move python packages to pkgs/python-packages

Remove obsolete passthru from joinmarket because joinmarket packages are
now accessible via pkgs/python-packages.

pkgs/python-packages/python-bitcointx/get-sha256.sh

@@ -0,0 +1,24 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -i bash -p git gnupg
+set -euo pipefail
+
+TMPDIR="$(mktemp -d -p /tmp)"
+trap "rm -rf $TMPDIR" EXIT
+cd $TMPDIR
+
+echo "Fetching latest release"
+git clone https://github.com/simplexum/python-bitcointx 2> /dev/null
+cd python-bitcointx
+latest=python-bitcointx-v1.1.1.post0
+echo "Latest release is ${latest}"
+
+# GPG verification
+export GNUPGHOME=$TMPDIR
+echo "Fetching Dimitry Pethukov's Key"
+gpg --keyserver hkps://keyserver.ubuntu.com --recv-keys B17A35BBA187395784E2A6B32301D26BDC15160D 2> /dev/null
+echo "Verifying latest release"
+git verify-commit ${latest}
+
+echo "tag: ${latest}"
+# The prefix option is necessary because GitHub prefixes the archive contents in this format
+echo "sha256: $(git archive --format tar.gz --prefix=python-bitcointx-"${latest}"/ ${latest} | sha256sum | cut -d\  -f1)"