feat(metadata): allow users to specify variables (siderolabs#52)

.conform.yaml

@@ -1,5 +1,9 @@
 metadata:
   repository: autonomy/conform
+  variables:
+    binaryPath: /conform
+    gitRepository: github.com/autonomy/conform
+    maintainer: Andrew Rynhard <andrew.rynhard@autonomy.io>
 
 policies:
   - type: conventionalCommit
@@ -48,23 +52,27 @@ tasks:
   binary:
     template: |
       FROM autonomy/golang:1.9 as {{ .Docker.CurrentStage }}
-      WORKDIR $GOPATH/src/github.com/{{ .Repository }}
+      WORKDIR $GOPATH/src/{{ index .Variables "gitRepository" }}
       COPY ./ ./
       {{ if and .Git.IsClean .Git.IsTag }}
-      RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o /conform -ldflags "-X \"github.com/{{ .Repository }}/cmd.Tag={{ trimAll "v" .Git.Tag }}\" -X \"github.com/{{ .Repository }}/cmd.SHA={{ .Git.SHA }}\" -X \"github.com/{{ .Repository }}/cmd.Built={{ .Built }}\""
+      RUN go build -o {{ index .Variables "binaryPath" }} -ldflags "-X \"{{ index .Variables "gitRepository" }}/cmd.Tag={{ trimAll "v" .Git.Tag }}\" -X \"{{ index .Variables "gitRepository" }}/cmd.SHA={{ .Git.SHA }}\" -X \"{{ index .Variables "gitRepository" }}/cmd.Built={{ .Built }}\""
       {{ else if .Git.IsClean }}
-      RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o /conform -ldflags "-X \"github.com/{{ .Repository }}/cmd.SHA={{ .Git.SHA }}\" -X \"github.com/{{ .Repository }}/cmd.Built={{ .Built }}\""
+      RUN go build -o {{ index .Variables "binaryPath" }} -ldflags "-X \"{{ index .Variables "gitRepository" }}/cmd.SHA={{ .Git.SHA }}\" -X \"{{ index .Variables "gitRepository" }}/cmd.Built={{ .Built }}\""
       {{ else }}
-      RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o /conform
+      RUN go build -o {{ index .Variables "binaryPath" }}
       {{ end }}
   test:
     template: |
-      {{ fromURL "https://raw.githubusercontent.com/autonomy/conform-templates/master/golang/Dockerfile.test" }}
+      FROM autonomy/golang:1.9 as {{ .Docker.CurrentStage }}
+      WORKDIR $GOPATH/src/{{ index .Variables "gitRepository" }}
+      COPY ./ ./
+      RUN test.sh
+
   image:
     template: |
       FROM alpine:3.6 as {{ .Docker.CurrentStage }}
-      LABEL maintainer="Andrew Rynhard <andrew.rynhard@autonomy.io>"
+      LABEL maintainer="{{ index .Variables "maintainer" }}"
       RUN apk --update add bash \
           && rm -rf /var/cache/apk/*
-      COPY --from=binary /conform /bin
+      COPY --from=binary {{ index .Variables "binaryPath" }} /bin
       ENTRYPOINT ["conform"]

.travis.yml

@@ -5,7 +5,7 @@ language: generic
 
 install:
   - mkdir -p $HOME/goroot
-  - curl -L https://storage.googleapis.com/golang/go1.8.3.linux-amd64.tar.gz | tar -xz --strip-components=1 -C $HOME/goroot
+  - curl -L https://storage.googleapis.com/golang/go1.9.2.linux-amd64.tar.gz | tar -xz --strip-components=1 -C $HOME/goroot
   - export GOROOT=$HOME/goroot
   - export GOPATH=$HOME/gopath
   - export PATH=$GOROOT/bin:$GOPATH/bin:$PATH

cmd/enforce.go

@@ -16,6 +16,7 @@ package cmd
 import (
 	"fmt"
 	"os"
+	"strings"
 
 	"github.com/autonomy/conform/pkg/enforcer"
 	"github.com/autonomy/conform/pkg/utilities"
@@ -24,6 +25,7 @@ import (
 
 var (
 	skipArray []string
+	varArray  []string
 )
 
 // enforceCmd represents the enforce command
@@ -47,6 +49,13 @@ var enforceCmd = &cobra.Command{
 			fmt.Println(err)
 			os.Exit(1)
 		}
+		for _, variable := range varArray {
+			s := strings.Split(variable, "=")
+			if len(s) != 2 {
+				panic("interface{}")
+			}
+			e.Metadata.Variables[s[0]] = s[1]
+		}
 		for _, skip := range skipArray {
 			for i, stage := range e.Pipeline.Stages {
 				if stage == skip {
@@ -63,5 +72,6 @@ var enforceCmd = &cobra.Command{
 
 func init() {
 	RootCmd.AddCommand(enforceCmd)
-	enforceCmd.Flags().StringArrayVarP(&skipArray, "skip", "s", []string{}, "skip a stage in the pipeline")
+	enforceCmd.Flags().StringArrayVar(&skipArray, "skip", []string{}, "skip a stage in the pipeline")
+	enforceCmd.Flags().StringArrayVar(&varArray, "var", []string{}, "set a variable")
 }

pkg/metadata/metadata.go

@@ -14,6 +14,7 @@ type Metadata struct {
 	Docker     *Docker
 	Git        *Git
 	Version    *Version
+	Variables  VariablesMap `yaml:"variables"`
 	Built      string
 }
 
@@ -45,16 +46,21 @@ type Version struct {
 	IsPrerelease bool
 }
 
+// VariablesMap is a map for user defined metadata.
+type VariablesMap = map[string]interface{}
+
 // UnmarshalYAML implements the yaml.UnmarshalYAML interface.
 func (m *Metadata) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	var aux struct {
-		Repository string `yaml:"repository"`
+		Repository string       `yaml:"repository"`
+		Variables  VariablesMap `yaml:"variables"`
 	}
 	if err := unmarshal(&aux); err != nil {
 		return err
 	}
 
 	m.Repository = aux.Repository
+	m.Variables = aux.Variables
 	m.Built = time.Now().UTC().Format(time.RFC1123)
 
 	if err := addMetadataForGit(m); err != nil {