Merge branch 'rj/platform-pread-may-be-thread-unsafe' 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 "progress.h"
9 #include "dir.h"
10
11 static const char * const prune_usage[] = {
12         "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_object(const char *path, const char *filename)
21 {
22         const char *fullpath = mkpath("%s/%s", path, filename);
23         struct stat st;
24         if (lstat(fullpath, &st))
25                 return error("Could not stat '%s'", fullpath);
26         if (st.st_mtime > expire)
27                 return 0;
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(char *path, const char *filename, const unsigned char *sha1)
35 {
36         const char *fullpath = mkpath("%s/%s", path, filename);
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         if (show_only || verbose) {
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         }
47         if (!show_only)
48                 unlink_or_warn(fullpath);
49         return 0;
50 }
51
52 static int prune_dir(int i, char *path)
53 {
54         DIR *dir = opendir(path);
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                         prune_object(path, de->d_name, sha1);
80                         continue;
81                 }
82                 if (!prefixcmp(de->d_name, "tmp_obj_")) {
83                         prune_tmp_object(path, de->d_name);
84                         continue;
85                 }
86                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
87         }
88         closedir(dir);
89         if (!show_only)
90                 rmdir(path);
91         return 0;
92 }
93
94 static void prune_object_dir(const char *path)
95 {
96         int i;
97         for (i = 0; i < 256; i++) {
98                 static char dir[4096];
99                 sprintf(dir, "%s/%02x", path, i);
100                 prune_dir(i, dir);
101         }
102 }
103
104 /*
105  * Write errors (particularly out of space) can result in
106  * failed temporary packs (and more rarely indexes and other
107  * files beginning with "tmp_") accumulating in the object
108  * and the pack directories.
109  */
110 static void remove_temporary_files(const char *path)
111 {
112         DIR *dir;
113         struct dirent *de;
114
115         dir = opendir(path);
116         if (!dir) {
117                 fprintf(stderr, "Unable to open directory %s\n", path);
118                 return;
119         }
120         while ((de = readdir(dir)) != NULL)
121                 if (!prefixcmp(de->d_name, "tmp_"))
122                         prune_tmp_object(path, de->d_name);
123         closedir(dir);
124 }
125
126 int cmd_prune(int argc, const char **argv, const char *prefix)
127 {
128         struct rev_info revs;
129         struct progress *progress = NULL;
130         const struct option options[] = {
131                 OPT__DRY_RUN(&show_only, "do not remove, show only"),
132                 OPT__VERBOSE(&verbose, "report pruned objects"),
133                 OPT_BOOL(0, "progress", &show_progress, "show progress"),
134                 OPT_DATE(0, "expire", &expire,
135                          "expire objects older than <time>"),
136                 OPT_END()
137         };
138         char *s;
139
140         expire = ULONG_MAX;
141         save_commit_buffer = 0;
142         read_replace_refs = 0;
143         init_revisions(&revs, prefix);
144
145         argc = parse_options(argc, argv, prefix, options, prune_usage, 0);
146         while (argc--) {
147                 unsigned char sha1[20];
148                 const char *name = *argv++;
149
150                 if (!get_sha1(name, sha1)) {
151                         struct object *object = parse_object(sha1);
152                         if (!object)
153                                 die("bad object: %s", name);
154                         add_pending_object(&revs, object, "");
155                 }
156                 else
157                         die("unrecognized argument: %s", name);
158         }
159
160         if (show_progress == -1)
161                 show_progress = isatty(2);
162         if (show_progress)
163                 progress = start_progress_delay("Checking connectivity", 0, 0, 2);
164
165         mark_reachable_objects(&revs, 1, progress);
166         stop_progress(&progress);
167         prune_object_dir(get_object_directory());
168
169         prune_packed_objects(show_only);
170         remove_temporary_files(get_object_directory());
171         s = xstrdup(mkpath("%s/pack", get_object_directory()));
172         remove_temporary_files(s);
173         free(s);
174         return 0;
175 }