$ git clone -n https://src.fedoraproject.org/rpms/rust-dtoa-short.git /var/lib/mock/f45-build-41378-782/root/chroot_tmpdir/scmroot/rust-dtoa-short
Cloning into '/var/lib/mock/f45-build-41378-782/root/chroot_tmpdir/scmroot/rust-dtoa-short'...
$ git fetch origin f4caf2aae96a9fb1554394b411152b1acfde49bc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-dtoa-short
 * [new ref]         f4caf2aae96a9fb1554394b411152b1acfde49bc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f4caf2a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild