$ git clone -n https://src.fedoraproject.org/rpms/rust-proc-mounts.git /var/lib/mock/f45-build-44039-810/root/chroot_tmpdir/scmroot/rust-proc-mounts
Cloning into '/var/lib/mock/f45-build-44039-810/root/chroot_tmpdir/scmroot/rust-proc-mounts'...
$ git fetch origin 60e55b8feddbacd4e630b95036866a1b7046a863:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-proc-mounts
 * [new ref]         60e55b8feddbacd4e630b95036866a1b7046a863 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 60e55b8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild