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| 1 | +/* |
| 2 | + * Check-out files from the "current cache directory" |
| 3 | + * |
| 4 | + * Copyright (C) 2005 Linus Torvalds |
| 5 | + * |
| 6 | + * Careful: order of argument flags does matter. For example, |
| 7 | + * |
| 8 | + * checkout-cache -a -f file.c |
| 9 | + * |
| 10 | + * Will first check out all files listed in the cache (but not |
| 11 | + * overwrite any old ones), and then force-checkout "file.c" a |
| 12 | + * second time (ie that one _will_ overwrite any old contents |
| 13 | + * with the same filename). |
| 14 | + * |
| 15 | + * Also, just doing "checkout-cache" does nothing. You probably |
| 16 | + * meant "checkout-cache -a". And if you want to force it, you |
| 17 | + * want "checkout-cache -f -a". |
| 18 | + * |
| 19 | + * Intuitiveness is not the goal here. Repeatability is. The |
| 20 | + * reason for the "no arguments means no work" thing is that |
| 21 | + * from scripts you are supposed to be able to do things like |
| 22 | + * |
| 23 | + * find . -name '*.h' -print0 | xargs -0 checkout-cache -f -- |
| 24 | + * |
| 25 | + * which will force all existing *.h files to be replaced with |
| 26 | + * their cached copies. If an empty command line implied "all", |
| 27 | + * then this would force-refresh everything in the cache, which |
| 28 | + * was not the point. |
| 29 | + * |
| 30 | + * Oh, and the "--" is just a good idea when you know the rest |
| 31 | + * will be filenames. Just so that you wouldn't have a filename |
| 32 | + * of "-a" causing problems (not possible in the above example, |
| 33 | + * but get used to it in scripting!). |
| 34 | + */ |
| 35 | +#include "cache.h" |
| 36 | + |
| 37 | +static int force = 0, quiet = 0; |
| 38 | + |
| 39 | +static int write_entry(struct cache_entry *ce) |
| 40 | +{ |
| 41 | + int fd; |
| 42 | + void *new; |
| 43 | + unsigned long size; |
| 44 | + long wrote; |
| 45 | + |
| 46 | + new = read_sha1_file(ce->sha1, "blob", &size); |
| 47 | + if (!new) { |
| 48 | + fprintf(stderr, "checkout-cache: unable to read sha1 file of %s (%s)", |
| 49 | + ce->name, sha1_to_hex(ce->sha1)); |
| 50 | + return -1; |
| 51 | + } |
| 52 | + fd = open(ce->name, O_WRONLY | O_CREAT | O_TRUNC, 0600); |
| 53 | + if (fd < 0) { |
| 54 | + fprintf(stderr, "checkout-cache: unable to create %s (%s)", |
| 55 | + ce->name, strerror(errno)); |
| 56 | + free(new); |
| 57 | + return -1; |
| 58 | + } |
| 59 | + wrote = write(fd, new, size); |
| 60 | + close(fd); |
| 61 | + free(new); |
| 62 | + if (wrote == size) |
| 63 | + return 0; |
| 64 | + fprintf(stderr, "checkout-cache: unable to write %s", ce->name); |
| 65 | + return -1; |
| 66 | +} |
| 67 | + |
| 68 | +static int checkout_entry(struct cache_entry *ce) |
| 69 | +{ |
| 70 | + if (!force) { |
| 71 | + struct stat st; |
| 72 | + |
| 73 | + if (!stat(ce->name, &st)) { |
| 74 | + unsigned changed = cache_match_stat(ce, &st); |
| 75 | + if (!changed) |
| 76 | + return 0; |
| 77 | + if (!quiet) |
| 78 | + fprintf(stderr, "checkout-cache: %s already exists", ce->name); |
| 79 | + return -1; |
| 80 | + } |
| 81 | + } |
| 82 | + return write_entry(ce); |
| 83 | +} |
| 84 | + |
| 85 | +static int checkout_file(const char *name) |
| 86 | +{ |
| 87 | + int pos = cache_name_pos(name, strlen(name)); |
| 88 | + if (pos < 0) { |
| 89 | + if (!quiet) |
| 90 | + fprintf(stderr, "checkout-cache: %s is not in the cache", name); |
| 91 | + return -1; |
| 92 | + } |
| 93 | + return checkout_entry(active_cache[pos]); |
| 94 | +} |
| 95 | + |
| 96 | +static int checkout_all(void) |
| 97 | +{ |
| 98 | + int i; |
| 99 | + |
| 100 | + for (i = 0; i < active_nr ; i++) { |
| 101 | + struct cache_entry *ce = active_cache[i]; |
| 102 | + if (checkout_entry(ce) < 0) |
| 103 | + return -1; |
| 104 | + } |
| 105 | + return 0; |
| 106 | +} |
| 107 | + |
| 108 | +int main(int argc, char **argv) |
| 109 | +{ |
| 110 | + int i, force_filename = 0; |
| 111 | + |
| 112 | + if (read_cache() < 0) { |
| 113 | + fprintf(stderr, "Invalid cache"); |
| 114 | + exit(1); |
| 115 | + } |
| 116 | + |
| 117 | + for (i = 1; i < argc; i++) { |
| 118 | + const char *arg = argv[i]; |
| 119 | + if (!force_filename) { |
| 120 | + if (!strcmp(arg, "-a")) { |
| 121 | + checkout_all(); |
| 122 | + continue; |
| 123 | + } |
| 124 | + if (!strcmp(arg, "--")) { |
| 125 | + force_filename = 1; |
| 126 | + continue; |
| 127 | + } |
| 128 | + if (!strcmp(arg, "-f")) { |
| 129 | + force = 1; |
| 130 | + continue; |
| 131 | + } |
| 132 | + if (!strcmp(arg, "-q")) { |
| 133 | + quiet = 1; |
| 134 | + continue; |
| 135 | + } |
| 136 | + } |
| 137 | + checkout_file(arg); |
| 138 | + } |
| 139 | + return 0; |
| 140 | +} |
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