$ git clone -n https://src.fedoraproject.org/rpms/rubygem-power_assert.git /var/lib/mock/f40-build-2205240-51993/root/chroot_tmpdir/scmroot/rubygem-power_assert
Cloning into '/var/lib/mock/f40-build-2205240-51993/root/chroot_tmpdir/scmroot/rubygem-power_assert'...
$ git fetch origin 0063b8024311bc735e278d3e373e6a22399c9666:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-power_assert
 * [new ref]         0063b8024311bc735e278d3e373e6a22399c9666 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0063b80 Remove byebug BR: it is not actually needed