git/builtin-mv.c
Junio C Hamano 40aaae88ad Better error message when we are unable to lock the index file
Most of the callers except the one in refs.c use the function to
update the index file.  Among the index writers, everybody
except write-tree dies if they cannot open it for writing.

This gives the function an extra argument, to tell it to die
when it cannot create a new file as the lockfile.

The only caller that does not have to die is write-tree, because
updating the index for the cache-tree part is optional and not
being able to do so does not affect the correctness.  I think we
do not have to be so careful and make the failure into die() the
same way as other callers, but that would be a different patch.

Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-08-12 17:08:25 -07:00

295 lines
7.1 KiB
C

/*
* "git mv" builtin command
*
* Copyright (C) 2006 Johannes Schindelin
*/
#include <fnmatch.h>
#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)
{
const char **result = xmalloc((count + 1) * sizeof(const char *));
memcpy(result, pathspec, count * sizeof(const char *));
result[count] = NULL;
if (base_name) {
int i;
for (i = 0; i < count; i++) {
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 (!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 *bad = NULL;
if (show_only)
printf("Checking rename of '%s' to '%s'\n",
source[i], destination[i]);
if (lstat(source[i], &st) < 0)
bad = "bad source";
if (S_ISDIR(st.st_mode)) {
const char *dir = source[i], *dest_dir = destination[i];
int first, last, len = strlen(dir);
if (lstat(dest_dir, &st) == 0) {
bad = "cannot move directory over file";
goto next;
}
modes[i] = WORKING_DIRECTORY;
first = cache_name_pos(source[i], len);
if (first >= 0)
die ("Huh? %s/ is in index?", dir);
first = -1 - first;
for (last = first; last < active_nr; last++) {
const char *path = active_cache[last]->name;
if (strncmp(path, dir, len) || path[len] != '/')
break;
}
if (last - first < 1)
bad = "source directory is empty";
else if (!bad) {
int j, dst_len = strlen(dest_dir);
if (last - first > 0) {
source = realloc(source,
(count + last - first)
* sizeof(char *));
destination = realloc(destination,
(count + last - first)
* sizeof(char *));
modes = realloc(modes,
(count + last - first)
* sizeof(enum update_mode));
}
dest_dir = add_slash(dest_dir);
for (j = 0; j < last - first; j++) {
const char *path =
active_cache[first + j]->name;
source[count + j] = path;
destination[count + j] =
prefix_path(dest_dir, dst_len,
path + len);
modes[count + j] = INDEX;
}
count += last - first;
}
goto next;
}
if (!bad && lstat(destination[i], &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(destination[i],
&overwritten);
} else
bad = "Cannot overwrite";
}
}
if (!bad &&
!strncmp(destination[i], source[i], strlen(source[i])))
bad = "can not move directory into itself";
if (!bad && cache_name_pos(source[i], strlen(source[i])) < 0)
bad = "not under version control";
if (!bad) {
if (path_list_has_path(&src_for_dst, destination[i]))
bad = "multiple sources for the same target";
else
path_list_insert(destination[i], &src_for_dst);
}
next:
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, source[i], destination[i]);
}
}
for (i = 0; i < count; i++) {
if (show_only || verbose)
printf("Renaming %s to %s\n",
source[i], destination[i]);
if (!show_only && modes[i] != INDEX &&
rename(source[i], destination[i]) < 0 &&
!ignore_errors)
die ("renaming %s failed: %s",
source[i], strerror(errno));
if (modes[i] == WORKING_DIRECTORY)
continue;
if (cache_name_pos(source[i], strlen(source[i])) >= 0) {
path_list_insert(source[i], &deleted);
/* destination can be a directory with 1 file inside */
if (path_list_has_path(&overwritten, destination[i]))
path_list_insert(destination[i], &changed);
else
path_list_insert(destination[i], &added);
} else
path_list_insert(destination[i], &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 i = cache_name_pos(path, strlen(path));
struct cache_entry *ce = active_cache[i];
if (i < 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);
}
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;
}