diff options
Diffstat (limited to 'refs')
| -rw-r--r-- | refs/files-backend.c | 147 |
1 files changed, 76 insertions, 71 deletions
diff --git a/refs/files-backend.c b/refs/files-backend.c index c648b5e853..81c92b410e 100644 --- a/refs/files-backend.c +++ b/refs/files-backend.c @@ -1840,12 +1840,17 @@ static int verify_lock(struct ref_lock *lock, 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), @@ -1882,7 +1887,8 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname, 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; @@ -1893,10 +1899,11 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname, 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, @@ -1932,6 +1939,10 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname, 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 @@ -1947,11 +1958,6 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname, 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); @@ -1985,7 +1991,7 @@ static struct ref_lock *lock_ref_sha1_basic(const char *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; } @@ -2811,73 +2817,72 @@ static int commit_ref_update(struct ref_lock *lock, 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; - } - 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 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); } - 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)) { +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; + } + + 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) |