$ git clone -n https://src.fedoraproject.org/rpms/rust-mdbook-preprocessor.git /var/lib/mock/f45-build-43169-800/root/chroot_tmpdir/scmroot/rust-mdbook-preprocessor
Cloning into '/var/lib/mock/f45-build-43169-800/root/chroot_tmpdir/scmroot/rust-mdbook-preprocessor'...
$ git fetch origin b3aabaf399c4a6ab92b22eb93613b885470b3f42:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mdbook-preprocessor
 * [new ref]         b3aabaf399c4a6ab92b22eb93613b885470b3f42 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3aabaf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild