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