)) |
| return data->callback(reference_name, data->payload); |
| |
| return 0; |
| } |
| |
| int git_reference_foreach_glob( |
| git_repository *repo, |
| const char *glob, |
| unsigned int list_flags, |
| int (*callback)( |
| const char *reference_name, |
| void *payload), |
| void *payload) |
| { |
| struct glob_cb_data data; |
| |
| assert(repo && glob && callback); |
| |
| data.glob = glob; |
| data.callback = callback; |
| data.payload = payload; |
| |
| return git_reference_foreach( |
| repo, list_flags, fromglob_cb, &data); |
| } |