$ git clone -n https://src.fedoraproject.org/rpms/rust-hkdf.git /var/lib/mock/f45-build-42356-793/root/chroot_tmpdir/scmroot/rust-hkdf
Cloning into '/var/lib/mock/f45-build-42356-793/root/chroot_tmpdir/scmroot/rust-hkdf'...
$ git fetch origin 631b5a9398fe3431edf47b5351b6994d41605812:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-hkdf
 * [new ref]         631b5a9398fe3431edf47b5351b6994d41605812 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 631b5a9 Update to version 0.13.0; Fixes RHBZ#2453041