$ git clone -n https://src.fedoraproject.org/rpms/rust-target-lexicon.git /var/lib/mock/f40-build-2260657-54416/root/chroot_tmpdir/scmroot/rust-target-lexicon
Cloning into '/var/lib/mock/f40-build-2260657-54416/root/chroot_tmpdir/scmroot/rust-target-lexicon'...
$ git fetch origin 7fbeb2c629c3012f24e98828c413fbbf5d4268d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-target-lexicon
 * [new ref]         7fbeb2c629c3012f24e98828c413fbbf5d4268d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7fbeb2c Update to version 0.12.13; Fixes RHBZ#2256546