From 984d384d148090cdb0f6aa2f234a8b946c3b9ee3 Mon Sep 17 00:00:00 2001
From: Matthew Holt <mholt@users.noreply.github.com>
Date: Tue, 31 Dec 2019 16:47:35 -0700
Subject: Change storage paths to follow OS conventions; migrate folder (#2955)

---
 cmd/commandfuncs.go | 21 ++++++++++++++++
 cmd/main.go         | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 92 insertions(+)

(limited to 'cmd')

diff --git a/cmd/commandfuncs.go b/cmd/commandfuncs.go
index 6dc7c52..cc55df2 100644
--- a/cmd/commandfuncs.go
+++ b/cmd/commandfuncs.go
@@ -154,6 +154,8 @@ func cmdRun(fl Flags) (int, error) {
 	if err != nil {
 		return caddy.ExitCodeFailedStartup, err
 	}
+	// TODO: This is TEMPORARY, until the RCs
+	moveStorage()
 
 	// set a fitting User-Agent for ACME requests
 	goModule := caddy.GoModule()
@@ -190,6 +192,25 @@ func cmdRun(fl Flags) (int, error) {
 		}
 	}
 
+	// warn if the environment does not provide enough information about the disk
+	hasXDG := os.Getenv("XDG_DATA_HOME") != "" &&
+		os.Getenv("XDG_CONFIG_HOME") != "" &&
+		os.Getenv("XDG_CACHE_HOME") != ""
+	switch runtime.GOOS {
+	case "windows":
+		if os.Getenv("HOME") == "" && os.Getenv("USERPROFILE") == "" && !hasXDG {
+			caddy.Log().Warn("neither HOME nor USERPROFILE environment variables are set - please fix; some assets might be stored in ./caddy")
+		}
+	case "plan9":
+		if os.Getenv("home") == "" && !hasXDG {
+			caddy.Log().Warn("$home environment variable is empty - please fix; some assets might be stored in ./caddy")
+		}
+	default:
+		if os.Getenv("HOME") == "" && !hasXDG {
+			caddy.Log().Warn("$HOME environment variable is empty - please fix; some assets might be stored in ./caddy")
+		}
+	}
+
 	select {}
 }
 
diff --git a/cmd/main.go b/cmd/main.go
index a86c04a..ca9b914 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -22,12 +22,15 @@ import (
 	"io/ioutil"
 	"net"
 	"os"
+	"path/filepath"
+	"runtime"
 	"strconv"
 	"strings"
 	"time"
 
 	"github.com/caddyserver/caddy/v2"
 	"github.com/caddyserver/caddy/v2/caddyconfig"
+	"go.uber.org/zap"
 )
 
 // Main implements the main function of the caddy command.
@@ -226,3 +229,71 @@ func printEnvironment() {
 		fmt.Println(v)
 	}
 }
+
+// moveStorage moves the old default dataDir to the new default dataDir.
+// TODO: This is TEMPORARY until the release candidates.
+func moveStorage() {
+	// get the home directory (the old way)
+	oldHome := os.Getenv("HOME")
+	if oldHome == "" && runtime.GOOS == "windows" {
+		drive := os.Getenv("HOMEDRIVE")
+		path := os.Getenv("HOMEPATH")
+		oldHome = drive + path
+		if drive == "" || path == "" {
+			oldHome = os.Getenv("USERPROFILE")
+		}
+	}
+	if oldHome == "" {
+		oldHome = "."
+	}
+	oldDataDir := filepath.Join(oldHome, ".local", "share", "caddy")
+
+	// nothing to do if old data dir doesn't exist
+	_, err := os.Stat(oldDataDir)
+	if os.IsNotExist(err) {
+		return
+	}
+
+	// nothing to do if the new data dir is the same as the old one
+	newDataDir := caddy.AppDataDir()
+	if oldDataDir == newDataDir {
+		return
+	}
+
+	logger := caddy.Log().Named("automigrate").With(
+		zap.String("old_dir", oldDataDir),
+		zap.String("new_dir", newDataDir))
+
+	logger.Info("beginning one-time data directory migration",
+		zap.String("details", "https://github.com/caddyserver/caddy/issues/2955"))
+
+	// if new data directory exists, avoid auto-migration as a conservative safety measure
+	_, err = os.Stat(newDataDir)
+	if !os.IsNotExist(err) {
+		logger.Error("new data directory already exists; skipping auto-migration as conservative safety measure",
+			zap.Error(err),
+			zap.String("instructions", "https://github.com/caddyserver/caddy/issues/2955#issuecomment-570000333"))
+		return
+	}
+
+	// construct the new data directory's parent folder
+	err = os.MkdirAll(filepath.Dir(newDataDir), 0700)
+	if err != nil {
+		logger.Error("unable to make new datadirectory - follow link for instructions",
+			zap.String("instructions", "https://github.com/caddyserver/caddy/issues/2955#issuecomment-570000333"),
+			zap.Error(err))
+		return
+	}
+
+	// folder structure is same, so just try to rename (move) it;
+	// this fails if the new path is on a separate device
+	err = os.Rename(oldDataDir, newDataDir)
+	if err != nil {
+		logger.Error("new data directory already exists; skipping auto-migration as conservative safety measure - follow link for instructions",
+			zap.String("instructions", "https://github.com/caddyserver/caddy/issues/2955#issuecomment-570000333"),
+			zap.Error(err))
+	}
+
+	logger.Info("successfully completed one-time migration of data directory",
+		zap.String("details", "https://github.com/caddyserver/caddy/issues/2955"))
+}
-- 
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