$ git clone -n https://src.fedoraproject.org/rpms/swing-layout.git /var/lib/mock/f41-build-1041894-18994/root/chroot_tmpdir/scmroot/swing-layout
Cloning into '/var/lib/mock/f41-build-1041894-18994/root/chroot_tmpdir/scmroot/swing-layout'...
$ git fetch origin 0ca1e36fad8b2e35213ab351ceace528b99fce44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/swing-layout
 * [new ref]         0ca1e36fad8b2e35213ab351ceace528b99fce44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0ca1e36 Eliminate use of obsolete %patchN syntax (#2283636)