"known_hosts: no" -> "known_hosts: unnecessary"

.github/workflows/verify-on-container-centos.yml

@@ -293,8 +293,8 @@ jobs:
     - name: git clone through SSH
       run: git clone git@github.com:shimataro/ssh-key-action.git tmp
 
-  no_known_hosts:
-    name: no known_hosts file
+  known_hosts-unnecessary:
+    name: without known_hosts file
     runs-on: ${{ matrix.os }}
     container: ${{ matrix.container }}
     strategy:
@@ -317,6 +317,6 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: no
+        known_hosts: unnecessary
     - name: print created files
       run: ls -l /root/.ssh

.github/workflows/verify-on-container-ubuntu.yml

@@ -311,8 +311,8 @@ jobs:
     - name: git clone through SSH
       run: git clone git@github.com:shimataro/ssh-key-action.git tmp
 
-  no_known_hosts:
-    name: no known_hosts file
+  known_hosts-unnecessary:
+    name: without known_hosts file
     runs-on: ${{ matrix.os }}
     container: ${{ matrix.container }}
     strategy:
@@ -337,6 +337,6 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: no
+        known_hosts: unnecessary
     - name: print created files
       run: ls -l /root/.ssh

.github/workflows/verify-on-macos.yml

@@ -238,8 +238,8 @@ jobs:
     - name: git clone through SSH
       run: git clone git@github.com:shimataro/ssh-key-action.git tmp
 
-  no_known_hosts:
-    name: no known_hosts file
+  known_hosts-unnecessary:
+    name: without known_hosts file
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -255,6 +255,6 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: no
+        known_hosts: unnecessary
     - name: print created files
       run: ls -l ~/.ssh

.github/workflows/verify-on-ubuntu.yml

@@ -258,8 +258,8 @@ jobs:
     - name: git clone through SSH
       run: git clone git@github.com:shimataro/ssh-key-action.git tmp
 
-  no_known_hosts:
-    name: no known_hosts file
+  known_hosts-unnecessary:
+    name: without known_hosts file
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -275,6 +275,6 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: no
+        known_hosts: unnecessary
     - name: print created files
       run: ls -l ~/.ssh

.github/workflows/verify-on-windows.yml

@@ -238,8 +238,8 @@ jobs:
     - name: git clone through SSH
       run: git clone git@github.com:shimataro/ssh-key-action.git tmp
 
-  no_known_hosts:
-    name: no known_hosts file
+  known_hosts-unnecessary:
+    name: without known_hosts file
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -255,6 +255,6 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        known_hosts: no
+        known_hosts: unnecessary
     - name: print created files
       run: ls -l ~/.ssh

README.md

@@ -34,7 +34,7 @@ steps:
   with:
     key: ${{ secrets.SSH_KEY }}
     name: id_rsa # optional
-    known_hosts: ${{ secrets.KNOWN_HOSTS }} # known_hosts; set to "no" in order to omit
+    known_hosts: ${{ secrets.KNOWN_HOSTS }}
     config: ${{ secrets.CONFIG }} # ssh_config; optional
     if_key_exists: fail # replace / ignore / fail; optional (defaults to fail)
 - name: rsync over ssh
@@ -43,8 +43,6 @@ steps:
 
 See [Workflow syntax for GitHub Actions](https://help.github.com/en/articles/workflow-syntax-for-github-actions) for details.
 
-**NOTE:** `known_hosts: no` with `StrictHostKeyChecking=no` is not secure. Use it ONLY IF you are using secure methods, such as SSHFP and signed server key.
-
 ### Install multiple keys
 
 If you want to install multiple keys, call this action multiple times.
@@ -110,7 +108,7 @@ If **"It is hard to prefetch server key because the server will be created dynam
 By the way, there are some secure methods to SSH without `known_hosts`, such as SSHFP and signed server key.
 And here is a special value to omit `known_hosts`. You should use it ONLY IF you are sure that it is secure enough.
 You should use it ONLY IF you are using secure methods...
-It is `known_hosts: no`.
+It is `known_hosts: unnecessary`.
 
 ### How do I use encrypted SSH key?
 

lib/index.js

@@ -456,7 +456,7 @@ function main() {
                 },
             });
         }
-        if (knownHosts !== "no") {
+        if (knownHosts !== "unnecessary") {
             files.push({
                 name: "known_hosts",
                 contents: insertLf(knownHosts, true, true),

src/main.ts

@@ -49,7 +49,7 @@ function main(): void
 				},
 			});
 		}
-		if(knownHosts !== "no")
+		if(knownHosts !== "unnecessary")
 		{
 			files.push({
 				name: "known_hosts",