$ git clone -n https://src.fedoraproject.org/rpms/plasma-welcome.git /var/lib/mock/f39-build-1642992-40224/root/chroot_tmpdir/scmroot/plasma-welcome
Cloning into '/var/lib/mock/f39-build-1642992-40224/root/chroot_tmpdir/scmroot/plasma-welcome'...
$ git fetch origin 39565cce4b01b97052e60457275286b4e9966257:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-welcome
 * [new ref]         39565cce4b01b97052e60457275286b4e9966257 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39565cc 5.27.9