git-merge: no reason to use cpio anymore
[git] / builtin-prune.c
1 #include "cache.h"
2 #include "commit.h"
3 #include "diff.h"
4 #include "revision.h"
5 #include "builtin.h"
6 #include "reachable.h"
7
8 static const char prune_usage[] = "git-prune [-n]";
9 static int show_only;
10
11 static int prune_object(char *path, const char *filename, const unsigned char *sha1)
12 {
13         if (show_only) {
14                 enum object_type type = sha1_object_info(sha1, NULL);
15                 printf("%s %s\n", sha1_to_hex(sha1),
16                        (type > 0) ? typename(type) : "unknown");
17         } else
18                 unlink(mkpath("%s/%s", path, filename));
19         return 0;
20 }
21
22 static int prune_dir(int i, char *path)
23 {
24         DIR *dir = opendir(path);
25         struct dirent *de;
26
27         if (!dir)
28                 return 0;
29
30         while ((de = readdir(dir)) != NULL) {
31                 char name[100];
32                 unsigned char sha1[20];
33                 int len = strlen(de->d_name);
34
35                 switch (len) {
36                 case 2:
37                         if (de->d_name[1] != '.')
38                                 break;
39                 case 1:
40                         if (de->d_name[0] != '.')
41                                 break;
42                         continue;
43                 case 38:
44                         sprintf(name, "%02x", i);
45                         memcpy(name+2, de->d_name, len+1);
46                         if (get_sha1_hex(name, sha1) < 0)
47                                 break;
48
49                         /*
50                          * Do we know about this object?
51                          * It must have been reachable
52                          */
53                         if (lookup_object(sha1))
54                                 continue;
55
56                         prune_object(path, de->d_name, sha1);
57                         continue;
58                 }
59                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
60         }
61         if (!show_only)
62                 rmdir(path);
63         closedir(dir);
64         return 0;
65 }
66
67 static void prune_object_dir(const char *path)
68 {
69         int i;
70         for (i = 0; i < 256; i++) {
71                 static char dir[4096];
72                 sprintf(dir, "%s/%02x", path, i);
73                 prune_dir(i, dir);
74         }
75 }
76
77 int cmd_prune(int argc, const char **argv, const char *prefix)
78 {
79         int i;
80         struct rev_info revs;
81
82         for (i = 1; i < argc; i++) {
83                 const char *arg = argv[i];
84                 if (!strcmp(arg, "-n")) {
85                         show_only = 1;
86                         continue;
87                 }
88                 usage(prune_usage);
89         }
90
91         save_commit_buffer = 0;
92         init_revisions(&revs, prefix);
93         mark_reachable_objects(&revs, 1);
94
95         prune_object_dir(get_object_directory());
96
97         sync();
98         prune_packed_objects(show_only);
99         return 0;
100 }