const unsigned char *sha1, int flag,
int check_name)
{
- int len;
struct ref_entry *ref;
if (check_name &&
check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
die("Reference has invalid format: '%s'", refname);
- len = strlen(refname) + 1;
- ref = xmalloc(sizeof(struct ref_entry) + len);
+ FLEX_ALLOC_STR(ref, name, refname);
hashcpy(ref->u.value.oid.hash, sha1);
oidclr(&ref->u.value.peeled);
- memcpy(ref->name, refname, len);
ref->flag = flag;
return ref;
}
int incomplete)
{
struct ref_entry *direntry;
- direntry = xcalloc(1, sizeof(struct ref_entry) + len + 1);
- memcpy(direntry->name, dirname, len);
- direntry->name[len] = '\0';
+ FLEX_ALLOC_MEM(direntry, name, dirname, len);
direntry->u.subdir.ref_cache = ref_cache;
direntry->flag = REF_DIR | (incomplete ? REF_INCOMPLETE : 0);
return direntry;
dir->sorted = dir->nr = i;
}
-/* Include broken references in a do_for_each_ref*() iteration: */
-#define DO_FOR_EACH_INCLUDE_BROKEN 0x01
-
/*
* Return true iff the reference described by entry can be resolved to
* an object in the database. Emit a warning if the referred-to
*/
static struct ref_cache *create_ref_cache(const char *submodule)
{
- int len;
struct ref_cache *refs;
if (!submodule)
submodule = "";
- len = strlen(submodule) + 1;
- refs = xcalloc(1, sizeof(struct ref_cache) + len);
- memcpy(refs->name, submodule, len);
+ FLEX_ALLOC_STR(refs, name, submodule);
refs->next = submodule_ref_caches;
submodule_ref_caches = refs;
return refs;
return get_ref_dir(refs->loose);
}
-/* We allow "recursive" symbolic refs. Only within reason, though */
-#define MAXDEPTH 5
#define MAXREFLEN (1024)
/*
char buffer[128], *p;
char *path;
- if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN)
+ if (recursion > SYMREF_MAXDEPTH || strlen(refname) > MAXREFLEN)
return -1;
path = *refs->name
? git_pathdup_submodule(refs->name, "%s", refname)
}
/*
- * A loose ref file doesn't exist; check for a packed ref. The
- * options are forwarded from resolve_safe_unsafe().
+ * A loose ref file doesn't exist; check for a packed ref.
*/
static int resolve_missing_loose_ref(const char *refname,
- int resolve_flags,
unsigned char *sha1,
- int *flags)
+ unsigned int *flags)
{
struct ref_entry *entry;
entry = get_packed_ref(refname);
if (entry) {
hashcpy(sha1, entry->u.value.oid.hash);
- if (flags)
- *flags |= REF_ISPACKED;
- return 0;
- }
- /* The reference is not a packed reference, either. */
- if (resolve_flags & RESOLVE_REF_READING) {
- errno = ENOENT;
- return -1;
- } else {
- hashclr(sha1);
+ *flags |= REF_ISPACKED;
return 0;
}
+ /* refname is not a packed reference. */
+ return -1;
}
-/* This function needs to return a meaningful errno on failure */
-static const char *resolve_ref_1(const char *refname,
- int resolve_flags,
- unsigned char *sha1,
- int *flags,
- struct strbuf *sb_refname,
- struct strbuf *sb_path,
- struct strbuf *sb_contents)
+/*
+ * Read a raw ref from the filesystem or packed refs file.
+ *
+ * If the ref is a sha1, fill in sha1 and return 0.
+ *
+ * If the ref is symbolic, fill in *symref with the referrent
+ * (e.g. "refs/heads/master") and return 0. The caller is responsible
+ * for validating the referrent. Set REF_ISSYMREF in flags.
+ *
+ * If the ref doesn't exist, set errno to ENOENT and return -1.
+ *
+ * If the ref exists but is neither a symbolic ref nor a sha1, it is
+ * broken. Set REF_ISBROKEN in flags, set errno to EINVAL, and return
+ * -1.
+ *
+ * If there is another error reading the ref, set errno appropriately and
+ * return -1.
+ *
+ * Backend-specific flags might be set in flags as well, regardless of
+ * outcome.
+ *
+ * sb_path is workspace: the caller should allocate and free it.
+ *
+ * It is OK for refname to point into symref. In this case:
+ * - if the function succeeds with REF_ISSYMREF, symref will be
+ * overwritten and the memory pointed to by refname might be changed
+ * or even freed.
+ * - in all other cases, symref will be untouched, and therefore
+ * refname will still be valid and unchanged.
+ */
+int read_raw_ref(const char *refname, unsigned char *sha1,
+ struct strbuf *symref, unsigned int *flags)
{
- int depth = MAXDEPTH;
- int bad_name = 0;
+ struct strbuf sb_contents = STRBUF_INIT;
+ struct strbuf sb_path = STRBUF_INIT;
+ const char *path;
+ const char *buf;
+ struct stat st;
+ int fd;
+ int ret = -1;
+ int save_errno;
- if (flags)
- *flags = 0;
+ strbuf_reset(&sb_path);
+ strbuf_git_path(&sb_path, "%s", refname);
+ path = sb_path.buf;
- if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
- if (flags)
- *flags |= REF_BAD_NAME;
+stat_ref:
+ /*
+ * We might have to loop back here to avoid a race
+ * condition: first we lstat() the file, then we try
+ * to read it as a link or as a file. But if somebody
+ * changes the type of the file (file <-> directory
+ * <-> symlink) between the lstat() and reading, then
+ * we don't want to report that as an error but rather
+ * try again starting with the lstat().
+ */
- if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
- !refname_is_safe(refname)) {
- errno = EINVAL;
- return NULL;
+ if (lstat(path, &st) < 0) {
+ if (errno != ENOENT)
+ goto out;
+ if (resolve_missing_loose_ref(refname, sha1, flags)) {
+ errno = ENOENT;
+ goto out;
}
- /*
- * dwim_ref() uses REF_ISBROKEN to distinguish between
- * missing refs and refs that were present but invalid,
- * to complain about the latter to stderr.
- *
- * We don't know whether the ref exists, so don't set
- * REF_ISBROKEN yet.
- */
- bad_name = 1;
+ ret = 0;
+ goto out;
}
- for (;;) {
- const char *path;
- struct stat st;
- char *buf;
- int fd;
-
- if (--depth < 0) {
- errno = ELOOP;
- return NULL;
- }
-
- strbuf_reset(sb_path);
- strbuf_git_path(sb_path, "%s", refname);
- path = sb_path->buf;
-
- /*
- * We might have to loop back here to avoid a race
- * condition: first we lstat() the file, then we try
- * to read it as a link or as a file. But if somebody
- * changes the type of the file (file <-> directory
- * <-> symlink) between the lstat() and reading, then
- * we don't want to report that as an error but rather
- * try again starting with the lstat().
- */
- stat_ref:
- if (lstat(path, &st) < 0) {
- if (errno != ENOENT)
- return NULL;
- if (resolve_missing_loose_ref(refname, resolve_flags,
- sha1, flags))
- return NULL;
- if (bad_name) {
- hashclr(sha1);
- if (flags)
- *flags |= REF_ISBROKEN;
- }
- return refname;
- }
- /* Follow "normalized" - ie "refs/.." symlinks by hand */
- if (S_ISLNK(st.st_mode)) {
- strbuf_reset(sb_contents);
- if (strbuf_readlink(sb_contents, path, 0) < 0) {
- if (errno == ENOENT || errno == EINVAL)
- /* inconsistent with lstat; retry */
- goto stat_ref;
- else
- return NULL;
- }
- if (starts_with(sb_contents->buf, "refs/") &&
- !check_refname_format(sb_contents->buf, 0)) {
- strbuf_swap(sb_refname, sb_contents);
- refname = sb_refname->buf;
- if (flags)
- *flags |= REF_ISSYMREF;
- if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
- hashclr(sha1);
- return refname;
- }
- continue;
- }
- }
-
- /* Is it a directory? */
- if (S_ISDIR(st.st_mode)) {
- errno = EISDIR;
- return NULL;
- }
-
- /*
- * Anything else, just open it and try to use it as
- * a ref
- */
- fd = open(path, O_RDONLY);
- if (fd < 0) {
- if (errno == ENOENT)
+ /* Follow "normalized" - ie "refs/.." symlinks by hand */
+ if (S_ISLNK(st.st_mode)) {
+ strbuf_reset(&sb_contents);
+ if (strbuf_readlink(&sb_contents, path, 0) < 0) {
+ if (errno == ENOENT || errno == EINVAL)
/* inconsistent with lstat; retry */
goto stat_ref;
else
- return NULL;
+ goto out;
}
- strbuf_reset(sb_contents);
- if (strbuf_read(sb_contents, fd, 256) < 0) {
- int save_errno = errno;
- close(fd);
- errno = save_errno;
- return NULL;
+ if (starts_with(sb_contents.buf, "refs/") &&
+ !check_refname_format(sb_contents.buf, 0)) {
+ strbuf_swap(&sb_contents, symref);
+ *flags |= REF_ISSYMREF;
+ ret = 0;
+ goto out;
}
- close(fd);
- strbuf_rtrim(sb_contents);
+ }
- /*
- * Is it a symbolic ref?
- */
- if (!starts_with(sb_contents->buf, "ref:")) {
- /*
- * Please note that FETCH_HEAD has a second
- * line containing other data.
- */
- if (get_sha1_hex(sb_contents->buf, sha1) ||
- (sb_contents->buf[40] != '\0' && !isspace(sb_contents->buf[40]))) {
- if (flags)
- *flags |= REF_ISBROKEN;
- errno = EINVAL;
- return NULL;
- }
- if (bad_name) {
- hashclr(sha1);
- if (flags)
- *flags |= REF_ISBROKEN;
- }
- return refname;
- }
- if (flags)
- *flags |= REF_ISSYMREF;
- buf = sb_contents->buf + 4;
+ /* Is it a directory? */
+ if (S_ISDIR(st.st_mode)) {
+ errno = EISDIR;
+ goto out;
+ }
+
+ /*
+ * Anything else, just open it and try to use it as
+ * a ref
+ */
+ fd = open(path, O_RDONLY);
+ if (fd < 0) {
+ if (errno == ENOENT)
+ /* inconsistent with lstat; retry */
+ goto stat_ref;
+ else
+ goto out;
+ }
+ strbuf_reset(&sb_contents);
+ if (strbuf_read(&sb_contents, fd, 256) < 0) {
+ int save_errno = errno;
+ close(fd);
+ errno = save_errno;
+ goto out;
+ }
+ close(fd);
+ strbuf_rtrim(&sb_contents);
+ buf = sb_contents.buf;
+ if (starts_with(buf, "ref:")) {
+ buf += 4;
while (isspace(*buf))
buf++;
- strbuf_reset(sb_refname);
- strbuf_addstr(sb_refname, buf);
- refname = sb_refname->buf;
- if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
- hashclr(sha1);
- return refname;
- }
- if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
- if (flags)
- *flags |= REF_ISBROKEN;
-
- if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
- !refname_is_safe(buf)) {
- errno = EINVAL;
- return NULL;
- }
- bad_name = 1;
- }
+
+ strbuf_reset(symref);
+ strbuf_addstr(symref, buf);
+ *flags |= REF_ISSYMREF;
+ ret = 0;
+ goto out;
}
-}
-const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
- unsigned char *sha1, int *flags)
-{
- static struct strbuf sb_refname = STRBUF_INIT;
- struct strbuf sb_contents = STRBUF_INIT;
- struct strbuf sb_path = STRBUF_INIT;
- const char *ret;
+ /*
+ * Please note that FETCH_HEAD has additional
+ * data after the sha.
+ */
+ if (get_sha1_hex(buf, sha1) ||
+ (buf[40] != '\0' && !isspace(buf[40]))) {
+ *flags |= REF_ISBROKEN;
+ errno = EINVAL;
+ goto out;
+ }
+
+ ret = 0;
- ret = resolve_ref_1(refname, resolve_flags, sha1, flags,
- &sb_refname, &sb_path, &sb_contents);
+out:
+ save_errno = errno;
strbuf_release(&sb_path);
strbuf_release(&sb_contents);
+ errno = save_errno;
return ret;
}
* value, stop the iteration and return that value; otherwise, return
* 0.
*/
-static int do_for_each_ref(struct ref_cache *refs, const char *base,
- each_ref_fn fn, int trim, int flags, void *cb_data)
+int do_for_each_ref(const char *submodule, const char *base,
+ each_ref_fn fn, int trim, int flags, void *cb_data)
{
struct ref_entry_cb data;
+ struct ref_cache *refs;
+
+ refs = get_ref_cache(submodule);
data.base = base;
data.trim = trim;
data.flags = flags;
return do_for_each_entry(refs, base, do_one_ref, &data);
}
-static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- struct object_id oid;
- int flag;
-
- if (submodule) {
- if (resolve_gitlink_ref(submodule, "HEAD", oid.hash) == 0)
- return fn("HEAD", &oid, 0, cb_data);
-
- return 0;
- }
-
- if (!read_ref_full("HEAD", RESOLVE_REF_READING, oid.hash, &flag))
- return fn("HEAD", &oid, flag, cb_data);
-
- return 0;
-}
-
-int head_ref(each_ref_fn fn, void *cb_data)
-{
- return do_head_ref(NULL, fn, cb_data);
-}
-
-int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return do_head_ref(submodule, fn, cb_data);
-}
-
-int for_each_ref(each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, "", fn, 0, 0, cb_data);
-}
-
-int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(get_ref_cache(submodule), "", fn, 0, 0, cb_data);
-}
-
-int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, prefix, fn, strlen(prefix), 0, cb_data);
-}
-
-int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data, unsigned int broken)
-{
- unsigned int flag = 0;
-
- if (broken)
- flag = DO_FOR_EACH_INCLUDE_BROKEN;
- return do_for_each_ref(&ref_cache, prefix, fn, 0, flag, cb_data);
-}
-
-int for_each_ref_in_submodule(const char *submodule, const char *prefix,
- each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(get_ref_cache(submodule), prefix, fn, strlen(prefix), 0, cb_data);
-}
-
-int for_each_replace_ref(each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, git_replace_ref_base, fn,
- strlen(git_replace_ref_base), 0, cb_data);
-}
-
-int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
-{
- struct strbuf buf = STRBUF_INIT;
- int ret;
- strbuf_addf(&buf, "%srefs/", get_git_namespace());
- ret = do_for_each_ref(&ref_cache, buf.buf, fn, 0, 0, cb_data);
- strbuf_release(&buf);
- return ret;
-}
-
-int for_each_rawref(each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, "", fn, 0,
- DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
-}
-
static void unlock_ref(struct ref_lock *lock)
{
/* Do not free lock->lk -- atexit() still looks at them */
if (read_ref_full(lock->ref_name,
mustexist ? RESOLVE_REF_READING : 0,
lock->old_oid.hash, NULL)) {
- int save_errno = errno;
- strbuf_addf(err, "can't verify ref %s", lock->ref_name);
- errno = save_errno;
- return -1;
+ if (old_sha1) {
+ int save_errno = errno;
+ strbuf_addf(err, "can't verify ref %s", lock->ref_name);
+ errno = save_errno;
+ return -1;
+ } else {
+ hashclr(lock->old_oid.hash);
+ return 0;
+ }
}
- if (hashcmp(lock->old_oid.hash, old_sha1)) {
+ if (old_sha1 && hashcmp(lock->old_oid.hash, old_sha1)) {
strbuf_addf(err, "ref %s is at %s but expected %s",
lock->ref_name,
sha1_to_hex(lock->old_oid.hash),
const char *orig_refname = refname;
struct ref_lock *lock;
int last_errno = 0;
- int type, lflags;
+ int type;
+ int lflags = 0;
int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
int resolve_flags = 0;
int attempts_remaining = 3;
if (mustexist)
resolve_flags |= RESOLVE_REF_READING;
- if (flags & REF_DELETING) {
+ if (flags & REF_DELETING)
resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME;
- if (flags & REF_NODEREF)
- resolve_flags |= RESOLVE_REF_NO_RECURSE;
+ if (flags & REF_NODEREF) {
+ resolve_flags |= RESOLVE_REF_NO_RECURSE;
+ lflags |= LOCK_NO_DEREF;
}
refname = resolve_ref_unsafe(refname, resolve_flags,
goto error_return;
}
+
+ if (flags & REF_NODEREF)
+ refname = orig_refname;
+
/*
* If the ref did not exist and we are creating it, make sure
* there is no existing packed ref whose name begins with our
lock->lk = xcalloc(1, sizeof(struct lock_file));
- lflags = 0;
- if (flags & REF_NODEREF) {
- refname = orig_refname;
- lflags |= LOCK_NO_DEREF;
- }
lock->ref_name = xstrdup(refname);
lock->orig_ref_name = xstrdup(orig_refname);
strbuf_git_path(&ref_file, "%s", refname);
goto error_return;
}
}
- if (old_sha1 && verify_lock(lock, old_sha1, mustexist, err)) {
+ if (verify_lock(lock, old_sha1, mustexist, err)) {
last_errno = errno;
goto error_return;
}
/* Schedule the loose reference for pruning if requested. */
if ((cb->flags & PACK_REFS_PRUNE)) {
- int namelen = strlen(entry->name) + 1;
- struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
+ struct ref_to_prune *n;
+ FLEX_ALLOC_STR(n, name, entry->name);
hashcpy(n->sha1, entry->u.value.oid.hash);
- memcpy(n->name, entry->name, namelen); /* includes NUL */
n->next = cb->ref_to_prune;
cb->ref_to_prune = n;
}
return 0;
}
-int create_symref(const char *ref_target, const char *refs_heads_master,
- const char *logmsg)
+static int create_ref_symlink(struct ref_lock *lock, const char *target)
{
- char *lockpath = NULL;
- char ref[1000];
- int fd, len, written;
- char *git_HEAD = git_pathdup("%s", ref_target);
- unsigned char old_sha1[20], new_sha1[20];
- struct strbuf err = STRBUF_INIT;
-
- if (logmsg && read_ref(ref_target, old_sha1))
- hashclr(old_sha1);
-
- if (safe_create_leading_directories(git_HEAD) < 0)
- return error("unable to create directory for %s", git_HEAD);
-
+ int ret = -1;
#ifndef NO_SYMLINK_HEAD
- if (prefer_symlink_refs) {
- unlink(git_HEAD);
- if (!symlink(refs_heads_master, git_HEAD))
- goto done;
+ char *ref_path = get_locked_file_path(lock->lk);
+ unlink(ref_path);
+ ret = symlink(target, ref_path);
+ free(ref_path);
+
+ if (ret)
fprintf(stderr, "no symlink - falling back to symbolic ref\n");
- }
#endif
+ return ret;
+}
- len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
- if (sizeof(ref) <= len) {
- error("refname too long: %s", refs_heads_master);
- goto error_free_return;
+static void update_symref_reflog(struct ref_lock *lock, const char *refname,
+ const char *target, const char *logmsg)
+{
+ struct strbuf err = STRBUF_INIT;
+ unsigned char new_sha1[20];
+ if (logmsg && !read_ref(target, new_sha1) &&
+ log_ref_write(refname, lock->old_oid.hash, new_sha1, logmsg, 0, &err)) {
+ error("%s", err.buf);
+ strbuf_release(&err);
}
- lockpath = mkpathdup("%s.lock", git_HEAD);
- fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
- if (fd < 0) {
- error("Unable to open %s for writing", lockpath);
- goto error_free_return;
- }
- written = write_in_full(fd, ref, len);
- if (close(fd) != 0 || written != len) {
- error("Unable to write to %s", lockpath);
- goto error_unlink_return;
- }
- if (rename(lockpath, git_HEAD) < 0) {
- error("Unable to create %s", git_HEAD);
- goto error_unlink_return;
- }
- if (adjust_shared_perm(git_HEAD)) {
- error("Unable to fix permissions on %s", lockpath);
- error_unlink_return:
- unlink_or_warn(lockpath);
- error_free_return:
- free(lockpath);
- free(git_HEAD);
- return -1;
+}
+
+static int create_symref_locked(struct ref_lock *lock, const char *refname,
+ const char *target, const char *logmsg)
+{
+ if (prefer_symlink_refs && !create_ref_symlink(lock, target)) {
+ update_symref_reflog(lock, refname, target, logmsg);
+ return 0;
}
- free(lockpath);
-#ifndef NO_SYMLINK_HEAD
- done:
-#endif
- if (logmsg && !read_ref(refs_heads_master, new_sha1) &&
- log_ref_write(ref_target, old_sha1, new_sha1, logmsg, 0, &err)) {
+ if (!fdopen_lock_file(lock->lk, "w"))
+ return error("unable to fdopen %s: %s",
+ lock->lk->tempfile.filename.buf, strerror(errno));
+
+ update_symref_reflog(lock, refname, target, logmsg);
+
+ /* no error check; commit_ref will check ferror */
+ fprintf(lock->lk->tempfile.fp, "ref: %s\n", target);
+ if (commit_ref(lock) < 0)
+ return error("unable to write symref for %s: %s", refname,
+ strerror(errno));
+ return 0;
+}
+
+int create_symref(const char *refname, const char *target, const char *logmsg)
+{
+ struct strbuf err = STRBUF_INIT;
+ struct ref_lock *lock;
+ int ret;
+
+ lock = lock_ref_sha1_basic(refname, NULL, NULL, NULL, REF_NODEREF, NULL,
+ &err);
+ if (!lock) {
error("%s", err.buf);
strbuf_release(&err);
+ return -1;
}
- free(git_HEAD);
- return 0;
+ ret = create_symref_locked(lock, refname, target, logmsg);
+ unlock_ref(lock);
+ return ret;
}
int reflog_exists(const char *refname)