src/fileops.c

   1 /*
   2  * Copyright (C) the libgit2 contributors. All rights reserved.
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7 #include "common.h"
   8 #include "fileops.h"
   9 #include <ctype.h>
  10 #if GIT_WIN32
  11 #include "win32/findfile.h"
  12 #endif
  13
  14 int git_futils_mkpath2file(const char *file_path, const mode_t mode)
  15 {
  16         return git_futils_mkdir(
  17                 file_path, NULL, mode,
  18                 GIT_MKDIR_PATH | GIT_MKDIR_SKIP_LAST | GIT_MKDIR_VERIFY_DIR);
  19 }
  20
  21 int git_futils_mktmp(git_buf *path_out, const char *filename)
  22 {
  23         int fd;
  24
  25         git_buf_sets(path_out, filename);
  26         git_buf_puts(path_out, "_git2_XXXXXX");
  27
  28         if (git_buf_oom(path_out))
  29                 return -1;
  30
  31         if ((fd = p_mkstemp(path_out->ptr)) < 0) {
  32                 giterr_set(GITERR_OS,
  33                         "Failed to create temporary file '%s'", path_out->ptr);
  34                 return -1;
  35         }
  36
  37         return fd;
  38 }
  39
  40 int git_futils_creat_withpath(const char *path, const mode_t dirmode, const mode_t mode)
  41 {
  42         int fd;
  43
  44         if (git_futils_mkpath2file(path, dirmode) < 0)
  45                 return -1;
  46
  47         fd = p_creat(path, mode);
  48         if (fd < 0) {
  49                 giterr_set(GITERR_OS, "Failed to create file '%s'", path);
  50                 return -1;
  51         }
  52
  53         return fd;
  54 }
  55
  56 int git_futils_creat_locked(const char *path, const mode_t mode)
  57 {
  58         int fd;
  59
  60 #ifdef GIT_WIN32
  61         wchar_t buf[GIT_WIN_PATH];
  62
  63         git__utf8_to_16(buf, GIT_WIN_PATH, path);
  64         fd = _wopen(buf, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_EXCL, mode);
  65 #else
  66         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_EXCL, mode);
  67 #endif
  68
  69         if (fd < 0) {
  70                 giterr_set(GITERR_OS, "Failed to create locked file '%s'", path);
  71                 return -1;
  72         }
  73
  74         return fd;
  75 }
  76
  77 int git_futils_creat_locked_withpath(const char *path, const mode_t dirmode, const mode_t mode)
  78 {
  79         if (git_futils_mkpath2file(path, dirmode) < 0)
  80                 return -1;
  81
  82         return git_futils_creat_locked(path, mode);
  83 }
  84
  85 int git_futils_open_ro(const char *path)
  86 {
  87         int fd = p_open(path, O_RDONLY);
  88         if (fd < 0) {
  89                 if (errno == ENOENT || errno == ENOTDIR)
  90                         fd = GIT_ENOTFOUND;
  91                 giterr_set(GITERR_OS, "Failed to open '%s'", path);
  92         }
  93         return fd;
  94 }
  95
  96 git_off_t git_futils_filesize(git_file fd)
  97 {
  98         struct stat sb;
  99
 100         if (p_fstat(fd, &sb)) {
 101                 giterr_set(GITERR_OS, "Failed to stat file descriptor");
 102                 return -1;
 103         }
 104
 105         return sb.st_size;
 106 }
 107
 108 mode_t git_futils_canonical_mode(mode_t raw_mode)
 109 {
 110         if (S_ISREG(raw_mode))
 111                 return S_IFREG | GIT_CANONICAL_PERMS(raw_mode);
 112         else if (S_ISLNK(raw_mode))
 113                 return S_IFLNK;
 114         else if (S_ISGITLINK(raw_mode))
 115                 return S_IFGITLINK;
 116         else if (S_ISDIR(raw_mode))
 117                 return S_IFDIR;
 118         else
 119                 return 0;
 120 }
 121
 122 int git_futils_readbuffer_fd(git_buf *buf, git_file fd, size_t len)
 123 {
 124         ssize_t read_size = 0;
 125
 126         git_buf_clear(buf);
 127
 128         if (git_buf_grow(buf, len + 1) < 0)
 129                 return -1;
 130
 131         /* p_read loops internally to read len bytes */
 132         read_size = p_read(fd, buf->ptr, len);
 133
 134         if (read_size != (ssize_t)len) {
 135                 giterr_set(GITERR_OS, "Failed to read descriptor");
 136                 return -1;
 137         }
 138
 139         buf->ptr[read_size] = '\0';
 140         buf->size = read_size;
 141
 142         return 0;
 143 }
 144
 145 int git_futils_readbuffer_updated(
 146         git_buf *buf, const char *path, time_t *mtime, size_t *size, int *updated)
 147 {
 148         git_file fd;
 149         struct stat st;
 150         bool changed = false;
 151
 152         assert(buf && path && *path);
 153
 154         if (updated != NULL)
 155                 *updated = 0;
 156
 157         if ((fd = git_futils_open_ro(path)) < 0)
 158                 return fd;
 159
 160         if (p_fstat(fd, &st) < 0 || S_ISDIR(st.st_mode) || !git__is_sizet(st.st_size+1)) {
 161                 p_close(fd);
 162                 giterr_set(GITERR_OS, "Invalid regular file stat for '%s'", path);
 163                 return -1;
 164         }
 165
 166         /*
 167          * If we were given a time and/or a size, we only want to read the file
 168          * if it has been modified.
 169          */
 170         if (size && *size != (size_t)st.st_size)
 171                 changed = true;
 172         if (mtime && *mtime != st.st_mtime)
 173                 changed = true;
 174         if (!size && !mtime)
 175                 changed = true;
 176
 177         if (!changed) {
 178                 p_close(fd);
 179                 return 0;
 180         }
 181
 182         if (mtime != NULL)
 183                 *mtime = st.st_mtime;
 184         if (size != NULL)
 185                 *size = (size_t)st.st_size;
 186
 187         if (git_futils_readbuffer_fd(buf, fd, (size_t)st.st_size) < 0) {
 188                 p_close(fd);
 189                 return -1;
 190         }
 191
 192         p_close(fd);
 193
 194         if (updated != NULL)
 195                 *updated = 1;
 196
 197         return 0;
 198 }
 199
 200 int git_futils_readbuffer(git_buf *buf, const char *path)
 201 {
 202         return git_futils_readbuffer_updated(buf, path, NULL, NULL, NULL);
 203 }
 204
 205 int git_futils_mv_withpath(const char *from, const char *to, const mode_t dirmode)
 206 {
 207         if (git_futils_mkpath2file(to, dirmode) < 0)
 208                 return -1;
 209
 210         if (p_rename(from, to) < 0) {
 211                 giterr_set(GITERR_OS, "Failed to rename '%s' to '%s'", from, to);
 212                 return -1;
 213         }
 214
 215         return 0;
 216 }
 217
 218 int git_futils_mmap_ro(git_map *out, git_file fd, git_off_t begin, size_t len)
 219 {
 220         return p_mmap(out, len, GIT_PROT_READ, GIT_MAP_SHARED, fd, begin);
 221 }
 222
 223 int git_futils_mmap_ro_file(git_map *out, const char *path)
 224 {
 225         git_file fd = git_futils_open_ro(path);
 226         git_off_t len;
 227         int result;
 228
 229         if (fd < 0)
 230                 return fd;
 231
 232         len = git_futils_filesize(fd);
 233         if (!git__is_sizet(len)) {
 234                 giterr_set(GITERR_OS, "File `%s` too large to mmap", path);
 235                 return -1;
 236         }
 237
 238         result = git_futils_mmap_ro(out, fd, 0, (size_t)len);
 239         p_close(fd);
 240         return result;
 241 }
 242
 243 void git_futils_mmap_free(git_map *out)
 244 {
 245         p_munmap(out);
 246 }
 247
 248 int git_futils_mkdir(
 249         const char *path,
 250         const char *base,
 251         mode_t mode,
 252         uint32_t flags)
 253 {
 254         int error = -1;
 255         git_buf make_path = GIT_BUF_INIT;
 256         ssize_t root = 0;
 257         char lastch, *tail;
 258
 259         /* build path and find "root" where we should start calling mkdir */
 260         if (git_path_join_unrooted(&make_path, path, base, &root) < 0)
 261                 return -1;
 262
 263         if (make_path.size == 0) {
 264                 giterr_set(GITERR_OS, "Attempt to create empty path");
 265                 goto fail;
 266         }
 267
 268         /* remove trailing slashes on path */
 269         while (make_path.ptr[make_path.size - 1] == '/') {
 270                 make_path.size--;
 271                 make_path.ptr[make_path.size] = '\0';
 272         }
 273
 274         /* if we are not supposed to made the last element, truncate it */
 275         if ((flags & GIT_MKDIR_SKIP_LAST) != 0)
 276                 git_buf_rtruncate_at_char(&make_path, '/');
 277
 278         /* if we are not supposed to make the whole path, reset root */
 279         if ((flags & GIT_MKDIR_PATH) == 0)
 280                 root = git_buf_rfind(&make_path, '/');
 281
 282         /* clip root to make_path length */
 283         if (root >= (ssize_t)make_path.size)
 284                 root = (ssize_t)make_path.size - 1;
 285         if (root < 0)
 286                 root = 0;
 287
 288         tail = & make_path.ptr[root];
 289
 290         while (*tail) {
 291                 /* advance tail to include next path component */
 292                 while (*tail == '/')
 293                         tail++;
 294                 while (*tail && *tail != '/')
 295                         tail++;
 296
 297                 /* truncate path at next component */
 298                 lastch = *tail;
 299                 *tail = '\0';
 300
 301                 /* make directory */
 302                 if (p_mkdir(make_path.ptr, mode) < 0) {
 303                         int already_exists = 0;
 304
 305                         switch (errno) {
 306                                 case EEXIST:
 307                                         if (!lastch && (flags & GIT_MKDIR_VERIFY_DIR) != 0 &&
 308                                                 !git_path_isdir(make_path.ptr)) {
 309                                                 giterr_set(
 310                                                         GITERR_OS, "Existing path is not a directory '%s'",
 311                                                         make_path.ptr);
 312                                                 error = GIT_ENOTFOUND;
 313                                                 goto fail;
 314                                         }
 315
 316                                         already_exists = 1;
 317                                         break;
 318                                 case ENOSYS:
 319                                         /* Solaris can generate this error if you try to mkdir
 320                                          * a path which is already a mount point. In that case,
 321                                          * the path does already exist; but it's not implied by
 322                                          * the definition of the error, so let's recheck */
 323                                         if (git_path_isdir(make_path.ptr)) {
 324                                                 already_exists = 1;
 325                                                 break;
 326                                         }
 327
 328                                         /* Fall through */
 329                                         errno = ENOSYS;
 330                                 default:
 331                                         giterr_set(GITERR_OS, "Failed to make directory '%s'",
 332                                                 make_path.ptr);
 333                                         goto fail;
 334                         }
 335
 336                         if (already_exists && (flags & GIT_MKDIR_EXCL) != 0) {
 337                                 giterr_set(GITERR_OS, "Directory already exists '%s'",
 338                                         make_path.ptr);
 339                                 error = GIT_EEXISTS;
 340                                 goto fail;
 341                         }
 342                 }
 343
 344                 /* chmod if requested */
 345                 if ((flags & GIT_MKDIR_CHMOD_PATH) != 0 ||
 346                         ((flags & GIT_MKDIR_CHMOD) != 0 && lastch == '\0'))
 347                 {
 348                         if (p_chmod(make_path.ptr, mode) < 0) {
 349                                 giterr_set(GITERR_OS, "Failed to set permissions on '%s'",
 350                                         make_path.ptr);
 351                                 goto fail;
 352                         }
 353                 }
 354
 355                 *tail = lastch;
 356         }
 357
 358         git_buf_free(&make_path);
 359         return 0;
 360
 361 fail:
 362         git_buf_free(&make_path);
 363         return error;
 364 }
 365
 366 int git_futils_mkdir_r(const char *path, const char *base, const mode_t mode)
 367 {
 368         return git_futils_mkdir(path, base, mode, GIT_MKDIR_PATH);
 369 }
 370
 371 typedef struct {
 372         const char *base;
 373         size_t baselen;
 374         uint32_t flags;
 375         int error;
 376 } futils__rmdir_data;
 377
 378 static int futils__error_cannot_rmdir(const char *path, const char *filemsg)
 379 {
 380         if (filemsg)
 381                 giterr_set(GITERR_OS, "Could not remove directory. File '%s' %s",
 382                                    path, filemsg);
 383         else
 384                 giterr_set(GITERR_OS, "Could not remove directory '%s'", path);
 385
 386         return -1;
 387 }
 388
 389 static int futils__rm_first_parent(git_buf *path, const char *ceiling)
 390 {
 391         int error = GIT_ENOTFOUND;
 392         struct stat st;
 393
 394         while (error == GIT_ENOTFOUND) {
 395                 git_buf_rtruncate_at_char(path, '/');
 396
 397                 if (!path->size || git__prefixcmp(path->ptr, ceiling) != 0)
 398                         error = 0;
 399                 else if (p_lstat_posixly(path->ptr, &st) == 0) {
 400                         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 401                                 error = p_unlink(path->ptr);
 402                         else if (!S_ISDIR(st.st_mode))
 403                                 error = -1; /* fail to remove non-regular file */
 404                 } else if (errno != ENOTDIR)
 405                         error = -1;
 406         }
 407
 408         if (error)
 409                 futils__error_cannot_rmdir(path->ptr, "cannot remove parent");
 410
 411         return error;
 412 }
 413
 414 static int futils__rmdir_recurs_foreach(void *opaque, git_buf *path)
 415 {
 416         struct stat st;
 417         futils__rmdir_data *data = opaque;
 418
 419         if ((data->error = p_lstat_posixly(path->ptr, &st)) < 0) {
 420                 if (errno == ENOENT)
 421                         data->error = 0;
 422                 else if (errno == ENOTDIR) {
 423                         /* asked to remove a/b/c/d/e and a/b is a normal file */
 424                         if ((data->flags & GIT_RMDIR_REMOVE_BLOCKERS) != 0)
 425                                 data->error = futils__rm_first_parent(path, data->base);
 426                         else
 427                                 futils__error_cannot_rmdir(
 428                                         path->ptr, "parent is not directory");
 429                 }
 430                 else
 431                         futils__error_cannot_rmdir(path->ptr, "cannot access");
 432         }
 433
 434         else if (S_ISDIR(st.st_mode)) {
 435                 int error = git_path_direach(path, futils__rmdir_recurs_foreach, data);
 436                 if (error < 0)
 437                         return (error == GIT_EUSER) ? data->error : error;
 438
 439                 data->error = p_rmdir(path->ptr);
 440
 441                 if (data->error < 0) {
 442                         if ((data->flags & GIT_RMDIR_SKIP_NONEMPTY) != 0 &&
 443                                 (errno == ENOTEMPTY || errno == EEXIST))
 444                                 data->error = 0;
 445                         else
 446                                 futils__error_cannot_rmdir(path->ptr, NULL);
 447                 }
 448         }
 449
 450         else if ((data->flags & GIT_RMDIR_REMOVE_FILES) != 0) {
 451                 data->error = p_unlink(path->ptr);
 452
 453                 if (data->error < 0)
 454                         futils__error_cannot_rmdir(path->ptr, "cannot be removed");
 455         }
 456
 457         else if ((data->flags & GIT_RMDIR_SKIP_NONEMPTY) == 0)
 458                 data->error = futils__error_cannot_rmdir(path->ptr, "still present");
 459
 460         return data->error;
 461 }
 462
 463 static int futils__rmdir_empty_parent(void *opaque, git_buf *path)
 464 {
 465         futils__rmdir_data *data = opaque;
 466         int error;
 467
 468         if (git_buf_len(path) <= data->baselen)
 469                 return GIT_ITEROVER;
 470
 471         error = p_rmdir(git_buf_cstr(path));
 472
 473         if (error) {
 474                 int en = errno;
 475
 476                 if (en == ENOENT || en == ENOTDIR) {
 477                         giterr_clear();
 478                         error = 0;
 479                 } else if (en == ENOTEMPTY || en == EEXIST) {
 480                         giterr_clear();
 481                         error = GIT_ITEROVER;
 482                 } else {
 483                         futils__error_cannot_rmdir(git_buf_cstr(path), NULL);
 484                 }
 485         }
 486
 487         return error;
 488 }
 489
 490 int git_futils_rmdir_r(
 491         const char *path, const char *base, uint32_t flags)
 492 {
 493         int error;
 494         git_buf fullpath = GIT_BUF_INIT;
 495         futils__rmdir_data data;
 496
 497         /* build path and find "root" where we should start calling mkdir */
 498         if (git_path_join_unrooted(&fullpath, path, base, NULL) < 0)
 499                 return -1;
 500
 501         data.base    = base ? base : "";
 502         data.baselen = base ? strlen(base) : 0;
 503         data.flags   = flags;
 504         data.error   = 0;
 505
 506         error = futils__rmdir_recurs_foreach(&data, &fullpath);
 507
 508         /* remove now-empty parents if requested */
 509         if (!error && (flags & GIT_RMDIR_EMPTY_PARENTS) != 0) {
 510                 error = git_path_walk_up(
 511                         &fullpath, base, futils__rmdir_empty_parent, &data);
 512
 513                 if (error == GIT_ITEROVER)
 514                         error = 0;
 515         }
 516
 517         git_buf_free(&fullpath);
 518
 519         return error;
 520 }
 521
 522 int git_futils_find_system_file(git_buf *path, const char *filename)
 523 {
 524 #ifdef GIT_WIN32
 525         // try to find git.exe/git.cmd on path
 526         if (!win32_find_system_file_using_path(path, filename))
 527                 return 0;
 528
 529         // try to find msysgit installation path using registry
 530         if (!win32_find_system_file_using_registry(path, filename))
 531                 return 0;
 532 #else
 533         if (git_buf_joinpath(path, "/etc", filename) < 0)
 534                 return -1;
 535
 536         if (git_path_exists(path->ptr) == true)
 537                 return 0;
 538 #endif
 539
 540         git_buf_clear(path);
 541         giterr_set(GITERR_OS, "The system file '%s' doesn't exist", filename);
 542         return GIT_ENOTFOUND;
 543 }
 544
 545 int git_futils_find_global_file(git_buf *path, const char *filename)
 546 {
 547 #ifdef GIT_WIN32
 548         struct win32_path root;
 549         static const wchar_t *tmpls[4] = {
 550                 L"%HOME%\\",
 551                 L"%HOMEDRIVE%%HOMEPATH%\\",
 552                 L"%USERPROFILE%\\",
 553                 NULL,
 554         };
 555         const wchar_t **tmpl;
 556
 557         for (tmpl = tmpls; *tmpl != NULL; tmpl++) {
 558                 /* try to expand environment variable, skipping if not set */
 559                 if (win32_expand_path(&root, *tmpl) != 0 || root.path[0] == L'%')
 560                         continue;
 561
 562                 /* try to look up file under path */
 563                 if (!win32_find_file(path, &root, filename))
 564                         return 0;
 565         }
 566
 567         giterr_set(GITERR_OS, "The global file '%s' doesn't exist", filename);
 568         git_buf_clear(path);
 569
 570         return GIT_ENOTFOUND;
 571 #else
 572         const char *home = getenv("HOME");
 573
 574         if (home == NULL) {
 575                 giterr_set(GITERR_OS, "Global file lookup failed. "
 576                         "Cannot locate the user's home directory");
 577                 return GIT_ENOTFOUND;
 578         }
 579
 580         if (git_buf_joinpath(path, home, filename) < 0)
 581                 return -1;
 582
 583         if (git_path_exists(path->ptr) == false) {
 584                 giterr_set(GITERR_OS, "The global file '%s' doesn't exist", filename);
 585                 git_buf_clear(path);
 586                 return GIT_ENOTFOUND;
 587         }
 588
 589         return 0;
 590 #endif
 591 }
 592
 593 int git_futils_fake_symlink(const char *old, const char *new)
 594 {
 595         int retcode = GIT_ERROR;
 596         int fd = git_futils_creat_withpath(new, 0755, 0644);
 597         if (fd >= 0) {
 598                 retcode = p_write(fd, old, strlen(old));
 599                 p_close(fd);
 600         }
 601         return retcode;
 602 }
 603
 604 static int cp_by_fd(int ifd, int ofd, bool close_fd_when_done)
 605 {
 606         int error = 0;
 607         char buffer[4096];
 608         ssize_t len = 0;
 609
 610         while (!error && (len = p_read(ifd, buffer, sizeof(buffer))) > 0)
 611                 /* p_write() does not have the same semantics as write().  It loops
 612                  * internally and will return 0 when it has completed writing.
 613                  */
 614                 error = p_write(ofd, buffer, len);
 615
 616         if (len < 0) {
 617                 giterr_set(GITERR_OS, "Read error while copying file");
 618                 error = (int)len;
 619         }
 620
 621         if (close_fd_when_done) {
 622                 p_close(ifd);
 623                 p_close(ofd);
 624         }
 625
 626         return error;
 627 }
 628
 629 int git_futils_cp(const char *from, const char *to, mode_t filemode)
 630 {
 631         int ifd, ofd;
 632
 633         if ((ifd = git_futils_open_ro(from)) < 0)
 634                 return ifd;
 635
 636         if ((ofd = p_open(to, O_WRONLY | O_CREAT | O_EXCL, filemode)) < 0) {
 637                 if (errno == ENOENT || errno == ENOTDIR)
 638                         ofd = GIT_ENOTFOUND;
 639                 giterr_set(GITERR_OS, "Failed to open '%s' for writing", to);
 640                 p_close(ifd);
 641                 return ofd;
 642         }
 643
 644         return cp_by_fd(ifd, ofd, true);
 645 }
 646
 647 static int cp_link(const char *from, const char *to, size_t link_size)
 648 {
 649         int error = 0;
 650         ssize_t read_len;
 651         char *link_data = git__malloc(link_size + 1);
 652         GITERR_CHECK_ALLOC(link_data);
 653
 654         read_len = p_readlink(from, link_data, link_size);
 655         if (read_len != (ssize_t)link_size) {
 656                 giterr_set(GITERR_OS, "Failed to read symlink data for '%s'", from);
 657                 error = -1;
 658         }
 659         else {
 660                 link_data[read_len] = '\0';
 661
 662                 if (p_symlink(link_data, to) < 0) {
 663                         giterr_set(GITERR_OS, "Could not symlink '%s' as '%s'",
 664                                 link_data, to);
 665                         error = -1;
 666                 }
 667         }
 668
 669         git__free(link_data);
 670         return error;
 671 }
 672
 673 typedef struct {
 674         const char *to_root;
 675         git_buf to;
 676         ssize_t from_prefix;
 677         uint32_t flags;
 678         uint32_t mkdir_flags;
 679         mode_t dirmode;
 680 } cp_r_info;
 681
 682 static int _cp_r_callback(void *ref, git_buf *from)
 683 {
 684         cp_r_info *info = ref;
 685         struct stat from_st, to_st;
 686         bool exists = false;
 687
 688         if ((info->flags & GIT_CPDIR_COPY_DOTFILES) == 0 &&
 689                 from->ptr[git_path_basename_offset(from)] == '.')
 690                 return 0;
 691
 692         if (git_buf_joinpath(
 693                         &info->to, info->to_root, from->ptr + info->from_prefix) < 0)
 694                 return -1;
 695
 696         if (p_lstat(info->to.ptr, &to_st) < 0) {
 697                 if (errno != ENOENT && errno != ENOTDIR) {
 698                         giterr_set(GITERR_OS,
 699                                 "Could not access %s while copying files", info->to.ptr);
 700                         return -1;
 701                 }
 702         } else
 703                 exists = true;
 704
 705         if (git_path_lstat(from->ptr, &from_st) < 0)
 706                 return -1;
 707
 708         if (S_ISDIR(from_st.st_mode)) {
 709                 int error = 0;
 710                 mode_t oldmode = info->dirmode;
 711
 712                 /* if we are not chmod'ing, then overwrite dirmode */
 713                 if ((info->flags & GIT_CPDIR_CHMOD) == 0)
 714                         info->dirmode = from_st.st_mode;
 715
 716                 /* make directory now if CREATE_EMPTY_DIRS is requested and needed */
 717                 if (!exists && (info->flags & GIT_CPDIR_CREATE_EMPTY_DIRS) != 0)
 718                         error = git_futils_mkdir(
 719                                 info->to.ptr, NULL, info->dirmode, info->mkdir_flags);
 720
 721                 /* recurse onto target directory */
 722                 if (!exists || S_ISDIR(to_st.st_mode))
 723                         error = git_path_direach(from, _cp_r_callback, info);
 724
 725                 if (oldmode != 0)
 726                         info->dirmode = oldmode;
 727
 728                 return error;
 729         }
 730
 731         if (exists) {
 732                 if ((info->flags & GIT_CPDIR_OVERWRITE) == 0)
 733                         return 0;
 734
 735                 if (p_unlink(info->to.ptr) < 0) {
 736                         giterr_set(GITERR_OS, "Cannot overwrite existing file '%s'",
 737                                 info->to.ptr);
 738                         return -1;
 739                 }
 740         }
 741
 742         /* Done if this isn't a regular file or a symlink */
 743         if (!S_ISREG(from_st.st_mode) &&
 744                 (!S_ISLNK(from_st.st_mode) ||
 745                  (info->flags & GIT_CPDIR_COPY_SYMLINKS) == 0))
 746                 return 0;
 747
 748         /* Make container directory on demand if needed */
 749         if ((info->flags & GIT_CPDIR_CREATE_EMPTY_DIRS) == 0 &&
 750                 git_futils_mkdir(
 751                         info->to.ptr, NULL, info->dirmode, info->mkdir_flags) < 0)
 752                 return -1;
 753
 754         /* make symlink or regular file */
 755         if (S_ISLNK(from_st.st_mode))
 756                 return cp_link(from->ptr, info->to.ptr, (size_t)from_st.st_size);
 757         else
 758                 return git_futils_cp(from->ptr, info->to.ptr, from_st.st_mode);
 759 }
 760
 761 int git_futils_cp_r(
 762         const char *from,
 763         const char *to,
 764         uint32_t flags,
 765         mode_t dirmode)
 766 {
 767         int error;
 768         git_buf path = GIT_BUF_INIT;
 769         cp_r_info info;
 770
 771         if (git_buf_sets(&path, from) < 0)
 772                 return -1;
 773
 774         info.to_root = to;
 775         info.flags   = flags;
 776         info.dirmode = dirmode;
 777         info.from_prefix = path.size;
 778         git_buf_init(&info.to, 0);
 779
 780         /* precalculate mkdir flags */
 781         if ((flags & GIT_CPDIR_CREATE_EMPTY_DIRS) == 0) {
 782                 info.mkdir_flags = GIT_MKDIR_PATH | GIT_MKDIR_SKIP_LAST;
 783                 if ((flags & GIT_CPDIR_CHMOD) != 0)
 784                         info.mkdir_flags |= GIT_MKDIR_CHMOD_PATH;
 785         } else {
 786                 info.mkdir_flags =
 787                         ((flags & GIT_CPDIR_CHMOD) != 0) ? GIT_MKDIR_CHMOD : 0;
 788         }
 789
 790         error = _cp_r_callback(&info, &path);
 791
 792         git_buf_free(&path);
 793         git_buf_free(&info.to);
 794
 795         return error;
 796 }
 797
 798 int git_futils_filestamp_check(
 799         git_futils_filestamp *stamp, const char *path)
 800 {
 801         struct stat st;
 802
 803         /* if the stamp is NULL, then always reload */
 804         if (stamp == NULL)
 805                 return 1;
 806
 807         if (p_stat(path, &st) < 0)
 808                 return GIT_ENOTFOUND;
 809
 810         if (stamp->mtime == (git_time_t)st.st_mtime &&
 811                 stamp->size  == (git_off_t)st.st_size   &&
 812                 stamp->ino   == (unsigned int)st.st_ino)
 813                 return 0;
 814
 815         stamp->mtime = (git_time_t)st.st_mtime;
 816         stamp->size  = (git_off_t)st.st_size;
 817         stamp->ino   = (unsigned int)st.st_ino;
 818
 819         return 1;
 820 }
 821
 822 void git_futils_filestamp_set(
 823         git_futils_filestamp *target, const git_futils_filestamp *source)
 824 {
 825         assert(target);
 826
 827         if (source)
 828                 memcpy(target, source, sizeof(*target));
 829         else
 830                 memset(target, 0, sizeof(*target));
 831 }