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 | status | 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 void unlink_rr_item(const char *name)
  26 {
  27         unlink(rerere_path(name, "thisimage"));
  28         unlink(rerere_path(name, "preimage"));
  29         unlink(rerere_path(name, "postimage"));
  30         rmdir(git_path("rr-cache/%s", name));
  31 }
  32
  33 static int git_rerere_gc_config(const char *var, const char *value, void *cb)
  34 {
  35         if (!strcmp(var, "gc.rerereresolved"))
  36                 cutoff_resolve = git_config_int(var, value);
  37         else if (!strcmp(var, "gc.rerereunresolved"))
  38                 cutoff_noresolve = git_config_int(var, value);
  39         else
  40                 return git_default_config(var, value, cb);
  41         return 0;
  42 }
  43
  44 static void garbage_collect(struct string_list *rr)
  45 {
  46         struct string_list to_remove = { NULL, 0, 0, 1 };
  47         DIR *dir;
  48         struct dirent *e;
  49         int i, cutoff;
  50         time_t now = time(NULL), then;
  51
  52         git_config(git_rerere_gc_config, NULL);
  53         dir = opendir(git_path("rr-cache"));
  54         if (!dir)
  55                 die_errno("unable to open rr-cache directory");
  56         while ((e = readdir(dir))) {
  57                 if (is_dot_or_dotdot(e->d_name))
  58                         continue;
  59                 then = rerere_created_at(e->d_name);
  60                 if (!then)
  61                         continue;
  62                 cutoff = (has_rerere_resolution(e->d_name)
  63                           ? cutoff_resolve : cutoff_noresolve);
  64                 if (then < now - cutoff * 86400)
  65                         string_list_append(e->d_name, &to_remove);
  66         }
  67         for (i = 0; i < to_remove.nr; i++)
  68                 unlink_rr_item(to_remove.items[i].string);
  69         string_list_clear(&to_remove, 0);
  70 }
  71
  72 static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
  73 {
  74         int i;
  75         for (i = 0; i < nbuf; i++)
  76                 if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
  77                         return -1;
  78         return 0;
  79 }
  80
  81 static int diff_two(const char *file1, const char *label1,
  82                 const char *file2, const char *label2)
  83 {
  84         xpparam_t xpp;
  85         xdemitconf_t xecfg;
  86         xdemitcb_t ecb;
  87         mmfile_t minus, plus;
  88
  89         if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
  90                 return 1;
  91
  92         printf("--- a/%s\n+++ b/%s\n", label1, label2);
  93         fflush(stdout);
  94         memset(&xpp, 0, sizeof(xpp));
  95         xpp.flags = 0;
  96         memset(&xecfg, 0, sizeof(xecfg));
  97         xecfg.ctxlen = 3;
  98         ecb.outf = outf;
  99         xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
 100
 101         free(minus.ptr);
 102         free(plus.ptr);
 103         return 0;
 104 }
 105
 106 int cmd_rerere(int argc, const char **argv, const char *prefix)
 107 {
 108         struct string_list merge_rr = { NULL, 0, 0, 1 };
 109         int i, fd, autoupdate = -1, flags = 0;
 110
 111         struct option options[] = {
 112                 OPT_SET_INT(0, "rerere-autoupdate", &autoupdate,
 113                         "register clean resolutions in index", 1),
 114                 OPT_END(),
 115         };
 116
 117         argc = parse_options(argc, argv, prefix, options, rerere_usage, 0);
 118
 119         if (autoupdate == 1)
 120                 flags = RERERE_AUTOUPDATE;
 121         if (autoupdate == 0)
 122                 flags = RERERE_NOAUTOUPDATE;
 123
 124         if (argc < 1)
 125                 return rerere(flags);
 126
 127         if (!strcmp(argv[0], "forget")) {
 128                 const char **pathspec = get_pathspec(prefix, argv + 1);
 129                 return rerere_forget(pathspec);
 130         }
 131
 132         fd = setup_rerere(&merge_rr, flags);
 133         if (fd < 0)
 134                 return 0;
 135
 136         if (!strcmp(argv[0], "clear")) {
 137                 for (i = 0; i < merge_rr.nr; i++) {
 138                         const char *name = (const char *)merge_rr.items[i].util;
 139                         if (!has_rerere_resolution(name))
 140                                 unlink_rr_item(name);
 141                 }
 142                 unlink_or_warn(git_path("rr-cache/MERGE_RR"));
 143         } else if (!strcmp(argv[0], "gc"))
 144                 garbage_collect(&merge_rr);
 145         else if (!strcmp(argv[0], "status"))
 146                 for (i = 0; i < merge_rr.nr; i++)
 147                         printf("%s\n", merge_rr.items[i].string);
 148         else if (!strcmp(argv[0], "diff"))
 149                 for (i = 0; i < merge_rr.nr; i++) {
 150                         const char *path = merge_rr.items[i].string;
 151                         const char *name = (const char *)merge_rr.items[i].util;
 152                         diff_two(rerere_path(name, "preimage"), path, path, path);
 153                 }
 154         else
 155                 usage_with_options(rerere_usage, options);
 156
 157         string_list_clear(&merge_rr, 1);
 158         return 0;
 159 }