mirror of
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50a6c8efa2
If our size computation overflows size_t, we may allocate a much smaller buffer than we expected and overflow it. It's probably impossible to trigger an overflow in most of these sites in practice, but it is easy enough convert their additions and multiplications into overflow-checking variants. This may be fixing real bugs, and it makes auditing the code easier. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
284 lines
8.0 KiB
C
284 lines
8.0 KiB
C
/*
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* "git mv" builtin command
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*
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* Copyright (C) 2006 Johannes Schindelin
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*/
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#include "builtin.h"
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#include "lockfile.h"
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#include "dir.h"
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#include "cache-tree.h"
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#include "string-list.h"
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#include "parse-options.h"
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#include "submodule.h"
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static const char * const builtin_mv_usage[] = {
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N_("git mv [<options>] <source>... <destination>"),
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NULL
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};
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#define DUP_BASENAME 1
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#define KEEP_TRAILING_SLASH 2
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static const char **internal_copy_pathspec(const char *prefix,
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const char **pathspec,
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int count, unsigned flags)
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{
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int i;
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const char **result;
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ALLOC_ARRAY(result, count + 1);
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memcpy(result, pathspec, count * sizeof(const char *));
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result[count] = NULL;
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for (i = 0; i < count; i++) {
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int length = strlen(result[i]);
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int to_copy = length;
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while (!(flags & KEEP_TRAILING_SLASH) &&
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to_copy > 0 && is_dir_sep(result[i][to_copy - 1]))
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to_copy--;
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if (to_copy != length || flags & DUP_BASENAME) {
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char *it = xmemdupz(result[i], to_copy);
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if (flags & DUP_BASENAME) {
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result[i] = xstrdup(basename(it));
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free(it);
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} else
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result[i] = it;
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}
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}
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return get_pathspec(prefix, result);
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}
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static const char *add_slash(const char *path)
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{
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size_t len = strlen(path);
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if (path[len - 1] != '/') {
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char *with_slash = xmalloc(st_add(len, 2));
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memcpy(with_slash, path, len);
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with_slash[len++] = '/';
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with_slash[len] = 0;
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return with_slash;
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}
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return path;
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}
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static struct lock_file lock_file;
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#define SUBMODULE_WITH_GITDIR ((const char *)1)
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static void prepare_move_submodule(const char *src, int first,
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const char **submodule_gitfile)
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{
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struct strbuf submodule_dotgit = STRBUF_INIT;
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if (!S_ISGITLINK(active_cache[first]->ce_mode))
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die(_("Directory %s is in index and no submodule?"), src);
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if (!is_staging_gitmodules_ok())
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die(_("Please stage your changes to .gitmodules or stash them to proceed"));
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strbuf_addf(&submodule_dotgit, "%s/.git", src);
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*submodule_gitfile = read_gitfile(submodule_dotgit.buf);
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if (*submodule_gitfile)
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*submodule_gitfile = xstrdup(*submodule_gitfile);
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else
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*submodule_gitfile = SUBMODULE_WITH_GITDIR;
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strbuf_release(&submodule_dotgit);
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}
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static int index_range_of_same_dir(const char *src, int length,
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int *first_p, int *last_p)
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{
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const char *src_w_slash = add_slash(src);
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int first, last, len_w_slash = length + 1;
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first = cache_name_pos(src_w_slash, len_w_slash);
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if (first >= 0)
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die(_("%.*s is in index"), len_w_slash, src_w_slash);
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first = -1 - first;
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for (last = first; last < active_nr; last++) {
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const char *path = active_cache[last]->name;
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if (strncmp(path, src_w_slash, len_w_slash))
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break;
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}
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if (src_w_slash != src)
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free((char *)src_w_slash);
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*first_p = first;
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*last_p = last;
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return last - first;
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}
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int cmd_mv(int argc, const char **argv, const char *prefix)
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{
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int i, gitmodules_modified = 0;
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int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
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struct option builtin_mv_options[] = {
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OPT__VERBOSE(&verbose, N_("be verbose")),
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OPT__DRY_RUN(&show_only, N_("dry run")),
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OPT__FORCE(&force, N_("force move/rename even if target exists")),
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OPT_BOOL('k', NULL, &ignore_errors, N_("skip move/rename errors")),
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OPT_END(),
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};
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const char **source, **destination, **dest_path, **submodule_gitfile;
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enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
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struct stat st;
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struct string_list src_for_dst = STRING_LIST_INIT_NODUP;
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gitmodules_config();
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, prefix, builtin_mv_options,
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builtin_mv_usage, 0);
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if (--argc < 1)
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usage_with_options(builtin_mv_usage, builtin_mv_options);
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hold_locked_index(&lock_file, 1);
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if (read_cache() < 0)
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die(_("index file corrupt"));
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source = internal_copy_pathspec(prefix, argv, argc, 0);
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modes = xcalloc(argc, sizeof(enum update_mode));
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/*
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* Keep trailing slash, needed to let
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* "git mv file no-such-dir/" error out.
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*/
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dest_path = internal_copy_pathspec(prefix, argv + argc, 1,
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KEEP_TRAILING_SLASH);
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submodule_gitfile = xcalloc(argc, sizeof(char *));
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if (dest_path[0][0] == '\0')
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/* special case: "." was normalized to "" */
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destination = internal_copy_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
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else if (!lstat(dest_path[0], &st) &&
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S_ISDIR(st.st_mode)) {
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dest_path[0] = add_slash(dest_path[0]);
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destination = internal_copy_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
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} else {
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if (argc != 1)
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die(_("destination '%s' is not a directory"), dest_path[0]);
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destination = dest_path;
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}
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/* Checking */
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for (i = 0; i < argc; i++) {
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const char *src = source[i], *dst = destination[i];
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int length, src_is_dir;
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const char *bad = NULL;
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if (show_only)
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printf(_("Checking rename of '%s' to '%s'\n"), src, dst);
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length = strlen(src);
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if (lstat(src, &st) < 0)
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bad = _("bad source");
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else if (!strncmp(src, dst, length) &&
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(dst[length] == 0 || dst[length] == '/')) {
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bad = _("can not move directory into itself");
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} else if ((src_is_dir = S_ISDIR(st.st_mode))
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&& lstat(dst, &st) == 0)
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bad = _("cannot move directory over file");
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else if (src_is_dir) {
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int first = cache_name_pos(src, length), last;
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if (first >= 0)
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prepare_move_submodule(src, first,
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submodule_gitfile + i);
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else if (index_range_of_same_dir(src, length,
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&first, &last) < 1)
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bad = _("source directory is empty");
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else { /* last - first >= 1 */
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int j, dst_len, n;
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modes[i] = WORKING_DIRECTORY;
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n = argc + last - first;
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REALLOC_ARRAY(source, n);
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REALLOC_ARRAY(destination, n);
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REALLOC_ARRAY(modes, n);
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REALLOC_ARRAY(submodule_gitfile, n);
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dst = add_slash(dst);
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dst_len = strlen(dst);
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for (j = 0; j < last - first; j++) {
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const char *path = active_cache[first + j]->name;
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source[argc + j] = path;
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destination[argc + j] =
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prefix_path(dst, dst_len, path + length + 1);
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modes[argc + j] = INDEX;
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submodule_gitfile[argc + j] = NULL;
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}
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argc += last - first;
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}
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} else if (cache_name_pos(src, length) < 0)
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bad = _("not under version control");
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else if (lstat(dst, &st) == 0 &&
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(!ignore_case || strcasecmp(src, dst))) {
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bad = _("destination exists");
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if (force) {
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/*
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* only files can overwrite each other:
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* check both source and destination
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*/
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if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
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if (verbose)
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warning(_("overwriting '%s'"), dst);
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bad = NULL;
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} else
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bad = _("Cannot overwrite");
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}
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} else if (string_list_has_string(&src_for_dst, dst))
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bad = _("multiple sources for the same target");
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else if (is_dir_sep(dst[strlen(dst) - 1]))
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bad = _("destination directory does not exist");
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else
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string_list_insert(&src_for_dst, dst);
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if (!bad)
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continue;
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if (!ignore_errors)
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die(_("%s, source=%s, destination=%s"),
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bad, src, dst);
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if (--argc > 0) {
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int n = argc - i;
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memmove(source + i, source + i + 1,
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n * sizeof(char *));
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memmove(destination + i, destination + i + 1,
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n * sizeof(char *));
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memmove(modes + i, modes + i + 1,
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n * sizeof(enum update_mode));
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memmove(submodule_gitfile + i, submodule_gitfile + i + 1,
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n * sizeof(char *));
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i--;
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}
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}
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for (i = 0; i < argc; i++) {
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const char *src = source[i], *dst = destination[i];
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enum update_mode mode = modes[i];
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int pos;
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if (show_only || verbose)
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printf(_("Renaming %s to %s\n"), src, dst);
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if (!show_only && mode != INDEX) {
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if (rename(src, dst) < 0 && !ignore_errors)
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die_errno(_("renaming '%s' failed"), src);
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if (submodule_gitfile[i]) {
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if (submodule_gitfile[i] != SUBMODULE_WITH_GITDIR)
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connect_work_tree_and_git_dir(dst, submodule_gitfile[i]);
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if (!update_path_in_gitmodules(src, dst))
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gitmodules_modified = 1;
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}
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}
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if (mode == WORKING_DIRECTORY)
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continue;
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pos = cache_name_pos(src, strlen(src));
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assert(pos >= 0);
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if (!show_only)
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rename_cache_entry_at(pos, dst);
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}
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if (gitmodules_modified)
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stage_updated_gitmodules();
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if (active_cache_changed &&
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write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
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die(_("Unable to write new index file"));
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return 0;
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}
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