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tag: v1.5.4-rc3
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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 "builtin.h"
#include "refs.h"
#include "tag.h"
#include "run-command.h"
#include "parse-options.h"

static const char * const git_tag_usage[] = {
"git-tag [-a|-s|-u <key-id>] [-f] [-m <msg>|-F <file>] <tagname> [<head>]",
"git-tag -d <tagname>...",
"git-tag -l [-n [<num>]] [<pattern>]",
"git-tag -v <tagname>...",
NULL
};

static char signingkey[1000];

void launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
{
const char *editor, *terminal;

editor = getenv("GIT_EDITOR");
if (!editor && editor_program)
editor = editor_program;
if (!editor)
editor = getenv("VISUAL");
if (!editor)
editor = getenv("EDITOR");

terminal = getenv("TERM");
if (!editor && (!terminal || !strcmp(terminal, "dumb"))) {
fprintf(stderr,
"Terminal is dumb but no VISUAL nor EDITOR defined.\n"
"Please supply the message using either -m or -F option.\n");
exit(1);
}

if (!editor)
editor = "vi";

if (strcmp(editor, ":")) {
size_t len = strlen(editor);
int i = 0;
const char *args[6];

if (strcspn(editor, "$ \t'") != len) {
/* there are specials */
args[i++] = "sh";
args[i++] = "-c";
args[i++] = "$0 \"$@\"";
}
args[i++] = editor;
args[i++] = path;
args[i] = NULL;

if (run_command_v_opt_cd_env(args, 0, NULL, env))
die("There was a problem with the editor %s.", editor);
}

if (!buffer)
return;
if (strbuf_read_file(buffer, path, 0) < 0)
die("could not read message file '%s': %s",
path, strerror(errno));
}

struct tag_filter {
const char *pattern;
int lines;
};

#define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"

static int show_reference(const char *refname, const unsigned char *sha1,
int flag, void *cb_data)
{
struct tag_filter *filter = cb_data;

if (!fnmatch(filter->pattern, refname, 0)) {
int i;
unsigned long size;
enum object_type type;
char *buf, *sp, *eol;
size_t len;

if (!filter->lines) {
printf("%s\n", refname);
return 0;
}
printf("%-15s ", refname);

buf = read_sha1_file(sha1, &type, &size);
if (!buf || !size)
return 0;

/* skip header */
sp = strstr(buf, "\n\n");
if (!sp) {
free(buf);
return 0;
}
/* only take up to "lines" lines, and strip the signature */
for (i = 0, sp += 2;
i < filter->lines && sp < buf + size &&
prefixcmp(sp, PGP_SIGNATURE "\n");
i++) {
if (i)
printf("\n ");
eol = memchr(sp, '\n', size - (sp - buf));
len = eol ? eol - sp : size - (sp - buf);
fwrite(sp, len, 1, stdout);
if (!eol)
break;
sp = eol + 1;
}
putchar('\n');
free(buf);
}

return 0;
}

static int list_tags(const char *pattern, int lines)
{
struct tag_filter filter;

if (pattern == NULL)
pattern = "*";

filter.pattern = pattern;
filter.lines = lines;

for_each_tag_ref(show_reference, (void *) &filter);

return 0;
}

typedef int (*each_tag_name_fn)(const char *name, const char *ref,
const unsigned char *sha1);

static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
{
const char **p;
char ref[PATH_MAX];
int had_error = 0;
unsigned char sha1[20];

for (p = argv; *p; p++) {
if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
>= sizeof(ref)) {
error("tag name too long: %.*s...", 50, *p);
had_error = 1;
continue;
}
if (!resolve_ref(ref, sha1, 1, NULL)) {
error("tag '%s' not found.", *p);
had_error = 1;
continue;
}
if (fn(*p, ref, sha1))
had_error = 1;
}
return had_error;
}

static int delete_tag(const char *name, const char *ref,
const unsigned char *sha1)
{
if (delete_ref(ref, sha1))
return 1;
printf("Deleted tag '%s'\n", name);
return 0;
}

static int verify_tag(const char *name, const char *ref,
const unsigned char *sha1)
{
const char *argv_verify_tag[] = {"git-verify-tag",
"-v", "SHA1_HEX", NULL};
argv_verify_tag[2] = sha1_to_hex(sha1);

if (run_command_v_opt(argv_verify_tag, 0))
return error("could not verify the tag '%s'", name);
return 0;
}

static int do_sign(struct strbuf *buffer)
{
struct child_process gpg;
const char *args[4];
char *bracket;
int len;

if (!*signingkey) {
if (strlcpy(signingkey, git_committer_info(IDENT_ERROR_ON_NO_NAME),
sizeof(signingkey)) > sizeof(signingkey) - 1)
return error("committer info too long.");
bracket = strchr(signingkey, '>');
if (bracket)
bracket[1] = '\0';
}

/* When the username signingkey is bad, program could be terminated
* because gpg exits without reading and then write gets SIGPIPE. */
signal(SIGPIPE, SIG_IGN);

memset(&gpg, 0, sizeof(gpg));
gpg.argv = args;
gpg.in = -1;
gpg.out = -1;
args[0] = "gpg";
args[1] = "-bsau";
args[2] = signingkey;
args[3] = NULL;

if (start_command(&gpg))
return error("could not run gpg.");

if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
close(gpg.in);
finish_command(&gpg);
return error("gpg did not accept the tag data");
}
close(gpg.in);
gpg.close_in = 0;
len = strbuf_read(buffer, gpg.out, 1024);

if (finish_command(&gpg) || !len || len < 0)
return error("gpg failed to sign the tag");

if (len < 0)
return error("could not read the entire signature from gpg.");

return 0;
}

static const char tag_template[] =
"\n"
"#\n"
"# Write a tag message\n"
"#\n";

static void set_signingkey(const char *value)
{
if (strlcpy(signingkey, value, sizeof(signingkey)) >= sizeof(signingkey))
die("signing key value too long (%.10s...)", value);
}

static int git_tag_config(const char *var, const char *value)
{
if (!strcmp(var, "user.signingkey")) {
if (!value)
die("user.signingkey without value");
set_signingkey(value);
return 0;
}

return git_default_config(var, value);
}

static void write_tag_body(int fd, const unsigned char *sha1)
{
unsigned long size;
enum object_type type;
char *buf, *sp, *eob;
size_t len;

buf = read_sha1_file(sha1, &type, &size);
if (!buf)
return;
/* skip header */
sp = strstr(buf, "\n\n");

if (!sp || !size || type != OBJ_TAG) {
free(buf);
return;
}
sp += 2; /* skip the 2 LFs */
eob = strstr(sp, "\n" PGP_SIGNATURE "\n");
if (eob)
len = eob - sp;
else
len = buf + size - sp;
write_or_die(fd, sp, len);

free(buf);
}

static void create_tag(const unsigned char *object, const char *tag,
struct strbuf *buf, int message, int sign,
unsigned char *prev, unsigned char *result)
{
enum object_type type;
char header_buf[1024];
int header_len;

type = sha1_object_info(object, NULL);
if (type <= OBJ_NONE)
die("bad object type.");

header_len = snprintf(header_buf, sizeof(header_buf),
"object %s\n"
"type %s\n"
"tag %s\n"
"tagger %s\n\n",
sha1_to_hex(object),
typename(type),
tag,
git_committer_info(IDENT_ERROR_ON_NO_NAME));

if (header_len > sizeof(header_buf) - 1)
die("tag header too big.");

if (!message) {
char *path;
int fd;

/* write the template message before editing: */
path = xstrdup(git_path("TAG_EDITMSG"));
fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
if (fd < 0)
die("could not create file '%s': %s",
path, strerror(errno));

if (!is_null_sha1(prev))
write_tag_body(fd, prev);
else
write_or_die(fd, tag_template, strlen(tag_template));
close(fd);

launch_editor(path, buf, NULL);

unlink(path);
free(path);
}

stripspace(buf, 1);

if (!message && !buf->len)
die("no tag message?");

strbuf_insert(buf, 0, header_buf, header_len);

if (sign && do_sign(buf) < 0)
die("unable to sign the tag");
if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
die("unable to write tag file");
}

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;

if (!arg)
return -1;
if (msg->buf.len)
strbuf_addstr(&(msg->buf), "\n\n");
strbuf_addstr(&(msg->buf), arg);
msg->given = 1;
return 0;
}

int cmd_tag(int argc, const char **argv, const char *prefix)
{
struct strbuf buf;
unsigned char object[20], prev[20];
char ref[PATH_MAX];
const char *object_ref, *tag;
struct ref_lock *lock;

int annotate = 0, sign = 0, force = 0, lines = 0,
list = 0, delete = 0, verify = 0;
char *msgfile = NULL, *keyid = NULL;
struct msg_arg msg = { 0, STRBUF_INIT };
struct option options[] = {
OPT_BOOLEAN('l', NULL, &list, "list tag names"),
{ OPTION_INTEGER, 'n', NULL, &lines, NULL,
"print n lines of each tag message",
PARSE_OPT_OPTARG, NULL, 1 },
OPT_BOOLEAN('d', NULL, &delete, "delete tags"),
OPT_BOOLEAN('v', NULL, &verify, "verify tags"),

OPT_GROUP("Tag creation options"),
OPT_BOOLEAN('a', NULL, &annotate,
"annotated tag, needs a message"),
OPT_CALLBACK('m', NULL, &msg, "msg",
"message for the tag", parse_msg_arg),
OPT_STRING('F', NULL, &msgfile, "file", "message in a file"),
OPT_BOOLEAN('s', NULL, &sign, "annotated and GPG-signed tag"),
OPT_STRING('u', NULL, &keyid, "key-id",
"use another key to sign the tag"),
OPT_BOOLEAN('f', NULL, &force, "replace the tag if exists"),
OPT_END()
};

git_config(git_tag_config);

argc = parse_options(argc, argv, options, git_tag_usage, 0);

if (keyid) {
sign = 1;
set_signingkey(keyid);
}
if (sign)
annotate = 1;

if (list)
return list_tags(argv[0], lines);
if (delete)
return for_each_tag_name(argv, delete_tag);
if (verify)
return for_each_tag_name(argv, verify_tag);

strbuf_init(&buf, 0);
if (msg.given || msgfile) {
if (msg.given && msgfile)
die("only one -F or -m option is allowed.");
annotate = 1;
if (msg.given)
strbuf_addbuf(&buf, &(msg.buf));
else {
if (!strcmp(msgfile, "-")) {
if (strbuf_read(&buf, 0, 1024) < 0)
die("cannot read %s", msgfile);
} else {
if (strbuf_read_file(&buf, msgfile, 1024) < 0)
die("could not open or read '%s': %s",
msgfile, strerror(errno));
}
}
}

if (argc == 0) {
if (annotate)
usage_with_options(git_tag_usage, options);
return list_tags(NULL, lines);
}
tag = argv[0];

object_ref = argc == 2 ? argv[1] : "HEAD";
if (argc > 2)
die("too many params");

if (get_sha1(object_ref, object))
die("Failed to resolve '%s' as a valid ref.", object_ref);

if (snprintf(ref, sizeof(ref), "refs/tags/%s", tag) > sizeof(ref) - 1)
die("tag name too long: %.*s...", 50, tag);
if (check_ref_format(ref))
die("'%s' is not a valid tag name.", tag);

if (!resolve_ref(ref, prev, 1, NULL))
hashclr(prev);
else if (!force)
die("tag '%s' already exists", tag);

if (annotate)
create_tag(object, tag, &buf, msg.given || msgfile,
sign, prev, object);

lock = lock_any_ref_for_update(ref, prev, 0);
if (!lock)
die("%s: cannot lock the ref", ref);
if (write_ref_sha1(lock, object, NULL) < 0)
die("%s: cannot update the ref", ref);

strbuf_release(&buf);
return 0;
}
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