Add a "checkout-cache" command which does what the name suggests.
[git/git.git] / checkout-cache.c
CommitLineData
33db5f4d
LT
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) {
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
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);
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
85static 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
96static 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
108int 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}