$ git clone -n https://src.fedoraproject.org/rpms/rust-mdbook-html.git /var/lib/mock/f45-build-43173-800/root/chroot_tmpdir/scmroot/rust-mdbook-html
Cloning into '/var/lib/mock/f45-build-43173-800/root/chroot_tmpdir/scmroot/rust-mdbook-html'...
$ git fetch origin 62b0c2b3c396c5d8647a13520299d82e42fb3483:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mdbook-html
 * [new ref]         62b0c2b3c396c5d8647a13520299d82e42fb3483 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62b0c2b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild