$ git clone -n https://src.fedoraproject.org/rpms/proxmark3.git /var/lib/mock/f38-build-side-42-init-devel-919580-28734/root/chroot_tmpdir/scmroot/proxmark3
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-919580-28734/root/chroot_tmpdir/scmroot/proxmark3'...
$ git fetch origin 21fc50fae38057291d8e427f6f7a627d5effa0d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/proxmark3
 * [new ref]         21fc50fae38057291d8e427f6f7a627d5effa0d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21fc50f Bump to v4.16191 Use lookaside cache for package sources