Adding upstream version 9.1.upstream/9.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 202 insertions, 0 deletions

diff --git a/lib/mkdir-p.c b/lib/mkdir-p.c
new file mode 100644
index 0000000..00651e9
--- /dev/null
+++ b/lib/mkdir-p.c
@@ -0,0 +1,202 @@
+/* mkdir-p.c -- Ensure that a directory and its parents exist.
+
+   Copyright (C) 1990, 1997-2000, 2002-2007, 2009-2022 Free Software
+   Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Paul Eggert, David MacKenzie, and Jim Meyering.  */
+
+#include <config.h>
+
+#include "mkdir-p.h"
+
+#include <errno.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "gettext.h"
+#define _(msgid) gettext (msgid)
+
+#include "dirchownmod.h"
+#include "dirname.h"
+#include "error.h"
+#include "quote.h"
+#include "mkancesdirs.h"
+#include "savewd.h"
+
+#ifndef HAVE_FCHMOD
+# define HAVE_FCHMOD false
+#endif
+
+/* Ensure that the directory DIR exists.
+
+   WD is the working directory, as in savewd.c.
+
+   If MAKE_ANCESTOR is not null, create any ancestor directories that
+   don't already exist, by invoking MAKE_ANCESTOR (DIR, ANCESTOR, OPTIONS).
+   This function should return zero if successful, -1 (setting errno)
+   otherwise.  In this case, DIR may be modified by storing '\0' bytes
+   into it, to access the ancestor directories, and this modification
+   is retained on return if the ancestor directories could not be
+   created.
+
+   Create DIR as a new directory, using mkdir with permissions MODE;
+   here, MODE is affected by the umask in the usual way.  It is also
+   OK if MAKE_ANCESTOR is not null and a directory DIR already exists.
+
+   Call ANNOUNCE (DIR, OPTIONS) just after successfully making DIR,
+   even if some of the following actions fail.
+
+   Set DIR's owner to OWNER and group to GROUP, but leave the owner
+   alone if OWNER is (uid_t) -1, and similarly for GROUP.
+
+   Set DIR's mode bits to MODE, except preserve any of the bits that
+   correspond to zero bits in MODE_BITS.  In other words, MODE_BITS is
+   a mask that specifies which of DIR's mode bits should be set or
+   cleared.  Changing the mode in this way is necessary if DIR already
+   existed, if MODE and MODE_BITS specify non-permissions bits like
+   S_ISUID, or if MODE and MODE_BITS specify permissions bits that are
+   masked out by the umask.  MODE_BITS should be a subset of
+   CHMOD_MODE_BITS.
+
+   However, if PRESERVE_EXISTING is true and DIR already exists,
+   do not attempt to set DIR's ownership and file mode bits.
+
+   Return true if DIR exists as a directory with the proper ownership
+   and file mode bits when done, or if a child process has been
+   dispatched to do the real work (though the child process may not
+   have finished yet -- it is the caller's responsibility to handle
+   this).  Report a diagnostic and return false on failure, storing
+   '\0' into *DIR if an ancestor directory had problems.  */
+
+bool
+make_dir_parents (char *dir,
+                  struct savewd *wd,
+                  int (*make_ancestor) (char const *, char const *, void *),
+                  void *options,
+                  mode_t mode,
+                  void (*announce) (char const *, void *),
+                  mode_t mode_bits,
+                  uid_t owner,
+                  gid_t group,
+                  bool preserve_existing)
+{
+  int mkdir_errno = (IS_ABSOLUTE_FILE_NAME (dir) ? 0 : savewd_errno (wd));
+
+  if (mkdir_errno == 0)
+    {
+      ptrdiff_t prefix_len = 0;
+      int savewd_chdir_options = (HAVE_FCHMOD ? SAVEWD_CHDIR_SKIP_READABLE : 0);
+
+      if (make_ancestor)
+        {
+          prefix_len = mkancesdirs (dir, wd, make_ancestor, options);
+          if (prefix_len < 0)
+            {
+              if (prefix_len < -1)
+                return true;
+              mkdir_errno = errno;
+            }
+        }
+
+      if (0 <= prefix_len)
+        {
+          /* If the ownership might change, or if the directory will be
+             writable to other users and its special mode bits may
+             change after the directory is created, create it with
+             more restrictive permissions at first, so unauthorized
+             users cannot nip in before the directory is ready.  */
+          bool keep_owner = owner == (uid_t) -1 && group == (gid_t) -1;
+          bool keep_special_mode_bits =
+            ((mode_bits & (S_ISUID | S_ISGID)) | (mode & S_ISVTX)) == 0;
+          mode_t mkdir_mode = mode;
+          if (! keep_owner)
+            mkdir_mode &= ~ (S_IRWXG | S_IRWXO);
+          else if (! keep_special_mode_bits)
+            mkdir_mode &= ~ (S_IWGRP | S_IWOTH);
+
+          if (mkdir (dir + prefix_len, mkdir_mode) == 0)
+            {
+              /* True if the caller does not care about the umask's
+                 effect on the permissions.  */
+              bool umask_must_be_ok = (mode & mode_bits & S_IRWXUGO) == 0;
+
+              announce (dir, options);
+              preserve_existing = (keep_owner & keep_special_mode_bits
+                                   & umask_must_be_ok);
+              savewd_chdir_options |= SAVEWD_CHDIR_NOFOLLOW;
+            }
+          else
+            {
+              mkdir_errno = errno;
+              mkdir_mode = -1;
+            }
+
+          if (preserve_existing)
+            {
+              if (mkdir_errno == 0)
+                return true;
+              if (mkdir_errno != ENOENT && make_ancestor)
+                {
+                  struct stat st;
+                  if (stat (dir + prefix_len, &st) == 0)
+                    {
+                      if (S_ISDIR (st.st_mode))
+                        return true;
+                    }
+                  else if (mkdir_errno == EEXIST
+                           && errno != ENOENT && errno != ENOTDIR)
+                    {
+                      error (0, errno, _("cannot stat %s"), quote (dir));
+                      return false;
+                    }
+                }
+            }
+          else
+            {
+              int open_result[2];
+              int chdir_result =
+                savewd_chdir (wd, dir + prefix_len,
+                              savewd_chdir_options, open_result);
+              if (chdir_result < -1)
+                return true;
+              else
+                {
+                  bool chdir_ok = (chdir_result == 0);
+                  char const *subdir = (chdir_ok ? "." : dir + prefix_len);
+                  if (dirchownmod (open_result[0], subdir, mkdir_mode,
+                                   owner, group, mode, mode_bits)
+                      == 0)
+                    return true;
+
+                  if (mkdir_errno == 0
+                      || (mkdir_errno != ENOENT && make_ancestor
+                          && errno != ENOTDIR))
+                    {
+                      error (0, errno,
+                             _(keep_owner
+                               ? "cannot change permissions of %s"
+                               : "cannot change owner and permissions of %s"),
+                             quote (dir));
+                      return false;
+                    }
+                }
+            }
+        }
+    }
+
+  error (0, mkdir_errno, _("cannot create directory %s"), quote (dir));
+  return false;
+}