$ git clone -n https://src.fedoraproject.org/rpms/libdb.git /var/lib/mock/f41-build-side-1-2751709-31120/root/chroot_tmpdir/scmroot/libdb
Cloning into '/var/lib/mock/f41-build-side-1-2751709-31120/root/chroot_tmpdir/scmroot/libdb'...
$ git fetch origin 38ca362e1f6d599cd8d73eed3da234a34f2fca92:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdb
 * [new ref]         38ca362e1f6d599cd8d73eed3da234a34f2fca92 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 38ca362 Fix flatpak build