$ git clone -n https://src.fedoraproject.org/rpms/rust-tempfile.git /var/lib/mock/f40-build-2428444-60604/root/chroot_tmpdir/scmroot/rust-tempfile
Cloning into '/var/lib/mock/f40-build-2428444-60604/root/chroot_tmpdir/scmroot/rust-tempfile'...
$ git fetch origin 749d9907be365ce6611d33910645291786caea52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tempfile
 * [new ref]         749d9907be365ce6611d33910645291786caea52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 749d990 Update to version 3.10.0; Fixes RHBZ#2262852