Merge branch 'maint'
[git] / builtin / rerere.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "dir.h"
4 #include "string-list.h"
5 #include "rerere.h"
6 #include "xdiff/xdiff.h"
7 #include "xdiff-interface.h"
8
9 static const char git_rerere_usage[] =
10 "git rerere [clear | status | diff | gc]";
11
12 /* these values are days */
13 static int cutoff_noresolve = 15;
14 static int cutoff_resolve = 60;
15
16 static time_t rerere_created_at(const char *name)
17 {
18         struct stat st;
19         return stat(rerere_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
20 }
21
22 static void unlink_rr_item(const char *name)
23 {
24         unlink(rerere_path(name, "thisimage"));
25         unlink(rerere_path(name, "preimage"));
26         unlink(rerere_path(name, "postimage"));
27         rmdir(git_path("rr-cache/%s", name));
28 }
29
30 static int git_rerere_gc_config(const char *var, const char *value, void *cb)
31 {
32         if (!strcmp(var, "gc.rerereresolved"))
33                 cutoff_resolve = git_config_int(var, value);
34         else if (!strcmp(var, "gc.rerereunresolved"))
35                 cutoff_noresolve = git_config_int(var, value);
36         else
37                 return git_default_config(var, value, cb);
38         return 0;
39 }
40
41 static void garbage_collect(struct string_list *rr)
42 {
43         struct string_list to_remove = { NULL, 0, 0, 1 };
44         DIR *dir;
45         struct dirent *e;
46         int i, cutoff;
47         time_t now = time(NULL), then;
48
49         git_config(git_rerere_gc_config, NULL);
50         dir = opendir(git_path("rr-cache"));
51         if (!dir)
52                 die_errno("unable to open rr-cache directory");
53         while ((e = readdir(dir))) {
54                 if (is_dot_or_dotdot(e->d_name))
55                         continue;
56                 then = rerere_created_at(e->d_name);
57                 if (!then)
58                         continue;
59                 cutoff = (has_rerere_resolution(e->d_name)
60                           ? cutoff_resolve : cutoff_noresolve);
61                 if (then < now - cutoff * 86400)
62                         string_list_append(&to_remove, e->d_name);
63         }
64         for (i = 0; i < to_remove.nr; i++)
65                 unlink_rr_item(to_remove.items[i].string);
66         string_list_clear(&to_remove, 0);
67 }
68
69 static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
70 {
71         int i;
72         for (i = 0; i < nbuf; i++)
73                 if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
74                         return -1;
75         return 0;
76 }
77
78 static int diff_two(const char *file1, const char *label1,
79                 const char *file2, const char *label2)
80 {
81         xpparam_t xpp;
82         xdemitconf_t xecfg;
83         xdemitcb_t ecb;
84         mmfile_t minus, plus;
85
86         if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
87                 return 1;
88
89         printf("--- a/%s\n+++ b/%s\n", label1, label2);
90         fflush(stdout);
91         memset(&xpp, 0, sizeof(xpp));
92         xpp.flags = 0;
93         memset(&xecfg, 0, sizeof(xecfg));
94         xecfg.ctxlen = 3;
95         ecb.outf = outf;
96         xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
97
98         free(minus.ptr);
99         free(plus.ptr);
100         return 0;
101 }
102
103 int cmd_rerere(int argc, const char **argv, const char *prefix)
104 {
105         struct string_list merge_rr = { NULL, 0, 0, 1 };
106         int i, fd, flags = 0;
107
108         if (2 < argc) {
109                 if (!strcmp(argv[1], "-h"))
110                         usage(git_rerere_usage);
111                 if (!strcmp(argv[1], "--rerere-autoupdate"))
112                         flags = RERERE_AUTOUPDATE;
113                 else if (!strcmp(argv[1], "--no-rerere-autoupdate"))
114                         flags = RERERE_NOAUTOUPDATE;
115                 if (flags) {
116                         argc--;
117                         argv++;
118                 }
119         }
120         if (argc < 2)
121                 return rerere(flags);
122
123         if (!strcmp(argv[1], "forget")) {
124                 const char **pathspec = get_pathspec(prefix, argv + 2);
125                 return rerere_forget(pathspec);
126         }
127
128         fd = setup_rerere(&merge_rr, flags);
129         if (fd < 0)
130                 return 0;
131
132         if (!strcmp(argv[1], "clear")) {
133                 for (i = 0; i < merge_rr.nr; i++) {
134                         const char *name = (const char *)merge_rr.items[i].util;
135                         if (!has_rerere_resolution(name))
136                                 unlink_rr_item(name);
137                 }
138                 unlink_or_warn(git_path("rr-cache/MERGE_RR"));
139         } else if (!strcmp(argv[1], "gc"))
140                 garbage_collect(&merge_rr);
141         else if (!strcmp(argv[1], "status"))
142                 for (i = 0; i < merge_rr.nr; i++)
143                         printf("%s\n", merge_rr.items[i].string);
144         else if (!strcmp(argv[1], "diff"))
145                 for (i = 0; i < merge_rr.nr; i++) {
146                         const char *path = merge_rr.items[i].string;
147                         const char *name = (const char *)merge_rr.items[i].util;
148                         diff_two(rerere_path(name, "preimage"), path, path, path);
149                 }
150         else
151                 usage(git_rerere_usage);
152
153         string_list_clear(&merge_rr, 1);
154         return 0;
155 }