$ git clone -n https://src.fedoraproject.org/rpms/perl-IO-Prompter.git /var/lib/mock/f40-build-2018189-46390/root/chroot_tmpdir/scmroot/perl-IO-Prompter
Cloning into '/var/lib/mock/f40-build-2018189-46390/root/chroot_tmpdir/scmroot/perl-IO-Prompter'...
$ git fetch origin 5114caf352b0222892a8dac9b3978f1b79e59cb0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IO-Prompter
 * [new ref]         5114caf352b0222892a8dac9b3978f1b79e59cb0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5114caf New upstream release