$ git clone -n https://src.fedoraproject.org/rpms/perl-POSIX-2008.git /var/lib/mock/f40-build-779723-130466/root/chroot_tmpdir/scmroot/perl-POSIX-2008
Cloning into '/var/lib/mock/f40-build-779723-130466/root/chroot_tmpdir/scmroot/perl-POSIX-2008'...
$ git fetch origin 382bca51602a473b4b2c3d3e05ac857d06488979:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-POSIX-2008
 * [new ref]         382bca51602a473b4b2c3d3e05ac857d06488979 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 382bca5 0.23 bump