Merge branch 'sr/clone-empty'
[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 const char *rr_path(const char *name, const char *file)
17 {
18         return git_path("rr-cache/%s/%s", name, file);
19 }
20
21 static time_t rerere_created_at(const char *name)
22 {
23         struct stat st;
24         return stat(rr_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
25 }
26
27 static int has_resolution(const char *name)
28 {
29         struct stat st;
30         return !stat(rr_path(name, "postimage"), &st);
31 }
32
33 static void unlink_rr_item(const char *name)
34 {
35         unlink(rr_path(name, "thisimage"));
36         unlink(rr_path(name, "preimage"));
37         unlink(rr_path(name, "postimage"));
38         rmdir(git_path("rr-cache/%s", name));
39 }
40
41 static int git_rerere_gc_config(const char *var, const char *value, void *cb)
42 {
43         if (!strcmp(var, "gc.rerereresolved"))
44                 cutoff_resolve = git_config_int(var, value);
45         else if (!strcmp(var, "gc.rerereunresolved"))
46                 cutoff_noresolve = git_config_int(var, value);
47         else
48                 return git_default_config(var, value, cb);
49         return 0;
50 }
51
52 static void garbage_collect(struct string_list *rr)
53 {
54         struct string_list to_remove = { NULL, 0, 0, 1 };
55         DIR *dir;
56         struct dirent *e;
57         int i, cutoff;
58         time_t now = time(NULL), then;
59
60         git_config(git_rerere_gc_config, NULL);
61         dir = opendir(git_path("rr-cache"));
62         while ((e = readdir(dir))) {
63                 if (is_dot_or_dotdot(e->d_name))
64                         continue;
65                 then = rerere_created_at(e->d_name);
66                 if (!then)
67                         continue;
68                 cutoff = (has_resolution(e->d_name)
69                           ? cutoff_resolve : cutoff_noresolve);
70                 if (then < now - cutoff * 86400)
71                         string_list_append(e->d_name, &to_remove);
72         }
73         for (i = 0; i < to_remove.nr; i++)
74                 unlink_rr_item(to_remove.items[i].string);
75         string_list_clear(&to_remove, 0);
76 }
77
78 static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
79 {
80         int i;
81         for (i = 0; i < nbuf; i++)
82                 if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
83                         return -1;
84         return 0;
85 }
86
87 static int diff_two(const char *file1, const char *label1,
88                 const char *file2, const char *label2)
89 {
90         xpparam_t xpp;
91         xdemitconf_t xecfg;
92         xdemitcb_t ecb;
93         mmfile_t minus, plus;
94
95         if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
96                 return 1;
97
98         printf("--- a/%s\n+++ b/%s\n", label1, label2);
99         fflush(stdout);
100         memset(&xpp, 0, sizeof(xpp));
101         xpp.flags = XDF_NEED_MINIMAL;
102         memset(&xecfg, 0, sizeof(xecfg));
103         xecfg.ctxlen = 3;
104         ecb.outf = outf;
105         xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
106
107         free(minus.ptr);
108         free(plus.ptr);
109         return 0;
110 }
111
112 int cmd_rerere(int argc, const char **argv, const char *prefix)
113 {
114         struct string_list merge_rr = { NULL, 0, 0, 1 };
115         int i, fd;
116
117         if (argc < 2)
118                 return rerere();
119
120         fd = setup_rerere(&merge_rr);
121         if (fd < 0)
122                 return 0;
123
124         if (!strcmp(argv[1], "clear")) {
125                 for (i = 0; i < merge_rr.nr; i++) {
126                         const char *name = (const char *)merge_rr.items[i].util;
127                         if (!has_resolution(name))
128                                 unlink_rr_item(name);
129                 }
130                 unlink(git_path("rr-cache/MERGE_RR"));
131         } else if (!strcmp(argv[1], "gc"))
132                 garbage_collect(&merge_rr);
133         else if (!strcmp(argv[1], "status"))
134                 for (i = 0; i < merge_rr.nr; i++)
135                         printf("%s\n", merge_rr.items[i].string);
136         else if (!strcmp(argv[1], "diff"))
137                 for (i = 0; i < merge_rr.nr; i++) {
138                         const char *path = merge_rr.items[i].string;
139                         const char *name = (const char *)merge_rr.items[i].util;
140                         diff_two(rr_path(name, "preimage"), path, path, path);
141                 }
142         else
143                 usage(git_rerere_usage);
144
145         string_list_clear(&merge_rr, 1);
146         return 0;
147 }