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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-09 16:53:05 (GMT)
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-09 16:53:05 (GMT)
commit33db5f4d9027a10e477ccf054b2c1ab94f74c85a (patch)
tree83941fd0e146733198bcc5fe8c06d50dc9e6c225 /checkout-cache.c
parent734aab758cc2b9f5e2ed43375dbfec1b5bfde43b (diff)
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Add a "checkout-cache" command which does what the name suggests.
I'll also eventually change "read-tree" to only update the cache information, instead of doing a checkout of the tree. Much nicer.
Diffstat (limited to 'checkout-cache.c')
-rw-r--r--checkout-cache.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/checkout-cache.c b/checkout-cache.c
new file mode 100644
index 0000000..b1c086a
--- /dev/null
+++ b/checkout-cache.c
@@ -0,0 +1,140 @@
+/*
+ * 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 int write_entry(struct cache_entry *ce)
+{
+ int fd;
+ void *new;
+ unsigned long size;
+ long wrote;
+
+ new = read_sha1_file(ce->sha1, "blob", &size);
+ if (!new) {
+ fprintf(stderr, "checkout-cache: unable to read sha1 file of %s (%s)",
+ ce->name, sha1_to_hex(ce->sha1));
+ return -1;
+ }
+ fd = open(ce->name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+ if (fd < 0) {
+ fprintf(stderr, "checkout-cache: unable to create %s (%s)",
+ ce->name, strerror(errno));
+ free(new);
+ return -1;
+ }
+ wrote = write(fd, new, size);
+ close(fd);
+ free(new);
+ if (wrote == size)
+ return 0;
+ fprintf(stderr, "checkout-cache: unable to write %s", ce->name);
+ return -1;
+}
+
+static int checkout_entry(struct cache_entry *ce)
+{
+ if (!force) {
+ struct stat st;
+
+ if (!stat(ce->name, &st)) {
+ unsigned changed = cache_match_stat(ce, &st);
+ if (!changed)
+ return 0;
+ if (!quiet)
+ fprintf(stderr, "checkout-cache: %s already exists", ce->name);
+ return -1;
+ }
+ }
+ return write_entry(ce);
+}
+
+static int checkout_file(const char *name)
+{
+ int pos = cache_name_pos(name, strlen(name));
+ if (pos < 0) {
+ if (!quiet)
+ fprintf(stderr, "checkout-cache: %s is not in the cache", name);
+ 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 (checkout_entry(ce) < 0)
+ return -1;
+ }
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ int i, force_filename = 0;
+
+ if (read_cache() < 0) {
+ fprintf(stderr, "Invalid cache");
+ exit(1);
+ }
+
+ 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;
+}