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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>
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Document that `ulimit` can set the `RLIMIT_AS` limit (virtual memory) with
the `-v` flag.
Fixes: https://bugs.debian.org/78556
Reported-by: Vincent Lefevre <vincent@vinc17.net>
Signed-off-by: Gioele Barabucci <gioele@svario.it>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Ensure dash can build in a default Solaris 9 or older environment:
- Execute scripts with $SHELL rather than /bin/sh, the latter does not
support e.g. "if ! .." used by mkbuiltins.
- /bin/awk does not support ?: syntax, use explicit statements instead.
- /bin/nl requires no spaces between options and arguments.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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If job %0 is (mistakenly) specified, an out-of-bounds access to the
jobtab occurs in function getjob() if num = 0:
jp = jobtab + 0 - 1
Fix this by checking that the job number is larger than 0 before
accessing the jobtab.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Dash doesn't notice when a format string has digits following a * width
specifier.
$ dash -c 'printf "%*0s " 1 2 && echo FAIL || echo OK'
%10s FAIL
$ bash -c 'printf "%*0s " 1 2 && echo FAIL || echo OK'
bash: line 0: printf: `0': invalid format character
OK
$ mksh -c 'printf "%*0s " 1 2 && echo FAIL || echo OK'
printf: %*0: invalid conversion specification
OK
With this patch dash complains about the malformed specifications.
$ ./src/dash -c 'printf "%*0s " 1 2 && echo FAIL || echo OK'
./src/dash: 1: printf: %*0: invalid directive
OK
Fixes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=779618
Originally-by: Patrick Brown <opensource@whoopdedo.org>
Forwarded-by: Gioele Barabucci <gioele@svario.it>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The global variable t_wp_op needs to be reset every time testcmd
is called or it may cause incorrect parsing of the arguments.
Reported-by: Martijn Dekker <martijn@inlv.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The description of getops in the manual incorrectly states that
var will be set to "--" when no arguments remain. In fact it
will be set to "?".
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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In mkbuiltins LC_COLLATE is set, but since "The value of the LC_ALL
environment variable has precedence over any of the other environment
variables starting with LC_"
(http://pubs.opengroup.org/onlinepubs/7908799/xbd/envvar.html), this
has no effect when LC_ALL is set.
This breaks when having e.g. LC_ALL=en_US.UTF-8 during make, which
causes the test case
dash -c :
to fail, probably due to broken ordering in builtins.c. The patch
corrects that by clearing LC_ALL.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The commit ef91d3d6a4c39421fd3a391e02cd82f9f3aee4a8 ([PARSER]
Handle backslash newlines properly after dollar sign) created
cases where we make two consecutive calls to pungetc. As we
don't explicitly support that there are corner cases where you
end up with garbage input leading to undefined behaviour.
This patch adds explicit support for two consecutive calls to
pungetc.
Reported-by: Jilles Tjoelker <jilles@stack.nl>
Reported-by: Juergen Daubert <jue@jue.li>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Currently we maintain a copy of the input state outside of parsefile.
This is redundant and makes reentrancy difficult. This patch kills
the duplicate global states and now everyone simply uses parsefile.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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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>
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The function preadbuffer should be static as it's only used in
input.c.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The commit 3c06acdac0b1ba0e0acdda513a57ee6e31385dce ([EXPAND]
Split unquoted $@/$* correctly when IFS is set but empty) broke
the case where $@ is in quotes and EXP_FULL is false.
In that case we should still emit IFS as field splitting is not
performed.
Reported-by: Juergen Daubert <jue@jue.li>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Encontered this on ancient gcc-2.95.3 environment;
src/builtins.def.in -> src/builtins.def generation emitted
^ $
lines (likely by /* */), which where NOT ignored by
src/mkbuiltins and generating bogus builtins.c.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Close Debian Bug #501566
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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POSIX.1-2008 §4.4 "File Access Permission" sayeth:
If execute permission is requested, access shall be granted
if execute permission is granted to at least one user by the
file permission bits or by an alternate access control
mechanism; otherwise, access shall be denied.
For historical reasons, POSIX unfortunately also allows access() and
faccessat() to return success for X_OK if the current process is
privileged, even when the above condition is not fulfilled and actual
execution would fail. On the affected platforms, "test -x <path>" as
root started returning true on nonexecutable files when dash switched
from its own emulation to the true faccessat in v0.5.7~54
(2010-04-02).
Work around this by checking the permissions bits when mode == X_OK
and geteuid() == 0 on such platforms.
Unfortunately the behavior seems to vary from one kernel version to
another, so we cannot just check the behavior at compile time and rely
on that. A survey of some affected kernels:
- NetBSD's kernel moved to the sane semantics in 1997
- OpenBSD's kernel made the same change in version 4.4, three years
ago
- FreeBSD 9's kernel fixes this but hasn't been released yet
It seems safe to only apply the workaround on systems using the
FreeBSD kernel for now, and to push for standardization on the
expected access()/faccessat() semantics so we can drop the workaround
altogether in a few years.
To try it on other platforms, use "./configure --enable-test-workaround".
Reported-by: Christoph Egger <christoph@debian.org>
Analysis-by: Petr Salinger <Petr.Salinger@seznam.cz>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Currently we only check special variable names that follow directly
after $ or ${. So errors such as ${#&} are not caught. This patch
fixes that by moving the is_special check to just before we print out
the special variable name.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch simplifies the EOF and new handling in the list parser.
In particular, it eliminates a case where we may leave here-documents
unfinished upon EOF.
It also removes special EOF/newline handling from parsecmd.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Doing a pungetc on an EOF is a noop and is only useful when we
don't know what character we're putting back. This patch removes
an unnecessary pungetc when we know it's EOF.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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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>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch removes the duplicate octal handling for %b by reusing
the existing code in conv_escape.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch replaces uses of warnx where we abort with error since
the effect is the same. The exit status however changes from 1 to
2. Non-fatal errors where we continue are unchanged.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch removes getintmax and moves its functionality into
getuintmax in order to reduce code duplication.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Currently we try to preserve the format string which is stored in
argv after temporarily modifying it. This is unnecessary as it's
only ever used once. This patch gets rid of it.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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MEM_OUT is only used by forkless backtick processing which we do
not currently support.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The branch in outmem where the string fits in the buffer is the
common case and is now marked as likely.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=379227
On Sat, Jul 22, 2006 at 12:48:38PM +0200, A Mennucc wrote:
> Package: dash
> Version: 0.5.3-3
> Severity: normal
>
> hi
>
> here are the examples
>
> $ bash -c 'echo -n -e "A\0102C\00D\0E" | hexdump -c'
> 0000000 A B C \0 D \0 E
> 0000007
>
> $ /bin/echo -n -e "A\0102C\00D\0E" | hexdump -c
> 0000000 A B C \0 D \0 E
> 0000007
>
> $ zsh -c 'echo -n -e "A\0102C\00D\0E" | hexdump -c'
> 0000000 A B C \0 D \0 E
> 0000007
>
> $ dash -c 'echo -n "A\0102C\00D\0E" | hexdump -c'
> 0000000 A B C
> 0000003
>
> and also
>
> $ dash -c 'echo -n "ABC\0DEFGH" | hexdump -c'
> 0000000 A B C
> 0000003
>
> As you see, dash 's builtin echo truncates the output at the first \0
>
> a.
>
> -- System Information:
> Debian Release: testing/unstable
> APT prefers unstable
> APT policy: (500, 'unstable'), (500, 'testing')
> Architecture: i386 (i686)
> Shell: /bin/sh linked to /bin/bash
> Kernel: Linux 2.6.16-1-k7
> Locale: LANG=it_IT.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8)
>
> Versions of packages dash depends on:
> ii libc6 2.3.6-15 GNU C Library: Shared libraries
>
> dash recommends no packages.
>
> -- debconf information:
> * dash/sh: false
>
> --
> Andrea Mennucc
> "E' un mondo difficile. Che vita intensa!" (Tonino Carotone)
This patch fixes handling of embedded NULs using an approach similar
to the one taken by NetBSD. In particular, we first determine the
length of the output string, and then use a sequence of Xs of the
same length as input to the underlying C printf to determine the
amount of leading and trailing padding. Finally we replace the
Xs with the actual string before writing it out.
In order to print out the temporary string containing Xs and padding,
a new helper xasprintf is added. Unlike asprintf though, our
xasprintf prints to the ash stack rather than using straight malloc
memory.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch adds the format string characters a, A and F to the
supported set of the built-in printf command. They're already
supported by the underlying printf function.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The Cygwin platform supports DOS style drive-letter paths such
as "C:\\dir", even though the preferred form is a POSIX-style
"/cygdrive/c/dir". This can be seen by doing things such as
chdir("c:") (which succeeds) followed by getcwd(NULL, 0) (which
returns the normalized "/cygdrive/c"). However, dash was trying
to perform local manipulations on the argument to 'cd' prior to
calling into libc, in order to update the state of $PWD and
friends; these manipulations were assuming that the user meant
to change to a relative subdirectory of the current location,
as in './c:', instead of honoring the drive letter. None of
the other dash builtins take a filename and manipulate it to
affect shell state (some, like 'test', take a file name, but as
stat("c:") works just fine, there is no need to normalize).
This patch has no impact outside of cygwin; on cygwin, it takes
advantage of a native function call to canonicalize any
incoming name into preferred form before updating shell state.
Pre-patch:
$ dash -c 'cd c: && echo $PWD'
dash: 1: cd: can't cd to c:
Post-patch:
$ dash -c 'cd c: && echo $PWD'
/cygdrive/c
Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch makes a small optimisation by using the same value for
quoted between evalvar and varvalue by eliminating nulonly and
passing along quoted instead.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Currently VSLENGTH and VSTRIM* are field-split even within quotes.
This is obviously wrong. This patch fixes that.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Currently we do not field-split $@/$* when it isn't quoted and IFS
is set but empty. This is obviously wrong. This patch fixes this.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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There is no need to setvarint to set the initial value of OPTIND
of one. This patch switchs to setvareq which also lets us avoid
an unnecessary memory allocation.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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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>
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https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=332954
When return is used in a loop conditional the exit status will
be lost because we always set the exit status at the end of the
loop to that of the last command executed in the body.
This is counterintuitive and contrary to what most other shells do.
This patch fixes this by always preserving the exit status of
return when it is used in a loop conditional.
The patch was originally written by Gerrit Pape <pape@smarden.org>.
Reported-by: Stephane Chazelas <stephane_chazelas@yahoo.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The functions evalloop and evalfor share the logic on checking
and updating skipcount. This patch moves that into the helper
function skiploop.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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As it is if you do a multi-level break inside a function it'll
actually include loops outside of the function call. This is
counterintuitive.
This patch changes this by saving and resetting loopnest when
entering a function.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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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>
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All originators of EXERROR have been setting the exitstatus for
a while now. So it is no longer appropriate to set it explicitly
in evalcommand.
In fact doing so may cause the original exitstatus to be lost.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Currently the exit status when we receive SIGINT is set in evalcommand
which means that it doesn't always get set. For example, if you press
CTRL-C at the prompt of an interactive dash, the exit status is not
set to 130 as it is in many other Bourne shells.
This patch fixes this by moving the setting of the exit status into
onint which also simplifies evalcommand.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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As it is if dotrap is called with evalskip set to a nonzero value,
it'll try to execute any set traps. The result is that the first
command in the first set trap will be executed while the rest of
the trap will be silently ignored due to evalskip. This is highly
counterintuitive, even though both bash and ksh exhibit a similar
behaviour.
This patch fixes it by skipping trap processing if evalskip is set
on entry. It also adds a dotrap call to the top of evaltree to
ensure that
while continue; do
continue;
done
has a chance of running traps.
Finally the pendingsigs check is moved into dotrap for compactness.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The function dotrap calls evalstring using the stored trap string.
If evalstring then unsets that exact trap string then we will end
up using freed memory.
This patch fixes it by making evalstring always duplicate the string
before using it.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch adds the nlprompt/nlnoprompt helpers to isolate code
dealing with newlines and prompting.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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On Tue, Aug 26, 2014 at 12:34:42PM +0000, Eric Blake wrote:
> On 08/26/2014 06:15 AM, Oleg Bulatov wrote:
> > Hi!
> >
> > While playing with sh generators I found that dash and bash have different
> > interpretations for <slash><newline> sequence.
> >
> > $ dash -c 'EDIT=xxx; echo $EDIT\
> >> OR'
> > xxxOR
>
> Buggy.
>
> > $ bash -c 'EDIT=xxx; echo $EDIT\
> > OR'
> > /usr/bin/vim
>
> Correct behavior.
>
> >
> > $ dash -c 'echo "$\
> > (pwd)"'
> > $(pwd)
> >
> > Is it undefined behaviour in POSIX?
>
> No, it's well-defined, and dash is buggy. POSIX says:
>
> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_03
>
> "the shell shall break its input into tokens by applying the first
> applicable rule below to the next character in its input"
>
> Rule 4 covers backslash handling, while rule 5 covers locating the end
> of a word to be subject to $ expansion. Therefore, rule 4 should happen
> first. Rule 4 defers to the section on quoting, with the caveat that
> <newline> joining is the only substitution that happens immediately as
> part of the parsing:
>
> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_02
>
> "If a <newline> follows the <backslash>, the shell shall interpret this
> as line continuation. The <backslash> and <newline> shall be removed
> before splitting the input into tokens. Since the escaped <newline> is
> removed entirely from the input and is not replaced by any white space,
> it cannot serve as a token separator."
>
> So the fact that dash is treating the elided backslash-newline as a
> token separator, and parsing your input as if ${EDIT}OR instead of
> ${EDITOR} is a bug in dash.
I agree. This patch should resolve this problem and similar ones
affecting blackslash newlines after we encounter a dollar sign.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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pgetc_macro is identical to pgetc except that it's a macro and
pgetc isn't. Since there is very little performance difference
on modern systems it's time to kill pgetc_macro.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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