$ git clone -n https://src.fedoraproject.org/rpms/rust-jwalk0.6.git /var/lib/mock/f40-build-2082584-49850/root/chroot_tmpdir/scmroot/rust-jwalk0.6
Cloning into '/var/lib/mock/f40-build-2082584-49850/root/chroot_tmpdir/scmroot/rust-jwalk0.6'...
$ git fetch origin eb38bbf65a442ac720e9f8fe4863d6dd1003a7a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-jwalk0.6
 * [new ref]         eb38bbf65a442ac720e9f8fe4863d6dd1003a7a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb38bbf Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild