$ git clone -n https://src.fedoraproject.org/rpms/ghc-th-reify-many.git /var/lib/mock/f38-build-side-42-init-devel-814196-28316/root/chroot_tmpdir/scmroot/ghc-th-reify-many
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-814196-28316/root/chroot_tmpdir/scmroot/ghc-th-reify-many'...
$ git fetch origin e8c813446143af44d413ac4d26a5edaaa65b127e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-th-reify-many
 * [new ref]         e8c813446143af44d413ac4d26a5edaaa65b127e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e8c8134 Convert to %autorelease and %autochangelog