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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date.h
#ifndef DATE_H
#define DATE_H
/**
* The date mode type. This has DATE_NORMAL at an explicit "= 0" to
* accommodate a memset([...], 0, [...]) initialization when "struct
* date_mode" is used as an embedded struct member, as in the case of
* e.g. "struct pretty_print_context" and "struct rev_info".
*/
enum date_mode_type {
DATE_NORMAL = 0,
DATE_HUMAN,
DATE_RELATIVE,
DATE_SHORT,
DATE_ISO8601,
DATE_ISO8601_STRICT,
DATE_RFC2822,
DATE_STRFTIME,
DATE_RAW,
DATE_UNIX
};
struct date_mode {
enum date_mode_type type;
const char *strftime_fmt;
int local;
};
#define DATE_MODE_INIT { \
.type = DATE_NORMAL, \
}
/**
* Convenience helper for passing a constant type, like:
*
* show_date(t, tz, DATE_MODE(NORMAL));
*/
#define DATE_MODE(t) date_mode_from_type(DATE_##t)
struct date_mode *date_mode_from_type(enum date_mode_type type);
/**
* Format <'time', 'timezone'> into static memory according to 'mode'
* and return it. The mode is an initialized "struct date_mode"
* (usually from the DATE_MODE() macro).
*/
const char *show_date(timestamp_t time, int timezone, const struct date_mode *mode);
/**
* Parse a date format for later use with show_date().
*
* When the "date_mode_type" is DATE_STRFTIME the "strftime_fmt"
* member of "struct date_mode" will be a malloc()'d format string to
* be used with strbuf_addftime(), in which case you'll need to call
* date_mode_release() later.
*/
void parse_date_format(const char *format, struct date_mode *mode);
/**
* Release a "struct date_mode", currently only required if
* parse_date_format() has parsed a "DATE_STRFTIME" format.
*/
void date_mode_release(struct date_mode *mode);
void show_date_relative(timestamp_t time, struct strbuf *timebuf);
int parse_date(const char *date, struct strbuf *out);
int parse_date_basic(const char *date, timestamp_t *timestamp, int *offset);
int parse_expiry_date(const char *date, timestamp_t *timestamp);
void datestamp(struct strbuf *out);
#define approxidate(s) approxidate_careful((s), NULL)
timestamp_t approxidate_careful(const char *, int *);
timestamp_t approxidate_relative(const char *date);
int date_overflows(timestamp_t date);
time_t tm_to_time_t(const struct tm *tm);
#endif
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