$ git clone -n https://src.fedoraproject.org/rpms/rust-doctest-file.git /var/lib/mock/f45-build-41416-782/root/chroot_tmpdir/scmroot/rust-doctest-file
Cloning into '/var/lib/mock/f45-build-41416-782/root/chroot_tmpdir/scmroot/rust-doctest-file'...
$ git fetch origin f13b1b32b24c92a3d4c9484ff46ab4549267b2f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-doctest-file
 * [new ref]         f13b1b32b24c92a3d4c9484ff46ab4549267b2f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f13b1b3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild