diff options
Diffstat (limited to 'src/refdb_fs.c')
| -rw-r--r-- | src/refdb_fs.c | 1023 |
1 files changed, 1023 insertions, 0 deletions
diff --git a/src/refdb_fs.c b/src/refdb_fs.c new file mode 100644 index 000000000..f00bd72a0 --- /dev/null +++ b/src/refdb_fs.c @@ -0,0 +1,1023 @@ +/* + * Copyright (C) the libgit2 contributors. All rights reserved. + * + * This file is part of libgit2, distributed under the GNU GPL v2 with + * a Linking Exception. For full terms see the included COPYING file. + */ + +#include "refs.h" +#include "hash.h" +#include "repository.h" +#include "fileops.h" +#include "pack.h" +#include "reflog.h" +#include "config.h" +#include "refdb.h" +#include "refdb_fs.h" + +#include <git2/tag.h> +#include <git2/object.h> +#include <git2/refdb.h> +#include <git2/refdb_backend.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]; +}; + +typedef struct refdb_fs_backend { + git_refdb_backend parent; + + git_repository *repo; + const char *path; + git_refdb *refdb; + + git_refcache refcache; +} refdb_fs_backend; + +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, NULL, updated); + git_buf_free(&path); + + return result; +} + +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) + refname_end = buffer_end; + + 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_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 != buffer_end) { + if (*buffer == '\n') + buffer++; + else + goto corrupt; + } + + *buffer_out = buffer; + return 0; + +corrupt: + giterr_set(GITERR_REFERENCE, "The packed references file is corrupted"); + return -1; +} + +static int packed_load(refdb_fs_backend *backend) +{ + int result, updated; + git_buf packfile = GIT_BUF_INIT; + const char *buffer_start, *buffer_end; + git_refcache *ref_cache = &backend->refcache; + + /* 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, + backend->path, 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; +} + +static int loose_parse_oid(git_oid *oid, git_buf *file_content) +{ + size_t len; + const char *str; + + len = git_buf_len(file_content); + if (len < GIT_OID_HEXSZ) + goto corrupted; + + /* str is guranteed to be zero-terminated */ + str = git_buf_cstr(file_content); + + /* we need to get 40 OID characters from the file */ + if (git_oid_fromstr(oid, git_buf_cstr(file_content)) < 0) + goto corrupted; + + /* If the file is longer than 40 chars, the 41st must be a space */ + str += GIT_OID_HEXSZ; + if (*str == '\0' || git__isspace(*str)) + return 0; + +corrupted: + giterr_set(GITERR_REFERENCE, "Corrupted loose reference file"); + return -1; +} + +static int loose_lookup_to_packfile( + struct packref **ref_out, + refdb_fs_backend *backend, + 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, backend->path, name, NULL) < 0) + return -1; + + git_buf_rtrim(&ref_file); + + 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 _dirent_loose_load(void *data, git_buf *full_path) +{ + refdb_fs_backend *backend = (refdb_fs_backend *)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, backend); + + file_path = full_path->ptr + strlen(backend->path); + + if (loose_lookup_to_packfile(&ref, backend, file_path) < 0) + return -1; + + git_strmap_insert2( + backend->refcache.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(refdb_fs_backend *backend) +{ + git_buf refs_path = GIT_BUF_INIT; + int result; + + /* the packfile must have been previously loaded! */ + assert(backend->refcache.packfile); + + if (git_buf_joinpath(&refs_path, backend->path, 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, backend); + git_buf_free(&refs_path); + + return result; +} + +static int refdb_fs_backend__exists( + int *exists, + git_refdb_backend *_backend, + const char *ref_name) +{ + refdb_fs_backend *backend; + git_buf ref_path = GIT_BUF_INIT; + + assert(_backend); + backend = (refdb_fs_backend *)_backend; + + if (packed_load(backend) < 0) + return -1; + + if (git_buf_joinpath(&ref_path, backend->path, ref_name) < 0) + return -1; + + if (git_path_isfile(ref_path.ptr) == true || + git_strmap_exists(backend->refcache.packfile, ref_path.ptr)) + *exists = 1; + else + *exists = 0; + + git_buf_free(&ref_path); + return 0; +} + +static const char *loose_parse_symbolic(git_buf *file_content) +{ + const unsigned int header_len = (unsigned int)strlen(GIT_SYMREF); + const char *refname_start; + + refname_start = (const char *)file_content->ptr; + + if (git_buf_len(file_content) < header_len + 1) { + giterr_set(GITERR_REFERENCE, "Corrupted loose reference file"); + return NULL; + } + + /* + * Assume we have already checked for the header + * before calling this function + */ + refname_start += header_len; + + return refname_start; +} + +static int loose_lookup( + git_reference **out, + refdb_fs_backend *backend, + const char *ref_name) +{ + const char *target; + git_oid oid; + git_buf ref_file = GIT_BUF_INIT; + int error = 0; + + error = reference_read(&ref_file, NULL, backend->path, ref_name, NULL); + + if (error < 0) + goto done; + + if (git__prefixcmp((const char *)(ref_file.ptr), GIT_SYMREF) == 0) { + git_buf_rtrim(&ref_file); + + if ((target = loose_parse_symbolic(&ref_file)) == NULL) { + error = -1; + goto done; + } + + *out = git_reference__alloc(backend->refdb, ref_name, NULL, target); + } else { + if ((error = loose_parse_oid(&oid, &ref_file)) < 0) + goto done; + + *out = git_reference__alloc(backend->refdb, ref_name, &oid, NULL); + } + + if (*out == NULL) + error = -1; + +done: + git_buf_free(&ref_file); + return error; +} + +static int packed_map_entry( + struct packref **entry, + khiter_t *pos, + refdb_fs_backend *backend, + const char *ref_name) +{ + git_strmap *packfile_refs; + + if (packed_load(backend) < 0) + return -1; + + /* Look up on the packfile */ + packfile_refs = backend->refcache.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; + } + + *entry = git_strmap_value_at(packfile_refs, *pos); + + return 0; +} + +static int packed_lookup( + git_reference **out, + refdb_fs_backend *backend, + const char *ref_name) +{ + struct packref *entry; + khiter_t pos; + int error = 0; + + if ((error = packed_map_entry(&entry, &pos, backend, ref_name)) < 0) + return error; + + if ((*out = git_reference__alloc(backend->refdb, ref_name, &entry->oid, NULL)) == NULL) + return -1; + + return 0; +} + +static int refdb_fs_backend__lookup( + git_reference **out, + git_refdb_backend *_backend, + const char *ref_name) +{ + refdb_fs_backend *backend; + int result; + + assert(_backend); + + backend = (refdb_fs_backend *)_backend; + + if ((result = loose_lookup(out, backend, ref_name)) == 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(out, backend, ref_name); + } + + return result; +} + +struct dirent_list_data { + refdb_fs_backend *backend; + size_t repo_path_len; + unsigned int list_type:2; + + git_reference_foreach_cb callback; + void *callback_payload; + int callback_error; +}; + +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 _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 (git_strmap_exists(data->backend->refcache.packfile, file_path)) + return 0; + + if (data->list_type != GIT_REF_LISTALL) { + if ((data->list_type & loose_guess_rtype(full_path)) == 0) + return 0; /* we are filtering out this reference */ + } + + /* Locked references aren't returned */ + if (!git__suffixcmp(file_path, GIT_FILELOCK_EXTENSION)) + return 0; + + if (data->callback(file_path, data->callback_payload)) + data->callback_error = GIT_EUSER; + + return data->callback_error; +} + +static int refdb_fs_backend__foreach( + git_refdb_backend *_backend, + unsigned int list_type, + git_reference_foreach_cb callback, + void *payload) +{ + refdb_fs_backend *backend; + int result; + struct dirent_list_data data; + git_buf refs_path = GIT_BUF_INIT; + const char *ref_name; + void *ref = NULL; + + GIT_UNUSED(ref); + + assert(_backend); + backend = (refdb_fs_backend *)_backend; + + if (packed_load(backend) < 0) + return -1; + + /* list all the packed references first */ + if (list_type & GIT_REF_OID) { + git_strmap_foreach(backend->refcache.packfile, ref_name, ref, { + if (callback(ref_name, payload)) + return GIT_EUSER; + }); + } + + /* now list the loose references, trying not to + * duplicate the ref names already in the packed-refs file */ + + data.repo_path_len = strlen(backend->path); + data.list_type = list_type; + data.backend = backend; + data.callback = callback; + data.callback_payload = payload; + data.callback_error = 0; + + if (git_buf_joinpath(&refs_path, backend->path, GIT_REFS_DIR) < 0) + return -1; + + result = git_path_direach(&refs_path, _dirent_loose_listall, &data); + + git_buf_free(&refs_path); + + return data.callback_error ? GIT_EUSER : result; +} + +static int loose_write(refdb_fs_backend *backend, const git_reference *ref) +{ + git_filebuf file = GIT_FILEBUF_INIT; + git_buf ref_path = GIT_BUF_INIT; + + /* 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) + return -1; + + if (git_buf_joinpath(&ref_path, backend->path, ref->name) < 0) + 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->type == 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->type == GIT_REF_SYMBOLIC) { + git_filebuf_printf(&file, GIT_SYMREF "%s\n", ref->target.symbolic); + } else { + assert(0); /* don't let this happen */ + } + + return git_filebuf_commit(&file, GIT_REFS_FILE_MODE); +} + +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); +} + +/* + * 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(refdb_fs_backend *backend, 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, backend->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_id(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; +} + +/* + * 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; +} + +/* + * 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( + refdb_fs_backend *backend, + git_vector *packing_list) +{ + size_t 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, backend->path, 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; +} + +/* + * Write all the contents in the in-memory packfile to disk. + */ +static int packed_write(refdb_fs_backend *backend) +{ + git_filebuf pack_file = GIT_FILEBUF_INIT; + size_t i; + git_buf pack_file_path = GIT_BUF_INIT; + git_vector packing_list; + unsigned int total_refs; + + assert(backend && backend->refcache.packfile); + + total_refs = + (unsigned int)git_strmap_num_entries(backend->refcache.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(backend->refcache.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, + backend->path, 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(backend, 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(backend, &packing_list) < 0) + goto cleanup_memory; + + { + struct stat st; + if (p_stat(pack_file_path.ptr, &st) == 0) + backend->refcache.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; +} + +static int refdb_fs_backend__write( + git_refdb_backend *_backend, + const git_reference *ref) +{ + refdb_fs_backend *backend; + + assert(_backend); + backend = (refdb_fs_backend *)_backend; + + return loose_write(backend, ref); +} + +static int refdb_fs_backend__delete( + git_refdb_backend *_backend, + const git_reference *ref) +{ + refdb_fs_backend *backend; + git_repository *repo; + git_buf loose_path = GIT_BUF_INIT; + struct packref *pack_ref; + khiter_t pack_ref_pos; + int error = 0, pack_error; + bool loose_deleted; + + assert(_backend); + assert(ref); + + backend = (refdb_fs_backend *)_backend; + repo = backend->repo; + + /* If a loose reference exists, remove it from the filesystem */ + + if (git_buf_joinpath(&loose_path, repo->path_repository, ref->name) < 0) + return -1; + + if (git_path_isfile(loose_path.ptr)) { + error = p_unlink(loose_path.ptr); + loose_deleted = 1; + } + + git_buf_free(&loose_path); + + if (error != 0) + return error; + + /* If a packed reference exists, remove it from the packfile and repack */ + + if ((pack_error = packed_map_entry(&pack_ref, &pack_ref_pos, backend, ref->name)) == 0) { + git_strmap_delete_at(backend->refcache.packfile, pack_ref_pos); + git__free(pack_ref); + + error = packed_write(backend); + } + + if (pack_error == GIT_ENOTFOUND) + error = loose_deleted ? 0 : GIT_ENOTFOUND; + else + error = pack_error; + + return error; +} + +static int refdb_fs_backend__compress(git_refdb_backend *_backend) +{ + refdb_fs_backend *backend; + + assert(_backend); + backend = (refdb_fs_backend *)_backend; + + if (packed_load(backend) < 0 || /* load the existing packfile */ + packed_loadloose(backend) < 0 || /* add all the loose refs */ + packed_write(backend) < 0) /* write back to disk */ + return -1; + + return 0; +} + +static void 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 void refdb_fs_backend__free(git_refdb_backend *_backend) +{ + refdb_fs_backend *backend; + + assert(_backend); + backend = (refdb_fs_backend *)_backend; + + refcache_free(&backend->refcache); + git__free(backend); +} + +int git_refdb_backend_fs( + git_refdb_backend **backend_out, + git_repository *repository, + git_refdb *refdb) +{ + refdb_fs_backend *backend; + + backend = git__calloc(1, sizeof(refdb_fs_backend)); + GITERR_CHECK_ALLOC(backend); + + backend->repo = repository; + backend->path = repository->path_repository; + backend->refdb = refdb; + + backend->parent.exists = &refdb_fs_backend__exists; + backend->parent.lookup = &refdb_fs_backend__lookup; + backend->parent.foreach = &refdb_fs_backend__foreach; + backend->parent.write = &refdb_fs_backend__write; + backend->parent.delete = &refdb_fs_backend__delete; + backend->parent.compress = &refdb_fs_backend__compress; + backend->parent.free = &refdb_fs_backend__free; + + *backend_out = (git_refdb_backend *)backend; + return 0; +} |