$ git clone -n https://src.fedoraproject.org/rpms/ghc-haskell-gi-base.git /var/lib/mock/f40-build-2066292-49280/root/chroot_tmpdir/scmroot/ghc-haskell-gi-base
Cloning into '/var/lib/mock/f40-build-2066292-49280/root/chroot_tmpdir/scmroot/ghc-haskell-gi-base'...
$ git fetch origin db1019d910c0348292a11612f2104322b469e7d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-haskell-gi-base
 * [new ref]         db1019d910c0348292a11612f2104322b469e7d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db1019d https://hackage.haskell.org/package/haskell-gi-base-0.26.4/changelog