cmd/golink: run on Fly

And change /export to /_/export.

Updates #nnn

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

Makefile

@@ -0,0 +1,4 @@
+deploy:
+	./build.sh
+	flyctl deploy
+

build.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -e
+set -x
+
+export PATH="$PWD/../../tool":$PATH
+
+go run github.com/tailscale/mkctr \
+  --base="alpine:3.15" \
+  --gopaths="tailscale.io/cmd/golink:/tsgo" \
+  --tags="latest" \
+  --repos="registry.fly.io/tsgo" \
+  --push

fly.toml

@@ -0,0 +1,19 @@
+# Manually:
+#   $ fly scale count 1
+#   $ fly volumes create tsgo_data --region ord --size 1
+#   $ fly secrets set TS_AUTHKEY=....
+
+app = "tsgo"
+
+[build]
+image = "registry.fly.io/tsgo:latest"
+
+[experimental]
+cmd = ["/tsgo", "-verbose", "-linkdir=/root/linkdata", "-mkdir"]
+
+[deploy]
+strategy = "immediate"
+
+[mounts]
+source="tsgo_data"
+destination="/root"

golink.go

@@ -28,6 +28,7 @@ var (
 	verbose = flag.Bool("verbose", false, "be verbose")
 	linkDir = flag.String("linkdir", "", "the directory to store one JSON file per go/ shortlink")
 	dev     = flag.String("dev-listen", "", "if non-empty, listen on this addr and run in dev mode; auto-set linkDir if empty and don't use tsnet")
+	doMkdir = flag.Bool("mkdir", false, "whether to make --linkdir at start")
 )
 
 //go:embed link-snapshot.json
@@ -59,6 +60,13 @@ func main() {
 			log.Fatalf("--linkdir is required")
 		}
 	}
+
+	if *doMkdir {
+		if err := os.MkdirAll(*linkDir, 0755); err != nil {
+			log.Fatal(err)
+		}
+	}
+
 	if fi, err := os.Stat(*linkDir); err != nil {
 		log.Fatal(err)
 	} else if !fi.IsDir() {
@@ -136,7 +144,7 @@ func loadLink(short string) (*DiskLink, error) {
 }
 
 func serveGo(w http.ResponseWriter, r *http.Request) {
-	if r.RequestURI == "/export" {
+	if r.RequestURI == "/_/export" {
 		serveExport(w, r)
 		return
 	}

take-snapshot.sh

@@ -3,4 +3,4 @@
 set -e
 set -x
 
-curl -o $(dirname "$0")/link-snapshot.json http://go/export
+curl -o $(dirname "$0")/link-snapshot.json http://go/_/export