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README.md

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+# Directory push/pop action
+
+This action moves the named directory (if it exists) out of the specified cache directory into the (optionally specified) destination directory. If the destination is not specified, it defaults to `$GITHUB_WORKSPACE`.
+
+When the job that uses this action ends, the action moves the directory back to the cache directory.
+
+## Inputs
+
+### `cacheDirectory`
+
+**Required** Path to the directory used to store directories
+
+### `namedDirectory`
+
+**Required** Name of the directory to move
+
+### `destinationDirectory`
+
+Where to move the named directory to
+
+## Example usage
+
+```yaml
+uses: linaro-its/directory-push-pop@v1
+with:
+    cacheDirectory: /srv/cache
+    namedDirectory: $SITE_URL
+```

action.yml

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+name: Directory push/pop
+author: Philip Colmer (Linaro Ltd)
+branding:
+  icon: "archive"
+  color: "green"
+description: |
+  By using a nominated cache directory, this action moves a named directory
+  out of the cache into the specified destination directory (default is
+  $GITHUB_WORKSPACE) and then, after the job finishes, moves it back.
+inputs:
+  cacheDirectory:
+    description: "Path to the directory used to store directories"
+    required: true
+  namedDirectory:
+    description: "Name of the directory to move"
+    required: true
+  destinationDirectory:
+    description: "Where to move the named directory to"
+    required: false
+runs:
+  using: "node12"
+  main: 'directory-out.js'
+  post: 'directory-in.js'

directory-in.js

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+// Reverses what directory-out did, namely moving the
+// named directory out of the destination directory back
+// into the cache directory.
+const core = require('@actions/core');
+const fs = require('fs');
+
+function isDirSync(aPath) {
+    const result = fs.statSync(aPath).isDirectory();
+    // No error if something exists with the name so
+    // throw an error if not a directory.
+    if (!result) {
+        throw `${aPath} is not a directory`
+    }
+}
+
+function dirExists(aPath) {
+    try {
+        const result = fs.statSync(aPath).isDirectory();
+        if (result) {
+            return true;
+        }
+    } catch (e) {
+        return false;
+    }
+
+    return false;
+}
+
+try {
+    const cacheDirectory = core.getInput("cacheDirectory", { required: true });
+    const namedDirectory = core.getInput("namedDirectory", { required: true });
+    var destinationDirectory = core.getInput("destinationDirectory");
+    // If the destination directory wasn't specified, default to $GITHUB_WORKSPACE
+    if (!destinationDirectory) {
+        destinationDirectory = process.env["GITHUB_WORKSPACE"];
+    }
+    // Check that cache and dest exist and are directories.
+    isDirSync(cacheDirectory);
+    isDirSync(destinationDirectory);
+    // If the named directory exists, move it.
+    if (dirExists(`${destinationDirectory}/${namedDirectory}`)) {
+        fs.renameSync(`${destinationDirectory}/${namedDirectory}`, `${cacheDirectory}/${namedDirectory}`);
+    }
+} catch (error) {
+    core.setFailed(error.message);
+}

directory-out.js

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+// Move the named directory (if it exists) out of the cache directory
+// into the destination directory.
+const core = require('@actions/core');
+const fs = require('fs');
+
+function isDirSync(aPath) {
+    const result = fs.statSync(aPath).isDirectory();
+    // No error if something exists with the name so
+    // throw an error if not a directory.
+    if (!result) {
+        throw `${aPath} is not a directory`
+    }
+}
+
+function dirExists(aPath) {
+    try {
+        const result = fs.statSync(aPath).isDirectory();
+        if (result) {
+            return true;
+        }
+    } catch (e) {
+        return false;
+    }
+
+    return false;
+}
+
+try {
+    const cacheDirectory = core.getInput("cacheDirectory", { required: true });
+    const namedDirectory = core.getInput("namedDirectory", { required: true });
+    var destinationDirectory = core.getInput("destinationDirectory");
+    // If the destination directory wasn't specified, default to $GITHUB_WORKSPACE
+    if (!destinationDirectory) {
+        destinationDirectory = process.env["GITHUB_WORKSPACE"];
+    }
+    // Check that cache and dest exist and are directories.
+    isDirSync(cacheDirectory);
+    isDirSync(destinationDirectory);
+    // If the named directory exists, move it.
+    if (dirExists(`${cacheDirectory}/${namedDirectory}`)) {
+        fs.renameSync(`${cacheDirectory}/${namedDirectory}`, `${destinationDirectory}/${namedDirectory}`);
+    }
+} catch (error) {
+    core.setFailed(error.message);
+}