[DO-NOT-MERGE] cmd/pkgsite: implement socket based activation

4 files changed, 26 insertions, 4 deletions

diff --git a/.gitignore b/.gitignore
index 17e5a31d..ee63b02a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@
 *.dll
 *.so
 *.dylib
+/pkgsite
 
 # Test binary, built with `go test -c`
 *.test
diff --git a/cmd/pkgsite/main.go b/cmd/pkgsite/main.go
index 49b99a59..eae690e0 100644
--- a/cmd/pkgsite/main.go
+++ b/cmd/pkgsite/main.go
@@ -60,6 +60,7 @@ import (
 	"strings"
 	"time"
 
+	"git.sr.ht/~shulhan/pakakeh.go/lib/systemd"
 	"golang.org/x/pkgsite/cmd/internal/pkgsite"
 	"golang.org/x/pkgsite/internal/browser"
 	"golang.org/x/pkgsite/internal/log"
@@ -133,10 +134,27 @@ func main() {
 		addr = ":http"
 	}
 
-	ln, err := net.Listen("tcp", addr)
+	var ln net.Listener
+	listeners, err := systemd.Listeners(true)
 	if err != nil {
 		dief("%s", err)
 	}
+	if len(listeners) > 1 {
+		dief(`too many listeners received for activation`)
+	}
+	if len(listeners) == 1 {
+		ln = listeners[0]
+		gotAddr := ln.Addr().String()
+		if gotAddr != addr {
+			dief(`invalid Listener address, got %s, want %s`,
+				gotAddr, addr)
+		}
+	} else {
+		ln, err = net.Listen("tcp", addr)
+		if err != nil {
+			dief("%s", err)
+		}
+	}
 
 	url := "http://" + addr
 	log.Infof(ctx, "Listening on addr %s", url)
diff --git a/go.mod b/go.mod
index 06de223b..e45152b3 100644
--- a/go.mod
+++ b/go.mod
@@ -12,13 +12,14 @@ require (
 	contrib.go.opencensus.io/exporter/prometheus v0.1.0
 	contrib.go.opencensus.io/exporter/stackdriver v0.13.4
 	contrib.go.opencensus.io/integrations/ocsql v0.1.4
+	git.sr.ht/~shulhan/pakakeh.go v0.60.3-0.20260202092811-1e3bb9be8444
 	github.com/Masterminds/squirrel v1.5.2
 	github.com/alicebob/miniredis/v2 v2.17.0
 	github.com/evanw/esbuild v0.17.8
 	github.com/go-redis/redis/v8 v8.11.4
 	github.com/go-redis/redis_rate/v9 v9.1.2
 	github.com/golang-migrate/migrate/v4 v4.15.1
-	github.com/google/go-cmp v0.6.0
+	github.com/google/go-cmp v0.7.0
 	github.com/google/go-replayers/httpreplay v1.0.0
 	github.com/google/licensecheck v0.3.1
 	github.com/google/safehtml v0.0.3-0.20211026203422-d6f0e11a5516
diff --git a/go.sum b/go.sum
index 5962f5ad..6de475e4 100644
--- a/go.sum
+++ b/go.sum
@@ -80,6 +80,8 @@ contrib.go.opencensus.io/integrations/ocsql v0.1.4 h1:kfg5Yyy1nYUrqzyfW5XX+dzMAS
 contrib.go.opencensus.io/integrations/ocsql v0.1.4/go.mod h1:8DsSdjz3F+APR+0z0WkU1aRorQCFfRxvqjUUPMbF3fE=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 gioui.org v0.0.0-20210308172011-57750fc8a0a6/go.mod h1:RSH6KIUZ0p2xy5zHDxgAM4zumjgTw83q2ge/PI+yyw8=
+git.sr.ht/~shulhan/pakakeh.go v0.60.3-0.20260202092811-1e3bb9be8444 h1:mqX+Z2dyfChpFOgt6gV9R5AT3oQN3pw4gMbPQLGm1DI=
+git.sr.ht/~shulhan/pakakeh.go v0.60.3-0.20260202092811-1e3bb9be8444/go.mod h1:1MkKXbLZRHTcnheeSEbRpGztkym4Yxzh90ep+jCxbDc=
 github.com/Azure/azure-pipeline-go v0.2.3/go.mod h1:x841ezTBIMG6O3lAcl8ATHnsOPVl2bqk7S3ta6S6u4k=
 github.com/Azure/azure-sdk-for-go v16.2.1+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
 github.com/Azure/azure-storage-blob-go v0.14.0/go.mod h1:SMqIBi+SuiQH32bvyjngEewEeXoPfKMgWlBDaYf6fck=
@@ -538,8 +540,8 @@ github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
+github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/go-github/v35 v35.2.0/go.mod h1:s0515YVTI+IMrDoy9Y4pHt9ShGpzHvHO8rZ7L7acgvs=
 github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/google/go-replayers/httpreplay v1.0.0 h1:8SmT8fUYM4nueF+UnXIX8LJxNTb1vpPuknXz+yTWzL4=