Reduce the number of connects when fetching

diff --git a/refs.c b/refs.c
index 759924d0c93621d72918f29145ae0377f34e8e0c..67d2a502afb60050f0ce750c21ae1a42fa5cb803 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -613,32 +613,37 @@ int check_ref_format(const char *ref)
                while ((ch = *cp++) == '/')
                        ; /* tolerate duplicated slashes */
                if (!ch)
-                       return -1; /* should not end with slashes */
+                       /* should not end with slashes */
+                       return CHECK_REF_FORMAT_ERROR;
 
                /* we are at the beginning of the path component */
                if (ch == '.')
-                       return -1;
+                       return CHECK_REF_FORMAT_ERROR;
                bad_type = bad_ref_char(ch);
                if (bad_type) {
-                       return (bad_type == 2 && !*cp) ? -3 : -1;
+                       return (bad_type == 2 && !*cp)
+                               ? CHECK_REF_FORMAT_WILDCARD
+                               : CHECK_REF_FORMAT_ERROR;
                }
 
                /* scan the rest of the path component */
                while ((ch = *cp++) != 0) {
                        bad_type = bad_ref_char(ch);
                        if (bad_type) {
-                               return (bad_type == 2 && !*cp) ? -3 : -1;
+                               return (bad_type == 2 && !*cp)
+                                       ? CHECK_REF_FORMAT_WILDCARD
+                                       : CHECK_REF_FORMAT_ERROR;
                        }
                        if (ch == '/')
                                break;
                        if (ch == '.' && *cp == '.')
-                               return -1;
+                               return CHECK_REF_FORMAT_ERROR;
                }
                level++;
                if (!ch) {
                        if (level < 2)
-                               return -2; /* at least of form "heads/blah" */
-                       return 0;
+                               return CHECK_REF_FORMAT_ONELEVEL;
+                       return CHECK_REF_FORMAT_OK;
                }
        }
 }
@@ -816,9 +821,13 @@ struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
 
 struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags)
 {
-       if (check_ref_format(ref) == -1)
+       switch (check_ref_format(ref)) {
+       default:
                return NULL;
-       return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
+       case 0:
+       case CHECK_REF_FORMAT_ONELEVEL:
+               return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
+       }
 }
 
 static struct lock_file packlock;
@@ -855,7 +864,6 @@ static int repack_without_ref(const char *refname)
                        die("too long a refname '%s'", list->name);
                write_or_die(fd, line, len);
        }
-       close(fd);
        return commit_lock_file(&packlock);
 }
 
@@ -1010,14 +1018,27 @@ int rename_ref(const char *oldref, const char *newref, const char *logmsg)
        return 1;
 }
 
+static int close_ref(struct ref_lock *lock)
+{
+       if (close_lock_file(lock->lk))
+               return -1;
+       lock->lock_fd = -1;
+       return 0;
+}
+
+static int commit_ref(struct ref_lock *lock)
+{
+       if (commit_lock_file(lock->lk))
+               return -1;
+       lock->lock_fd = -1;
+       return 0;
+}
+
 void unlock_ref(struct ref_lock *lock)
 {
-       if (lock->lock_fd >= 0) {
-               close(lock->lock_fd);
-               /* Do not free lock->lk -- atexit() still looks at them */
-               if (lock->lk)
-                       rollback_lock_file(lock->lk);
-       }
+       /* Do not free lock->lk -- atexit() still looks at them */
+       if (lock->lk)
+               rollback_lock_file(lock->lk);
        free(lock->ref_name);
        free(lock->orig_ref_name);
        free(lock);
@@ -1110,10 +1131,16 @@ static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
        return 0;
 }
 
+static int is_branch(const char *refname)
+{
+       return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
+}
+
 int write_ref_sha1(struct ref_lock *lock,
        const unsigned char *sha1, const char *logmsg)
 {
        static char term = '\n';
+       struct object *o;
 
        if (!lock)
                return -1;
@@ -1121,9 +1148,22 @@ int write_ref_sha1(struct ref_lock *lock,
                unlock_ref(lock);
                return 0;
        }
+       o = parse_object(sha1);
+       if (!o) {
+               error("Trying to write ref %s with nonexistant object %s",
+                       lock->ref_name, sha1_to_hex(sha1));
+               unlock_ref(lock);
+               return -1;
+       }
+       if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
+               error("Trying to write non-commit object %s to branch %s",
+                       sha1_to_hex(sha1), lock->ref_name);
+               unlock_ref(lock);
+               return -1;
+       }
        if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
            write_in_full(lock->lock_fd, &term, 1) != 1
-               || close(lock->lock_fd) < 0) {
+               || close_ref(lock) < 0) {
                error("Couldn't write %s", lock->lk->filename);
                unlock_ref(lock);
                return -1;
@@ -1156,12 +1196,11 @@ int write_ref_sha1(struct ref_lock *lock,
                    !strcmp(head_ref, lock->ref_name))
                        log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
        }
-       if (commit_lock_file(lock->lk)) {
+       if (commit_ref(lock)) {
                error("Couldn't set %s", lock->ref_name);
                unlock_ref(lock);
                return -1;
        }
-       lock->lock_fd = -1;
        unlock_ref(lock);
        return 0;
 }