Cross debootstrap without root rights
Hi Debian users, I'd like to run the second stage of debootstrap without root rights, but for another architecture (host is x86_64 and target is arm64). I know how to do all that with root rights (i.e qemu-aarch64-static works perfectly here, also, I can recommend using qemu-debootstrap), but I can't figure out a way how to do that without root rights. I was expecting that fakechroot and fakeroot will do the necessary "magic" to make chroot work for my use-case, but that's not the case (I need to have libfakeroot.so and libfakechroot.so in the target rootfs, but I could not find a reliable way to get them in). I found some emails in the archives about similar use cases (from ~10 years ago). But I failed to identify the solution in those cases. Therefore I'd like to ask if anyone has a solution for my use case or some hints/pointers. Thanks, Christoph
Re: Cross debootstrap without root rights
Hi Jonas, thanks for the pointer. I was hoping for a solution like mmdebstrap. Will give it a try or will at least use it as inspiration. Thanks a lot, Christoph On Sun, Feb 9, 2020 at 1:25 PM Jonas Smedegaard wrote: > Hi Christoph, > > Quoting Christoph Müllner (2020-02-09 12:54:56) > > I'd like to run the second stage of debootstrap without root rights, > > but for another architecture (host is x86_64 and target is arm64). > > > > I know how to do all that with root rights (i.e qemu-aarch64-static > > works perfectly here, also, I can recommend using qemu-debootstrap), > > but I can't figure out a way how to do that without root rights. > > > > I was expecting that fakechroot and fakeroot will do the necessary > > "magic" to make chroot work for my use-case, but that's not the case > > (I need to have libfakeroot.so and libfakechroot.so in the target > > rootfs, but I could not find a reliable way to get them in). > > > > I found some emails in the archives about similar use cases (from ~10 > > years ago). But I failed to identify the solution in those cases. > > > > Therefore I'd like to ask if anyone has a solution for my use case or > > some hints/pointers. > > Have a look at mmdebstrap! > > The author of that tool - Johannes Schauer - has long fought for ways to > eliminate the need for being root to bootstrap Debian, and mmdebstrap is > as I understand it the state of the art of that! > > > - Jonas > > -- > * Jonas Smedegaard - idealist & Internet-arkitekt > * Tlf.: +45 40843136 Website: http://dr.jones.dk/ > > [x] quote me freely [ ] ask before reusing [ ] keep private >
Re: Cross debootstrap without root rights
Hi Hector, thanks for the pointer to debos. That tool seems to fit quite well (especially the ability to invoke user scripts for customizations), although access to /dev/kvm is quite some price to pay (but already much much better than root rights). Thanks a lot, Christoph On Sun, Feb 9, 2020 at 6:14 PM Hector Oron wrote: > > Hello Christoph, > > Missatge de Christoph Müllner del dia dg., 9 > de febr. 2020 a les 12:55: > > > I was expecting that fakechroot and fakeroot will do the necessary "magic" > > to make chroot work for my use-case, but that's not the case (I need to have libfakeroot.so > > and libfakechroot.so in the target rootfs, but I could not find a reliable way to get them in). > > > > I found some emails in the archives about similar use cases (from ~10 years ago). > > But I failed to identify the solution in those cases. > > Nowadays I use debos if I need to create rootless filesystems, you can > read the following article to get an idea how it works: > https://ekaia.org/blog/2018/07/03/introducing-debos/ > > Regards > -- > Héctor Orón -.. . -... .. .- -. -.. . ...- . .-.. --- .--. . .-.
Re: Cross debootstrap without root rights
Hi Josch, [I did not get your email, I just saw it in the mail archives...] thanks for the overview and the reference to the bug ticket. I've succeeded with the fakechroot/fakeroot approach and got the required inspiration for setting LD_LIBRARY_PATH from your tool and https://bugs.debian.org/855234 <https://bugs.debian.org/829134> (libsystemd-shared wanted to be found as well). Thanks for your help, Christoph Hi, > > (please CC me, I'm not subscribed to d-user@l.d.o) > > Quoting Christoph Müllner (2020-02-09 12:54:56) > > I'd like to run the second stage of debootstrap without root rights, but > for > > another architecture (host is x86_64 and target is arm64). > > > > I know how to do all that with root rights (i.e qemu-aarch64-static works > > perfectly here, also, I can recommend using qemu-debootstrap), but I > can't > > figure out a way how to do that without root rights. > > > > I was expecting that fakechroot and fakeroot will do the necessary > "magic" to > > make chroot work for my use-case, but that's not the case (I need to have > > libfakeroot.so and libfakechroot.so in the target rootfs, but I could not > > find a reliable way to get them in). > > > > I found some emails in the archives about similar use cases (from ~10 > years > > ago). But I failed to identify the solution in those cases. > > > > Therefore I'd like to ask if anyone has a solution for my use case or > some > > hints/pointers. > > yes, there are several solutions. Either: > > a) You can use mmdebstrap which is a debootstrap replacement that focuses > on >not requiring superuser privileges and has foreign architecture support >built in: > >$ mmdebstrap --arch=arm64 unstable debian-unstable.tar > > b) There is a proof-of-concept that allows one to run debootstrap with >unprivileged usernamespaces here: https://bugs.debian.org/829134 This > will >probably also work with --second-stage > > c) Getting fakechroot and fakeroot to work with foreign architectures is > tricky >and requires the right libfakechroot.so being installed and several >environment variables to be set differently. You can have a look at how > mmdebstrap does this so that you can maybe replicate that for > debootstrap: >https://sources.debian.org/src/mmdebstrap/0.6.0-4/mmdebstrap/#L1942 > > Thanks! > > cheers, josch > > On Sun, Feb 9, 2020 at 12:54 PM Christoph Müllner > wrote: > >> Hi Debian users, >> >> I'd like to run the second stage of debootstrap without root rights, >> but for another architecture (host is x86_64 and target is arm64). >> >> I know how to do all that with root rights (i.e qemu-aarch64-static works >> perfectly here, >> also, I can recommend using qemu-debootstrap), but I can't figure out a >> way how to do >> that without root rights. >> >> I was expecting that fakechroot and fakeroot will do the necessary "magic" >> to make chroot work for my use-case, but that's not the case (I need to >> have libfakeroot.so >> and libfakechroot.so in the target rootfs, but I could not find a >> reliable way to get them in). >> >> I found some emails in the archives about similar use cases (from ~10 >> years ago). >> But I failed to identify the solution in those cases. >> >> Therefore I'd like to ask if anyone has a solution for my use case or >> some hints/pointers. >> >> Thanks, >> Christoph >> >>
