builtin-mv.c - git - Git at Google

 /*
  * "git mv" builtin command
  *
  * Copyright (C) 2006 Johannes Schindelin
  */
 #include "cache.h"
 #include "builtin.h"
 #include "dir.h"
 #include "cache-tree.h"
 #include "path-list.h"

 static const char builtin_mv_usage[] =
 "git-mv [-n] [-f] (<source> <destination> | [-k] <source>... <destination>)";

 static const char **copy_pathspec(const char *prefix, const char **pathspec,
 				  int count, int base_name)
 {
 	int i;
 	const char **result = xmalloc((count + 1) * sizeof(const char *));
 	memcpy(result, pathspec, count * sizeof(const char *));
 	result[count] = NULL;
 	for (i = 0; i < count; i++) {
 		int length = strlen(result[i]);
 		if (length > 0 && result[i][length - 1] == '/') {
 			char *without_slash = xmalloc(length);
 			memcpy(without_slash, result[i], length - 1);
 			without_slash[length - 1] = '\0';
 			result[i] = without_slash;
 		}
 		if (base_name) {
 			const char *last_slash = strrchr(result[i], '/');
 			if (last_slash)
 				result[i] = last_slash + 1;
 		}
 	}
 	return get_pathspec(prefix, result);
 }

 static void show_list(const char *label, struct path_list *list)
 {
 	if (list->nr > 0) {
 		int i;
 		printf("%s", label);
 		for (i = 0; i < list->nr; i++)
 			printf("%s%s", i > 0 ? ", " : "", list->items[i].path);
 		putchar('\n');
 	}
 }

 static const char *add_slash(const char *path)
 {
 	int len = strlen(path);
 	if (path[len - 1] != '/') {
 		char *with_slash = xmalloc(len + 2);
 		memcpy(with_slash, path, len);
 		with_slash[len++] = '/';
 		with_slash[len] = 0;
 		return with_slash;
 	}
 	return path;
 }

 static struct lock_file lock_file;

 int cmd_mv(int argc, const char **argv, const char *prefix)
 {
 	int i, newfd, count;
 	int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
 	const char **source, **destination, **dest_path;
 	enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
 	struct stat st;
 	struct path_list overwritten = {NULL, 0, 0, 0};
 	struct path_list src_for_dst = {NULL, 0, 0, 0};
 	struct path_list added = {NULL, 0, 0, 0};
 	struct path_list deleted = {NULL, 0, 0, 0};
 	struct path_list changed = {NULL, 0, 0, 0};

 	git_config(git_default_config);

 	newfd = hold_lock_file_for_update(&lock_file, get_index_file(), 1);
 	if (read_cache() < 0)
 		die("index file corrupt");

 	for (i = 1; i < argc; i++) {
 		const char *arg = argv[i];

 		if (arg[0] != '-')
 			break;
 		if (!strcmp(arg, "--")) {
 			i++;
 			break;
 		}
 		if (!strcmp(arg, "-n")) {
 			show_only = 1;
 			continue;
 		}
 		if (!strcmp(arg, "-f")) {
 			force = 1;
 			continue;
 		}
 		if (!strcmp(arg, "-k")) {
 			ignore_errors = 1;
 			continue;
 		}
 		usage(builtin_mv_usage);
 	}
 	count = argc - i - 1;
 	if (count < 1)
 		usage(builtin_mv_usage);

 	source = copy_pathspec(prefix, argv + i, count, 0);
 	modes = xcalloc(count, sizeof(enum update_mode));
 	dest_path = copy_pathspec(prefix, argv + argc - 1, 1, 0);

 	if (dest_path[0][0] == '\0')
 		/* special case: "." was normalized to "" */
 		destination = copy_pathspec(dest_path[0], argv + i, count, 1);
 	else if (!lstat(dest_path[0], &st) &&
 			S_ISDIR(st.st_mode)) {
 		dest_path[0] = add_slash(dest_path[0]);
 		destination = copy_pathspec(dest_path[0], argv + i, count, 1);
 	} else {
 		if (count != 1)
 			usage(builtin_mv_usage);
 		destination = dest_path;
 	}

 	/* Checking */
 	for (i = 0; i < count; i++) {
 		const char *src = source[i], *dst = destination[i];
 		int length, src_is_dir;
 		const char *bad = NULL;

 		if (show_only)
 			printf("Checking rename of '%s' to '%s'\n", src, dst);

 		length = strlen(src);
 		if (lstat(src, &st) < 0)
 			bad = "bad source";
 		else if (!strncmp(src, dst, length) &&
 				(dst[length] == 0 || dst[length] == '/')) {
 			bad = "can not move directory into itself";
 		} else if ((src_is_dir = S_ISDIR(st.st_mode))
 				&& lstat(dst, &st) == 0)
 			bad = "cannot move directory over file";
 		else if (src_is_dir) {
 			const char *src_w_slash = add_slash(src);
 			int len_w_slash = length + 1;
 			int first, last;

 			modes[i] = WORKING_DIRECTORY;

 			first = cache_name_pos(src_w_slash, len_w_slash);
 			if (first >= 0)
 				die ("Huh? %.*s is in index?",
 						len_w_slash, src_w_slash);

 			first = -1 - first;
 			for (last = first; last < active_nr; last++) {
 				const char *path = active_cache[last]->name;
 				if (strncmp(path, src_w_slash, len_w_slash))
 					break;
 			}
 			free((char *)src_w_slash);

 			if (last - first < 1)
 				bad = "source directory is empty";
 			else {
 				int j, dst_len;

 				if (last - first > 0) {
 					source = xrealloc(source,
 							(count + last - first)
 							* sizeof(char *));
 					destination = xrealloc(destination,
 							(count + last - first)
 							* sizeof(char *));
 					modes = xrealloc(modes,
 							(count + last - first)
 							* sizeof(enum update_mode));
 				}

 				dst = add_slash(dst);
 				dst_len = strlen(dst) - 1;

 				for (j = 0; j < last - first; j++) {
 					const char *path =
 						active_cache[first + j]->name;
 					source[count + j] = path;
 					destination[count + j] =
 						prefix_path(dst, dst_len,
 							path + length);
 					modes[count + j] = INDEX;
 				}
 				count += last - first;
 			}
 		} else if (lstat(dst, &st) == 0) {
 			bad = "destination exists";
 			if (force) {
 				/*
 				 * only files can overwrite each other:
 				 * check both source and destination
 				 */
 				if (S_ISREG(st.st_mode)) {
 					fprintf(stderr, "Warning: %s;"
 							" will overwrite!\n",
 							bad);
 					bad = NULL;
 					path_list_insert(dst, &overwritten);
 				} else
 					bad = "Cannot overwrite";
 			}
 		} else if (cache_name_pos(src, length) < 0)
 			bad = "not under version control";
 		else if (path_list_has_path(&src_for_dst, dst))
 			bad = "multiple sources for the same target";
 		else
 			path_list_insert(dst, &src_for_dst);

 		if (bad) {
 			if (ignore_errors) {
 				if (--count > 0) {
 					memmove(source + i, source + i + 1,
 						(count - i) * sizeof(char *));
 					memmove(destination + i,
 						destination + i + 1,
 						(count - i) * sizeof(char *));
 				}
 			} else
 				die ("%s, source=%s, destination=%s",
 				     bad, src, dst);
 		}
 	}

 	for (i = 0; i < count; i++) {
 		const char *src = source[i], *dst = destination[i];
 		enum update_mode mode = modes[i];
 		if (show_only || verbose)
 			printf("Renaming %s to %s\n", src, dst);
 		if (!show_only && mode != INDEX &&
 				rename(src, dst) < 0 && !ignore_errors)
 			die ("renaming %s failed: %s", src, strerror(errno));

 		if (mode == WORKING_DIRECTORY)
 			continue;

 		if (cache_name_pos(src, strlen(src)) >= 0) {
 			path_list_insert(src, &deleted);

 			/* destination can be a directory with 1 file inside */
 			if (path_list_has_path(&overwritten, dst))
 				path_list_insert(dst, &changed);
 			else
 				path_list_insert(dst, &added);
 		} else
 			path_list_insert(dst, &added);
 	}

         if (show_only) {
 		show_list("Changed  : ", &changed);
 		show_list("Adding   : ", &added);
 		show_list("Deleting : ", &deleted);
 	} else {
 		for (i = 0; i < changed.nr; i++) {
 			const char *path = changed.items[i].path;
 			int j = cache_name_pos(path, strlen(path));
 			struct cache_entry *ce = active_cache[j];

 			if (j < 0)
 				die ("Huh? Cache entry for %s unknown?", path);
 			refresh_cache_entry(ce, 0);
 		}

 		for (i = 0; i < added.nr; i++) {
 			const char *path = added.items[i].path;
 			add_file_to_index(path, verbose);
 		}

 		for (i = 0; i < deleted.nr; i++) {
 			const char *path = deleted.items[i].path;
 			remove_file_from_cache(path);
 			cache_tree_invalidate_path(active_cache_tree, path);
 		}

 		if (active_cache_changed) {
 			if (write_cache(newfd, active_cache, active_nr) ||
 			    close(newfd) ||
 			    commit_lock_file(&lock_file))
 				die("Unable to write new index file");
 		}
 	}

 	return 0;
 }
	/*
	* "git mv" builtin command
	*
	* Copyright (C) 2006 Johannes Schindelin
	*/
	#include "cache.h"
	#include "builtin.h"
	#include "dir.h"
	#include "cache-tree.h"
	#include "path-list.h"

	static const char builtin_mv_usage[] =
	"git-mv [-n] [-f] (<source> <destination> \| [-k] <source>... <destination>)";

	static const char *copy_pathspec(const char prefix, const char **pathspec,
	int count, int base_name)
	{
	int i;
	const char *result = xmalloc((count + 1) sizeof(const char *));
	memcpy(result, pathspec, count * sizeof(const char *));
	result[count] = NULL;
	for (i = 0; i < count; i++) {
	int length = strlen(result[i]);
	if (length > 0 && result[i][length - 1] == '/') {
	char *without_slash = xmalloc(length);
	memcpy(without_slash, result[i], length - 1);
	without_slash[length - 1] = '\0';
	result[i] = without_slash;
	}
	if (base_name) {
	const char *last_slash = strrchr(result[i], '/');
	if (last_slash)
	result[i] = last_slash + 1;
	}
	}
	return get_pathspec(prefix, result);
	}

	static void show_list(const char label, struct path_list list)
	{
	if (list->nr > 0) {
	int i;
	printf("%s", label);
	for (i = 0; i < list->nr; i++)
	printf("%s%s", i > 0 ? ", " : "", list->items[i].path);
	putchar('\n');
	}
	}

	static const char add_slash(const char path)
	{
	int len = strlen(path);
	if (path[len - 1] != '/') {
	char *with_slash = xmalloc(len + 2);
	memcpy(with_slash, path, len);
	with_slash[len++] = '/';
	with_slash[len] = 0;
	return with_slash;
	}
	return path;
	}

	static struct lock_file lock_file;

	int cmd_mv(int argc, const char *argv, const char prefix)
	{
	int i, newfd, count;
	int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
	const char source, destination, **dest_path;
	enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
	struct stat st;
	struct path_list overwritten = {NULL, 0, 0, 0};
	struct path_list src_for_dst = {NULL, 0, 0, 0};
	struct path_list added = {NULL, 0, 0, 0};
	struct path_list deleted = {NULL, 0, 0, 0};
	struct path_list changed = {NULL, 0, 0, 0};

	git_config(git_default_config);

	newfd = hold_lock_file_for_update(&lock_file, get_index_file(), 1);
	if (read_cache() < 0)
	die("index file corrupt");

	for (i = 1; i < argc; i++) {
	const char *arg = argv[i];

	if (arg[0] != '-')
	break;
	if (!strcmp(arg, "--")) {
	i++;
	break;
	}
	if (!strcmp(arg, "-n")) {
	show_only = 1;
	continue;
	}
	if (!strcmp(arg, "-f")) {
	force = 1;
	continue;
	}
	if (!strcmp(arg, "-k")) {
	ignore_errors = 1;
	continue;
	}
	usage(builtin_mv_usage);
	}
	count = argc - i - 1;
	if (count < 1)
	usage(builtin_mv_usage);

	source = copy_pathspec(prefix, argv + i, count, 0);
	modes = xcalloc(count, sizeof(enum update_mode));
	dest_path = copy_pathspec(prefix, argv + argc - 1, 1, 0);

	if (dest_path[0][0] == '\0')
	/* special case: "." was normalized to "" */
	destination = copy_pathspec(dest_path[0], argv + i, count, 1);
	else if (!lstat(dest_path[0], &st) &&
	S_ISDIR(st.st_mode)) {
	dest_path[0] = add_slash(dest_path[0]);
	destination = copy_pathspec(dest_path[0], argv + i, count, 1);
	} else {
	if (count != 1)
	usage(builtin_mv_usage);
	destination = dest_path;
	}

	/* Checking */
	for (i = 0; i < count; i++) {
	const char src = source[i], dst = destination[i];
	int length, src_is_dir;
	const char *bad = NULL;

	if (show_only)
	printf("Checking rename of '%s' to '%s'\n", src, dst);

	length = strlen(src);
	if (lstat(src, &st) < 0)
	bad = "bad source";
	else if (!strncmp(src, dst, length) &&
	(dst[length] == 0 \|\| dst[length] == '/')) {
	bad = "can not move directory into itself";
	} else if ((src_is_dir = S_ISDIR(st.st_mode))
	&& lstat(dst, &st) == 0)
	bad = "cannot move directory over file";
	else if (src_is_dir) {
	const char *src_w_slash = add_slash(src);
	int len_w_slash = length + 1;
	int first, last;

	modes[i] = WORKING_DIRECTORY;

	first = cache_name_pos(src_w_slash, len_w_slash);
	if (first >= 0)
	die ("Huh? %.*s is in index?",
	len_w_slash, src_w_slash);

	first = -1 - first;
	for (last = first; last < active_nr; last++) {
	const char *path = active_cache[last]->name;
	if (strncmp(path, src_w_slash, len_w_slash))
	break;
	}
	free((char *)src_w_slash);

	if (last - first < 1)
	bad = "source directory is empty";
	else {
	int j, dst_len;

	if (last - first > 0) {
	source = xrealloc(source,
	(count + last - first)
	* sizeof(char *));
	destination = xrealloc(destination,
	(count + last - first)
	* sizeof(char *));
	modes = xrealloc(modes,
	(count + last - first)
	* sizeof(enum update_mode));
	}

	dst = add_slash(dst);
	dst_len = strlen(dst) - 1;

	for (j = 0; j < last - first; j++) {
	const char *path =
	active_cache[first + j]->name;
	source[count + j] = path;
	destination[count + j] =
	prefix_path(dst, dst_len,
	path + length);
	modes[count + j] = INDEX;
	}
	count += last - first;
	}
	} else if (lstat(dst, &st) == 0) {
	bad = "destination exists";
	if (force) {
	/*
	* only files can overwrite each other:
	* check both source and destination
	*/
	if (S_ISREG(st.st_mode)) {
	fprintf(stderr, "Warning: %s;"
	" will overwrite!\n",
	bad);
	bad = NULL;
	path_list_insert(dst, &overwritten);
	} else
	bad = "Cannot overwrite";
	}
	} else if (cache_name_pos(src, length) < 0)
	bad = "not under version control";
	else if (path_list_has_path(&src_for_dst, dst))
	bad = "multiple sources for the same target";
	else
	path_list_insert(dst, &src_for_dst);

	if (bad) {
	if (ignore_errors) {
	if (--count > 0) {
	memmove(source + i, source + i + 1,
	(count - i) * sizeof(char *));
	memmove(destination + i,
	destination + i + 1,
	(count - i) * sizeof(char *));
	}
	} else
	die ("%s, source=%s, destination=%s",
	bad, src, dst);
	}
	}

	for (i = 0; i < count; i++) {
	const char src = source[i], dst = destination[i];
	enum update_mode mode = modes[i];
	if (show_only \|\| verbose)
	printf("Renaming %s to %s\n", src, dst);
	if (!show_only && mode != INDEX &&
	rename(src, dst) < 0 && !ignore_errors)
	die ("renaming %s failed: %s", src, strerror(errno));

	if (mode == WORKING_DIRECTORY)
	continue;

	if (cache_name_pos(src, strlen(src)) >= 0) {
	path_list_insert(src, &deleted);

	/* destination can be a directory with 1 file inside */
	if (path_list_has_path(&overwritten, dst))
	path_list_insert(dst, &changed);
	else
	path_list_insert(dst, &added);
	} else
	path_list_insert(dst, &added);
	}

	if (show_only) {
	show_list("Changed : ", &changed);
	show_list("Adding : ", &added);
	show_list("Deleting : ", &deleted);
	} else {
	for (i = 0; i < changed.nr; i++) {
	const char *path = changed.items[i].path;
	int j = cache_name_pos(path, strlen(path));
	struct cache_entry *ce = active_cache[j];

	if (j < 0)
	die ("Huh? Cache entry for %s unknown?", path);
	refresh_cache_entry(ce, 0);
	}

	for (i = 0; i < added.nr; i++) {
	const char *path = added.items[i].path;
	add_file_to_index(path, verbose);
	}

	for (i = 0; i < deleted.nr; i++) {
	const char *path = deleted.items[i].path;
	remove_file_from_cache(path);
	cache_tree_invalidate_path(active_cache_tree, path);
	}

	if (active_cache_changed) {
	if (write_cache(newfd, active_cache, active_nr) \|\|
	close(newfd) \|\|
	commit_lock_file(&lock_file))
	die("Unable to write new index file");
	}
	}

	return 0;
	}