$ git clone -n https://src.fedoraproject.org/rpms/rust-quick-xml.git /var/lib/mock/f45-build-44186-811/root/chroot_tmpdir/scmroot/rust-quick-xml
Cloning into '/var/lib/mock/f45-build-44186-811/root/chroot_tmpdir/scmroot/rust-quick-xml'...
$ git fetch origin 4fb5c9a31c4f6e4d9fccb5f74ff083382bd611e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-quick-xml
 * [new ref]         4fb5c9a31c4f6e4d9fccb5f74ff083382bd611e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4fb5c9a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild