feat: add some testing.

.drone.yml

@@ -21,6 +21,7 @@ pipeline:
       TAGS: netgo
       GOPATH: /srv/app
     commands:
+      - make ssh-server
       - make dep_install
       - make vet
       - make lint

.drone.yml.sig

@@ -1 +1 @@
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Makefile

@@ -110,5 +110,17 @@ clean:
 	go clean -x -i ./...
 	rm -rf coverage.txt $(EXECUTABLE) $(DIST) vendor
 
+ssh-server:
+	adduser -h /home/drone-scp -s /bin/bash -D -S drone-scp
+	passwd -d drone-scp
+	mkdir -p /home/drone-scp/.ssh
+	chmod 700 /home/drone-scp/.ssh
+	cp tests/.ssh/id_rsa.pub /home/drone-scp/.ssh/authorized_keys
+	chown -R drone-scp /home/drone-scp/.ssh
+	# install ssh and start server
+	apk update && apk add openssh openrc
+	rm -rf /etc/ssh/ssh_host_rsa_key /etc/ssh/ssh_host_dsa_key
+	./tests/entrypoint.sh /usr/sbin/sshd -D &
+
 version:
 	@echo $(VERSION)

plugin.go

@@ -15,6 +15,8 @@ import (
 const (
 	missingHostOrUser    = "Error: missing server host or user"
 	missingPasswordOrKey = "Error: can't connect without a private SSH key or password"
+	unableConnectServer  = "Error: Failed to start a SSH session"
+	failParsePrivateKey  = "Error: Failed to parse private key"
 )
 
 type (
@@ -59,7 +61,7 @@ func (p Plugin) Exec() error {
 			signer, err := ssh.ParsePrivateKey([]byte(p.Config.Key))
 
 			if err != nil {
-				return fmt.Errorf("Error: Failed to parse private key. %s", err)
+				return fmt.Errorf(failParsePrivateKey)
 			}
 
 			auths = append(auths, ssh.PublicKeys(signer))
@@ -80,15 +82,10 @@ func (p Plugin) Exec() error {
 		client, err := ssh.Dial("tcp", addr, config)
 
 		if err != nil {
-			return fmt.Errorf("Error: Failed to dial to server. %s", err)
+			return fmt.Errorf(unableConnectServer)
-		}
-
-		session, err := client.NewSession()
-
-		if err != nil {
-			return fmt.Errorf("Error: Failed to start a SSH session. %s", err)
 		}
 
+		session, _ := client.NewSession()
 		defer session.Close()
 
 		session.Stdout = os.Stdout

plugin_test.go

@@ -28,3 +28,77 @@ func TestMissingKeyOrPassword(t *testing.T) {
 	assert.NotNil(t, err)
 	assert.Equal(t, missingPasswordOrKey, err.Error())
 }
+
+func TestIncorrectPassword(t *testing.T) {
+	plugin := Plugin{
+		Config: Config{
+			Host:     []string{"localhost"},
+			User:     "drone-scp",
+			Port:     22,
+			Password: "123456",
+			Script:   []string{"whoami"},
+		},
+	}
+
+	err := plugin.Exec()
+	assert.NotNil(t, err)
+	assert.Equal(t, unableConnectServer, err.Error())
+}
+
+func TestFailParsePrivateKey(t *testing.T) {
+	plugin := Plugin{
+		Config: Config{
+			Host:   []string{"localhost"},
+			User:   "drone-scp",
+			Port:   22,
+			Key:    "123456",
+			Script: []string{"whoami"},
+		},
+	}
+
+	err := plugin.Exec()
+	assert.NotNil(t, err)
+	assert.Equal(t, failParsePrivateKey, err.Error())
+}
+
+func TestSSHScript(t *testing.T) {
+	plugin := Plugin{
+		Config: Config{
+			Host: []string{"localhost"},
+			User: "drone-scp",
+			Port: 22,
+			Key: `-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEA4e2D/qPN08pzTac+a8ZmlP1ziJOXk45CynMPtva0rtK/RB26
+VbfAF0hIJji7ltvnYnqCU9oFfvEM33cTn7T96+od8ib/Vz25YU8ZbstqtIskPuwC
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+7XC9wlRna4b3Ln8ew3q1ZcBjXwD4ppbTlmwAfQIaZTGJUgQbdsO9YA==
+-----END RSA PRIVATE KEY-----
+`,
+			Script: []string{"whoami"},
+		},
+	}
+
+	err := plugin.Exec()
+	assert.Nil(t, err)
+}

tests/.ssh/id_rsa

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEA4e2D/qPN08pzTac+a8ZmlP1ziJOXk45CynMPtva0rtK/RB26
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+7XC9wlRna4b3Ln8ew3q1ZcBjXwD4ppbTlmwAfQIaZTGJUgQbdsO9YA==
+-----END RSA PRIVATE KEY-----

tests/.ssh/id_rsa.pub

@@ -0,0 +1 @@
+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDh7YP+o83TynNNpz5rxmaU/XOIk5eTjkLKcw+29rSu0r9EHbpVt8AXSEgmOLuW2+dieoJT2gV+8QzfdxOftP3r6h3yJv9XPblhTxluy2q0iyQ+7AJu/crSYAeCy+InJEPvIz5ApNsFASBsa5bqC1swqGJh+IgHgPKPsB1L9+Te/brAODPtIcjk4Gq71u/UqHFBh0USdTc8C0Cp5xyDM2lsfd5gvIbO5TEQgmWGln+5TYb2mmP9xKs41U+IjwCGLhGuVmOY/mXnv+yrUKUa6XIukVwzDryQ/kWKTKoekckdEE2BTnvXLQ+HfdKMFuzSFoIgByat5YSEZ7785ecl7pVR drone-scp@localhost

tests/entrypoint.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+if [ ! -f "/etc/ssh/ssh_host_rsa_key" ]; then
+  # generate fresh rsa key
+  ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa
+fi
+
+if [ ! -f "/etc/ssh/ssh_host_dsa_key" ]; then
+  # generate fresh dsa key
+  ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa
+fi
+
+exec "$@"