$ git clone -n https://src.fedoraproject.org/rpms/hostname.git /var/lib/mock/f42-build-867652-175685/root/chroot_tmpdir/scmroot/hostname
Cloning into '/var/lib/mock/f42-build-867652-175685/root/chroot_tmpdir/scmroot/hostname'...
$ git fetch origin 242cf0c79e7646246588a6a7ff5356559bc20ed4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/hostname
 * [new ref]         242cf0c79e7646246588a6a7ff5356559bc20ed4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 242cf0c Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild