git-add --intent-to-add (-N)
[gitweb.git] / builtin-reflog.c
index ab53c8cb7c08298c3ab0f69bf600a70385dafa64..6b3667ef0ebdfc2b8b70b24e474b22989fbf0cb7 100644 (file)
@@ -13,7 +13,9 @@
  */
 
 static const char reflog_expire_usage[] =
-"git-reflog (show|expire) [--verbose] [--dry-run] [--stale-fix] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";
+"git reflog (show|expire) [--verbose] [--dry-run] [--stale-fix] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";
+static const char reflog_delete_usage[] =
+"git reflog delete [--verbose] [--dry-run] [--rewrite] [--updateref] <refs>...";
 
 static unsigned long default_reflog_expire;
 static unsigned long default_reflog_expire_unreachable;
@@ -22,9 +24,12 @@ struct cmd_reflog_expire_cb {
        struct rev_info revs;
        int dry_run;
        int stalefix;
+       int rewrite;
+       int updateref;
        int verbose;
        unsigned long expire_total;
        unsigned long expire_unreachable;
+       int recno;
 };
 
 struct expire_reflog_cb {
@@ -32,6 +37,7 @@ struct expire_reflog_cb {
        const char *ref;
        struct commit *ref_commit;
        struct cmd_reflog_expire_cb *cmd;
+       unsigned char last_kept_sha1[20];
 };
 
 struct collected_reflog {
@@ -213,6 +219,9 @@ static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
        if (timestamp < cb->cmd->expire_total)
                goto prune;
 
+       if (cb->cmd->rewrite)
+               osha1 = cb->last_kept_sha1;
+
        old = new = NULL;
        if (cb->cmd->stalefix &&
            (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1)))
@@ -230,6 +239,9 @@ static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
                        goto prune;
        }
 
+       if (cb->cmd->recno && --(cb->cmd->recno) == 0)
+               goto prune;
+
        if (cb->newlog) {
                char sign = (tz < 0) ? '-' : '+';
                int zone = (tz < 0) ? (-tz) : tz;
@@ -237,6 +249,7 @@ static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
                        sha1_to_hex(osha1), sha1_to_hex(nsha1),
                        email, timestamp, sign, zone,
                        message);
+               hashcpy(cb->last_kept_sha1, nsha1);
        }
        if (cb->cmd->verbose)
                printf("keep %s", message);
@@ -256,7 +269,9 @@ static int expire_reflog(const char *ref, const unsigned char *sha1, int unused,
        int status = 0;
 
        memset(&cb, 0, sizeof(cb));
-       /* we take the lock for the ref itself to prevent it from
+
+       /*
+        * we take the lock for the ref itself to prevent it from
         * getting updated.
         */
        lock = lock_any_ref_for_update(ref, sha1, 0);
@@ -280,10 +295,22 @@ static int expire_reflog(const char *ref, const unsigned char *sha1, int unused,
                        status |= error("%s: %s", strerror(errno),
                                        newlog_path);
                        unlink(newlog_path);
+               } else if (cmd->updateref &&
+                       (write_in_full(lock->lock_fd,
+                               sha1_to_hex(cb.last_kept_sha1), 40) != 40 ||
+                        write_in_full(lock->lock_fd, "\n", 1) != 1 ||
+                        close_ref(lock) < 0)) {
+                       status |= error("Couldn't write %s",
+                               lock->lk->filename);
+                       unlink(newlog_path);
                } else if (rename(newlog_path, log_file)) {
                        status |= error("cannot rename %s to %s",
                                        newlog_path, log_file);
                        unlink(newlog_path);
+               } else if (cmd->updateref && commit_ref(lock)) {
+                       status |= error("Couldn't set %s", lock->ref_name);
+               } else {
+                       adjust_shared_perm(log_file);
                }
        }
        free(newlog_path);
@@ -306,21 +333,130 @@ static int collect_reflog(const char *ref, const unsigned char *sha1, int unused
        return 0;
 }
 
-static int reflog_expire_config(const char *var, const char *value)
+static struct reflog_expire_cfg {
+       struct reflog_expire_cfg *next;
+       unsigned long expire_total;
+       unsigned long expire_unreachable;
+       size_t len;
+       char pattern[FLEX_ARRAY];
+} *reflog_expire_cfg, **reflog_expire_cfg_tail;
+
+static struct reflog_expire_cfg *find_cfg_ent(const char *pattern, size_t len)
+{
+       struct reflog_expire_cfg *ent;
+
+       if (!reflog_expire_cfg_tail)
+               reflog_expire_cfg_tail = &reflog_expire_cfg;
+
+       for (ent = reflog_expire_cfg; ent; ent = ent->next)
+               if (ent->len == len &&
+                   !memcmp(ent->pattern, pattern, len))
+                       return ent;
+
+       ent = xcalloc(1, (sizeof(*ent) + len));
+       memcpy(ent->pattern, pattern, len);
+       ent->len = len;
+       *reflog_expire_cfg_tail = ent;
+       reflog_expire_cfg_tail = &(ent->next);
+       return ent;
+}
+
+static int parse_expire_cfg_value(const char *var, const char *value, unsigned long *expire)
 {
-       if (!strcmp(var, "gc.reflogexpire")) {
-               if (!value)
-                       config_error_nonbool(var);
-               default_reflog_expire = approxidate(value);
+       if (!value)
+               return config_error_nonbool(var);
+       if (!strcmp(value, "never") || !strcmp(value, "false")) {
+               *expire = 0;
                return 0;
        }
-       if (!strcmp(var, "gc.reflogexpireunreachable")) {
-               if (!value)
-                       config_error_nonbool(var);
-               default_reflog_expire_unreachable = approxidate(value);
+       *expire = approxidate(value);
+       return 0;
+}
+
+/* expiry timer slot */
+#define EXPIRE_TOTAL   01
+#define EXPIRE_UNREACH 02
+
+static int reflog_expire_config(const char *var, const char *value, void *cb)
+{
+       const char *lastdot = strrchr(var, '.');
+       unsigned long expire;
+       int slot;
+       struct reflog_expire_cfg *ent;
+
+       if (!lastdot || prefixcmp(var, "gc."))
+               return git_default_config(var, value, cb);
+
+       if (!strcmp(lastdot, ".reflogexpire")) {
+               slot = EXPIRE_TOTAL;
+               if (parse_expire_cfg_value(var, value, &expire))
+                       return -1;
+       } else if (!strcmp(lastdot, ".reflogexpireunreachable")) {
+               slot = EXPIRE_UNREACH;
+               if (parse_expire_cfg_value(var, value, &expire))
+                       return -1;
+       } else
+               return git_default_config(var, value, cb);
+
+       if (lastdot == var + 2) {
+               switch (slot) {
+               case EXPIRE_TOTAL:
+                       default_reflog_expire = expire;
+                       break;
+               case EXPIRE_UNREACH:
+                       default_reflog_expire_unreachable = expire;
+                       break;
+               }
                return 0;
        }
-       return git_default_config(var, value);
+
+       ent = find_cfg_ent(var + 3, lastdot - (var+3));
+       if (!ent)
+               return -1;
+       switch (slot) {
+       case EXPIRE_TOTAL:
+               ent->expire_total = expire;
+               break;
+       case EXPIRE_UNREACH:
+               ent->expire_unreachable = expire;
+               break;
+       }
+       return 0;
+}
+
+static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, const char *ref)
+{
+       struct reflog_expire_cfg *ent;
+
+       if (slot == (EXPIRE_TOTAL|EXPIRE_UNREACH))
+               return; /* both given explicitly -- nothing to tweak */
+
+       for (ent = reflog_expire_cfg; ent; ent = ent->next) {
+               if (!fnmatch(ent->pattern, ref, 0)) {
+                       if (!(slot & EXPIRE_TOTAL))
+                               cb->expire_total = ent->expire_total;
+                       if (!(slot & EXPIRE_UNREACH))
+                               cb->expire_unreachable = ent->expire_unreachable;
+                       return;
+               }
+       }
+
+       /*
+        * If unconfigured, make stash never expire
+        */
+       if (!strcmp(ref, "refs/stash")) {
+               if (!(slot & EXPIRE_TOTAL))
+                       cb->expire_total = 0;
+               if (!(slot & EXPIRE_UNREACH))
+                       cb->expire_unreachable = 0;
+               return;
+       }
+
+       /* Nothing matched -- use the default value */
+       if (!(slot & EXPIRE_TOTAL))
+               cb->expire_total = default_reflog_expire;
+       if (!(slot & EXPIRE_UNREACH))
+               cb->expire_unreachable = default_reflog_expire_unreachable;
 }
 
 static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
@@ -328,8 +464,9 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
        struct cmd_reflog_expire_cb cb;
        unsigned long now = time(NULL);
        int i, status, do_all;
+       int explicit_expiry = 0;
 
-       git_config(reflog_expire_config);
+       git_config(reflog_expire_config, NULL);
 
        save_commit_buffer = 0;
        do_all = status = 0;
@@ -342,22 +479,24 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
        cb.expire_total = default_reflog_expire;
        cb.expire_unreachable = default_reflog_expire_unreachable;
 
-       /*
-        * We can trust the commits and objects reachable from refs
-        * even in older repository.  We cannot trust what's reachable
-        * from reflog if the repository was pruned with older git.
-        */
-
        for (i = 1; i < argc; i++) {
                const char *arg = argv[i];
                if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
                        cb.dry_run = 1;
-               else if (!prefixcmp(arg, "--expire="))
+               else if (!prefixcmp(arg, "--expire=")) {
                        cb.expire_total = approxidate(arg + 9);
-               else if (!prefixcmp(arg, "--expire-unreachable="))
+                       explicit_expiry |= EXPIRE_TOTAL;
+               }
+               else if (!prefixcmp(arg, "--expire-unreachable=")) {
                        cb.expire_unreachable = approxidate(arg + 21);
+                       explicit_expiry |= EXPIRE_UNREACH;
+               }
                else if (!strcmp(arg, "--stale-fix"))
                        cb.stalefix = 1;
+               else if (!strcmp(arg, "--rewrite"))
+                       cb.rewrite = 1;
+               else if (!strcmp(arg, "--updateref"))
+                       cb.updateref = 1;
                else if (!strcmp(arg, "--all"))
                        do_all = 1;
                else if (!strcmp(arg, "--verbose"))
@@ -371,6 +510,12 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
                else
                        break;
        }
+
+       /*
+        * We can trust the commits and objects reachable from refs
+        * even in older repository.  We cannot trust what's reachable
+        * from reflog if the repository was pruned with older git.
+        */
        if (cb.stalefix) {
                init_revisions(&cb.revs, prefix);
                if (cb.verbose)
@@ -388,30 +533,104 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
                for_each_reflog(collect_reflog, &collected);
                for (i = 0; i < collected.nr; i++) {
                        struct collected_reflog *e = collected.e[i];
+                       set_reflog_expiry_param(&cb, explicit_expiry, e->reflog);
                        status |= expire_reflog(e->reflog, e->sha1, 0, &cb);
                        free(e);
                }
                free(collected.e);
        }
 
-       while (i < argc) {
-               const char *ref = argv[i++];
+       for (; i < argc; i++) {
+               char *ref;
                unsigned char sha1[20];
-               if (!resolve_ref(ref, sha1, 1, NULL)) {
-                       status |= error("%s points nowhere!", ref);
+               if (!dwim_log(argv[i], strlen(argv[i]), sha1, &ref)) {
+                       status |= error("%s points nowhere!", argv[i]);
                        continue;
                }
+               set_reflog_expiry_param(&cb, explicit_expiry, ref);
                status |= expire_reflog(ref, sha1, 0, &cb);
        }
        return status;
 }
 
+static int count_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
+               const char *email, unsigned long timestamp, int tz,
+               const char *message, void *cb_data)
+{
+       struct cmd_reflog_expire_cb *cb = cb_data;
+       if (!cb->expire_total || timestamp < cb->expire_total)
+               cb->recno++;
+       return 0;
+}
+
+static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
+{
+       struct cmd_reflog_expire_cb cb;
+       int i, status = 0;
+
+       memset(&cb, 0, sizeof(cb));
+
+       for (i = 1; i < argc; i++) {
+               const char *arg = argv[i];
+               if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
+                       cb.dry_run = 1;
+               else if (!strcmp(arg, "--rewrite"))
+                       cb.rewrite = 1;
+               else if (!strcmp(arg, "--updateref"))
+                       cb.updateref = 1;
+               else if (!strcmp(arg, "--verbose"))
+                       cb.verbose = 1;
+               else if (!strcmp(arg, "--")) {
+                       i++;
+                       break;
+               }
+               else if (arg[0] == '-')
+                       usage(reflog_delete_usage);
+               else
+                       break;
+       }
+
+       if (argc - i < 1)
+               return error("Nothing to delete?");
+
+       for ( ; i < argc; i++) {
+               const char *spec = strstr(argv[i], "@{");
+               unsigned char sha1[20];
+               char *ep, *ref;
+               int recno;
+
+               if (!spec) {
+                       status |= error("Not a reflog: %s", argv[i]);
+                       continue;
+               }
+
+               if (!dwim_log(argv[i], spec - argv[i], sha1, &ref)) {
+                       status |= error("no reflog for '%s'", argv[i]);
+                       continue;
+               }
+
+               recno = strtoul(spec + 2, &ep, 10);
+               if (*ep == '}') {
+                       cb.recno = -recno;
+                       for_each_reflog_ent(ref, count_reflog_ent, &cb);
+               } else {
+                       cb.expire_total = approxidate(spec + 2);
+                       for_each_reflog_ent(ref, count_reflog_ent, &cb);
+                       cb.expire_total = 0;
+               }
+
+               status |= expire_reflog(ref, sha1, 0, &cb);
+               free(ref);
+       }
+       return status;
+}
+
 /*
  * main "reflog"
  */
 
 static const char reflog_usage[] =
-"git-reflog (expire | ...)";
+"git reflog (expire | ...)";
 
 int cmd_reflog(int argc, const char **argv, const char *prefix)
 {
@@ -425,6 +644,9 @@ int cmd_reflog(int argc, const char **argv, const char *prefix)
        if (!strcmp(argv[1], "expire"))
                return cmd_reflog_expire(argc - 1, argv + 1, prefix);
 
+       if (!strcmp(argv[1], "delete"))
+               return cmd_reflog_delete(argc - 1, argv + 1, prefix);
+
        /* Not a recognized reflog command..*/
        usage(reflog_usage);
 }