$ git clone -n https://src.fedoraproject.org/rpms/rust-castaway.git /var/lib/mock/f38-build-side-42-init-devel-688826-26788/root/chroot_tmpdir/scmroot/rust-castaway
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-688826-26788/root/chroot_tmpdir/scmroot/rust-castaway'...
$ git fetch origin 26842b55c71cf72b1f89eb95a39e9a28a880f1ca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-castaway
 * [new ref]         26842b55c71cf72b1f89eb95a39e9a28a880f1ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26842b5 Initial import (rhbz#2182474).