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#include "builtin.h"
#include "cache.h"
#include "path-list.h"
#include "rerere.h"
#include "xdiff/xdiff.h"
#include "xdiff-interface.h"
static const char git_rerere_usage[] =
"git-rerere [clear | status | diff | gc]";
/* these values are days */
static int cutoff_noresolve = 15;
static int cutoff_resolve = 60;
static const char *rr_path(const char *name, const char *file)
{
return git_path("rr-cache/%s/%s", name, file);
}
static time_t rerere_created_at(const char *name)
{
struct stat st;
return stat(rr_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
}
static int has_resolution(const char *name)
{
struct stat st;
return !stat(rr_path(name, "postimage"), &st);
}
static void unlink_rr_item(const char *name)
{
unlink(rr_path(name, "thisimage"));
unlink(rr_path(name, "preimage"));
unlink(rr_path(name, "postimage"));
rmdir(git_path("rr-cache/%s", name));
}
static int git_rerere_gc_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "gc.rerereresolved"))
cutoff_resolve = git_config_int(var, value);
else if (!strcmp(var, "gc.rerereunresolved"))
cutoff_noresolve = git_config_int(var, value);
else
return git_default_config(var, value, cb);
return 0;
}
static void garbage_collect(struct path_list *rr)
{
struct path_list to_remove = { NULL, 0, 0, 1 };
DIR *dir;
struct dirent *e;
int i, cutoff;
time_t now = time(NULL), then;
git_config(git_rerere_gc_config, NULL);
dir = opendir(git_path("rr-cache"));
while ((e = readdir(dir))) {
const char *name = e->d_name;
if (name[0] == '.' &&
(name[1] == '\0' || (name[1] == '.' && name[2] == '\0')))
continue;
then = rerere_created_at(name);
if (!then)
continue;
cutoff = (has_resolution(name)
? cutoff_resolve : cutoff_noresolve);
if (then < now - cutoff * 86400)
path_list_append(name, &to_remove);
}
for (i = 0; i < to_remove.nr; i++)
unlink_rr_item(to_remove.items[i].path);
path_list_clear(&to_remove, 0);
}
static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
{
int i;
for (i = 0; i < nbuf; i++)
if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
return -1;
return 0;
}
static int diff_two(const char *file1, const char *label1,
const char *file2, const char *label2)
{
xpparam_t xpp;
xdemitconf_t xecfg;
xdemitcb_t ecb;
mmfile_t minus, plus;
if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
return 1;
printf("--- a/%s\n+++ b/%s\n", label1, label2);
fflush(stdout);
xpp.flags = XDF_NEED_MINIMAL;
memset(&xecfg, 0, sizeof(xecfg));
xecfg.ctxlen = 3;
ecb.outf = outf;
xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
free(minus.ptr);
free(plus.ptr);
return 0;
}
int cmd_rerere(int argc, const char **argv, const char *prefix)
{
struct path_list merge_rr = { NULL, 0, 0, 1 };
int i, fd;
if (argc < 2)
return rerere();
fd = setup_rerere(&merge_rr);
if (fd < 0)
return 0;
if (!strcmp(argv[1], "clear")) {
for (i = 0; i < merge_rr.nr; i++) {
const char *name = (const char *)merge_rr.items[i].util;
if (!has_resolution(name))
unlink_rr_item(name);
}
unlink(git_path("rr-cache/MERGE_RR"));
} else if (!strcmp(argv[1], "gc"))
garbage_collect(&merge_rr);
else if (!strcmp(argv[1], "status"))
for (i = 0; i < merge_rr.nr; i++)
printf("%s\n", merge_rr.items[i].path);
else if (!strcmp(argv[1], "diff"))
for (i = 0; i < merge_rr.nr; i++) {
const char *path = merge_rr.items[i].path;
const char *name = (const char *)merge_rr.items[i].util;
diff_two(rr_path(name, "preimage"), path, path, path);
}
else
usage(git_rerere_usage);
path_list_clear(&merge_rr, 1);
return 0;
}
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