$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk-pixbuf0.19.git /var/lib/mock/f42-build-side-1-3504281-45983/root/chroot_tmpdir/scmroot/rust-gdk-pixbuf0.19
Cloning into '/var/lib/mock/f42-build-side-1-3504281-45983/root/chroot_tmpdir/scmroot/rust-gdk-pixbuf0.19'...
$ git fetch origin 376941b05d68f6959b85d1c0e8018a8d3a6d7ecc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk-pixbuf0.19
 * [new ref]         376941b05d68f6959b85d1c0e8018a8d3a6d7ecc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 376941b compat package no longer needed