Andrew's git - gitweb.git/blob

   1#include "builtin.h"
   2#include "cache.h"
   3#include "string-list.h"
   4#include "rerere.h"
   5#include "xdiff/xdiff.h"
   6#include "xdiff-interface.h"
   7
   8static const char git_rerere_usage[] =
   9"git rerere [clear | status | diff | gc]";
  10
  11/* these values are days */
  12static int cutoff_noresolve = 15;
  13static int cutoff_resolve = 60;
  14
  15static const char *rr_path(const char *name, const char *file)
  16{
  17        return git_path("rr-cache/%s/%s", name, file);
  18}
  19
  20static time_t rerere_created_at(const char *name)
  21{
  22        struct stat st;
  23        return stat(rr_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
  24}
  25
  26static int has_resolution(const char *name)
  27{
  28        struct stat st;
  29        return !stat(rr_path(name, "postimage"), &st);
  30}
  31
  32static void unlink_rr_item(const char *name)
  33{
  34        unlink(rr_path(name, "thisimage"));
  35        unlink(rr_path(name, "preimage"));
  36        unlink(rr_path(name, "postimage"));
  37        rmdir(git_path("rr-cache/%s", name));
  38}
  39
  40static int git_rerere_gc_config(const char *var, const char *value, void *cb)
  41{
  42        if (!strcmp(var, "gc.rerereresolved"))
  43                cutoff_resolve = git_config_int(var, value);
  44        else if (!strcmp(var, "gc.rerereunresolved"))
  45                cutoff_noresolve = git_config_int(var, value);
  46        else
  47                return git_default_config(var, value, cb);
  48        return 0;
  49}
  50
  51static void garbage_collect(struct string_list *rr)
  52{
  53        struct string_list to_remove = { NULL, 0, 0, 1 };
  54        DIR *dir;
  55        struct dirent *e;
  56        int i, cutoff;
  57        time_t now = time(NULL), then;
  58
  59        git_config(git_rerere_gc_config, NULL);
  60        dir = opendir(git_path("rr-cache"));
  61        while ((e = readdir(dir))) {
  62                const char *name = e->d_name;
  63                if (name[0] == '.' &&
  64                    (name[1] == '\0' || (name[1] == '.' && name[2] == '\0')))
  65                        continue;
  66                then = rerere_created_at(name);
  67                if (!then)
  68                        continue;
  69                cutoff = (has_resolution(name)
  70                          ? cutoff_resolve : cutoff_noresolve);
  71                if (then < now - cutoff * 86400)
  72                        string_list_append(name, &to_remove);
  73        }
  74        for (i = 0; i < to_remove.nr; i++)
  75                unlink_rr_item(to_remove.items[i].string);
  76        string_list_clear(&to_remove, 0);
  77}
  78
  79static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
  80{
  81        int i;
  82        for (i = 0; i < nbuf; i++)
  83                if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
  84                        return -1;
  85        return 0;
  86}
  87
  88static int diff_two(const char *file1, const char *label1,
  89                const char *file2, const char *label2)
  90{
  91        xpparam_t xpp;
  92        xdemitconf_t xecfg;
  93        xdemitcb_t ecb;
  94        mmfile_t minus, plus;
  95
  96        if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
  97                return 1;
  98
  99        printf("--- a/%s\n+++ b/%s\n", label1, label2);
 100        fflush(stdout);
 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
 112int 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}