$ git clone -n https://src.fedoraproject.org/rpms/falkon.git /var/lib/mock/f40-build-2236770-53519/root/chroot_tmpdir/scmroot/falkon
Cloning into '/var/lib/mock/f40-build-2236770-53519/root/chroot_tmpdir/scmroot/falkon'...
$ git fetch origin b244971cdee1ac171ea85f70bb10e6deac9fcb79:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/falkon
 * [new ref]         b244971cdee1ac171ea85f70bb10e6deac9fcb79 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b244971 24.01.90