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