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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
static int read_one_entry(unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode)
{
int len = strlen(pathname);
unsigned int size = cache_entry_size(baselen + len);
struct cache_entry *ce = malloc(size);
memset(ce, 0, size);
ce->st_mode = mode;
ce->namelen = baselen + len;
memcpy(ce->name, base, baselen);
memcpy(ce->name + baselen, pathname, len+1);
memcpy(ce->sha1, sha1, 20);
return add_cache_entry(ce, 1);
}
static int read_tree(unsigned char *sha1, const char *base, int baselen)
{
void *buffer;
unsigned long size;
char type[20];
buffer = read_sha1_file(sha1, type, &size);
if (!buffer)
return -1;
if (strcmp(type, "tree"))
return -1;
while (size) {
int len = strlen(buffer)+1;
unsigned char *sha1 = buffer + len;
char *path = strchr(buffer, ' ')+1;
unsigned int mode;
if (size < len + 20 || sscanf(buffer, "%o", &mode) != 1)
return -1;
buffer = sha1 + 20;
size -= len + 20;
if (S_ISDIR(mode)) {
int retval;
int pathlen = strlen(path);
char *newbase = malloc(baselen + 1 + pathlen);
memcpy(newbase, base, baselen);
memcpy(newbase + baselen, path, pathlen);
newbase[baselen + pathlen] = '/';
retval = read_tree(sha1, newbase, baselen + pathlen + 1);
free(newbase);
if (retval)
return -1;
continue;
}
if (read_one_entry(sha1, base, baselen, path, mode) < 0)
return -1;
}
return 0;
}
static int remove_lock = 0;
static void remove_lock_file(void)
{
if (remove_lock)
unlink(".git/index.lock");
}
int main(int argc, char **argv)
{
int i, newfd;
unsigned char sha1[20];
newfd = open(".git/index.lock", O_RDWR | O_CREAT | O_EXCL, 0600);
if (newfd < 0)
die("unable to create new cachefile");
atexit(remove_lock_file);
remove_lock = 1;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
/* "-m" stands for "merge" current directory cache */
if (!strcmp(arg, "-m")) {
if (active_cache)
die("read-tree: cannot merge old cache on top of new");
if (read_cache() < 0)
die("read-tree: corrupt directory cache");
continue;
}
if (get_sha1_hex(arg, sha1) < 0)
usage("read-tree [-m] <sha1>");
if (read_tree(sha1, "", 0) < 0)
die("failed to unpack tree object %s", arg);
}
if (write_cache(newfd, active_cache, active_nr) ||
rename(".git/index.lock", ".git/index"))
die("unable to write new index file");
remove_lock = 0;
return 0;
}
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