Merge commit 'doc/http-backend: missing accent grave in literal mark-up'
[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 "progress.h"
9 #include "dir.h"
10
11 static const char * const prune_usage[] = {
12         N_("git prune [-n] [-v] [--expire <time>] [--] [<head>...]"),
13         NULL
14 };
15 static int show_only;
16 static int verbose;
17 static unsigned long expire;
18 static int show_progress = -1;
19
20 static int prune_tmp_file(const char *fullpath)
21 {
22         struct stat st;
23         if (lstat(fullpath, &st))
24                 return error("Could not stat '%s'", fullpath);
25         if (st.st_mtime > expire)
26                 return 0;
27         if (show_only || verbose)
28                 printf("Removing stale temporary file %s\n", fullpath);
29         if (!show_only)
30                 unlink_or_warn(fullpath);
31         return 0;
32 }
33
34 static int prune_object(const char *fullpath, const unsigned char *sha1)
35 {
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         if (show_only || verbose) {
42                 enum object_type type = sha1_object_info(sha1, NULL);
43                 printf("%s %s\n", sha1_to_hex(sha1),
44                        (type > 0) ? typename(type) : "unknown");
45         }
46         if (!show_only)
47                 unlink_or_warn(fullpath);
48         return 0;
49 }
50
51 static int prune_dir(int i, struct strbuf *path)
52 {
53         size_t baselen = path->len;
54         DIR *dir = opendir(path->buf);
55         struct dirent *de;
56
57         if (!dir)
58                 return 0;
59
60         while ((de = readdir(dir)) != NULL) {
61                 char name[100];
62                 unsigned char sha1[20];
63
64                 if (is_dot_or_dotdot(de->d_name))
65                         continue;
66                 if (strlen(de->d_name) == 38) {
67                         sprintf(name, "%02x", i);
68                         memcpy(name+2, de->d_name, 39);
69                         if (get_sha1_hex(name, sha1) < 0)
70                                 break;
71
72                         /*
73                          * Do we know about this object?
74                          * It must have been reachable
75                          */
76                         if (lookup_object(sha1))
77                                 continue;
78
79                         strbuf_addf(path, "/%s", de->d_name);
80                         prune_object(path->buf, sha1);
81                         strbuf_setlen(path, baselen);
82                         continue;
83                 }
84                 if (starts_with(de->d_name, "tmp_obj_")) {
85                         strbuf_addf(path, "/%s", de->d_name);
86                         prune_tmp_file(path->buf);
87                         strbuf_setlen(path, baselen);
88                         continue;
89                 }
90                 fprintf(stderr, "bad sha1 file: %s/%s\n", path->buf, de->d_name);
91         }
92         closedir(dir);
93         if (!show_only)
94                 rmdir(path->buf);
95         return 0;
96 }
97
98 static void prune_object_dir(const char *path)
99 {
100         struct strbuf buf = STRBUF_INIT;
101         size_t baselen;
102         int i;
103
104         strbuf_addstr(&buf, path);
105         strbuf_addch(&buf, '/');
106         baselen = buf.len;
107
108         for (i = 0; i < 256; i++) {
109                 strbuf_addf(&buf, "%02x", i);
110                 prune_dir(i, &buf);
111                 strbuf_setlen(&buf, baselen);
112         }
113 }
114
115 /*
116  * Write errors (particularly out of space) can result in
117  * failed temporary packs (and more rarely indexes and other
118  * files beginning with "tmp_") accumulating in the object
119  * and the pack directories.
120  */
121 static void remove_temporary_files(const char *path)
122 {
123         DIR *dir;
124         struct dirent *de;
125
126         dir = opendir(path);
127         if (!dir) {
128                 fprintf(stderr, "Unable to open directory %s\n", path);
129                 return;
130         }
131         while ((de = readdir(dir)) != NULL)
132                 if (starts_with(de->d_name, "tmp_"))
133                         prune_tmp_file(mkpath("%s/%s", path, de->d_name));
134         closedir(dir);
135 }
136
137 int cmd_prune(int argc, const char **argv, const char *prefix)
138 {
139         struct rev_info revs;
140         struct progress *progress = NULL;
141         const struct option options[] = {
142                 OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
143                 OPT__VERBOSE(&verbose, N_("report pruned objects")),
144                 OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
145                 OPT_EXPIRY_DATE(0, "expire", &expire,
146                                 N_("expire objects older than <time>")),
147                 OPT_END()
148         };
149         char *s;
150
151         expire = ULONG_MAX;
152         save_commit_buffer = 0;
153         read_replace_refs = 0;
154         init_revisions(&revs, prefix);
155
156         argc = parse_options(argc, argv, prefix, options, prune_usage, 0);
157         while (argc--) {
158                 unsigned char sha1[20];
159                 const char *name = *argv++;
160
161                 if (!get_sha1(name, sha1)) {
162                         struct object *object = parse_object_or_die(sha1, name);
163                         add_pending_object(&revs, object, "");
164                 }
165                 else
166                         die("unrecognized argument: %s", name);
167         }
168
169         if (show_progress == -1)
170                 show_progress = isatty(2);
171         if (show_progress)
172                 progress = start_progress_delay("Checking connectivity", 0, 0, 2);
173
174         mark_reachable_objects(&revs, 1, progress);
175         stop_progress(&progress);
176         prune_object_dir(get_object_directory());
177
178         prune_packed_objects(show_only ? PRUNE_PACKED_DRY_RUN : 0);
179         remove_temporary_files(get_object_directory());
180         s = mkpathdup("%s/pack", get_object_directory());
181         remove_temporary_files(s);
182         free(s);
183
184         if (is_repository_shallow())
185                 prune_shallow(show_only);
186
187         return 0;
188 }