$ git clone -n https://src.fedoraproject.org/rpms/blueprint-compiler.git /var/lib/mock/f38-build-side-42-init-devel-889642-28528/root/chroot_tmpdir/scmroot/blueprint-compiler
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-889642-28528/root/chroot_tmpdir/scmroot/blueprint-compiler'...
$ git fetch origin bc73335594cbfd0d72b9fc7b3107aa4fe7fefe2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/blueprint-compiler
 * [new ref]         bc73335594cbfd0d72b9fc7b3107aa4fe7fefe2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc73335 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild