$ git clone -n https://src.fedoraproject.org/rpms/rust-krates.git /var/lib/mock/f39-build-1921465-42955/root/chroot_tmpdir/scmroot/rust-krates
Cloning into '/var/lib/mock/f39-build-1921465-42955/root/chroot_tmpdir/scmroot/rust-krates'...
$ git fetch origin 32e62cb6df9e882bb6d17dc9571478a4b7ded33c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-krates
 * [new ref]         32e62cb6df9e882bb6d17dc9571478a4b7ded33c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 32e62cb Initial import (#2242762)