X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=builtin-reflog.c;h=cefb40da812819ed6c8af245f676b0365e23d3ea;hb=d81bf827192f0af6b1cca64d2cdbaac9b5ca2020;hp=4097c328ccdfc8c377ccf9c23a4330fe2020c5c8;hpb=8d8b9f6252271899708b32fbce4cd2541af9545a;p=git.git

diff --git a/builtin-reflog.c b/builtin-reflog.c
index 4097c328c..cefb40da8 100644
--- a/builtin-reflog.c
+++ b/builtin-reflog.c
@@ -4,121 +4,256 @@
 #include "refs.h"
 #include "dir.h"
 #include "tree-walk.h"
+#include "diff.h"
+#include "revision.h"
+#include "reachable.h"
+
+/*
+ * reflog expire
+ */
+
+static const char reflog_expire_usage[] =
+"git-reflog (show|expire) [--verbose] [--dry-run] [--stale-fix] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";
+
+static unsigned long default_reflog_expire;
+static unsigned long default_reflog_expire_unreachable;
+
+struct cmd_reflog_expire_cb {
+	struct rev_info revs;
+	int dry_run;
+	int stalefix;
+	int verbose;
+	unsigned long expire_total;
+	unsigned long expire_unreachable;
+};
 
 struct expire_reflog_cb {
 	FILE *newlog;
 	const char *ref;
 	struct commit *ref_commit;
-	unsigned long expire_total;
-	unsigned long expire_unreachable;
+	struct cmd_reflog_expire_cb *cmd;
 };
 
+#define INCOMPLETE	(1u<<10)
+#define STUDYING	(1u<<11)
+
 static int tree_is_complete(const unsigned char *sha1)
 {
 	struct tree_desc desc;
-	void *buf;
-	char type[20];
+	struct name_entry entry;
+	int complete;
+	struct tree *tree;
 
-	buf = read_sha1_file(sha1, type, &desc.size);
-	if (!buf)
+	tree = lookup_tree(sha1);
+	if (!tree)
 		return 0;
-	desc.buf = buf;
-	while (desc.size) {
-		const unsigned char *elem;
-		const char *name;
-		unsigned mode;
-
-		elem = tree_entry_extract(&desc, &name, &mode);
-		if (!has_sha1_file(elem) ||
-		    (S_ISDIR(mode) && !tree_is_complete(elem))) {
-			free(buf);
+	if (tree->object.flags & SEEN)
+		return 1;
+	if (tree->object.flags & INCOMPLETE)
+		return 0;
+
+	desc.buf = tree->buffer;
+	desc.size = tree->size;
+	if (!desc.buf) {
+		char type[20];
+		void *data = read_sha1_file(sha1, type, &desc.size);
+		if (!data) {
+			tree->object.flags |= INCOMPLETE;
 			return 0;
 		}
-		update_tree_entry(&desc);
+		desc.buf = data;
+		tree->buffer = data;
 	}
-	free(buf);
-	return 1;
+	complete = 1;
+	while (tree_entry(&desc, &entry)) {
+		if (!has_sha1_file(entry.sha1) ||
+		    (S_ISDIR(entry.mode) && !tree_is_complete(entry.sha1))) {
+			tree->object.flags |= INCOMPLETE;
+			complete = 0;
+		}
+	}
+	free(tree->buffer);
+	tree->buffer = NULL;
+
+	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.sha1))
+			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.sha1)) {
+				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, unsigned char *sha1)
 {
 	struct commit *commit;
 
-	*it = NULL;
 	if (is_null_sha1(sha1))
 		return 1;
 	commit = lookup_commit_reference_gently(sha1, 1);
 	if (!commit)
 		return 0;
 
-	/* Make sure everything in this commit exists. */
-	parse_object(commit->object.sha1);
-	if (!tree_is_complete(commit->tree->object.sha1))
+	/*
+	 * 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;
 }
 
 static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
-			     char *data, void *cb_data)
+		const char *email, unsigned long timestamp, int tz,
+		const char *message, void *cb_data)
 {
 	struct expire_reflog_cb *cb = cb_data;
-	unsigned long timestamp;
-	char *cp, *ep;
 	struct commit *old, *new;
 
-	cp = strchr(data, '>');
-	if (!cp || *++cp != ' ')
-		goto prune;
-	timestamp = strtoul(cp, &ep, 10);
-	if (*ep != ' ')
-		goto prune;
-	if (timestamp < cb->expire_total)
+	if (timestamp < cb->cmd->expire_total)
 		goto prune;
 
-	if (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1))
+	old = new = NULL;
+	if (cb->cmd->stalefix &&
+	    (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1)))
 		goto prune;
 
-	if ((timestamp < cb->expire_unreachable) &&
-	    ((old && !in_merge_bases(old, cb->ref_commit)) ||
-	     (new && !in_merge_bases(new, cb->ref_commit))))
-		goto prune;
+	if (timestamp < cb->cmd->expire_unreachable) {
+		if (!cb->ref_commit)
+			goto prune;
+		if (!old && !is_null_sha1(osha1))
+			old = lookup_commit_reference_gently(osha1, 1);
+		if (!new && !is_null_sha1(nsha1))
+			new = lookup_commit_reference_gently(nsha1, 1);
+		if ((old && !in_merge_bases(old, &cb->ref_commit, 1)) ||
+		    (new && !in_merge_bases(new, &cb->ref_commit, 1)))
+			goto prune;
+	}
 
-	if (cb->newlog)
-		fprintf(cb->newlog, "%s %s %s",
-			sha1_to_hex(osha1), sha1_to_hex(nsha1), data);
+	if (cb->newlog) {
+		char sign = (tz < 0) ? '-' : '+';
+		int zone = (tz < 0) ? (-tz) : tz;
+		fprintf(cb->newlog, "%s %s %s %lu %c%04d\t%s",
+			sha1_to_hex(osha1), sha1_to_hex(nsha1),
+			email, timestamp, sign, zone,
+			message);
+	}
+	if (cb->cmd->verbose)
+		printf("keep %s", message);
 	return 0;
  prune:
-	if (!cb->newlog)
-		fprintf(stderr, "would prune %s", data);
+	if (!cb->newlog || cb->cmd->verbose)
+		printf("%sprune %s", cb->newlog ? "" : "would ", message);
 	return 0;
 }
 
-struct cmd_reflog_expire_cb {
-	int dry_run;
-	unsigned long expire_total;
-	unsigned long expire_unreachable;
-};
-
 static int expire_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
 {
 	struct cmd_reflog_expire_cb *cmd = cb_data;
 	struct expire_reflog_cb cb;
 	struct ref_lock *lock;
-	char *newlog_path = NULL;
+	char *log_file, *newlog_path = NULL;
 	int status = 0;
 
-	if (strncmp(ref, "refs/", 5))
-		return error("not a ref '%s'", ref);
-
 	memset(&cb, 0, sizeof(cb));
 	/* we take the lock for the ref itself to prevent it from
 	 * getting updated.
 	 */
-	lock = lock_ref_sha1(ref + 5, sha1);
+	lock = lock_any_ref_for_update(ref, sha1);
 	if (!lock)
 		return error("cannot lock ref '%s'", ref);
-	if (!file_exists(lock->log_file))
+	log_file = xstrdup(git_path("logs/%s", ref));
+	if (!file_exists(log_file))
 		goto finish;
 	if (!cmd->dry_run) {
 		newlog_path = xstrdup(git_path("logs/%s.lock", ref));
@@ -126,32 +261,36 @@ static int expire_reflog(const char *ref, const unsigned char *sha1, int unused,
 	}
 
 	cb.ref_commit = lookup_commit_reference_gently(sha1, 1);
-	if (!cb.ref_commit) {
-		status = error("ref '%s' does not point at a commit", ref);
-		goto finish;
-	}
 	cb.ref = ref;
-	cb.expire_total = cmd->expire_total;
-	cb.expire_unreachable = cmd->expire_unreachable;
+	cb.cmd = cmd;
 	for_each_reflog_ent(ref, expire_reflog_ent, &cb);
  finish:
 	if (cb.newlog) {
 		if (fclose(cb.newlog))
 			status |= error("%s: %s", strerror(errno),
 					newlog_path);
-		if (rename(newlog_path, lock->log_file)) {
+		if (rename(newlog_path, log_file)) {
 			status |= error("cannot rename %s to %s",
-					newlog_path, lock->log_file);
+					newlog_path, log_file);
 			unlink(newlog_path);
 		}
 	}
 	free(newlog_path);
+	free(log_file);
 	unlock_ref(lock);
 	return status;
 }
 
-static const char reflog_expire_usage[] =
-"git-reflog expire [--dry-run] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";
+static int reflog_expire_config(const char *var, const char *value)
+{
+	if (!strcmp(var, "gc.reflogexpire"))
+		default_reflog_expire = approxidate(value);
+	else if (!strcmp(var, "gc.reflogexpireunreachable"))
+		default_reflog_expire_unreachable = approxidate(value);
+	else
+		return git_default_config(var, value);
+	return 0;
+}
 
 static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 {
@@ -159,22 +298,39 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 	unsigned long now = time(NULL);
 	int i, status, do_all;
 
+	git_config(reflog_expire_config);
+
 	save_commit_buffer = 0;
 	do_all = status = 0;
 	memset(&cb, 0, sizeof(cb));
-	cb.expire_total = now - 90 * 24 * 3600;
-	cb.expire_unreachable = now - 30 * 24 * 3600;
+
+	if (!default_reflog_expire_unreachable)
+		default_reflog_expire_unreachable = now - 30 * 24 * 3600;
+	if (!default_reflog_expire)
+		default_reflog_expire = now - 90 * 24 * 3600;
+	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 (!strncmp(arg, "--expire=", 9))
+		else if (!prefixcmp(arg, "--expire="))
 			cb.expire_total = approxidate(arg + 9);
-		else if (!strncmp(arg, "--expire-unreachable=", 21))
+		else if (!prefixcmp(arg, "--expire-unreachable="))
 			cb.expire_unreachable = approxidate(arg + 21);
+		else if (!strcmp(arg, "--stale-fix"))
+			cb.stalefix = 1;
 		else if (!strcmp(arg, "--all"))
 			do_all = 1;
+		else if (!strcmp(arg, "--verbose"))
+			cb.verbose = 1;
 		else if (!strcmp(arg, "--")) {
 			i++;
 			break;
@@ -184,8 +340,17 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 		else
 			break;
 	}
+	if (cb.stalefix) {
+		init_revisions(&cb.revs, prefix);
+		if (cb.verbose)
+			printf("Marking reachable objects...");
+		mark_reachable_objects(&cb.revs, 0);
+		if (cb.verbose)
+			putchar('\n');
+	}
+
 	if (do_all)
-		status |= for_each_ref(expire_reflog, &cb);
+		status |= for_each_reflog(expire_reflog, &cb);
 	while (i < argc) {
 		const char *ref = argv[i++];
 		unsigned char sha1[20];
@@ -198,15 +363,25 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 	return status;
 }
 
+/*
+ * main "reflog"
+ */
+
 static const char reflog_usage[] =
 "git-reflog (expire | ...)";
 
 int cmd_reflog(int argc, const char **argv, const char *prefix)
 {
-	if (argc < 2)
-		usage(reflog_usage);
-	else if (!strcmp(argv[1], "expire"))
+	/* 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);
-	else
-		usage(reflog_usage);
+
+	/* Not a recognized reflog command..*/
+	usage(reflog_usage);
 }