diff --git a/.gitignore b/.gitignore
index ad46b308..1649e6a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -59,3 +59,5 @@ typings/
 
 # next.js build output
 .next
+
+.idea/
diff --git a/lib/entrypoint.sh b/lib/entrypoint.sh
index c67a33f1..8e33652f 100755
--- a/lib/entrypoint.sh
+++ b/lib/entrypoint.sh
@@ -2,6 +2,12 @@
 
 set -e
 
+if [ -z "$PROJECT_DIRECTORY" ]
+then
+  PROJECT_DIRECTORY="."
+fi
+
+cd $PROJECT_DIRECTORY
 npm install
 
 NODE_PATH=node_modules node /action/lib/run.js
diff --git a/lib/run.js b/lib/run.js
index 6dd57b7b..8e73127e 100644
--- a/lib/run.js
+++ b/lib/run.js
@@ -38,7 +38,10 @@ function eslint() {
   const eslint = require('eslint')
 
   const cli = new eslint.CLIEngine()
-  const report = cli.executeOnFiles(['.'])
+
+  const filePattern = process.env.FILE_PATTERN || '.';
+
+  const report = cli.executeOnFiles([filePattern])
   // fixableErrorCount, fixableWarningCount are available too
   const { results, errorCount, warningCount } = report