Pass --cache-dir as global argument to Trivy (#51)

* feat: add ignore-policy option to filter vulnerabilities

* fix: format README

Dockerfile

@@ -1,4 +1,4 @@
-FROM aquasec/trivy:0.18.0
+FROM aquasec/trivy:0.18.1
 COPY entrypoint.sh /
 RUN apk --no-cache add bash
 RUN chmod +x /entrypoint.sh

README.md

@@ -284,13 +284,14 @@ Following inputs can be used as `step.with` keys:
 | `format`         | String  | `table`                            | Output format (`table`, `json`, `template`)   |
 | `template`       | String  |                                    | Output template (`@/contrib/sarif.tpl`, `@/contrib/gitlab.tpl`, `@/contrib/junit.tpl`)|
 | `output`         | String  |                                    | Save results to a file                        |
-| `exit-code`      | String  | `0`                                | Exit code when vulnerabilities were found     |
+| `exit-code`      | String  | `0`                                | Exit code when specified vulnerabilities are found     |
 | `ignore-unfixed` | Boolean | false                              | Ignore unpatched/unfixed vulnerabilities      |
 | `vuln-type`      | String  | `os,library`                       | Vulnerability types (os,library)              |
-| `severity`       | String  | `UNKNOWN,LOW,MEDIUM,HIGH,CRITICAL` | Severities of vulnerabilities to be displayed |
+| `severity`       | String  | `UNKNOWN,LOW,MEDIUM,HIGH,CRITICAL` | Severities of vulnerabilities to scanned for and displayed |
 | `skip-dirs`       | String  |                                   | Comma separated list of directories where traversal is skipped |
 | `cache-dir`      | String  |                                    | Cache directory                               |
 | `timeout`        | String  | `2m0s`                             | Scan timeout duration                         |
+| `ignore-policy`  | String  |                                    | Filter vulnerabilities with OPA rego language |
 
 [release]: https://github.com/aquasecurity/trivy-action/releases/latest
 [release-img]: https://img.shields.io/github/release/aquasecurity/trivy-action.svg?logo=github

action.yaml

@@ -57,6 +57,10 @@ inputs:
     description: 'timeout (default 2m0s)'
     required: false
     default: ''
+  ignore-policy:
+    description: 'filter vulnerabilities with OPA rego language'
+    required: false
+    default: ''
 runs:
   using: 'docker'
   image: "Dockerfile"
@@ -75,3 +79,4 @@ runs:
     - '-l ${{ inputs.input }}'
     - '-m ${{ inputs.cache-dir }}'
     - '-n ${{ inputs.timeout }}'
+    - '-o ${{ inputs.ignore-policy }}'

entrypoint.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 set -e
-while getopts "a:b:c:d:e:f:g:h:i:j:k:l:m:n:" o; do
+while getopts "a:b:c:d:e:f:g:h:i:j:k:l:m:n:o:" o; do
    case "${o}" in
        a)
          export scanType=${OPTARG}
@@ -44,6 +44,9 @@ while getopts "a:b:c:d:e:f:g:h:i:j:k:l:m:n:" o; do
        n)
          export timeout=${OPTARG}
        ;;
+       o)
+         export ignorePolicy=${OPTARG}
+       ;;
   esac
 done
 
@@ -58,6 +61,11 @@ if [ $input ]; then
 fi
 ignoreUnfixed=$(echo $ignoreUnfixed | tr -d '\r')
 
+GLOBAL_ARGS=""
+if [ $cacheDir ];then
+  GLOBAL_ARGS="$GLOBAL_ARGS --cache-dir $cacheDir"
+fi
+
 ARGS=""
 if [ $format ];then
  ARGS="$ARGS --format $format"
@@ -86,12 +94,13 @@ if [ $skipDirs ];then
     ARGS="$ARGS --skip-dirs $i"
   done
 fi
-if [ $cacheDir ];then
-  ARGS="$ARGS --cache-dir $cacheDir"
-fi
 if [ $timeout ];then
   ARGS="$ARGS --timeout $timeout"
 fi
+if [ $ignorePolicy ];then
+  ARGS="$ARGS --ignore-policy $ignorePolicy"
+fi
 
 echo "Running trivy with options: " --no-progress "${ARGS}" "${artifactRef}"
-trivy ${scanType} --no-progress $ARGS ${artifactRef}
+echo "Global options: " "${GLOBAL_ARGS}"
+trivy $GLOBAL_ARGS ${scanType} --no-progress $ARGS ${artifactRef}