$ git clone -n https://src.fedoraproject.org/rpms/rust-string_cache.git /var/lib/mock/f45-build-45212-821/root/chroot_tmpdir/scmroot/rust-string_cache
Cloning into '/var/lib/mock/f45-build-45212-821/root/chroot_tmpdir/scmroot/rust-string_cache'...
$ git fetch origin 3c42d31a592e622d183e4e02d1e266ab22d4c3cc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-string_cache
 * [new ref]         3c42d31a592e622d183e4e02d1e266ab22d4c3cc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c42d31 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild