git/builtin-mv.c
Junio C Hamano d089ebaad5 setup: sanitize absolute and funny paths in get_pathspec()
The prefix_path() function called from get_pathspec() is
responsible for translating list of user-supplied pathspecs to
list of pathspecs that is relative to the root of the work
tree.  When working inside a subdirectory, the user-supplied
pathspecs are taken to be relative to the current subdirectory.

Among special path components in pathspecs, we used to accept
and interpret only "." ("the directory", meaning a no-op) and
".."  ("up one level") at the beginning.  Everything else was
passed through as-is.

For example, if you are in Documentation/ directory of the
project, you can name Documentation/howto/maintain-git.txt as:

    howto/maintain-git.txt
    ../Documentation/howto/maitain-git.txt
    ../././Documentation/howto/maitain-git.txt

but not as:

    howto/./maintain-git.txt
    $(pwd)/howto/maintain-git.txt

This patch updates prefix_path() in several ways:

 - If the pathspec is not absolute, prefix (i.e. the current
   subdirectory relative to the root of the work tree, with
   terminating slash, if not empty) and the pathspec is
   concatenated first and used in the next step.  Otherwise,
   that absolute pathspec is used in the next step.

 - Then special path components "." (no-op) and ".." (up one
   level) are interpreted to simplify the path.  It is an error
   to have too many ".." to cause the intermediate result to
   step outside of the input to this step.

 - If the original pathspec was not absolute, the result from
   the previous step is the resulting "sanitized" pathspec.
   Otherwise, the result from the previous step is still
   absolute, and it is an error if it does not begin with the
   directory that corresponds to the root of the work tree.  The
   directory is stripped away from the result and is returned.

 - In any case, the resulting pathspec in the array
   get_pathspec() returns omit the ones that caused errors.

With this patch, the last two examples also behave as expected.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-05 00:44:10 -08:00

274 lines
7.2 KiB
C

/*
* "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"
#include "parse-options.h"
static const char * const builtin_mv_usage[] = {
"git-mv [options] <source>... <destination>",
NULL
};
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] == '/') {
result[i] = xmemdupz(result[i], length - 1);
}
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;
int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
struct option builtin_mv_options[] = {
OPT__DRY_RUN(&show_only),
OPT_BOOLEAN('f', NULL, &force, "force move/rename even if target exists"),
OPT_BOOLEAN('k', NULL, &ignore_errors, "skip move/rename errors"),
OPT_END(),
};
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_locked_index(&lock_file, 1);
if (read_cache() < 0)
die("index file corrupt");
argc = parse_options(argc, argv, builtin_mv_options, builtin_mv_usage, 0);
if (--argc < 1)
usage_with_options(builtin_mv_usage, builtin_mv_options);
source = copy_pathspec(prefix, argv, argc, 0);
modes = xcalloc(argc, sizeof(enum update_mode));
dest_path = copy_pathspec(prefix, argv + argc, 1, 0);
if (dest_path[0][0] == '\0')
/* special case: "." was normalized to "" */
destination = copy_pathspec(dest_path[0], argv, argc, 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, argc, 1);
} else {
if (argc != 1)
usage_with_options(builtin_mv_usage, builtin_mv_options);
destination = dest_path;
}
/* Checking */
for (i = 0; i < argc; 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,
(argc + last - first)
* sizeof(char *));
destination = xrealloc(destination,
(argc + last - first)
* sizeof(char *));
modes = xrealloc(modes,
(argc + last - first)
* sizeof(enum update_mode));
}
dst = add_slash(dst);
dst_len = strlen(dst);
for (j = 0; j < last - first; j++) {
const char *path =
active_cache[first + j]->name;
source[argc + j] = path;
destination[argc + j] =
prefix_path(dst, dst_len,
path + length + 1);
modes[argc + j] = INDEX;
}
argc += 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 (--argc > 0) {
memmove(source + i, source + i + 1,
(argc - i) * sizeof(char *));
memmove(destination + i,
destination + i + 1,
(argc - i) * sizeof(char *));
}
} else
die ("%s, source=%s, destination=%s",
bad, src, dst);
}
}
for (i = 0; i < argc; 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_cache(path, verbose);
}
for (i = 0; i < deleted.nr; i++)
remove_file_from_cache(deleted.items[i].path);
if (active_cache_changed) {
if (write_cache(newfd, active_cache, active_nr) ||
commit_locked_index(&lock_file))
die("Unable to write new index file");
}
}
return 0;
}