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 time_t rerere_last_used_at(const char *name)
  26 {
  27         struct stat st;
  28         return stat(rerere_path(name, "postimage"), &st) ? (time_t) 0 : st.st_mtime;
  29 }
  30
  31 static void unlink_rr_item(const char *name)
  32 {
  33         unlink(rerere_path(name, "thisimage"));
  34         unlink(rerere_path(name, "preimage"));
  35         unlink(rerere_path(name, "postimage"));
  36         rmdir(git_path("rr-cache/%s", name));
  37 }
  38
  39 static int git_rerere_gc_config(const char *var, const char *value, void *cb)
  40 {
  41         if (!strcmp(var, "gc.rerereresolved"))
  42                 cutoff_resolve = git_config_int(var, value);
  43         else if (!strcmp(var, "gc.rerereunresolved"))
  44                 cutoff_noresolve = git_config_int(var, value);
  45         else
  46                 return git_default_config(var, value, cb);
  47         return 0;
  48 }
  49
  50 static void garbage_collect(struct string_list *rr)
  51 {
  52         struct string_list to_remove = STRING_LIST_INIT_DUP;
  53         DIR *dir;
  54         struct dirent *e;
  55         int i, cutoff;
  56         time_t now = time(NULL), then;
  57
  58         git_config(git_rerere_gc_config, NULL);
  59         dir = opendir(git_path("rr-cache"));
  60         if (!dir)
  61                 die_errno("unable to open rr-cache directory");
  62         while ((e = readdir(dir))) {
  63                 if (is_dot_or_dotdot(e->d_name))
  64                         continue;
  65
  66                 then = rerere_last_used_at(e->d_name);
  67                 if (then) {
  68                         cutoff = cutoff_resolve;
  69                 } else {
  70                         then = rerere_created_at(e->d_name);
  71                         if (!then)
  72                                 continue;
  73                         cutoff = cutoff_noresolve;
  74                 }
  75                 if (then < now - cutoff * 86400)
  76                         string_list_append(&to_remove, e->d_name);
  77         }
  78         for (i = 0; i < to_remove.nr; i++)
  79                 unlink_rr_item(to_remove.items[i].string);
  80         string_list_clear(&to_remove, 0);
  81 }
  82
  83 static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
  84 {
  85         int i;
  86         for (i = 0; i < nbuf; i++)
  87                 if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
  88                         return -1;
  89         return 0;
  90 }
  91
  92 static int diff_two(const char *file1, const char *label1,
  93                 const char *file2, const char *label2)
  94 {
  95         xpparam_t xpp;
  96         xdemitconf_t xecfg;
  97         xdemitcb_t ecb;
  98         mmfile_t minus, plus;
  99
 100         if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
 101                 return 1;
 102
 103         printf("--- a/%s\n+++ b/%s\n", label1, label2);
 104         fflush(stdout);
 105         memset(&xpp, 0, sizeof(xpp));
 106         xpp.flags = 0;
 107         memset(&xecfg, 0, sizeof(xecfg));
 108         xecfg.ctxlen = 3;
 109         ecb.outf = outf;
 110         xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
 111
 112         free(minus.ptr);
 113         free(plus.ptr);
 114         return 0;
 115 }
 116
 117 int cmd_rerere(int argc, const char **argv, const char *prefix)
 118 {
 119         struct string_list merge_rr = STRING_LIST_INIT_DUP;
 120         int i, fd, autoupdate = -1, flags = 0;
 121
 122         struct option options[] = {
 123                 OPT_SET_INT(0, "rerere-autoupdate", &autoupdate,
 124                         "register clean resolutions in index", 1),
 125                 OPT_END(),
 126         };
 127
 128         argc = parse_options(argc, argv, prefix, options, rerere_usage, 0);
 129
 130         if (autoupdate == 1)
 131                 flags = RERERE_AUTOUPDATE;
 132         if (autoupdate == 0)
 133                 flags = RERERE_NOAUTOUPDATE;
 134
 135         if (argc < 1)
 136                 return rerere(flags);
 137
 138         if (!strcmp(argv[0], "forget")) {
 139                 const char **pathspec = get_pathspec(prefix, argv + 1);
 140                 return rerere_forget(pathspec);
 141         }
 142
 143         fd = setup_rerere(&merge_rr, flags);
 144         if (fd < 0)
 145                 return 0;
 146
 147         if (!strcmp(argv[0], "clear")) {
 148                 for (i = 0; i < merge_rr.nr; i++) {
 149                         const char *name = (const char *)merge_rr.items[i].util;
 150                         if (!has_rerere_resolution(name))
 151                                 unlink_rr_item(name);
 152                 }
 153                 unlink_or_warn(git_path("MERGE_RR"));
 154         } else if (!strcmp(argv[0], "gc"))
 155                 garbage_collect(&merge_rr);
 156         else if (!strcmp(argv[0], "status"))
 157                 for (i = 0; i < merge_rr.nr; i++)
 158                         printf("%s\n", merge_rr.items[i].string);
 159         else if (!strcmp(argv[0], "diff"))
 160                 for (i = 0; i < merge_rr.nr; i++) {
 161                         const char *path = merge_rr.items[i].string;
 162                         const char *name = (const char *)merge_rr.items[i].util;
 163                         diff_two(rerere_path(name, "preimage"), path, path, path);
 164                 }
 165         else
 166                 usage_with_options(rerere_usage, options);
 167
 168         string_list_clear(&merge_rr, 1);
 169         return 0;
 170 }