$ git clone -n https://src.fedoraproject.org/rpms/observable.git /var/lib/mock/f38-build-side-42-init-devel-1132924-30347/root/chroot_tmpdir/scmroot/observable
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1132924-30347/root/chroot_tmpdir/scmroot/observable'...
$ git fetch origin 1c0adf2a07956049a31d2a6f3d31101ab829dd2b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/observable
 * [new ref]         1c0adf2a07956049a31d2a6f3d31101ab829dd2b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c0adf2 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild