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git/builtin/describe.c

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#include "builtin.h"
#include "config.h"
#include "environment.h"
#include "gettext.h"
#include "hex.h"
#include "lockfile.h"
#include "commit.h"
#include "tag.h"
#include "refs.h"
#include "object-name.h"
#include "parse-options.h"
#include "read-cache-ll.h"
#include "revision.h"
#include "diff.h"
#include "hashmap.h"
#include "setup.h"
#include "strvec.h"
#include "run-command.h"
#include "object-store-ll.h"
#include "list-objects.h"
#include "commit-slab.h"
#include "wildmatch.h"
#define MAX_TAGS (FLAG_BITS - 1)
#define DEFAULT_CANDIDATES 10
define_commit_slab(commit_names, struct commit_name *);
static const char * const describe_usage[] = {
N_("git describe [--all] [--tags] [--contains] [--abbrev=<n>] [<commit-ish>...]"),
N_("git describe [--all] [--tags] [--contains] [--abbrev=<n>] --dirty[=<mark>]"),
N_("git describe <blob>"),
NULL
};
static int debug; /* Display lots of verbose info */
static int all; /* Any valid ref can be used */
static int tags; /* Allow lightweight tags */
static int longformat;
static int first_parent;
static int abbrev = -1; /* unspecified */
static int max_candidates = DEFAULT_CANDIDATES;
static struct hashmap names;
static int have_util;
static struct string_list patterns = STRING_LIST_INIT_NODUP;
static struct string_list exclude_patterns = STRING_LIST_INIT_NODUP;
static int always;
static const char *suffix, *dirty, *broken;
static struct commit_names commit_names;
/* diff-index command arguments to check if working tree is dirty. */
static const char *diff_index_args[] = {
"diff-index", "--quiet", "HEAD", "--", NULL
};
static const char *update_index_args[] = {
"update-index", "--unmerged", "-q", "--refresh", NULL
};
struct commit_name {
struct hashmap_entry entry;
struct object_id peeled;
struct tag *tag;
unsigned prio:2; /* annotated tag = 2, tag = 1, head = 0 */
unsigned name_checked:1;
unsigned misnamed:1;
struct object_id oid;
char *path;
};
static const char *prio_names[] = {
N_("head"), N_("lightweight"), N_("annotated"),
};
static int commit_name_neq(const void *cmp_data UNUSED,
const struct hashmap_entry *eptr,
const struct hashmap_entry *entry_or_key,
const void *peeled)
{
const struct commit_name *cn1, *cn2;
cn1 = container_of(eptr, const struct commit_name, entry);
cn2 = container_of(entry_or_key, const struct commit_name, entry);
return !oideq(&cn1->peeled, peeled ? peeled : &cn2->peeled);
}
static inline struct commit_name *find_commit_name(const struct object_id *peeled)
{
return hashmap_get_entry_from_hash(&names, oidhash(peeled), peeled,
struct commit_name, entry);
}
static int replace_name(struct commit_name *e,
int prio,
const struct object_id *oid,
struct tag **tag)
{
if (!e || e->prio < prio)
return 1;
if (e->prio == 2 && prio == 2) {
/* Multiple annotated tags point to the same commit.
* Select one to keep based upon their tagger date.
*/
struct tag *t;
if (!e->tag) {
t = lookup_tag(the_repository, &e->oid);
if (!t || parse_tag(t))
return 1;
e->tag = t;
}
t = lookup_tag(the_repository, oid);
if (!t || parse_tag(t))
return 0;
*tag = t;
if (e->tag->date < t->date)
return 1;
}
return 0;
}
static void add_to_known_names(const char *path,
const struct object_id *peeled,
int prio,
const struct object_id *oid)
{
struct commit_name *e = find_commit_name(peeled);
struct tag *tag = NULL;
if (replace_name(e, prio, oid, &tag)) {
if (!e) {
e = xmalloc(sizeof(struct commit_name));
oidcpy(&e->peeled, peeled);
hashmap_entry_init(&e->entry, oidhash(peeled));
hashmap_add(&names, &e->entry);
e->path = NULL;
}
e->tag = tag;
e->prio = prio;
e->name_checked = 0;
e->misnamed = 0;
oidcpy(&e->oid, oid);
free(e->path);
e->path = xstrdup(path);
}
}
static int get_name(const char *path, const char *referent UNUSED, const struct object_id *oid,
int flag UNUSED, void *cb_data UNUSED)
{
int is_tag = 0;
struct object_id peeled;
int is_annotated, prio;
const char *path_to_match = NULL;
if (skip_prefix(path, "refs/tags/", &path_to_match)) {
is_tag = 1;
} else if (all) {
if ((exclude_patterns.nr || patterns.nr) &&
!skip_prefix(path, "refs/heads/", &path_to_match) &&
!skip_prefix(path, "refs/remotes/", &path_to_match)) {
/* Only accept reference of known type if there are match/exclude patterns */
return 0;
}
} else {
/* Reject anything outside refs/tags/ unless --all */
return 0;
}
/*
* If we're given exclude patterns, first exclude any tag which match
* any of the exclude pattern.
*/
if (exclude_patterns.nr) {
struct string_list_item *item;
for_each_string_list_item(item, &exclude_patterns) {
if (!wildmatch(item->string, path_to_match, 0))
return 0;
}
}
/*
* If we're given patterns, accept only tags which match at least one
* pattern.
*/
if (patterns.nr) {
int found = 0;
struct string_list_item *item;
for_each_string_list_item(item, &patterns) {
if (!wildmatch(item->string, path_to_match, 0)) {
found = 1;
break;
}
}
if (!found)
return 0;
}
/* Is it annotated? */
if (!peel_iterated_oid(the_repository, oid, &peeled)) {
is_annotated = !oideq(oid, &peeled);
} else {
oidcpy(&peeled, oid);
is_annotated = 0;
}
/*
* By default, we only use annotated tags, but with --tags
* we fall back to lightweight ones (even without --tags,
* we still remember lightweight ones, only to give hints
* in an error message). --all allows any refs to be used.
*/
if (is_annotated)
prio = 2;
else if (is_tag)
prio = 1;
else
prio = 0;
add_to_known_names(all ? path + 5 : path + 10, &peeled, prio, oid);
return 0;
}
struct possible_tag {
struct commit_name *name;
int depth;
int found_order;
unsigned flag_within;
};
static int compare_pt(const void *a_, const void *b_)
{
struct possible_tag *a = (struct possible_tag *)a_;
struct possible_tag *b = (struct possible_tag *)b_;
if (a->depth != b->depth)
return a->depth - b->depth;
if (a->found_order != b->found_order)
return a->found_order - b->found_order;
return 0;
}
static unsigned long finish_depth_computation(
struct commit_list **list,
struct possible_tag *best)
{
unsigned long seen_commits = 0;
while (*list) {
struct commit *c = pop_commit(list);
struct commit_list *parents = c->parents;
seen_commits++;
if (c->object.flags & best->flag_within) {
struct commit_list *a = *list;
while (a) {
struct commit *i = a->item;
if (!(i->object.flags & best->flag_within))
break;
a = a->next;
}
if (!a)
break;
} else
best->depth++;
while (parents) {
struct commit *p = parents->item;
repo_parse_commit(the_repository, p);
if (!(p->object.flags & SEEN))
commit_list_insert_by_date(p, list);
p->object.flags |= c->object.flags;
parents = parents->next;
}
}
return seen_commits;
}
static void append_name(struct commit_name *n, struct strbuf *dst)
{
if (n->prio == 2 && !n->tag) {
n->tag = lookup_tag(the_repository, &n->oid);
if (!n->tag || parse_tag(n->tag))
die(_("annotated tag %s not available"), n->path);
}
if (n->tag && !n->name_checked) {
if (strcmp(n->tag->tag, all ? n->path + 5 : n->path)) {
warning(_("tag '%s' is externally known as '%s'"),
n->path, n->tag->tag);
n->misnamed = 1;
}
n->name_checked = 1;
}
if (n->tag) {
if (all)
strbuf_addstr(dst, "tags/");
strbuf_addstr(dst, n->tag->tag);
} else {
strbuf_addstr(dst, n->path);
}
}
static void append_suffix(int depth, const struct object_id *oid, struct strbuf *dst)
{
strbuf_addf(dst, "-%d-g%s", depth,
repo_find_unique_abbrev(the_repository, oid, abbrev));
}
static void describe_commit(struct object_id *oid, struct strbuf *dst)
{
struct commit *cmit, *gave_up_on = NULL;
struct commit_list *list;
struct commit_name *n;
struct possible_tag all_matches[MAX_TAGS];
unsigned int match_cnt = 0, annotated_cnt = 0, cur_match;
unsigned long seen_commits = 0;
unsigned int unannotated_cnt = 0;
cmit = lookup_commit_reference(the_repository, oid);
n = find_commit_name(&cmit->object.oid);
if (n && (tags || all || n->prio == 2)) {
/*
* Exact match to an existing ref.
*/
append_name(n, dst);
if (n->misnamed || longformat)
append_suffix(0, n->tag ? get_tagged_oid(n->tag) : oid, dst);
if (suffix)
strbuf_addstr(dst, suffix);
return;
}
if (!max_candidates)
die(_("no tag exactly matches '%s'"), oid_to_hex(&cmit->object.oid));
if (debug)
fprintf(stderr, _("No exact match on refs or tags, searching to describe\n"));
if (!have_util) {
struct hashmap_iter iter;
struct commit *c;
struct commit_name *n;
init_commit_names(&commit_names);
hashmap_for_each_entry(&names, &iter, n,
entry /* member name */) {
c = lookup_commit_reference_gently(the_repository,
&n->peeled, 1);
if (c)
*commit_names_at(&commit_names, c) = n;
}
have_util = 1;
}
list = NULL;
cmit->object.flags = SEEN;
commit_list_insert(cmit, &list);
while (list) {
struct commit *c = pop_commit(&list);
struct commit_list *parents = c->parents;
struct commit_name **slot;
seen_commits++;
slot = commit_names_peek(&commit_names, c);
n = slot ? *slot : NULL;
if (n) {
if (!tags && !all && n->prio < 2) {
unannotated_cnt++;
} else if (match_cnt < max_candidates) {
struct possible_tag *t = &all_matches[match_cnt++];
t->name = n;
t->depth = seen_commits - 1;
t->flag_within = 1u << match_cnt;
t->found_order = match_cnt;
c->object.flags |= t->flag_within;
if (n->prio == 2)
annotated_cnt++;
}
else {
gave_up_on = c;
break;
}
}
for (cur_match = 0; cur_match < match_cnt; cur_match++) {
struct possible_tag *t = &all_matches[cur_match];
if (!(c->object.flags & t->flag_within))
t->depth++;
}
/* Stop if last remaining path already covered by best candidate(s) */
if (annotated_cnt && !list) {
int best_depth = INT_MAX;
unsigned best_within = 0;
for (cur_match = 0; cur_match < match_cnt; cur_match++) {
struct possible_tag *t = &all_matches[cur_match];
if (t->depth < best_depth) {
best_depth = t->depth;
best_within = t->flag_within;
} else if (t->depth == best_depth) {
best_within |= t->flag_within;
}
}
if ((c->object.flags & best_within) == best_within) {
if (debug)
fprintf(stderr, _("finished search at %s\n"),
oid_to_hex(&c->object.oid));
break;
}
}
while (parents) {
struct commit *p = parents->item;
repo_parse_commit(the_repository, p);
if (!(p->object.flags & SEEN))
commit_list_insert_by_date(p, &list);
p->object.flags |= c->object.flags;
parents = parents->next;
if (first_parent)
break;
}
}
if (!match_cnt) {
struct object_id *cmit_oid = &cmit->object.oid;
if (always) {
strbuf_add_unique_abbrev(dst, cmit_oid, abbrev);
if (suffix)
strbuf_addstr(dst, suffix);
return;
}
if (unannotated_cnt)
die(_("No annotated tags can describe '%s'.\n"
"However, there were unannotated tags: try --tags."),
oid_to_hex(cmit_oid));
else
die(_("No tags can describe '%s'.\n"
"Try --always, or create some tags."),
oid_to_hex(cmit_oid));
}
QSORT(all_matches, match_cnt, compare_pt);
if (gave_up_on) {
commit_list_insert_by_date(gave_up_on, &list);
seen_commits--;
}
seen_commits += finish_depth_computation(&list, &all_matches[0]);
free_commit_list(list);
if (debug) {
static int label_width = -1;
if (label_width < 0) {
int i, w;
for (i = 0; i < ARRAY_SIZE(prio_names); i++) {
w = strlen(_(prio_names[i]));
if (label_width < w)
label_width = w;
}
}
for (cur_match = 0; cur_match < match_cnt; cur_match++) {
struct possible_tag *t = &all_matches[cur_match];
fprintf(stderr, " %-*s %8d %s\n",
label_width, _(prio_names[t->name->prio]),
t->depth, t->name->path);
}
fprintf(stderr, _("traversed %lu commits\n"), seen_commits);
if (gave_up_on) {
fprintf(stderr,
_("more than %i tags found; listed %i most recent\n"
"gave up search at %s\n"),
max_candidates, max_candidates,
oid_to_hex(&gave_up_on->object.oid));
}
}
append_name(all_matches[0].name, dst);
if (all_matches[0].name->misnamed || abbrev)
append_suffix(all_matches[0].depth, &cmit->object.oid, dst);
if (suffix)
strbuf_addstr(dst, suffix);
}
struct process_commit_data {
struct object_id current_commit;
struct object_id looking_for;
struct strbuf *dst;
struct rev_info *revs;
};
static void process_commit(struct commit *commit, void *data)
{
struct process_commit_data *pcd = data;
pcd->current_commit = commit->object.oid;
}
static void process_object(struct object *obj, const char *path, void *data)
{
struct process_commit_data *pcd = data;
if (oideq(&pcd->looking_for, &obj->oid) && !pcd->dst->len) {
reset_revision_walk();
describe_commit(&pcd->current_commit, pcd->dst);
strbuf_addf(pcd->dst, ":%s", path);
free_commit_list(pcd->revs->commits);
pcd->revs->commits = NULL;
}
}
static void describe_blob(struct object_id oid, struct strbuf *dst)
{
struct rev_info revs;
struct strvec args = STRVEC_INIT;
struct process_commit_data pcd = { *null_oid(), oid, dst, &revs};
strvec_pushl(&args, "internal: The first arg is not parsed",
"--objects", "--in-commit-order", "--reverse", "HEAD",
NULL);
repo_init_revisions(the_repository, &revs, NULL);
if (setup_revisions(args.nr, args.v, &revs, NULL) > 1)
BUG("setup_revisions could not handle all args?");
if (prepare_revision_walk(&revs))
die("revision walk setup failed");
traverse_commit_list(&revs, process_commit, process_object, &pcd);
reset_revision_walk();
release_revisions(&revs);
strvec_clear(&args);
}
static void describe(const char *arg, int last_one)
{
struct object_id oid;
struct commit *cmit;
struct strbuf sb = STRBUF_INIT;
if (debug)
fprintf(stderr, _("describe %s\n"), arg);
if (repo_get_oid(the_repository, arg, &oid))
die(_("Not a valid object name %s"), arg);
cmit = lookup_commit_reference_gently(the_repository, &oid, 1);
if (cmit)
describe_commit(&oid, &sb);
else if (oid_object_info(the_repository, &oid, NULL) == OBJ_BLOB)
describe_blob(oid, &sb);
else
die(_("%s is neither a commit nor blob"), arg);
puts(sb.buf);
if (!last_one)
clear_commit_marks(cmit, -1);
strbuf_release(&sb);
}
static int option_parse_exact_match(const struct option *opt, const char *arg,
int unset)
{
int *val = opt->value;
BUG_ON_OPT_ARG(arg);
*val = unset ? DEFAULT_CANDIDATES : 0;
return 0;
}
int cmd_describe(int argc, const char **argv, const char *prefix)
{
int contains = 0;
struct option options[] = {
OPT_BOOL(0, "contains", &contains, N_("find the tag that comes after the commit")),
OPT_BOOL(0, "debug", &debug, N_("debug search strategy on stderr")),
OPT_BOOL(0, "all", &all, N_("use any ref")),
OPT_BOOL(0, "tags", &tags, N_("use any tag, even unannotated")),
OPT_BOOL(0, "long", &longformat, N_("always use long format")),
OPT_BOOL(0, "first-parent", &first_parent, N_("only follow first parent")),
OPT__ABBREV(&abbrev),
OPT_CALLBACK_F(0, "exact-match", &max_candidates, NULL,
N_("only output exact matches"),
PARSE_OPT_NOARG, option_parse_exact_match),
OPT_INTEGER(0, "candidates", &max_candidates,
N_("consider <n> most recent tags (default: 10)")),
OPT_STRING_LIST(0, "match", &patterns, N_("pattern"),
N_("only consider tags matching <pattern>")),
OPT_STRING_LIST(0, "exclude", &exclude_patterns, N_("pattern"),
N_("do not consider tags matching <pattern>")),
OPT_BOOL(0, "always", &always,
N_("show abbreviated commit object as fallback")),
{OPTION_STRING, 0, "dirty", &dirty, N_("mark"),
N_("append <mark> on dirty working tree (default: \"-dirty\")"),
PARSE_OPT_OPTARG, NULL, (intptr_t) "-dirty"},
{OPTION_STRING, 0, "broken", &broken, N_("mark"),
N_("append <mark> on broken working tree (default: \"-broken\")"),
PARSE_OPT_OPTARG, NULL, (intptr_t) "-broken"},
OPT_END(),
};
git_config(git_default_config, NULL);
argc = parse_options(argc, argv, prefix, options, describe_usage, 0);
if (abbrev < 0)
abbrev = DEFAULT_ABBREV;
if (max_candidates < 0)
max_candidates = 0;
else if (max_candidates > MAX_TAGS)
max_candidates = MAX_TAGS;
save_commit_buffer = 0;
if (longformat && abbrev == 0)
die(_("options '%s' and '%s' cannot be used together"), "--long", "--abbrev=0");
if (contains) {
struct string_list_item *item;
struct strvec args;
const char **argv_copy;
int ret;
strvec_init(&args);
strvec_pushl(&args, "name-rev",
"--peel-tag", "--name-only", "--no-undefined",
NULL);
if (always)
strvec_push(&args, "--always");
if (!all) {
strvec_push(&args, "--tags");
for_each_string_list_item(item, &patterns)
strvec_pushf(&args, "--refs=refs/tags/%s", item->string);
for_each_string_list_item(item, &exclude_patterns)
strvec_pushf(&args, "--exclude=refs/tags/%s", item->string);
}
if (argc)
strvec_pushv(&args, argv);
else
strvec_push(&args, "HEAD");
/*
* `cmd_name_rev()` modifies the array, so we'd leak its
* contained strings if we didn't do a copy here.
*/
ALLOC_ARRAY(argv_copy, args.nr + 1);
for (size_t i = 0; i < args.nr; i++)
argv_copy[i] = args.v[i];
argv_copy[args.nr] = NULL;
ret = cmd_name_rev(args.nr, argv_copy, prefix);
strvec_clear(&args);
free(argv_copy);
return ret;
}
hashmap_init(&names, commit_name_neq, NULL, 0);
refs_for_each_rawref(get_main_ref_store(the_repository), get_name,
NULL);
if (!hashmap_get_size(&names) && !always)
die(_("No names found, cannot describe anything."));
if (argc == 0) {
if (broken) {
struct child_process cp = CHILD_PROCESS_INIT;
strvec_pushv(&cp.args, update_index_args);
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.no_stdout = 1;
run_command(&cp);
child_process_init(&cp);
strvec_pushv(&cp.args, diff_index_args);
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.no_stdout = 1;
if (!dirty)
dirty = "-dirty";
switch (run_command(&cp)) {
case 0:
suffix = NULL;
break;
case 1:
suffix = dirty;
break;
default:
/* diff-index aborted abnormally */
suffix = broken;
}
} else if (dirty) {
struct lock_file index_lock = LOCK_INIT;
struct rev_info revs;
int fd;
setup_work_tree();
prepare_repo_settings(the_repository);
the_repository->settings.command_requires_full_index = 0;
repo_read_index(the_repository);
refresh_index(the_repository->index, REFRESH_QUIET|REFRESH_UNMERGED,
NULL, NULL, NULL);
fd = repo_hold_locked_index(the_repository,
&index_lock, 0);
if (0 <= fd)
repo_update_index_if_able(the_repository, &index_lock);
repo_init_revisions(the_repository, &revs, prefix);
if (setup_revisions(ARRAY_SIZE(diff_index_args) - 1,
diff_index_args, &revs, NULL) != 1)
BUG("malformed internal diff-index command line");
run_diff_index(&revs, 0);
if (!diff_result_code(&revs.diffopt))
suffix = NULL;
else
suffix = dirty;
release_revisions(&revs);
}
describe("HEAD", 1);
} else if (dirty) {
die(_("option '%s' and commit-ishes cannot be used together"), "--dirty");
} else if (broken) {
die(_("option '%s' and commit-ishes cannot be used together"), "--broken");
} else {
while (argc-- > 0)
describe(*argv++, argc == 0);
}
return 0;
}
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