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![Christopher Li](/assets/img/avatar_default.png)
Introduce xmalloc and xrealloc to die gracefully with a descriptive message when out of memory, rather than taking a SIGSEGV. Signed-off-by: Christopher Li<chrislgit@chrisli.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
199 lines
4.5 KiB
C
199 lines
4.5 KiB
C
/*
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* Check-out files from the "current cache directory"
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*
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* Copyright (C) 2005 Linus Torvalds
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*
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* Careful: order of argument flags does matter. For example,
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*
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* checkout-cache -a -f file.c
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*
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* Will first check out all files listed in the cache (but not
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* overwrite any old ones), and then force-checkout "file.c" a
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* second time (ie that one _will_ overwrite any old contents
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* with the same filename).
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*
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* Also, just doing "checkout-cache" does nothing. You probably
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* meant "checkout-cache -a". And if you want to force it, you
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* want "checkout-cache -f -a".
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*
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* Intuitiveness is not the goal here. Repeatability is. The
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* reason for the "no arguments means no work" thing is that
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* from scripts you are supposed to be able to do things like
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*
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* find . -name '*.h' -print0 | xargs -0 checkout-cache -f --
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*
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* which will force all existing *.h files to be replaced with
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* their cached copies. If an empty command line implied "all",
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* then this would force-refresh everything in the cache, which
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* was not the point.
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*
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* Oh, and the "--" is just a good idea when you know the rest
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* will be filenames. Just so that you wouldn't have a filename
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* of "-a" causing problems (not possible in the above example,
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* but get used to it in scripting!).
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*/
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#include "cache.h"
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static int force = 0, quiet = 0, not_new = 0;
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static void create_directories(const char *path)
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{
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int len = strlen(path);
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char *buf = xmalloc(len + 1);
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const char *slash = path;
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while ((slash = strchr(slash+1, '/')) != NULL) {
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len = slash - path;
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memcpy(buf, path, len);
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buf[len] = 0;
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mkdir(buf, 0755);
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}
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}
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static int create_file(const char *path, unsigned int mode)
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{
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int fd;
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mode = (mode & 0100) ? 0777 : 0666;
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fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
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if (fd < 0) {
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if (errno == ENOENT) {
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create_directories(path);
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fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
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}
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}
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return fd;
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}
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static int write_entry(struct cache_entry *ce, const char *path)
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{
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int fd;
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void *new;
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unsigned long size;
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long wrote;
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char type[20];
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new = read_sha1_file(ce->sha1, type, &size);
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if (!new || strcmp(type, "blob")) {
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return error("checkout-cache: unable to read sha1 file of %s (%s)",
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path, sha1_to_hex(ce->sha1));
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}
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fd = create_file(path, ntohl(ce->ce_mode));
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if (fd < 0) {
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free(new);
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return error("checkout-cache: unable to create %s (%s)",
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path, strerror(errno));
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}
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wrote = write(fd, new, size);
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close(fd);
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free(new);
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if (wrote != size)
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return error("checkout-cache: unable to write %s", path);
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return 0;
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}
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static int checkout_entry(struct cache_entry *ce, const char *base_dir)
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{
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struct stat st;
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static char path[MAXPATHLEN+1];
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int len = strlen(base_dir);
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memcpy(path, base_dir, len);
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strcpy(path + len, ce->name);
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if (!stat(path, &st)) {
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unsigned changed = cache_match_stat(ce, &st);
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if (!changed)
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return 0;
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if (!force) {
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if (!quiet)
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fprintf(stderr, "checkout-cache: %s already exists\n", path);
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return 0;
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}
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/*
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* We unlink the old file, to get the new one with the
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* right permissions (including umask, which is nasty
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* to emulate by hand - much easier to let the system
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* just do the right thing)
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*/
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unlink(path);
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} else if (not_new)
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return 0;
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return write_entry(ce, path);
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}
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static int checkout_file(const char *name, const char *base_dir)
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{
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int pos = cache_name_pos(name, strlen(name));
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if (pos < 0) {
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if (!quiet) {
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pos = -pos - 1;
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fprintf(stderr,
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"checkout-cache: %s is %s.\n",
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name,
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(pos < active_nr &&
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!strcmp(active_cache[pos]->name, name)) ?
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"unmerged" : "not in the cache");
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}
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return -1;
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}
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return checkout_entry(active_cache[pos], base_dir);
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}
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static int checkout_all(const char *base_dir)
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{
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int i;
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for (i = 0; i < active_nr ; i++) {
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struct cache_entry *ce = active_cache[i];
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if (ce_stage(ce))
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continue;
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if (checkout_entry(ce, base_dir) < 0)
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return -1;
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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int i, force_filename = 0;
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const char *base_dir = "";
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if (read_cache() < 0) {
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die("invalid cache");
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}
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for (i = 1; i < argc; i++) {
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const char *arg = argv[i];
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if (!force_filename) {
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if (!strcmp(arg, "-a")) {
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checkout_all(base_dir);
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continue;
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}
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if (!strcmp(arg, "--")) {
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force_filename = 1;
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continue;
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}
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if (!strcmp(arg, "-f")) {
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force = 1;
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continue;
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}
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if (!strcmp(arg, "-q")) {
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quiet = 1;
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continue;
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}
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if (!strcmp(arg, "-n")) {
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not_new = 1;
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continue;
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}
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if (!memcmp(arg, "--prefix=", 9)) {
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base_dir = arg+9;
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continue;
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}
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}
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checkout_file(arg, base_dir);
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}
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return 0;
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}
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