Commit Graph

681 Commits

Author SHA1 Message Date
Denys Vlasenko
7d4aec0c3e ash: split bash compatible extensions into separate defines. No code changes
Splitting these options makes it self-documenting about what
bash-compatible features we have.

Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-11 14:00:38 +01:00
Denys Vlasenko
2b4c258e74 ash: revert "make dot command search current directory first"
Reverts this:
    commit 8ad78e1ec7
    Author: Denis Vlasenko <vda.linux@googlemail.com>
    Date:   Sun Feb 15 12:40:30 2009 +0000
    ash: make dot command search current directory first, as bash does.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-10 15:18:38 +01:00
Denys Vlasenko
265062d59d shells: make hush test optional, rename ASH_BUILTIN_foo -> ASH_foo
This makes hash and ash more symmetrical wrt config menu and config
options.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-10 15:13:30 +01:00
Denys Vlasenko
f560422fa0 Big cleanup in config help and description
Redundant help texts (one which only repeats the description)
are deleted.

Descriptions and help texts are trimmed.

Some config options are moved, even across menus.

No config option _names_ are changed.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-10 14:58:54 +01:00
Denys Vlasenko
fb87d93d1e ash: fix a bug in argv restoration after sourcing a file
if sourced file "shift"ed argvs so that $1 is NULL, restore wasn't done.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-09 08:22:06 +01:00
Denys Vlasenko
86584e134e ash: fix open fds leaking in redirects. Closes 9561
commit e19923f665 deleted clearredir()
call in shellexec():

	ash: [REDIR] Remove redundant CLOEXEC calls
	Upstream commit:

	Now that we're marking file descriptors as CLOEXEC in savefd, we no longer
	need to close them on exec or in setinputfd.

but it missed one place where we don't set CLOEXEC. Fixing this.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-07 10:16:56 +01:00
Kang-Che Sung
6cd0294725 ash: explicltly group ash options
This would makes all ash options indented inside "ash" in menuconfig.
It appears that menuconfig has a limit at tracking multiple dependency
lines like this (it looks like a "diamond problem" but I'm not sure if
it is):

               ---ASH <----------
              /                  \       ASH_OPTIMIZE_FOR_SIZE
    !NOMMU <-*----SH_IS_ASH <----[OR] <--ASH_INTERNAL_GLOB
              \                  /       ASH_RANDOM_SUPPORT
               ---BASH_IS_ASH <--        [...]

The kconfig-language document [1] states that:

> If a menu entry somehow depends on the previous entry, it can be
> made a submenu of it. First, the previous (parent) symbol must be
> part of the dependency list and then one of these two conditions
> must be true:
> - the child entry must become invisible, if the parent is set to 'n'

    [BusyBox ash used to satisfy this, but no longer does]

> - the child entry must only be visible, if the parent is visible

    [BusyBox ash configs actually satisfy this, but because of
     "diamond" above this might not be easily detected]

So I found out a direct workaround: by making ash options explicitly
depend on !NOMMU, we can tell menuconfig that rule 2 above is satisfied
without any more tracking.

               ---------------------
              /                     \
    !NOMMU <-*-----ASH <--------     \
              \                 \     \        ASH_OPTIMIZE_FOR_SIZE
               *---SH_IS_ASH <---[OR]-[AND] <--ASH_INTERNAL_GLOB
                \                /             ASH_RANDOM_SUPPORT
                 --BASH_IS_ASH <-              [...]

So all ash options would now be indented under "ash".

[1] "Documentation/kbuild/kconfig-language.txt" in Linux kernel source

Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-06 17:03:18 +01:00
Ron Yorston
ea7d2f6ec0 ash: fix error code regression
The commit 'ash,hush: set exit code 127 in "sh /does/not/exist" case'
only partly implemented the dash commit '[ERROR] Allow the originator
of EXERROR to set the exit status'.  This resulted in incorrect error
codes for a syntax error:

   $ )
   $ echo $?
   0

or a redirection error for a special builtin:

   $ rm -f xxx
   $ eval cat <xxx
   $ echo $?
   0

Signed-off-by: Ron Yorston <rmy@pobox.com>
Reported-by: Martijn Dekker <martijn@inlv.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-03 11:18:23 +01:00
Denys Vlasenko
0b8835861b Make it possible to select "sh" and "bash" aliases without selecting ash or hush
The same can be done for msh, but we are probably better off just deleting it
in a next versio or two.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-12-23 16:56:43 +01:00
Denys Vlasenko
6704746c69 shell: move "config" blocks above their use in coditional includes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-12-22 15:21:58 +01:00
Denys Vlasenko
326edc3e37 Tweak some config defaults; fix MODPROBE_SMALL ordering in "make config"
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-12-22 14:36:49 +01:00
Denys Vlasenko
2166952ec3 ash: clarify uclibc glob() bug in comment
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-12-21 21:04:16 +01:00
Denys Vlasenko
3a4cdf45f9 ash: error out if ASH_INTERNAL_GLOB is not selected on uClibc
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-12-21 04:13:23 +01:00
Denys Vlasenko
2fe66b1d2d ash: fix signed char expansion bug
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-12-12 17:39:12 +01:00
Denys Vlasenko
b6afcc7819 shell: suppress "unused var/func" warnings on some configs
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-12-12 16:30:20 +01:00
Denys Vlasenko
4b89d512b1 ash,hush: make ^C in interactive mode visually much closer to bash behavior
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-11-25 03:41:03 +01:00
Denys Vlasenko
8660aeb312 ash,hush: ^C from command line should set $? to 128+SIGINT
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-11-24 17:44:02 +01:00
Denys Vlasenko
15fb91cefb test: make [ and [[ forms individually selectable
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-11-23 18:31:48 +01:00
Denys Vlasenko
06b114900f ash: fix "duplicate local" code (forgot to re-enable interrupts)
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-11-04 16:43:18 +01:00
Denys Vlasenko
1ab7c2fc6d ash: while (!got_sig) pause() is not reliable, use sigsuspend()
dash was doing it for a reason. Unfortunately, it had no comment why...
now I know.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-11-03 20:22:54 +01:00
Denys Vlasenko
d4f3db9427 ash: if using libc glob(), skip it if no metachars are in word
This saves making tons of pointless stat() calls

function                                             old     new   delta
expandarg                                            888     921     +33

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-30 18:41:01 +01:00
Denys Vlasenko
474ed06c39 ash: fix bit-rotten debug infrastructure
DEBUG = 2 output was a bit messed up

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-30 18:30:29 +01:00
Denys Vlasenko
493b9cae80 ash: make popfile() anfter popallfiles() safe
In this example:

	ash -c 'readonly x; echo $(command eval x=2)'

evalstring() is called after forkchild(), which calls popallfiles().
On exception, evalstring() will popfile().

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-30 18:27:14 +01:00
Denys Vlasenko
8f7b0248ad ash: use pause(), not sigsuspend(), in wait builtin
Same effect, smaller code

function                                             old     new   delta
dowait                                               463     374     -89

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-28 17:16:11 +02:00
Denys Vlasenko
d81e9f5093 ash: fix interactive "command eval STRING" exiting on errors.
This bug is also present in current dash

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-28 15:43:50 +02:00
Denys Vlasenko
458c1f218b ash: [JOBS] Fix dowait signal race
Upstream commit:

    Date: Sun, 22 Feb 2009 18:10:01 +0800
    [JOBS] Fix dowait signal race

    This test program by Alexey Gladkov can cause dash to enter an
    infinite loop in waitcmd.

    #!/bin/dash
    trap "echo TRAP" USR1
    stub() {
        echo ">>> STUB $1" >&2
        sleep $1
        echo "<<< STUB $1" >&2
        kill -USR1 $$
    }
    stub 3 &
    stub 2 &
    until { echo "###"; wait; } do
    echo "*** $?"
    done

    The problem is that if we get a signal after the wait3 system
    call has returned but before we get to INTON in dowait, then
    we can jump back up to the top and lose the exit status.  So
    if we then wait for the job that has just exited, then it'll
    stay there forever.

    I made the original change that caused this bug to fix pretty
    much the same bug but in the opposite direction.  That is, if
    we get a signal after we enter wait3 but before we hit the kernel
    then it too can cause the wait to go on forever (assuming the
    child doesn't exit).

    In fact this is pretty much exactly the scenario that you'll
    find in glibc's documentation on pause().  The solution is given
    there too, in the form of sigsuspend, which is the only way to
    do the check and wait atomically.

    So this patch fixes Alexey's race without reintroducing the old
    bug by converting the blocking wait3 to a sigsuspend.

    In order to do this we need to set a signal handler for SIGCHLD,
    so the code has been modified to always do that.

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

I failed to reproduce the bug (it requires precise timing), but it seems real.

function                                             old     new   delta
dowait                                               284     463    +179
setsignal                                            301     326     +25
signal_handler                                        59      76     +17
ash_main                                            1481    1487      +6
localcmd                                             350     348      -2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/1 up/down: 227/-2)            Total: 225 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-27 23:51:19 +02:00
Denys Vlasenko
c0663c7cd2 ash: [SIGNAL] Remove EXSIG
Upstream commit 1:

    Date: Sun, 22 Feb 2009 18:16:13 +0800
    [SIGNAL] Remove EXSIG

    Now that waitcmd no longer uses EXSIG we can remove it.

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Upstream commit 2:

    Date: Thu, 2 Oct 2014 21:07:55 +0800
    [ERROR] Set exitstatus in onint

    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>

Upstream commit 3:

    Date: Fri, 3 Oct 2014 14:07:07 +0800
    [EVAL] Do not clobber exitstatus in evalcommand

    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>

Last three coomits:
function                                             old     new   delta
waitcmd                                              186     224     +38
dowait                                               276     284      +8
waitforjob                                           104     107      +3
localcmd                                             348     350      +2
showjobs                                              64      61      -3
forkshell                                            263     260      -3
raise_interrupt                                       93      67     -26
blocking_wait_with_raise_on_sig                       40       -     -40
evalcommand                                         1264    1208     -56
evaltree                                             809     498    -311

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-27 21:13:49 +02:00
Denys Vlasenko
6918811014 ash: open-code blocking_dowait_with_raise_on_sig()
There is in fact only one callsite.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-27 21:13:24 +02:00
Denys Vlasenko
b543bdadb3 ash: return to DOWAIT_* constants similar to dash, no logic changes
This loses an insignificant optimization, but may allow backporting
of some recent-ish dash fixes.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-27 21:13:24 +02:00
Denys Vlasenko
3f44a6be58 ash: delete leftovers from "simplify EOF/newline handling in list parser" commit
This commit should have deleted these two statements:

    commit c0e007663d
    Author: Ron Yorston <rmy@pobox.com>
    Date:   Thu Oct 29 11:30:55 2015 +0000
    ash: simplify EOF/newline handling in list parser

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-27 14:49:21 +02:00
Denys Vlasenko
5ac04f2f02 ash: [EXPAND] Fix ifsfirst/ifslastp leak
Upstream commit:

    Date: Wed, 8 Sep 2010 20:07:26 +0800
    [EXPAND] Fix ifsfirst/ifslastp leak

    As it stands expandarg may return with a non-NULL ifslastp which
    then confuses any subsequent ifsbreakup user that doesn't clear
    it directly.

    What's worse, if we get interrupted before we hit ifsfree in
    expandarg we will leak memory.

    This patch fixes this by always calling ifsfree in expandarg
    thus ensuring that ifslastp is always NULL on the normal path.
    It also adds an ifsfree call to the RESET path to ensure that
    memory isn't leaked.

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Fallout 1:

    Date: Mon, 18 Oct 2010 10:55:42 +0800
    [EXPAND] Fix ifsfirst/ifslastp leak in casematch

    The commit f42e443bb511ed3224f09b4fcf0772438ebdbbfa

        [EXPAND] Fix ifsfirst/ifslastp leak

    revealed yet another ifsfirst/ifslastp leak in casematch.
    Previously it was hidden because ifsfirst/ifslastp was cleared
    unconditionally on entry (which caused the leakage of those
    entries).

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Fallout 2:

    Date: Sun, 28 Nov 2010 21:09:51 +0800
    [EXPAND] Free IFS state in evalbackcmd

    On Sun, Nov 07, 2010 at 04:04:20PM -0600, Jonathan Nieder wrote:
    > Herbert Xu wrote:
    > > commit f42e443bb511ed3224f09b4fcf0772438ebdbbfa
    > > Author: Herbert Xu <herbert@gondor.apana.org.au>
    > > Date:   Wed Sep 8 20:07:26 2010 +0800
    > >
    > >     [EXPAND] Fix ifsfirst/ifslastp leak
    >
    > Another puzzle bisecting to f42e443bb.  This one comes from the
    > grub-mkconfig script:
    >
    >  $ sh -c 'datadir=/usr/share; pkgdatadir=${datadir}/`cat`' 2>&1 | cat -A
    >  cat: M-^\^M^F^HM-4^M^F^HM-(^M^F^H: No such file or directory$
    >  cat: M-(^M^F^H: No such file or directory$
    >
    > Still reproducible with 016b529.  I'll try to find time to look into
    > it, but thought you might like to know nevertheless.

    This is the symptom of another leak.  In this case evalbackcmd
    occurs in the middle of an expansion (as it should) but the forked
    child never clears the previous IFS state.

    This patch adds the missing ifsfree call.

    This wasn't as much of a problem as the previously discovered leaks
    since all it means is that the child gets to carry around the parent's
    expansion state and the child is usually short-lived.

    Reported-by: Jonathan Nieder <jrnieder@gmail.com>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Fallout 3:

    Date: Tue, 15 Mar 2011 16:01:34 +0800
    [EXPAND] Free IFS state after here document expansion

    Here's another bug bisecting to f42e443bb ([EXPAND] Fix
    ifsfirst/ifslastp leak, 2010-09-08).  It was found with the following
    test case, based on the configure script for Tracker:

        dash -x -c '
                <<-_ACEOF
                $@
                _ACEOF
                exec
        ' - abcdefgh
        +
        + exec   ?a
        exec: 1: : Permission denied

    The missing ifsfree call is in expandarg when it returns to openhere
    during here document expansion.

    Reported-by: Aurelien Jarno <aurel32@debian.org>
    Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

function                                             old     new   delta
ifsfree                                                -      66     +66
ash_main                                            1490    1495      +5
argstr                                              1154    1159      +5
evalcase                                             275     270      -5
expandarg                                            972     888     -84
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 2/2 up/down: 76/-89)            Total: -13 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-27 14:46:50 +02:00
Denys Vlasenko
455e422814 ash: move ifsbreakup() and ifsfree() up
Preparatory patch.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-27 14:46:17 +02:00
Denys Vlasenko
b4f51d32d2 ash: partially sync with dash on "fork if traps are set" logic
Upstream commit "[EVAL] Force fork if any trap is set, not just on EXIT"
had a similar code as our fix to that bug.
Eliminate some superficial differences.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-27 12:55:09 +02:00
Denys Vlasenko
2eb0a7e1b9 ash: [SHELL] Expand ENV before using it
Upstream commit:

    Date: Sun, 13 Jul 2008 21:51:52 +0800
    [SHELL] Expand ENV before using it

    Per POSIX ENV needs to undergo parameter expansion.

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-27 11:28:59 +02:00
Denys Vlasenko
70392331a9 ash: comment tweaks, no code changes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-27 02:31:55 +02:00
Denys Vlasenko
65a8b859a9 ash: optimize tryexec(): avoid one allocation
There was a bug in tryexec which bbox had fixed in 2003.
dash had a smaller fix in 2007. Copy it. It is smaller,
although it is also more quirky (requires argv[-1] to exist).

Upstream commit 1:

    Date: Mon, 15 Oct 2007 20:24:28 +0800
    [EXEC] Fixed execing of scripts with no hash-bang

    The function tryexec used the original name instead of the path found through
    PATH search.  This patch fixes that.

    Test case:

        trap 'rm -f $TMP' EXIT
        TMP=$(tempfile -s nosuchthing)

        cat <<- EOF > $TMP
                echo OK
        EOF
        chmod u+x $TMP

        cd /
        PATH=${TMP%/*} ${TMP##*/}

    Old result:

        /bin/sh: Can't open filelgY4Fanosuchthing

    New result:

        OK

Upstream commit 2:

    Date: Sun, 23 Dec 2007 11:02:26 +0800
    [EVAL] Fix bad pointer arithmetic in evalcommand

    dash dies on sparc with a SIGBUS due to an arithmetic error introduced
    with commit 03b4958, this patch fixes it.

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

function                                             old     new   delta
evalcommand                                         1261    1264      +3
dotcmd                                               321     319      -2
tryexec                                              115      64     -51
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/2 up/down: 3/-53)             Total: -50 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-26 22:29:11 +02:00
Denys Vlasenko
0e081d01a8 ash: [CD] Lookup PWD after going through CDPATH
Upstream commit:

    Date: Mon, 31 Aug 2009 22:06:41 +1000
    [CD] Lookup PWD after going through CDPATH

    On Tue, Jul 14, 2009 at 09:39:03PM +0000, Eric Blake wrote:
    > For the cd command, POSIX 2008 requires that after all pathnames in CDPATH
    > have been tested and failed in step 5, then step 6 interprets the directory
    > argument relative to PWD.  In other words, this demonstrates a bug:
    >
    > $ dash -c 'cd /tmp; mkdir -p foo; CDPATH=oops; cd foo; echo $?; pwd'
    > cd: 1: can't cd to foo
    > 2
    > /tmp
    >
    > while bash gets it correct:
    >
    > $ bash -c 'cd /tmp; mkdir -p foo; CDPATH=oops; cd foo; echo $?; pwd'
    > 0
    > /tmp/foo

    This patch fixes the problem.

    Reported-by: Eric Blake <ebb9@byu.net>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

function                                             old     new   delta
cdcmd                                                667     680     +13

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-26 19:56:05 +02:00
Denys Vlasenko
a318bba199 ash: [MEMALLOC] Made grabstackblock an inline wrapper for stalloc
Upstream patch:

    Date: Fri, 5 Oct 2007 23:26:45 +0800
    [MEMALLOC] Made grabstackblock an inline wrapper for stalloc

    The function grabstackblock is identical in semantics to stalloc within its
    input constraints.

function                                             old     new   delta
dotcmd                                               319     321      +2
grabstackblock                                        19       5     -14

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-26 18:26:27 +02:00
Denys Vlasenko
dbef38a74b ash: [VAR] Remove setvarsafe
Upstream commit:

    Date: Sat, 6 Oct 2007 21:18:58 +0800
    [VAR] Remove setvarsafe

    The only user of setvarsafe is getopts.  However, we can achieve the same
    result by pre-setting the value of shellparam.optind.

function                                             old     new   delta
getoptscmd                                           614     515     -99
setvarsafe                                           147       -    -147
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 0/1 up/down: 0/-246)           Total: -246 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-26 17:54:32 +02:00
Denys Vlasenko
35c2a136cd ash: use shellparam.optind/optoff in getopts() directly, not through pointers
This is a preparatory patch for next change

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-26 17:34:26 +02:00
Denys Vlasenko
3df1410a00 ash: [PARSER] Size optimisations in parameter expansion parser
Upstream commit:

    Date: Thu, 4 Oct 2007 22:20:38 +0800
    [PARSER] Size optimisations in parameter expansion parser

    Merge flags into subtype.
    Do not write subtype out twice.
    Add likely flag on ${ vs. $NAME.
    Kill unnecessary (and bogus) PEOA check.

function                                             old     new   delta
readtoken1                                          2891    2860     -31

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-26 16:41:13 +02:00
Denys Vlasenko
350e686f3b ash: [PARSER] Recognise here-doc delimiters terminated by EOF
Upstream commit 1:

    Date: Wed, 26 Sep 2007 17:14:16 +0800
    [PARSER] Recognise here-doc delimiters terminated by EOF

    Previously dash required a <newline> character to be present in order for
    a here-document delimiter to be detected.  Allowing EOF in the absence of
    a <newline> to play the same purpose allows some intuitive scripts to
    succeed.  POSIX seems to be silence on this so this should be OK.

    Test case:

        eval 'cat <<- NOT
                test
        NOT'
        echo OK

    Old result:

        test
        NOTOK

    New result:

        test
        OK

Upstream commit 2:

    Date: Sat, 20 Oct 2007 18:49:31 +0800
    [PARSER] Fix here-doc corruption

    The change

        [PARSER] Recognise here-doc delimiters terminated by EOF

    introduced a regerssion whereby lines starting with eofmark but are not equal
    to eofmark would be corrupted.  This patch fixes it.

    Test case:

        cat << _ACEOF
        _ASBOX
        _ACEOF

    Old result:

        SASBOX

    New result:

        _ASBOX

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-26 16:26:45 +02:00
Denys Vlasenko
f15aa57a7f ash: [PARSER] Fix parsing of ${##1}
Upstream commit:

    Date: Thu, 4 Oct 2007 22:15:10 +0800
    [PARSER] Fix parsing of ${##1}

    Previously dash treated ${##1} as a length operation.  This patch fixes that.

    Test case:

        set -- a
        echo ${##1}OK

    Old result:

        1OK

    New result:

        OK

This was a real bug in ash (but not in hush).

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-26 15:56:53 +02:00
Denys Vlasenko
e19923f665 ash: [REDIR] Remove redundant CLOEXEC calls
Upstream commit:

    Date: Sun, 6 May 2007 19:28:56 +1000
    [REDIR] Remove redundant CLOEXEC calls

    Now that we're marking file descriptors as CLOEXEC in savefd, we no longer
    need to close them on exec or in setinputfd.

function                                             old     new   delta
ash_main                                            1478    1492     +14
setinputfile                                         224     226      +2
readtoken1                                          2752    2750      -2
shellexec                                            208     198     -10
clearredir                                            30       -     -30
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 2/2 up/down: 16/-42)            Total: -26 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-26 15:38:44 +02:00
Denys Vlasenko
647746076a ash: [REDIR] Replace copyfd by savefd and use dup2 elsewhere
Upstream commit:

    Date: Sat, 12 May 2007 18:00:57 +1000
    [REDIR] Replace copyfd by savefd and use dup2 elsewhere

    There are two kinds of users to copyfd, those that want to copy an fd to
    an exact value and those that want to move an fd to a value >= 10.  The
    former can simply use dup2 directly while the latter share a lot of common
    code that now constitutes savefd.

This does not change much, just reducing our divergence from dash code.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-26 15:24:30 +02:00
Denys Vlasenko
a513bf3c3c ash: [BUILTIN] Treat OPTIND=0 in the same way as OPTIND=1
Upstream commit:

    Date: Sat, 6 Oct 2007 18:59:31 +0800
    [BUILTIN] Treat OPTIND=0 in the same way as OPTIND=1

    Previously setting OPTIND to 0 would cause subsequent getopts calls to fail.
    This patch makes dash reset the getopts parameters the same way as OPTIND=1.

    Both behaviours are allowed by POSIX but other common shells do tolerate this
    case.

function                                             old     new   delta
getoptsreset                                          24      30      +6
getoptscmd                                           632     614     -18

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-26 02:03:37 +02:00
Denys Vlasenko
88e15703ac ash: [PARSER] Report substition errors at expansion time
Upstreams commit:

    Date: Mon, 8 Oct 2007 21:32:25 +0800
    [PARSER] Report substition errors at expansion time

    On Wed, Apr 11, 2007 at 01:24:21PM -0700, Micah Cowan wrote:
    > This operation fails on Ubuntu:
    >
    >     $ /bin/sh -c 'if false; then d="${foo/bar}"; fi'
    >     /bin/sh: Syntax error: Bad substitution
    >
    > When used with other POSIX shells it succeeds. While semantically the
    > variable reference ${foo/bar} is not valid, this is not a syntax error
    > according to POSIX, and since the variable assignment expression is
    > never invoked (because it's within an "if false") it should not be seen
    > as an error.
    >
    > I ran into this because after restarting my system I could no longer log
    > in. It turns out that the problem was (a) I had edited .gnomerc to
    > source my .bashrc file so that my environment would be set properly, and
    > (b) I had added some new code to my .bashrc WITHIN A CHECK FOR BASH!
    > that used bash's ${var/match/sub} feature. Even though this code was
    > within a "case $BASH_VERSION; in *[0-9]*) ... esac (so dash would never
    > execute it since that variable is not set), it still caused dash to
    > throw up.
    >
    > FYI, some relevant details from POSIX:
    >
    > Section 2.3, Token Recognition:
    >
    > 5. If the current character is an unquoted '$' or '`', the shell shall
    > identify the start of any candidates for parameter expansion ( Parameter
    > Expansion), command substitution ( Command Substitution), or arithmetic
    > expansion ( Arithmetic Expansion) from their introductory unquoted
    > character sequences: '$' or "${", "$(" or '`', and "$((", respectively.
    > The shell shall read sufficient input to determine the end of the unit
    > to be expanded (as explained in the cited sections).
    >
    > Section 2.6.2, Parameter Expansion:
    >
    > The format for parameter expansion is as follows:
    >
    >     ${expression}
    >
    > where expression consists of all characters until the matching '}'. Any
    > '}' escaped by a backslash or within a quoted string, and characters in
    > embedded arithmetic expansions, command substitutions, and variable
    > expansions, shall not be examined in determining the matching '}'.
    > [...]
    >
    > The parameter name or symbol can be enclosed in braces, which are
    > optional except for positional parameters with more than one digit or
    > when parameter is followed by a character that could be interpreted as
    > part of the name. The matching closing brace shall be determined by
    > counting brace levels, skipping over enclosed quoted strings, and
    > command substitutions.
    > ---
    > In addition to bash I've checked Solaris /bin/sh and ksh and they don't
    > report an error.
    >
    > -----
    > Micah Cowan:
    >
    > The applicable portion of POSIX is in XCU 2.10.1:
    >
    > "The WORD tokens shall have the word expansion rules applied to them
    > immediately before the associated command is executed, not at the time
    > the command is parsed."
    >
    > This seems fairly clear to me.

    This patch moves the error detection to expansion time.

    Test case:

    	if false; then
    		echo ${a!7}
    	fi
    	echo OK

    Old result:

	dash: Syntax error: Bad substitution

    New result:

	OK

function                                             old     new   delta
evalvar                                              574     585     +11
readtoken1                                          2763    2750     -13

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-26 01:55:56 +02:00
Denys Vlasenko
eaf9436b08 ash: [REDIR] Move null redirect checks into caller
Upstream commit:

    Date: Thu, 27 May 2010 14:21:17 +0800
    [REDIR] Move null redirect checks into caller

    The null redirect checks were added as an optimisation to avoid
    unnecessary memory allocations.  However, we could avoid this
    completely by simply making the caller avoid making a redirection
    unless it is not null.

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

function                                             old     new   delta
evaltree                                             784     809     +25
evalcommand                                         1251    1261     +10
hashvar                                               59      62      +3
dotcmd                                               321     319      -2
clearredir                                            37      30      -7
popredir                                             183     162     -21
redirect                                            1264    1233     -31
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/4 up/down: 63/-61)            Total: -23 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-25 21:46:03 +02:00
Denys Vlasenko
2a6d29ad5c ash: [PARSER] Do not show prompts in expandstr
Upstream patch:

    Date: Thu, 27 Dec 2007 13:57:07 +1100
    [PARSER] Do not show prompts in expandstr

    Once I fixed the previous problem it became apparent that we never dealt
    with prompts with new-lines in them correctly.  The problem is that we
    showed a secondary prompt for each of them.

    This patch disables prompt generation in expandstr.

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

function                                             old     new   delta
expandstr                                            102     127     +25

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-25 21:17:52 +02:00
Denys Vlasenko
579ad107a6 ash: [EXPAND] Removed herefd hack
Upstream commit:

    Date: Sun, 11 Nov 2007 15:00:06 +0800
    [EXPAND] Removed herefd hack

    The herefd hack goes back more than a decade.  it limits the amount of
    memory we have to allocate when expanding here-documents by writing the
    result out from time to time.  However, it's no longer safe because the
    stack is used to place intermediate results too and there we certainly
    don't want to write them out should we be short on memory.

    In any case, with today's computers we can afford to keep the entire
    result in memory and write them out at the end.

function                                             old     new   delta
redirect                                            1268    1264      -4
ash_main                                            1485    1478      -7
subevalvar                                          1157    1132     -25
growstackstr                                          54      24     -30
argstr                                              1192    1154     -38
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/5 up/down: 0/-104)           Total: -104 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-25 21:10:20 +02:00