$ git clone -n https://src.fedoraproject.org/rpms/ghc-regex-pcre.git /var/lib/mock/f41-build-838075-159539/root/chroot_tmpdir/scmroot/ghc-regex-pcre
Cloning into '/var/lib/mock/f41-build-838075-159539/root/chroot_tmpdir/scmroot/ghc-regex-pcre'...
$ git fetch origin 290cdd2184bbe3e6e5f4d2cc5c7bd2a04e08a708:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-regex-pcre
 * [new ref]         290cdd2184bbe3e6e5f4d2cc5c7bd2a04e08a708 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 290cdd2 refresh .cabal revision