$ git clone -n https://src.fedoraproject.org/rpms/rust-xml-rs.git /var/lib/mock/f42-build-61096197-6588810/root/chroot_tmpdir/scmroot/rust-xml-rs
Cloning into '/var/lib/mock/f42-build-61096197-6588810/root/chroot_tmpdir/scmroot/rust-xml-rs'...
$ git fetch origin 094049b9de5f03f4cd5c05f64e53418257db60ad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-xml-rs
 * [new ref]         094049b9de5f03f4cd5c05f64e53418257db60ad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 094049b Update to version 0.8.27; Fixes RHBZ#2379079