$ git clone -n https://src.fedoraproject.org/rpms/rubygem-slim.git /var/lib/mock/f40-build-2512588-61714/root/chroot_tmpdir/scmroot/rubygem-slim
Cloning into '/var/lib/mock/f40-build-2512588-61714/root/chroot_tmpdir/scmroot/rubygem-slim'...
$ git fetch origin 4e4097f1915afdc19c6415c187047ae09db00c35:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-slim
 * [new ref]         4e4097f1915afdc19c6415c187047ae09db00c35 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e4097f Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild