$ git clone -n https://src.fedoraproject.org/rpms/ghc-regexpr.git /var/lib/mock/f40-build-1998273-44226/root/chroot_tmpdir/scmroot/ghc-regexpr
Cloning into '/var/lib/mock/f40-build-1998273-44226/root/chroot_tmpdir/scmroot/ghc-regexpr'...
$ git fetch origin 2040c252d91a094e95952b8caadcc25752e1a1b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-regexpr
 * [new ref]         2040c252d91a094e95952b8caadcc25752e1a1b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2040c25 bump release