$ git clone -n https://src.fedoraproject.org/rpms/alsa-lib.git /var/lib/mock/f42-build-side-1-3584229-46892/root/chroot_tmpdir/scmroot/alsa-lib
Cloning into '/var/lib/mock/f42-build-side-1-3584229-46892/root/chroot_tmpdir/scmroot/alsa-lib'...
$ git fetch origin 8f12f0bec5928857300336058073ed41b10b9a03:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alsa-lib
 * [new ref]         8f12f0bec5928857300336058073ed41b10b9a03 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f12f0b update alsa-ucm-conf files to latest