$ git clone -n https://src.fedoraproject.org/rpms/falkon.git /var/lib/mock/f42-build-58980630-6569521/root/chroot_tmpdir/scmroot/falkon
Cloning into '/var/lib/mock/f42-build-58980630-6569521/root/chroot_tmpdir/scmroot/falkon'...
$ git fetch origin 01e8f4651853c4e9b860332e432137f75017d271:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/falkon
 * [new ref]         01e8f4651853c4e9b860332e432137f75017d271 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01e8f46 Upstream fix for crash when creating bookmarks toolbar on startup (#2361191)