$ git clone -n https://src.fedoraproject.org/rpms/rust-inferno.git /var/lib/mock/f42-build-3231257-41191/root/chroot_tmpdir/scmroot/rust-inferno
Cloning into '/var/lib/mock/f42-build-3231257-41191/root/chroot_tmpdir/scmroot/rust-inferno'...
$ git fetch origin e4478a8db2c69ef3025729ce0f0f9520301c3780:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-inferno
 * [new ref]         e4478a8db2c69ef3025729ce0f0f9520301c3780 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4478a8 Update to version 0.12.1; Fixes RHBZ#2327290