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 }