$ git clone -n https://src.fedoraproject.org/rpms/rubygem-test-unit-rr.git /var/lib/mock/f39-build-1499426-34744/root/chroot_tmpdir/scmroot/rubygem-test-unit-rr
Cloning into '/var/lib/mock/f39-build-1499426-34744/root/chroot_tmpdir/scmroot/rubygem-test-unit-rr'...
$ git fetch origin 524d52896ad1b893e6f6e97d95796d306ea0b4d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-test-unit-rr
 * [new ref]         524d52896ad1b893e6f6e97d95796d306ea0b4d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 524d528 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild