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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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5
Documentation/git.txt
View file

@ -724,13 +724,12 @@ for further details.
waiting for someone with sufficient permissions to fix it.
`GIT_FLUSH`::
// NEEDSWORK: make it into a usual Boolean environment variable
If this environment variable is set to "1", then commands such
If this Boolean environment variable is set to true, then commands such
as 'git blame' (in incremental mode), 'git rev-list', 'git log',
'git check-attr' and 'git check-ignore' will
force a flush of the output stream after each record have been
flushed. If this
variable is set to "0", the output of these commands will be done
variable is set to false, the output of these commands will be done
using completely buffered I/O. If this environment variable is
not set, Git will choose buffered or record-oriented flushing
based on whether stdout appears to be redirected to a file or not.

19
write-or-die.c
View file

@ -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;