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#include "cache.h"
#include "builtin.h"
#include "commit.h"
#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 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;
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;
struct name_entry entry;
int complete;
struct tree *tree;
tree = lookup_tree(sha1);
if (!tree)
return 0;
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;
}
desc.buf = data;
tree->buffer = data;
}
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;
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.
*
* 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,
const char *email, unsigned long timestamp, int tz,
const char *message, void *cb_data)
{
struct expire_reflog_cb *cb = cb_data;
struct commit *old, *new;
if (timestamp < cb->cmd->expire_total)
goto prune;
old = new = NULL;
if (cb->cmd->stalefix &&
(!keep_entry(&old, osha1) || !keep_entry(&new, nsha1)))
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)) ||
(new && !in_merge_bases(new, cb->ref_commit)))
goto prune;
}
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 || cb->cmd->verbose)
printf("%sprune %s", cb->newlog ? "" : "would ", message);
return 0;
}
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 *log_file, *newlog_path = NULL;
int status = 0;
memset(&cb, 0, sizeof(cb));
/* we take the lock for the ref itself to prevent it from
* getting updated.
*/
lock = lock_any_ref_for_update(ref, sha1);
if (!lock)
return error("cannot lock ref '%s'", ref);
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));
cb.newlog = fopen(newlog_path, "w");
}
cb.ref_commit = lookup_commit_reference_gently(sha1, 1);
cb.ref = ref;
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, log_file)) {
status |= error("cannot rename %s to %s",
newlog_path, log_file);
unlink(newlog_path);
}
}
free(newlog_path);
free(log_file);
unlock_ref(lock);
return status;
}
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)
{
struct cmd_reflog_expire_cb cb;
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));
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))
cb.expire_total = approxidate(arg + 9);
else if (!strncmp(arg, "--expire-unreachable=", 21))
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;
}
else if (arg[0] == '-')
usage(reflog_expire_usage);
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_reflog(expire_reflog, &cb);
while (i < argc) {
const char *ref = argv[i++];
unsigned char sha1[20];
if (!resolve_ref(ref, sha1, 1, NULL)) {
status |= error("%s points nowhere!", ref);
continue;
}
status |= expire_reflog(ref, sha1, 0, &cb);
}
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"))
return cmd_reflog_expire(argc - 1, argv + 1, prefix);
else
usage(reflog_usage);
}
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