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

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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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41
checkout-index.c
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@ -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();