$ git clone -n https://src.fedoraproject.org/rpms/ghc-regexpr.git /var/lib/mock/f38-build-side-42-init-devel-596384-26162/root/chroot_tmpdir/scmroot/ghc-regexpr
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-596384-26162/root/chroot_tmpdir/scmroot/ghc-regexpr'...
$ git fetch origin 35017ca595a65fb4a55913cff3df98d3727badd9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-regexpr
 * [new ref]         35017ca595a65fb4a55913cff3df98d3727badd9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35017ca Convert to %autorelease and %autochangelog