https://github.com/git/git
Revision c972ec04204b6edf4fe7ec0d59a3ce3564378303 authored by Junio C Hamano on 20 July 2008, 02:22:25 UTC, committed by Junio C Hamano on 20 July 2008, 06:08:58 UTC
The implementation of "git add" has four major codepaths that are mutually exclusive: - if "--interactive" or "--patch" is given, spawn "git add--interactive" and exit without doing anything else. Otherwise things are handled internally in this C code; - if "--update" is given, update the modified files and exit without doing anything else; - if "--refresh" is given, do refresh and exit without doing anything else; - otherwise, find the paths that match pathspecs and stage their contents. It led to an unholy mess in the code structure; each of the latter three codepaths has a separate call to read_cache(), even though they are all about "read the current index, update it and write it back", and logically they should read the index once _anyway_. This cleans up the latter three cases by introducing a pair of helper variables: - "add_new_files" is set if we need to scan the working tree for paths that match the pathspec. This variable is false for "--update" and "--refresh", because they only work on already tracked files. - "require_pathspec" is set if the user must give at least one pathspec. "--update" does not need it but all the other cases do. This is in preparation for introducing a new option "--all", that does the equivalent of "git add -u && git add ." (aka "addremove"). Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent 09651dd
Tip revision: c972ec04204b6edf4fe7ec0d59a3ce3564378303 authored by Junio C Hamano on 20 July 2008, 02:22:25 UTC
builtin-add.c: restructure the code for maintainability
builtin-add.c: restructure the code for maintainability
Tip revision: c972ec0
write_or_die.c
#include "cache.h"
/*
* Some cases use stdio, but want to flush after the write
* to get error handling (and to get better interactive
* behaviour - not buffering excessively).
*
* Of course, if the flush happened within the write itself,
* we've already lost the error code, and cannot report it any
* more. So we just ignore that case instead (and hope we get
* the right error code on the flush).
*
* If the file handle is stdout, and stdout is a file, then skip the
* flush entirely since it's not needed.
*/
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) {
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;
}
if (skip_stdout_flush && !ferror(f))
return;
}
if (fflush(f)) {
/*
* On Windows, EPIPE is returned only by the first write()
* after the reading end has closed its handle; subsequent
* write()s return EINVAL.
*/
if (errno == EPIPE || errno == EINVAL)
exit(0);
die("write failure on %s: %s", desc, strerror(errno));
}
}
ssize_t read_in_full(int fd, void *buf, size_t count)
{
char *p = buf;
ssize_t total = 0;
while (count > 0) {
ssize_t loaded = xread(fd, p, count);
if (loaded <= 0)
return total ? total : loaded;
count -= loaded;
p += loaded;
total += loaded;
}
return total;
}
ssize_t write_in_full(int fd, const void *buf, size_t count)
{
const char *p = buf;
ssize_t total = 0;
while (count > 0) {
ssize_t written = xwrite(fd, p, count);
if (written < 0)
return -1;
if (!written) {
errno = ENOSPC;
return -1;
}
count -= written;
p += written;
total += written;
}
return total;
}
void fsync_or_die(int fd, const char *msg)
{
if (fsync(fd) < 0) {
die("%s: fsync error (%s)", msg, strerror(errno));
}
}
void write_or_die(int fd, const void *buf, size_t count)
{
if (write_in_full(fd, buf, count) < 0) {
if (errno == EPIPE)
exit(0);
die("write error (%s)", strerror(errno));
}
}
int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg)
{
if (write_in_full(fd, buf, count) < 0) {
if (errno == EPIPE)
exit(0);
fprintf(stderr, "%s: write error (%s)\n",
msg, strerror(errno));
return 0;
}
return 1;
}
int write_or_whine(int fd, const void *buf, size_t count, const char *msg)
{
if (write_in_full(fd, buf, count) < 0) {
fprintf(stderr, "%s: write error (%s)\n",
msg, strerror(errno));
return 0;
}
return 1;
}
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