$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rdiscount.git /var/lib/mock/f40-build-733984-105632/root/chroot_tmpdir/scmroot/rubygem-rdiscount
Cloning into '/var/lib/mock/f40-build-733984-105632/root/chroot_tmpdir/scmroot/rubygem-rdiscount'...
$ git fetch origin 3fba44081ff42f94adc479271bb4c1df4aeab3c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rdiscount
 * [new ref]         3fba44081ff42f94adc479271bb4c1df4aeab3c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3fba440 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild