Per-ref reflog expiry configuration

In addition to gc.reflogexpireunreachable and gc.reflogexpire, this lets
you set gc.<pattern>.reflogexpireunreachable and gc.<pattern>.reflogexpire
variables.

When "git reflog expire" expires reflog entry for $ref, the expiry timers
are taken from the first <pattern> that matches $ref (and if there isn't
the global default value is used).

For example, you could:

	[gc "refs/stash"]
		reflogexpire = never
		reflogexpireunreachable = never

	[gc "refs/remotes/*"]
		reflogexpire = 7 days
		reflogexpireunreachable = 3 days

	[gc]
		reflogexpire = 90 days
		reflogexpireunreachable = 30 days

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-reflog.c b/builtin-reflog.c
index b151e24ff94e06840db7e57014fe4a73ea811575..0711728908f8e387fb061e537ab4a72f8feb63aa 100644 (file)
--- a/builtin-reflog.c
+++ b/builtin-reflog.c
@@ -269,7 +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);
@@ -331,21 +333,119 @@ 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, void *cb)
+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)
 {
-       if (!strcmp(var, "gc.reflogexpire")) {
-               if (!value)
-                       config_error_nonbool(var);
-               default_reflog_expire = approxidate(value);
+       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 (!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, cb);
+
+       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;
+               }
+       }
+
+       /* 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)
@@ -353,6 +453,7 @@ 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, NULL);
 
@@ -367,20 +468,18 @@ 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"))
@@ -400,6 +499,12 @@ 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)
@@ -417,6 +522,7 @@ 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);
                }
@@ -430,6 +536,7 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
                        status |= error("%s points nowhere!", ref);
                        continue;
                }
+               set_reflog_expiry_param(&cb, explicit_expiry, ref);
                status |= expire_reflog(ref, sha1, 0, &cb);
        }
        return status;