$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_ignored.git /var/lib/mock/f40-build-2039487-48275/root/chroot_tmpdir/scmroot/rust-serde_ignored
Cloning into '/var/lib/mock/f40-build-2039487-48275/root/chroot_tmpdir/scmroot/rust-serde_ignored'...
$ git fetch origin e10476bcc38a6783859cb74656ab42248485b626:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_ignored
 * [new ref]         e10476bcc38a6783859cb74656ab42248485b626 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e10476b Update to version 0.1.9; Fixes RHBZ#2223142