$ git clone -n https://src.fedoraproject.org/rpms/rust-schemars0.8.git /var/lib/mock/f45-build-44707-816/root/chroot_tmpdir/scmroot/rust-schemars0.8
Cloning into '/var/lib/mock/f45-build-44707-816/root/chroot_tmpdir/scmroot/rust-schemars0.8'...
$ git fetch origin bfcafbbc17fc05ec66149c58fc71d94be1b9daaf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-schemars0.8
 * [new ref]         bfcafbbc17fc05ec66149c58fc71d94be1b9daaf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bfcafbb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild