As far as I understand, /usr/bin/fakechroot sources the chroot.env
script to setup the substitution of /usr/sbin/chroot.fakechroot for
/usr/sbin/chroot.
At /usr/sbin/chroot invocation (through execve),
/usr/sbin/chroot.fakechroot runs instead and parses /etc/ld.so.conf*
in the target (fake)chroot to populate LD_LIBRARY_PATH. The
multiarch paths are added this way.
Eventually /usr/sbin/chroot is run, and the function chroot of
libfakechroot adds the paths /usr/lib and /lib under the target (fake)chroot.
The syntax "fakeroot fakechroot chroot ..." fails to setup the substitution
of /usr/sbin/chroot.fakechroot for /usr/sbin/chroot : the bottom line of
/usr/bin/fakechroot
env LD_LIBRARY_PATH="$paths" LD_PRELOAD="$lib" "$@"
adds LD_PRELOAD to the environment of the command (ie chroot), not of env.
Instead of the function "execve" from libfakechroot the one of libc6 is
executed by env - hence the substitution doesn't take place.
The syntax "fakeroot fakechroot env chroot ..." fails to select automatically
the environment script chroot.env.
And the syntax "fakeroot fakechroot -e chroot env chroot ..." works...
As an alternative, we could patch /usr/bin/fakechroot to obtain the same
result (see the following patch as an illustration). We then get the same
value of LD_LIBRARY_PATH whatever the relative order of fakeroot and
fakechroot :
me@here:~$ fakeroot fakechroot chroot /home/me/my_wheezy_chroot
# echo $LD_LIBRARY_PATH
/home/me/my_wheezy_chroot/usr/lib/i386-linux-gnu/libfakeroot:
/home/me/my_wheezy_chroot/usr/lib64/libfakeroot:
/home/me/my_wheezy_chroot/usr/lib32/libfakeroot:
/home/me/my_wheezy_chroot/lib/i386-linux-gnu:
/home/me/my_wheezy_chroot/usr/lib/i386-linux-gnu:
/home/me/my_wheezy_chroot/lib/i486-linux-gnu:
/home/me/my_wheezy_chroot/usr/lib/i486-linux-gnu:
/home/me/my_wheezy_chroot/usr/local/lib:
/usr/lib/i386-linux-gnu/libfakeroot:
/usr/lib64/libfakeroot:/usr/lib32/libfakeroot:
/home/me/my_wheezy_chroot/usr/lib:
/home/me/my_wheezy_chroot/lib
(breaking a long line at ":" )
me@here:~$ fakechroot fakeroot chroot /home/me/my_wheezy_chroot
# echo $LD_LIBRARY_PATH
/home/me/my_wheezy_chroot/usr/lib/i386-linux-gnu/libfakeroot:
/home/me/my_wheezy_chroot/usr/lib64/libfakeroot:
/home/me/my_wheezy_chroot/usr/lib32/libfakeroot:
/home/me/my_wheezy_chroot/lib/i386-linux-gnu:
/home/me/my_wheezy_chroot/usr/lib/i386-linux-gnu:
/home/me/my_wheezy_chroot/lib/i486-linux-gnu:
/home/me/my_wheezy_chroot/usr/lib/i486-linux-gnu:
/home/me/my_wheezy_chroot/usr/local/lib:
/usr/lib/i386-linux-gnu/libfakeroot:
/usr/lib64/libfakeroot:/usr/lib32/libfakeroot:
/home/me/my_wheezy_chroot/usr/lib:
/home/me/my_wheezy_chroot/lib
Regards,
JH Chatenet
--- a/scripts/fakechroot.sh 2011-12-11 13:05:34.000000000 +0100
+++ b/scripts/fakechroot.sh 2013-08-24 14:27:27.000000000 +0200
@@ -136,10 +136,10 @@
# Execute command
if [ -z "$*" ]; then
- env LD_LIBRARY_PATH="$paths" LD_PRELOAD="$lib" ${SHELL:-/bin/sh}
+ LD_LIBRARY_PATH="$paths" LD_PRELOAD="$lib" env ${SHELL:-/bin/sh}
result=$?
else
- env LD_LIBRARY_PATH="$paths" LD_PRELOAD="$lib" "$@"
+ LD_LIBRARY_PATH="$paths" LD_PRELOAD="$lib" env "$@"
result=$?
fi
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