$ git clone -n https://src.fedoraproject.org/rpms/rubygem-activemodel-serializers-xml.git /var/lib/mock/f40-build-2114891-50675/root/chroot_tmpdir/scmroot/rubygem-activemodel-serializers-xml
Cloning into '/var/lib/mock/f40-build-2114891-50675/root/chroot_tmpdir/scmroot/rubygem-activemodel-serializers-xml'...
$ git fetch origin c759d2bee35499cf09c5bcc66c20e8d251d6210d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-activemodel-serializers-xml
 * [new ref]         c759d2bee35499cf09c5bcc66c20e8d251d6210d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c759d2b Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild