builtin-checkout-index.c - jrn/git - Git at Google

 /*
  * Check-out files from the "current cache directory"
  *
  * Copyright (C) 2005 Linus Torvalds
  *
  * Careful: order of argument flags does matter. For example,
  *
  *	git checkout-index -a -f file.c
  *
  * Will first check out all files listed in the cache (but not
  * overwrite any old ones), and then force-checkout "file.c" a
  * second time (ie that one _will_ overwrite any old contents
  * with the same filename).
  *
  * Also, just doing "git checkout-index" does nothing. You probably
  * meant "git checkout-index -a". And if you want to force it, you
  * want "git checkout-index -f -a".
  *
  * Intuitiveness is not the goal here. Repeatability is. The
  * reason for the "no arguments means no work" thing is that
  * from scripts you are supposed to be able to do things like
  *
  *	find . -name '*.h' -print0 | xargs -0 git checkout-index -f --
  *
  * or:
  *
  *	find . -name '*.h' -print0 | git checkout-index -f -z --stdin
  *
  * which will force all existing *.h files to be replaced with
  * their cached copies. If an empty command line implied "all",
  * then this would force-refresh everything in the cache, which
  * was not the point.
  *
  * Oh, and the "--" is just a good idea when you know the rest
  * will be filenames. Just so that you wouldn't have a filename
  * of "-a" causing problems (not possible in the above example,
  * but get used to it in scripting!).
  */
 #include "builtin.h"
 #include "cache.h"
 #include "quote.h"
 #include "cache-tree.h"
 #include "parse-options.h"

 #define CHECKOUT_ALL 4
 static int line_termination = '\n';
 static int checkout_stage; /* default to checkout stage0 */
 static int to_tempfile;
 static char topath[4][PATH_MAX + 1];

 static struct checkout state;

 static void write_tempfile_record(const char *name, int prefix_length)
 {
 	int i;

 	if (CHECKOUT_ALL == checkout_stage) {
 		for (i = 1; i < 4; i++) {
 			if (i > 1)
 				putchar(' ');
 			if (topath[i][0])
 				fputs(topath[i], stdout);
 			else
 				putchar('.');
 		}
 	} else
 		fputs(topath[checkout_stage], stdout);

 	putchar('\t');
 	write_name_quoted(name + prefix_length, stdout, line_termination);

 	for (i = 0; i < 4; i++) {
 		topath[i][0] = 0;
 	}
 }

 static int checkout_file(const char *name, int prefix_length)
 {
 	int namelen = strlen(name);
 	int pos = cache_name_pos(name, namelen);
 	int has_same_name = 0;
 	int did_checkout = 0;
 	int errs = 0;

 	if (pos < 0)
 		pos = -pos - 1;

 	while (pos < active_nr) {
 		struct cache_entry *ce = active_cache[pos];
 		if (ce_namelen(ce) != namelen ||
 		    memcmp(ce->name, name, namelen))
 			break;
 		has_same_name = 1;
 		pos++;
 		if (ce_stage(ce) != checkout_stage
 		    && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
 			continue;
 		did_checkout = 1;
 		if (checkout_entry(ce, &state,
 		    to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
 			errs++;
 	}

 	if (did_checkout) {
 		if (to_tempfile)
 			write_tempfile_record(name, prefix_length);
 		return errs > 0 ? -1 : 0;
 	}

 	if (!state.quiet) {
 		fprintf(stderr, "git checkout-index: %s ", name);
 		if (!has_same_name)
 			fprintf(stderr, "is not in the cache");
 		else if (checkout_stage)
 			fprintf(stderr, "does not exist at stage %d",
 				checkout_stage);
 		else
 			fprintf(stderr, "is unmerged");
 		fputc('\n', stderr);
 	}
 	return -1;
 }

 static void checkout_all(const char *prefix, int prefix_length)
 {
 	int i, errs = 0;
 	struct cache_entry *last_ce = NULL;

 	for (i = 0; i < active_nr ; i++) {
 		struct cache_entry *ce = active_cache[i];
 		if (ce_stage(ce) != checkout_stage
 		    && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
 			continue;
 		if (prefix && *prefix &&
 		    (ce_namelen(ce) <= prefix_length ||
 		     memcmp(prefix, ce->name, prefix_length)))
 			continue;
 		if (last_ce && to_tempfile) {
 			if (ce_namelen(last_ce) != ce_namelen(ce)
 			    || memcmp(last_ce->name, ce->name, ce_namelen(ce)))
 				write_tempfile_record(last_ce->name, prefix_length);
 		}
 		if (checkout_entry(ce, &state,
 		    to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
 			errs++;
 		last_ce = ce;
 	}
 	if (last_ce && to_tempfile)
 		write_tempfile_record(last_ce->name, prefix_length);
 	if (errs)
 		/* we have already done our error reporting.
 		 * exit with the same code as die().
 		 */
 		exit(128);
 }

 static const char * const builtin_checkout_index_usage[] = {
 	"git checkout-index [options] [--] <file>...",
 	NULL
 };

 static struct lock_file lock_file;

 static int option_parse_u(const struct option *opt,
 			      const char *arg, int unset)
 {
 	int *newfd = opt->value;

 	state.refresh_cache = 1;
 	if (*newfd < 0)
 		*newfd = hold_locked_index(&lock_file, 1);
 	return 0;
 }

 static int option_parse_z(const struct option *opt,
 			  const char *arg, int unset)
 {
 	if (unset)
 		line_termination = '\n';
 	else
 		line_termination = 0;
 	return 0;
 }

 static int option_parse_prefix(const struct option *opt,
 			       const char *arg, int unset)
 {
 	state.base_dir = arg;
 	state.base_dir_len = strlen(arg);
 	return 0;
 }

 static int option_parse_stage(const struct option *opt,
 			      const char *arg, int unset)
 {
 	if (!strcmp(arg, "all")) {
 		to_tempfile = 1;
 		checkout_stage = CHECKOUT_ALL;
 	} else {
 		int ch = arg[0];
 		if ('1' <= ch && ch <= '3')
 			checkout_stage = arg[0] - '0';
 		else
 			die("stage should be between 1 and 3 or all");
 	}
 	return 0;
 }

 int cmd_checkout_index(int argc, const char **argv, const char *prefix)
 {
 	int i;
 	int newfd = -1;
 	int all = 0;
 	int read_from_stdin = 0;
 	int prefix_length;
 	int force = 0, quiet = 0, not_new = 0;
 	struct option builtin_checkout_index_options[] = {
 		OPT_BOOLEAN('a', "all", &all,
 			"checks out all files in the index"),
 		OPT_BOOLEAN('f', "force", &force,
 			"forces overwrite of existing files"),
 		OPT__QUIET(&quiet),
 		OPT_BOOLEAN('n', "no-create", &not_new,
 			"don't checkout new files"),
 		{ OPTION_CALLBACK, 'u', "index", &newfd, NULL,
 			"update stat information in the index file",
 			PARSE_OPT_NOARG, option_parse_u },
 		{ OPTION_CALLBACK, 'z', NULL, NULL, NULL,
 			"paths are separated with NUL character",
 			PARSE_OPT_NOARG, option_parse_z },
 		OPT_BOOLEAN(0, "stdin", &read_from_stdin,
 			"read list of paths from the standard input"),
 		OPT_BOOLEAN(0, "temp", &to_tempfile,
 			"write the content to temporary files"),
 		OPT_CALLBACK(0, "prefix", NULL, "string",
 			"when creating files, prepend <string>",
 			option_parse_prefix),
 		OPT_CALLBACK(0, "stage", NULL, NULL,
 			"copy out the files from named stage",
 			option_parse_stage),
 		OPT_END()
 	};

 	git_config(git_default_config, NULL);
 	state.base_dir = "";
 	prefix_length = prefix ? strlen(prefix) : 0;

 	if (read_cache() < 0) {
 		die("invalid cache");
 	}

 	argc = parse_options(argc, argv, prefix, builtin_checkout_index_options,
 			builtin_checkout_index_usage, 0);
 	state.force = force;
 	state.quiet = quiet;
 	state.not_new = not_new;

 	if (state.base_dir_len || to_tempfile) {
 		/* when --prefix is specified we do not
 		 * want to update cache.
 		 */
 		if (state.refresh_cache) {
 			rollback_lock_file(&lock_file);
 			newfd = -1;
 		}
 		state.refresh_cache = 0;
 	}

 	/* Check out named files first */
 	for (i = 0; i < argc; i++) {
 		const char *arg = argv[i];
 		const char *p;

 		if (all)
 			die("git checkout-index: don't mix '--all' and explicit filenames");
 		if (read_from_stdin)
 			die("git checkout-index: don't mix '--stdin' and explicit filenames");
 		p = prefix_path(prefix, prefix_length, arg);
 		checkout_file(p, prefix_length);
 		if (p < arg || p > arg + strlen(arg))
 			free((char *)p);
 	}

 	if (read_from_stdin) {
 		struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;

 		if (all)
 			die("git checkout-index: don't mix '--all' and '--stdin'");

 		while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
 			const char *p;
 			if (line_termination && buf.buf[0] == '"') {
 				strbuf_reset(&nbuf);
 				if (unquote_c_style(&nbuf, buf.buf, NULL))
 					die("line is badly quoted");
 				strbuf_swap(&buf, &nbuf);
 			}
 			p = prefix_path(prefix, prefix_length, buf.buf);
 			checkout_file(p, prefix_length);
 			if (p < buf.buf || p > buf.buf + buf.len)
 				free((char *)p);
 		}
 		strbuf_release(&nbuf);
 		strbuf_release(&buf);
 	}

 	if (all)
 		checkout_all(prefix, prefix_length);

 	if (0 <= newfd &&
 	    (write_cache(newfd, active_cache, active_nr) ||
 	     commit_locked_index(&lock_file)))
 		die("Unable to write new index file");
 	return 0;
 }
	/*
	* Check-out files from the "current cache directory"
	*
	* Copyright (C) 2005 Linus Torvalds
	*
	* Careful: order of argument flags does matter. For example,
	*
	* git checkout-index -a -f file.c
	*
	* Will first check out all files listed in the cache (but not
	* overwrite any old ones), and then force-checkout "file.c" a
	* second time (ie that one _will_ overwrite any old contents
	* with the same filename).
	*
	* Also, just doing "git checkout-index" does nothing. You probably
	* meant "git checkout-index -a". And if you want to force it, you
	* want "git checkout-index -f -a".
	*
	* Intuitiveness is not the goal here. Repeatability is. The
	* reason for the "no arguments means no work" thing is that
	* from scripts you are supposed to be able to do things like
	*
	* find . -name '*.h' -print0 \| xargs -0 git checkout-index -f --
	*
	* or:
	*
	* find . -name '*.h' -print0 \| git checkout-index -f -z --stdin
	*
	* which will force all existing *.h files to be replaced with
	* their cached copies. If an empty command line implied "all",
	* then this would force-refresh everything in the cache, which
	* was not the point.
	*
	* Oh, and the "--" is just a good idea when you know the rest
	* will be filenames. Just so that you wouldn't have a filename
	* of "-a" causing problems (not possible in the above example,
	* but get used to it in scripting!).
	*/
	#include "builtin.h"
	#include "cache.h"
	#include "quote.h"
	#include "cache-tree.h"
	#include "parse-options.h"

	#define CHECKOUT_ALL 4
	static int line_termination = '\n';
	static int checkout_stage; /* default to checkout stage0 */
	static int to_tempfile;
	static char topath[4][PATH_MAX + 1];

	static struct checkout state;

	static void write_tempfile_record(const char *name, int prefix_length)
	{
	int i;

	if (CHECKOUT_ALL == checkout_stage) {
	for (i = 1; i < 4; i++) {
	if (i > 1)
	putchar(' ');
	if (topath[i][0])
	fputs(topath[i], stdout);
	else
	putchar('.');
	}
	} else
	fputs(topath[checkout_stage], stdout);

	putchar('\t');
	write_name_quoted(name + prefix_length, stdout, line_termination);

	for (i = 0; i < 4; i++) {
	topath[i][0] = 0;
	}
	}

	static int checkout_file(const char *name, int prefix_length)
	{
	int namelen = strlen(name);
	int pos = cache_name_pos(name, namelen);
	int has_same_name = 0;
	int did_checkout = 0;
	int errs = 0;

	if (pos < 0)
	pos = -pos - 1;

	while (pos < active_nr) {
	struct cache_entry *ce = active_cache[pos];
	if (ce_namelen(ce) != namelen \|\|
	memcmp(ce->name, name, namelen))
	break;
	has_same_name = 1;
	pos++;
	if (ce_stage(ce) != checkout_stage
	&& (CHECKOUT_ALL != checkout_stage \|\| !ce_stage(ce)))
	continue;
	did_checkout = 1;
	if (checkout_entry(ce, &state,
	to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
	errs++;
	}

	if (did_checkout) {
	if (to_tempfile)
	write_tempfile_record(name, prefix_length);
	return errs > 0 ? -1 : 0;
	}

	if (!state.quiet) {
	fprintf(stderr, "git checkout-index: %s ", name);
	if (!has_same_name)
	fprintf(stderr, "is not in the cache");
	else if (checkout_stage)
	fprintf(stderr, "does not exist at stage %d",
	checkout_stage);
	else
	fprintf(stderr, "is unmerged");
	fputc('\n', stderr);
	}
	return -1;
	}

	static void checkout_all(const char *prefix, int prefix_length)
	{
	int i, errs = 0;
	struct cache_entry *last_ce = NULL;

	for (i = 0; i < active_nr ; i++) {
	struct cache_entry *ce = active_cache[i];
	if (ce_stage(ce) != checkout_stage
	&& (CHECKOUT_ALL != checkout_stage \|\| !ce_stage(ce)))
	continue;
	if (prefix && *prefix &&
	(ce_namelen(ce) <= prefix_length \|\|
	memcmp(prefix, ce->name, prefix_length)))
	continue;
	if (last_ce && to_tempfile) {
	if (ce_namelen(last_ce) != ce_namelen(ce)
	\|\| memcmp(last_ce->name, ce->name, ce_namelen(ce)))
	write_tempfile_record(last_ce->name, prefix_length);
	}
	if (checkout_entry(ce, &state,
	to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
	errs++;
	last_ce = ce;
	}
	if (last_ce && to_tempfile)
	write_tempfile_record(last_ce->name, prefix_length);
	if (errs)
	/* we have already done our error reporting.
	* exit with the same code as die().
	*/
	exit(128);
	}

	static const char * const builtin_checkout_index_usage[] = {
	"git checkout-index [options] [--] <file>...",
	NULL
	};

	static struct lock_file lock_file;

	static int option_parse_u(const struct option *opt,
	const char *arg, int unset)
	{
	int *newfd = opt->value;

	state.refresh_cache = 1;
	if (*newfd < 0)
	*newfd = hold_locked_index(&lock_file, 1);
	return 0;
	}

	static int option_parse_z(const struct option *opt,
	const char *arg, int unset)
	{
	if (unset)
	line_termination = '\n';
	else
	line_termination = 0;
	return 0;
	}

	static int option_parse_prefix(const struct option *opt,
	const char *arg, int unset)
	{
	state.base_dir = arg;
	state.base_dir_len = strlen(arg);
	return 0;
	}

	static int option_parse_stage(const struct option *opt,
	const char *arg, int unset)
	{
	if (!strcmp(arg, "all")) {
	to_tempfile = 1;
	checkout_stage = CHECKOUT_ALL;
	} else {
	int ch = arg[0];
	if ('1' <= ch && ch <= '3')
	checkout_stage = arg[0] - '0';
	else
	die("stage should be between 1 and 3 or all");
	}
	return 0;
	}

	int cmd_checkout_index(int argc, const char *argv, const char prefix)
	{
	int i;
	int newfd = -1;
	int all = 0;
	int read_from_stdin = 0;
	int prefix_length;
	int force = 0, quiet = 0, not_new = 0;
	struct option builtin_checkout_index_options[] = {
	OPT_BOOLEAN('a', "all", &all,
	"checks out all files in the index"),
	OPT_BOOLEAN('f', "force", &force,
	"forces overwrite of existing files"),
	OPT__QUIET(&quiet),
	OPT_BOOLEAN('n', "no-create", &not_new,
	"don't checkout new files"),
	{ OPTION_CALLBACK, 'u', "index", &newfd, NULL,
	"update stat information in the index file",
	PARSE_OPT_NOARG, option_parse_u },
	{ OPTION_CALLBACK, 'z', NULL, NULL, NULL,
	"paths are separated with NUL character",
	PARSE_OPT_NOARG, option_parse_z },
	OPT_BOOLEAN(0, "stdin", &read_from_stdin,
	"read list of paths from the standard input"),
	OPT_BOOLEAN(0, "temp", &to_tempfile,
	"write the content to temporary files"),
	OPT_CALLBACK(0, "prefix", NULL, "string",
	"when creating files, prepend <string>",
	option_parse_prefix),
	OPT_CALLBACK(0, "stage", NULL, NULL,
	"copy out the files from named stage",
	option_parse_stage),
	OPT_END()
	};

	git_config(git_default_config, NULL);
	state.base_dir = "";
	prefix_length = prefix ? strlen(prefix) : 0;

	if (read_cache() < 0) {
	die("invalid cache");
	}

	argc = parse_options(argc, argv, prefix, builtin_checkout_index_options,
	builtin_checkout_index_usage, 0);
	state.force = force;
	state.quiet = quiet;
	state.not_new = not_new;

	if (state.base_dir_len \|\| to_tempfile) {
	/* when --prefix is specified we do not
	* want to update cache.
	*/
	if (state.refresh_cache) {
	rollback_lock_file(&lock_file);
	newfd = -1;
	}
	state.refresh_cache = 0;
	}

	/* Check out named files first */
	for (i = 0; i < argc; i++) {
	const char *arg = argv[i];
	const char *p;

	if (all)
	die("git checkout-index: don't mix '--all' and explicit filenames");
	if (read_from_stdin)
	die("git checkout-index: don't mix '--stdin' and explicit filenames");
	p = prefix_path(prefix, prefix_length, arg);
	checkout_file(p, prefix_length);
	if (p < arg \|\| p > arg + strlen(arg))
	free((char *)p);
	}

	if (read_from_stdin) {
	struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;

	if (all)
	die("git checkout-index: don't mix '--all' and '--stdin'");

	while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
	const char *p;
	if (line_termination && buf.buf[0] == '"') {
	strbuf_reset(&nbuf);
	if (unquote_c_style(&nbuf, buf.buf, NULL))
	die("line is badly quoted");
	strbuf_swap(&buf, &nbuf);
	}
	p = prefix_path(prefix, prefix_length, buf.buf);
	checkout_file(p, prefix_length);
	if (p < buf.buf \|\| p > buf.buf + buf.len)
	free((char *)p);
	}
	strbuf_release(&nbuf);
	strbuf_release(&buf);
	}

	if (all)
	checkout_all(prefix, prefix_length);

	if (0 <= newfd &&
	(write_cache(newfd, active_cache, active_nr) \|\|
	commit_locked_index(&lock_file)))
	die("Unable to write new index file");
	return 0;
	}