$ git clone -n https://src.fedoraproject.org/rpms/rust-quick-xml.git /var/lib/mock/f40-build-2101503-50506/root/chroot_tmpdir/scmroot/rust-quick-xml
Cloning into '/var/lib/mock/f40-build-2101503-50506/root/chroot_tmpdir/scmroot/rust-quick-xml'...
$ git fetch origin befa5c4fb09b3477447a89651e31da5544d080e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-quick-xml
 * [new ref]         befa5c4fb09b3477447a89651e31da5544d080e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at befa5c4 Update to version 0.31.0; Fixes RHBZ#2245734