Check for chmod, hardlink, symlink, and special character support to
prevent test suite failures in feature constrained environments.
Thanks to Bruno Haible and Nelson H. F. Beebe for their testing and
analysis.
* tests/test-lib.sh: Add new feature tests.
* tests/hardlinks: Split this hardlinks related test off from
tests/remember-backup-files.
* tests/Makefile.am (TESTS): Add new hardlinks test here.
* tests/file-create-modes, tests/file-modes, tests/read-only-files,
tests/preserve-mode-and-timestamp, tests/no-mode-change-git-diff: These
tests require chmod support.
* tests/hardlinks, tests/unmodified-files: These tests require hardlink
support.
* tests/symlinks: This test requires symlink support.
* tests/quoted-filenames: This test requires special character support
in filenames.
Switch to single intervals for FSF notices,
and consistently put them first.
Update copyright notices for 2024.
* cfg.mk (update-copyright-env): Use UPDATE_COPYRIGHT_FORCE=1,
UPDATE_COPYRIGHT_USE_INTERVALS=2.
* patch.man: Always use \(co, so that update-copyright
updates these dates.
* src/version.c: Correct Larry Wall copyright years.
Reported and fixed (mostly) by Christian Weisgerber <naddy@mips.inka.de>:
* tests/deep-directories: Avoid the bash >& redirection operator.
* tests/no-mode-change-git-diff: Instead of "stat -c", use "ls -l sed".
* tests/read-only-files: A redirection failure for a special built-in causes
some shells (FreeBSD sh, OpenBSD sh (pdksh), some bash --posix) to exit, and
the colon command is a special built-in. Perform the redirection in a subshell.
