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v0.16.2: first stable 0.16.x release
This stable release ends the testing stage on the 0.16 branch. From
now on, new 0.16.x versions will only be released to fix serious
bugs, if found. Development towards 0.18.0 is continuing on the Git
master branch.
Below is a summary of the most important changes between
v0.16.1-alpha and v0.16.2. For full details, see the git log
(which has very descriptive commit messages).
CHANGED:
* 'str ematch' now properly supports full POSIX Extended Regular
Expressions (EREs) on all shells and operating systems,
including bounds/interval expressions and POSIX character
classes. On shells without this feature built in, 'str ematch'
now uses an awk script that converts a POSIX ERE to a
traditional awk RE before matching it. Related changes:
- The WRN_EREBOUNDS warning ID is removed.
- A new WRN_EREMBYTE warning ID is added. If 'thisshellhas
WRN_EREMBYTE', you're in a multibyte (UTF-8) locale but the
system's awk does not support UTF-8 characters, so 'str
ematch' cannot match these properly in EREs.
* New 'chdir' command, a robust 'cd' replacement for script use.
A replacement for 'cd' in scripts is needed because 'cd' has
features designed for interactive shells that make robust and
portable use in scripts far too difficult: (1) a user's
exported $CDPATH could easily cause the wrong directory to be
entered; (2) certain names are interpreted as special operands
even after '--', so using arbitrary/untrusted directory names
is not safe, and (3) the PWD it sets is not safe against
symlink attacks by default.
It is possible to work around these problems, but this is
only really doable with a library function like chdir. The use
of 'cd' in modernish scripts is now deprecated.
* Modernish commands that handle long-form shell options (such as
'push -o OPTION', 'pop -o OPTION') now deal correctly with
abbreviated shell option names on shells where these can
natively be abbreviated: ksh93 and yash. This capability is now
detected under the ID QRK_OPTABBR.
* mktemp (sys/base/mktemp):
- the -t option now uses the XDG_RUNTIME_DIR environment
variable if set. It also no longer dies if that or TMPDIR has
a bad value; it just won't use it.
- the -C autocleanup option can now be used in a subshell
alongside -s and using the tmp file name left in $REPLY
(not that autocleanup happens on exiting the subshell).
* readlink (sys/base/readlink):
- Added the canonicalisation options '-e' (all pathname
components must exist) and '-m' (none need exist) as in
GNU 'readlink'.
- Now supports //UNC/network/paths on Cygwin.
* which (sys/base/which) now converts relative paths it finds
to absolute paths, a behaviour that matches GNU 'which'.
* var/loop: Iteration generator processes can now read from
standard input as normal (except on interactive shells).
And stdout is now redirected to stderr instead of closed.
* LOOP find (var/loop/find):
- Now supports portable use of the GNU-style '-mindepth n' and
'-maxdepth n' options, as well as the BSD-style '-depth n',
'-depth -n', '-depth +n' expression primary. These are
internally translated to a portable expression.
- Since loop iteration generators can now read from standard
input, LOOP find now accepts the -ok and -okdir primaries.
* In modernish safe pathname expansion (var/local, var/loop),
resulting paths starting with '+' are now also automatically
escaped by prefixing './', because some commands have options
or special operands that start with '+'.
* New example program: Modernish Dice.
See: share/doc/modernish/dice.sh
* Unfortunately, the latest Korn shell 2020.0.0 release is too
buggy to run modernish. One of its many bugs is that EXIT traps
don't work in subshells: att/ast#1452
There is no possible workaround, so this is a fatal bug.
Modernish now refuses to initialise upon detecting this bug.
The only ksh93 release known to work is AJM 93u+ 2012-08-01.
* Changes in shell capability IDs for thisshellhas:
- OPTNOPREFIX is renamed to QRK_OPTNOPRFX.
- New shell bugs/quirks detected and identified:
BUG_CMDSETPP (mksh <= R57)
BUG_ASGNLOCAL (zsh <= 5.7.1)
BUG_CASEPAREN (bash 3.2)
- New shell quirks detected and identified:
QRK_ANDORBG (zsh)
QRK_OPTABBR (ksh93, yash)
* On interactive shells, if a command in a multi-process job
calls die(), the entire job is now reliably interrupted.
FIXED:
* On shells with BUG_PUTIOERR, the var/loop module now refuses to
initialise if SIGPIPE is ignored. This avoids loop iteration
generators being stuck writing infinitely into the void.
* thisshellhas: the --cache or --show options could end up in
an infinite loop upon encountering a cap/*.t file with an
invalid ID name.
* shellquote: assignment-arguments didn't work for values
exempt from quoting like: shellquote var=[.
* sys/base/seq: the -f option did not correctly handle arbitrary
format strings.
* put/putln died on I/O error on FreeBSD sh.
* str:
- For an empty variable $empty (which is removed when unquoted,
even in the safe mode), str returned the wrong result for:
str {eq,ne,in,begin,end,match} $empty ""
str isvarname $empty
- str match: handling of a dangling final backslash was broken.
- str ematch: on shells where this depends on awk, arguments
starting with a dash failed because they were misinterpreted
as awk options.
* mapr (var/mapr):
- Empty input caused an infinite loop.
- "Arguments list too long" errors still occasionally occurred
on some systems when using mapr with external commands. Fixed
by using a much more conservative arguments length limit.
* LOOP select (var/loop/select) didn't cope with REPLY being
unset within the loop.
* trace (sys/cmd/harden): Traced commands died on status 128.
* use: Modules could be erroneously loaded/initialised more than
once if a slightly different variant of the name was given: a
leading or trailing slash, or a double slash. Fixed by
detecting these variants as invalid.
* % (sys/cmd/procsubst):
- Would hang on AT&T ksh93. Fixed by forcing the non-forked
command substitution subshell to fork.
- Work around an AT&T ksh93 bug with the 'command' command,
so that e.g. 'cat < $(% command ls)' now works on ksh93.
- With '% -o', standard output was closed for the launched
command. Fixed by redirecting it to standard error.
- Die on no command given and on empty command.
* LOOP repeat (var/loop/repeat): died with a spurious "invalid
arithmetic expression" error message on 0 interations.
* readlink (sys/base/readlink):
- The --help option wasn't parsed correctly.
- When canonicalising a path ending in '/', readlink would
erroneously print the final '/'.
- Encountering a recursive symlink would cause an infinite
loop. Fixed by keeping track of symlinks already seen.
* which (sys/base/which): Given an existing '/command' in the
root directory, 'PATH=/:$PATH; which command' yielded
'//command', and 'which /command' did not work at all.
* var/stack/trap:
- The logic for resending a signal (in case traps were pushed
but no POSIX trap is set) was broken, so that e.g. TSTP
failed to stop the shell, among other bugs.
- On some shells, CHLD stack traps would trigger themselves,
causing infinite signal loops.
- DIE/INT traps on interactive shells were broken when they
themselves called die(), causing ugly misbehaviour.
- On zsh, 'trap' did not print ZERR/ERR traps correctly.
- poptrap: A stack corruption fatal error occurred when
attempting to pop a trap in a subshell.
OPTIMISED:
* var/loop/select: Stop iteration generator while waiting for
reply. This makes 'LOOP select' much better behaved: we avoid
filling up the interprocess buffer while still remaining
responsive if a user gives many replies in quick succession.- Loading branch information
