Make "write_cache()" and friends available as generic routines.
[git/git.git] / checkout-cache.c
CommitLineData
33db5f4d
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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;
8d3af1d5 45 char type[20];
33db5f4d 46
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47 new = read_sha1_file(ce->sha1, type, &size);
48 if (!new || strcmp(type, "blob")) {
f7391ce3 49 fprintf(stderr, "checkout-cache: unable to read sha1 file of %s (%s)\n",
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50 ce->name, sha1_to_hex(ce->sha1));
51 return -1;
52 }
53 fd = open(ce->name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
54 if (fd < 0) {
f7391ce3 55 fprintf(stderr, "checkout-cache: unable to create %s (%s)\n",
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56 ce->name, strerror(errno));
57 free(new);
58 return -1;
59 }
60 wrote = write(fd, new, size);
61 close(fd);
62 free(new);
63 if (wrote == size)
64 return 0;
f7391ce3 65 fprintf(stderr, "checkout-cache: unable to write %s\n", ce->name);
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66 return -1;
67}
68
69static int checkout_entry(struct cache_entry *ce)
70{
71 if (!force) {
72 struct stat st;
73
74 if (!stat(ce->name, &st)) {
75 unsigned changed = cache_match_stat(ce, &st);
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76 if (changed && !quiet)
77 fprintf(stderr, "checkout-cache: %s already exists\n", ce->name);
78 return 0;
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79 }
80 }
81 return write_entry(ce);
82}
83
84static int checkout_file(const char *name)
85{
86 int pos = cache_name_pos(name, strlen(name));
87 if (pos < 0) {
88 if (!quiet)
f7391ce3 89 fprintf(stderr, "checkout-cache: %s is not in the cache\n", name);
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90 return -1;
91 }
92 return checkout_entry(active_cache[pos]);
93}
94
95static int checkout_all(void)
96{
97 int i;
98
99 for (i = 0; i < active_nr ; i++) {
100 struct cache_entry *ce = active_cache[i];
101 if (checkout_entry(ce) < 0)
102 return -1;
103 }
104 return 0;
105}
106
107int main(int argc, char **argv)
108{
109 int i, force_filename = 0;
110
111 if (read_cache() < 0) {
f7391ce3 112 fprintf(stderr, "Invalid cache\n");
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113 exit(1);
114 }
115
116 for (i = 1; i < argc; i++) {
117 const char *arg = argv[i];
118 if (!force_filename) {
119 if (!strcmp(arg, "-a")) {
120 checkout_all();
121 continue;
122 }
123 if (!strcmp(arg, "--")) {
124 force_filename = 1;
125 continue;
126 }
127 if (!strcmp(arg, "-f")) {
128 force = 1;
129 continue;
130 }
131 if (!strcmp(arg, "-q")) {
132 quiet = 1;
133 continue;
134 }
135 }
136 checkout_file(arg);
137 }
138 return 0;
139}