$ git clone -n https://src.fedoraproject.org/rpms/rust-asn1.git /var/lib/mock/f39-build-1454957-32912/root/chroot_tmpdir/scmroot/rust-asn1
Cloning into '/var/lib/mock/f39-build-1454957-32912/root/chroot_tmpdir/scmroot/rust-asn1'...
$ git fetch origin f8d8f6feb20712b835549d57a4a0c1247e9ab264:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-asn1
 * [new ref]         f8d8f6feb20712b835549d57a4a0c1247e9ab264 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8d8f6f Obsolete const-generics feature