diff options
| -rw-r--r-- | Makefile | 6 | ||||
| -rw-r--r-- | checkout-cache.c | 140 |
2 files changed, 145 insertions, 1 deletions
@@ -1,7 +1,8 @@ CFLAGS=-g -O3 -Wall CC=gcc -PROG=update-cache show-diff init-db write-tree read-tree commit-tree cat-file fsck-cache +PROG= update-cache show-diff init-db write-tree read-tree commit-tree \ + cat-file fsck-cache checkout-cache all: $(PROG) @@ -33,6 +34,9 @@ cat-file: cat-file.o read-cache.o fsck-cache: fsck-cache.o read-cache.o $(CC) $(CFLAGS) -o fsck-cache fsck-cache.o read-cache.o $(LIBS) +checkout-cache: checkout-cache.o read-cache.o + $(CC) $(CFLAGS) -o checkout-cache checkout-cache.o read-cache.o $(LIBS) + read-cache.o: cache.h show-diff.o: cache.h diff --git a/checkout-cache.c b/checkout-cache.c new file mode 100644 index 0000000000..b1c086a7ce --- /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; +} |