$ git clone -n https://src.fedoraproject.org/rpms/kf6-knewstuff.git /var/lib/mock/f40-build-2544381-61897/root/chroot_tmpdir/scmroot/kf6-knewstuff
Cloning into '/var/lib/mock/f40-build-2544381-61897/root/chroot_tmpdir/scmroot/kf6-knewstuff'...
$ git fetch origin 2c3607b1ccf63cb0a94f3c0e01668376af2acba5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-knewstuff
 * [new ref]         2c3607b1ccf63cb0a94f3c0e01668376af2acba5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c3607b Backport patch to install popup