$ git clone -n https://src.fedoraproject.org/rpms/rust-rpick.git /var/lib/mock/f45-build-44490-814/root/chroot_tmpdir/scmroot/rust-rpick
Cloning into '/var/lib/mock/f45-build-44490-814/root/chroot_tmpdir/scmroot/rust-rpick'...
$ git fetch origin 53e0695a1a39a9785173e1bcd6b87ebc4d37d159:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rpick
 * [new ref]         53e0695a1a39a9785173e1bcd6b87ebc4d37d159 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53e0695 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild