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tag: v1.6.4.1
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#include "builtin.h"
#include "cache.h"
#include "refs.h"
#include "object.h"
#include "tag.h"
#include "string-list.h"
#include "parse-options.h"

static const char * const show_ref_usage[] = {
"git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--dereference] [-s|--hash[=<n>]] [--abbrev[=<n>]] [--tags] [--heads] [--] [pattern*] ",
"git show-ref --exclude-existing[=pattern] < ref-list",
NULL
};

static int deref_tags, show_head, tags_only, heads_only, found_match, verify,
quiet, hash_only, abbrev, exclude_arg;
static const char **pattern;
static const char *exclude_existing_arg;

static void show_one(const char *refname, const unsigned char *sha1)
{
const char *hex = find_unique_abbrev(sha1, abbrev);
if (hash_only)
printf("%s\n", hex);
else
printf("%s %s\n", hex, refname);
}

static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
{
struct object *obj;
const char *hex;
unsigned char peeled[20];

if (tags_only || heads_only) {
int match;

match = heads_only && !prefixcmp(refname, "refs/heads/");
match |= tags_only && !prefixcmp(refname, "refs/tags/");
if (!match)
return 0;
}
if (pattern) {
int reflen = strlen(refname);
const char **p = pattern, *m;
while ((m = *p++) != NULL) {
int len = strlen(m);
if (len > reflen)
continue;
if (memcmp(m, refname + reflen - len, len))
continue;
if (len == reflen)
goto match;
/* "--verify" requires an exact match */
if (verify)
continue;
if (refname[reflen - len - 1] == '/')
goto match;
}
return 0;
}

match:
found_match++;

/* This changes the semantics slightly that even under quiet we
* detect and return error if the repository is corrupt and
* ref points at a nonexistent object.
*/
if (!has_sha1_file(sha1))
die("git show-ref: bad ref %s (%s)", refname,
sha1_to_hex(sha1));

if (quiet)
return 0;

show_one(refname, sha1);

if (!deref_tags)
return 0;

if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
if (!is_null_sha1(peeled)) {
hex = find_unique_abbrev(peeled, abbrev);
printf("%s %s^{}\n", hex, refname);
}
}
else {
obj = parse_object(sha1);
if (!obj)
die("git show-ref: bad ref %s (%s)", refname,
sha1_to_hex(sha1));
if (obj->type == OBJ_TAG) {
obj = deref_tag(obj, refname, 0);
if (!obj)
die("git show-ref: bad tag at ref %s (%s)", refname,
sha1_to_hex(sha1));
hex = find_unique_abbrev(obj->sha1, abbrev);
printf("%s %s^{}\n", hex, refname);
}
}
return 0;
}

static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
{
struct string_list *list = (struct string_list *)cbdata;
string_list_insert(refname, list);
return 0;
}

/*
* read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
* and
* (1) strip "^{}" at the end of line if any;
* (2) ignore if match is provided and does not head-match refname;
* (3) warn if refname is not a well-formed refname and skip;
* (4) ignore if refname is a ref that exists in the local repository;
* (5) otherwise output the line.
*/
static int exclude_existing(const char *match)
{
static struct string_list existing_refs = { NULL, 0, 0, 0 };
char buf[1024];
int matchlen = match ? strlen(match) : 0;

for_each_ref(add_existing, &existing_refs);
while (fgets(buf, sizeof(buf), stdin)) {
char *ref;
int len = strlen(buf);

if (len > 0 && buf[len - 1] == '\n')
buf[--len] = '\0';
if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
len -= 3;
buf[len] = '\0';
}
for (ref = buf + len; buf < ref; ref--)
if (isspace(ref[-1]))
break;
if (match) {
int reflen = buf + len - ref;
if (reflen < matchlen)
continue;
if (strncmp(ref, match, matchlen))
continue;
}
if (check_ref_format(ref)) {
warning("ref '%s' ignored", ref);
continue;
}
if (!string_list_has_string(&existing_refs, ref)) {
printf("%s\n", buf);
}
}
return 0;
}

static int hash_callback(const struct option *opt, const char *arg, int unset)
{
hash_only = 1;
/* Use full length SHA1 if no argument */
if (!arg)
return 0;
return parse_opt_abbrev_cb(opt, arg, unset);
}

static int exclude_existing_callback(const struct option *opt, const char *arg,
int unset)
{
exclude_arg = 1;
*(const char **)opt->value = arg;
return 0;
}

static int help_callback(const struct option *opt, const char *arg, int unset)
{
return -1;
}

static const struct option show_ref_options[] = {
OPT_BOOLEAN(0, "tags", &tags_only, "only show tags (can be combined with heads)"),
OPT_BOOLEAN(0, "heads", &heads_only, "only show heads (can be combined with tags)"),
OPT_BOOLEAN(0, "verify", &verify, "stricter reference checking, "
"requires exact ref path"),
OPT_BOOLEAN('h', "head", &show_head, "show the HEAD reference"),
OPT_BOOLEAN('d', "dereference", &deref_tags,
"dereference tags into object IDs"),
{ OPTION_CALLBACK, 's', "hash", &abbrev, "n",
"only show SHA1 hash using <n> digits",
PARSE_OPT_OPTARG, &hash_callback },
OPT__ABBREV(&abbrev),
OPT__QUIET(&quiet),
{ OPTION_CALLBACK, 0, "exclude-existing", &exclude_existing_arg,
"pattern", "show refs from stdin that aren't in local repository",
PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback },
{ OPTION_CALLBACK, 0, "help-all", NULL, NULL, "show usage",
PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
OPT_END()
};

int cmd_show_ref(int argc, const char **argv, const char *prefix)
{
argc = parse_options(argc, argv, prefix, show_ref_options,
show_ref_usage, PARSE_OPT_NO_INTERNAL_HELP);

if (exclude_arg)
return exclude_existing(exclude_existing_arg);

pattern = argv;
if (!*pattern)
pattern = NULL;

if (verify) {
if (!pattern)
die("--verify requires a reference");
while (*pattern) {
unsigned char sha1[20];

if (!prefixcmp(*pattern, "refs/") &&
resolve_ref(*pattern, sha1, 1, NULL)) {
if (!quiet)
show_one(*pattern, sha1);
}
else if (!quiet)
die("'%s' - not a valid ref", *pattern);
else
return 1;
pattern++;
}
return 0;
}

if (show_head)
head_ref(show_ref, NULL);
for_each_ref(show_ref, NULL);
if (!found_match) {
if (verify && !quiet)
die("No match");
return 1;
}
return 0;
}
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