$ git clone -n https://src.fedoraproject.org/rpms/rust-imagequant-sys.git /var/lib/mock/f42-build-3231211-41191/root/chroot_tmpdir/scmroot/rust-imagequant-sys
Cloning into '/var/lib/mock/f42-build-3231211-41191/root/chroot_tmpdir/scmroot/rust-imagequant-sys'...
$ git fetch origin 6509824e78ccf1499b4919cf04f5caf3181ef425:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-imagequant-sys
 * [new ref]         6509824e78ccf1499b4919cf04f5caf3181ef425 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6509824 Rebuild for libimagequant