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556e68032f
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>
110 lines
2.3 KiB
C
110 lines
2.3 KiB
C
#include "git-compat-util.h"
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#include "parse.h"
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#include "run-command.h"
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#include "write-or-die.h"
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/*
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* Some cases use stdio, but want to flush after the write
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* to get error handling (and to get better interactive
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* behaviour - not buffering excessively).
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*
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* Of course, if the flush happened within the write itself,
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* we've already lost the error code, and cannot report it any
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* more. So we just ignore that case instead (and hope we get
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* the right error code on the flush).
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*
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* If the file handle is stdout, and stdout is a file, then skip the
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* flush entirely since it's not needed.
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*/
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void maybe_flush_or_die(FILE *f, const char *desc)
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{
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static int skip_stdout_flush = -1;
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if (f == stdout) {
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if (skip_stdout_flush < 0) {
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skip_stdout_flush = git_env_bool("GIT_FLUSH", -1);
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if (skip_stdout_flush < 0) {
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struct stat st;
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if (fstat(fileno(stdout), &st))
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skip_stdout_flush = 0;
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else
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skip_stdout_flush = S_ISREG(st.st_mode);
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}
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}
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if (skip_stdout_flush && !ferror(f))
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return;
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}
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if (fflush(f)) {
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check_pipe(errno);
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die_errno("write failure on '%s'", desc);
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}
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}
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void fprintf_or_die(FILE *f, const char *fmt, ...)
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{
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va_list ap;
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int ret;
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va_start(ap, fmt);
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ret = vfprintf(f, fmt, ap);
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va_end(ap);
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if (ret < 0) {
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check_pipe(errno);
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die_errno("write error");
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}
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}
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static int maybe_fsync(int fd)
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{
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if (use_fsync < 0)
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use_fsync = git_env_bool("GIT_TEST_FSYNC", 1);
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if (!use_fsync)
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return 0;
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if (fsync_method == FSYNC_METHOD_WRITEOUT_ONLY &&
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git_fsync(fd, FSYNC_WRITEOUT_ONLY) >= 0)
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return 0;
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return git_fsync(fd, FSYNC_HARDWARE_FLUSH);
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}
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void fsync_or_die(int fd, const char *msg)
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{
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if (maybe_fsync(fd) < 0)
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die_errno("fsync error on '%s'", msg);
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}
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int fsync_component(enum fsync_component component, int fd)
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{
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if (fsync_components & component)
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return maybe_fsync(fd);
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return 0;
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}
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void fsync_component_or_die(enum fsync_component component, int fd, const char *msg)
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{
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if (fsync_components & component)
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fsync_or_die(fd, msg);
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}
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void write_or_die(int fd, const void *buf, size_t count)
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{
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if (write_in_full(fd, buf, count) < 0) {
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check_pipe(errno);
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die_errno("write error");
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}
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}
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void fwrite_or_die(FILE *f, const void *buf, size_t count)
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{
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if (fwrite(buf, 1, count, f) != count)
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die_errno("fwrite error");
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}
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void fflush_or_die(FILE *f)
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{
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if (fflush(f))
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die_errno("fflush error");
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}
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