feat: adds a post hook.

cmd/root.go

@@ -61,6 +61,7 @@ func init() {
 	rootCmd.PersistentFlags().Bool("domain-subdir", false, "Use domain as sub-directory.")
 	rootCmd.PersistentFlags().Bool("clean", true, "Clean destination folder before dumping content.")
 	rootCmd.PersistentFlags().Bool("watch", false, "Enable watching changes.")
+	rootCmd.PersistentFlags().String("post-hook", "", "Execute a command only if changes occurs on the data source. (works only with the watch mode)")
 }
 
 // initConfig reads in config file and ENV variables if set.
@@ -174,5 +175,6 @@ func getBaseConfig(cmd *cobra.Command) (*dumper.BaseConfig, error) {
 		DomainSubDir: subDir,
 		Clean:        clean,
 		Watch:        watch,
+		Hook:         cmd.Flag("post-hook").Value.String(),
 	}, nil
 }

docs/traefik-certs-dumper.md

@@ -18,6 +18,7 @@ Dump Let's Encrypt certificates from Traefik.
   -h, --help               help for traefik-certs-dumper
       --key-ext string     The file extension of the generated private keys. (default ".key")
       --key-name string    The file name (without extension) of the generated private keys. (default "privatekey")
+      --post-hook string   Execute a command only if changes occurs on the data source. (works only with the watch mode)
       --watch              Enable watching changes.
 ```
 
@@ -27,4 +28,4 @@ Dump Let's Encrypt certificates from Traefik.
 * [traefik-certs-dumper kv](traefik-certs-dumper_kv.md)	 - Dump the content of a KV store.
 * [traefik-certs-dumper version](traefik-certs-dumper_version.md)	 - Display version
 
-###### Auto generated by spf13/cobra on 22-Apr-2019
+###### Auto generated by spf13/cobra on 25-Apr-2019

docs/traefik-certs-dumper_file.md

@@ -28,6 +28,7 @@ traefik-certs-dumper file [flags]
       --domain-subdir      Use domain as sub-directory.
       --key-ext string     The file extension of the generated private keys. (default ".key")
       --key-name string    The file name (without extension) of the generated private keys. (default "privatekey")
+      --post-hook string   Execute a command only if changes occurs on the data source. (works only with the watch mode)
       --watch              Enable watching changes.
 ```
 
@@ -35,4 +36,4 @@ traefik-certs-dumper file [flags]
 
 * [traefik-certs-dumper](traefik-certs-dumper.md)	 - Dump Let's Encrypt certificates from Traefik.
 
-###### Auto generated by spf13/cobra on 22-Apr-2019
+###### Auto generated by spf13/cobra on 25-Apr-2019

docs/traefik-certs-dumper_kv.md

@@ -34,6 +34,7 @@ Dump the content of a KV store.
       --domain-subdir      Use domain as sub-directory.
       --key-ext string     The file extension of the generated private keys. (default ".key")
       --key-name string    The file name (without extension) of the generated private keys. (default "privatekey")
+      --post-hook string   Execute a command only if changes occurs on the data source. (works only with the watch mode)
       --watch              Enable watching changes.
 ```
 
@@ -45,4 +46,4 @@ Dump the content of a KV store.
 * [traefik-certs-dumper kv etcd](traefik-certs-dumper_kv_etcd.md)	 - Dump the content of etcd.
 * [traefik-certs-dumper kv zookeeper](traefik-certs-dumper_kv_zookeeper.md)	 - Dump the content of zookeeper.
 
-###### Auto generated by spf13/cobra on 22-Apr-2019
+###### Auto generated by spf13/cobra on 25-Apr-2019

docs/traefik-certs-dumper_kv_boltdb.md

@@ -32,6 +32,7 @@ traefik-certs-dumper kv boltdb [flags]
       --key-ext string           The file extension of the generated private keys. (default ".key")
       --key-name string          The file name (without extension) of the generated private keys. (default "privatekey")
       --password string          Password for connection.
+      --post-hook string         Execute a command only if changes occurs on the data source. (works only with the watch mode)
       --prefix string            Prefix used for KV store. (default "traefik")
       --tls                      Enable TLS encryption.
       --tls.ca string            Root CA for certificate verification if TLS is enabled
@@ -47,4 +48,4 @@ traefik-certs-dumper kv boltdb [flags]
 
 * [traefik-certs-dumper kv](traefik-certs-dumper_kv.md)	 - Dump the content of a KV store.
 
-###### Auto generated by spf13/cobra on 22-Apr-2019
+###### Auto generated by spf13/cobra on 25-Apr-2019

docs/traefik-certs-dumper_kv_consul.md

@@ -31,6 +31,7 @@ traefik-certs-dumper kv consul [flags]
       --key-ext string           The file extension of the generated private keys. (default ".key")
       --key-name string          The file name (without extension) of the generated private keys. (default "privatekey")
       --password string          Password for connection.
+      --post-hook string         Execute a command only if changes occurs on the data source. (works only with the watch mode)
       --prefix string            Prefix used for KV store. (default "traefik")
       --tls                      Enable TLS encryption.
       --tls.ca string            Root CA for certificate verification if TLS is enabled
@@ -46,4 +47,4 @@ traefik-certs-dumper kv consul [flags]
 
 * [traefik-certs-dumper kv](traefik-certs-dumper_kv.md)	 - Dump the content of a KV store.
 
-###### Auto generated by spf13/cobra on 22-Apr-2019
+###### Auto generated by spf13/cobra on 25-Apr-2019

docs/traefik-certs-dumper_kv_etcd.md

@@ -31,6 +31,7 @@ traefik-certs-dumper kv etcd [flags]
       --key-ext string           The file extension of the generated private keys. (default ".key")
       --key-name string          The file name (without extension) of the generated private keys. (default "privatekey")
       --password string          Password for connection.
+      --post-hook string         Execute a command only if changes occurs on the data source. (works only with the watch mode)
       --prefix string            Prefix used for KV store. (default "traefik")
       --tls                      Enable TLS encryption.
       --tls.ca string            Root CA for certificate verification if TLS is enabled
@@ -46,4 +47,4 @@ traefik-certs-dumper kv etcd [flags]
 
 * [traefik-certs-dumper kv](traefik-certs-dumper_kv.md)	 - Dump the content of a KV store.
 
-###### Auto generated by spf13/cobra on 22-Apr-2019
+###### Auto generated by spf13/cobra on 25-Apr-2019

docs/traefik-certs-dumper_kv_zookeeper.md

@@ -30,6 +30,7 @@ traefik-certs-dumper kv zookeeper [flags]
       --key-ext string           The file extension of the generated private keys. (default ".key")
       --key-name string          The file name (without extension) of the generated private keys. (default "privatekey")
       --password string          Password for connection.
+      --post-hook string         Execute a command only if changes occurs on the data source. (works only with the watch mode)
       --prefix string            Prefix used for KV store. (default "traefik")
       --tls                      Enable TLS encryption.
       --tls.ca string            Root CA for certificate verification if TLS is enabled
@@ -45,4 +46,4 @@ traefik-certs-dumper kv zookeeper [flags]
 
 * [traefik-certs-dumper kv](traefik-certs-dumper_kv.md)	 - Dump the content of a KV store.
 
-###### Auto generated by spf13/cobra on 22-Apr-2019
+###### Auto generated by spf13/cobra on 25-Apr-2019

docs/traefik-certs-dumper_version.md

@@ -27,6 +27,7 @@ traefik-certs-dumper version [flags]
       --domain-subdir      Use domain as sub-directory.
       --key-ext string     The file extension of the generated private keys. (default ".key")
       --key-name string    The file name (without extension) of the generated private keys. (default "privatekey")
+      --post-hook string   Execute a command only if changes occurs on the data source. (works only with the watch mode)
       --watch              Enable watching changes.
 ```
 
@@ -34,4 +35,4 @@ traefik-certs-dumper version [flags]
 
 * [traefik-certs-dumper](traefik-certs-dumper.md)	 - Dump Let's Encrypt certificates from Traefik.
 
-###### Auto generated by spf13/cobra on 22-Apr-2019
+###### Auto generated by spf13/cobra on 25-Apr-2019

dumper/config.go

@@ -8,4 +8,5 @@ type BaseConfig struct {
 	DomainSubDir bool
 	Clean        bool
 	Watch        bool
+	Hook         string
 }

dumper/file/file.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/fsnotify/fsnotify"
 	"github.com/ldez/traefik-certs-dumper/v2/dumper"
+	"github.com/ldez/traefik-certs-dumper/v2/hook"
 )
 
 // Dump Dumps "acme.json" file to certificates.
@@ -68,7 +69,7 @@ func watch(acmeFile string, baseConfig *dumper.BaseConfig) error {
 					return
 				}
 
-				if strings.EqualFold(os.Getenv("TCD_DEBUG"), "true") {
+				if isDebug() {
 					log.Println("event:", event)
 				}
 
@@ -115,7 +116,7 @@ func manageEvent(watcher *fsnotify.Watcher, event fsnotify.Event, acmeFile strin
 	}
 
 	if !bytes.Equal(previousHash, hash) {
-		if strings.EqualFold(os.Getenv("TCD_DEBUG"), "true") {
+		if isDebug() {
 			log.Println("detected changes on file:", event.Name)
 		}
 
@@ -123,9 +124,13 @@ func manageEvent(watcher *fsnotify.Watcher, event fsnotify.Event, acmeFile strin
 			return nil, errD
 		}
 
+		if isDebug() {
 			log.Println("Dumped new certificate data.")
 		}
 
+		hook.Exec(baseConfig.Hook)
+	}
+
 	return hash, nil
 }
 
@@ -156,3 +161,7 @@ func calculateHash(acmeFile string) ([]byte, error) {
 
 	return h.Sum(nil), nil
 }
+
+func isDebug() bool {
+	return strings.EqualFold(os.Getenv("TCD_DEBUG"), "true")
+}

dumper/kv/kv.go

@@ -7,10 +7,13 @@ import (
 	"fmt"
 	"io/ioutil"
 	"log"
+	"os"
+	"strings"
 
 	"github.com/abronan/valkeyrie"
 	"github.com/abronan/valkeyrie/store"
 	"github.com/ldez/traefik-certs-dumper/v2/dumper"
+	"github.com/ldez/traefik-certs-dumper/v2/hook"
 )
 
 const storeKeySuffix = "/acme/account/object"
@@ -55,8 +58,12 @@ func watch(kvStore store.Store, storeKey string, baseConfig *dumper.BaseConfig)
 			return err
 		}
 
+		if isDebug() {
 			log.Println("Dumped new certificate data.")
 		}
+
+		hook.Exec(baseConfig.Hook)
+	}
 }
 
 func dumpPair(pair *store.KVPair, baseConfig *dumper.BaseConfig) error {
@@ -86,3 +93,7 @@ func getStoredDataFromGzip(pair *store.KVPair) (*dumper.StoredData, error) {
 
 	return convertAccountV1ToV2(account), nil
 }
+
+func isDebug() bool {
+	return strings.EqualFold(os.Getenv("TCD_DEBUG"), "true")
+}

hook/hook.go

@@ -0,0 +1,41 @@
+package hook
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os/exec"
+	"strings"
+	"time"
+)
+
+// Exec Execute a command on a go routine.
+func Exec(command string) {
+	if command == "" {
+		return
+	}
+
+	go func() {
+		errH := execute(command)
+		if errH != nil {
+			panic(errH)
+		}
+	}()
+}
+
+func execute(command string) error {
+	ctxCmd, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	parts := strings.Fields(command)
+	output, err := exec.CommandContext(ctxCmd, parts[0], parts[1:]...).CombinedOutput()
+	if len(output) > 0 {
+		fmt.Println(string(output))
+	}
+
+	if ctxCmd.Err() == context.DeadlineExceeded {
+		return errors.New("hook timed out")
+	}
+
+	return err
+}

readme.md

@@ -18,6 +18,7 @@
 - Output formats:
     - use domain as sub-directory (allow custom names and extensions)
     - flat (domain as filename)
+- Hook (only with watch mode and if the data source changes)
 
 ## Installation
 
@@ -71,7 +72,6 @@ dump
 └──private
    ├──my.domain.com.crt
    └──letsencrypt.key
-
 ```
 
 ### Change source and destination
@@ -84,7 +84,6 @@ test
 └──private
    ├──my.domain.com.crt
    └──letsencrypt.key
-
 ```
 
 ### Use domain as sub-directory
@@ -102,7 +101,7 @@ dump
 #### Change file extension
 
 ```console
-$ traefik-certs-dumper file --domain-subdir=true --crt-ext=.pem --key-ext=.pem
+$ traefik-certs-dumper file --domain-subdir --crt-ext=.pem --key-ext=.pem
 dump
 ├──my.domain.com
 │  ├──certificate.pem
@@ -114,7 +113,7 @@ dump
 #### Change file name
 
 ```console
-$ traefik-certs-dumper file --domain-subdir=true --crt-name=fullchain --key-name=privkey
+$ traefik-certs-dumper file --domain-subdir --crt-name=fullchain --key-name=privkey
 dump
 ├──my.domain.com
 │  ├──fullchain.crt