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|
/*
* Check-out files from the "current cache directory"
*
* Copyright (C) 2005 Linus Torvalds
*
* Careful: order of argument flags does matter. For example,
*
* checkout-cache -a -f file.c
*
* Will first check out all files listed in the cache (but not
* overwrite any old ones), and then force-checkout "file.c" a
* second time (ie that one _will_ overwrite any old contents
* with the same filename).
*
* Also, just doing "checkout-cache" does nothing. You probably
* meant "checkout-cache -a". And if you want to force it, you
* want "checkout-cache -f -a".
*
* Intuitiveness is not the goal here. Repeatability is. The
* reason for the "no arguments means no work" thing is that
* from scripts you are supposed to be able to do things like
*
* find . -name '*.h' -print0 | xargs -0 checkout-cache -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 cache, which
* was not the point.
*
* Oh, and the "--" is just a good idea when you know the rest
* will be filenames. Just so that you wouldn't have a filename
* of "-a" causing problems (not possible in the above example,
* but get used to it in scripting!).
*/
#include "cache.h"
static int force = 0, quiet = 0;
static void create_directories(const char *path)
{
int len = strlen(path);
char *buf = malloc(len + 1);
const char *slash = path;
while ((slash = strchr(slash+1, '/')) != NULL) {
len = slash - path;
memcpy(buf, path, len);
buf[len] = 0;
mkdir(buf, 0755);
}
}
static int create_file(const char *path, unsigned int mode)
{
int fd;
mode = (mode & 0100) ? 0777 : 0666;
fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
if (fd < 0) {
if (errno == ENOENT) {
create_directories(path);
fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
}
}
return fd;
}
static int write_entry(struct cache_entry *ce)
{
int fd;
void *new;
unsigned long size;
long wrote;
char type[20];
new = read_sha1_file(ce->sha1, type, &size);
if (!new || strcmp(type, "blob")) {
return error("checkout-cache: unable to read sha1 file of %s (%s)",
ce->name, sha1_to_hex(ce->sha1));
}
fd = create_file(ce->name, ntohl(ce->ce_mode));
if (fd < 0) {
free(new);
return error("checkout-cache: unable to create %s (%s)",
ce->name, strerror(errno));
}
wrote = write(fd, new, size);
close(fd);
free(new);
if (wrote != size)
return error("checkout-cache: unable to write %s", ce->name);
return 0;
}
static int checkout_entry(struct cache_entry *ce)
{
struct stat st;
if (!stat(ce->name, &st)) {
unsigned changed = cache_match_stat(ce, &st);
if (!changed)
return 0;
if (!force) {
if (!quiet)
fprintf(stderr, "checkout-cache: %s already exists\n", ce->name);
return 0;
}
/*
* We unlink the old file, to get the new one with the
* right permissions (including umask, which is nasty
* to emulate by hand - much easier to let the system
* just do the right thing)
*/
unlink(ce->name);
}
return write_entry(ce);
}
static int checkout_file(const char *name)
{
int pos = cache_name_pos(name, strlen(name));
if (pos < 0) {
if (!quiet) {
pos = -pos - 1;
fprintf(stderr,
"checkout-cache: %s is %s.\n",
name,
(pos < active_nr &&
!strcmp(active_cache[pos]->name, name)) ?
"unmerged" : "not in the cache");
}
return -1;
}
return checkout_entry(active_cache[pos]);
}
static int checkout_all(void)
{
int i;
for (i = 0; i < active_nr ; i++) {
struct cache_entry *ce = active_cache[i];
if (ce_stage(ce))
continue;
if (checkout_entry(ce) < 0)
return -1;
}
return 0;
}
int main(int argc, char **argv)
{
int i, force_filename = 0;
if (read_cache() < 0) {
die("invalid cache");
}
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (!force_filename) {
if (!strcmp(arg, "-a")) {
checkout_all();
continue;
}
if (!strcmp(arg, "--")) {
force_filename = 1;
continue;
}
if (!strcmp(arg, "-f")) {
force = 1;
continue;
}
if (!strcmp(arg, "-q")) {
quiet = 1;
continue;
}
}
checkout_file(arg);
}
return 0;
}
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