$ git clone -n https://src.fedoraproject.org/rpms/usbmuxd.git /var/lib/mock/f39-build-1558342-37303/root/chroot_tmpdir/scmroot/usbmuxd
Cloning into '/var/lib/mock/f39-build-1558342-37303/root/chroot_tmpdir/scmroot/usbmuxd'...
$ git fetch origin e2656b6333c2d4db201aaab0e4212d20238c14a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/usbmuxd
 * [new ref]         e2656b6333c2d4db201aaab0e4212d20238c14a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e2656b6 Update to git snapshot 61b99ab