From acc1630460169f3944143da8a7ad8819f808487d Mon Sep 17 00:00:00 2001
From: Maxim Vladimirskiy <horkhe@gmail.com>
Date: Wed, 5 Sep 2018 11:21:53 +0300
Subject: [PATCH] Do not assume TLC cert files location

---
 etcdutil/config.go   | 52 ++++++++++++++++++--------------------------
 etcdutil/election.go |  2 +-
 version              |  2 +-
 3 files changed, 23 insertions(+), 33 deletions(-)

diff --git a/etcdutil/config.go b/etcdutil/config.go
index 4f2bc0d6..ad9b9894 100644
--- a/etcdutil/config.go
+++ b/etcdutil/config.go
@@ -15,9 +15,6 @@ import (
 )
 
 const (
-	pathToCA          = "/etc/mailgun/ssl/localhost/ca.pem"
-	pathToKey         = "/etc/mailgun/ssl/localhost/etcd-key.pem"
-	pathToCert        = "/etc/mailgun/ssl/localhost/etcd-cert.pem"
 	localEtcdEndpoint = "127.0.0.1:2379"
 )
 
@@ -28,9 +25,14 @@ func init() {
 	}
 }
 
-func NewSecureClient(cfg *etcd.Config) (*etcd.Client, error) {
+// NewClient creates a new etcd.Client with the specified config where blanks
+// are filled from environment variables by NewConfig.
+//
+// If the provided config is nil and no environment variables are set, it will
+// return a client connecting without TLS via localhost:2379.
+func NewClient(cfg *etcd.Config) (*etcd.Client, error) {
 	var err error
-	if cfg, err = NewEtcdConfig(cfg); err != nil {
+	if cfg, err = NewConfig(cfg); err != nil {
 		return nil, errors.Wrap(err, "failed to build etcd config")
 	}
 
@@ -41,25 +43,21 @@ func NewSecureClient(cfg *etcd.Config) (*etcd.Client, error) {
 	return etcdClt, nil
 }
 
-// Create a new etcd.Config using environment variables. If an existing
-// config is passed, will fill in missing configuration using environment
-// variables or defaults if they exists on the local system.
+// NewConfig creates a new etcd.Config using environment variables. If an
+// existing config is passed, it will fill in missing configuration using
+// environment variables or defaults if they exists on the local system.
+//
+// If no environment variables are set, it will return a config set to
+// connect without TLS via localhost:2379.
+func NewConfig(cfg *etcd.Config) (*etcd.Config, error) {
+	var envEndpoint, tlsCertFile, tlsKeyFile, tlsCAFile string
 
-// If no environment variables are set, will return a config set to
-// connect without TLS via localhost:2379
-func NewEtcdConfig(cfg *etcd.Config) (*etcd.Config, error) {
-	var envEndpoint, tlsCertFile, tlsKeyFile, tlsCaFile string
-
-	// Create a config if none exists and get user/pass
 	holster.SetDefault(&cfg, &etcd.Config{})
 	holster.SetDefault(&cfg.Username, os.Getenv("ETCD3_USER"))
 	holster.SetDefault(&cfg.Password, os.Getenv("ETCD3_PASSWORD"))
-
-	// Don't set default file locations for these if they don't exist on disk
-	// as dev or testing environments might not have certificates
-	holster.SetDefault(&tlsCertFile, os.Getenv("ETCD3_TLS_CERT"), ifExists(pathToCert))
-	holster.SetDefault(&tlsKeyFile, os.Getenv("ETCD3_TLS_KEY"), ifExists(pathToKey))
-	holster.SetDefault(&tlsCaFile, os.Getenv("ETCD3_CA"), ifExists(pathToCA))
+	holster.SetDefault(&tlsCertFile, os.Getenv("ETCD3_TLS_CERT"))
+	holster.SetDefault(&tlsKeyFile, os.Getenv("ETCD3_TLS_KEY"))
+	holster.SetDefault(&tlsCAFile, os.Getenv("ETCD3_CA"))
 
 	// Default to 5 second timeout, else connections hang indefinitely
 	holster.SetDefault(&cfg.DialTimeout, time.Second*5)
@@ -74,15 +72,15 @@ func NewEtcdConfig(cfg *etcd.Config) (*etcd.Config, error) {
 	}
 
 	// If the CA file was provided
-	if tlsCaFile != "" {
+	if tlsCAFile != "" {
 		holster.SetDefault(&cfg.TLS, &tls.Config{})
 
 		var certPool *x509.CertPool = nil
-		if pemBytes, err := ioutil.ReadFile(tlsCaFile); err == nil {
+		if pemBytes, err := ioutil.ReadFile(tlsCAFile); err == nil {
 			certPool = x509.NewCertPool()
 			certPool.AppendCertsFromPEM(pemBytes)
 		} else {
-			return nil, errors.Errorf("while loading cert CA file '%s': %s", tlsCaFile, err)
+			return nil, errors.Errorf("while loading cert CA file '%s': %s", tlsCAFile, err)
 		}
 		holster.SetDefault(&cfg.TLS.RootCAs, certPool)
 		cfg.TLS.InsecureSkipVerify = false
@@ -116,11 +114,3 @@ func NewEtcdConfig(cfg *etcd.Config) (*etcd.Config, error) {
 
 	return cfg, nil
 }
-
-// If the file exists, return the path provided
-func ifExists(file string) string {
-	if _, err := os.Stat(file); err == nil {
-		return file
-	}
-	return ""
-}
diff --git a/etcdutil/election.go b/etcdutil/election.go
index 719646f0..64884429 100644
--- a/etcdutil/election.go
+++ b/etcdutil/election.go
@@ -73,7 +73,7 @@ func NewElection(election, candidate string, etcdConfig *etcd.Config) (*Election
 	e.Election = path.Join("/elections", e.Election)
 
 	var err error
-	e.etcdConfig, err = NewEtcdConfig(etcdConfig)
+	e.etcdConfig, err = NewConfig(etcdConfig)
 	if err != nil {
 		return nil, err
 	}
diff --git a/version b/version
index a7ee35a3..f8e233b2 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-1.8.3
+1.9.0