Merge branch 'ar/maint-mksnpath' into ar/mksnpath
[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 #include "parse-options.h"
8
9 static const char * const prune_usage[] = {
10         "git prune [-n] [-v] [--expire <time>] [--] [<head>...]",
11         NULL
12 };
13 static int show_only;
14 static int verbose;
15 static unsigned long expire;
16
17 static int prune_tmp_object(const char *path, const char *filename)
18 {
19         const char *fullpath = mkpath("%s/%s", path, filename);
20         if (expire) {
21                 struct stat st;
22                 if (lstat(fullpath, &st))
23                         return error("Could not stat '%s'", fullpath);
24                 if (st.st_mtime > expire)
25                         return 0;
26         }
27         printf("Removing stale temporary file %s\n", fullpath);
28         if (!show_only)
29                 unlink(fullpath);
30         return 0;
31 }
32
33 static int prune_object(char *path, const char *filename, const unsigned char *sha1)
34 {
35         const char *fullpath = mkpath("%s/%s", path, filename);
36         if (expire) {
37                 struct stat st;
38                 if (lstat(fullpath, &st))
39                         return error("Could not stat '%s'", fullpath);
40                 if (st.st_mtime > expire)
41                         return 0;
42         }
43         if (show_only || verbose) {
44                 enum object_type type = sha1_object_info(sha1, NULL);
45                 printf("%s %s\n", sha1_to_hex(sha1),
46                        (type > 0) ? typename(type) : "unknown");
47         }
48         if (!show_only)
49                 unlink(fullpath);
50         return 0;
51 }
52
53 static int prune_dir(int i, char *path)
54 {
55         DIR *dir = opendir(path);
56         struct dirent *de;
57
58         if (!dir)
59                 return 0;
60
61         while ((de = readdir(dir)) != NULL) {
62                 char name[100];
63                 unsigned char sha1[20];
64                 int len = strlen(de->d_name);
65
66                 switch (len) {
67                 case 2:
68                         if (de->d_name[1] != '.')
69                                 break;
70                 case 1:
71                         if (de->d_name[0] != '.')
72                                 break;
73                         continue;
74                 case 38:
75                         sprintf(name, "%02x", i);
76                         memcpy(name+2, de->d_name, len+1);
77                         if (get_sha1_hex(name, sha1) < 0)
78                                 break;
79
80                         /*
81                          * Do we know about this object?
82                          * It must have been reachable
83                          */
84                         if (lookup_object(sha1))
85                                 continue;
86
87                         prune_object(path, de->d_name, sha1);
88                         continue;
89                 }
90                 if (!prefixcmp(de->d_name, "tmp_obj_")) {
91                         prune_tmp_object(path, de->d_name);
92                         continue;
93                 }
94                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
95         }
96         if (!show_only)
97                 rmdir(path);
98         closedir(dir);
99         return 0;
100 }
101
102 static void prune_object_dir(const char *path)
103 {
104         int i;
105         for (i = 0; i < 256; i++) {
106                 static char dir[4096];
107                 sprintf(dir, "%s/%02x", path, i);
108                 prune_dir(i, dir);
109         }
110 }
111
112 /*
113  * Write errors (particularly out of space) can result in
114  * failed temporary packs (and more rarely indexes and other
115  * files begining with "tmp_") accumulating in the object
116  * and the pack directories.
117  */
118 static void remove_temporary_files(const char *path)
119 {
120         DIR *dir;
121         struct dirent *de;
122
123         dir = opendir(path);
124         if (!dir) {
125                 fprintf(stderr, "Unable to open directory %s\n", path);
126                 return;
127         }
128         while ((de = readdir(dir)) != NULL)
129                 if (!prefixcmp(de->d_name, "tmp_"))
130                         prune_tmp_object(path, de->d_name);
131         closedir(dir);
132 }
133
134 int cmd_prune(int argc, const char **argv, const char *prefix)
135 {
136         struct rev_info revs;
137         const struct option options[] = {
138                 OPT_BOOLEAN('n', NULL, &show_only,
139                             "do not remove, show only"),
140                 OPT_BOOLEAN('v', NULL, &verbose,
141                         "report pruned objects"),
142                 OPT_DATE(0, "expire", &expire,
143                          "expire objects older than <time>"),
144                 OPT_END()
145         };
146         char *s;
147
148         save_commit_buffer = 0;
149         init_revisions(&revs, prefix);
150
151         argc = parse_options(argc, argv, options, prune_usage, 0);
152         while (argc--) {
153                 unsigned char sha1[20];
154                 const char *name = *argv++;
155
156                 if (!get_sha1(name, sha1)) {
157                         struct object *object = parse_object(sha1);
158                         if (!object)
159                                 die("bad object: %s", name);
160                         add_pending_object(&revs, object, "");
161                 }
162                 else
163                         die("unrecognized argument: %s", name);
164         }
165         mark_reachable_objects(&revs, 1);
166         prune_object_dir(get_object_directory());
167
168         prune_packed_objects(show_only);
169         remove_temporary_files(get_object_directory());
170         s = xstrdup(mkpath("%s/pack", get_object_directory()));
171         remove_temporary_files(s);
172         free(s);
173         return 0;
174 }