$ git clone -n https://src.fedoraproject.org/rpms/rust-wide.git /var/lib/mock/f40-build-2040761-48382/root/chroot_tmpdir/scmroot/rust-wide
Cloning into '/var/lib/mock/f40-build-2040761-48382/root/chroot_tmpdir/scmroot/rust-wide'...
$ git fetch origin eac5daf6b78bfdf209d964c4def210bd2c702fd8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-wide
 * [new ref]         eac5daf6b78bfdf209d964c4def210bd2c702fd8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eac5daf Update to version 0.7.13; Fixes RHBZ#2244598