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58 lines
3.2 KiB
Markdown
58 lines
3.2 KiB
Markdown
# Trivy scan (image)
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Composite action that runs **`trivy image`** inside **Docker** with the same hardening style as [setup-db](../setup-db): read-only root filesystem, dropped capabilities, `no-new-privileges`, AppArmor `docker-default`, a private `tmpfs` on `/tmp`, and resource limits.
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You pass a pullable **`image`** reference (e.g. `alpine:3.20` or a digest). Trivy pulls and scans it inside the container. The Trivy cache from [setup-db](../setup-db) is mounted **read-only** at `/cache` (**`--skip-db-update`** avoids re-downloading the DB). Your **`output-dir`** is mounted **read-write** at `/out`; the report is written as **`output-file`** inside that directory. The report format is always **SARIF** (`--format sarif`). Trivy is always run with **`--offline-scan`** (no API calls to identify dependencies) and **`--exit-code 0`** (the step succeeds after writing the report even when findings are present). Image layers are still pulled over the network when needed.
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**Image scans need network access** to pull the image (and possibly layers). This action does **not** set `--network none` (unlike [scan-config](../scan-config) and [scan-fs](../scan-fs)).
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## Prerequisites
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- Docker on the runner.
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- A populated Trivy cache at **`cache-dir`** (typically from the [setup-db](../setup-db) action).
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## Usage
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```yaml
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- name: Setup Trivy DB cache
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id: db
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uses: ./setup-db
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- name: Image scan
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id: scan
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uses: ./scan-image
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with:
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image: alpine:3.20
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cache-dir: ${{ steps.db.outputs.cache-dir }}
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output-dir: ${{ runner.temp }}/trivy-reports
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output-file: image.sarif
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- name: Upload report
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uses: actions/upload-artifact@v4
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with:
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name: trivy-image
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path: ${{ steps.scan.outputs.output-path }}
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```
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## Inputs
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| Input | Description | Required | Default |
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| --------------- | --------------------------------------------------------------------------- | -------- | ------- |
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| `image` | Image reference to scan (pulled inside the container) | Yes | — |
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| `cache-dir` | Trivy cache directory (mounted read-only at `/cache`) | No | `${{ runner.temp }}/trivy` |
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| `output-dir` | Host directory for the report (mounted read-write at `/out`) | Yes | — |
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| `output-file` | SARIF file name only (no `/`); created under `output-dir` | Yes | — |
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| `trivy-version` | Trivy Docker image (digest pin recommended) | No | Same pin as `setup-db` / see `action.yaml` |
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**`trivy-version` is optional.** Omit it to use the default image from `action.yaml`.
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## Outputs
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| Output | Description |
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| -------------- | ------------------------------------ |
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| `output-path` | Absolute path to the SARIF report on the host |
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## Notes
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- **`output-dir`** is created with `mkdir -p` if missing; **`cache-dir`** must already exist.
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- Local-only images (e.g. built on the host) are not supported unless they are available to the **inner** Docker pull (this action does not mount `docker.sock`).
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- The step still fails if Docker or the container exits non-zero before Trivy completes (e.g. mount or runtime errors).
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