Sync from coreutils.

Sync from coreutils.

* doc/getdate.texi (General date syntax): Invalid dates are rejected.
(Time of day items): Mention the possibility of leap seconds.
Problem reported by Dr. David Alan Gilbert.

* lib/chdir-long.c (cdb_free): Don't bother trying to open directory
for write access: POSIX says that must fail.
* lib/fts.c (diropen): Likewise.
* lib/save-cwd.c (save_cwd): Likewise.
* lib/chdir-long.c (cdb_free): Open with O_NOCTTY | O_NONBLOCK as
well, for minor improvements on hosts that lack O_DIRECTORY.

* lib/gettime.c (gettime) [!defined OK_TO_USE_1S_CLOCK]:
Report an error at compile-time if only a 1-second nominal clock
resolution is found.

* lib/lchmod.h: New file.
* lib/mkdir-p.c: Include lchmod.h, lchown.h.
(make_dir_parents): Use lchown rather than chown, and
lchmod rather than chmod.

* lib/mountlist.c (ME_DUMMY): "none" and "proc" file systems are dummies
too.  Problem with "none" reported by Bob Proulx.  Problem with
"proc" reported by n0dalus.

* lib/mountlist.c: Include <limits.h>.
(dev_from_mount_options)
[defined MOUNTED_GETMNTENT1 || defined MOUNTED_GETMNTENT2]:
New function.  It no longer assumes "dev=" has the System V meaning
on Linux (since it doesn't).  It also parses "dev=" more carefully.
(read_file_system_list)
[defined MOUNTED_GETMNTENT1 || defined MOUNTED_GETMNTENT2]: Use it.
MOUNTED_GETMNTENT2 is new here; the code didn't used to look for
dev= in that case.

* lib/posixtm.h (PDS_PRE_2000): New macro.
* lib/posixtm.c (year): Arg is now syntax_bits rather than allow_century.
All usages changed.  Reject dates outside the range 1969-1999 if
PDS_PRE_2000 is used.

* modules/mkdir-p (Files): Add chdir-safer.c, chdir-safer.h, lchmod.h,
chdir-safer.m4, lchmod.m4.
* modules/openat: Add mkdirat.c, openat-priv.h.
* modules/lib-ignore: New file.

* lib/version-etc.c (COPYRIGHT_YEAR): Update to 2006.

Rewrite fts.c not to change the current working directory,
by using openat, fstatat, fdopendir, etc..

* lib/fts.c [! _LIBC]: Include "openat.h", "unistd--.h", and "fcntl--.h".
[_LIBC] (fchdir): Don't undef or define; no longer used.
(FCHDIR): Define in terms of cwd_advance_fd rather than fchdir.
Now, this `function' always succeeds, and consumes its file descriptor
parameter -- so callers must not close such FDs.  Update callers.
(diropen_fd, opendirat, cwd_advance_fd): New functions.
(diropen): Add parameter, SP.  Adjust all callers.
Implement using diropen_fd, rather than open.
(fts_open): Initialize new member, fts_cwd_fd.
Remove fts_rft-setting code.
(fts_close): Close fts_cwd_fd, if necessary.
(__opendir2): Define in terms of opendir or opendirat,
depending on whether the FST_NOCHDIR flag is set.
(fts_build): Since fts_safe_changedir consumes its FD, and since
this code must do `closedir(dirp)', dup the dirfd(dirp) argument,
and close the dup'd file descriptor upon failure.
(fts_stat): Use fstatat(...AT_SYMLINK_NOFOLLOW) in place of lstat.
(fts_safe_changedir): Tweak semantics to reflect that this function
now calls cwd_advance_fd and hence consumes its FD argument.
* lib/fts_.h [struct FTS] (fts_cwd_fd): New member.
(fts_rft): Remove now-unused member.

* lib/openat.c (fchownat): New function.
* lib/openat.h (fchmodat, fchownat): Declare.
(chmodat, lchmodat): Define convenience functions.
(chownat, lchownat): Likewise.

* lib/chdir-safer.h, chdir-safer.c: New files.

* lib/modechange.c (mode_compile): Reject an invalid mode string
that starts with an octal digit.  From Andreas Gruenbacher.

* lib/openat.c: Include "fcntl--.h" and "unistd--.h", to map open
and dup to open_safer and dup_safer, respectively.
(openat_permissive): Fix typo in comment.

* lib/openat.c: Don't include <stdlib.h>, <unistd.h>, <fcntl.h>,
"gettext.h"; either no longer needed or are guaranteed by openat.h.
(_): Remove; no longer needed.
(openat): Renamed from rpl_openat; no need for rpl_openat
since openat.h renames openat for us.
Replace most of the body with a call to openat_permissive,
to avoid duplicate code.
Port to (probably hypothetical) environments were mode_t is
wider than int.
(openat_permissive): Require mode arg, so that we can check
types better.  Put it just after flags.  Change cwd failure
indicator from pointer-to-bool to pointer-to-errno-value.
All callers changed.
Invoke openat_save_fail and/or openat_restore_fail if
cwd_errno is null, so that openat can call us.
(openat_permissive, fdopendir, fstatat, unlinkat):
Simplify errno handling to avoid some duplicate code,
as it's OK to set errno on success.
* lib/openat.h: Revamp code so that function macros depend on
__OPENAT_PREFIX only, not also on AT_FDCWD.
(openat_ro): Remove.  Caller changed to use openat_permissive.
(openat_permissive): Now a macro, if not a function.
(openat_restore_fail, openat_save_fail): Now always functions,
since mkdirat needs them even if __OPENAT_PREFIX is defined.

* lib/openat-priv.h: New file, defining macros used by mkdirat.c
and openat.c.
* lib/mkdirat.c: Include openat-priv.h.
Remove definitions of macros defined therein.
* lib/openat.c: Likewise.

* lib/mkdirat.c (mkdirat): New file and function.
* lib/openat.h (mkdirat): Declare.

* lib/openat.c (fdopendir): Don't change errno when returning non-NULL.

* lib/openat.h (openat_permissive): Declare.
(openat_ro): Define.

* lib/openat.c (EXPECTED_ERRNO): New macro.
(openat_permissive): New function -- used in remove.c rewrite.
(all functions): Set errno just before returning, only if there
was an actual failure.
Use EXPECTED_ERRNO rather than comparing against only ENOTDIR.

Emulate openat-family functions using Linux's procfs, if possible.
Idea and some code based on Ulrich Drepper's glibc changes.

* lib/openat.c: (BUILD_PROC_NAME): New macro.
Include <stdio.h>, <string.h>, "alloca.h" and "intprops.h".
(rpl_openat): Emulate by trying to open /proc/self/fd/%d/%s,
before falling back on save_cwd and restore_cwd.
(fdopendir, fstatat, unlinkat): Likewise.

* lib/openat.c (fstatat, unlinkat): Perform the syscall directly,
skipping the save_cwd...restore_cwd overhead, if FILE is absolute.

* lib/openat.c (rpl_openat): Use the promoted type (int), not mode_t,
as second argument to va_arg.  Otherwise, some versions of gcc
warn that `if this code is reached, the program will abort'.

Add POSIX ACL support
* lib/acl.h (copy_acl, set_acl): Add declarations.
* lib/acl.c (acl_entries): Add fallback implementation for POSIX ACL
systems other than Linux.
(chmod_or_fchmod): New function: use fchmod when possible,
and chmod otherwise.
(file_has_acl): Add a POSIX ACL implementation, with a
Linux-specific subcase.
(copy_acl): Add: copy an acl and S_ISUID, S_ISGID, and
S_ISVTX from one file to another.  Fall back to fchmod/chmod when
acls are unsupported.
(set_acl): Add: set a file's acl and S_ISUID, S_ISGID, and
S_ISVTX to a defined value.  Fall back to fchmod/chmod when acls
are unsupported.

* m4/lib-ignore.m4: New file.
* m4/lchmod.m4: New file.

* m4/chdir-safer.m4: New file.
* m4/openat.m4 (gl_FUNC_OPENAT): Require and compile mkdirat.c.
Require openat-priv.h.

* m4/acl.m4 (AC_FUNC_ACL): Add POSIX ACL and Linux-specific acl tests.