$ git clone -n https://src.fedoraproject.org/rpms/snapshot.git /var/lib/mock/f40-build-2379424-60444/root/chroot_tmpdir/scmroot/snapshot
Cloning into '/var/lib/mock/f40-build-2379424-60444/root/chroot_tmpdir/scmroot/snapshot'...
$ git fetch origin fc56ff934284cfa31a8a47beb98f16d5e7130cd0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/snapshot
 * [new ref]         fc56ff934284cfa31a8a47beb98f16d5e7130cd0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc56ff9 Update Rust macro usage