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fastly: implement "Lockable HTTP Tarball Protocol" (Flakes) for channels.nixos.org #562

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Merged
Mic92 merged 1 commit into from
Feb 24, 2025
Merged

fastly: implement "Lockable HTTP Tarball Protocol" (Flakes) for channels.nixos.org #562

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13 changes: 13 additions & 0 deletions terraform/channels.tf
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Original file line number Diff line number Diff line change
Expand Up @@ -229,11 +229,24 @@ resource "fastly_service_vcl" "channels" {
# Note: we need to match on 301s and 302s here, since Fastly has multiple
# layers, and otherwise a redirect might still get cached at the second
# layer after the first layer turned a 301 into a 302.
#
# Additionally, this also implements the "Lockable HTTP Tarball Protocol"
# to use nixexprs.tar.xz with Flakes and have it locked properly.
if (beresp.status == 301 || beresp.status == 302) {
set beresp.status = 302;
set beresp.ttl = 0s;
set beresp.grace = 0s;
set beresp.cacheable = false;
if (req.backend.is_origin && std.suffixof(bereq.url, "/nixexprs.tar.xz")) {
# rename prepared link header if available
if (beresp.http.x-amz-meta-link) {
set beresp.http.link = beresp.http.x-amz-meta-link;
unset beresp.http.x-amz-meta-link;
# otherwise, use fallback that contains no flake attributes (e.g. rev)
} else {
set beresp.http.link = "<" + beresp.http.location + {">; rel="immutable""};
}
}
return (pass);
}
EOT
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