entry_matches(): inline function
[gitweb.git] / refs.c
diff --git a/refs.c b/refs.c
index 3a26ad4e65b92bc9398766169f9a236e4be0d08d..6bdd34fc728ece31a9b0f64b29269222dcf98d60 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -6,6 +6,14 @@
 #include "dir.h"
 #include "string-list.h"
 
+struct ref_lock {
+       char *ref_name;
+       char *orig_ref_name;
+       struct lock_file *lk;
+       unsigned char old_sha1[20];
+       int lock_fd;
+};
+
 /*
  * How to handle various characters in refnames:
  * 0: An acceptable character for refs
@@ -26,10 +34,29 @@ static unsigned char refname_disposition[256] = {
 };
 
 /*
- * Used as a flag to ref_transaction_delete when a loose ref is being
+ * Flag passed to lock_ref_sha1_basic() telling it to tolerate broken
+ * refs (i.e., because the reference is about to be deleted anyway).
+ */
+#define REF_DELETING   0x02
+
+/*
+ * Used as a flag in ref_update::flags when a loose ref is being
  * pruned.
  */
-#define REF_ISPRUNING  0x0100
+#define REF_ISPRUNING  0x04
+
+/*
+ * Used as a flag in ref_update::flags when the reference should be
+ * updated to new_sha1.
+ */
+#define REF_HAVE_NEW   0x08
+
+/*
+ * Used as a flag in ref_update::flags when old_sha1 should be
+ * checked.
+ */
+#define REF_HAVE_OLD   0x10
+
 /*
  * Try to read one refname component from the front of refname.
  * Return the length of the component found, or -1 if the component is
@@ -814,11 +841,6 @@ static void prime_ref_dir(struct ref_dir *dir)
        }
 }
 
-static int entry_matches(struct ref_entry *entry, const struct string_list *list)
-{
-       return list && string_list_has_string(list, entry->name);
-}
-
 struct nonmatching_ref_data {
        const struct string_list *skip;
        struct ref_entry *found;
@@ -828,7 +850,7 @@ static int nonmatching_ref_fn(struct ref_entry *entry, void *vdata)
 {
        struct nonmatching_ref_data *data = vdata;
 
-       if (entry_matches(entry, data->skip))
+       if (data->skip && string_list_has_string(data->skip, entry->name))
                return 0;
 
        data->found = entry;
@@ -849,9 +871,9 @@ static void report_refname_conflict(struct ref_entry *entry,
  * operation).
  *
  * Two reference names conflict if one of them exactly matches the
- * leading components of the other; e.g., "foo/bar" conflicts with
- * both "foo" and with "foo/bar/baz" but not with "foo/bar" or
- * "foo/barbados".
+ * leading components of the other; e.g., "refs/foo/bar" conflicts
+ * with both "refs/foo" and with "refs/foo/bar/baz" but not with
+ * "refs/foo/bar" or "refs/foo/barbados".
  *
  * skip must be sorted.
  */
@@ -860,23 +882,42 @@ static int is_refname_available(const char *refname,
                                struct ref_dir *dir)
 {
        const char *slash;
-       size_t len;
        int pos;
-       char *dirname;
+       struct strbuf dirname = STRBUF_INIT;
+
+       /*
+        * For the sake of comments in this function, suppose that
+        * refname is "refs/foo/bar".
+        */
 
        for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
                /*
-                * We are still at a leading dir of the refname; we are
-                * looking for a conflict with a leaf entry.
-                *
-                * If we find one, we still must make sure it is
-                * not in "skip".
+                * We are still at a leading dir of the refname (e.g.,
+                * "refs/foo"; if there is a reference with that name,
+                * it is a conflict, *unless* it is in skip.
                 */
                pos = search_ref_dir(dir, refname, slash - refname);
                if (pos >= 0) {
+                       /*
+                        * We found a reference whose name is a proper
+                        * prefix of refname; e.g., "refs/foo".
+                        */
                        struct ref_entry *entry = dir->entries[pos];
-                       if (entry_matches(entry, skip))
+                       if (skip && string_list_has_string(skip, entry->name)) {
+                               /*
+                                * The reference we just found, e.g.,
+                                * "refs/foo", is also in skip, so it
+                                * is not considered a conflict.
+                                * Moreover, the fact that "refs/foo"
+                                * exists means that there cannot be
+                                * any references anywhere under the
+                                * "refs/foo/" namespace (because they
+                                * would have conflicted with
+                                * "refs/foo"). So we can stop looking
+                                * now and return true.
+                                */
                                return 1;
+                       }
                        report_refname_conflict(entry, refname);
                        return 0;
                }
@@ -884,36 +925,45 @@ static int is_refname_available(const char *refname,
 
                /*
                 * Otherwise, we can try to continue our search with
-                * the next component; if we come up empty, we know
-                * there is nothing under this whole prefix.
+                * the next component. So try to look up the
+                * directory, e.g., "refs/foo/".
                 */
                pos = search_ref_dir(dir, refname, slash + 1 - refname);
-               if (pos < 0)
+               if (pos < 0) {
+                       /*
+                        * There was no directory "refs/foo/", so
+                        * there is nothing under this whole prefix,
+                        * and we are OK.
+                        */
                        return 1;
+               }
 
                dir = get_ref_dir(dir->entries[pos]);
        }
 
        /*
-        * We are at the leaf of our refname; we want to
-        * make sure there are no directories which match it.
+        * We are at the leaf of our refname (e.g., "refs/foo/bar").
+        * There is no point in searching for a reference with that
+        * name, because a refname isn't considered to conflict with
+        * itself. But we still need to check for references whose
+        * names are in the "refs/foo/bar/" namespace, because they
+        * *do* conflict.
         */
-       len = strlen(refname);
-       dirname = xmallocz(len + 1);
-       sprintf(dirname, "%s/", refname);
-       pos = search_ref_dir(dir, dirname, len + 1);
-       free(dirname);
+       strbuf_addstr(&dirname, refname);
+       strbuf_addch(&dirname, '/');
+       pos = search_ref_dir(dir, dirname.buf, dirname.len);
+       strbuf_release(&dirname);
 
        if (pos >= 0) {
                /*
-                * We found a directory named "refname". It is a
-                * problem iff it contains any ref that is not
-                * in "skip".
+                * We found a directory named "$refname/" (e.g.,
+                * "refs/foo/bar/"). It is a problem iff it contains
+                * any ref that is not in "skip".
                 */
-               struct ref_entry *entry = dir->entries[pos];
-               struct ref_dir *dir = get_ref_dir(entry);
                struct nonmatching_ref_data data;
+               struct ref_entry *entry = dir->entries[pos];
 
+               dir = get_ref_dir(entry);
                data.skip = skip;
                sort_ref_dir(dir);
                if (!do_for_each_entry_in_dir(dir, 0, nonmatching_ref_fn, &data))
@@ -923,11 +973,6 @@ static int is_refname_available(const char *refname,
                return 0;
        }
 
-       /*
-        * There is no point in searching for another leaf
-        * node which matches it; such an entry would be the
-        * ref we are looking for, not a conflict.
-        */
        return 1;
 }
 
@@ -2098,6 +2143,16 @@ int refname_match(const char *abbrev_name, const char *full_name)
        return 0;
 }
 
+static void unlock_ref(struct ref_lock *lock)
+{
+       /* 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);
+}
+
 /* This function should make sure errno is meaningful on error */
 static struct ref_lock *verify_lock(struct ref_lock *lock,
        const unsigned char *old_sha1, int mustexist)
@@ -2235,7 +2290,7 @@ int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
 static struct ref_lock *lock_ref_sha1_basic(const char *refname,
                                            const unsigned char *old_sha1,
                                            const struct string_list *skip,
-                                           int flags, int *type_p)
+                                           unsigned int flags, int *type_p)
 {
        char *ref_file;
        const char *orig_refname = refname;
@@ -2244,7 +2299,6 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
        int type, lflags;
        int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
        int resolve_flags = 0;
-       int missing = 0;
        int attempts_remaining = 3;
 
        lock = xcalloc(1, sizeof(struct ref_lock));
@@ -2283,13 +2337,13 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
                        orig_refname, strerror(errno));
                goto error_return;
        }
-       missing = is_null_sha1(lock->old_sha1);
-       /* When the ref did not exist and we are creating it,
-        * make sure there is no existing ref that is packed
-        * whose name begins with our refname, nor a ref whose
-        * name is a proper prefix of our 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
+        * refname, nor a packed ref whose name is a proper prefix of
+        * our refname.
         */
-       if (missing &&
+       if (is_null_sha1(lock->old_sha1) &&
             !is_refname_available(refname, skip, get_packed_refs(&ref_cache))) {
                last_errno = ENOTDIR;
                goto error_return;
@@ -2305,10 +2359,6 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
        lock->ref_name = xstrdup(refname);
        lock->orig_ref_name = xstrdup(orig_refname);
        ref_file = git_path("%s", refname);
-       if (missing)
-               lock->force_write = 1;
-       if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
-               lock->force_write = 1;
 
  retry:
        switch (safe_create_leading_directories(ref_file)) {
@@ -2350,13 +2400,6 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
        return NULL;
 }
 
-struct ref_lock *lock_any_ref_for_update(const char *refname,
-                                        const unsigned char *old_sha1,
-                                        int flags, int *type_p)
-{
-       return lock_ref_sha1_basic(refname, old_sha1, NULL, flags, type_p);
-}
-
 /*
  * Write an entry to the packed-refs file for the specified refname.
  * If peeled is non-NULL, write it as the entry's peeled value.
@@ -2556,7 +2599,7 @@ static void prune_ref(struct ref_to_prune *r)
        transaction = ref_transaction_begin(&err);
        if (!transaction ||
            ref_transaction_delete(transaction, r->name, r->sha1,
-                                  REF_ISPRUNING, 1, NULL, &err) ||
+                                  REF_ISPRUNING, NULL, &err) ||
            ref_transaction_commit(transaction, &err)) {
                ref_transaction_free(transaction);
                error("%s", err.buf);
@@ -2661,15 +2704,16 @@ static int delete_ref_loose(struct ref_lock *lock, int flag, struct strbuf *err)
        return 0;
 }
 
-int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
+int delete_ref(const char *refname, const unsigned char *sha1, unsigned int flags)
 {
        struct ref_transaction *transaction;
        struct strbuf err = STRBUF_INIT;
 
        transaction = ref_transaction_begin(&err);
        if (!transaction ||
-           ref_transaction_delete(transaction, refname, sha1, delopt,
-                                  sha1 && !is_null_sha1(sha1), NULL, &err) ||
+           ref_transaction_delete(transaction, refname,
+                                  (sha1 && !is_null_sha1(sha1)) ? sha1 : NULL,
+                                  flags, NULL, &err) ||
            ref_transaction_commit(transaction, &err)) {
                error("%s", err.buf);
                ref_transaction_free(transaction);
@@ -2805,7 +2849,6 @@ int rename_ref(const char *oldrefname, const char *newrefname, const char *logms
                error("unable to lock %s for update", newrefname);
                goto rollback;
        }
-       lock->force_write = 1;
        hashcpy(lock->old_sha1, orig_sha1);
        if (write_ref_sha1(lock, orig_sha1, logmsg)) {
                error("unable to write current sha1 into %s", newrefname);
@@ -2821,7 +2864,6 @@ int rename_ref(const char *oldrefname, const char *newrefname, const char *logms
                goto rollbacklog;
        }
 
-       lock->force_write = 1;
        flag = log_all_ref_updates;
        log_all_ref_updates = 0;
        if (write_ref_sha1(lock, orig_sha1, NULL))
@@ -2840,7 +2882,7 @@ int rename_ref(const char *oldrefname, const char *newrefname, const char *logms
        return 1;
 }
 
-int close_ref(struct ref_lock *lock)
+static int close_ref(struct ref_lock *lock)
 {
        if (close_lock_file(lock->lk))
                return -1;
@@ -2848,7 +2890,7 @@ int close_ref(struct ref_lock *lock)
        return 0;
 }
 
-int commit_ref(struct ref_lock *lock)
+static int commit_ref(struct ref_lock *lock)
 {
        if (commit_lock_file(lock->lk))
                return -1;
@@ -2856,16 +2898,6 @@ int commit_ref(struct ref_lock *lock)
        return 0;
 }
 
-void unlock_ref(struct ref_lock *lock)
-{
-       /* 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);
-}
-
 /*
  * copy the reflog message msg to buf, which has been allocated sufficiently
  * large, while cleaning up the whitespaces.  Especially, convert LF to space,
@@ -2942,15 +2974,37 @@ int log_ref_setup(const char *refname, char *logfile, int bufsize)
        return 0;
 }
 
+static int log_ref_write_fd(int fd, const unsigned char *old_sha1,
+                           const unsigned char *new_sha1,
+                           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 = sprintf(logrec, "%s %s %s\n",
+                     sha1_to_hex(old_sha1),
+                     sha1_to_hex(new_sha1),
+                     committer);
+       if (msglen)
+               len += copy_msg(logrec + len - 1, msg) - 1;
+
+       written = len <= maxlen ? write_in_full(fd, logrec, len) : -1;
+       free(logrec);
+       if (written != len)
+               return -1;
+
+       return 0;
+}
+
 static int log_ref_write(const char *refname, const unsigned char *old_sha1,
                         const unsigned char *new_sha1, const char *msg)
 {
-       int logfd, result, written, oflags = O_APPEND | O_WRONLY;
-       unsigned maxlen, len;
-       int msglen;
+       int logfd, result, oflags = O_APPEND | O_WRONLY;
        char log_file[PATH_MAX];
-       char *logrec;
-       const char *committer;
 
        if (log_all_ref_updates < 0)
                log_all_ref_updates = !is_bare_repository();
@@ -2962,19 +3016,9 @@ static int log_ref_write(const char *refname, const unsigned char *old_sha1,
        logfd = open(log_file, oflags);
        if (logfd < 0)
                return 0;
-       msglen = msg ? strlen(msg) : 0;
-       committer = git_committer_info(0);
-       maxlen = strlen(committer) + msglen + 100;
-       logrec = xmalloc(maxlen);
-       len = sprintf(logrec, "%s %s %s\n",
-                     sha1_to_hex(old_sha1),
-                     sha1_to_hex(new_sha1),
-                     committer);
-       if (msglen)
-               len += copy_msg(logrec + len - 1, msg) - 1;
-       written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
-       free(logrec);
-       if (written != len) {
+       result = log_ref_write_fd(logfd, old_sha1, new_sha1,
+                                 git_committer_info(0), msg);
+       if (result) {
                int save_errno = errno;
                close(logfd);
                error("Unable to append to %s", log_file);
@@ -3005,14 +3049,6 @@ static int write_ref_sha1(struct ref_lock *lock,
        static char term = '\n';
        struct object *o;
 
-       if (!lock) {
-               errno = EINVAL;
-               return -1;
-       }
-       if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
-               unlock_ref(lock);
-               return 0;
-       }
        o = parse_object(sha1);
        if (!o) {
                error("Trying to write ref %s with nonexistent object %s",
@@ -3482,16 +3518,27 @@ int for_each_reflog(each_ref_fn fn, void *cb_data)
 }
 
 /**
- * Information needed for a single ref update.  Set new_sha1 to the
- * new value or to zero to delete the ref.  To check the old value
- * while locking the ref, set have_old to 1 and set old_sha1 to the
- * value or to zero to ensure the ref does not exist before update.
+ * Information needed for a single ref update. Set new_sha1 to the new
+ * value or to null_sha1 to delete the ref. To check the old value
+ * while the ref is locked, set (flags & REF_HAVE_OLD) and set
+ * old_sha1 to the old value, or to null_sha1 to ensure the ref does
+ * not exist before update.
  */
 struct ref_update {
+       /*
+        * If (flags & REF_HAVE_NEW), set the reference to this value:
+        */
        unsigned char new_sha1[20];
+       /*
+        * If (flags & REF_HAVE_OLD), check that the reference
+        * previously had this value:
+        */
        unsigned char old_sha1[20];
-       int flags; /* REF_NODEREF? */
-       int have_old; /* 1 if old_sha1 is valid, 0 otherwise */
+       /*
+        * One or more of REF_HAVE_NEW, REF_HAVE_OLD, REF_NODEREF,
+        * REF_DELETING, and REF_ISPRUNING:
+        */
+       unsigned int flags;
        struct ref_lock *lock;
        int type;
        char *msg;
@@ -3563,7 +3610,7 @@ int ref_transaction_update(struct ref_transaction *transaction,
                           const char *refname,
                           const unsigned char *new_sha1,
                           const unsigned char *old_sha1,
-                          int flags, int have_old, const char *msg,
+                          unsigned int flags, const char *msg,
                           struct strbuf *err)
 {
        struct ref_update *update;
@@ -3573,10 +3620,7 @@ int ref_transaction_update(struct ref_transaction *transaction,
        if (transaction->state != REF_TRANSACTION_OPEN)
                die("BUG: update called for transaction that is not open");
 
-       if (have_old && !old_sha1)
-               die("BUG: have_old is true but old_sha1 is NULL");
-
-       if (!is_null_sha1(new_sha1) &&
+       if (new_sha1 && !is_null_sha1(new_sha1) &&
            check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
                strbuf_addf(err, "refusing to update ref with bad name %s",
                            refname);
@@ -3584,11 +3628,15 @@ int ref_transaction_update(struct ref_transaction *transaction,
        }
 
        update = add_update(transaction, refname);
-       hashcpy(update->new_sha1, new_sha1);
-       update->flags = flags;
-       update->have_old = have_old;
-       if (have_old)
+       if (new_sha1) {
+               hashcpy(update->new_sha1, new_sha1);
+               flags |= REF_HAVE_NEW;
+       }
+       if (old_sha1) {
                hashcpy(update->old_sha1, old_sha1);
+               flags |= REF_HAVE_OLD;
+       }
+       update->flags = flags;
        if (msg)
                update->msg = xstrdup(msg);
        return 0;
@@ -3597,75 +3645,52 @@ int ref_transaction_update(struct ref_transaction *transaction,
 int ref_transaction_create(struct ref_transaction *transaction,
                           const char *refname,
                           const unsigned char *new_sha1,
-                          int flags, const char *msg,
+                          unsigned int flags, const char *msg,
                           struct strbuf *err)
 {
-       struct ref_update *update;
-
-       assert(err);
-
-       if (transaction->state != REF_TRANSACTION_OPEN)
-               die("BUG: create called for transaction that is not open");
-
        if (!new_sha1 || is_null_sha1(new_sha1))
-               die("BUG: create ref with null new_sha1");
-
-       if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
-               strbuf_addf(err, "refusing to create ref with bad name %s",
-                           refname);
-               return -1;
-       }
-
-       update = add_update(transaction, refname);
-
-       hashcpy(update->new_sha1, new_sha1);
-       hashclr(update->old_sha1);
-       update->flags = flags;
-       update->have_old = 1;
-       if (msg)
-               update->msg = xstrdup(msg);
-       return 0;
+               die("BUG: create called without valid new_sha1");
+       return ref_transaction_update(transaction, refname, new_sha1,
+                                     null_sha1, flags, msg, err);
 }
 
 int ref_transaction_delete(struct ref_transaction *transaction,
                           const char *refname,
                           const unsigned char *old_sha1,
-                          int flags, int have_old, const char *msg,
+                          unsigned int flags, const char *msg,
                           struct strbuf *err)
 {
-       struct ref_update *update;
-
-       assert(err);
-
-       if (transaction->state != REF_TRANSACTION_OPEN)
-               die("BUG: delete called for transaction that is not open");
-
-       if (have_old && !old_sha1)
-               die("BUG: have_old is true but old_sha1 is NULL");
+       if (old_sha1 && is_null_sha1(old_sha1))
+               die("BUG: delete called with old_sha1 set to zeros");
+       return ref_transaction_update(transaction, refname,
+                                     null_sha1, old_sha1,
+                                     flags, msg, err);
+}
 
-       update = add_update(transaction, refname);
-       update->flags = flags;
-       update->have_old = have_old;
-       if (have_old) {
-               assert(!is_null_sha1(old_sha1));
-               hashcpy(update->old_sha1, old_sha1);
-       }
-       if (msg)
-               update->msg = xstrdup(msg);
-       return 0;
+int ref_transaction_verify(struct ref_transaction *transaction,
+                          const char *refname,
+                          const unsigned char *old_sha1,
+                          unsigned int flags,
+                          struct strbuf *err)
+{
+       if (!old_sha1)
+               die("BUG: verify called with old_sha1 set to NULL");
+       return ref_transaction_update(transaction, refname,
+                                     NULL, old_sha1,
+                                     flags, NULL, err);
 }
 
-int update_ref(const char *action, const char *refname,
-              const unsigned char *sha1, const unsigned char *oldval,
-              int flags, enum action_on_err onerr)
+int update_ref(const char *msg, const char *refname,
+              const unsigned char *new_sha1, const unsigned char *old_sha1,
+              unsigned int flags, enum action_on_err onerr)
 {
        struct ref_transaction *t;
        struct strbuf err = STRBUF_INIT;
 
        t = ref_transaction_begin(&err);
        if (!t ||
-           ref_transaction_update(t, refname, sha1, oldval, flags,
-                                  !!oldval, action, &err) ||
+           ref_transaction_update(t, refname, new_sha1, old_sha1,
+                                  flags, msg, &err) ||
            ref_transaction_commit(t, &err)) {
                const char *str = "update_ref failed for ref '%s': %s";
 
@@ -3741,17 +3766,17 @@ int ref_transaction_commit(struct ref_transaction *transaction,
        /* Acquire all locks while verifying old values */
        for (i = 0; i < n; i++) {
                struct ref_update *update = updates[i];
-               int flags = update->flags;
+               unsigned int flags = update->flags;
 
-               if (is_null_sha1(update->new_sha1))
+               if ((flags & REF_HAVE_NEW) && is_null_sha1(update->new_sha1))
                        flags |= REF_DELETING;
-               update->lock = lock_ref_sha1_basic(update->refname,
-                                                  (update->have_old ?
-                                                   update->old_sha1 :
-                                                   NULL),
-                                                  NULL,
-                                                  flags,
-                                                  &update->type);
+               update->lock = lock_ref_sha1_basic(
+                               update->refname,
+                               ((update->flags & REF_HAVE_OLD) ?
+                                update->old_sha1 : NULL),
+                               NULL,
+                               flags,
+                               &update->type);
                if (!update->lock) {
                        ret = (errno == ENOTDIR)
                                ? TRANSACTION_NAME_CONFLICT
@@ -3765,31 +3790,46 @@ int ref_transaction_commit(struct ref_transaction *transaction,
        /* Perform updates first so live commits remain referenced */
        for (i = 0; i < n; i++) {
                struct ref_update *update = updates[i];
+               int flags = update->flags;
+
+               if ((flags & REF_HAVE_NEW) && !is_null_sha1(update->new_sha1)) {
+                       int overwriting_symref = ((update->type & REF_ISSYMREF) &&
+                                                 (update->flags & REF_NODEREF));
 
-               if (!is_null_sha1(update->new_sha1)) {
-                       if (write_ref_sha1(update->lock, update->new_sha1,
-                                          update->msg)) {
+                       if (!overwriting_symref
+                           && !hashcmp(update->lock->old_sha1, update->new_sha1)) {
+                               /*
+                                * The reference already has the desired
+                                * value, so we don't need to write it.
+                                */
+                               unlock_ref(update->lock);
+                               update->lock = NULL;
+                       } else if (write_ref_sha1(update->lock, update->new_sha1,
+                                                 update->msg)) {
                                update->lock = NULL; /* freed by write_ref_sha1 */
                                strbuf_addf(err, "Cannot update the ref '%s'.",
                                            update->refname);
                                ret = TRANSACTION_GENERIC_ERROR;
                                goto cleanup;
+                       } else {
+                               /* freed by write_ref_sha1(): */
+                               update->lock = NULL;
                        }
-                       update->lock = NULL; /* freed by write_ref_sha1 */
                }
        }
 
        /* Perform deletes now that updates are safely completed */
        for (i = 0; i < n; i++) {
                struct ref_update *update = updates[i];
+               int flags = update->flags;
 
-               if (update->lock) {
+               if ((flags & REF_HAVE_NEW) && is_null_sha1(update->new_sha1)) {
                        if (delete_ref_loose(update->lock, update->type, err)) {
                                ret = TRANSACTION_GENERIC_ERROR;
                                goto cleanup;
                        }
 
-                       if (!(update->flags & REF_ISPRUNING))
+                       if (!(flags & REF_ISPRUNING))
                                string_list_append(&refs_to_delete,
                                                   update->lock->ref_name);
                }
@@ -3948,3 +3988,141 @@ int ref_is_hidden(const char *refname)
        }
        return 0;
 }
+
+struct expire_reflog_cb {
+       unsigned int flags;
+       reflog_expiry_should_prune_fn *should_prune_fn;
+       void *policy_cb;
+       FILE *newlog;
+       unsigned char last_kept_sha1[20];
+};
+
+static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
+                            const char *email, unsigned long timestamp, int tz,
+                            const char *message, void *cb_data)
+{
+       struct expire_reflog_cb *cb = cb_data;
+       struct expire_reflog_policy_cb *policy_cb = cb->policy_cb;
+
+       if (cb->flags & EXPIRE_REFLOGS_REWRITE)
+               osha1 = cb->last_kept_sha1;
+
+       if ((*cb->should_prune_fn)(osha1, nsha1, email, timestamp, tz,
+                                  message, policy_cb)) {
+               if (!cb->newlog)
+                       printf("would prune %s", message);
+               else if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
+                       printf("prune %s", message);
+       } else {
+               if (cb->newlog) {
+                       fprintf(cb->newlog, "%s %s %s %lu %+05d\t%s",
+                               sha1_to_hex(osha1), sha1_to_hex(nsha1),
+                               email, timestamp, tz, message);
+                       hashcpy(cb->last_kept_sha1, nsha1);
+               }
+               if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
+                       printf("keep %s", message);
+       }
+       return 0;
+}
+
+int reflog_expire(const char *refname, const unsigned char *sha1,
+                unsigned int flags,
+                reflog_expiry_prepare_fn prepare_fn,
+                reflog_expiry_should_prune_fn should_prune_fn,
+                reflog_expiry_cleanup_fn cleanup_fn,
+                void *policy_cb_data)
+{
+       static struct lock_file reflog_lock;
+       struct expire_reflog_cb cb;
+       struct ref_lock *lock;
+       char *log_file;
+       int status = 0;
+       int type;
+
+       memset(&cb, 0, sizeof(cb));
+       cb.flags = flags;
+       cb.policy_cb = policy_cb_data;
+       cb.should_prune_fn = should_prune_fn;
+
+       /*
+        * The reflog file is locked by holding the lock on the
+        * reference itself, plus we might need to update the
+        * reference if --updateref was specified:
+        */
+       lock = lock_ref_sha1_basic(refname, sha1, NULL, 0, &type);
+       if (!lock)
+               return error("cannot lock ref '%s'", refname);
+       if (!reflog_exists(refname)) {
+               unlock_ref(lock);
+               return 0;
+       }
+
+       log_file = git_pathdup("logs/%s", refname);
+       if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
+               /*
+                * Even though holding $GIT_DIR/logs/$reflog.lock has
+                * no locking implications, we use the lock_file
+                * machinery here anyway because it does a lot of the
+                * work we need, including cleaning up if the program
+                * exits unexpectedly.
+                */
+               if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) {
+                       struct strbuf err = STRBUF_INIT;
+                       unable_to_lock_message(log_file, errno, &err);
+                       error("%s", err.buf);
+                       strbuf_release(&err);
+                       goto failure;
+               }
+               cb.newlog = fdopen_lock_file(&reflog_lock, "w");
+               if (!cb.newlog) {
+                       error("cannot fdopen %s (%s)",
+                             reflog_lock.filename.buf, strerror(errno));
+                       goto failure;
+               }
+       }
+
+       (*prepare_fn)(refname, sha1, cb.policy_cb);
+       for_each_reflog_ent(refname, expire_reflog_ent, &cb);
+       (*cleanup_fn)(cb.policy_cb);
+
+       if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
+               /*
+                * It doesn't make sense to adjust a reference pointed
+                * to by a symbolic ref based on expiring entries in
+                * the symbolic reference's reflog. Nor can we update
+                * a reference if there are no remaining reflog
+                * entries.
+                */
+               int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) &&
+                       !(type & REF_ISSYMREF) &&
+                       !is_null_sha1(cb.last_kept_sha1);
+
+               if (close_lock_file(&reflog_lock)) {
+                       status |= error("couldn't write %s: %s", log_file,
+                                       strerror(errno));
+               } else if (update &&
+                       (write_in_full(lock->lock_fd,
+                               sha1_to_hex(cb.last_kept_sha1), 40) != 40 ||
+                        write_str_in_full(lock->lock_fd, "\n") != 1 ||
+                        close_ref(lock) < 0)) {
+                       status |= error("couldn't write %s",
+                                       lock->lk->filename.buf);
+                       rollback_lock_file(&reflog_lock);
+               } else if (commit_lock_file(&reflog_lock)) {
+                       status |= error("unable to commit reflog '%s' (%s)",
+                                       log_file, strerror(errno));
+               } else if (update && commit_ref(lock)) {
+                       status |= error("couldn't set %s", lock->ref_name);
+               }
+       }
+       free(log_file);
+       unlock_ref(lock);
+       return status;
+
+ failure:
+       rollback_lock_file(&reflog_lock);
+       free(log_file);
+       unlock_ref(lock);
+       return -1;
+}