$ git clone -n https://src.fedoraproject.org/rpms/ghc-integer-logarithms.git /var/lib/mock/f41-build-837633-159296/root/chroot_tmpdir/scmroot/ghc-integer-logarithms
Cloning into '/var/lib/mock/f41-build-837633-159296/root/chroot_tmpdir/scmroot/ghc-integer-logarithms'...
$ git fetch origin 37ba4cdbe96477f66e9f6c7fda880ea372879ebe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-integer-logarithms
 * [new ref]         37ba4cdbe96477f66e9f6c7fda880ea372879ebe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37ba4cd refresh .cabal revision