$ git clone -n https://src.fedoraproject.org/rpms/picom.git /var/lib/mock/f41-build-side-1-2753443-31224/root/chroot_tmpdir/scmroot/picom
Cloning into '/var/lib/mock/f41-build-side-1-2753443-31224/root/chroot_tmpdir/scmroot/picom'...
$ git fetch origin 6fb73f26c79ef0b0268fd131ac89f460b52df952:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/picom
 * [new ref]         6fb73f26c79ef0b0268fd131ac89f460b52df952 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fb73f2 build: Drop i686 arch