From b05671cdb5db0022db525cd374e52e58b7074bcb Mon Sep 17 00:00:00 2001
From: zimbatm <zimbatm@zimbatm.com>
Date: Tue, 7 Sep 2021 11:58:30 +0200
Subject: [PATCH 1/2] set cache-control on mutable objects

This allows to override the default TTL on Fastly. Let it know what
these objects should be refreshed more often.

Fixes NixOS/nixos-org-configurations#169
---
 mirror-nixos-branch.pl | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/mirror-nixos-branch.pl b/mirror-nixos-branch.pl
index ba355bd..0fbc734 100755
--- a/mirror-nixos-branch.pl
+++ b/mirror-nixos-branch.pl
@@ -330,11 +330,17 @@ if ($channelName =~ /20.03/ || $channelName =~ /19.09/) {
     run("git push channels $rev:refs/heads/$channelName >&2");
 }
 
+# s-maxage=600: Serve from cache for 5 minutes.
+# stale-while-revaliadate=1800: Serve from cache while updating in the background for 30 minutes.
+# https://web.dev/stale-while-revalidate/
+# https://developer.fastly.com/learning/concepts/cache-freshness/
+my $cache_control = "s-maxage=600,stale-while-revalidate=1800,public";
+
 sub redirect {
     my ($from, $to) = @_;
     $to = "https://releases.nixos.org/" . $to;
     print STDERR "redirect $from -> $to\n";
-    $bucketChannels->add_key($from, "", { "x-amz-website-redirect-location" => $to })
+    $bucketChannels->add_key($from, "", { "x-amz-website-redirect-location" => $to, "cache-control" => $cache_control })
         or die $bucketChannels->err . ": " . $bucketChannels->errstr;
 }
 

From 1a2b045d2c73d35890cfe8302fae2d6173ec7dab Mon Sep 17 00:00:00 2001
From: zimbatm <zimbatm@zimbatm.com>
Date: Wed, 8 Sep 2021 19:41:10 +0200
Subject: [PATCH 2/2] mirror-nixos-branch: stop pushing to nixpkgs-channels

The channel has been archived and doesn't take updates anymore.
---
 mirror-nixos-branch.pl | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/mirror-nixos-branch.pl b/mirror-nixos-branch.pl
index 0fbc734..f12aa3c 100755
--- a/mirror-nixos-branch.pl
+++ b/mirror-nixos-branch.pl
@@ -325,11 +325,6 @@ if ($dryRun) {
 run("git remote update origin >&2");
 run("git push origin $rev:refs/heads/$channelName >&2");
 
-# Also update the nixpkgs-channels repo for compatibility.
-if ($channelName =~ /20.03/ || $channelName =~ /19.09/) {
-    run("git push channels $rev:refs/heads/$channelName >&2");
-}
-
 # s-maxage=600: Serve from cache for 5 minutes.
 # stale-while-revaliadate=1800: Serve from cache while updating in the background for 30 minutes.
 # https://web.dev/stale-while-revalidate/