prio-queue: add 'peek' operation

diff --git a/refs/files-backend.c b/refs/files-backend.c
index a9a066dcfb60d83a10e27d1c0d1131faf2ae97a4..16ef9325e0d9985c36fd525016340246caaa1af8 100644 (file)
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -363,7 +363,7 @@ static int files_read_raw_ref(struct ref_store *ref_store,
        /* 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 (strbuf_readlink(&sb_contents, path, st.st_size) < 0) {
                        if (errno == ENOENT || errno == EINVAL)
                                /* inconsistent with lstat; retry */
                                goto stat_ref;
@@ -841,7 +841,7 @@ static int verify_lock(struct ref_store *ref_store, struct ref_lock *lock,
                        return 0;
                }
        }
-       if (old_oid && oidcmp(&lock->old_oid, old_oid)) {
+       if (old_oid && !oideq(&lock->old_oid, old_oid)) {
                strbuf_addf(err, "ref '%s' is at %s but expected %s",
                            lock->ref_name,
                            oid_to_hex(&lock->old_oid),
@@ -1582,26 +1582,17 @@ static int log_ref_write_fd(int fd, const struct object_id *old_oid,
                            const struct object_id *new_oid,
                            const char *committer, const char *msg)
 {
-       int msglen, written;
-       unsigned maxlen, len;
-       char *logrec;
-
-       msglen = msg ? strlen(msg) : 0;
-       maxlen = strlen(committer) + msglen + 100;
-       logrec = xmalloc(maxlen);
-       len = xsnprintf(logrec, maxlen, "%s %s %s\n",
-                       oid_to_hex(old_oid),
-                       oid_to_hex(new_oid),
-                       committer);
-       if (msglen)
-               len += copy_reflog_msg(logrec + len - 1, msg) - 1;
-
-       written = len <= maxlen ? write_in_full(fd, logrec, len) : -1;
-       free(logrec);
-       if (written < 0)
-               return -1;
+       struct strbuf sb = STRBUF_INIT;
+       int ret = 0;
 
-       return 0;
+       strbuf_addf(&sb, "%s %s %s", oid_to_hex(old_oid), oid_to_hex(new_oid), committer);
+       if (msg && *msg)
+               copy_reflog_msg(&sb, msg);
+       strbuf_addch(&sb, '\n');
+       if (write_in_full(fd, sb.buf, sb.len) < 0)
+               ret = -1;
+       strbuf_release(&sb);
+       return ret;
 }
 
 static int files_log_ref_write(struct files_ref_store *refs,
@@ -1660,7 +1651,7 @@ static int write_ref_to_lockfile(struct ref_lock *lock,
        struct object *o;
        int fd;
 
-       o = parse_object(oid);
+       o = parse_object(the_repository, oid);
        if (!o) {
                strbuf_addf(err,
                            "trying to write ref '%s' with nonexistent object %s",
@@ -1676,7 +1667,7 @@ static int write_ref_to_lockfile(struct ref_lock *lock,
                return -1;
        }
        fd = get_lock_file_fd(&lock->lk);
-       if (write_in_full(fd, oid_to_hex(oid), GIT_SHA1_HEXSZ) < 0 ||
+       if (write_in_full(fd, oid_to_hex(oid), the_hash_algo->hexsz) < 0 ||
            write_in_full(fd, &term, 1) < 0 ||
            close_ref_gently(lock) < 0) {
                strbuf_addf(err,
@@ -2316,7 +2307,7 @@ static int check_old_oid(struct ref_update *update, struct object_id *oid,
                         struct strbuf *err)
 {
        if (!(update->flags & REF_HAVE_OLD) ||
-                  !oidcmp(oid, &update->old_oid))
+                  oideq(oid, &update->old_oid))
                return 0;
 
        if (is_null_oid(&update->old_oid))
@@ -2452,7 +2443,7 @@ static int lock_ref_for_update(struct files_ref_store *refs,
            !(update->flags & REF_DELETING) &&
            !(update->flags & REF_LOG_ONLY)) {
                if (!(update->type & REF_ISSYMREF) &&
-                   !oidcmp(&lock->old_oid, &update->new_oid)) {
+                   oideq(&lock->old_oid, &update->new_oid)) {
                        /*
                         * The reference already has the desired
                         * value, so we don't need to write it.
@@ -3070,7 +3061,7 @@ static int files_reflog_expire(struct ref_store *ref_store,
                        rollback_lock_file(&reflog_lock);
                } else if (update &&
                           (write_in_full(get_lock_file_fd(&lock->lk),
-                               oid_to_hex(&cb.last_kept_oid), GIT_SHA1_HEXSZ) < 0 ||
+                               oid_to_hex(&cb.last_kept_oid), the_hash_algo->hexsz) < 0 ||
                            write_str_in_full(get_lock_file_fd(&lock->lk), "\n") < 0 ||
                            close_ref_gently(lock) < 0)) {
                        status |= error("couldn't write %s",