$ git clone -n https://src.fedoraproject.org/rpms/rust-pear_codegen.git /var/lib/mock/f45-build-43694-805/root/chroot_tmpdir/scmroot/rust-pear_codegen
Cloning into '/var/lib/mock/f45-build-43694-805/root/chroot_tmpdir/scmroot/rust-pear_codegen'...
$ git fetch origin a09a9db199896c36240c36c48d82bed2f2eb1e04:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pear_codegen
 * [new ref]         a09a9db199896c36240c36c48d82bed2f2eb1e04 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a09a9db Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild