Add env var key

internal/provider/data_source_remotefile.go

@@ -60,6 +60,11 @@ func dataSourceRemotefile() *schema.Resource {
 							Optional:    true,
 							Description: "The path of the private key used to login to the target host.",
 						},
+						"private_key_env_var": {
+							Type:        schema.TypeString,
+							Optional:    true,
+							Description: "The env var of the private key used to login to the target host.",
+						},
 					},
 				},
 			},

internal/provider/provider.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"io/ioutil"
+	"os"
 	"strconv"
 	"strings"
 	"sync"
@@ -115,6 +116,16 @@ func RemoteClientFromResource(d *schema.ResourceData) (*RemoteClient, error) {
 		clientConfig.Auth = append(clientConfig.Auth, ssh.PublicKeys(signer))
 	}
 
+	private_key_env_var, ok := d.GetOk("conn.0.private_key_env_var")
+	if ok {
+		private_key := os.Getenv(private_key_env_var.(string))
+		signer, err := ssh.ParsePrivateKey([]byte(private_key))
+		if err != nil {
+			return nil, fmt.Errorf("couldn't create a ssh client config from private key env var: %s", err.Error())
+		}
+		clientConfig.Auth = append(clientConfig.Auth, ssh.PublicKeys(signer))
+	}
+
 	host := fmt.Sprintf("%s:%d", d.Get("conn.0.host").(string), d.Get("conn.0.port").(int))
 	return NewRemoteClient(host, clientConfig)
 }

internal/provider/resource_remotefile.go

@@ -64,6 +64,11 @@ func resourceRemotefile() *schema.Resource {
 							Optional:    true,
 							Description: "The path of the private key used to login to the target host.",
 						},
+						"private_key_env_var": {
+							Type:        schema.TypeString,
+							Optional:    true,
+							Description: "The env var of the private key used to login to the target host.",
+						},
 					},
 				},
 			},