$ git clone -n https://src.fedoraproject.org/rpms/rust-blazesym-c.git /var/lib/mock/f42-build-side-1-3585834-46908/root/chroot_tmpdir/scmroot/rust-blazesym-c
Cloning into '/var/lib/mock/f42-build-side-1-3585834-46908/root/chroot_tmpdir/scmroot/rust-blazesym-c'...
$ git fetch origin 91df331f692d235529ee79810c21ab03506560c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-blazesym-c
 * [new ref]         91df331f692d235529ee79810c21ab03506560c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91df331 Allow which 8