$ git clone -n https://src.fedoraproject.org/rpms/rust-pipe.git /var/lib/mock/f45-build-43868-807/root/chroot_tmpdir/scmroot/rust-pipe
Cloning into '/var/lib/mock/f45-build-43868-807/root/chroot_tmpdir/scmroot/rust-pipe'...
$ git fetch origin 2cde5bb0da01d5a938f67d9cc0202ae74cc2b551:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pipe
 * [new ref]         2cde5bb0da01d5a938f67d9cc0202ae74cc2b551 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2cde5bb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild