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write-or-die: make GIT_FLUSH a Boolean environment variable

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Among Git's environment variables, the ones marked as "Boolean"
accept values in a way similar to Boolean configuration variables,
i.e. values like 'yes', 'on', 'true' and positive numbers are
taken as "on" and values like 'no', 'off', 'false' are taken as
"off".

GIT_FLUSH can be used to force Git to use non-buffered I/O when
writing to stdout. It can only accept two values, '1' which causes
Git to flush more often and '0' which makes all output buffered.
Make GIT_FLUSH accept more values besides '0' and '1' by turning it
into a Boolean environment variable, modifying the required logic.
Update the related documentation.

Signed-off-by: Chandra Pratap <chandrapratap3519@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Chandra Pratap
2024-01-04 10:20:17 +00:00
committed by Junio C Hamano
parent 564d0252ca
commit 556e68032f
2 changed files with 10 additions and 14 deletions
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19
write-or-die.c
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@ -19,20 +19,17 @@
void maybe_flush_or_die(FILE *f, const char *desc)
{
static int skip_stdout_flush = -1;
struct stat st;
char *cp;
if (f == stdout) {
if (skip_stdout_flush < 0) {
/* NEEDSWORK: make this a normal Boolean */
cp = getenv("GIT_FLUSH");
if (cp)
skip_stdout_flush = (atoi(cp) == 0);
else if ((fstat(fileno(stdout), &st) == 0) &&
S_ISREG(st.st_mode))
skip_stdout_flush = 1;
else
skip_stdout_flush = 0;
skip_stdout_flush = git_env_bool("GIT_FLUSH", -1);
if (skip_stdout_flush < 0) {
struct stat st;
if (fstat(fileno(stdout), &st))
skip_stdout_flush = 0;
else
skip_stdout_flush = S_ISREG(st.st_mode);
}
}
if (skip_stdout_flush && !ferror(f))
return;