Fix up "checkout-cache" a bit
[git/git.git] / checkout-cache.c
CommitLineData
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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
37static int force = 0, quiet = 0;
38
39static 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) {
f7391ce3 48 fprintf(stderr, "checkout-cache: unable to read sha1 file of %s (%s)\n",
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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) {
f7391ce3 54 fprintf(stderr, "checkout-cache: unable to create %s (%s)\n",
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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;
f7391ce3 64 fprintf(stderr, "checkout-cache: unable to write %s\n", ce->name);
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65 return -1;
66}
67
68static 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);
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75 if (changed && !quiet)
76 fprintf(stderr, "checkout-cache: %s already exists\n", ce->name);
77 return 0;
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78 }
79 }
80 return write_entry(ce);
81}
82
83static int checkout_file(const char *name)
84{
85 int pos = cache_name_pos(name, strlen(name));
86 if (pos < 0) {
87 if (!quiet)
f7391ce3 88 fprintf(stderr, "checkout-cache: %s is not in the cache\n", name);
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89 return -1;
90 }
91 return checkout_entry(active_cache[pos]);
92}
93
94static int checkout_all(void)
95{
96 int i;
97
98 for (i = 0; i < active_nr ; i++) {
99 struct cache_entry *ce = active_cache[i];
100 if (checkout_entry(ce) < 0)
101 return -1;
102 }
103 return 0;
104}
105
106int main(int argc, char **argv)
107{
108 int i, force_filename = 0;
109
110 if (read_cache() < 0) {
f7391ce3 111 fprintf(stderr, "Invalid cache\n");
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112 exit(1);
113 }
114
115 for (i = 1; i < argc; i++) {
116 const char *arg = argv[i];
117 if (!force_filename) {
118 if (!strcmp(arg, "-a")) {
119 checkout_all();
120 continue;
121 }
122 if (!strcmp(arg, "--")) {
123 force_filename = 1;
124 continue;
125 }
126 if (!strcmp(arg, "-f")) {
127 force = 1;
128 continue;
129 }
130 if (!strcmp(arg, "-q")) {
131 quiet = 1;
132 continue;
133 }
134 }
135 checkout_file(arg);
136 }
137 return 0;
138}