Just as a followup on the question i posted back in january... On Tue, Jan 18, 2011 at 10:29:56PM +0100, Marcus Osdoba wrote >Am 09.01.2011 15:26, schrieb Johannes Schauer: >> hi, >> >> my goal is to build an armel rootfs without the need of super user >> privileges. >> >Hi, I have the same requirement and want to avoid superuser rights for >launching multistrap and chroot'ing into generated rootfs. > >If you somehow found a solution for this, I am also interested in.
I solved it! :D If you just put qemu-arm-static into the chroot and then execute: $ fakeroot fakechroot chroot $ROOTDIR /bin/true it would return: "Unable to load interpreter". But it will work whithout fakeroot/fakechroot using the normal chroot(8). The solution is to help it finding the shared armel libraries correctly. With qemu-arm-static the solution is to append -L. For example this would not work: $ qemu-arm-static $ROOTDIR/bin/true Unable to load interpreter but this will work: $ qemu-arm-static -L $ROOTDIR $ROOTDIR/bin/true Since it is troublesome to pass over the ELF interpreter prefix when letting qemu-arm-static being run automatically by the kernel's binfmt support the solution is to put the shared libraries (armel in my case) into the default directory for qemu-arm-static. The man page says /usr/gnemul/qemu-arm but this is wrong and indeed is /etc/qemu-binfmt/arm/. It is sufficient to only put the $ROOTDIR/lib directory there. Indeed it is sufficient to only put armel versions of ld-2.11.2.so, ld-linux.so.3, libc-2.11.2.so and libc.so.6 into /etc/qemu-binfmt/arm/lib/. Every armel binary on the system can now be executed right away just as if it were a native one. This is damn cool! $ $ROOTDIR/bin/true <= this works just like that!! :D The next errors will be: $ fakeroot fakechroot chroot $ROOTDIR /bin/true ERROR: ld.so: object 'libfakechroot.so' from LD_PRELOAD cannot be preloaded: ignored. ERROR: ld.so: object 'libfakeroot-sysv.so' from LD_PRELOAD cannot be preloaded: ignored. To fix those, just put armel versions of libfakechroot.so and libfakeroot-sysv.so into /usr/lib/arm-linux-gnueabi/. It's done!! you can now create a full foreign debian rootfs without having to use any root priviliges! I have a small script that i use for this - it is not complete but does the most basic things and outputs a tarball with the proper permissions: http://mister-muffin.de/p/rzM8 The whole thing is of course run within a fakeroot call. One interesting bit in this script is to temporary replace /sbin/ldconfig since fakechroot can't handle it. It's switched back to the original one in the end. I put the armel binary into the correct place by using these commands: wget http://ftp.debian.org/debian/pool/main/f/fakechroot/fakechroot_2.14-1_armel.deb wget http://ftp.debian.org/debian/pool/main/f/fakeroot/fakeroot_1.14.5-1_armel.deb wget http://ftp.debian.org/debian/pool/main/e/eglibc/libc6_2.11.2-11_armel.deb sudo mkdir -p /etc/qemu-binfmt/arm/ sudo mkdir -p /usr/lib/arm-linux-gnueabi/ sudo dpkg -x libc6_2.11.2-11_armel.deb /etc/qemu-binfmt/arm/ dpkg-deb --fsys-tarfile fakeroot_1.14.5-1_armel.deb | sudo tar -xf - --strip-components=4 -C /usr/lib/arm-linux-gnueabi/ ./usr/lib/libfakeroot/libfakeroot-sysv.so dpkg-deb --fsys-tarfile fakechroot_2.14-1_armel.deb | sudo tar -xf - --strip-components=4 -C /usr/lib/arm-linux-gnueabi/ ./usr/lib/fakechroot/libfakechroot.so rm fakechroot_2.14-1_armel.deb fakeroot_1.14.5-1_armel.deb libc6_2.11.2-11_armel.deb I hope this is useful for somebody. have a nice day, josch -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/795777009.309109.1301699509491.JavaMail.fmail@mwmweb070
