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This comes from an old Debian bug report http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=588477 which refers to http://lists.xen.org/archives/html/xen-users/2010-06/msg00420.html. Although we no longer have a trap in _claim_lock as described (this was removed in 25590:bb250383a4f5 "hotplug/Linux: use flock based locking") and the use of network-* scripts is discouraged (in favour of using distro provided mechanisms) the general principal that relying on the semantics of /bin/sh's && is unwise seems sound. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Committed-by: Ian Campbell <ian.campbell@citrix.com>