$ git clone -n https://src.fedoraproject.org/rpms/did.git /var/lib/mock/f39-build-1701704-41209/root/chroot_tmpdir/scmroot/did
Cloning into '/var/lib/mock/f39-build-1701704-41209/root/chroot_tmpdir/scmroot/did'...
$ git fetch origin def7ac2bd4a34078da6d4edc74a6df21f273466d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/did
 * [new ref]         def7ac2bd4a34078da6d4edc74a6df21f273466d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at def7ac2 Release did-0.21