$ git clone -n https://src.fedoraproject.org/rpms/rubygem-em-http-request.git /var/lib/mock/f38-build-side-42-init-devel-716722-27296/root/chroot_tmpdir/scmroot/rubygem-em-http-request
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-716722-27296/root/chroot_tmpdir/scmroot/rubygem-em-http-request'...
$ git fetch origin e4338efa20197deaf34dfa401bd16b775584bacc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-em-http-request
 * [new ref]         e4338efa20197deaf34dfa401bd16b775584bacc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4338ef Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild