Revision 9cf85473209ea8ae2b56c13145c4704d12ee1374 authored by Filip Hejsek on 28 January 2024, 04:09:17 UTC, committed by Johannes Schindelin on 17 April 2024, 20:30:01 UTC
While it is expected to have several git dirs within the `.git/modules/` tree, it is important that they do not interfere with each other. For example, if one submodule was called "captain" and another submodule "captain/hooks", their respective git dirs would clash, as they would be located in `.git/modules/captain/` and `.git/modules/captain/hooks/`, respectively, i.e. the latter's files could clash with the actual Git hooks of the former. To prevent these clashes, and in particular to prevent hooks from being written and then executed as part of a recursive clone, we introduced checks as part of the fix for CVE-2019-1387 in a8dee3ca61 (Disallow dubiously-nested submodule git directories, 2019-10-01). It is currently possible to bypass the check for clashing submodule git dirs in two ways: 1. parallel cloning 2. checkout --recurse-submodules Let's check not only before, but also after parallel cloning (and before checking out the submodule), that the git dir is not clashing with another one, otherwise fail. This addresses the parallel cloning issue. As to the parallel checkout issue: It requires quite a few manual steps to create clashing git dirs because Git itself would refuse to initialize the inner one, as demonstrated by the test case. Nevertheless, let's teach the recursive checkout (namely, the `submodule_move_head()` function that is used by the recursive checkout) to be careful to verify that it does not use a clashing git dir, and if it does, disable it (by deleting the `HEAD` file so that subsequent Git calls won't recognize it as a git dir anymore). Note: The parallel cloning test case contains a `cat err` that proved to be highly useful when analyzing the racy nature of the operation (the operation can fail with three different error messages, depending on timing), and was left on purpose to ease future debugging should the need arise. Signed-off-by: Filip Hejsek <filip.hejsek@gmail.com> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
1 parent b20c10f
check-ignore.c
#define USE_THE_INDEX_VARIABLE
#include "builtin.h"
#include "cache.h"
#include "config.h"
#include "dir.h"
#include "quote.h"
#include "pathspec.h"
#include "parse-options.h"
#include "submodule.h"
static int quiet, verbose, stdin_paths, show_non_matching, no_index;
static const char * const check_ignore_usage[] = {
"git check-ignore [<options>] <pathname>...",
"git check-ignore [<options>] --stdin",
NULL
};
static int nul_term_line;
static const struct option check_ignore_options[] = {
OPT__QUIET(&quiet, N_("suppress progress reporting")),
OPT__VERBOSE(&verbose, N_("be verbose")),
OPT_GROUP(""),
OPT_BOOL(0, "stdin", &stdin_paths,
N_("read file names from stdin")),
OPT_BOOL('z', NULL, &nul_term_line,
N_("terminate input and output records by a NUL character")),
OPT_BOOL('n', "non-matching", &show_non_matching,
N_("show non-matching input paths")),
OPT_BOOL(0, "no-index", &no_index,
N_("ignore index when checking")),
OPT_END()
};
static void output_pattern(const char *path, struct path_pattern *pattern)
{
char *bang = (pattern && pattern->flags & PATTERN_FLAG_NEGATIVE) ? "!" : "";
char *slash = (pattern && pattern->flags & PATTERN_FLAG_MUSTBEDIR) ? "/" : "";
if (!nul_term_line) {
if (!verbose) {
write_name_quoted(path, stdout, '\n');
} else {
if (pattern) {
quote_c_style(pattern->pl->src, NULL, stdout, 0);
printf(":%d:%s%s%s\t",
pattern->srcpos,
bang, pattern->pattern, slash);
}
else {
printf("::\t");
}
quote_c_style(path, NULL, stdout, 0);
fputc('\n', stdout);
}
} else {
if (!verbose) {
printf("%s%c", path, '\0');
} else {
if (pattern)
printf("%s%c%d%c%s%s%s%c%s%c",
pattern->pl->src, '\0',
pattern->srcpos, '\0',
bang, pattern->pattern, slash, '\0',
path, '\0');
else
printf("%c%c%c%s%c", '\0', '\0', '\0', path, '\0');
}
}
}
static int check_ignore(struct dir_struct *dir,
const char *prefix, int argc, const char **argv)
{
const char *full_path;
char *seen;
int num_ignored = 0, i;
struct path_pattern *pattern;
struct pathspec pathspec;
if (!argc) {
if (!quiet)
fprintf(stderr, "no pathspec given.\n");
return 0;
}
/*
* check-ignore just needs paths. Magic beyond :/ is really
* irrelevant.
*/
parse_pathspec(&pathspec,
PATHSPEC_ALL_MAGIC & ~PATHSPEC_FROMTOP,
PATHSPEC_SYMLINK_LEADING_PATH |
PATHSPEC_KEEP_ORDER,
prefix, argv);
die_path_inside_submodule(&the_index, &pathspec);
/*
* look for pathspecs matching entries in the index, since these
* should not be ignored, in order to be consistent with
* 'git status', 'git add' etc.
*/
seen = find_pathspecs_matching_against_index(&pathspec, &the_index,
PS_HEED_SKIP_WORKTREE);
for (i = 0; i < pathspec.nr; i++) {
full_path = pathspec.items[i].match;
pattern = NULL;
if (!seen[i]) {
int dtype = DT_UNKNOWN;
pattern = last_matching_pattern(dir, &the_index,
full_path, &dtype);
if (!verbose && pattern &&
pattern->flags & PATTERN_FLAG_NEGATIVE)
pattern = NULL;
}
if (!quiet && (pattern || show_non_matching))
output_pattern(pathspec.items[i].original, pattern);
if (pattern)
num_ignored++;
}
free(seen);
clear_pathspec(&pathspec);
return num_ignored;
}
static int check_ignore_stdin_paths(struct dir_struct *dir, const char *prefix)
{
struct strbuf buf = STRBUF_INIT;
struct strbuf unquoted = STRBUF_INIT;
char *pathspec[2] = { NULL, NULL };
strbuf_getline_fn getline_fn;
int num_ignored = 0;
getline_fn = nul_term_line ? strbuf_getline_nul : strbuf_getline_lf;
while (getline_fn(&buf, stdin) != EOF) {
if (!nul_term_line && buf.buf[0] == '"') {
strbuf_reset(&unquoted);
if (unquote_c_style(&unquoted, buf.buf, NULL))
die("line is badly quoted");
strbuf_swap(&buf, &unquoted);
}
pathspec[0] = buf.buf;
num_ignored += check_ignore(dir, prefix,
1, (const char **)pathspec);
maybe_flush_or_die(stdout, "check-ignore to stdout");
}
strbuf_release(&buf);
strbuf_release(&unquoted);
return num_ignored;
}
int cmd_check_ignore(int argc, const char **argv, const char *prefix)
{
int num_ignored;
struct dir_struct dir = DIR_INIT;
git_config(git_default_config, NULL);
argc = parse_options(argc, argv, prefix, check_ignore_options,
check_ignore_usage, 0);
if (stdin_paths) {
if (argc > 0)
die(_("cannot specify pathnames with --stdin"));
} else {
if (nul_term_line)
die(_("-z only makes sense with --stdin"));
if (argc == 0)
die(_("no path specified"));
}
if (quiet) {
if (argc > 1)
die(_("--quiet is only valid with a single pathname"));
if (verbose)
die(_("cannot have both --quiet and --verbose"));
}
if (show_non_matching && !verbose)
die(_("--non-matching is only valid with --verbose"));
/* read_cache() is only necessary so we can watch out for submodules. */
if (!no_index && repo_read_index(the_repository) < 0)
die(_("index file corrupt"));
setup_standard_excludes(&dir);
if (stdin_paths) {
num_ignored = check_ignore_stdin_paths(&dir, prefix);
} else {
num_ignored = check_ignore(&dir, prefix, argc, argv);
maybe_flush_or_die(stdout, "ignore to stdout");
}
dir_clear(&dir);
return !num_ignored;
}
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...