$ git clone -n https://src.fedoraproject.org/rpms/rust-unescape.git /var/lib/mock/f42-build-3251790-41222/root/chroot_tmpdir/scmroot/rust-unescape
Cloning into '/var/lib/mock/f42-build-3251790-41222/root/chroot_tmpdir/scmroot/rust-unescape'...
$ git fetch origin f976567799a948efd59d565214efe15082eee229:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-unescape
 * [new ref]         f976567799a948efd59d565214efe15082eee229 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f976567 no longer needed