src/fileops.c

   1 /*
   2  * Copyright (C) 2009-2012 the libgit2 contributors
   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;
 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                         if (errno == EEXIST) {
 304                                 if (!lastch && (flags & GIT_MKDIR_VERIFY_DIR) != 0) {
 305                                         if (!git_path_isdir(make_path.ptr)) {
 306                                                 giterr_set(
 307                                                         GITERR_OS, "Existing path is not a directory '%s'",
 308                                                         make_path.ptr);
 309                                                 error = GIT_ENOTFOUND;
 310                                                 goto fail;
 311                                         }
 312                                 }
 313                                 if ((flags & GIT_MKDIR_EXCL) != 0) {
 314                                         giterr_set(GITERR_OS, "Directory already exists '%s'",
 315                                                 make_path.ptr);
 316                                         error = GIT_EEXISTS;
 317                                         goto fail;
 318                                 }
 319                         } else {
 320                                 giterr_set(GITERR_OS, "Failed to make directory '%s'",
 321                                         make_path.ptr);
 322                                 goto fail;
 323                         }
 324                 }
 325
 326                 /* chmod if requested */
 327                 if ((flags & GIT_MKDIR_CHMOD_PATH) != 0 ||
 328                         ((flags & GIT_MKDIR_CHMOD) != 0 && lastch == '\0'))
 329                 {
 330                         if (p_chmod(make_path.ptr, mode) < 0) {
 331                                 giterr_set(GITERR_OS, "Failed to set permissions on '%s'",
 332                                         make_path.ptr);
 333                                 goto fail;
 334                         }
 335                 }
 336
 337                 *tail = lastch;
 338         }
 339
 340         git_buf_free(&make_path);
 341         return 0;
 342
 343 fail:
 344         git_buf_free(&make_path);
 345         return error;
 346 }
 347
 348 int git_futils_mkdir_r(const char *path, const char *base, const mode_t mode)
 349 {
 350         return git_futils_mkdir(path, base, mode, GIT_MKDIR_PATH);
 351 }
 352
 353 typedef struct {
 354         const char *base;
 355         size_t baselen;
 356         uint32_t flags;
 357         int error;
 358 } futils__rmdir_data;
 359
 360 static int futils__error_cannot_rmdir(const char *path, const char *filemsg)
 361 {
 362         if (filemsg)
 363                 giterr_set(GITERR_OS, "Could not remove directory. File '%s' %s",
 364                                    path, filemsg);
 365         else
 366                 giterr_set(GITERR_OS, "Could not remove directory '%s'", path);
 367
 368         return -1;
 369 }
 370
 371 static int futils__rm_first_parent(git_buf *path, const char *ceiling)
 372 {
 373         int error = GIT_ENOTFOUND;
 374         struct stat st;
 375
 376         while (error == GIT_ENOTFOUND) {
 377                 git_buf_rtruncate_at_char(path, '/');
 378
 379                 if (!path->size || git__prefixcmp(path->ptr, ceiling) != 0)
 380                         error = 0;
 381                 else if (p_lstat_posixly(path->ptr, &st) == 0) {
 382                         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 383                                 error = p_unlink(path->ptr);
 384                         else if (!S_ISDIR(st.st_mode))
 385                                 error = -1; /* fail to remove non-regular file */
 386                 } else if (errno != ENOTDIR)
 387                         error = -1;
 388         }
 389
 390         if (error)
 391                 futils__error_cannot_rmdir(path->ptr, "cannot remove parent");
 392
 393         return error;
 394 }
 395
 396 static int futils__rmdir_recurs_foreach(void *opaque, git_buf *path)
 397 {
 398         struct stat st;
 399         futils__rmdir_data *data = opaque;
 400
 401         if ((data->error = p_lstat_posixly(path->ptr, &st)) < 0) {
 402                 if (errno == ENOENT)
 403                         data->error = 0;
 404                 else if (errno == ENOTDIR) {
 405                         /* asked to remove a/b/c/d/e and a/b is a normal file */
 406                         if ((data->flags & GIT_RMDIR_REMOVE_BLOCKERS) != 0)
 407                                 data->error = futils__rm_first_parent(path, data->base);
 408                         else
 409                                 futils__error_cannot_rmdir(
 410                                         path->ptr, "parent is not directory");
 411                 }
 412                 else
 413                         futils__error_cannot_rmdir(path->ptr, "cannot access");
 414         }
 415
 416         else if (S_ISDIR(st.st_mode)) {
 417                 int error = git_path_direach(path, futils__rmdir_recurs_foreach, data);
 418                 if (error < 0)
 419                         return (error == GIT_EUSER) ? data->error : error;
 420
 421                 data->error = p_rmdir(path->ptr);
 422
 423                 if (data->error < 0) {
 424                         if ((data->flags & GIT_RMDIR_SKIP_NONEMPTY) != 0 &&
 425                                 (errno == ENOTEMPTY || errno == EEXIST))
 426                                 data->error = 0;
 427                         else
 428                                 futils__error_cannot_rmdir(path->ptr, NULL);
 429                 }
 430         }
 431
 432         else if ((data->flags & GIT_RMDIR_REMOVE_FILES) != 0) {
 433                 data->error = p_unlink(path->ptr);
 434
 435                 if (data->error < 0)
 436                         futils__error_cannot_rmdir(path->ptr, "cannot be removed");
 437         }
 438
 439         else if ((data->flags & GIT_RMDIR_SKIP_NONEMPTY) == 0)
 440                 data->error = futils__error_cannot_rmdir(path->ptr, "still present");
 441
 442         return data->error;
 443 }
 444
 445 static int futils__rmdir_empty_parent(void *opaque, git_buf *path)
 446 {
 447         futils__rmdir_data *data = opaque;
 448         int error;
 449
 450         if (git_buf_len(path) <= data->baselen)
 451                 return GIT_ITEROVER;
 452
 453         error = p_rmdir(git_buf_cstr(path));
 454
 455         if (error) {
 456                 int en = errno;
 457
 458                 if (en == ENOENT || en == ENOTDIR) {
 459                         giterr_clear();
 460                         error = 0;
 461                 } else if (en == ENOTEMPTY || en == EEXIST) {
 462                         giterr_clear();
 463                         error = GIT_ITEROVER;
 464                 } else {
 465                         futils__error_cannot_rmdir(git_buf_cstr(path), NULL);
 466                 }
 467         }
 468
 469         return error;
 470 }
 471
 472 int git_futils_rmdir_r(
 473         const char *path, const char *base, uint32_t flags)
 474 {
 475         int error;
 476         git_buf fullpath = GIT_BUF_INIT;
 477         futils__rmdir_data data;
 478
 479         /* build path and find "root" where we should start calling mkdir */
 480         if (git_path_join_unrooted(&fullpath, path, base, NULL) < 0)
 481                 return -1;
 482
 483         data.base    = base ? base : "";
 484         data.baselen = base ? strlen(base) : 0;
 485         data.flags   = flags;
 486         data.error   = 0;
 487
 488         error = futils__rmdir_recurs_foreach(&data, &fullpath);
 489
 490         /* remove now-empty parents if requested */
 491         if (!error && (flags & GIT_RMDIR_EMPTY_PARENTS) != 0) {
 492                 error = git_path_walk_up(
 493                         &fullpath, base, futils__rmdir_empty_parent, &data);
 494
 495                 if (error == GIT_ITEROVER)
 496                         error = 0;
 497         }
 498
 499         git_buf_free(&fullpath);
 500
 501         return error;
 502 }
 503
 504 int git_futils_find_system_file(git_buf *path, const char *filename)
 505 {
 506 #ifdef GIT_WIN32
 507         // try to find git.exe/git.cmd on path
 508         if (!win32_find_system_file_using_path(path, filename))
 509                 return 0;
 510
 511         // try to find msysgit installation path using registry
 512         if (!win32_find_system_file_using_registry(path, filename))
 513                 return 0;
 514 #else
 515         if (git_buf_joinpath(path, "/etc", filename) < 0)
 516                 return -1;
 517
 518         if (git_path_exists(path->ptr) == true)
 519                 return 0;
 520 #endif
 521
 522         git_buf_clear(path);
 523         giterr_set(GITERR_OS, "The system file '%s' doesn't exist", filename);
 524         return GIT_ENOTFOUND;
 525 }
 526
 527 int git_futils_find_global_file(git_buf *path, const char *filename)
 528 {
 529 #ifdef GIT_WIN32
 530         struct win32_path root;
 531         static const wchar_t *tmpls[4] = {
 532                 L"%HOME%\\",
 533                 L"%HOMEDRIVE%%HOMEPATH%\\",
 534                 L"%USERPROFILE%\\",
 535                 NULL,
 536         };
 537         const wchar_t **tmpl;
 538
 539         for (tmpl = tmpls; *tmpl != NULL; tmpl++) {
 540                 /* try to expand environment variable, skipping if not set */
 541                 if (win32_expand_path(&root, *tmpl) != 0 || root.path[0] == L'%')
 542                         continue;
 543
 544                 /* try to look up file under path */
 545                 if (!win32_find_file(path, &root, filename))
 546                         return 0;
 547
 548                 /* No error if file not found under %HOME%, b/c we don't trust it,
 549                  * but do error if another var is set and yet file is not found.
 550                  */
 551                 if (tmpl != tmpls)
 552                         break;
 553         }
 554
 555         giterr_set(GITERR_OS, "The global file '%s' doesn't exist", filename);
 556         git_buf_clear(path);
 557
 558         return GIT_ENOTFOUND;
 559 #else
 560         const char *home = getenv("HOME");
 561
 562         if (home == NULL) {
 563                 giterr_set(GITERR_OS, "Global file lookup failed. "
 564                         "Cannot locate the user's home directory");
 565                 return GIT_ENOTFOUND;
 566         }
 567
 568         if (git_buf_joinpath(path, home, filename) < 0)
 569                 return -1;
 570
 571         if (git_path_exists(path->ptr) == false) {
 572                 giterr_set(GITERR_OS, "The global file '%s' doesn't exist", filename);
 573                 git_buf_clear(path);
 574                 return GIT_ENOTFOUND;
 575         }
 576
 577         return 0;
 578 #endif
 579 }
 580
 581 int git_futils_fake_symlink(const char *old, const char *new)
 582 {
 583         int retcode = GIT_ERROR;
 584         int fd = git_futils_creat_withpath(new, 0755, 0644);
 585         if (fd >= 0) {
 586                 retcode = p_write(fd, old, strlen(old));
 587                 p_close(fd);
 588         }
 589         return retcode;
 590 }
 591
 592 static int cp_by_fd(int ifd, int ofd, bool close_fd_when_done)
 593 {
 594         int error = 0;
 595         char buffer[4096];
 596         ssize_t len = 0;
 597
 598         while (!error && (len = p_read(ifd, buffer, sizeof(buffer))) > 0)
 599                 /* p_write() does not have the same semantics as write().  It loops
 600                  * internally and will return 0 when it has completed writing.
 601                  */
 602                 error = p_write(ofd, buffer, len);
 603
 604         if (len < 0) {
 605                 giterr_set(GITERR_OS, "Read error while copying file");
 606                 error = (int)len;
 607         }
 608
 609         if (close_fd_when_done) {
 610                 p_close(ifd);
 611                 p_close(ofd);
 612         }
 613
 614         return error;
 615 }
 616
 617 int git_futils_cp(const char *from, const char *to, mode_t filemode)
 618 {
 619         int ifd, ofd;
 620
 621         if ((ifd = git_futils_open_ro(from)) < 0)
 622                 return ifd;
 623
 624         if ((ofd = p_open(to, O_WRONLY | O_CREAT | O_EXCL, filemode)) < 0) {
 625                 if (errno == ENOENT || errno == ENOTDIR)
 626                         ofd = GIT_ENOTFOUND;
 627                 giterr_set(GITERR_OS, "Failed to open '%s' for writing", to);
 628                 p_close(ifd);
 629                 return ofd;
 630         }
 631
 632         return cp_by_fd(ifd, ofd, true);
 633 }
 634
 635 static int cp_link(const char *from, const char *to, size_t link_size)
 636 {
 637         int error = 0;
 638         ssize_t read_len;
 639         char *link_data = git__malloc(link_size + 1);
 640         GITERR_CHECK_ALLOC(link_data);
 641
 642         read_len = p_readlink(from, link_data, link_size);
 643         if (read_len != (ssize_t)link_size) {
 644                 giterr_set(GITERR_OS, "Failed to read symlink data for '%s'", from);
 645                 error = -1;
 646         }
 647         else {
 648                 link_data[read_len] = '\0';
 649
 650                 if (p_symlink(link_data, to) < 0) {
 651                         giterr_set(GITERR_OS, "Could not symlink '%s' as '%s'",
 652                                 link_data, to);
 653                         error = -1;
 654                 }
 655         }
 656
 657         git__free(link_data);
 658         return error;
 659 }
 660
 661 typedef struct {
 662         const char *to_root;
 663         git_buf to;
 664         ssize_t from_prefix;
 665         uint32_t flags;
 666         uint32_t mkdir_flags;
 667         mode_t dirmode;
 668 } cp_r_info;
 669
 670 static int _cp_r_callback(void *ref, git_buf *from)
 671 {
 672         cp_r_info *info = ref;
 673         struct stat from_st, to_st;
 674         bool exists = false;
 675
 676         if ((info->flags & GIT_CPDIR_COPY_DOTFILES) == 0 &&
 677                 from->ptr[git_path_basename_offset(from)] == '.')
 678                 return 0;
 679
 680         if (git_buf_joinpath(
 681                         &info->to, info->to_root, from->ptr + info->from_prefix) < 0)
 682                 return -1;
 683
 684         if (p_lstat(info->to.ptr, &to_st) < 0) {
 685                 if (errno != ENOENT && errno != ENOTDIR) {
 686                         giterr_set(GITERR_OS,
 687                                 "Could not access %s while copying files", info->to.ptr);
 688                         return -1;
 689                 }
 690         } else
 691                 exists = true;
 692
 693         if (git_path_lstat(from->ptr, &from_st) < 0)
 694                 return -1;
 695
 696         if (S_ISDIR(from_st.st_mode)) {
 697                 int error = 0;
 698                 mode_t oldmode = info->dirmode;
 699
 700                 /* if we are not chmod'ing, then overwrite dirmode */
 701                 if ((info->flags & GIT_CPDIR_CHMOD) == 0)
 702                         info->dirmode = from_st.st_mode;
 703
 704                 /* make directory now if CREATE_EMPTY_DIRS is requested and needed */
 705                 if (!exists && (info->flags & GIT_CPDIR_CREATE_EMPTY_DIRS) != 0)
 706                         error = git_futils_mkdir(
 707                                 info->to.ptr, NULL, info->dirmode, info->mkdir_flags);
 708
 709                 /* recurse onto target directory */
 710                 if (!exists || S_ISDIR(to_st.st_mode))
 711                         error = git_path_direach(from, _cp_r_callback, info);
 712
 713                 if (oldmode != 0)
 714                         info->dirmode = oldmode;
 715
 716                 return error;
 717         }
 718
 719         if (exists) {
 720                 if ((info->flags & GIT_CPDIR_OVERWRITE) == 0)
 721                         return 0;
 722
 723                 if (p_unlink(info->to.ptr) < 0) {
 724                         giterr_set(GITERR_OS, "Cannot overwrite existing file '%s'",
 725                                 info->to.ptr);
 726                         return -1;
 727                 }
 728         }
 729
 730         /* Done if this isn't a regular file or a symlink */
 731         if (!S_ISREG(from_st.st_mode) &&
 732                 (!S_ISLNK(from_st.st_mode) ||
 733                  (info->flags & GIT_CPDIR_COPY_SYMLINKS) == 0))
 734                 return 0;
 735
 736         /* Make container directory on demand if needed */
 737         if ((info->flags & GIT_CPDIR_CREATE_EMPTY_DIRS) == 0 &&
 738                 git_futils_mkdir(
 739                         info->to.ptr, NULL, info->dirmode, info->mkdir_flags) < 0)
 740                 return -1;
 741
 742         /* make symlink or regular file */
 743         if (S_ISLNK(from_st.st_mode))
 744                 return cp_link(from->ptr, info->to.ptr, (size_t)from_st.st_size);
 745         else
 746                 return git_futils_cp(from->ptr, info->to.ptr, from_st.st_mode);
 747 }
 748
 749 int git_futils_cp_r(
 750         const char *from,
 751         const char *to,
 752         uint32_t flags,
 753         mode_t dirmode)
 754 {
 755         int error;
 756         git_buf path = GIT_BUF_INIT;
 757         cp_r_info info;
 758
 759         if (git_buf_sets(&path, from) < 0)
 760                 return -1;
 761
 762         info.to_root = to;
 763         info.flags   = flags;
 764         info.dirmode = dirmode;
 765         info.from_prefix = path.size;
 766         git_buf_init(&info.to, 0);
 767
 768         /* precalculate mkdir flags */
 769         if ((flags & GIT_CPDIR_CREATE_EMPTY_DIRS) == 0) {
 770                 info.mkdir_flags = GIT_MKDIR_PATH | GIT_MKDIR_SKIP_LAST;
 771                 if ((flags & GIT_CPDIR_CHMOD) != 0)
 772                         info.mkdir_flags |= GIT_MKDIR_CHMOD_PATH;
 773         } else {
 774                 info.mkdir_flags =
 775                         ((flags & GIT_CPDIR_CHMOD) != 0) ? GIT_MKDIR_CHMOD : 0;
 776         }
 777
 778         error = _cp_r_callback(&info, &path);
 779
 780         git_buf_free(&path);
 781         git_buf_free(&info.to);
 782
 783         return error;
 784 }
 785
 786 int git_futils_filestamp_check(
 787         git_futils_filestamp *stamp, const char *path)
 788 {
 789         struct stat st;
 790
 791         /* if the stamp is NULL, then always reload */
 792         if (stamp == NULL)
 793                 return 1;
 794
 795         if (p_stat(path, &st) < 0)
 796                 return GIT_ENOTFOUND;
 797
 798         if (stamp->mtime == (git_time_t)st.st_mtime &&
 799                 stamp->size  == (git_off_t)st.st_size   &&
 800                 stamp->ino   == (unsigned int)st.st_ino)
 801                 return 0;
 802
 803         stamp->mtime = (git_time_t)st.st_mtime;
 804         stamp->size  = (git_off_t)st.st_size;
 805         stamp->ino   = (unsigned int)st.st_ino;
 806
 807         return 1;
 808 }
 809
 810 void git_futils_filestamp_set(
 811         git_futils_filestamp *target, const git_futils_filestamp *source)
 812 {
 813         assert(target);
 814
 815         if (source)
 816                 memcpy(target, source, sizeof(*target));
 817         else
 818                 memset(target, 0, sizeof(*target));
 819 }