$ git clone -n https://src.fedoraproject.org/rpms/resteasy.git /var/lib/mock/f38-build-side-42-init-devel-716674-27295/root/chroot_tmpdir/scmroot/resteasy
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-716674-27295/root/chroot_tmpdir/scmroot/resteasy'...
$ git fetch origin f9fe8b40825b9b06eb9e070bdbd3313aea617dbd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/resteasy
 * [new ref]         f9fe8b40825b9b06eb9e070bdbd3313aea617dbd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f9fe8b4 Remove dependency onjaxb-api2 compat package