On Sat, Nov 28, 2015 at 12:30:52AM +0100, Cyril Brulebois wrote: > Now if I log out of the schroot session, remove my user 'kibi' from the > cdrom group and re-enter a schroot session, I'm now getting a failure on > the next group: > | (sid-amd64-devel)kibi@wodi:~/debian-installer/installer$ make -C build > build_netboot-gtk USE_UDEBS_FROM=sid > | make: Entering directory '/home/kibi/debian-installer/installer/build' > | Using generated sources.list.udeb: > | deb [trusted=yes] copy:/home/kibi/debian-installer/installer/build/ > localudebs/ > | deb http://localhost/debian sid main/debian-installer > | make[2]: 'sources.list.udeb' is up to date. > | Reading package lists... Done > | E: Method gave invalid 400 URI Failure message: Could not switch group, > user _apt is still in group 25 > | E: Method gave invalid 400 URI Failure message: Could not switch group, > user _apt is still in group 25 > | E: Method copy has died unexpectedly! > | E: Sub-process copy returned an error code (112) > | > | (sid-amd64-devel)kibi@wodi:~/debian-installer/installer$ getent group floppy > | floppy:x:25:kibi > | > | (sid-amd64-devel)kibi@wodi:~/debian-installer/installer$ groups > | kibi floppy audio dip video plugdev sbuild kvm libvirt > > Iterating again, I'm now failing because of the audio group…
Mhhhhhh. apt is run as root (as we don't reach this codepath with uid != 0), but it has all the groups of kibi and a setgroups is silently ignored… wtf… The code is if someone wants to look: https://anonscm.debian.org/cgit/apt/apt.git/tree/apt-pkg/contrib/fileutl.cc#n2264 I will go to bed now, maybe I have an epiphany tomorrow. (or manage to reproduce this for a start) > While I've been experimenting with adding/removing myself from the said > groups, I'm noticed this a few times, without being able to figure out > what exactly causes this… > | W: No sandbox user '_apt' on the system, can not drop privileges > > In which case, going back to apt.git and "sudo debi -u" to reinstall all > packages I've built seems to fix the issue. As mentioned briefly schroot copies users & groups from your host system, so if your host system has no _apt user, the _apt user in your schroot will "disappear" next time it is copied over. Best regards David Kalnischkies
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