harness-drone/parser/trans.go

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package parser
import (
"strings"
"github.com/drone/drone/common"
)
// transformRule applies a check or transformation rule
// to the build configuration.
type transformRule func(*common.Config)
// Transform executes the default transformers that
// ensure the minimal Yaml configuration is in place
// and correctly configured.
func Transform(c *common.Config) {
transformSetup(c)
transformClone(c)
transformBuild(c)
transformImages(c)
transformDockerPlugin(c)
}
// TransformSafe executes all transformers that remove
// privileged options from the Yaml.
func TransformSafe(c *common.Config) {
rmPrivileged(c)
rmVolumes(c)
rmNetwork(c)
}
// transformSetup is a transformer that adds a default
// setup step if none exists.
func transformSetup(c *common.Config) {
c.Setup = &common.Step{}
c.Setup.Image = "plugins/drone-build"
c.Setup.Config = c.Build.Config
}
// transformClone is a transformer that adds a default
// clone step if none exists.
func transformClone(c *common.Config) {
if c.Clone == nil {
c.Clone = &common.Step{}
}
if len(c.Clone.Image) == 0 {
c.Clone.Image = "plugins/drone-git"
c.Clone.Volumes = nil
c.Clone.NetworkMode = ""
}
if c.Clone.Config == nil {
c.Clone.Config = map[string]interface{}{}
c.Clone.Config["depth"] = 50
c.Clone.Config["recursive"] = true
}
}
// transformBuild is a transformer that removes the
// build configuration vargs. They should have
// already been transferred to the Setup step.
func transformBuild(c *common.Config) {
c.Build.Config = nil
c.Build.Entrypoint = []string{"/bin/bash", "-e"}
c.Build.Command = []string{"/drone/bin/build.sh"}
}
// transformImages is a transformer that ensures every
// step has an image and uses a fully-qualified
// image name.
func transformImages(c *common.Config) {
c.Setup.Image = imageName(c.Setup.Image)
c.Clone.Image = imageName(c.Clone.Image)
for name, step := range c.Publish {
step.Image = imageNameDefault(step.Image, name)
}
for name, step := range c.Deploy {
step.Image = imageNameDefault(step.Image, name)
}
for name, step := range c.Notify {
step.Image = imageNameDefault(step.Image, name)
}
}
// transformDockerPlugin is a transformer that ensures the
// official Docker plugin can runs in privileged mode. It
// will disable volumes and network mode for added protection.
func transformDockerPlugin(c *common.Config) {
for _, step := range c.Publish {
if step.Image == "plugins/drone-docker" {
step.Privileged = true
step.Volumes = nil
step.NetworkMode = ""
step.Entrypoint = []string{}
break
}
}
}
// rmPrivileged is a transformer that ensures every
// step is executed in non-privileged mode.
func rmPrivileged(c *common.Config) {
c.Setup.Privileged = false
c.Clone.Privileged = false
c.Build.Privileged = false
for _, step := range c.Publish {
if step.Image == "plugins/drone-docker" {
continue // the official docker plugin is the only exception here
}
step.Privileged = false
}
for _, step := range c.Deploy {
step.Privileged = false
}
for _, step := range c.Notify {
step.Privileged = false
}
for _, step := range c.Compose {
step.Privileged = false
}
}
// rmVolumes is a transformer that ensures every
// step is executed without volumes.
func rmVolumes(c *common.Config) {
c.Setup.Volumes = nil
c.Clone.Volumes = nil
c.Build.Volumes = nil
for _, step := range c.Publish {
step.Volumes = nil
}
for _, step := range c.Deploy {
step.Volumes = nil
}
for _, step := range c.Notify {
step.Volumes = nil
}
for _, step := range c.Compose {
step.Volumes = nil
}
}
// rmNetwork is a transformer that ensures every
// step is executed with default bridge networking.
func rmNetwork(c *common.Config) {
c.Setup.NetworkMode = ""
c.Clone.NetworkMode = ""
c.Build.NetworkMode = ""
for _, step := range c.Publish {
step.NetworkMode = ""
}
for _, step := range c.Deploy {
step.NetworkMode = ""
}
for _, step := range c.Notify {
step.NetworkMode = ""
}
for _, step := range c.Compose {
step.NetworkMode = ""
}
}
// imageName is a helper function that resolves the
// image name. When using official drone plugins it
// is possible to use an alias name. This converts to
// the fully qualified name.
func imageName(name string) string {
if strings.Contains(name, "/") {
return name
}
name = strings.Replace(name, "_", "-", -1)
name = "plugins/drone-" + name
return name
}
// imageNameDefault is a helper function that resolves
// the image name. If the image name is blank the
// default name is used instead.
func imageNameDefault(name, defaultName string) string {
if len(name) == 0 {
name = defaultName
}
return imageName(name)
}