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>
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bundle.h
#ifndef BUNDLE_H
#define BUNDLE_H
#include "strvec.h"
#include "cache.h"
#include "string-list.h"
#include "list-objects-filter-options.h"
struct bundle_header {
unsigned version;
struct string_list prerequisites;
struct string_list references;
const struct git_hash_algo *hash_algo;
struct list_objects_filter_options filter;
};
#define BUNDLE_HEADER_INIT \
{ \
.prerequisites = STRING_LIST_INIT_DUP, \
.references = STRING_LIST_INIT_DUP, \
.filter = LIST_OBJECTS_FILTER_INIT, \
}
void bundle_header_init(struct bundle_header *header);
void bundle_header_release(struct bundle_header *header);
int is_bundle(const char *path, int quiet);
int read_bundle_header(const char *path, struct bundle_header *header);
int read_bundle_header_fd(int fd, struct bundle_header *header,
const char *report_path);
int create_bundle(struct repository *r, const char *path,
int argc, const char **argv, struct strvec *pack_options,
int version);
enum verify_bundle_flags {
VERIFY_BUNDLE_VERBOSE = (1 << 0),
VERIFY_BUNDLE_QUIET = (1 << 1),
};
int verify_bundle(struct repository *r, struct bundle_header *header,
enum verify_bundle_flags flags);
/**
* Unbundle after reading the header with read_bundle_header().
*
* We'll invoke "git index-pack --stdin --fix-thin" for you on the
* provided `bundle_fd` from read_bundle_header().
*
* Provide "extra_index_pack_args" to pass any extra arguments
* (e.g. "-v" for verbose/progress), NULL otherwise. The provided
* "extra_index_pack_args" (if any) will be strvec_clear()'d for you.
*
* Before unbundling, this method will call verify_bundle() with the
* given 'flags'.
*/
int unbundle(struct repository *r, struct bundle_header *header,
int bundle_fd, struct strvec *extra_index_pack_args,
enum verify_bundle_flags flags);
int list_bundle_refs(struct bundle_header *header,
int argc, const char **argv);
#endif
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