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Teach git-checkout-index to read filenames from stdin.

Browse source 
Since git-checkout-index is often used from scripts which
may have a stream of filenames they wish to checkout it is
more convenient to use --stdin than xargs.  On platforms
where fork performance is currently sub-optimal and
the length of a command line is limited (*cough* Cygwin
*cough*) running a single git-checkout-index process for
a large number of files beats spawning it multiple times
from xargs.

File names are still accepted on the command line if
--stdin is not supplied.  Nothing is performed if no files
are supplied on the command line or by stdin.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Shawn Pearce 2006-02-28 21:43:33 -05:00 committed by Junio C Hamano
parent 858cbfbabe
commit 9debe63d10
2 changed files with 59 additions and 2 deletions
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20
Documentation/git-checkout-index.txt
View file

@ -10,7 +10,9 @@ SYNOPSIS
--------
[verse]
'git-checkout-index' [-u] [-q] [-a] [-f] [-n] [--prefix=<string>]
[--stage=<number>] [--] <file>...
[--stage=<number>]
[-z] [--stdin]
[--] [<file>]\*
DESCRIPTION
-----------
@ -45,6 +47,15 @@ OPTIONS
Instead of checking out unmerged entries, copy out the
files from named stage. <number> must be between 1 and 3.
--stdin::
Instead of taking list of paths from the command line,
read list of paths from the standard input. Paths are
separated by LF (i.e. one path per line) by default.
-z::
Only meaningful with `--stdin`; paths are separated with
NUL character instead of LF.
--::
Do not interpret any more arguments as options.
@ -64,7 +75,12 @@ $ find . -name '*.h' -print0 | xargs -0 git-checkout-index -f --
which will force all existing `*.h` files to be replaced with their
cached copies. If an empty command line implied "all", then this would
force-refresh everything in the index, which was not the point.
force-refresh everything in the index, which was not the point. But
since git-checkout-index accepts --stdin it would be faster to use:
----------------
$ find . -name '*.h' -print0 | git-checkout-index -f -z --stdin
----------------
The `--` is just a good idea when you know the rest will be filenames;
it will prevent problems with a filename of, for example, `-a`.

41
checkout-index.c
View file

@ -22,6 +22,10 @@
*
* find . -name '*.h' -print0 | xargs -0 git-checkout-index -f --
*
* or:
*
* find . -name '*.h' -print0 | git-checkout-index -f -z --stdin
*
* which will force all existing *.h files to be replaced with
* their cached copies. If an empty command line implied "all",
* then this would force-refresh everything in the cache, which
@ -33,6 +37,8 @@
* but get used to it in scripting!).
*/
#include "cache.h"
#include "strbuf.h"
#include "quote.h"
static const char *prefix;
static int prefix_length;
@ -114,6 +120,8 @@ int main(int argc, char **argv)
int i;
int newfd = -1;
int all = 0;
int read_from_stdin = 0;
int line_termination = '\n';
prefix = setup_git_directory();
git_config(git_default_config);
@ -156,6 +164,17 @@ int main(int argc, char **argv)
die("cannot open index.lock file.");
continue;
}
if (!strcmp(arg, "-z")) {
line_termination = 0;
continue;
}
if (!strcmp(arg, "--stdin")) {
if (i != argc - 1)
die("--stdin must be at the end");
read_from_stdin = 1;
i++; /* do not consider arg as a file name */
break;
}
if (!strncmp(arg, "--prefix=", 9)) {
state.base_dir = arg+9;
state.base_dir_len = strlen(state.base_dir);
@ -191,9 +210,31 @@ int main(int argc, char **argv)
if (all)
die("git-checkout-index: don't mix '--all' and explicit filenames");
if (read_from_stdin)
die("git-checkout-index: don't mix '--stdin' and explicit filenames");
checkout_file(prefix_path(prefix, prefix_length, arg));
}
if (read_from_stdin) {
struct strbuf buf;
if (all)
die("git-checkout-index: don't mix '--all' and '--stdin'");
strbuf_init(&buf);
while (1) {
char *path_name;
read_line(&buf, stdin, line_termination);
if (buf.eof)
break;
if (line_termination && buf.buf[0] == '"')
path_name = unquote_c_style(buf.buf, NULL);
else
path_name = buf.buf;
checkout_file(prefix_path(prefix, prefix_length, path_name));
if (path_name != buf.buf)
free(path_name);
}
}
if (all)
checkout_all();