Package: mmdebstrap Version: 1.3.8-3 Severity: normal The code for --format=tar/squashfs/ext2/null creates a temporary directory in the $TMP dir. When libpam-tmpdir is being used, $TMP is set to a directory that the current user can access but no other user can access. Consequently because mmdebstrap uses a separate user namespace(?) it cannot access the temporary dir it just created. In addition, it fails to clean up that temporary dir after the error.
This does not happen when TMP is set to /tmp with libpam-tmpdir off. Probably the solution would be to reset TMP to /tmp when the current value isn't usable after the namespace change, or to create the temporary dir in the same directory as the output if there is one. The same should happen to the TMPDIR/TEMP/TEMPDIR variables, since usage of TMP is not universal across all packages. $ env | grep -E 'TE?MP' TEMPDIR=/tmp/user/1000 TMPDIR=/tmp/user/1000 TEMP=/tmp/user/1000 TMP=/tmp/user/1000 $ ls -ld /tmp /tmp/user /tmp/user/1000 drwxrwxrwt 25 root root 16K Sep 22 23:39 /tmp/ drwx--x--x 7 root root 4.0K Sep 16 13:22 /tmp/user/ drwx------ 16 pabs root 4.0K Sep 22 23:51 /tmp/user/1000/ $ mmdebstrap unstable /dev/null I: automatically chosen mode: unshare I: chroot architecture amd64 is equal to the host's architecture I: finding correct signed-by value... done I: automatically chosen format: null I: using /tmp/user/1000/mmdebstrap.mAT11ELelW as tempdir E: cannot create /tmp/user/1000/mmdebstrap.mAT11ELelW: Permission denied; cannot create /tmp/user/1000/mmdebstrap.mAT11ELelW//etc: Permission denied; cannot create /tmp/user/1000/mmdebstrap.mAT11ELelW//etc/apt: Permission denied; cannot create /tmp/user/1000/mmdebstrap.mAT11ELelW//etc/apt/apt.conf.d: Permission denied I: main() received signal PIPE: waiting for setup... I: removing tempdir /tmp/user/1000/mmdebstrap.mAT11ELelW... env: cannot change directory to '/tmp/user/1000/mmdebstrap.mAT11ELelW': Permission denied E: rm failed: 32000 E: remove_tree failed $ echo $? 29 $ find /tmp/user/1000/mmdebstrap.mAT11ELelW /tmp/user/1000/mmdebstrap.mAT11ELelW $ ls -ld /tmp/user/1000/mmdebstrap.mAT11ELelW drwxr-xr-x 2 296608 296608 4.0K Sep 22 23:54 /tmp/user/1000/mmdebstrap.mAT11ELelW $ rmdir /tmp/user/1000/mmdebstrap.mAT11ELelW -- System Information: Debian Release: trixie/sid APT prefers testing-debug APT policy: (900, 'testing-debug'), (900, 'testing'), (800, 'unstable-debug'), (800, 'unstable'), (790, 'buildd-unstable'), (700, 'experimental-debug'), (700, 'experimental'), (690, 'buildd-experimental') merged-usr: no Architecture: amd64 (x86_64) Kernel: Linux 6.5.0-1-amd64 (SMP w/4 CPU threads; PREEMPT) Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=en_AU.utf8, LC_CTYPE=en_AU.utf8 (charmap=UTF-8), LANGUAGE=en_AU:en Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages mmdebstrap depends on: ii apt 2.7.3 ii perl 5.36.0-9 ii python3 3.11.4-5+b1 Versions of packages mmdebstrap recommends: ii arch-test 0.21-1 ii fakechroot 2.20.1+ds-15 ii fakeroot 1.32.1-1 ii gpg 2.2.40-1.1 ii libdistro-info-perl 1.5 ii libdpkg-perl 1.22.0 ii mount 2.39.2-1 ii pseudo [fakeroot] 1.9.0+git20230301+ec6151a2b057-1 ii uidmap 1:4.13+dfsg1-1+b1 Versions of packages mmdebstrap suggests: ii apt-transport-tor 0.5 ii apt-utils 2.7.3 ii binfmt-support 2.2.2-2 ii ca-certificates 20230311 ii debootstrap 1.0.132 ii distro-info-data 0.58 ii dpkg-dev 1.22.0 ii genext2fs 1.5.0-3 ii perl-doc 5.36.0-9 pn qemu-user <none> ii qemu-user-static 1:8.1.0+ds-6 ii squashfs-tools-ng 1.2.0-1 ii systemd 254.1-3 -- no debconf information -- bye, pabs https://wiki.debian.org/PaulWise
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