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 = XDF_NEED_MINIMAL;
  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 }