Merge branch 'svn-fe' of git://repo.or.cz/git/jrn
[git] / builtin / rerere.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "dir.h"
4 #include "parse-options.h"
5 #include "string-list.h"
6 #include "rerere.h"
7 #include "xdiff/xdiff.h"
8 #include "xdiff-interface.h"
9
10 static const char * const rerere_usage[] = {
11         "git rerere [clear | forget path... | status | remaining | diff | gc]",
12         NULL,
13 };
14
15 /* these values are days */
16 static int cutoff_noresolve = 15;
17 static int cutoff_resolve = 60;
18
19 static time_t rerere_created_at(const char *name)
20 {
21         struct stat st;
22         return stat(rerere_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
23 }
24
25 static time_t rerere_last_used_at(const char *name)
26 {
27         struct stat st;
28         return stat(rerere_path(name, "postimage"), &st) ? (time_t) 0 : st.st_mtime;
29 }
30
31 static void unlink_rr_item(const char *name)
32 {
33         unlink(rerere_path(name, "thisimage"));
34         unlink(rerere_path(name, "preimage"));
35         unlink(rerere_path(name, "postimage"));
36         rmdir(git_path("rr-cache/%s", name));
37 }
38
39 static int git_rerere_gc_config(const char *var, const char *value, void *cb)
40 {
41         if (!strcmp(var, "gc.rerereresolved"))
42                 cutoff_resolve = git_config_int(var, value);
43         else if (!strcmp(var, "gc.rerereunresolved"))
44                 cutoff_noresolve = git_config_int(var, value);
45         else
46                 return git_default_config(var, value, cb);
47         return 0;
48 }
49
50 static void garbage_collect(struct string_list *rr)
51 {
52         struct string_list to_remove = STRING_LIST_INIT_DUP;
53         DIR *dir;
54         struct dirent *e;
55         int i, cutoff;
56         time_t now = time(NULL), then;
57
58         git_config(git_rerere_gc_config, NULL);
59         dir = opendir(git_path("rr-cache"));
60         if (!dir)
61                 die_errno("unable to open rr-cache directory");
62         while ((e = readdir(dir))) {
63                 if (is_dot_or_dotdot(e->d_name))
64                         continue;
65
66                 then = rerere_last_used_at(e->d_name);
67                 if (then) {
68                         cutoff = cutoff_resolve;
69                 } else {
70                         then = rerere_created_at(e->d_name);
71                         if (!then)
72                                 continue;
73                         cutoff = cutoff_noresolve;
74                 }
75                 if (then < now - cutoff * 86400)
76                         string_list_append(&to_remove, e->d_name);
77         }
78         for (i = 0; i < to_remove.nr; i++)
79                 unlink_rr_item(to_remove.items[i].string);
80         string_list_clear(&to_remove, 0);
81 }
82
83 static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
84 {
85         int i;
86         for (i = 0; i < nbuf; i++)
87                 if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
88                         return -1;
89         return 0;
90 }
91
92 static int diff_two(const char *file1, const char *label1,
93                 const char *file2, const char *label2)
94 {
95         xpparam_t xpp;
96         xdemitconf_t xecfg;
97         xdemitcb_t ecb;
98         mmfile_t minus, plus;
99
100         if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
101                 return 1;
102
103         printf("--- a/%s\n+++ b/%s\n", label1, label2);
104         fflush(stdout);
105         memset(&xpp, 0, sizeof(xpp));
106         xpp.flags = 0;
107         memset(&xecfg, 0, sizeof(xecfg));
108         xecfg.ctxlen = 3;
109         ecb.outf = outf;
110         xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
111
112         free(minus.ptr);
113         free(plus.ptr);
114         return 0;
115 }
116
117 int cmd_rerere(int argc, const char **argv, const char *prefix)
118 {
119         struct string_list merge_rr = STRING_LIST_INIT_DUP;
120         int i, fd, autoupdate = -1, flags = 0;
121
122         struct option options[] = {
123                 OPT_SET_INT(0, "rerere-autoupdate", &autoupdate,
124                         "register clean resolutions in index", 1),
125                 OPT_END(),
126         };
127
128         argc = parse_options(argc, argv, prefix, options, rerere_usage, 0);
129
130         if (autoupdate == 1)
131                 flags = RERERE_AUTOUPDATE;
132         if (autoupdate == 0)
133                 flags = RERERE_NOAUTOUPDATE;
134
135         if (argc < 1)
136                 return rerere(flags);
137
138         if (!strcmp(argv[0], "forget")) {
139                 const char **pathspec;
140                 if (argc < 2)
141                         warning("'git rerere forget' without paths is deprecated");
142                 pathspec = get_pathspec(prefix, argv + 1);
143                 return rerere_forget(pathspec);
144         }
145
146         fd = setup_rerere(&merge_rr, flags);
147         if (fd < 0)
148                 return 0;
149
150         if (!strcmp(argv[0], "clear")) {
151                 for (i = 0; i < merge_rr.nr; i++) {
152                         const char *name = (const char *)merge_rr.items[i].util;
153                         if (!has_rerere_resolution(name))
154                                 unlink_rr_item(name);
155                 }
156                 unlink_or_warn(git_path("MERGE_RR"));
157         } else if (!strcmp(argv[0], "gc"))
158                 garbage_collect(&merge_rr);
159         else if (!strcmp(argv[0], "status"))
160                 for (i = 0; i < merge_rr.nr; i++)
161                         printf("%s\n", merge_rr.items[i].string);
162         else if (!strcmp(argv[0], "remaining")) {
163                 rerere_remaining(&merge_rr);
164                 for (i = 0; i < merge_rr.nr; i++) {
165                         if (merge_rr.items[i].util != RERERE_RESOLVED)
166                                 printf("%s\n", merge_rr.items[i].string);
167                         else
168                                 /* prepare for later call to
169                                  * string_list_clear() */
170                                 merge_rr.items[i].util = NULL;
171                 }
172         } else if (!strcmp(argv[0], "diff"))
173                 for (i = 0; i < merge_rr.nr; i++) {
174                         const char *path = merge_rr.items[i].string;
175                         const char *name = (const char *)merge_rr.items[i].util;
176                         diff_two(rerere_path(name, "preimage"), path, path, path);
177                 }
178         else
179                 usage_with_options(rerere_usage, options);
180
181         string_list_clear(&merge_rr, 1);
182         return 0;
183 }