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 time_t rerere_last_used_at(const char *name)
  23 {
  24         struct stat st;
  25         return stat(rerere_path(name, "postimage"), &st) ? (time_t) 0 : st.st_mtime;
  26 }
  27
  28 static void unlink_rr_item(const char *name)
  29 {
  30         unlink(rerere_path(name, "thisimage"));
  31         unlink(rerere_path(name, "preimage"));
  32         unlink(rerere_path(name, "postimage"));
  33         rmdir(git_path("rr-cache/%s", name));
  34 }
  35
  36 static int git_rerere_gc_config(const char *var, const char *value, void *cb)
  37 {
  38         if (!strcmp(var, "gc.rerereresolved"))
  39                 cutoff_resolve = git_config_int(var, value);
  40         else if (!strcmp(var, "gc.rerereunresolved"))
  41                 cutoff_noresolve = git_config_int(var, value);
  42         else
  43                 return git_default_config(var, value, cb);
  44         return 0;
  45 }
  46
  47 static void garbage_collect(struct string_list *rr)
  48 {
  49         struct string_list to_remove = { NULL, 0, 0, 1 };
  50         DIR *dir;
  51         struct dirent *e;
  52         int i, cutoff;
  53         time_t now = time(NULL), then;
  54
  55         git_config(git_rerere_gc_config, NULL);
  56         dir = opendir(git_path("rr-cache"));
  57         if (!dir)
  58                 die_errno("unable to open rr-cache directory");
  59         while ((e = readdir(dir))) {
  60                 if (is_dot_or_dotdot(e->d_name))
  61                         continue;
  62
  63                 then = rerere_last_used_at(e->d_name);
  64                 if (then) {
  65                         cutoff = cutoff_resolve;
  66                 } else {
  67                         then = rerere_created_at(e->d_name);
  68                         if (!then)
  69                                 continue;
  70                         cutoff = cutoff_noresolve;
  71                 }
  72                 if (then < now - cutoff * 86400)
  73                         string_list_append(&to_remove, e->d_name);
  74         }
  75         for (i = 0; i < to_remove.nr; i++)
  76                 unlink_rr_item(to_remove.items[i].string);
  77         string_list_clear(&to_remove, 0);
  78 }
  79
  80 static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
  81 {
  82         int i;
  83         for (i = 0; i < nbuf; i++)
  84                 if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
  85                         return -1;
  86         return 0;
  87 }
  88
  89 static int diff_two(const char *file1, const char *label1,
  90                 const char *file2, const char *label2)
  91 {
  92         xpparam_t xpp;
  93         xdemitconf_t xecfg;
  94         xdemitcb_t ecb;
  95         mmfile_t minus, plus;
  96
  97         if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
  98                 return 1;
  99
 100         printf("--- a/%s\n+++ b/%s\n", label1, label2);
 101         fflush(stdout);
 102         memset(&xpp, 0, sizeof(xpp));
 103         xpp.flags = 0;
 104         memset(&xecfg, 0, sizeof(xecfg));
 105         xecfg.ctxlen = 3;
 106         ecb.outf = outf;
 107         xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
 108
 109         free(minus.ptr);
 110         free(plus.ptr);
 111         return 0;
 112 }
 113
 114 int cmd_rerere(int argc, const char **argv, const char *prefix)
 115 {
 116         struct string_list merge_rr = { NULL, 0, 0, 1 };
 117         int i, fd, flags = 0;
 118
 119         if (2 < argc) {
 120                 if (!strcmp(argv[1], "-h"))
 121                         usage(git_rerere_usage);
 122                 if (!strcmp(argv[1], "--rerere-autoupdate"))
 123                         flags = RERERE_AUTOUPDATE;
 124                 else if (!strcmp(argv[1], "--no-rerere-autoupdate"))
 125                         flags = RERERE_NOAUTOUPDATE;
 126                 if (flags) {
 127                         argc--;
 128                         argv++;
 129                 }
 130         }
 131         if (argc < 2)
 132                 return rerere(flags);
 133
 134         if (!strcmp(argv[1], "forget")) {
 135                 const char **pathspec = get_pathspec(prefix, argv + 2);
 136                 return rerere_forget(pathspec);
 137         }
 138
 139         fd = setup_rerere(&merge_rr, flags);
 140         if (fd < 0)
 141                 return 0;
 142
 143         if (!strcmp(argv[1], "clear")) {
 144                 for (i = 0; i < merge_rr.nr; i++) {
 145                         const char *name = (const char *)merge_rr.items[i].util;
 146                         if (!has_rerere_resolution(name))
 147                                 unlink_rr_item(name);
 148                 }
 149                 unlink_or_warn(git_path("MERGE_RR"));
 150         } else if (!strcmp(argv[1], "gc"))
 151                 garbage_collect(&merge_rr);
 152         else if (!strcmp(argv[1], "status"))
 153                 for (i = 0; i < merge_rr.nr; i++)
 154                         printf("%s\n", merge_rr.items[i].string);
 155         else if (!strcmp(argv[1], "diff"))
 156                 for (i = 0; i < merge_rr.nr; i++) {
 157                         const char *path = merge_rr.items[i].string;
 158                         const char *name = (const char *)merge_rr.items[i].util;
 159                         diff_two(rerere_path(name, "preimage"), path, path, path);
 160                 }
 161         else
 162                 usage(git_rerere_usage);
 163
 164         string_list_clear(&merge_rr, 1);
 165         return 0;
 166 }