Martin Erik Werner <martinerikwerner@xxxxxxxxx> writes:
> In order to manipulate symliks in the
> work tree using absolute paths, symlinks should only be dereferenced
> outside the work tree.
I agree 100% with this reasoning (modulo s/symliks/symlinks/).
As to the implementation, it looks a bit overly complicated,
though. I haven't tried writing the same myself, but
* I suspect that strbuf would help simplifying the allocation and
deallocation;
* Also I suspect that use of string-list to split and then join is
making the code unnecessarily complex. In Python/Perl, that would
be a normal approach, but in C, it would be a lot simpler if you
prepare a writable temporary in wtpart[], walk from left to right
finding '/' and replacing it temporarily with NUL to terminate in
order to check with real_path(), restore the NUL back to '/' to
check deeper, and rinse and repeat.
Having said that, I am not absolutely sure if the repeated
calls to real_path() are doing the right thing, though ;-)
> diff --git a/setup.c b/setup.c
> index 5432a31..0789a96 100644
> --- a/setup.c
> +++ b/setup.c
> @@ -22,11 +22,51 @@ char *prefix_path_gently(const char *prefix, int len,
> const char *orig = path;
> char *sanitized;
> if (is_absolute_path(orig)) {
> - const char *temp = real_path(path);
> - sanitized = xmalloc(len + strlen(temp) + 1);
> - strcpy(sanitized, temp);
> + int i, match;
> + size_t wtpartlen;
> + char *npath, *wtpart;
> + struct string_list list = STRING_LIST_INIT_DUP;
> + const char *work_tree = get_git_work_tree();
> + if (!work_tree)
> + return NULL;
> + npath = xmalloc(strlen(path) + 1);
> if (remaining_prefix)
> *remaining_prefix = 0;
> + if (normalize_path_copy_len(npath, path, remaining_prefix)) {
> + free(npath);
> + return NULL;
> + }
> +
> + string_list_split(&list, npath, '/', -1);
> + wtpart = xmalloc(strlen(npath) + 1);
> + i = 0;
> + match = 0;
> + strcpy(wtpart, list.items[i++].string);
> + strcat(wtpart, "/");
> + if (strcmp(real_path(wtpart), work_tree) == 0) {
> + match = 1;
> + } else {
> + while (i < list.nr) {
> + strcat(wtpart, list.items[i++].string);
> + if (strcmp(real_path(wtpart), work_tree) == 0) {
> + match = 1;
> + break;
> + }
> + strcat(wtpart, "/");
> + }
> + }
> + string_list_clear(&list, 0);
> + if (!match) {
> + free(npath);
> + free(wtpart);
> + return NULL;
> + }
> +
> + wtpartlen = strlen(wtpart);
> + sanitized = xmalloc(strlen(npath) - wtpartlen);
> + strcpy(sanitized, npath + wtpartlen + 1);
> + free(npath);
> + free(wtpart);
> } else {
> sanitized = xmalloc(len + strlen(path) + 1);
> if (len)
> @@ -34,26 +74,10 @@ char *prefix_path_gently(const char *prefix, int len,
> strcpy(sanitized + len, path);
> if (remaining_prefix)
> *remaining_prefix = len;
> - }
> - if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix))
> - goto error_out;
> - if (is_absolute_path(orig)) {
> - size_t root_len, len, total;
> - const char *work_tree = get_git_work_tree();
> - if (!work_tree)
> - goto error_out;
> - len = strlen(work_tree);
> - root_len = offset_1st_component(work_tree);
> - total = strlen(sanitized) + 1;
> - if (strncmp(sanitized, work_tree, len) ||
> - (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
> - error_out:
> + if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
> free(sanitized);
> return NULL;
> }
> - if (sanitized[len] == '/')
> - len++;
> - memmove(sanitized, sanitized + len, total - len);
> }
> return sanitized;
> }
> diff --git a/t/t0060-path-utils.sh b/t/t0060-path-utils.sh
> index 3a0677a..03a12ac 100755
> --- a/t/t0060-path-utils.sh
> +++ b/t/t0060-path-utils.sh
> @@ -190,7 +190,7 @@ test_expect_success SYMLINKS 'real path works on symlinks' '
> test "$sym" = "$(test-path-utils real_path "$dir2/syml")"
> '
>
> -test_expect_failure SYMLINKS 'prefix_path works with work tree symlinks' '
> +test_expect_success SYMLINKS 'prefix_path works with work tree symlinks' '
>
> ln -s target symlink &&
> test "$(test-path-utils prefix_path prefix "$(pwd)/symlink")" = "symlink"
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