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* parser: Fix parsing of ${}Herbert Xu2018-04-19
| | | | | | | | | | | dash -c 'echo ${}' should print "Bad subtitution" but instead fails with "Syntax error: Missing '}'". This is caused by us reading an extra character beyond the right brace. This patch fixes it so that this construct only fails during expansion rather than during parsing. Fixes: 3df3edd13389 ("[PARSER] Report substition errors at...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* man: correct typos, iff -> ifMartijn Dekker2018-04-19
| | | | | | | | | | | | | | | Op 27-03-18 om 20:23 schreef Larry Hynes: > Funny, I did wonder if it might be a contraction, but I did find > it odd that it's not mentioned or explained. I'll leave it be, if > you all are happy enough to keep it 'as is', or can resubmit if you > think it's warranted. I think the simple fact that it came up here is evidence that this is too jargony for a manual. Patch attached. - M. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: Do not quote backslashes in unquoted parameter expansionHerbert Xu2018-04-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Mon, Mar 26, 2018 at 07:25:20PM +0200, Martijn Dekker wrote: > Op 26-03-18 om 17:38 schreef Harald van Dijk: > > And not by dash 0.5.4. Like I wrote, dash 0.5.5 had some bugs that were > > fixed in 0.5.6, which mostly restored the behaviour to match <0.5.5. > > Ah, sorry. dash 0.5.4 and earlier don't compile on my system, so they > are not included in my conveniently accessible arsenal of test shells. > > > As for my patches, that was by accident and doesn't work reliably. When > > the shell sees no metacharacters, pathname expansion is bypassed, and > > backslash isn't considered a metacharacter. Which got me to my original > > example of /de\v: there are no metacharacters in there, so the shell > > doesn't look to see if it matches anything. Which seems highly > > desirable: the shell shouldn't need to hit the file system for words not > > containing metacharacters. The only way then to get consistent behaviour > > is if the backslash is taken as quoted, so I'm not tempted to argue for > > the behaviour you're hoping for, sorry. :) Here is a better example: a="/*/\nullx" b="/*/\null"; printf "%s\n" $a $b dash currently prints /*/\nullx /*/\null bash prints /*/\nullx /dev/null You may argue the bash behaviour is inconsistent but it actually makes sense. What happens is that quote removal only applies to the original token as seen by the shell. It is never applied to the result of parameter expansion. Now you may ask why on earth does the second line say "/dev/null" instead of "/dev/\null". Well that's because it is not the quote removal step that removed the backslash, but the pathname expansion. The fact that the /de\v does not become /dev even though it exists is just the result of the optimisation to avoid unnecessarily calling stat(2). I have checked POSIX and I don't see anything that forbids this behaviour. So going back to dash yes I think we should adopt the bash behaviour for pathname expansion and keep the existing case semantics. This patch does exactly that. Note that this patch does not work unless you have already applied https://patchwork.kernel.org/patch/10306507/ because otherwise the optimisation mentioned above does not get detected correctly and we will end up doing quote removal twice. This patch also updates expmeta to handle naked backslashes at the end of the pattern which is now possible. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* shell: Add subdir-objects to AM_INIT_AUTOMAKEJason Bowen2018-04-19
| | | | | | | | | | | | | | I've attached a patch which adds the subdir-objects option to AM_INIT_AUTOMAKE. For a while now when I've compiled dash I received a warning from automake that there are source files in a subdirectory but that the subdir-objects automake option was not supplied. I've just been adding it myself, but I finally got around to submitting a patch. The code still compiles for now (i'm using automake 1.15.1), but warning text is rarely nice to see and, if the warning text is to be believed, then the warning will eventually become an error. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Restore input files in evalcommandHerbert Xu2018-04-19
| | | | | | | | | When evalcommand invokes a command that modifies parsefile and then bails out without popping the file, we need to ensure the input file is restored so that the shell can continue to execute. Reported-by: Martijn Dekker <martijn@inlv.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Reap zombies after built-in commands and functionsHerbert Xu2018-04-19
| | | | | | | | | | | | | Currently dash does not reap dead children after built-in commands or functions. This means that if you construct a loop consisting of solely built-in commands and functions, then zombies can hang around indefinitely. This patch fixes this by reaping when necessary after each built-in command and function. Reported-by: Denys Vlasenko <vda.linux@googlemail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* redir: Fix typo in noclobber codeHerbert Xu2018-04-19
| | | | | | | | The noclobber code has a typo in it that causes it to fail. This patch fixes it. Reported-by: Denys Vlasenko <vda.linux@googlemail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: Fix glibc glob(3) supportHerbert Xu2018-04-19
| | | | | | | | | | | It's been a while since we disabled glob(3) support by default. It appears to be working now, however, we have to change our code to detect the no-match case correctly. In particular, we need to test for GLOB_NOMAGIC | GLOB_NOCHECK instead of GLOB_MAGCHAR. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: Fix buffer overflow in expandmetaHerbert Xu2018-04-02
| | | | | | | | | | | | The native version of expandmeta allocates a buffer that may be overrun for two reasons. First of all the size is 1 byte too small but this is normally hidden because the minimum size is rounded up to 2048 bytes. Secondly, if the directory level is deep enough, any buffer can be overrun. This patch fixes both problems by calling realloc when necessary. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* builtin: Move echo space/nl handling into print_escape_strHerbert Xu2018-04-02
| | | | | | | | | Currently echocmd uses print_escape_str to do everything apart from printing the spaces/newlines separating its arguments. This patch moves the actual printing into print_escape_str as well using the format parameter. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* builtin: Fix echo performance regressionHerbert Xu2018-04-02
| | | | | | | | | | | | | | | | | | The commit d6c0e1e2ffbf7913ab69d51cc794d48d41c8fcb1 ("[BUILTIN] Handle embedded NULs correctly in printf") caused a performance regression in the echo built-in because every echo call now goes through the printf %b slow path where the string is always printed twice to ensure the space padding is correct in the presence of NUL characters. In fact this regression applies to printf %b as well. This is easily fixed by making printf %b take the fast path when no precision/field width modifiers are present. This patch also changes the second strchurnul call to strspn which generates slightly better code. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: Fix ghost fields with unquoted $@/$*Herbert Xu2018-04-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Harald van Dijk <harald@gigawatt.nl> wrote: > On 22/03/2018 22:38, Martijn Dekker wrote: >> Op 22-03-18 om 20:28 schreef Harald van Dijk: >>> On 22/03/2018 03:40, Martijn Dekker wrote: >>>> This patch fixes the bug that, given no positional parameters, unquoted >>>> $@ and $* incorrectly generate one empty field (they should generate no >>>> fields). Apparently that was a side effect of the above. >>> >>> This seems weird though. If you want to remove the recording of empty >>> regions because they are pointless, then how does removing them fix a >>> bug? Doesn't this show that empty regions do have an effect? Perhaps >>> they're not supposed to have any effect, perhaps it's a specific >>> combination of empty regions and something else that triggers some bug, >>> and perhaps that combination can no longer occur with your patch. >> >> The latter is my guess, but I haven't had time to investigate it. > > Looking into it again: > > When IFS is set to an empty string, sepc is set to '\0' in varvalue(). > This then causes *quotedp to be set to true, meaning evalvar()'s quoted > variable is turned on. quoted is then passed to recordregion() as the > nulonly parameter. > > ifsp->nulonly has a bigger effect than merely selecting whether to use > $IFS or whether to only split on null bytes: in ifsbreakup(), nulonly > also causes string termination to be suppressed. That's correct: that > special treatment is required to preserve empty fields in "$@" > expansion. But it should *only* be used when $@ is quoted: ifsbreakup() > takes nulonly from the last IFS region, even if it's empty, so having an > additional zero-length region with nulonly enabled causes confusion. > > Passing quoted by value to varvalue() and not attempting to modify it > should therefore, and in my quick testing does, also work to fix the > original $@ bug. You're right. The proper fix to this is to ensure that nulonly is not set in varvalue for $*. It should only be set for $@ when it's inside double quotes. In fact there is another bug while we're playing with $@/$*. When IFS is set to a non-whitespace character such as :, $* outside quotes won't remove empty fields as it should. This patch fixes both problems. Reported-by: Martijn Dekker <martijn@inlv.org> Suggested-by: Harald van Dijk <harald@gigawatt.nl> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Allow newlines within parameter substitutionHerbert Xu2018-04-02
| | | | | | | | | | | | | | | | | | | | | | | | On Fri, Mar 16, 2018 at 11:27:22AM +0800, Herbert Xu wrote: > On Thu, Mar 15, 2018 at 10:49:15PM +0100, Harald van Dijk wrote: > > > > Okay, it can be trivially modified to something that does work in other > > shells (even if it were actually executed), but gets rejected at parse time > > by dash: > > > > if false; then > > : ${$+ > > } > > fi > > That's just a bug in dash's parser with ${} in general, because > it bombs out without the if clause too: > > : ${$+ > } This patch fixes the parsing of newlines with parameter substitution. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: Fix bugs with words connected to the right of $@Herbert Xu2018-04-02
| | | | | | | | | | | | | | | | | | | On Sun, Mar 04, 2018 at 12:44:59PM +0100, Harald van Dijk wrote: > > command: set -- a ""; space=" "; printf "<%s>" "$@"$space > bash: <a><> > dash 0.5.8: <a>< > > dash 0.5.9.1: <a>< > > dash patched: <a><> This is actually composed of two bugs. First of all our tracking of quotemark is wrong so anything after "$@" becomes quoted. Once we fix that then the problem is that the first space character after "$@" is not recognised as an IFS. This patch fixes both. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* Revert "[BUILTIN] Remove unnecessary restoration of format string in printf"Herbert Xu2018-03-25
| | | | | | | | This reverts commit 7bb413255368e94395237d789f522891093c5774. The commit breaks printf with more than argument. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Fix backquote support in here-document EOF markHerbert Xu2018-03-22
| | | | | | | | | | Currently using backquotes in a here-document EOF mark is broken because dash tries to do command substitution on it. This patch fixes it by checking whether we're looking for an EOF mark during tokenisation. Reported-by: Harald van Dijk <harald@gigawatt.nl> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* shell: provide .gitignoreMartijn Dekker2018-03-22
| | | | | | | | Here's a .gitignore file for the convenience of casual git users. - M. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Fix single-quoted patterns in here-documentsHerbert Xu2018-03-22
| | | | | | | | | | | | | | | | The script x=* cat <<- EOF ${x#'*'} EOF prints * instead of nothing as it should. The problem is that when we're in sqsyntax context in a here-document, we won't add CTLESC as we should. This patch fixes it: Reported-by: Harald van Dijk <harald@gigawatt.nl> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Add syntax stack for recursive parsingHerbert Xu2018-03-22
| | | | | | | | | | | | | | | | | | | | | | | | | | Without a stack of syntaxes we cannot correctly these two cases together: "${a#'$$'}" "${a#"${b-'$$'}"}" A recursive parser also helps in some other corner cases such as nested arithmetic expansion with paratheses. This patch adds a syntax stack allocated from the stack using alloca. As a side-effect this allows us to remove the naked backslashes for patterns within double-quotes, which means that EXP_QPAT also has to go. This patch also fixes removes any backslashes that precede right braces when they are present within a parameter expansion context, and backslashes that precede double quotes within inner double quotes inside a parameter expansion in a here-document context. The idea of a recursive parser is based on a patch by Harald van Dijk. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: use pgetc_eatbnl() in more placesHarald van Dijk2018-03-22
| | | | | | | | | | dash has a pgetc_eatbnl function in parser.c which skips any backslash-newline combinations. It's not used everywhere it could be. There is also some duplicated backslash-newline handling elsewhere in parser.c. Replace most of the calls to pgetc() with calls to pgetc_eatbnl() and remove the duplicated backslash-newline handling. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* builtin: Greater resolution in test -nt / test -otMartijn Dekker2018-03-22
| | | | | | | | | | | | | | | | | | | | | | | Op 07-03-18 om 15:46 schreef Martijn Dekker: > Op 06-03-18 om 09:19 schreef Herbert Xu: >> On Thu, Jun 22, 2017 at 10:30:02AM +0200, Petr Skočík wrote: >>> would you be willing to pull something like this? > [...] >>> I could use greater resolution in `test -nt` / `test -ot`, and st_mtim >>> field is standardized under POSIX.1-2008 (or so stat(2) says). >> >> Sure. But your patch is corrupted. > > Fixed patch attached. > > But I wouldn't apply it as is. My system does not have st_mtim. So I > think it needs a configure test and a fallback to the old method. Here's an attempt to make that happen. See attached. - M. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* mystring: fix "Illegal number" on FreeBSD & macOS for x=; echo $((x))Martijn Dekker2018-03-10
| | | | | | | | | | | | | | | | | | | | | Op 07-03-18 om 06:26 schreef Herbert Xu: > Martijn Dekker <martijn@inlv.org> wrote: >> >>> Since base is always a constant 0 or a constant 10, never a >>> user-provided value, the only error that strtoimax will ever report on >>> glibc systems is ERANGE. Checking only ERANGE therefore preserves the >>> glibc behaviour, and allows the exact same set of errors to be detected >>> on non-glibc systems. >> >> That makes sense, thanks. > > Could you resend your patch with this change please? OK, see below. - M. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: 'nolog' and 'debug' options cause "$-" to wreak havocMartijn Dekker2018-03-10
| | | | | | | | | | | | | | | | | | | | | | | | Op 29-03-17 om 20:02 schreef Martijn Dekker: > Bug: if either the 'nolog' or the 'debug' option is set, trying to > expand "$-" silently aborts parsing of an entire argument. > > $ dash -o nolog -c 'set -fuC; echo "|$- are the options|"; \ > set +o nolog; echo "|$- are the options|"' > | > |uCf are the options| > $ dash -o debug -c 'set -fuC; echo "|$- are the options|"; \ > set +o debug; echo "|$- are the options|"' > | > |uCf are the options| This turned out to be easy to fix. The routine producing the "$-" expansion failed to skip options for which there is no option letter, but only a long-form name. In dash, 'nolog' and 'debug' are currently the only two such options. Patch below. - Martijn Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* histedit: fix build with musl libcBaruch Siach2018-03-10
| | | | | | | | | | | | | musl libc defines the optreset BSD extension only in getopt.h. This fixes the following build failure: histedit.c: In function 'histcmd': histedit.c:220:2: error: 'optreset' undeclared (first use in this function) optreset = 1; optind = 1; /* initialize getopt */ ^~~~~~~~ Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: Remove dependency on fmatch.h if it does not exitRink Springer2018-03-10
| | | | | | | | | | | | | | | | | | | | | [ Ugh; forgot to attach patch - apologies, I need more coffee ] Dear all, Attached is a trivial patch that removes the assumption that fnmatch.h is available - the configure script already checks for fnmatch(3) and supplies its own implementation if necessary, but fnmatch.h is always included. Let me know what you think. Regards, Rink Do not assume we can include fnmatch.h Signed-off-by: Rink Springer <rink@rink.nu> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* input: Fix here-document redirection with vi/emacs onHarald van Dijk2018-03-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | On 27/06/17 16:29, Zando Fardones wrote: > Hello, > > I think I've found a bug when using the here-document redirection in > an interactive shell. What basically happens is that you can't see the > command output if you set the "vi" or "emacs" options. That's not quite what happens: the here-document contents got lost, so there is no command output to see. Nice find. The problem is that getprompt() is implicitly called by el_gets(). This messes with the memory used by the parser to store the here-document's contents. In the non-emacs/vi case, the prompt is explicitly written by setprompt(), which wraps the getprompt() call in a pushstackmark()/popstackmark() pair to restore the state so that parsing can continue. But when getprompt() is called by el_gets(), it knows nothing about this. The whole call to el_gets() can be surrounded by another pushstackmark()/popstackmark() pair to solve the problem, as attached. Cheers, Harald van Dijk Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* man: Small cleanup for Command Line EditingLarry Hynes2018-03-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Jilles Tjoelker <jilles@stack.nl> wrote: > On Sat, Jun 17, 2017 at 03:53:26PM +0100, Larry Hynes wrote: >> src/dash.1, under Command Line Editing, states: >> It's similar to vi: typing <ESC> will throw you into command >> VI command mode. >> - There appears to be no need for both occurrences of 'command' >> - I can't see a reason for VI to be capitalised >> - 'will throw you into' seems a little... enthusiastic >> Following diff changes it to >> It's similar to vi: typing <ESC> enters vi command mode. >> diff --git a/src/dash.1 b/src/dash.1 >> index 8b8026d..f35d89d 100644 >> --- a/src/dash.1 >> +++ b/src/dash.1 >> @@ -2232,7 +2232,7 @@ enabled, sh can be switched between insert mode and command mode. >> The editor is not described in full here, but will be in a later document. >> It's similar to vi: typing >> .Aq ESC >> -will throw you into command VI command mode. >> +enters vi command mode. >> Hitting >> .Aq return >> while in command mode will pass the line to the shell. > I agree. If you're changing things here anyway, I suggest getting rid of > the contraction as well (changing It's to It is). The fairly formal > style of man pages avoids contractions, just like it avoids "you". > The reference to the "later document" can probably be removed as well, > since said document does not exist yet after many years. Hi Revised diff, below, expands the contraction, deletes reference to 'later document' and changes 'place' to 'places' in the following: The command ‘set -o vi’ enables vi-mode editing and place sh into vi insert mode. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* builtin: describe_command - fix incorrect pathHarald van Dijk2018-03-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Hi, On 26/05/17 09:04, Youfu Zhang wrote: > $ PATH=/extra/path:/usr/sbin:/usr/bin:/sbin:/bin \ >> sh -xc 'command -V ls; command -V ls; command -Vp ls; command -vp ls' > + command -V ls > ls is /bin/ls > + command -V ls > ls is a tracked alias for /bin/ls > + command -Vp ls > ls is a tracked alias for (null) > + command -vp ls > Segmentation fault (core dumped) > > describe_command should respect `path' argument. Looking up in the hash table > may gives incorrect index in entry.u.index and finally causes incorrect output > or SIGSEGV. True, but only when a path is passed in. If the default path is used, looking up in the hash table is correct, and printing tracked aliases is intentional. If it's desirable to drop that feature, then it should be dropped completely, code shouldn't be left in that can no longer be used. But it's possible to keep it working: how about this instead? Signed-off-by: Harald van Dijk <harald@gigawatt.nl> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* trap: Globally rename pendingsigs to pending_sigDenys Vlasenko2018-03-10
| | | | | | | | | | | | This variable does not contain "sigs" (plural). It contains either 0 or (one) signal number of a pending signal. For someone unfamiliar with this code, "pendingsigs" name is confusing - it hints at being an array or bit mask of pending singnals. Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> CC: dash@vger.kernel.org Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* Release 0.5.9.1.Herbert Xu2016-09-23
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* expand - Fix dangling left square brackets in patternsHerbert Xu2016-09-23
| | | | | | | | | | When there is an unmatched left square bracket in patterns, pmatch will behave strangely and exhibit undefined behaviour. This patch (based on Harld van Dijk's original) fixes this by treating it as a literal left square bracket. Reported-by: Olof Johansson <olof@ethup.se> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* builtin: Fix echo -n early terminationHerbert Xu2016-09-02
| | | | | | | | | | | | | The commit 7a784244625d5489c0fc779201c349555dc5f8bc ("[BUILTIN] Simplify echo command") broke echo -n by making it always terminate after printing the first argument. This patch fixes this by only terminating when we have reached the end of the arguments. Fixes: 7a784244625d ("[BUILTIN] Simplify echo command") Reported-by: Luigi Tarenga <luigi.tarenga@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* builtin: Fix handling of trailing IFS white spacesHerbert Xu2016-09-02
| | | | | | | | | | | | | | | The read built-in does not handle trailing IFS white spaces in the right way, when there are more fields than variables. Part of the problem is that this case is handled outside of ifsbreakup. Harald van Dijk wrote a patch to fix this by moving the magic into ifsbreakup itself. This patch further reorganises the ifsbreakup loop by having only one loop over the whole string. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Tested-by: Harald van Dijk <harald@gigawatt.nl>
* 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>
* jobs: Handle string-based job descriptorsStephen Kitt2016-09-02
| | | | | | | | | | | | | | When looking for a job using a string descriptor, e.g. fg %man the relevant loop in src/jobs.c only ever exits to the err label. With this patch, when the end condition is reached, we check whether a job was found, and if so, set things up to exit correctly via gotit. Multiple matches are already caught using the test in the match block. Signed-off-by: Stephen Kitt <steve@sk2.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* trap: Implement POSIX.1-2008 trap reset behaviourHerbert Xu2016-09-02
| | | | | | | | | | | Jonathan Perkin submitted a patch to fix the behaviour of trap when the first argument is an integer. Currently it is treated as a command while POSIX requires it to be treated as a signal. This patch is based on his idea but instead of adding an extra argument to decode_signal I have added a new decode_signum helper. 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>
* man: Document ulimit -vGioele Barabucci2016-06-06
| | | | | | | | | | 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>
* shell: Fix build on Solaris 9Jonathan Perkin2016-06-06
| | | | | | | | | | | | | 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>
* jobs: Don't attempt to access job table for job %0Tobias Klauser2016-06-06
| | | | | | | | | | | | | 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>
* builtin: Reject malformed printf specifications with digits after '*'Patrick Brown2016-06-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* Release 0.5.9.Herbert Xu2016-06-06
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* builtin: Reset t_wp_op in testcmdHerbert Xu2015-08-13
| | | | | | | | 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>
* man: Fix description of getopts when last argument reachedFelix Dietrich2015-06-11
| | | | | | | | 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>
* builtin: Clear LC_ALL in mkbuiltinsFredrik Fornwall2015-06-11
| | | | | | | | | | | | | | | | 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>
* input: Allow two consecutive calls to pungetcHerbert Xu2015-01-05
| | | | | | | | | | | | | | | 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>
* input: Move all input state into parsefileHerbert Xu2015-01-05
| | | | | | | | 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>
* 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>
* input: Make preadbuffer staticHerbert Xu2015-01-05
| | | | | | | The function preadbuffer should be static as it's only used in input.c. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: Fixed "$@" expansion when EXP_FULL is falseHerbert Xu2015-01-05
| | | | | | | | | | | | 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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