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git/builtin/reflog.c

845 lines
22 KiB

#include "builtin.h"
#include "config.h"
#include "lockfile.h"
#include "object-store.h"
#include "repository.h"
#include "commit.h"
#include "refs.h"
#include "dir.h"
#include "tree-walk.h"
#include "diff.h"
#include "revision.h"
#include "reachable.h"
#include "worktree.h"
static const char reflog_exists_usage[] =
N_("git reflog exists <ref>");
static timestamp_t default_reflog_expire;
static timestamp_t default_reflog_expire_unreachable;
struct cmd_reflog_expire_cb {
int stalefix;
int explicit_expiry;
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;
unsigned int dry_run:1;
};
struct worktree_reflogs {
struct worktree *worktree;
struct string_list reflogs;
};
/* Remember to update object flag allocation in object.h */
#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(the_repository, 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_object_file(oid, &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_object_file(&entry.oid) ||
(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 *)object_array_pop(&study);
if (!c->object.parsed && !parse_object(the_repository, &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(get_commit_tree_oid(c))) {
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 */
object_array_clear(&study);
object_array_clear(&found);
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(the_repository, 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(the_repository, 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_commit, *new_commit;
if (timestamp < cb->cmd.expire_total)
return 1;
old_commit = new_commit = NULL;
if (cb->cmd.stalefix &&
(!keep_entry(&old_commit, ooid) || !keep_entry(&new_commit, noid)))
return 1;
if (timestamp < cb->cmd.expire_unreachable) {
switch (cb->unreachable_expire_kind) {
case UE_ALWAYS:
return 1;
case UE_NORMAL:
case UE_HEAD:
if (unreachable(cb, old_commit, ooid) || unreachable(cb, new_commit, noid))
return 1;
break;
}
}
if (cb->cmd.recno && --(cb->cmd.recno) == 0)
return 1;
return 0;
}
static int should_expire_reflog_ent_verbose(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;
int expire;
expire = should_expire_reflog_ent(ooid, noid, email, timestamp, tz,
message, cb);
if (!expire)
printf("keep %s", message);
else if (cb->dry_run)
printf("would prune %s", message);
else
printf("prune %s", message);
return expire;
}
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(the_repository, oid, 1);
if (!tip_commit)
return 0;
commit_list_insert(tip_commit, list);
return 0;
}
static int is_head(const char *refname)
{
switch (ref_type(refname)) {
case REF_TYPE_OTHER_PSEUDOREF:
case REF_TYPE_MAIN_PSEUDOREF:
if (parse_worktree_ref(refname, NULL, NULL, &refname))
BUG("not a worktree ref: %s", refname);
break;
default:
break;
}
return !strcmp(refname, "HEAD");
}
static void reflog_expiry_prepare(const char *refname,
const struct object_id *oid,
void *cb_data)
{
struct expire_reflog_policy_cb *cb = cb_data;
struct commit_list *elem;
struct commit *commit = NULL;
if (!cb->cmd.expire_unreachable || is_head(refname)) {
cb->unreachable_expire_kind = UE_HEAD;
} else {
commit = lookup_commit(the_repository, oid);
cb->unreachable_expire_kind = commit ? UE_NORMAL : UE_ALWAYS;
}
if (cb->cmd.expire_unreachable <= cb->cmd.expire_total)
cb->unreachable_expire_kind = UE_ALWAYS;
switch (cb->unreachable_expire_kind) {
case UE_ALWAYS:
return;
case UE_HEAD:
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);
break;
case UE_NORMAL:
commit_list_insert(commit, &cb->mark_list);
/* For reflog_expiry_cleanup() below */
cb->tip_commit = commit;
}
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;
struct commit_list *elem;
switch (cb->unreachable_expire_kind) {
case UE_ALWAYS:
return;
case UE_HEAD:
for (elem = cb->tips; elem; elem = elem->next)
clear_commit_marks(elem->item, REACHABLE);
free_commit_list(cb->tips);
break;
case UE_NORMAL:
clear_commit_marks(cb->tip_commit, REACHABLE);
break;
}
}
static int collect_reflog(const char *ref, const struct object_id *oid, int unused, void *cb_data)
{
struct worktree_reflogs *cb = cb_data;
struct worktree *worktree = cb->worktree;
struct strbuf newref = STRBUF_INIT;
/*
* Avoid collecting the same shared ref multiple times because
* they are available via all worktrees.
*/
if (!worktree->is_current && ref_type(ref) == REF_TYPE_NORMAL)
return 0;
strbuf_worktree_ref(worktree, &newref, ref);
string_list_append_nodup(&cb->reflogs, strbuf_detach(&newref, NULL));
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;
}
/* 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;
size_t 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 (git_config_expiry_date(&expire, var, value))
return -1;
} else if (!strcmp(key, "reflogexpireunreachable")) {
slot = EXPIRE_UNREACH;
if (git_config_expiry_date(&expire, var, value))
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, const char *ref)
{
struct reflog_expire_cfg *ent;
if (cb->explicit_expiry == (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)) {
if (!(cb->explicit_expiry & EXPIRE_TOTAL))
cb->expire_total = ent->expire_total;
if (!(cb->explicit_expiry & EXPIRE_UNREACH))
cb->expire_unreachable = ent->expire_unreachable;
return;
}
}
/*
* If unconfigured, make stash never expire
*/
if (!strcmp(ref, "refs/stash")) {
if (!(cb->explicit_expiry & EXPIRE_TOTAL))
cb->expire_total = 0;
if (!(cb->explicit_expiry & EXPIRE_UNREACH))
cb->expire_unreachable = 0;
return;
}
/* Nothing matched -- use the default value */
if (!(cb->explicit_expiry & EXPIRE_TOTAL))
cb->expire_total = default_reflog_expire;
if (!(cb->explicit_expiry & EXPIRE_UNREACH))
cb->expire_unreachable = default_reflog_expire_unreachable;
}
static const char * reflog_expire_usage[] = {
N_("git reflog expire [--expire=<time>] "
"[--expire-unreachable=<time>] "
"[--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] "
"[--verbose] [--all] <refs>..."),
NULL
};
static int expire_unreachable_callback(const struct option *opt,
const char *arg,
int unset)
{
struct cmd_reflog_expire_cb *cmd = opt->value;
if (parse_expiry_date(arg, &cmd->expire_unreachable))
die(_("invalid timestamp '%s' given to '--%s'"),
arg, opt->long_name);
cmd->explicit_expiry |= EXPIRE_UNREACH;
return 0;
}
static int expire_total_callback(const struct option *opt,
const char *arg,
int unset)
{
struct cmd_reflog_expire_cb *cmd = opt->value;
if (parse_expiry_date(arg, &cmd->expire_total))
die(_("invalid timestamp '%s' given to '--%s'"),
arg, opt->long_name);
cmd->explicit_expiry |= EXPIRE_TOTAL;
return 0;
}
static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
{
struct cmd_reflog_expire_cb cmd = { 0 };
timestamp_t now = time(NULL);
int i, status, do_all, all_worktrees = 1;
unsigned int flags = 0;
int verbose = 0;
reflog_expiry_should_prune_fn *should_prune_fn = should_expire_reflog_ent;
const struct option options[] = {
OPT_BIT(0, "dry-run", &flags, N_("do not actually prune any entries"),
EXPIRE_REFLOGS_DRY_RUN),
OPT_BIT(0, "rewrite", &flags,
N_("rewrite the old SHA1 with the new SHA1 of the entry that now precedes it"),
EXPIRE_REFLOGS_REWRITE),
OPT_BIT(0, "updateref", &flags,
N_("update the reference to the value of the top reflog entry"),
EXPIRE_REFLOGS_UPDATE_REF),
OPT_BOOL(0, "verbose", &verbose, N_("print extra information on screen.")),
OPT_CALLBACK_F(0, "expire", &cmd, N_("timestamp"),
N_("prune entries older than the specified time"),
PARSE_OPT_NONEG,
expire_total_callback),
OPT_CALLBACK_F(0, "expire-unreachable", &cmd, N_("timestamp"),
N_("prune entries older than <time> that are not reachable from the current tip of the branch"),
PARSE_OPT_NONEG,
expire_unreachable_callback),
OPT_BOOL(0, "stale-fix", &cmd.stalefix,
N_("prune any reflog entries that point to broken commits")),
OPT_BOOL(0, "all", &do_all, N_("process the reflogs of all references")),
OPT_BOOL(1, "single-worktree", &all_worktrees,
N_("limits processing to reflogs from the current worktree only.")),
OPT_END()
};
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;
cmd.explicit_expiry = 0;
cmd.expire_total = default_reflog_expire;
cmd.expire_unreachable = default_reflog_expire_unreachable;
argc = parse_options(argc, argv, prefix, options, reflog_expire_usage, 0);
if (verbose)
should_prune_fn = should_expire_reflog_ent_verbose;
/*
* 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 (cmd.stalefix) {
struct rev_info revs;
repo_init_revisions(the_repository, &revs, prefix);
revs.do_not_die_on_missing_tree = 1;
revs.ignore_missing = 1;
revs.ignore_missing_links = 1;
if (verbose)
printf(_("Marking reachable objects..."));
mark_reachable_objects(&revs, 0, 0, NULL);
if (verbose)
putchar('\n');
}
if (do_all) {
struct worktree_reflogs collected = {
.reflogs = STRING_LIST_INIT_DUP,
};
struct string_list_item *item;
struct worktree **worktrees, **p;
worktrees = get_worktrees();
for (p = worktrees; *p; p++) {
if (!all_worktrees && !(*p)->is_current)
continue;
collected.worktree = *p;
refs_for_each_reflog(get_worktree_ref_store(*p),
collect_reflog, &collected);
}
free_worktrees(worktrees);
for_each_string_list_item(item, &collected.reflogs) {
struct expire_reflog_policy_cb cb = {
.cmd = cmd,
.dry_run = !!(flags & EXPIRE_REFLOGS_DRY_RUN),
};
set_reflog_expiry_param(&cb.cmd, item->string);
status |= reflog_expire(item->string, flags,
reflog_expiry_prepare,
should_prune_fn,
reflog_expiry_cleanup,
&cb);
}
string_list_clear(&collected.reflogs, 0);
}
for (i = 0; i < argc; i++) {
char *ref;
struct expire_reflog_policy_cb cb = { .cmd = cmd };
if (!dwim_log(argv[i], strlen(argv[i]), NULL, &ref)) {
status |= error(_("%s points nowhere!"), argv[i]);
continue;
}
set_reflog_expiry_param(&cb.cmd, ref);
status |= reflog_expire(ref, flags,
reflog_expiry_prepare,
should_prune_fn,
reflog_expiry_cleanup,
&cb);
free(ref);
}
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 cmd_reflog_expire_cb *cb = cb_data;
if (!cb->expire_total || timestamp < cb->expire_total)
cb->recno++;
return 0;
}
static const char * reflog_delete_usage[] = {
N_("git reflog delete [--rewrite] [--updateref] "
"[--dry-run | -n] [--verbose] <refs>..."),
NULL
};
static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
{
struct cmd_reflog_expire_cb cmd = { 0 };
int i, status = 0;
unsigned int flags = 0;
int verbose = 0;
reflog_expiry_should_prune_fn *should_prune_fn = should_expire_reflog_ent;
const struct option options[] = {
OPT_BIT(0, "dry-run", &flags, N_("do not actually prune any entries"),
EXPIRE_REFLOGS_DRY_RUN),
OPT_BIT(0, "rewrite", &flags,
N_("rewrite the old SHA1 with the new SHA1 of the entry that now precedes it"),
EXPIRE_REFLOGS_REWRITE),
OPT_BIT(0, "updateref", &flags,
N_("update the reference to the value of the top reflog entry"),
EXPIRE_REFLOGS_UPDATE_REF),
OPT_BOOL(0, "verbose", &verbose, N_("print extra information on screen.")),
OPT_END()
};
argc = parse_options(argc, argv, prefix, options, reflog_delete_usage, 0);
if (verbose)
should_prune_fn = should_expire_reflog_ent_verbose;
if (argc < 1)
return error(_("no reflog specified to delete"));
for (i = 0; i < argc; i++) {
const char *spec = strstr(argv[i], "@{");
char *ep, *ref;
int recno;
struct expire_reflog_policy_cb cb = {
.dry_run = !!(flags & EXPIRE_REFLOGS_DRY_RUN),
};
if (!spec) {
status |= error(_("not a reflog: %s"), argv[i]);
continue;
}
if (!dwim_log(argv[i], spec - argv[i], NULL, &ref)) {
status |= error(_("no reflog for '%s'"), argv[i]);
continue;
}
recno = strtoul(spec + 2, &ep, 10);
if (*ep == '}') {
cmd.recno = -recno;
for_each_reflog_ent(ref, count_reflog_ent, &cmd);
} else {
cmd.expire_total = approxidate(spec + 2);
for_each_reflog_ent(ref, count_reflog_ent, &cmd);
cmd.expire_total = 0;
}
cb.cmd = cmd;
status |= reflog_expire(ref, flags,
reflog_expiry_prepare,
should_prune_fn,
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);
}