$ git clone -n https://src.fedoraproject.org/rpms/rust-rxml.git /var/lib/mock/f38-build-side-43-rust-devel-1397136-31052/root/chroot_tmpdir/scmroot/rust-rxml
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1397136-31052/root/chroot_tmpdir/scmroot/rust-rxml'...
$ git fetch origin de8f9cb5db94bf7d136eecf4530096377ddc8004:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rxml
 * [new ref]         de8f9cb5db94bf7d136eecf4530096377ddc8004 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de8f9cb Update to version 0.9.1; Fixes RHBZ#2164389