fix(felis): PATH 缺 /usr/local/bin 时补上以找到 k3s

cmd/felis/main.go

@@ -6,8 +6,32 @@ package main
 
 import (
 	"os"
+	"path/filepath"
 )
 
 func main() {
+	ensureHostBinDirOnPath()
 	os.Exit(run(os.Args[1:], os.Stdout, os.Stderr))
 }
+
+// hostBinDir is where deploy/bootstrap.sh installs felis, k3s and cloudflared.
+const hostBinDir = "/usr/local/bin"
+
+// ensureHostBinDirOnPath appends hostBinDir to PATH when it is missing, so the
+// k3s and cloudflared this binary execs are found beside it. sudo's secure_path
+// on EL leaves /usr/local/bin out: `sudo /usr/local/bin/felis db backup` would
+// otherwise run with no k3s to reach the database's pod through. Appended, so a
+// PATH that names another k3s first keeps it.
+func ensureHostBinDirOnPath() {
+	path := os.Getenv("PATH")
+	for _, dir := range filepath.SplitList(path) {
+		if dir == hostBinDir {
+			return
+		}
+	}
+	if path == "" {
+		os.Setenv("PATH", hostBinDir)
+		return
+	}
+	os.Setenv("PATH", path+string(os.PathListSeparator)+hostBinDir)
+}