$ git clone -n https://src.fedoraproject.org/rpms/rust-pretty-hex.git /var/lib/mock/f45-build-43999-809/root/chroot_tmpdir/scmroot/rust-pretty-hex
Cloning into '/var/lib/mock/f45-build-43999-809/root/chroot_tmpdir/scmroot/rust-pretty-hex'...
$ git fetch origin 730f472e030aacd772b257554cdb7171f38e9deb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pretty-hex
 * [new ref]         730f472e030aacd772b257554cdb7171f38e9deb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 730f472 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild