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Bug#1031105: unshared debootstrap fails if auto-apt-proxy is installed

On Sat, 11 Feb 2023 21:12:33 +0100 Johannes Schauer Marin Rodrigues <josch@debian.org> wrote:
> Package: debootstrap
> Version: 1.0.128+nmu2
> Severity: normal
> X-Debbugs-Cc: terceiro@debian.org
> Control: affects -1 auto-apt-proxy mmdebstrap
> Hi,
> currently the mmdebstrap autopkgtest in experimental fails because debootstrap
> cannot be run with the user namespace unshared if auto-apt-proxy is installed
> and /tmp/.auto-apt-proxy-0 exists. Steps to reproduce:
> $ mmdebstrap --variant=custom --mode=unshare --setup-hook='env container=lxc debootstrap unstable "$1"' /dev/null
> The error message is:
> E: insecure cache dir /tmp/.auto-apt-proxy-0. Must be owned by UID 0 and have permissions 700
> The reason for this error is, that debootstrap will run auto-apt-proxy which
> will find that /tmp/.auto-apt-proxy-0 exists but since the user namespace of
> the process is unshared, it will be owned by user "nobody" from its
> perspective.
> Please provide a way to allow disabling running auto-apt-proxy when running
> debootstrap.

Maybe I am missing something, but debootstrap has no knowledge about
auto-apt-proxy, why would debootstrap be the one responsible for
disabling auto-apt-proxy? Shouldn't mmdebstrap setup a reasonable
(empty) /tmp since it's the one who is setting up the unshared user

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