$ git clone -n https://src.fedoraproject.org/rpms/rust-imagequant-sys.git /var/lib/mock/f41-build-side-1-2992577-36014/root/chroot_tmpdir/scmroot/rust-imagequant-sys
Cloning into '/var/lib/mock/f41-build-side-1-2992577-36014/root/chroot_tmpdir/scmroot/rust-imagequant-sys'...
$ git fetch origin 21abdf46ad40652466f817d50877c5aea130b0d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-imagequant-sys
 * [new ref]         21abdf46ad40652466f817d50877c5aea130b0d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21abdf4 Rebuild for libimagequant