builtin/show-ref.c - jrn/git - Git at Google

 #include "builtin.h"
 #include "config.h"
 #include "gettext.h"
 #include "hex.h"
 #include "refs/refs-internal.h"
 #include "object-name.h"
 #include "object-store-ll.h"
 #include "object.h"
 #include "string-list.h"
 #include "parse-options.h"

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

 struct show_one_options {
 	int quiet;
 	int hash_only;
 	int abbrev;
 	int deref_tags;
 };

 static void show_one(const struct show_one_options *opts,
 		     const char *refname, const struct object_id *oid)
 {
 	const char *hex;
 	struct object_id peeled;

 	if (!repo_has_object_file(the_repository, oid))
 		die("git show-ref: bad ref %s (%s)", refname,
 		    oid_to_hex(oid));

 	if (opts->quiet)
 		return;

 	hex = repo_find_unique_abbrev(the_repository, oid, opts->abbrev);
 	if (opts->hash_only)
 		printf("%s\n", hex);
 	else
 		printf("%s %s\n", hex, refname);

 	if (!opts->deref_tags)
 		return;

 	if (!peel_iterated_oid(oid, &peeled)) {
 		hex = repo_find_unique_abbrev(the_repository, &peeled, opts->abbrev);
 		printf("%s %s^{}\n", hex, refname);
 	}
 }

 struct show_ref_data {
 	const struct show_one_options *show_one_opts;
 	const char **patterns;
 	int found_match;
 	int show_head;
 };

 static int show_ref(const char *refname, const struct object_id *oid,
 		    int flag UNUSED, void *cbdata)
 {
 	struct show_ref_data *data = cbdata;

 	if (data->show_head && !strcmp(refname, "HEAD"))
 		goto match;

 	if (data->patterns) {
 		int reflen = strlen(refname);
 		const char **p = data->patterns, *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;
 			if (refname[reflen - len - 1] == '/')
 				goto match;
 		}
 		return 0;
 	}

 match:
 	data->found_match++;

 	show_one(data->show_one_opts, refname, oid);

 	return 0;
 }

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

 struct exclude_existing_options {
 	/*
 	 * We need an explicit `enabled` field because it is perfectly valid
 	 * for `pattern` to be `NULL` even if `--exclude-existing` was given.
 	 */
 	int enabled;
 	const char *pattern;
 };

 /*
  * 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 cmd_show_ref__exclude_existing(const struct exclude_existing_options *opts)
 {
 	struct string_list existing_refs = STRING_LIST_INIT_DUP;
 	char buf[1024];
 	int patternlen = opts->pattern ? strlen(opts->pattern) : 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 (opts->pattern) {
 			int reflen = buf + len - ref;
 			if (reflen < patternlen)
 				continue;
 			if (strncmp(ref, opts->pattern, patternlen))
 				continue;
 		}
 		if (check_refname_format(ref, 0)) {
 			warning("ref '%s' ignored", ref);
 			continue;
 		}
 		if (!string_list_has_string(&existing_refs, ref)) {
 			printf("%s\n", buf);
 		}
 	}

 	string_list_clear(&existing_refs, 0);
 	return 0;
 }

 static int cmd_show_ref__verify(const struct show_one_options *show_one_opts,
 				const char **refs)
 {
 	if (!refs || !*refs)
 		die("--verify requires a reference");

 	while (*refs) {
 		struct object_id oid;

 		if ((starts_with(*refs, "refs/") || refname_is_safe(*refs)) &&
 		    !read_ref(*refs, &oid)) {
 			show_one(show_one_opts, *refs, &oid);
 		}
 		else if (!show_one_opts->quiet)
 			die("'%s' - not a valid ref", *refs);
 		else
 			return 1;
 		refs++;
 	}

 	return 0;
 }

 struct patterns_options {
 	int show_head;
 	int heads_only;
 	int tags_only;
 };

 static int cmd_show_ref__patterns(const struct patterns_options *opts,
 				  const struct show_one_options *show_one_opts,
 				  const char **patterns)
 {
 	struct show_ref_data show_ref_data = {
 		.show_one_opts = show_one_opts,
 		.show_head = opts->show_head,
 	};

 	if (patterns && *patterns)
 		show_ref_data.patterns = patterns;

 	if (opts->show_head)
 		head_ref(show_ref, &show_ref_data);
 	if (opts->heads_only || opts->tags_only) {
 		if (opts->heads_only)
 			for_each_fullref_in("refs/heads/", show_ref, &show_ref_data);
 		if (opts->tags_only)
 			for_each_fullref_in("refs/tags/", show_ref, &show_ref_data);
 	} else {
 		for_each_ref(show_ref, &show_ref_data);
 	}
 	if (!show_ref_data.found_match)
 		return 1;

 	return 0;
 }

 static int cmd_show_ref__exists(const char **refs)
 {
 	struct strbuf unused_referent = STRBUF_INIT;
 	struct object_id unused_oid;
 	unsigned int unused_type;
 	int failure_errno = 0;
 	const char *ref;
 	int ret = 0;

 	if (!refs || !*refs)
 		die("--exists requires a reference");
 	ref = *refs++;
 	if (*refs)
 		die("--exists requires exactly one reference");

 	if (refs_read_raw_ref(get_main_ref_store(the_repository), ref,
 			      &unused_oid, &unused_referent, &unused_type,
 			      &failure_errno)) {
 		if (failure_errno == ENOENT || failure_errno == EISDIR) {
 			error(_("reference does not exist"));
 			ret = 2;
 		} else {
 			errno = failure_errno;
 			error_errno(_("failed to look up reference"));
 			ret = 1;
 		}

 		goto out;
 	}

 out:
 	strbuf_release(&unused_referent);
 	return ret;
 }

 static int hash_callback(const struct option *opt, const char *arg, int unset)
 {
 	struct show_one_options *opts = opt->value;
 	struct option abbrev_opt = *opt;

 	opts->hash_only = 1;
 	/* Use full length SHA1 if no argument */
 	if (!arg)
 		return 0;

 	abbrev_opt.value = &opts->abbrev;
 	return parse_opt_abbrev_cb(&abbrev_opt, arg, unset);
 }

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

 int cmd_show_ref(int argc, const char **argv, const char *prefix)
 {
 	struct exclude_existing_options exclude_existing_opts = {0};
 	struct patterns_options patterns_opts = {0};
 	struct show_one_options show_one_opts = {0};
 	int verify = 0, exists = 0;
 	const struct option show_ref_options[] = {
 		OPT_BOOL(0, "tags", &patterns_opts.tags_only, N_("only show tags (can be combined with heads)")),
 		OPT_BOOL(0, "heads", &patterns_opts.heads_only, N_("only show heads (can be combined with tags)")),
 		OPT_BOOL(0, "exists", &exists, N_("check for reference existence without resolving")),
 		OPT_BOOL(0, "verify", &verify, N_("stricter reference checking, "
 			    "requires exact ref path")),
 		OPT_HIDDEN_BOOL('h', NULL, &patterns_opts.show_head,
 				N_("show the HEAD reference, even if it would be filtered out")),
 		OPT_BOOL(0, "head", &patterns_opts.show_head,
 		  N_("show the HEAD reference, even if it would be filtered out")),
 		OPT_BOOL('d', "dereference", &show_one_opts.deref_tags,
 			    N_("dereference tags into object IDs")),
 		OPT_CALLBACK_F('s', "hash", &show_one_opts, N_("n"),
 			       N_("only show SHA1 hash using <n> digits"),
 			       PARSE_OPT_OPTARG, &hash_callback),
 		OPT__ABBREV(&show_one_opts.abbrev),
 		OPT__QUIET(&show_one_opts.quiet,
 			   N_("do not print results to stdout (useful with --verify)")),
 		OPT_CALLBACK_F(0, "exclude-existing", &exclude_existing_opts,
 			       N_("pattern"), N_("show refs from stdin that aren't in local repository"),
 			       PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback),
 		OPT_END()
 	};

 	git_config(git_default_config, NULL);

 	argc = parse_options(argc, argv, prefix, show_ref_options,
 			     show_ref_usage, 0);

 	die_for_incompatible_opt3(exclude_existing_opts.enabled, "--exclude-existing",
 				  verify, "--verify",
 				  exists, "--exists");

 	if (exclude_existing_opts.enabled)
 		return cmd_show_ref__exclude_existing(&exclude_existing_opts);
 	else if (verify)
 		return cmd_show_ref__verify(&show_one_opts, argv);
 	else if (exists)
 		return cmd_show_ref__exists(argv);
 	else
 		return cmd_show_ref__patterns(&patterns_opts, &show_one_opts, argv);
 }
	#include "builtin.h"
	#include "config.h"
	#include "gettext.h"
	#include "hex.h"
	#include "refs/refs-internal.h"
	#include "object-name.h"
	#include "object-store-ll.h"
	#include "object.h"
	#include "string-list.h"
	#include "parse-options.h"

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

	struct show_one_options {
	int quiet;
	int hash_only;
	int abbrev;
	int deref_tags;
	};

	static void show_one(const struct show_one_options *opts,
	const char refname, const struct object_id oid)
	{
	const char *hex;
	struct object_id peeled;

	if (!repo_has_object_file(the_repository, oid))
	die("git show-ref: bad ref %s (%s)", refname,
	oid_to_hex(oid));

	if (opts->quiet)
	return;

	hex = repo_find_unique_abbrev(the_repository, oid, opts->abbrev);
	if (opts->hash_only)
	printf("%s\n", hex);
	else
	printf("%s %s\n", hex, refname);

	if (!opts->deref_tags)
	return;

	if (!peel_iterated_oid(oid, &peeled)) {
	hex = repo_find_unique_abbrev(the_repository, &peeled, opts->abbrev);
	printf("%s %s^{}\n", hex, refname);
	}
	}

	struct show_ref_data {
	const struct show_one_options *show_one_opts;
	const char **patterns;
	int found_match;
	int show_head;
	};

	static int show_ref(const char refname, const struct object_id oid,
	int flag UNUSED, void *cbdata)
	{
	struct show_ref_data *data = cbdata;

	if (data->show_head && !strcmp(refname, "HEAD"))
	goto match;

	if (data->patterns) {
	int reflen = strlen(refname);
	const char *p = data->patterns, 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;
	if (refname[reflen - len - 1] == '/')
	goto match;
	}
	return 0;
	}

	match:
	data->found_match++;

	show_one(data->show_one_opts, refname, oid);

	return 0;
	}

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

	struct exclude_existing_options {
	/*
	* We need an explicit `enabled` field because it is perfectly valid
	* for `pattern` to be `NULL` even if `--exclude-existing` was given.
	*/
	int enabled;
	const char *pattern;
	};

	/*
	* 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 cmd_show_ref__exclude_existing(const struct exclude_existing_options *opts)
	{
	struct string_list existing_refs = STRING_LIST_INIT_DUP;
	char buf[1024];
	int patternlen = opts->pattern ? strlen(opts->pattern) : 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 (opts->pattern) {
	int reflen = buf + len - ref;
	if (reflen < patternlen)
	continue;
	if (strncmp(ref, opts->pattern, patternlen))
	continue;
	}
	if (check_refname_format(ref, 0)) {
	warning("ref '%s' ignored", ref);
	continue;
	}
	if (!string_list_has_string(&existing_refs, ref)) {
	printf("%s\n", buf);
	}
	}

	string_list_clear(&existing_refs, 0);
	return 0;
	}

	static int cmd_show_ref__verify(const struct show_one_options *show_one_opts,
	const char **refs)
	{
	if (!refs \|\| !*refs)
	die("--verify requires a reference");

	while (*refs) {
	struct object_id oid;

	if ((starts_with(refs, "refs/") \|\| refname_is_safe(refs)) &&
	!read_ref(*refs, &oid)) {
	show_one(show_one_opts, *refs, &oid);
	}
	else if (!show_one_opts->quiet)
	die("'%s' - not a valid ref", *refs);
	else
	return 1;
	refs++;
	}

	return 0;
	}

	struct patterns_options {
	int show_head;
	int heads_only;
	int tags_only;
	};

	static int cmd_show_ref__patterns(const struct patterns_options *opts,
	const struct show_one_options *show_one_opts,
	const char **patterns)
	{
	struct show_ref_data show_ref_data = {
	.show_one_opts = show_one_opts,
	.show_head = opts->show_head,
	};

	if (patterns && *patterns)
	show_ref_data.patterns = patterns;

	if (opts->show_head)
	head_ref(show_ref, &show_ref_data);
	if (opts->heads_only \|\| opts->tags_only) {
	if (opts->heads_only)
	for_each_fullref_in("refs/heads/", show_ref, &show_ref_data);
	if (opts->tags_only)
	for_each_fullref_in("refs/tags/", show_ref, &show_ref_data);
	} else {
	for_each_ref(show_ref, &show_ref_data);
	}
	if (!show_ref_data.found_match)
	return 1;

	return 0;
	}

	static int cmd_show_ref__exists(const char **refs)
	{
	struct strbuf unused_referent = STRBUF_INIT;
	struct object_id unused_oid;
	unsigned int unused_type;
	int failure_errno = 0;
	const char *ref;
	int ret = 0;

	if (!refs \|\| !*refs)
	die("--exists requires a reference");
	ref = *refs++;
	if (*refs)
	die("--exists requires exactly one reference");

	if (refs_read_raw_ref(get_main_ref_store(the_repository), ref,
	&unused_oid, &unused_referent, &unused_type,
	&failure_errno)) {
	if (failure_errno == ENOENT \|\| failure_errno == EISDIR) {
	error(_("reference does not exist"));
	ret = 2;
	} else {
	errno = failure_errno;
	error_errno(_("failed to look up reference"));
	ret = 1;
	}

	goto out;
	}

	out:
	strbuf_release(&unused_referent);
	return ret;
	}

	static int hash_callback(const struct option opt, const char arg, int unset)
	{
	struct show_one_options *opts = opt->value;
	struct option abbrev_opt = *opt;

	opts->hash_only = 1;
	/* Use full length SHA1 if no argument */
	if (!arg)
	return 0;

	abbrev_opt.value = &opts->abbrev;
	return parse_opt_abbrev_cb(&abbrev_opt, arg, unset);
	}

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

	int cmd_show_ref(int argc, const char *argv, const char prefix)
	{
	struct exclude_existing_options exclude_existing_opts = {0};
	struct patterns_options patterns_opts = {0};
	struct show_one_options show_one_opts = {0};
	int verify = 0, exists = 0;
	const struct option show_ref_options[] = {
	OPT_BOOL(0, "tags", &patterns_opts.tags_only, N_("only show tags (can be combined with heads)")),
	OPT_BOOL(0, "heads", &patterns_opts.heads_only, N_("only show heads (can be combined with tags)")),
	OPT_BOOL(0, "exists", &exists, N_("check for reference existence without resolving")),
	OPT_BOOL(0, "verify", &verify, N_("stricter reference checking, "
	"requires exact ref path")),
	OPT_HIDDEN_BOOL('h', NULL, &patterns_opts.show_head,
	N_("show the HEAD reference, even if it would be filtered out")),
	OPT_BOOL(0, "head", &patterns_opts.show_head,
	N_("show the HEAD reference, even if it would be filtered out")),
	OPT_BOOL('d', "dereference", &show_one_opts.deref_tags,
	N_("dereference tags into object IDs")),
	OPT_CALLBACK_F('s', "hash", &show_one_opts, N_("n"),
	N_("only show SHA1 hash using <n> digits"),
	PARSE_OPT_OPTARG, &hash_callback),
	OPT__ABBREV(&show_one_opts.abbrev),
	OPT__QUIET(&show_one_opts.quiet,
	N_("do not print results to stdout (useful with --verify)")),
	OPT_CALLBACK_F(0, "exclude-existing", &exclude_existing_opts,
	N_("pattern"), N_("show refs from stdin that aren't in local repository"),
	PARSE_OPT_OPTARG \| PARSE_OPT_NONEG, exclude_existing_callback),
	OPT_END()
	};

	git_config(git_default_config, NULL);

	argc = parse_options(argc, argv, prefix, show_ref_options,
	show_ref_usage, 0);

	die_for_incompatible_opt3(exclude_existing_opts.enabled, "--exclude-existing",
	verify, "--verify",
	exists, "--exists");

	if (exclude_existing_opts.enabled)
	return cmd_show_ref__exclude_existing(&exclude_existing_opts);
	else if (verify)
	return cmd_show_ref__verify(&show_one_opts, argv);
	else if (exists)
	return cmd_show_ref__exists(argv);
	else
	return cmd_show_ref__patterns(&patterns_opts, &show_one_opts, argv);
	}