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image: nemunaire/drone-syft:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}
{{#if build.tags}}
tags:
{{#each build.tags}}
- {{this}}
{{/each}}
{{/if}}
manifests:
- image: nemunaire/drone-syft:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-amd64
platform:
architecture: amd64
os: linux
- image: nemunaire/drone-syft:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-arm64
platform:
architecture: arm64
os: linux
variant: v8
- image: nemunaire/drone-syft:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-arm
platform:
architecture: arm
os: linux
variant: v7

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---
kind: pipeline
type: docker
name: build-amd64
platform:
os: linux
arch: amd64
steps:
- name: publish on Docker Hub
image: plugins/docker
settings:
repo: nemunaire/drone-syft
auto_tag: true
auto_tag_suffix: ${DRONE_STAGE_OS}-${DRONE_STAGE_ARCH}
dockerfile: Dockerfile
username:
from_secret: docker_username
password:
from_secret: docker_password
---
kind: pipeline
type: docker
name: build-arm64
platform:
os: linux
arch: arm64
steps:
- name: publish on Docker Hub
image: plugins/docker
settings:
repo: nemunaire/drone-syft
auto_tag: true
auto_tag_suffix: ${DRONE_STAGE_OS}-${DRONE_STAGE_ARCH}
dockerfile: Dockerfile
username:
from_secret: docker_username
password:
from_secret: docker_password
---
kind: pipeline
name: docker-manifest
steps:
- name: publish on Docker Hub
image: plugins/manifest
settings:
auto_tag: true
ignore_missing: true
spec: .drone-manifest.yml
username:
from_secret: docker_username
password:
from_secret: docker_password
trigger:
event:
- cron
- push
- tag
depends_on:
- build-amd64
- build-arm64

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.env
release/
vendor/

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FROM golang:1-alpine AS builder
WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 go build -o /bin/plugin .
FROM anchore/syft
COPY --from=builder /bin/plugin /bin/plugin
ENTRYPOINT ["/bin/plugin"]

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A plugin to generate SBOMs (Software Bill of Materials) using [anchore/syft](https://github.com/anchore/syft).
# Usage
The following settings changes this plugin's behavior.
* select_catalogers (optional) comma-separated list of catalogers to use.
* output (optional) comma-separated list of output formats (e.g. `spdx-json=report.json,cyclonedx-json`).
* source_name (optional) name to use as the source in the SBOM.
The source version is automatically derived from `DRONE_TAG` if set, otherwise `DRONE_COMMIT_SHA`.
Below is an example `.drone.yml` that uses this plugin.
```yaml
kind: pipeline
name: default
steps:
- name: sbom
image: nemunaire/drone-syft
pull: if-not-exists
settings:
output: spdx-json=sbom.spdx.json
source_name: my-project
```
Below is an example with multiple outputs and cataloger selection.
```yaml
kind: pipeline
name: default
steps:
- name: sbom
image: nemunaire/drone-syft
pull: if-not-exists
settings:
select_catalogers: dpkg,rpm
output: spdx-json=sbom.spdx.json,cyclonedx-json=sbom.cdx.json
source_name: my-project
```
# Building
Build the plugin binary:
```text
scripts/build.sh
```
Build the plugin image:
```text
docker build -t nemunaire/drone-syft -f docker/Dockerfile .
```
# Testing
Execute the plugin from your current working directory:
```text
docker run --rm \
-e DRONE_COMMIT_SHA=8f51ad7884c5eb69c11d260a31da7a745e6b78e2 \
-e DRONE_COMMIT_BRANCH=master \
-e DRONE_BUILD_NUMBER=43 \
-e DRONE_BUILD_STATUS=success \
-w /drone/src \
-v $(pwd):/drone/src \
nemunaire/drone-syft
```

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{
"type": "AdaptiveCard",
"body": [
{
"type": "ColumnSet",
"columns": [
{
"type": "Column",
"items": [
{
"type": "Image",
"url": "https://cdn-dllid.nitrocdn.com/lfaFdmeTaONuMeYAvisIiEiZRrNJpVpd/assets/images/source/rev-954346f/anchore.com/wp-content/uploads/2023/01/logo-1.svg",
"size": "Small"
}
],
"width": "auto"
},
{
"type": "Column",
"items": [
{
"type": "TextBlock",
"text": "Plugin: Syft",
"wrap": true,
"size": "Small",
"weight": "Bolder",
"isSubtle": false,
"spacing": "Small"
},
{
"type": "TextBlock",
"text": "Source: ${$root.sourceName}",
"wrap": true,
"size": "Small",
"weight": "Lighter",
"isSubtle": true,
"spacing": "Small"
}
],
"width": "stretch"
}
],
"style": "default"
},
{
"type": "ColumnSet",
"columns": [
{
"type": "Column",
"width": "auto",
"items": [
{
"type": "TextBlock",
"size": "Small",
"text": "Version: ${$root.sourceVersion}",
"wrap": true,
"spacing": "None"
}
]
},
{
"type": "Column",
"width": "auto",
"separator": true,
"spacing": "Medium",
"items": [
{
"type": "TextBlock",
"size": "Small",
"text": "Packages: ${formatNumber($root.packageCount, 0)}",
"wrap": true,
"spacing": "None"
}
]
}
],
"style": "default",
"separator": true
}
],
"$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
"version": "1.5"
}

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module github.com/nemunaire/drone-syft
go 1.25
require (
github.com/kelseyhightower/envconfig v1.4.0
github.com/sirupsen/logrus v1.9.3
)
require golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect

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github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/kelseyhightower/envconfig v1.4.0 h1:Im6hONhd3pLkfDFsbRgu68RDNkGF1r3dvMUtDTo2cv8=
github.com/kelseyhightower/envconfig v1.4.0/go.mod h1:cccZRl6mQpaq41TPp5QxidR+Sa3axMbJDNb//FQX6Gg=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 h1:0A+M6Uqn+Eje4kHMK80dtF3JCXC4ykBgQG4Fe06QRhQ=
golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

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package main
import (
"context"
"github.com/nemunaire/drone-syft/plugin"
"github.com/kelseyhightower/envconfig"
"github.com/sirupsen/logrus"
)
func main() {
logrus.SetFormatter(new(formatter))
var args plugin.Args
if err := envconfig.Process("", &args); err != nil {
logrus.Fatalln(err)
}
switch args.Level {
case "debug":
logrus.SetFormatter(textFormatter)
logrus.SetLevel(logrus.DebugLevel)
case "trace":
logrus.SetFormatter(textFormatter)
logrus.SetLevel(logrus.TraceLevel)
}
if err := plugin.Exec(context.Background(), args); err != nil {
logrus.Fatalln(err)
}
}
// default formatter that writes logs without including timestamp
// or level information.
type formatter struct{}
func (*formatter) Format(entry *logrus.Entry) ([]byte, error) {
return []byte(entry.Message), nil
}
// text formatter that writes logs with level information
var textFormatter = &logrus.TextFormatter{
DisableTimestamp: true,
}

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package plugin
// Pipeline provides Pipeline metadata from the environment.
type Pipeline struct {
// Build provides build metadata.
Build struct {
Branch string `envconfig:"DRONE_BUILD_BRANCH"`
Number int `envconfig:"DRONE_BUILD_NUMBER"`
Parent int `envconfig:"DRONE_BUILD_PARENT"`
Event string `envconfig:"DRONE_BUILD_EVENT"`
Action string `envconfig:"DRONE_BUILD_ACTION"`
Status string `envconfig:"DRONE_BUILD_STATUS"`
Created int64 `envconfig:"DRONE_BUILD_CREATED"`
Started int64 `envconfig:"DRONE_BUILD_STARTED"`
Finished int64 `envconfig:"DRONE_BUILD_FINISHED"`
Link string `envconfig:"DRONE_BUILD_LINK"`
}
// Calver provides the calver details parsed from the
// git tag. If the git tag is empty or is not a valid
// calver, the values will be empty.
Calver struct {
Version string `envconfig:"DRONE_CALVER"`
Short string `envconfig:"DRONE_CALVER_SHORT"`
MajorMinor string `envconfig:"DRONE_CALVER_MAJOR_MINOR"`
Major string `envconfig:"DRONE_CALVER_MAJOR"`
Minor string `envconfig:"DRONE_CALVER_MINOR"`
Micro string `envconfig:"DRONE_CALVER_MICRO"`
Modifier string `envconfig:"DRONE_CALVER_MODIFIER"`
}
// Commit provides the commit metadata.
Commit struct {
Rev string `envconfig:"DRONE_COMMIT_SHA"`
Before string `envconfig:"DRONE_COMMIT_BEFORE"`
After string `envconfig:"DRONE_COMMIT_AFTER"`
Ref string `envconfig:"DRONE_COMMIT_REF"`
Branch string `envconfig:"DRONE_COMMIT_BRANCH"`
Source string `envconfig:"DRONE_COMMIT_SOURCE"`
Target string `envconfig:"DRONE_COMMIT_TARGET"`
Link string `envconfig:"DRONE_COMMIT_LINK"`
Message string `envconfig:"DRONE_COMMIT_MESSAGE"`
Author struct {
Username string `envconfig:"DRONE_COMMIT_AUTHOR"`
Name string `envconfig:"DRONE_COMMIT_AUTHOR_NAME"`
Email string `envconfig:"DRONE_COMMIT_AUTHOR_EMAIL"`
Avatar string `envconfig:"DRONE_COMMIT_AUTHOR_AVATAR"`
}
}
// Deploy provides the deployment metadata.
Deploy struct {
ID string `envconfig:"DRONE_DEPLOY_TO"`
Target string `envconfig:"DRONE_DEPLOY_ID"`
}
// Failed provides a list of failed steps and failed stages
// for the current pipeline.
Failed struct {
Steps []string `envconfig:"DRONE_FAILED_STEPS"`
Stages []string `envconfig:"DRONE_FAILED_STAGES"`
}
// Git provides the git repository metadata.
Git struct {
HTTPURL string `envconfig:"DRONE_GIT_HTTP_URL"`
SSHURL string `envconfig:"DRONE_GIT_SSH_URL"`
}
// PullRequest provides the pull request metadata.
PullRequest struct {
Number int `envconfig:"DRONE_PULL_REQUEST"`
}
// Repo provides the repository metadata.
Repo struct {
Branch string `envconfig:"DRONE_REPO_BRANCH"`
Link string `envconfig:"DRONE_REPO_LINK"`
Namespace string `envconfig:"DRONE_REPO_NAMESPACE"`
Name string `envconfig:"DRONE_REPO_NAME"`
Private bool `envconfig:"DRONE_REPO_PRIVATE"`
Remote string `envconfig:"DRONE_GIT_HTTP_URL"`
SCM string `envconfig:"DRONE_REPO_SCM"`
Slug string `envconfig:"DRONE_REPO"`
Visibility string `envconfig:"DRONE_REPO_VISIBILITY"`
}
// Stage provides the stage metadata.
Stage struct {
Kind string `envconfig:"DRONE_STAGE_KIND"`
Type string `envconfig:"DRONE_STAGE_TYPE"`
Name string `envconfig:"DRONE_STAGE_NAME"`
Number int `envconfig:"DRONE_STAGE_NUMBER"`
Machine string `envconfig:"DRONE_STAGE_MACHINE"`
OS string `envconfig:"DRONE_STAGE_OS"`
Arch string `envconfig:"DRONE_STAGE_ARCH"`
Variant string `envconfig:"DRONE_STAGE_VARIANT"`
Status string `envconfig:"DRONE_STAGE_STATUS"`
Started int64 `envconfig:"DRONE_STAGE_STARTED"`
Finished int64 `envconfig:"DRONE_STAGE_FINISHED"`
DependsOn []string `envconfig:"DRONE_STAGE_DEPENDS_ON"`
}
// Step provides the step metadata.
Step struct {
Number int `envconfig:"DRONE_STEP_NUMBER"`
Name string `envconfig:"DRONE_STEP_NAME"`
}
// Semver provides the semver details parsed from the
// git tag. If the git tag is empty or is not a valid
// semver, the values will be empty and the error field
// will be populated with the parsing error.
Semver struct {
Version string `envconfig:"DRONE_SEMVER"`
Short string `envconfig:"DRONE_SEMVER_SHORT"`
Major string `envconfig:"DRONE_SEMVER_MAJOR"`
Minor string `envconfig:"DRONE_SEMVER_MINOR"`
Patch string `envconfig:"DRONE_SEMVER_PATCH"`
Build string `envconfig:"DRONE_SEMVER_BUILD"`
PreRelease string `envconfig:"DRONE_SEMVER_PRERELEASE"`
Error string `envconfig:"DRONE_SEMVER_ERROR"`
}
// System provides the Drone system metadata, including
// the system version of details required to create the
// drone website address.
System struct {
Proto string `envconfig:"DRONE_SYSTEM_PROTO"`
Host string `envconfig:"DRONE_SYSTEM_HOST"`
Hostname string `envconfig:"DRONE_SYSTEM_HOSTNAME"`
Version string `envconfig:"DRONE_SYSTEM_VERSION"`
}
// Tag provides the git tag details.
Tag struct {
Name string `envconfig:"DRONE_TAG"`
}
}

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package plugin
import (
"context"
"fmt"
"os"
"os/exec"
"strings"
)
// Args provides plugin execution arguments.
type Args struct {
Pipeline
Level string `envconfig:"PLUGIN_LOG_LEVEL"`
SelectCatalogers []string `envconfig:"PLUGIN_SELECT_CATALOGERS"`
Output []string `envconfig:"PLUGIN_OUTPUT"`
SourceName string `envconfig:"PLUGIN_SOURCE_NAME"`
}
// Exec executes the plugin.
func Exec(ctx context.Context, args Args) error {
// Derive source version: prefer tag, fall back to commit SHA.
sourceVersion := args.Tag.Name
if sourceVersion == "" {
sourceVersion = args.Commit.Rev
}
cmdArgs := []string{"scan", "dir:."}
for _, c := range args.SelectCatalogers {
cmdArgs = append(cmdArgs, "--select-catalogers", c)
}
for _, o := range args.Output {
cmdArgs = append(cmdArgs, "--output", o)
}
if args.SourceName != "" {
cmdArgs = append(cmdArgs, "--source-name", args.SourceName)
}
if sourceVersion != "" {
cmdArgs = append(cmdArgs, "--source-version", sourceVersion)
}
cmd := exec.CommandContext(ctx, "syft", cmdArgs...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
trace(cmd)
if err := cmd.Run(); err != nil {
return err
}
return nil
}
// trace writes each command to stdout with the command wrapped in an xml
// tag so that it can be extracted and displayed in the logs.
func trace(cmd *exec.Cmd) {
fmt.Fprintf(os.Stdout, "+ %s\n", strings.Join(cmd.Args, " "))
}