$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-refspec.git /var/lib/mock/f38-build-side-43-rust-devel-1411871-31436/root/chroot_tmpdir/scmroot/rust-gix-refspec
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1411871-31436/root/chroot_tmpdir/scmroot/rust-gix-refspec'...
$ git fetch origin b372de411b7184be28582c5d2c6ac8e32d11ea96:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-refspec
 * [new ref]         b372de411b7184be28582c5d2c6ac8e32d11ea96 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b372de4 Update to version 0.19.0