$ git clone -n https://src.fedoraproject.org/rpms/perl-PadWalker.git /var/lib/mock/f45-build-25632-612/root/chroot_tmpdir/scmroot/perl-PadWalker
Cloning into '/var/lib/mock/f45-build-25632-612/root/chroot_tmpdir/scmroot/perl-PadWalker'...
$ git fetch origin a9230e38071594ac9eed9e42394d5b9b993abc83:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-PadWalker
 * [new ref]         a9230e38071594ac9eed9e42394d5b9b993abc83 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9230e3 Perl 5.44 rebuild