The proot mode was broken from the start because in contrast to
fakechroot, no ownership information can be retained across multiple
invocations of proot. Since mmdebstrap started using apt from the
outside by setting DPkg::Chroot-Directory in mmdebstrap 0.8.0 proot mode
was finally completely broken because proot cannot wrap the chroot call
done by apt. Users of proot are recommended to run mmdebstrap in
fakechroot mode and then use proot with the resulting directory.
A dependency trace is a powerful tool to debug issues related to
APT's selection of packages, especially in custom mode.
Thus it makes sense to ask APT to output a dependency trace when
`mmdebstrap` is run with the `--debug` flag.
- implements the same as debootstrap in
https://salsa.debian.org/installer-team/debootstrap/-/merge_requests/71
- builds a temporary usr-is-merged package and upgrades to the real one
- create merged-/usr chroots for unstable and testing (which will
become Debian 12 Bookworm)
- add a dedicated merged-/usr section to the manual page
Before, we bind-mounted /dev/ptmx and /dev/pts from the host into the
chroot. This will make posix_openpt() fail with 'No such file or
directory'. The ability to create pseudo terminals is important for apt
(which will throw a warning otherwise) or running script(1) or source
package testsuites like for src:util-linux. This functionality is
restored by mounting a new devpts instance to /dev/pts and making
/dev/ptmx a symlink to /dev/pts/ptmx. Mounting with ptmxmode=666 is
required such that also non-root users in unshare mode are able to
create pseudo terminals. See also:
https://www.kernel.org/doc/Documentation/filesystems/devpts.txthttps://salsa.debian.org/debian/schroot/-/merge_requests/2https://bugs.debian.org/856877https://bugs.debian.org/817236
