$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rack-test.git /var/lib/mock/f42-build-side-1-3584389-46893/root/chroot_tmpdir/scmroot/rubygem-rack-test
Cloning into '/var/lib/mock/f42-build-side-1-3584389-46893/root/chroot_tmpdir/scmroot/rubygem-rack-test'...
$ git fetch origin 020208d50594789955ed40d37b8f8f44980d9bd8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rack-test
 * [new ref]         020208d50594789955ed40d37b8f8f44980d9bd8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 020208d Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild