Andrew's git / gitweb.git / rerere.c
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rerere.con commit rerere: report autoupdated paths only after actually updating them (a14c7ab)
   1#include "cache.h"
   2#include "lockfile.h"
   3#include "string-list.h"
   4#include "rerere.h"
   5#include "xdiff-interface.h"
   6#include "dir.h"
   7#include "resolve-undo.h"
   8#include "ll-merge.h"
   9#include "attr.h"
  10#include "pathspec.h"
  11
  12#define RESOLVED 0
  13#define PUNTED 1
  14#define THREE_STAGED 2
  15void *RERERE_RESOLVED = &RERERE_RESOLVED;
  16
  17/* if rerere_enabled == -1, fall back to detection of .git/rr-cache */
  18static int rerere_enabled = -1;
  19
  20/* automatically update cleanly resolved paths to the index */
  21static int rerere_autoupdate;
  22
  23static char *merge_rr_path;
  24
  25const char *rerere_path(const char *hex, const char *file)
  26{
  27        return git_path("rr-cache/%s/%s", hex, file);
  28}
  29
  30static int has_rerere_resolution(const char *hex)
  31{
  32        struct stat st;
  33        return !stat(rerere_path(hex, "postimage"), &st);
  34}
  35
  36static void read_rr(struct string_list *rr)
  37{
  38        struct strbuf buf = STRBUF_INIT;
  39        FILE *in = fopen(merge_rr_path, "r");
  40
  41        if (!in)
  42                return;
  43        while (!strbuf_getwholeline(&buf, in, '\0')) {
  44                char *path;
  45                unsigned char sha1[20];
  46
  47                /* There has to be the hash, tab, path and then NUL */
  48                if (buf.len < 42 || get_sha1_hex(buf.buf, sha1))
  49                        die("corrupt MERGE_RR");
  50
  51                if (buf.buf[40] != '\t')
  52                        die("corrupt MERGE_RR");
  53                buf.buf[40] = '\0';
  54                path = buf.buf + 41;
  55
  56                string_list_insert(rr, path)->util = xstrdup(buf.buf);
  57        }
  58        strbuf_release(&buf);
  59        fclose(in);
  60}
  61
  62static struct lock_file write_lock;
  63
  64static int write_rr(struct string_list *rr, int out_fd)
  65{
  66        int i;
  67        for (i = 0; i < rr->nr; i++) {
  68                struct strbuf buf = STRBUF_INIT;
  69
  70                assert(rr->items[i].util != RERERE_RESOLVED);
  71                if (!rr->items[i].util)
  72                        continue;
  73                strbuf_addf(&buf, "%s\t%s%c",
  74                            (char *)rr->items[i].util,
  75                            rr->items[i].string, 0);
  76                if (write_in_full(out_fd, buf.buf, buf.len) != buf.len)
  77                        die("unable to write rerere record");
  78
  79                strbuf_release(&buf);
  80        }
  81        if (commit_lock_file(&write_lock) != 0)
  82                die("unable to write rerere record");
  83        return 0;
  84}
  85
  86static void ferr_write(const void *p, size_t count, FILE *fp, int *err)
  87{
  88        if (!count || *err)
  89                return;
  90        if (fwrite(p, count, 1, fp) != 1)
  91                *err = errno;
  92}
  93
  94static inline void ferr_puts(const char *s, FILE *fp, int *err)
  95{
  96        ferr_write(s, strlen(s), fp, err);
  97}
  98
  99struct rerere_io {
 100        int (*getline)(struct strbuf *, struct rerere_io *);
 101        FILE *output;
 102        int wrerror;
 103        /* some more stuff */
 104};
 105
 106static void rerere_io_putstr(const char *str, struct rerere_io *io)
 107{
 108        if (io->output)
 109                ferr_puts(str, io->output, &io->wrerror);
 110}
 111
 112static void rerere_io_putconflict(int ch, int size, struct rerere_io *io)
 113{
 114        char buf[64];
 115
 116        while (size) {
 117                if (size < sizeof(buf) - 2) {
 118                        memset(buf, ch, size);
 119                        buf[size] = '\n';
 120                        buf[size + 1] = '\0';
 121                        size = 0;
 122                } else {
 123                        int sz = sizeof(buf) - 1;
 124                        if (size <= sz)
 125                                sz -= (sz - size) + 1;
 126                        memset(buf, ch, sz);
 127                        buf[sz] = '\0';
 128                        size -= sz;
 129                }
 130                rerere_io_putstr(buf, io);
 131        }
 132}
 133
 134static void rerere_io_putmem(const char *mem, size_t sz, struct rerere_io *io)
 135{
 136        if (io->output)
 137                ferr_write(mem, sz, io->output, &io->wrerror);
 138}
 139
 140struct rerere_io_file {
 141        struct rerere_io io;
 142        FILE *input;
 143};
 144
 145static int rerere_file_getline(struct strbuf *sb, struct rerere_io *io_)
 146{
 147        struct rerere_io_file *io = (struct rerere_io_file *)io_;
 148        return strbuf_getwholeline(sb, io->input, '\n');
 149}
 150
 151static int is_cmarker(char *buf, int marker_char, int marker_size, int want_sp)
 152{
 153        while (marker_size--)
 154                if (*buf++ != marker_char)
 155                        return 0;
 156        if (want_sp && *buf != ' ')
 157                return 0;
 158        return isspace(*buf);
 159}
 160
 161static int handle_path(unsigned char *sha1, struct rerere_io *io, int marker_size)
 162{
 163        git_SHA_CTX ctx;
 164        int hunk_no = 0;
 165        enum {
 166                RR_CONTEXT = 0, RR_SIDE_1, RR_SIDE_2, RR_ORIGINAL
 167        } hunk = RR_CONTEXT;
 168        struct strbuf one = STRBUF_INIT, two = STRBUF_INIT;
 169        struct strbuf buf = STRBUF_INIT;
 170
 171        if (sha1)
 172                git_SHA1_Init(&ctx);
 173
 174        while (!io->getline(&buf, io)) {
 175                if (is_cmarker(buf.buf, '<', marker_size, 1)) {
 176                        if (hunk != RR_CONTEXT)
 177                                goto bad;
 178                        hunk = RR_SIDE_1;
 179                } else if (is_cmarker(buf.buf, '|', marker_size, 0)) {
 180                        if (hunk != RR_SIDE_1)
 181                                goto bad;
 182                        hunk = RR_ORIGINAL;
 183                } else if (is_cmarker(buf.buf, '=', marker_size, 0)) {
 184                        if (hunk != RR_SIDE_1 && hunk != RR_ORIGINAL)
 185                                goto bad;
 186                        hunk = RR_SIDE_2;
 187                } else if (is_cmarker(buf.buf, '>', marker_size, 1)) {
 188                        if (hunk != RR_SIDE_2)
 189                                goto bad;
 190                        if (strbuf_cmp(&one, &two) > 0)
 191                                strbuf_swap(&one, &two);
 192                        hunk_no++;
 193                        hunk = RR_CONTEXT;
 194                        rerere_io_putconflict('<', marker_size, io);
 195                        rerere_io_putmem(one.buf, one.len, io);
 196                        rerere_io_putconflict('=', marker_size, io);
 197                        rerere_io_putmem(two.buf, two.len, io);
 198                        rerere_io_putconflict('>', marker_size, io);
 199                        if (sha1) {
 200                                git_SHA1_Update(&ctx, one.buf ? one.buf : "",
 201                                            one.len + 1);
 202                                git_SHA1_Update(&ctx, two.buf ? two.buf : "",
 203                                            two.len + 1);
 204                        }
 205                        strbuf_reset(&one);
 206                        strbuf_reset(&two);
 207                } else if (hunk == RR_SIDE_1)
 208                        strbuf_addbuf(&one, &buf);
 209                else if (hunk == RR_ORIGINAL)
 210                        ; /* discard */
 211                else if (hunk == RR_SIDE_2)
 212                        strbuf_addbuf(&two, &buf);
 213                else
 214                        rerere_io_putstr(buf.buf, io);
 215                continue;
 216        bad:
 217                hunk = 99; /* force error exit */
 218                break;
 219        }
 220        strbuf_release(&one);
 221        strbuf_release(&two);
 222        strbuf_release(&buf);
 223
 224        if (sha1)
 225                git_SHA1_Final(sha1, &ctx);
 226        if (hunk != RR_CONTEXT)
 227                return -1;
 228        return hunk_no;
 229}
 230
 231static int handle_file(const char *path, unsigned char *sha1, const char *output)
 232{
 233        int hunk_no = 0;
 234        struct rerere_io_file io;
 235        int marker_size = ll_merge_marker_size(path);
 236
 237        memset(&io, 0, sizeof(io));
 238        io.io.getline = rerere_file_getline;
 239        io.input = fopen(path, "r");
 240        io.io.wrerror = 0;
 241        if (!io.input)
 242                return error("Could not open %s", path);
 243
 244        if (output) {
 245                io.io.output = fopen(output, "w");
 246                if (!io.io.output) {
 247                        fclose(io.input);
 248                        return error("Could not write %s", output);
 249                }
 250        }
 251
 252        hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
 253
 254        fclose(io.input);
 255        if (io.io.wrerror)
 256                error("There were errors while writing %s (%s)",
 257                      path, strerror(io.io.wrerror));
 258        if (io.io.output && fclose(io.io.output))
 259                io.io.wrerror = error("Failed to flush %s: %s",
 260                                      path, strerror(errno));
 261
 262        if (hunk_no < 0) {
 263                if (output)
 264                        unlink_or_warn(output);
 265                return error("Could not parse conflict hunks in %s", path);
 266        }
 267        if (io.io.wrerror)
 268                return -1;
 269        return hunk_no;
 270}
 271
 272struct rerere_io_mem {
 273        struct rerere_io io;
 274        struct strbuf input;
 275};
 276
 277static int rerere_mem_getline(struct strbuf *sb, struct rerere_io *io_)
 278{
 279        struct rerere_io_mem *io = (struct rerere_io_mem *)io_;
 280        char *ep;
 281        size_t len;
 282
 283        strbuf_release(sb);
 284        if (!io->input.len)
 285                return -1;
 286        ep = memchr(io->input.buf, '\n', io->input.len);
 287        if (!ep)
 288                ep = io->input.buf + io->input.len;
 289        else if (*ep == '\n')
 290                ep++;
 291        len = ep - io->input.buf;
 292        strbuf_add(sb, io->input.buf, len);
 293        strbuf_remove(&io->input, 0, len);
 294        return 0;
 295}
 296
 297static int handle_cache(const char *path, unsigned char *sha1, const char *output)
 298{
 299        mmfile_t mmfile[3] = {{NULL}};
 300        mmbuffer_t result = {NULL, 0};
 301        const struct cache_entry *ce;
 302        int pos, len, i, hunk_no;
 303        struct rerere_io_mem io;
 304        int marker_size = ll_merge_marker_size(path);
 305
 306        /*
 307         * Reproduce the conflicted merge in-core
 308         */
 309        len = strlen(path);
 310        pos = cache_name_pos(path, len);
 311        if (0 <= pos)
 312                return -1;
 313        pos = -pos - 1;
 314
 315        for (i = 0; i < 3; i++) {
 316                enum object_type type;
 317                unsigned long size;
 318                int j;
 319
 320                if (active_nr <= pos)
 321                        break;
 322                ce = active_cache[pos++];
 323                if (ce_namelen(ce) != len || memcmp(ce->name, path, len))
 324                        continue;
 325                j = ce_stage(ce) - 1;
 326                mmfile[j].ptr = read_sha1_file(ce->sha1, &type, &size);
 327                mmfile[j].size = size;
 328        }
 329        for (i = 0; i < 3; i++) {
 330                if (!mmfile[i].ptr && !mmfile[i].size)
 331                        mmfile[i].ptr = xstrdup("");
 332        }
 333        /*
 334         * NEEDSWORK: handle conflicts from merges with
 335         * merge.renormalize set, too
 336         */
 337        ll_merge(&result, path, &mmfile[0], NULL,
 338                 &mmfile[1], "ours",
 339                 &mmfile[2], "theirs", NULL);
 340        for (i = 0; i < 3; i++)
 341                free(mmfile[i].ptr);
 342
 343        memset(&io, 0, sizeof(io));
 344        io.io.getline = rerere_mem_getline;
 345        if (output)
 346                io.io.output = fopen(output, "w");
 347        else
 348                io.io.output = NULL;
 349        strbuf_init(&io.input, 0);
 350        strbuf_attach(&io.input, result.ptr, result.size, result.size);
 351
 352        hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
 353        strbuf_release(&io.input);
 354        if (io.io.output)
 355                fclose(io.io.output);
 356        return hunk_no;
 357}
 358
 359static int check_one_conflict(int i, int *type)
 360{
 361        const struct cache_entry *e = active_cache[i];
 362
 363        if (!ce_stage(e)) {
 364                *type = RESOLVED;
 365                return i + 1;
 366        }
 367
 368        *type = PUNTED;
 369        while (ce_stage(active_cache[i]) == 1)
 370                i++;
 371
 372        /* Only handle regular files with both stages #2 and #3 */
 373        if (i + 1 < active_nr) {
 374                const struct cache_entry *e2 = active_cache[i];
 375                const struct cache_entry *e3 = active_cache[i + 1];
 376                if (ce_stage(e2) == 2 &&
 377                    ce_stage(e3) == 3 &&
 378                    ce_same_name(e, e3) &&
 379                    S_ISREG(e2->ce_mode) &&
 380                    S_ISREG(e3->ce_mode))
 381                        *type = THREE_STAGED;
 382        }
 383
 384        /* Skip the entries with the same name */
 385        while (i < active_nr && ce_same_name(e, active_cache[i]))
 386                i++;
 387        return i;
 388}
 389
 390static int find_conflict(struct string_list *conflict)
 391{
 392        int i;
 393        if (read_cache() < 0)
 394                return error("Could not read index");
 395
 396        for (i = 0; i < active_nr;) {
 397                int conflict_type;
 398                const struct cache_entry *e = active_cache[i];
 399                i = check_one_conflict(i, &conflict_type);
 400                if (conflict_type == THREE_STAGED)
 401                        string_list_insert(conflict, (const char *)e->name);
 402        }
 403        return 0;
 404}
 405
 406int rerere_remaining(struct string_list *merge_rr)
 407{
 408        int i;
 409        if (read_cache() < 0)
 410                return error("Could not read index");
 411
 412        for (i = 0; i < active_nr;) {
 413                int conflict_type;
 414                const struct cache_entry *e = active_cache[i];
 415                i = check_one_conflict(i, &conflict_type);
 416                if (conflict_type == PUNTED)
 417                        string_list_insert(merge_rr, (const char *)e->name);
 418                else if (conflict_type == RESOLVED) {
 419                        struct string_list_item *it;
 420                        it = string_list_lookup(merge_rr, (const char *)e->name);
 421                        if (it != NULL) {
 422                                free(it->util);
 423                                it->util = RERERE_RESOLVED;
 424                        }
 425                }
 426        }
 427        return 0;
 428}
 429
 430static int merge(const char *name, const char *path)
 431{
 432        int ret;
 433        mmfile_t cur = {NULL, 0}, base = {NULL, 0}, other = {NULL, 0};
 434        mmbuffer_t result = {NULL, 0};
 435
 436        if (handle_file(path, NULL, rerere_path(name, "thisimage")) < 0)
 437                return 1;
 438
 439        if (read_mmfile(&cur, rerere_path(name, "thisimage")) ||
 440                        read_mmfile(&base, rerere_path(name, "preimage")) ||
 441                        read_mmfile(&other, rerere_path(name, "postimage"))) {
 442                ret = 1;
 443                goto out;
 444        }
 445        ret = ll_merge(&result, path, &base, NULL, &cur, "", &other, "", NULL);
 446        if (!ret) {
 447                FILE *f;
 448
 449                if (utime(rerere_path(name, "postimage"), NULL) < 0)
 450                        warning("failed utime() on %s: %s",
 451                                        rerere_path(name, "postimage"),
 452                                        strerror(errno));
 453                f = fopen(path, "w");
 454                if (!f)
 455                        return error("Could not open %s: %s", path,
 456                                     strerror(errno));
 457                if (fwrite(result.ptr, result.size, 1, f) != 1)
 458                        error("Could not write %s: %s", path, strerror(errno));
 459                if (fclose(f))
 460                        return error("Writing %s failed: %s", path,
 461                                     strerror(errno));
 462        }
 463
 464out:
 465        free(cur.ptr);
 466        free(base.ptr);
 467        free(other.ptr);
 468        free(result.ptr);
 469
 470        return ret;
 471}
 472
 473static struct lock_file index_lock;
 474
 475static void update_paths(struct string_list *update)
 476{
 477        int i;
 478
 479        hold_locked_index(&index_lock, 1);
 480
 481        for (i = 0; i < update->nr; i++) {
 482                struct string_list_item *item = &update->items[i];
 483                if (add_file_to_cache(item->string, 0))
 484                        exit(128);
 485                fprintf(stderr, "Staged '%s' using previous resolution.\n",
 486                        item->string);
 487        }
 488
 489        if (active_cache_changed) {
 490                if (write_locked_index(&the_index, &index_lock, COMMIT_LOCK))
 491                        die("Unable to write new index file");
 492        } else
 493                rollback_lock_file(&index_lock);
 494}
 495
 496static int do_plain_rerere(struct string_list *rr, int fd)
 497{
 498        struct string_list conflict = STRING_LIST_INIT_DUP;
 499        struct string_list update = STRING_LIST_INIT_DUP;
 500        int i;
 501
 502        find_conflict(&conflict);
 503
 504        /*
 505         * MERGE_RR records paths with conflicts immediately after merge
 506         * failed.  Some of the conflicted paths might have been hand resolved
 507         * in the working tree since then, but the initial run would catch all
 508         * and register their preimages.
 509         */
 510
 511        for (i = 0; i < conflict.nr; i++) {
 512                const char *path = conflict.items[i].string;
 513                if (!string_list_has_string(rr, path)) {
 514                        unsigned char sha1[20];
 515                        char *hex;
 516                        int ret;
 517                        ret = handle_file(path, sha1, NULL);
 518                        if (ret < 1)
 519                                continue;
 520                        hex = xstrdup(sha1_to_hex(sha1));
 521                        string_list_insert(rr, path)->util = hex;
 522                        if (mkdir_in_gitdir(git_path("rr-cache/%s", hex)))
 523                                continue;
 524                        handle_file(path, NULL, rerere_path(hex, "preimage"));
 525                        fprintf(stderr, "Recorded preimage for '%s'\n", path);
 526                }
 527        }
 528
 529        /*
 530         * Now some of the paths that had conflicts earlier might have been
 531         * hand resolved.  Others may be similar to a conflict already that
 532         * was resolved before.
 533         */
 534
 535        for (i = 0; i < rr->nr; i++) {
 536                int ret;
 537                const char *path = rr->items[i].string;
 538                const char *name = (const char *)rr->items[i].util;
 539
 540                if (has_rerere_resolution(name)) {
 541                        if (merge(name, path))
 542                                continue;
 543
 544                        if (rerere_autoupdate)
 545                                string_list_insert(&update, path);
 546                        else
 547                                fprintf(stderr,
 548                                        "Resolved '%s' using previous resolution.\n",
 549                                        path);
 550                        goto mark_resolved;
 551                }
 552
 553                /* Let's see if we have resolved it. */
 554                ret = handle_file(path, NULL, NULL);
 555                if (ret)
 556                        continue;
 557
 558                fprintf(stderr, "Recorded resolution for '%s'.\n", path);
 559                copy_file(rerere_path(name, "postimage"), path, 0666);
 560        mark_resolved:
 561                free(rr->items[i].util);
 562                rr->items[i].util = NULL;
 563        }
 564
 565        if (update.nr)
 566                update_paths(&update);
 567
 568        return write_rr(rr, fd);
 569}
 570
 571static void git_rerere_config(void)
 572{
 573        git_config_get_bool("rerere.enabled", &rerere_enabled);
 574        git_config_get_bool("rerere.autoupdate", &rerere_autoupdate);
 575        git_config(git_default_config, NULL);
 576}
 577
 578static int is_rerere_enabled(void)
 579{
 580        const char *rr_cache;
 581        int rr_cache_exists;
 582
 583        if (!rerere_enabled)
 584                return 0;
 585
 586        rr_cache = git_path("rr-cache");
 587        rr_cache_exists = is_directory(rr_cache);
 588        if (rerere_enabled < 0)
 589                return rr_cache_exists;
 590
 591        if (!rr_cache_exists && mkdir_in_gitdir(rr_cache))
 592                die("Could not create directory %s", rr_cache);
 593        return 1;
 594}
 595
 596int setup_rerere(struct string_list *merge_rr, int flags)
 597{
 598        int fd;
 599
 600        git_rerere_config();
 601        if (!is_rerere_enabled())
 602                return -1;
 603
 604        if (flags & (RERERE_AUTOUPDATE|RERERE_NOAUTOUPDATE))
 605                rerere_autoupdate = !!(flags & RERERE_AUTOUPDATE);
 606        merge_rr_path = git_pathdup("MERGE_RR");
 607        fd = hold_lock_file_for_update(&write_lock, merge_rr_path,
 608                                       LOCK_DIE_ON_ERROR);
 609        read_rr(merge_rr);
 610        return fd;
 611}
 612
 613int rerere(int flags)
 614{
 615        struct string_list merge_rr = STRING_LIST_INIT_DUP;
 616        int fd;
 617
 618        fd = setup_rerere(&merge_rr, flags);
 619        if (fd < 0)
 620                return 0;
 621        return do_plain_rerere(&merge_rr, fd);
 622}
 623
 624static int rerere_forget_one_path(const char *path, struct string_list *rr)
 625{
 626        const char *filename;
 627        char *hex;
 628        unsigned char sha1[20];
 629        int ret;
 630        struct string_list_item *item;
 631
 632        ret = handle_cache(path, sha1, NULL);
 633        if (ret < 1)
 634                return error("Could not parse conflict hunks in '%s'", path);
 635        hex = xstrdup(sha1_to_hex(sha1));
 636        filename = rerere_path(hex, "postimage");
 637        if (unlink(filename))
 638                return (errno == ENOENT
 639                        ? error("no remembered resolution for %s", path)
 640                        : error("cannot unlink %s: %s", filename, strerror(errno)));
 641
 642        handle_cache(path, sha1, rerere_path(hex, "preimage"));
 643        fprintf(stderr, "Updated preimage for '%s'\n", path);
 644
 645        item = string_list_insert(rr, path);
 646        free(item->util);
 647        item->util = hex;
 648        fprintf(stderr, "Forgot resolution for %s\n", path);
 649        return 0;
 650}
 651
 652int rerere_forget(struct pathspec *pathspec)
 653{
 654        int i, fd;
 655        struct string_list conflict = STRING_LIST_INIT_DUP;
 656        struct string_list merge_rr = STRING_LIST_INIT_DUP;
 657
 658        if (read_cache() < 0)
 659                return error("Could not read index");
 660
 661        fd = setup_rerere(&merge_rr, RERERE_NOAUTOUPDATE);
 662
 663        unmerge_cache(pathspec);
 664        find_conflict(&conflict);
 665        for (i = 0; i < conflict.nr; i++) {
 666                struct string_list_item *it = &conflict.items[i];
 667                if (!match_pathspec(pathspec, it->string,
 668                                    strlen(it->string), 0, NULL, 0))
 669                        continue;
 670                rerere_forget_one_path(it->string, &merge_rr);
 671        }
 672        return write_rr(&merge_rr, fd);
 673}
 674
 675static time_t rerere_created_at(const char *name)
 676{
 677        struct stat st;
 678        return stat(rerere_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
 679}
 680
 681static time_t rerere_last_used_at(const char *name)
 682{
 683        struct stat st;
 684        return stat(rerere_path(name, "postimage"), &st) ? (time_t) 0 : st.st_mtime;
 685}
 686
 687static void unlink_rr_item(const char *name)
 688{
 689        unlink(rerere_path(name, "thisimage"));
 690        unlink(rerere_path(name, "preimage"));
 691        unlink(rerere_path(name, "postimage"));
 692        rmdir(git_path("rr-cache/%s", name));
 693}
 694
 695void rerere_gc(struct string_list *rr)
 696{
 697        struct string_list to_remove = STRING_LIST_INIT_DUP;
 698        DIR *dir;
 699        struct dirent *e;
 700        int i, cutoff;
 701        time_t now = time(NULL), then;
 702        int cutoff_noresolve = 15;
 703        int cutoff_resolve = 60;
 704
 705        git_config_get_int("gc.rerereresolved", &cutoff_resolve);
 706        git_config_get_int("gc.rerereunresolved", &cutoff_noresolve);
 707        git_config(git_default_config, NULL);
 708        dir = opendir(git_path("rr-cache"));
 709        if (!dir)
 710                die_errno("unable to open rr-cache directory");
 711        while ((e = readdir(dir))) {
 712                if (is_dot_or_dotdot(e->d_name))
 713                        continue;
 714
 715                then = rerere_last_used_at(e->d_name);
 716                if (then) {
 717                        cutoff = cutoff_resolve;
 718                } else {
 719                        then = rerere_created_at(e->d_name);
 720                        if (!then)
 721                                continue;
 722                        cutoff = cutoff_noresolve;
 723                }
 724                if (then < now - cutoff * 86400)
 725                        string_list_append(&to_remove, e->d_name);
 726        }
 727        closedir(dir);
 728        for (i = 0; i < to_remove.nr; i++)
 729                unlink_rr_item(to_remove.items[i].string);
 730        string_list_clear(&to_remove, 0);
 731}
 732
 733void rerere_clear(struct string_list *merge_rr)
 734{
 735        int i;
 736
 737        for (i = 0; i < merge_rr->nr; i++) {
 738                const char *name = (const char *)merge_rr->items[i].util;
 739                if (!has_rerere_resolution(name))
 740                        unlink_rr_item(name);
 741        }
 742        unlink_or_warn(git_path("MERGE_RR"));
 743}