$ git clone -n https://src.fedoraproject.org/rpms/rust-chrono.git /var/lib/mock/f40-build-2389656-60523/root/chroot_tmpdir/scmroot/rust-chrono
Cloning into '/var/lib/mock/f40-build-2389656-60523/root/chroot_tmpdir/scmroot/rust-chrono'...
$ git fetch origin 2f3b2f07b1f9cb09a0693a62e8b344b8cef371d2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-chrono
 * [new ref]         2f3b2f07b1f9cb09a0693a62e8b344b8cef371d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f3b2f0 Update to version 0.4.33; Fixes RHBZ#2259728