use known_hosts: no instead of no_known_hosts: true

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

@@ -317,6 +317,6 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        no_known_hosts: true
+        known_hosts: no
     - name: print created files
       run: ls -l /root/.ssh

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

@@ -337,6 +337,6 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        no_known_hosts: true
+        known_hosts: no
     - name: print created files
       run: ls -l /root/.ssh

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

@@ -255,6 +255,6 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        no_known_hosts: true
+        known_hosts: no
     - name: print created files
       run: ls -l ~/.ssh

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

@@ -275,6 +275,6 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        no_known_hosts: true
+        known_hosts: no
     - name: print created files
       run: ls -l ~/.ssh

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

@@ -255,6 +255,6 @@ jobs:
       uses: ./.
       with:
         key: ${{ secrets.SSH_KEY_PEM }}
-        no_known_hosts: true
+        known_hosts: no
     - name: print created files
       run: ls -l ~/.ssh

action.yml

@@ -14,7 +14,7 @@ inputs:
     required: false
     default: "id_rsa"
   known_hosts:
-    description: "public keys of SSH servers"
+    description: "public keys of SSH servers, or set to 'no' in order to omit it"
     required: true
     default: ""
   config:
@@ -25,10 +25,6 @@ inputs:
     description: "replace / ignore / fail"
     required: false
     default: "fail"
-  no_known_hosts:
-    description: "enables not providing known_hosts file"
-    required: false
-    default: "0"
 runs:
   using: "node12"
   main: "lib/index.js"

lib/index.js

@@ -428,13 +428,12 @@ const core = __importStar(__nccwpck_require__(186));
 function main() {
     try {
         // parameters
-        const noKnownHosts = string2boolean(core.getInput("no_known_hosts"));
         const key = core.getInput("key", {
             required: true,
         });
         const name = core.getInput("name");
         const knownHosts = core.getInput("known_hosts", {
-            required: !noKnownHosts, // optional if no_known_hosts is true
+            required: true,
         });
         const config = core.getInput("config");
         const ifKeyExists = core.getInput("if_key_exists");
@@ -457,7 +456,7 @@ function main() {
                 },
             });
         }
-        if (knownHosts !== "") {
+        if (knownHosts !== "no") {
             files.push({
                 name: "known_hosts",
                 contents: insertLf(knownHosts, true, true),
@@ -488,27 +487,6 @@ function main() {
         core.setFailed(err.message);
     }
 }
-/**
- * convert string to boolean
- * @param value string value
- * @returns boolean value
- */
-function string2boolean(value) {
-    // true if "true" / "yes" / "on"
-    switch (value.trim().toLowerCase()) {
-        case "true":
-        case "yes":
-        case "on":
-            return true;
-    }
-    // true if number and non-zero
-    const numberValue = Number(value);
-    if (!isNaN(numberValue) && numberValue !== 0) {
-        return true;
-    }
-    // false otherwise
-    return false;
-}
 /**
  * get home directory
  * @returns home directory

src/main.ts

@@ -18,13 +18,12 @@ function main(): void
 	try
 	{
 		// parameters
-		const noKnownHosts = string2boolean(core.getInput("no_known_hosts"));
 		const key = core.getInput("key", {
 			required: true,
 		});
 		const name = core.getInput("name");
 		const knownHosts = core.getInput("known_hosts", {
-			required: !noKnownHosts, // optional if no_known_hosts is true
+			required: true,
 		});
 		const config = core.getInput("config");
 		const ifKeyExists = core.getInput("if_key_exists");
@@ -50,7 +49,7 @@ function main(): void
 				},
 			});
 		}
-		if(knownHosts !== "")
+		if(knownHosts !== "no")
 		{
 			files.push({
 				name: "known_hosts",
@@ -88,33 +87,6 @@ function main(): void
 	}
 }
 
-/**
- * convert string to boolean
- * @param value string value
- * @returns boolean value
- */
-function string2boolean(value: string): boolean
-{
-	// true if "true" / "yes" / "on"
-	switch(value.trim().toLowerCase())
-	{
-	case "true":
-	case "yes":
-	case "on":
-		return true;
-	}
-
-	// true if number and non-zero
-	const numberValue = Number(value);
-	if(!isNaN(numberValue) && numberValue !== 0)
-	{
-		return true;
-	}
-
-	// false otherwise
-	return false;
-}
-
 /**
  * get home directory
  * @returns home directory