$ git clone -n https://src.fedoraproject.org/rpms/webkitgtk.git /var/lib/mock/f39-build-2174349-51066/root/chroot_tmpdir/scmroot/webkitgtk
Cloning into '/var/lib/mock/f39-build-2174349-51066/root/chroot_tmpdir/scmroot/webkitgtk'...
$ git fetch origin 4e6f2705ff71fd7a26b84990e3fbf3fb488647aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/webkitgtk
 * [new ref]         4e6f2705ff71fd7a26b84990e3fbf3fb488647aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e6f270 Update to 2.42.4