text: #include "builtin.h"
  #include "config.h"
  #include "lockfile.h"
  #include "commit.h"
  #include "refs.h"
  #include "dir.h"
  #include "tree-walk.h"
  #include "diff.h"
  #include "revision.h"
  #include "reachable.h"
  
  /* NEEDSWORK: switch to using parse_options */
  static const char reflog_expire_usage[] =
  "git reflog expire [--expire=<time>] [--expire-unreachable=<time>] [--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] [--verbose] [--all] <refs>...";
  static const char reflog_delete_usage[] =
  "git reflog delete [--rewrite] [--updateref] [--dry-run | -n] [--verbose] <refs>...";
  static const char reflog_exists_usage[] =
  "git reflog exists <ref>";
  
  static timestamp_t default_reflog_expire;
  static timestamp_t default_reflog_expire_unreachable;
  
  struct cmd_reflog_expire_cb {
  	struct rev_info revs;
  	int stalefix;
  	timestamp_t expire_total;
  	timestamp_t expire_unreachable;
  	int recno;
  };
  
  struct expire_reflog_policy_cb {
  	enum {
  		UE_NORMAL,
  		UE_ALWAYS,
  		UE_HEAD
  	} unreachable_expire_kind;
  	struct commit_list *mark_list;
  	unsigned long mark_limit;
  	struct cmd_reflog_expire_cb cmd;
  	struct commit *tip_commit;
  	struct commit_list *tips;
  };
  
  struct collected_reflog {
  	unsigned char sha1[20];
  	char reflog[FLEX_ARRAY];
  };
  
  struct collect_reflog_cb {
  	struct collected_reflog **e;
  	int alloc;
  	int nr;
  };
  
  #define INCOMPLETE	(1u<<10)
  #define STUDYING	(1u<<11)
  #define REACHABLE	(1u<<12)
  
  static int tree_is_complete(const struct object_id *oid)
  {
  	struct tree_desc desc;
  	struct name_entry entry;
  	int complete;
  	struct tree *tree;
  
  	tree = lookup_tree(oid);
  	if (!tree)
  		return 0;
  	if (tree->object.flags & SEEN)
  		return 1;
  	if (tree->object.flags & INCOMPLETE)
  		return 0;
  
  	if (!tree->buffer) {
  		enum object_type type;
  		unsigned long size;
  		void *data = read_sha1_file(oid->hash, &type, &size);
  		if (!data) {
  			tree->object.flags |= INCOMPLETE;
  			return 0;
  		}
  		tree->buffer = data;
  		tree->size = size;
  	}
  	init_tree_desc(&desc, tree->buffer, tree->size);
  	complete = 1;
  	while (tree_entry(&desc, &entry)) {
  		if (!has_sha1_file(entry.oid->hash) ||
  		    (S_ISDIR(entry.mode) && !tree_is_complete(entry.oid))) {
  			tree->object.flags |= INCOMPLETE;
  			complete = 0;
  		}
  	}
  	free_tree_buffer(tree);
  
  	if (complete)
  		tree->object.flags |= SEEN;
  	return complete;
  }
  
  static int commit_is_complete(struct commit *commit)
  {
  	struct object_array study;
  	struct object_array found;
  	int is_incomplete = 0;
  	int i;
  
  	/* early return */
  	if (commit->object.flags & SEEN)
  		return 1;
  	if (commit->object.flags & INCOMPLETE)
  		return 0;
  	/*
  	 * Find all commits that are reachable and are not marked as
  	 * SEEN.  Then make sure the trees and blobs contained are
  	 * complete.  After that, mark these commits also as SEEN.
  	 * If some of the objects that are needed to complete this
  	 * commit are missing, mark this commit as INCOMPLETE.
  	 */
  	memset(&study, 0, sizeof(study));
  	memset(&found, 0, sizeof(found));
  	add_object_array(&commit->object, NULL, &study);
  	add_object_array(&commit->object, NULL, &found);
  	commit->object.flags |= STUDYING;
  	while (study.nr) {
  		struct commit *c;
  		struct commit_list *parent;
  
  		c = (struct commit *)study.objects[--study.nr].item;
  		if (!c->object.parsed && !parse_object(&c->object.oid))
  			c->object.flags |= INCOMPLETE;
  
  		if (c->object.flags & INCOMPLETE) {
  			is_incomplete = 1;
  			break;
  		}
  		else if (c->object.flags & SEEN)
  			continue;
  		for (parent = c->parents; parent; parent = parent->next) {
  			struct commit *p = parent->item;
  			if (p->object.flags & STUDYING)
  				continue;
  			p->object.flags |= STUDYING;
  			add_object_array(&p->object, NULL, &study);
  			add_object_array(&p->object, NULL, &found);
  		}
  	}
  	if (!is_incomplete) {
  		/*
  		 * make sure all commits in "found" array have all the
  		 * necessary objects.
  		 */
  		for (i = 0; i < found.nr; i++) {
  			struct commit *c =
  				(struct commit *)found.objects[i].item;
  			if (!tree_is_complete(&c->tree->object.oid)) {
  				is_incomplete = 1;
  				c->object.flags |= INCOMPLETE;
  			}
  		}
  		if (!is_incomplete) {
  			/* mark all found commits as complete, iow SEEN */
  			for (i = 0; i < found.nr; i++)
  				found.objects[i].item->flags |= SEEN;
  		}
  	}
  	/* clear flags from the objects we traversed */
  	for (i = 0; i < found.nr; i++)
  		found.objects[i].item->flags &= ~STUDYING;
  	if (is_incomplete)
  		commit->object.flags |= INCOMPLETE;
  	else {
  		/*
  		 * If we come here, we have (1) traversed the ancestry chain
  		 * from the "commit" until we reach SEEN commits (which are
  		 * known to be complete), and (2) made sure that the commits
  		 * encountered during the above traversal refer to trees that
  		 * are complete.  Which means that we know *all* the commits
  		 * we have seen during this process are complete.
  		 */
  		for (i = 0; i < found.nr; i++)
  			found.objects[i].item->flags |= SEEN;
  	}
  	/* free object arrays */
  	free(study.objects);
  	free(found.objects);
  	return !is_incomplete;
  }
  
  static int keep_entry(struct commit **it, struct object_id *oid)
  {
  	struct commit *commit;
  
  	if (is_null_oid(oid))
  		return 1;
  	commit = lookup_commit_reference_gently(oid, 1);
  	if (!commit)
  		return 0;
  
  	/*
  	 * Make sure everything in this commit exists.
  	 *
  	 * We have walked all the objects reachable from the refs
  	 * and cache earlier.  The commits reachable by this commit
  	 * must meet SEEN commits -- and then we should mark them as
  	 * SEEN as well.
  	 */
  	if (!commit_is_complete(commit))
  		return 0;
  	*it = commit;
  	return 1;
  }
  
  /*
   * Starting from commits in the cb->mark_list, mark commits that are
   * reachable from them.  Stop the traversal at commits older than
   * the expire_limit and queue them back, so that the caller can call
   * us again to restart the traversal with longer expire_limit.
   */
  static void mark_reachable(struct expire_reflog_policy_cb *cb)
  {
  	struct commit_list *pending;
  	timestamp_t expire_limit = cb->mark_limit;
  	struct commit_list *leftover = NULL;
  
  	for (pending = cb->mark_list; pending; pending = pending->next)
  		pending->item->object.flags &= ~REACHABLE;
  
  	pending = cb->mark_list;
  	while (pending) {
  		struct commit_list *parent;
  		struct commit *commit = pop_commit(&pending);
  		if (commit->object.flags & REACHABLE)
  			continue;
  		if (parse_commit(commit))
  			continue;
  		commit->object.flags |= REACHABLE;
  		if (commit->date < expire_limit) {
  			commit_list_insert(commit, &leftover);
  			continue;
  		}
  		commit->object.flags |= REACHABLE;
  		parent = commit->parents;
  		while (parent) {
  			commit = parent->item;
  			parent = parent->next;
  			if (commit->object.flags & REACHABLE)
  				continue;
  			commit_list_insert(commit, &pending);
  		}
  	}
  	cb->mark_list = leftover;
  }
  
  static int unreachable(struct expire_reflog_policy_cb *cb, struct commit *commit, struct object_id *oid)
  {
  	/*
  	 * We may or may not have the commit yet - if not, look it
  	 * up using the supplied sha1.
  	 */
  	if (!commit) {
  		if (is_null_oid(oid))
  			return 0;
  
  		commit = lookup_commit_reference_gently(oid, 1);
  
  		/* Not a commit -- keep it */
  		if (!commit)
  			return 0;
  	}
  
  	/* Reachable from the current ref?  Don't prune. */
  	if (commit->object.flags & REACHABLE)
  		return 0;
  
  	if (cb->mark_list && cb->mark_limit) {
  		cb->mark_limit = 0; /* dig down to the root */
  		mark_reachable(cb);
  	}
  
  	return !(commit->object.flags & REACHABLE);
  }
  
  /*
   * Return true iff the specified reflog entry should be expired.
   */
  static int should_expire_reflog_ent(struct object_id *ooid, struct object_id *noid,
  				    const char *email, timestamp_t timestamp, int tz,
  				    const char *message, void *cb_data)
  {
  	struct expire_reflog_policy_cb *cb = cb_data;
  	struct commit *old, *new;
  
  	if (timestamp < cb->cmd.expire_total)
  		return 1;
  
  	old = new = NULL;
  	if (cb->cmd.stalefix &&
  	    (!keep_entry(&old, ooid) || !keep_entry(&new, noid)))
  		return 1;
  
  	if (timestamp < cb->cmd.expire_unreachable) {
  		if (cb->unreachable_expire_kind == UE_ALWAYS)
  			return 1;
  		if (unreachable(cb, old, ooid) || unreachable(cb, new, noid))
  			return 1;
  	}
  
  	if (cb->cmd.recno && --(cb->cmd.recno) == 0)
  		return 1;
  
  	return 0;
  }
  
  static int push_tip_to_list(const char *refname, const struct object_id *oid,
  			    int flags, void *cb_data)
  {
  	struct commit_list **list = cb_data;
  	struct commit *tip_commit;
  	if (flags & REF_ISSYMREF)
  		return 0;
  	tip_commit = lookup_commit_reference_gently(oid, 1);
  	if (!tip_commit)
  		return 0;
  	commit_list_insert(tip_commit, list);
  	return 0;
  }
  
  static void reflog_expiry_prepare(const char *refname,
  				  const struct object_id *oid,
  				  void *cb_data)
  {
  	struct expire_reflog_policy_cb *cb = cb_data;
  
  	if (!cb->cmd.expire_unreachable || !strcmp(refname, "HEAD")) {
  		cb->tip_commit = NULL;
  		cb->unreachable_expire_kind = UE_HEAD;
  	} else {
  		cb->tip_commit = lookup_commit_reference_gently(oid, 1);
  		if (!cb->tip_commit)
  			cb->unreachable_expire_kind = UE_ALWAYS;
  		else
  			cb->unreachable_expire_kind = UE_NORMAL;
  	}
  
  	if (cb->cmd.expire_unreachable <= cb->cmd.expire_total)
  		cb->unreachable_expire_kind = UE_ALWAYS;
  
  	cb->mark_list = NULL;
  	cb->tips = NULL;
  	if (cb->unreachable_expire_kind != UE_ALWAYS) {
  		if (cb->unreachable_expire_kind == UE_HEAD) {
  			struct commit_list *elem;
  
  			for_each_ref(push_tip_to_list, &cb->tips);
  			for (elem = cb->tips; elem; elem = elem->next)
  				commit_list_insert(elem->item, &cb->mark_list);
  		} else {
  			commit_list_insert(cb->tip_commit, &cb->mark_list);
  		}
  		cb->mark_limit = cb->cmd.expire_total;
  		mark_reachable(cb);
  	}
  }
  
  static void reflog_expiry_cleanup(void *cb_data)
  {
  	struct expire_reflog_policy_cb *cb = cb_data;
  
  	if (cb->unreachable_expire_kind != UE_ALWAYS) {
  		if (cb->unreachable_expire_kind == UE_HEAD) {
  			struct commit_list *elem;
  			for (elem = cb->tips; elem; elem = elem->next)
  				clear_commit_marks(elem->item, REACHABLE);
  			free_commit_list(cb->tips);
  		} else {
  			clear_commit_marks(cb->tip_commit, REACHABLE);
  		}
  	}
  }
  
  static int collect_reflog(const char *ref, const struct object_id *oid, int unused, void *cb_data)
  {
  	struct collected_reflog *e;
  	struct collect_reflog_cb *cb = cb_data;
  
  	FLEX_ALLOC_STR(e, reflog, ref);
  	hashcpy(e->sha1, oid->hash);
  	ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc);
  	cb->e[cb->nr++] = e;
  	return 0;
  }
  
  static struct reflog_expire_cfg {
  	struct reflog_expire_cfg *next;
  	timestamp_t expire_total;
  	timestamp_t expire_unreachable;
  	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 (!strncmp(ent->pattern, pattern, len) &&
  		    ent->pattern[len] == '\0')
  			return ent;
  
  	FLEX_ALLOC_MEM(ent, pattern, pattern, 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, timestamp_t *expire)
  {
  	if (!value)
  		return config_error_nonbool(var);
  	if (parse_expiry_date(value, expire))
  		return error(_("'%s' for '%s' is not a valid timestamp"),
  			     value, var);
  	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 *pattern, *key;
  	int pattern_len;
  	timestamp_t expire;
  	int slot;
  	struct reflog_expire_cfg *ent;
  
  	if (parse_config_key(var, "gc", &pattern, &pattern_len, &key) < 0)
  		return git_default_config(var, value, cb);
  
  	if (!strcmp(key, "reflogexpire")) {
  		slot = EXPIRE_TOTAL;
  		if (parse_expire_cfg_value(var, value, &expire))
  			return -1;
  	} else if (!strcmp(key, "reflogexpireunreachable")) {
  		slot = EXPIRE_UNREACH;
  		if (parse_expire_cfg_value(var, value, &expire))
  			return -1;
  	} else
  		return git_default_config(var, value, cb);
  
  	if (!pattern) {
  		switch (slot) {
  		case EXPIRE_TOTAL:
  			default_reflog_expire = expire;
  			break;
  		case EXPIRE_UNREACH:
  			default_reflog_expire_unreachable = expire;
  			break;
  		}
  		return 0;
  	}
  
  	ent = find_cfg_ent(pattern, pattern_len);
  	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 (!wildmatch(ent->pattern, ref, 0, NULL)) {
  			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)
  {
  	struct expire_reflog_policy_cb cb;
  	timestamp_t now = time(NULL);
  	int i, status, do_all;
  	int explicit_expiry = 0;
  	unsigned int flags = 0;
  
  	default_reflog_expire_unreachable = now - 30 * 24 * 3600;
  	default_reflog_expire = now - 90 * 24 * 3600;
  	git_config(reflog_expire_config, NULL);
  
  	save_commit_buffer = 0;
  	do_all = status = 0;
  	memset(&cb, 0, sizeof(cb));
  
  	cb.cmd.expire_total = default_reflog_expire;
  	cb.cmd.expire_unreachable = default_reflog_expire_unreachable;
  
  	for (i = 1; i < argc; i++) {
  		const char *arg = argv[i];
  		if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
  			flags |= EXPIRE_REFLOGS_DRY_RUN;
  		else if (starts_with(arg, "--expire=")) {
  			if (parse_expiry_date(arg + 9, &cb.cmd.expire_total))
  				die(_("'%s' is not a valid timestamp"), arg);
  			explicit_expiry |= EXPIRE_TOTAL;
  		}
  		else if (starts_with(arg, "--expire-unreachable=")) {
  			if (parse_expiry_date(arg + 21, &cb.cmd.expire_unreachable))
  				die(_("'%s' is not a valid timestamp"), arg);
  			explicit_expiry |= EXPIRE_UNREACH;
  		}
  		else if (!strcmp(arg, "--stale-fix"))
  			cb.cmd.stalefix = 1;
  		else if (!strcmp(arg, "--rewrite"))
  			flags |= EXPIRE_REFLOGS_REWRITE;
  		else if (!strcmp(arg, "--updateref"))
  			flags |= EXPIRE_REFLOGS_UPDATE_REF;
  		else if (!strcmp(arg, "--all"))
  			do_all = 1;
  		else if (!strcmp(arg, "--verbose"))
  			flags |= EXPIRE_REFLOGS_VERBOSE;
  		else if (!strcmp(arg, "--")) {
  			i++;
  			break;
  		}
  		else if (arg[0] == '-')
  			usage(reflog_expire_usage);
  		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.cmd.stalefix) {
  		init_revisions(&cb.cmd.revs, prefix);
  		if (flags & EXPIRE_REFLOGS_VERBOSE)
  			printf("Marking reachable objects...");
  		mark_reachable_objects(&cb.cmd.revs, 0, 0, NULL);
  		if (flags & EXPIRE_REFLOGS_VERBOSE)
  			putchar('\n');
  	}
  
  	if (do_all) {
  		struct collect_reflog_cb collected;
  		int i;
  
  		memset(&collected, 0, sizeof(collected));
  		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.cmd, explicit_expiry, e->reflog);
  			status |= reflog_expire(e->reflog, e->sha1, flags,
  						reflog_expiry_prepare,
  						should_expire_reflog_ent,
  						reflog_expiry_cleanup,
  						&cb);
  			free(e);
  		}
  		free(collected.e);
  	}
  
  	for (; i < argc; i++) {
  		char *ref;
  		unsigned char sha1[20];
  		if (!dwim_log(argv[i], strlen(argv[i]), sha1, &ref)) {
  			status |= error("%s points nowhere!", argv[i]);
  			continue;
  		}
  		set_reflog_expiry_param(&cb.cmd, explicit_expiry, ref);
  		status |= reflog_expire(ref, sha1, flags,
  					reflog_expiry_prepare,
  					should_expire_reflog_ent,
  					reflog_expiry_cleanup,
  					&cb);
  	}
  	return status;
  }
  
  static int count_reflog_ent(struct object_id *ooid, struct object_id *noid,
  		const char *email, timestamp_t timestamp, int tz,
  		const char *message, void *cb_data)
  {
  	struct expire_reflog_policy_cb *cb = cb_data;
  	if (!cb->cmd.expire_total || timestamp < cb->cmd.expire_total)
  		cb->cmd.recno++;
  	return 0;
  }
  
  static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
  {
  	struct expire_reflog_policy_cb cb;
  	int i, status = 0;
  	unsigned int flags = 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"))
  			flags |= EXPIRE_REFLOGS_DRY_RUN;
  		else if (!strcmp(arg, "--rewrite"))
  			flags |= EXPIRE_REFLOGS_REWRITE;
  		else if (!strcmp(arg, "--updateref"))
  			flags |= EXPIRE_REFLOGS_UPDATE_REF;
  		else if (!strcmp(arg, "--verbose"))
  			flags |= EXPIRE_REFLOGS_VERBOSE;
  		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.cmd.recno = -recno;
  			for_each_reflog_ent(ref, count_reflog_ent, &cb);
  		} else {
  			cb.cmd.expire_total = approxidate(spec + 2);
  			for_each_reflog_ent(ref, count_reflog_ent, &cb);
  			cb.cmd.expire_total = 0;
  		}
  
  		status |= reflog_expire(ref, sha1, flags,
  					reflog_expiry_prepare,
  					should_expire_reflog_ent,
  					reflog_expiry_cleanup,
  					&cb);
  		free(ref);
  	}
  	return status;
  }
  
  static int cmd_reflog_exists(int argc, const char **argv, const char *prefix)
  {
  	int i, start = 0;
  
  	for (i = 1; i < argc; i++) {
  		const char *arg = argv[i];
  		if (!strcmp(arg, "--")) {
  			i++;
  			break;
  		}
  		else if (arg[0] == '-')
  			usage(reflog_exists_usage);
  		else
  			break;
  	}
  
  	start = i;
  
  	if (argc - start != 1)
  		usage(reflog_exists_usage);
  
  	if (check_refname_format(argv[start], REFNAME_ALLOW_ONELEVEL))
  		die("invalid ref format: %s", argv[start]);
  	return !reflog_exists(argv[start]);
  }
  
  /*
   * main "reflog"
   */
  
  static const char reflog_usage[] =
  "git reflog [ show | expire | delete | exists ]";
  
  int cmd_reflog(int argc, const char **argv, const char *prefix)
  {
  	if (argc > 1 && !strcmp(argv[1], "-h"))
  		usage(reflog_usage);
  
  	/* With no command, we default to showing it. */
  	if (argc < 2 || *argv[1] == '-')
  		return cmd_log_reflog(argc, argv, prefix);
  
  	if (!strcmp(argv[1], "show"))
  		return cmd_log_reflog(argc - 1, argv + 1, 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);
  
  	if (!strcmp(argv[1], "exists"))
  		return cmd_reflog_exists(argc - 1, argv + 1, prefix);
  
  	return cmd_log_reflog(argc, argv, prefix);
  }
  