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write-or-die: fix the polarity of GIT_FLUSH environment variable 

When GIT_FLUSH is set to 1, true, on, yes, then we should disable
skip_stdout_flush, but the conversion somehow did the opposite.

With the understanding of the original motivation behind "skip" in
06f59e9f (Don't fflush(stdout) when it's not helpful, 2007-06-29),
we can sympathize with the current naming (we wanted to avoid
useless flushing of stdout by default, with an escape hatch to
always flush), but it is still not a good excuse.

Retire the "skip_stdout_flush" variable and replace it with "flush_stdout"
that tells if we do or do not want to run fflush().

Reported-by: Xiaoguang WANG <wxiaoguang@gmail.com>
Helped-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2024-02-13 11:48:15 -08:00
parent 556e68032f
commit b40ba17e44
1 changed files with 8 additions and 8 deletions
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16
write-or-die.c
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@ -18,20 +18,20 @@
*/
void maybe_flush_or_die(FILE *f, const char *desc)
{
static int skip_stdout_flush = -1;
if (f == stdout) {
if (skip_stdout_flush < 0) {
skip_stdout_flush = git_env_bool("GIT_FLUSH", -1);
if (skip_stdout_flush < 0) {
static int force_flush_stdout = -1;
if (force_flush_stdout < 0) {
force_flush_stdout = git_env_bool("GIT_FLUSH", -1);
if (force_flush_stdout < 0) {
struct stat st;
if (fstat(fileno(stdout), &st))
skip_stdout_flush = 0;
force_flush_stdout = 1;
else
skip_stdout_flush = S_ISREG(st.st_mode);
force_flush_stdout = !S_ISREG(st.st_mode);
}
}
if (skip_stdout_flush && !ferror(f))
if (!force_flush_stdout && !ferror(f))
return;
}
if (fflush(f)) {