Pkg xen devel - Nov 2011 - Bug#648029: xen-utils-common: /usr/lib/xen-common/bin/xen-toolstack (and thus /usr/sbin/xm) works with bash, but not dash

Package: xen-utils-common
Version: 4.1.2-1
Severity: grave
Justification: renders package unusable

(Grave because dash is the default /bin/sh)

With dash 0.5.5.1-7.4 as /bin/sh, /usr/sbin/xm enters an infinite loop
of reexcuting itself. When run with bash, it works correctly.

I traced that to /usr/lib/xen-common/bin/xen-toolstack; here's the
diff between "/bin/sh -x /usr/sbin/xm" and "/bin/bash -x
/usr/sbin/xm";
the output of "/bin/bash -x /usr/sbin/xm" has been post-processed to
remove spurious differences, such as multiple "+" at start of line
(that in bash show recursion/inclusion level), "'['" vs
"[", etc.

 + [ -z  ]
 + check xm
 + [ xm = xm ]
-+ PATH=/usr/lib/xen-4.1/bin command -v xm
-+ cmd_xm=/usr/sbin/xm
++ PATH=/usr/lib/xen-4.1/bin
++ command -v xm
++ cmd_xm=/usr/lib/xen-4.1/bin/xm
 + check xl
 + [ xl = xm ]
 + [ xl = xl ]
-+ PATH=/usr/lib/xen-4.1/bin command -v xl
-+ cmd_xl=/usr/sbin/xl
-+ [ /usr/sbin/xm ]
-+ echo /usr/sbin/xm
-+ TOOLSTACK=/usr/sbin/xm
++ PATH=/usr/lib/xen-4.1/bin
++ command -v xl
++ cmd_xl=/usr/lib/xen-4.1/bin/xl
++ [ /usr/lib/xen-4.1/bin/xm ]
++ echo /usr/lib/xen-4.1/bin/xm
++ TOOLSTACK=/usr/lib/xen-4.1/bin/xm
 + RET=0
 + [ 0 -eq 0 ]
-+ basename /usr/sbin/xm
++ basename /usr/lib/xen-4.1/bin/xm
 + [ xm != xm ]
-+ exec /usr/sbin/xm
++ exec /usr/lib/xen-4.1/bin/xm

Plainly, the idiom "PATH=FOO command -v bar" does not work with
dash. This seems to work:

 local PATH_old
 PATH_old="${PATH}"
 PATH=FOO
 command -v bar
 PATH="${PATH_old}"

Or maybe more devious (but untested):

 local PATH
 PATH=FOO
 command -v bar

-- System Information:
Debian Release: 6.0.3
  APT prefers stable
  APT policy: (500, 'stable'), (400, 'testing'), (300,
'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-xen-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_LU.UTF-8, LC_CTYPE=fr_LU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages xen-utils-common depends on:
ii  gawk                    1:3.1.7.dfsg-5   GNU awk, a pattern scanning and pr
ii  lsb-base                3.2-23.2squeeze1 Linux Standard Base 3.2 init scrip
ii  udev                    164-3            /dev/ and hotplug management daemo
ii  xenstore-utils          4.0.1-4          Xenstore utilities for Xen

xen-utils-common recommends no packages.

xen-utils-common suggests no packages.

-- Configuration Files:
/etc/xen/xend-config.sxp changed:
(network-script 'network-camp netdev=eth0 bridge=xenbr0')
(vif-script 'vif-bridge bridge=xenbr0')
(dom0-min-mem 196)
(enable-dom0-ballooning yes)
(total_available_memory 0) 
(dom0-cpus 0)
(vncpasswd '')
(keymap 'fr-be')


-- no debconf information

I can confirm that 648029.patch fixes this issue.

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How about changing the shebang of the xen-toolstack-wrapper by bash
directly to avoid further issues ?
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Your message dated Mon, 16 Apr 2012 09:18:49 +0000
with message-id <E1SJi5B-0002lP-Aw at franck.debian.org>
and subject line Bug#648029: fixed in xen 4.1.2-4
has caused the Debian Bug report #648029,
regarding xen-utils-common: /usr/lib/xen-common/bin/xen-toolstack (and thus
/usr/sbin/xm) works with bash, but not dash
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner at bugs.debian.org
immediately.)


-- 
648029: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=648029
Debian Bug Tracking System
Contact owner at bugs.debian.org with problems
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From: Lionel Elie Mamane <lionel at mamane.lu>
Subject: xen-utils-common: /usr/lib/xen-common/bin/xen-toolstack (and thus
/usr/sbin/xm) works with bash, but not dash
Date: Tue, 8 Nov 2011 12:58:32 +0100
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From: Bastian Blank <waldi at debian.org>
Subject: Bug#648029: fixed in xen 4.1.2-4
Date: Mon, 16 Apr 2012 09:18:49 +0000
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