I can replicate this issue with the following invocation of mmdebstrap:
$ mmdebstrap --variant=custom --include=foobarbaz \
unstable "test-HANGS.tar" \
"deb http://deb.debian.org/debian unstable main"
I: automatically chosen mode: unshare
I: chroot architecture amd64 is equal to the host's architecture
I: automatically chosen format: tar
I: using /tmp/mmdebstrap.ZQMkoMamRj as tempdir
I: running apt-get update...
done
I: downloading packages with apt...
done
Reading package lists...
Building dependency tree...
E: Unable to locate package foobarbaz
E: apt-get --yes -oDebug::pkgDpkgPm=1 -oDir::Log=/dev/null
-oAPT::Keep-Fds::=7 -oDPkg::Tools::options::'cat >&7'::InfoFD=7
-oDpkg::Pre-Install-Pkgs::=cat >&7 -oDebug::NoLocking=1
-oDpkg::Use-Pty=0 install foobarbaz -oAPT::Status-Fd=<$fd>
-oDpkg::Use-Pty=false failed
[...stop here...]
^CI: main() received signal INT: waiting for setup...
W: listening on child socket failed:
I: removing tempdir /tmp/mmdebstrap.ZQMkoMamRj...
E: mmdebstrap failed to run
--
Gioele Barabucci
