$ git clone -n https://src.fedoraproject.org/rpms/rust-pango0.19.git /var/lib/mock/f42-build-side-1-3589317-46957/root/chroot_tmpdir/scmroot/rust-pango0.19
Cloning into '/var/lib/mock/f42-build-side-1-3589317-46957/root/chroot_tmpdir/scmroot/rust-pango0.19'...
$ git fetch origin ebd75e3d0a2967915e071f29d0ac6a23d20de9fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pango0.19
 * [new ref]         ebd75e3d0a2967915e071f29d0ac6a23d20de9fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ebd75e3 compat package no longer needed