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git/builtin/tag.c
ZheNing Hu 844c3f0b0b ref-filter: reuse output buffer 
When we use `git for-each-ref`, every ref will allocate
its own output strbuf and error strbuf. But we can reuse
the final strbuf for each step ref's output. The error
buffer will also be reused, despite the fact that the git
will exit when `format_ref_array_item()` return a non-zero
value and output the contents of the error buffer.

The performance for `git for-each-ref` on the Git repository
itself with performance testing tool `hyperfine` changes from
23.7 ms ± 0.9 ms to 22.2 ms ± 1.0 ms. Optimization is relatively
minor.

At the same time, we apply this optimization to `git tag -l`
and `git branch -l`.

This approach is similar to the one used by 79ed0a5
(cat-file: use a single strbuf for all output, 2018-08-14)
to speed up the cat-file builtin.

Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Jeff King <peff@peff.net>
Helped-by: René Scharfe <l.s.r@web.de>
Signed-off-by: ZheNing Hu <adlternative@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-04-20 11:09:50 -07:00

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/*
* Builtin "git tag"
*
* Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
* Carlos Rica <jasampler@gmail.com>
* Based on git-tag.sh and mktag.c by Linus Torvalds.
*/
#include "cache.h"
#include "config.h"
#include "builtin.h"
#include "refs.h"
#include "object-store.h"
#include "tag.h"
#include "run-command.h"
#include "parse-options.h"
#include "diff.h"
#include "revision.h"
#include "gpg-interface.h"
#include "oid-array.h"
#include "column.h"
#include "ref-filter.h"
static const char * const git_tag_usage[] = {
N_("git tag [-a | -s | -u <key-id>] [-f] [-m <msg> | -F <file>]\n"
"\t\t<tagname> [<head>]"),
N_("git tag -d <tagname>..."),
N_("git tag -l [-n[<num>]] [--contains <commit>] [--no-contains <commit>] [--points-at <object>]\n"
"\t\t[--format=<format>] [--merged <commit>] [--no-merged <commit>] [<pattern>...]"),
N_("git tag -v [--format=<format>] <tagname>..."),
NULL
};
static unsigned int colopts;
static int force_sign_annotate;
static int config_sign_tag = -1; /* unspecified */
static int list_tags(struct ref_filter *filter, struct ref_sorting *sorting,
struct ref_format *format)
{
struct ref_array array;
struct strbuf output = STRBUF_INIT;
struct strbuf err = STRBUF_INIT;
char *to_free = NULL;
int i;
memset(&array, 0, sizeof(array));
if (filter->lines == -1)
filter->lines = 0;
if (!format->format) {
if (filter->lines) {
to_free = xstrfmt("%s %%(contents:lines=%d)",
"%(align:15)%(refname:lstrip=2)%(end)",
filter->lines);
format->format = to_free;
} else
format->format = "%(refname:lstrip=2)";
}
if (verify_ref_format(format))
die(_("unable to parse format string"));
filter->with_commit_tag_algo = 1;
filter_refs(&array, filter, FILTER_REFS_TAGS);
ref_array_sort(sorting, &array);
for (i = 0; i < array.nr; i++) {
strbuf_reset(&output);
strbuf_reset(&err);
if (format_ref_array_item(array.items[i], format, &output, &err))
die("%s", err.buf);
fwrite(output.buf, 1, output.len, stdout);
putchar('\n');
}
strbuf_release(&err);
strbuf_release(&output);
ref_array_clear(&array);
free(to_free);
return 0;
}
typedef int (*each_tag_name_fn)(const char *name, const char *ref,
const struct object_id *oid, void *cb_data);
static int for_each_tag_name(const char **argv, each_tag_name_fn fn,
void *cb_data)
{
const char **p;
struct strbuf ref = STRBUF_INIT;
int had_error = 0;
struct object_id oid;
for (p = argv; *p; p++) {
strbuf_reset(&ref);
strbuf_addf(&ref, "refs/tags/%s", *p);
if (read_ref(ref.buf, &oid)) {
error(_("tag '%s' not found."), *p);
had_error = 1;
continue;
}
if (fn(*p, ref.buf, &oid, cb_data))
had_error = 1;
}
strbuf_release(&ref);
return had_error;
}
static int collect_tags(const char *name, const char *ref,
const struct object_id *oid, void *cb_data)
{
struct string_list *ref_list = cb_data;
string_list_append(ref_list, ref);
ref_list->items[ref_list->nr - 1].util = oiddup(oid);
return 0;
}
static int delete_tags(const char **argv)
{
int result;
struct string_list refs_to_delete = STRING_LIST_INIT_DUP;
struct string_list_item *item;
result = for_each_tag_name(argv, collect_tags, (void *)&refs_to_delete);
if (delete_refs(NULL, &refs_to_delete, REF_NO_DEREF))
result = 1;
for_each_string_list_item(item, &refs_to_delete) {
const char *name = item->string;
struct object_id *oid = item->util;
if (!ref_exists(name))
printf(_("Deleted tag '%s' (was %s)\n"),
item->string + 10,
find_unique_abbrev(oid, DEFAULT_ABBREV));
free(oid);
}
string_list_clear(&refs_to_delete, 0);
return result;
}
static int verify_tag(const char *name, const char *ref,
const struct object_id *oid, void *cb_data)
{
int flags;
const struct ref_format *format = cb_data;
flags = GPG_VERIFY_VERBOSE;
if (format->format)
flags = GPG_VERIFY_OMIT_STATUS;
if (gpg_verify_tag(oid, name, flags))
return -1;
if (format->format)
pretty_print_ref(name, oid, format);
return 0;
}
static int do_sign(struct strbuf *buffer)
{
return sign_buffer(buffer, buffer, get_signing_key());
}
static const char tag_template[] =
N_("\nWrite a message for tag:\n %s\n"
"Lines starting with '%c' will be ignored.\n");
static const char tag_template_nocleanup[] =
N_("\nWrite a message for tag:\n %s\n"
"Lines starting with '%c' will be kept; you may remove them"
" yourself if you want to.\n");
static int git_tag_config(const char *var, const char *value, void *cb)
{
int status;
struct ref_sorting **sorting_tail = (struct ref_sorting **)cb;
if (!strcmp(var, "tag.gpgsign")) {
config_sign_tag = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "tag.sort")) {
if (!value)
return config_error_nonbool(var);
parse_ref_sorting(sorting_tail, value);
return 0;
}
status = git_gpg_config(var, value, cb);
if (status)
return status;
if (!strcmp(var, "tag.forcesignannotated")) {
force_sign_annotate = git_config_bool(var, value);
return 0;
}
if (starts_with(var, "column."))
return git_column_config(var, value, "tag", &colopts);
return git_color_default_config(var, value, cb);
}
static void write_tag_body(int fd, const struct object_id *oid)
{
unsigned long size;
enum object_type type;
char *buf, *sp, *orig;
struct strbuf payload = STRBUF_INIT;
struct strbuf signature = STRBUF_INIT;
orig = buf = read_object_file(oid, &type, &size);
if (!buf)
return;
if (parse_signature(buf, size, &payload, &signature)) {
buf = payload.buf;
size = payload.len;
}
/* skip header */
sp = strstr(buf, "\n\n");
if (!sp || !size || type != OBJ_TAG) {
free(buf);
return;
}
sp += 2; /* skip the 2 LFs */
write_or_die(fd, sp, buf + size - sp);
free(orig);
strbuf_release(&payload);
strbuf_release(&signature);
}
static int build_tag_object(struct strbuf *buf, int sign, struct object_id *result)
{
if (sign && do_sign(buf) < 0)
return error(_("unable to sign the tag"));
if (write_object_file(buf->buf, buf->len, tag_type, result) < 0)
return error(_("unable to write tag file"));
return 0;
}
struct create_tag_options {
unsigned int message_given:1;
unsigned int use_editor:1;
unsigned int sign;
enum {
CLEANUP_NONE,
CLEANUP_SPACE,
CLEANUP_ALL
} cleanup_mode;
};
static const char message_advice_nested_tag[] =
N_("You have created a nested tag. The object referred to by your new tag is\n"
"already a tag. If you meant to tag the object that it points to, use:\n"
"\n"
"\tgit tag -f %s %s^{}");
static void create_tag(const struct object_id *object, const char *object_ref,
const char *tag,
struct strbuf *buf, struct create_tag_options *opt,
struct object_id *prev, struct object_id *result)
{
enum object_type type;
struct strbuf header = STRBUF_INIT;
char *path = NULL;
type = oid_object_info(the_repository, object, NULL);
if (type <= OBJ_NONE)
die(_("bad object type."));
if (type == OBJ_TAG)
advise_if_enabled(ADVICE_NESTED_TAG, _(message_advice_nested_tag),
tag, object_ref);
strbuf_addf(&header,
"object %s\n"
"type %s\n"
"tag %s\n"
"tagger %s\n\n",
oid_to_hex(object),
type_name(type),
tag,
git_committer_info(IDENT_STRICT));
if (!opt->message_given || opt->use_editor) {
int fd;
/* write the template message before editing: */
path = git_pathdup("TAG_EDITMSG");
fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
if (fd < 0)
die_errno(_("could not create file '%s'"), path);
if (opt->message_given) {
write_or_die(fd, buf->buf, buf->len);
strbuf_reset(buf);
} else if (!is_null_oid(prev)) {
write_tag_body(fd, prev);
} else {
struct strbuf buf = STRBUF_INIT;
strbuf_addch(&buf, '\n');
if (opt->cleanup_mode == CLEANUP_ALL)
strbuf_commented_addf(&buf, _(tag_template), tag, comment_line_char);
else
strbuf_commented_addf(&buf, _(tag_template_nocleanup), tag, comment_line_char);
write_or_die(fd, buf.buf, buf.len);
strbuf_release(&buf);
}
close(fd);
if (launch_editor(path, buf, NULL)) {
fprintf(stderr,
_("Please supply the message using either -m or -F option.\n"));
exit(1);
}
}
if (opt->cleanup_mode != CLEANUP_NONE)
strbuf_stripspace(buf, opt->cleanup_mode == CLEANUP_ALL);
if (!opt->message_given && !buf->len)
die(_("no tag message?"));
strbuf_insert(buf, 0, header.buf, header.len);
strbuf_release(&header);
if (build_tag_object(buf, opt->sign, result) < 0) {
if (path)
fprintf(stderr, _("The tag message has been left in %s\n"),
path);
exit(128);
}
if (path) {
unlink_or_warn(path);
free(path);
}
}
static void create_reflog_msg(const struct object_id *oid, struct strbuf *sb)
{
enum object_type type;
struct commit *c;
char *buf;
unsigned long size;
int subject_len = 0;
const char *subject_start;
char *rla = getenv("GIT_REFLOG_ACTION");
if (rla) {
strbuf_addstr(sb, rla);
} else {
strbuf_addstr(sb, "tag: tagging ");
strbuf_add_unique_abbrev(sb, oid, DEFAULT_ABBREV);
}
strbuf_addstr(sb, " (");
type = oid_object_info(the_repository, oid, NULL);
switch (type) {
default:
strbuf_addstr(sb, "object of unknown type");
break;
case OBJ_COMMIT:
if ((buf = read_object_file(oid, &type, &size)) != NULL) {
subject_len = find_commit_subject(buf, &subject_start);
strbuf_insert(sb, sb->len, subject_start, subject_len);
} else {
strbuf_addstr(sb, "commit object");
}
free(buf);
if ((c = lookup_commit_reference(the_repository, oid)) != NULL)
strbuf_addf(sb, ", %s", show_date(c->date, 0, DATE_MODE(SHORT)));
break;
case OBJ_TREE:
strbuf_addstr(sb, "tree object");
break;
case OBJ_BLOB:
strbuf_addstr(sb, "blob object");
break;
case OBJ_TAG:
strbuf_addstr(sb, "other tag object");
break;
}
strbuf_addch(sb, ')');
}
struct msg_arg {
int given;
struct strbuf buf;
};
static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
{
struct msg_arg *msg = opt->value;
BUG_ON_OPT_NEG(unset);
if (!arg)
return -1;
if (msg->buf.len)
strbuf_addstr(&(msg->buf), "\n\n");
strbuf_addstr(&(msg->buf), arg);
msg->given = 1;
return 0;
}
static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
{
if (name[0] == '-')
return -1;
strbuf_reset(sb);
strbuf_addf(sb, "refs/tags/%s", name);
return check_refname_format(sb->buf, 0);
}
int cmd_tag(int argc, const char **argv, const char *prefix)
{
struct strbuf buf = STRBUF_INIT;
struct strbuf ref = STRBUF_INIT;
struct strbuf reflog_msg = STRBUF_INIT;
struct object_id object, prev;
const char *object_ref, *tag;
struct create_tag_options opt;
char *cleanup_arg = NULL;
int create_reflog = 0;
int annotate = 0, force = 0;
int cmdmode = 0, create_tag_object = 0;
const char *msgfile = NULL, *keyid = NULL;
struct msg_arg msg = { 0, STRBUF_INIT };
struct ref_transaction *transaction;
struct strbuf err = STRBUF_INIT;
struct ref_filter filter;
static struct ref_sorting *sorting = NULL, **sorting_tail = &sorting;
struct ref_format format = REF_FORMAT_INIT;
int icase = 0;
int edit_flag = 0;
struct option options[] = {
OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
{ OPTION_INTEGER, 'n', NULL, &filter.lines, N_("n"),
N_("print <n> lines of each tag message"),
PARSE_OPT_OPTARG, NULL, 1 },
OPT_CMDMODE('d', "delete", &cmdmode, N_("delete tags"), 'd'),
OPT_CMDMODE('v', "verify", &cmdmode, N_("verify tags"), 'v'),
OPT_GROUP(N_("Tag creation options")),
OPT_BOOL('a', "annotate", &annotate,
N_("annotated tag, needs a message")),
OPT_CALLBACK_F('m', "message", &msg, N_("message"),
N_("tag message"), PARSE_OPT_NONEG, parse_msg_arg),
OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
OPT_BOOL('e', "edit", &edit_flag, N_("force edit of tag message")),
OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
OPT_CLEANUP(&cleanup_arg),
OPT_STRING('u', "local-user", &keyid, N_("key-id"),
N_("use another key to sign the tag")),
OPT__FORCE(&force, N_("replace the tag if exists"), 0),
OPT_BOOL(0, "create-reflog", &create_reflog, N_("create a reflog")),
OPT_GROUP(N_("Tag listing options")),
OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),
OPT_CONTAINS(&filter.with_commit, N_("print only tags that contain the commit")),
OPT_NO_CONTAINS(&filter.no_commit, N_("print only tags that don't contain the commit")),
OPT_WITH(&filter.with_commit, N_("print only tags that contain the commit")),
OPT_WITHOUT(&filter.no_commit, N_("print only tags that don't contain the commit")),
OPT_MERGED(&filter, N_("print only tags that are merged")),
OPT_NO_MERGED(&filter, N_("print only tags that are not merged")),
OPT_REF_SORT(sorting_tail),
{
OPTION_CALLBACK, 0, "points-at", &filter.points_at, N_("object"),
N_("print only tags of the object"), PARSE_OPT_LASTARG_DEFAULT,
parse_opt_object_name, (intptr_t) "HEAD"
},
OPT_STRING( 0 , "format", &format.format, N_("format"),
N_("format to use for the output")),
OPT__COLOR(&format.use_color, N_("respect format colors")),
OPT_BOOL('i', "ignore-case", &icase, N_("sorting and filtering are case insensitive")),
OPT_END()
};
setup_ref_filter_porcelain_msg();
git_config(git_tag_config, sorting_tail);
memset(&opt, 0, sizeof(opt));
memset(&filter, 0, sizeof(filter));
filter.lines = -1;
opt.sign = -1;
argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
if (!cmdmode) {
if (argc == 0)
cmdmode = 'l';
else if (filter.with_commit || filter.no_commit ||
filter.reachable_from || filter.unreachable_from ||
filter.points_at.nr || filter.lines != -1)
cmdmode = 'l';
}
if (cmdmode == 'l')
setup_auto_pager("tag", 1);
if (opt.sign == -1)
opt.sign = cmdmode ? 0 : config_sign_tag > 0;
if (keyid) {
opt.sign = 1;
set_signing_key(keyid);
}
create_tag_object = (opt.sign || annotate || msg.given || msgfile);
if ((create_tag_object || force) && (cmdmode != 0))
usage_with_options(git_tag_usage, options);
finalize_colopts(&colopts, -1);
if (cmdmode == 'l' && filter.lines != -1) {
if (explicitly_enable_column(colopts))
die(_("--column and -n are incompatible"));
colopts = 0;
}
if (!sorting)
sorting = ref_default_sorting();
ref_sorting_set_sort_flags_all(sorting, REF_SORTING_ICASE, icase);
filter.ignore_case = icase;
if (cmdmode == 'l') {
int ret;
if (column_active(colopts)) {
struct column_options copts;
memset(&copts, 0, sizeof(copts));
copts.padding = 2;
run_column_filter(colopts, &copts);
}
filter.name_patterns = argv;
ret = list_tags(&filter, sorting, &format);
if (column_active(colopts))
stop_column_filter();
return ret;
}
if (filter.lines != -1)
die(_("-n option is only allowed in list mode"));
if (filter.with_commit)
die(_("--contains option is only allowed in list mode"));
if (filter.no_commit)
die(_("--no-contains option is only allowed in list mode"));
if (filter.points_at.nr)
die(_("--points-at option is only allowed in list mode"));
if (filter.reachable_from || filter.unreachable_from)
die(_("--merged and --no-merged options are only allowed in list mode"));
if (cmdmode == 'd')
return delete_tags(argv);
if (cmdmode == 'v') {
if (format.format && verify_ref_format(&format))
usage_with_options(git_tag_usage, options);
return for_each_tag_name(argv, verify_tag, &format);
}
if (msg.given || msgfile) {
if (msg.given && msgfile)
die(_("only one -F or -m option is allowed."));
if (msg.given)
strbuf_addbuf(&buf, &(msg.buf));
else {
if (!strcmp(msgfile, "-")) {
if (strbuf_read(&buf, 0, 1024) < 0)
die_errno(_("cannot read '%s'"), msgfile);
} else {
if (strbuf_read_file(&buf, msgfile, 1024) < 0)
die_errno(_("could not open or read '%s'"),
msgfile);
}
}
}
tag = argv[0];
object_ref = argc == 2 ? argv[1] : "HEAD";
if (argc > 2)
die(_("too many arguments"));
if (get_oid(object_ref, &object))
die(_("Failed to resolve '%s' as a valid ref."), object_ref);
if (strbuf_check_tag_ref(&ref, tag))
die(_("'%s' is not a valid tag name."), tag);
if (read_ref(ref.buf, &prev))
oidclr(&prev);
else if (!force)
die(_("tag '%s' already exists"), tag);
opt.message_given = msg.given || msgfile;
opt.use_editor = edit_flag;
if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
opt.cleanup_mode = CLEANUP_ALL;
else if (!strcmp(cleanup_arg, "verbatim"))
opt.cleanup_mode = CLEANUP_NONE;
else if (!strcmp(cleanup_arg, "whitespace"))
opt.cleanup_mode = CLEANUP_SPACE;
else
die(_("Invalid cleanup mode %s"), cleanup_arg);
create_reflog_msg(&object, &reflog_msg);
if (create_tag_object) {
if (force_sign_annotate && !annotate)
opt.sign = 1;
create_tag(&object, object_ref, tag, &buf, &opt, &prev, &object);
}
transaction = ref_transaction_begin(&err);
if (!transaction ||
ref_transaction_update(transaction, ref.buf, &object, &prev,
create_reflog ? REF_FORCE_CREATE_REFLOG : 0,
reflog_msg.buf, &err) ||
ref_transaction_commit(transaction, &err))
die("%s", err.buf);
ref_transaction_free(transaction);
if (force && !is_null_oid(&prev) && !oideq(&prev, &object))
printf(_("Updated tag '%s' (was %s)\n"), tag,
find_unique_abbrev(&prev, DEFAULT_ABBREV));
UNLEAK(buf);
UNLEAK(ref);
UNLEAK(reflog_msg);
UNLEAK(msg);
UNLEAK(err);
return 0;
}
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