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builtin/bugreport.c: use thread-safe localtime_r()

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To generate its filename, the 'git bugreport' builtin asks the system
for the current time with 'localtime()'. Since this uses a shared
buffer, it is not thread-safe.

Even though 'git bugreport' is not multi-threaded, using localtime() can
trigger some static analysis tools to complain, and a quick

    $ git grep -oh 'localtime\(_.\)\?' -- **/*.c | sort | uniq -c

shows that the only usage of the thread-unsafe 'localtime' is in a piece
of documentation.

So, convert this instance to use the thread-safe version for
consistency, and to appease some analysis tools.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2020-11-30 19:30:06 -05:00 committed by Junio C Hamano
parent 72ffeb997e
commit 4f6460df55
1 changed files with 2 additions and 1 deletions
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builtin/bugreport.c
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@ -125,6 +125,7 @@ int cmd_bugreport(int argc, const char **argv, const char *prefix)
struct strbuf report_path = STRBUF_INIT;
int report = -1;
time_t now = time(NULL);
struct tm tm;
char *option_output = NULL;
char *option_suffix = "%Y-%m-%d-%H%M";
const char *user_relative_path = NULL;
@ -147,7 +148,7 @@ int cmd_bugreport(int argc, const char **argv, const char *prefix)
strbuf_complete(&report_path, '/');
strbuf_addstr(&report_path, "git-bugreport-");
strbuf_addftime(&report_path, option_suffix, localtime(&now), 0, 0);
strbuf_addftime(&report_path, option_suffix, localtime_r(&now, &tm), 0, 0);
strbuf_addstr(&report_path, ".txt");
switch (safe_create_leading_directories(report_path.buf)) {