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busybox: no longer falles back to busybox applets if no executable if found

Package: busybox
Version: 1:1.9.1-3
Severity: important

CC'ing initramfs-tools maintainer, as it directly affects hooks into 

BusyBox 1.1.3 implemented a fallback to its own applets in case no 
executable could be found:

	BusyBox v1.1.3 (Debian 1:1.1.3-5) Built-in shell (ash)
	Enter 'help' for a list of built-in commands.
	~ $ printf "foo\n"
	~ $ PATH=
	~ $ export PATH
	~ $ printf "foo\n"

while BusyBox 1.9.1 just throws an error

	BusyBox v1.9.1 (2008-03-22 22:06:19 UTC) built-in shell (ash)
	Enter 'help' for a list of built-in commands.
	~ $ printf "foo\n"
	~ $ PATH=
	~ $ export PATH
	~ $ printf "foo\n"
	ash: printf: not found

Even though this behaviour is understandable, it does break hooks into 
current initramfs-tools making use of functionality neither provided by 
klibc nor busybox built-ins (but only as applets for busybox), because 
initramfs-tools doesn't create {hard,sym}links to busybox (#338405).

Potentially affected packages (not checked in depths):
- bootcd-mkinitramfs (it seems to use grep)
- cryptsetup (it does use basename #466240 and seems to use grep)
- evms (it seems to use grep)
- initramfs-tools (it does use printf and seems to use awk as well)
- live-initramfs (it seems to use awk, basename, grep and printf)
- loop-aes-utils (it seems to use grep)
- ltsp-client-core (it seems to use grep
- mdadm (it seems to use grep)
- nbd-client (it seems to use grep)
- splashy (it seems to use grep)
- uswsusp (it seems to use grep)

A workaround seems to be enabling 
FEATURE_SH_STANDALONE was enabled in busybox 1.1.3, even though it prefers
busybox applets in favour of shipped executables (unless called with full 
path names), it might be needed until a better long term solution can be found.

	Stefan Lippers-Hollmann

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.24- (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages busybox depends on:
ii  libc6                         2.7-9      GNU C Library: Shared libraries

busybox recommends no packages.

-- no debconf information

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