$ git clone -n https://src.fedoraproject.org/rpms/libmatemixer.git /var/lib/mock/f39-build-1457927-33025/root/chroot_tmpdir/scmroot/libmatemixer
Cloning into '/var/lib/mock/f39-build-1457927-33025/root/chroot_tmpdir/scmroot/libmatemixer'...
$ git fetch origin 986587b2a0481a2ed6faf6367f3d3652c995951b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmatemixer
 * [new ref]         986587b2a0481a2ed6faf6367f3d3652c995951b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 986587b update to 1.26.1