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* eval: Reset handler when entering a subshellHerbert Xu2019-03-28
| | | | | | | | | | As it is a subshell can execute code that is only meant for the parent shell when it executes a longjmp that is caught by something like evalcommand. This patch fixes it by resetting the handler when entering a subshell. Reported-by: Martijn Dekker <martijn@inlv.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Only restore exit status on exit/returnHerbert Xu2019-02-25
| | | | | | | | | | We unconditionally restore the saved status in exitreset, which is incorrect as we only want to do it for exitcmd and returncmd. This patch fixes the problem by introducing EXEND. Reported-by: Martijn Dekker <martijn@inlv.org> Fixes: da30b4b78769 ("[BUILTIN] Exit without arguments in a trap...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* main: Print \n upon EOF (CTRL-D) when run interactivelyGerrit Pape2018-11-19
| | | | | | | | | | | | | | | | | | | | | | Exiting dash via a ^D instead of with "exit" causes dash to forget to print a newline. sh-3.1$ sh sh-3.1$ ^D sh-3.1$ dash $ sh-3.1$ It is more neat and tidy to send a newline similarly to what bash does, so it doesn't make the next prompt of the parent shell look ugly. Suggested by jidanni. Signed-off-by: Gerrit Pape <pape@smarden.org> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> [reworded the patch description] Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk> Bug-Debian: http://bugs.debian.org/476422 Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* exec: Stricter pathopt parsingHerbert Xu2018-05-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch changes the parsing of pathopt. First of all only %builtin and %func (with arbitrary suffixes) will be recognised. Any other pathopt will be treated as a normal directory. Furthermore, pathopt can now be specified before the directory, rather than after it. In fact, a future version may remove support for pathopt suffixes. Wherever the pathopt is placed, an optional % may be placed after it to terminate the pathopt. This is so that it is less likely that a genuine directory containing a % sign is parsed as a pathopt. Users of padvance outside of exec.c have also been modified: 1) cd(1) will always treat % characters as part of the path. 2) chkmail will continue to accept arbitrary pathopt. 3) find_dot_file will ignore the %builtin pathopt instead of trying to do a stat in the accompanying directory (which is usually the current directory). The patch also removes the clearcmdentry optimisation where we attempt to only partially flush the table where possible. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* exec: Do not allocate stack string in padvanceHerbert Xu2018-05-28
| | | | | | | | | | | Many callers of padvance immediately free the allocated string so this patch moves the stalloc call to the caller. Instead of returning the allocated string, padvance now returns the length to allocate (this may be longer than the actual string length, even including the NUL). For the case where we would previously return NULL, we now return -1. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* mkinit: Split reset into exitreset and resetHerbert Xu2018-05-28
| | | | | | | | | | | | | Previously reset was called after exitshell. This was changed so that it was called before exitshell because certain state needed to be reset in order for the EXIT trap to work. However, this caused issues because certain other states (such as local variables) should not be reset. This patch fixes this by creating a new function exitreset that is called prior to exitshell and moving reset back to its original location. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* main: Only set savestatus in exitcmdHerbert Xu2018-05-28
| | | | | | | | | | Currently exitcmd sets exitstatus and then savestatus if the latter was previously set. In fact, as exitcmd always raises an exception and will either end up in the setjmp call in main() or exitshell(), where exitstatus is always replaced by savestatus if set, we only need to set savestatus. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Return status in eval functionsHerbert Xu2016-09-02
| | | | | | | | | | The exit status is currently clobbered too early for case statements and loops. This patch fixes it by making the eval functions return the current exit status and setting them in one place -- evaltree. Harald van Dijk pointed out a number of bugs in the original patch. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Fix exit status when calling eval/dot with no commandsHarald van Dijk2016-06-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On 17/11/2015 03:18, Gioele Barabucci wrote: > Hello, > > a bug has been filed in the Debian BTS about dash not resetting the exit > status after sourcing an empty file with the dot command. [1] > > The following test echoes "OK" with bash and "fail" with dash > > #!/bin/sh > > echo > ./empty > false > > . ./empty && echo "OK" || echo "fail" > > A similar bug in dash has been discussed and addressed in 2011 [2], but > it looks like the solution has been only partial. > > The version of dash I tested is the current git master branch, commit > 2e58422. > > [1] https://bugs.debian.org/777262 > [2] http://article.gmane.org/gmane.comp.shells.dash/531 The bug described there was about empty files. While the fix has been applied and does make dash handle empty files properly, your test doesn't use an empty file, it uses a file containing a single blank line. Unfortunately, the single blank line gets parsed by dash as a null command, null commands don't (and shouldn't) reset the exit status, and the fix you link to doesn't handle this because it sees a command has been executed and saves the exit status after executing that command as the exit status to be used by ".". I think the easiest way to fix this is to prevent null commands from affecting status in cmdloop, as attached. An alternative could be to change the outer if condition to exclude n == NULL, but I didn't do that because the change of job_warning and clearing of numeof make sense to me even for null commands. Besides, when debug tracing is enabled, null commands have a visible effect that should remain. Note that this fixes the problem with . but the same problem can be present in other locations. For example, false eval " " && echo OK || echo Fail used to print Fail, and needed the same modification in the evalstring function to make that print OK (included in the attached patch). There may be other similar bugs lurking. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* input: Remove HETIOHerbert Xu2015-01-05
| | | | | | | It hasn't been possible to build HETIO for over ten years. So let's just kill it. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Handle -- in dotcmdHerbert Xu2014-10-27
| | | | | | | This patch adds a nextopt call in dotcmd in order to handle --. Reported-by: Stephane Chazelas <stephane_chazelas@yahoo.fr> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Return without arguments in a trap should use status outside trapsHerbert Xu2014-10-06
| | | | | | | | | | | | | POSIX now requires that return without arguments in a trap should return the last command status prior to executing traps. This patch implements this behaviour. Incidentally this also changes the behaviour of return without arguments in a loop conditional to use the last exit status in the body as opposed to the last command in the conditional when there is one. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Exit without arguments in a trap should use status outside trapsHerbert Xu2014-10-06
| | | | | | | | POSIX now requires that exit without arguments in a trap should return the last command status prior to executing traps. This patch implements this behaviour. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Merge SKIPFUNC/SKIPFILE and only clear SKIPFUNC when leaving dotcmdHerbert Xu2011-07-09
| | | | | | | | | | | | | | | | Currently upon leaving a dotcmd the evalskip state is reset so if a continue/break statement is used within a dot script it would have no effect outside of the dot script. This is inconsistent with other shells. This patch is based on one by Jilles Tjoelker and only clears SKIPFUNC when leaving a dot script. As a result continue/break will remain in effect. It also merges SKIPFUNC/SKIPFILE as they have no practical difference. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [SHELL] Optimize dash -c "command" to avoid a forkHerbert Xu2011-07-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Sun, Apr 10, 2011 at 07:36:49AM +0000, Jonathan Nieder wrote: > From: Jilles Tjoelker <jilles@stack.nl> > Date: Sat, 13 Jun 2009 16:17:45 -0500 > > This change only affects strings passed to -c, when the -s option is > not used. > > Use the EV_EXIT flag to inform the eval machinery that the string > being passed is the entirety of input. This way, a fork may be > omitted in many special cases. > > If there are empty lines after the last command, the evalcmd will not > see the end early enough and forks will not be omitted. The same thing > seems to happen in bash. > > Example: > sh -c 'ps lT' > No longer shows a shell process waiting for ps to finish. > > [jn: ported from FreeBSD SVN r194128. Bugs are mine.] > > Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Instead of detecting EOF using the input layer, I'm going to use the parser instead. In either case, we always have to read ahead in order to complete the parsing of the previous node. Therefore we always know whether there is more to come, except in the case where we see a newline/semicolon or similar. For the purposes of sh -c, this should be sufficient. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Dotcmd should exit with zero when doing nothingJonathan Nieder2011-03-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | Tim Allen wrote: > The POSIX specification for the dot command[1] states: > > EXIT STATUS > Returns the value of the last command executed, or a zero exit > status if no command is executed. > > If an empty file is sourced, then "no command is executed" I agree. Looking through "git log --patch src/main.c", though, I find v0.5.3~42 (Do not clobber exit status in dotcmd., 2005-03-03), which appears to have been meant to take care of the following case: $ cat printstatus.sh echo $? $ false $ . ./printstatus.sh 1 I wonder if the following on top might help (imitating evalcmd)? Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [ERROR] Allow the originator of EXERROR to set the exit statusHerbert Xu2010-11-28
| | | | | | | | Some errors have exit status values specified by POSIX and it is therefore desirable to be able to set the exit status at the EXERROR source rather than in main.c. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EVAL] Revert SKIPEVAL into EXEXITHerbert Xu2009-08-11
| | | | | | | Now that eval handles EV_TESTED correctly, we can remove the SKIPEVAL hack and simply use EXEXIT for set -e. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [OPTIONS] Added support for -lHerbert Xu2008-07-13
| | | | | | | This patch adds support for the -l option (login shell) as required by the LSB. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [SHELL] Expand ENV before using itHerbert Xu2008-07-13
| | | | | | Per POSIX ENV needs to undergo parameter expansion. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* Copyright/licence updates and remove all traces of sys/cdefs.hHerbert Xu2005-10-29
| | | | | | | | | | | This change updates the BSD licence to the three-clause version since NetBSD has already done so. This makes dash GPL-compatible. It also adds Christos Zoulas (NetBSD ash maintainer) to the COPYING file. I've added "copyright by Herbert Xu" to most files. Finally all CVS IDs and inclusion of sys/cdefs.h have been removed. The latter is needed for support of klibc.
* Added eflag fixes for trap and minusc.herbert2005-09-26
| | | | | | Let evaltree handle traps from cmdloop. Reset evalskip after minusc is executed. Stop executing traps once SKIPEVAL is seen.
* Let evaltree handle traps from cmdloop.herbert2005-09-26
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* Handle SKIPEVAL in read_profile by exiting.herbert2005-09-26
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* Generalise setinputfile for use in read_profile/readcmdfile.herbert2005-09-26
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* Do not clobber exit status in dotcmd.herbert2005-09-26
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* Removed redundant setstackmark from dotcmd.herbert2005-09-26
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* Removed qflag.herbert2005-09-26
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* Renamed error to sh_error.herbert2005-09-26
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* Replaced EXEVAL with SKIPEVAL.herbert2005-09-26
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* Optimise away status and case statement in main().herbert2005-09-26
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* Eliminated global exerrno.herbert2005-09-26
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* Size optimisations with state/s in main().herbert2005-09-26
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* Catch set -e exits within built-in commands.herbert2005-09-26
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* Changed boolean rootshell into shlvl counter.herbert2005-09-26
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* Initial import.Herbert Xu2005-09-26