$ git clone -n https://src.fedoraproject.org/rpms/rust-widestring.git /var/lib/mock/f45-build-46238-832/root/chroot_tmpdir/scmroot/rust-widestring
Cloning into '/var/lib/mock/f45-build-46238-832/root/chroot_tmpdir/scmroot/rust-widestring'...
$ git fetch origin a3be45193eb21841d49431d59ebca3530e77166e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-widestring
 * [new ref]         a3be45193eb21841d49431d59ebca3530e77166e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3be451 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild