$ git clone -n https://src.fedoraproject.org/rpms/plasma-desktop.git /var/lib/mock/f39-build-1703943-41217/root/chroot_tmpdir/scmroot/plasma-desktop
Cloning into '/var/lib/mock/f39-build-1703943-41217/root/chroot_tmpdir/scmroot/plasma-desktop'...
$ git fetch origin f7e5c02614c440c4a5ce39f5dea6facafea0db0b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-desktop
 * [new ref]         f7e5c02614c440c4a5ce39f5dea6facafea0db0b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f7e5c02 5.27.9