From 04990cdb8501c6410fd870b120e02d11ada6e579 Mon Sep 17 00:00:00 2001
From: Samuel Ainsworth <skainsworth@gmail.com>
Date: Tue, 3 Nov 2020 18:38:30 -0800
Subject: [PATCH 1/3] slack: refactor to be amenable to auto-updates

---
 .../instant-messengers/slack/default.nix          | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/pkgs/applications/networking/instant-messengers/slack/default.nix b/pkgs/applications/networking/instant-messengers/slack/default.nix
index bd41fc562bfc..6b2c2875e3ec 100644
--- a/pkgs/applications/networking/instant-messengers/slack/default.nix
+++ b/pkgs/applications/networking/instant-messengers/slack/default.nix
@@ -39,9 +39,16 @@ let
   throwSystem = throw "Unsupported system: ${system}";
 
   pname = "slack";
+
+  x86_64-darwin-version = "4.10.3";
+  x86_64-darwin-sha256 = "0r77l57vr603xamich4h4gbdd5vdcj0sjs6yjpymfx9s0f98v8bb";
+
+  x86_64-linux-version = "4.10.3";
+  x86_64-linux-sha256 = "1gnjj2iyk8cwjajg8h9qpmzx10j4qjxjzciq8csg45qfzwkr3drf";
+
   version = {
-    x86_64-darwin = "4.10.3";
-    x86_64-linux = "4.10.3";
+    x86_64-darwin = x86_64-darwin-version;
+    x86_64-linux = x86_64-linux-version;
   }.${system} or throwSystem;
 
   src = let
@@ -49,11 +56,11 @@ let
   in {
     x86_64-darwin = fetchurl {
       url = "${base}/releases/macos/${version}/prod/x64/Slack-${version}-macOS.dmg";
-      sha256 = "0r77l57vr603xamich4h4gbdd5vdcj0sjs6yjpymfx9s0f98v8bb";
+      sha256 = x86_64-darwin-sha256;
     };
     x86_64-linux = fetchurl {
       url = "${base}/linux_releases/slack-desktop-${version}-amd64.deb";
-      sha256 = "1gnjj2iyk8cwjajg8h9qpmzx10j4qjxjzciq8csg45qfzwkr3drf";
+      sha256 = x86_64-linux-sha256;
     };
   }.${system} or throwSystem;
 

From f0fc6961fd5c9603c43b553628d36488708949fe Mon Sep 17 00:00:00 2001
From: Samuel Ainsworth <skainsworth@gmail.com>
Date: Tue, 3 Nov 2020 18:38:44 -0800
Subject: [PATCH 2/3] slack: add auto-updater script

---
 .../instant-messengers/slack/update.sh        | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100755 pkgs/applications/networking/instant-messengers/slack/update.sh

diff --git a/pkgs/applications/networking/instant-messengers/slack/update.sh b/pkgs/applications/networking/instant-messengers/slack/update.sh
new file mode 100755
index 000000000000..adef44411091
--- /dev/null
+++ b/pkgs/applications/networking/instant-messengers/slack/update.sh
@@ -0,0 +1,41 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -i bash -p curl gnused
+
+set -eou pipefail
+
+latest_linux_version=$(curl --silent https://slack.com/downloads/linux | sed -n 's/.*Version \([0-9\.]\+\).*/\1/p')
+latest_mac_version=$(curl --silent https://slack.com/downloads/mac | sed -n 's/.*Version \([0-9\.]\+\).*/\1/p')
+
+# Double check that the latest mac and linux versions are in sync.
+if [[ "$latest_linux_version" != "$latest_mac_version" ]]; then
+  echo "the latest linux ($latest_linux_version) and mac ($latest_mac_version) versions are not the same"
+  exit 1
+fi
+
+nixpkgs="$(git rev-parse --show-toplevel)"
+slack_nix="$nixpkgs/pkgs/applications/networking/instant-messengers/slack/default.nix"
+nixpkgs_linux_version=$(cat "$slack_nix" | sed -n 's/.*x86_64-linux-version = \"\([0-9\.]\+\)\";.*/\1/p')
+nixpkgs_mac_version=$(cat "$slack_nix" | sed -n 's/.*x86_64-darwin-version = \"\([0-9\.]\+\)\";.*/\1/p')
+
+if [[ "$nixpkgs_linux_version" == "$latest_linux_version" && "$nixpkgs_mac_version" == "$latest_mac_version" ]]; then
+  echo "nixpkgs versions are all up to date!"
+  exit 0
+fi
+
+linux_url="https://downloads.slack-edge.com/linux_releases/slack-desktop-${latest_linux_version}-amd64.deb"
+mac_url="https://downloads.slack-edge.com/releases/macos/${latest_mac_version}/prod/x64/Slack-${latest_mac_version}-macOS.dmg"
+linux_sha256=$(nix-prefetch-url ${linux_url})
+mac_sha256=$(nix-prefetch-url ${mac_url})
+
+sed -i "s/x86_64-linux-version = \".*\"/x86_64-linux-version = \"${latest_linux_version}\"/" "$slack_nix"
+sed -i "s/x86_64-darwin-version = \".*\"/x86_64-darwin-version = \"${latest_mac_version}\"/" "$slack_nix"
+sed -i "s/x86_64-linux-sha256 = \".*\"/x86_64-linux-sha256 = \"${linux_sha256}\"/" "$slack_nix"
+sed -i "s/x86_64-darwin-sha256 = \".*\"/x86_64-darwin-sha256 = \"${mac_sha256}\"/" "$slack_nix"
+
+if ! nix-build -A slack "$nixpkgs"; then
+  echo "The updated slack failed to build."
+  exit 1
+fi
+
+echo "Successfully updated"
+echo "slack: $nixpkgs_linux_version -> $latest_linux_version"

From 3037318511eccef339099704773564ee2b1bffe1 Mon Sep 17 00:00:00 2001
From: Samuel Ainsworth <skainsworth@gmail.com>
Date: Wed, 4 Nov 2020 16:12:36 -0800
Subject: [PATCH 3/3] slack: add passthru.updateScript

---
 .../networking/instant-messengers/slack/default.nix           | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/applications/networking/instant-messengers/slack/default.nix b/pkgs/applications/networking/instant-messengers/slack/default.nix
index 6b2c2875e3ec..d27bd6a521de 100644
--- a/pkgs/applications/networking/instant-messengers/slack/default.nix
+++ b/pkgs/applications/networking/instant-messengers/slack/default.nix
@@ -75,6 +75,8 @@ let
   linux = stdenv.mkDerivation rec {
     inherit pname version src meta;
 
+    passthru.updateScript = ./update.sh;
+
     rpath = stdenv.lib.makeLibraryPath [
       alsaLib
       at-spi2-atk
@@ -159,6 +161,8 @@ let
   darwin = stdenv.mkDerivation {
     inherit pname version src meta;
 
+    passthru.updateScript = ./update.sh;
+
     nativeBuildInputs = [ undmg ];
 
     sourceRoot = "Slack.app";