83 lines
1.6 KiB
Go
83 lines
1.6 KiB
Go
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package transform
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import (
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"bytes"
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"encoding/base64"
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"fmt"
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"strings"
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"github.com/drone/drone/yaml"
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)
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// CommandTransform transforms the custom shell commands in the Yaml pipeline
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// into a container ENTRYPOINT and and CMD for execution.
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func CommandTransform(c *yaml.Config) error {
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for _, p := range c.Pipeline {
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if len(p.Commands) == 0 {
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continue
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}
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p.Entrypoint = []string{
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"/bin/sh", "-c",
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}
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p.Command = []string{
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"echo $DRONE_SCRIPT | base64 -d | /bin/sh -e",
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}
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if p.Environment == nil {
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p.Environment = map[string]string{}
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}
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p.Environment["HOME"] = "/root"
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p.Environment["SHELL"] = "/bin/sh"
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p.Environment["DRONE_SCRIPT"] = toScript(
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p.Commands,
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)
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}
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return nil
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}
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func toScript(commands []string) string {
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var buf bytes.Buffer
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for _, command := range commands {
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escaped := fmt.Sprintf("%q", command)
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escaped = strings.Replace(command, "$", `$\`, -1)
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buf.WriteString(fmt.Sprintf(
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traceScript,
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escaped,
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command,
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))
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}
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script := fmt.Sprintf(
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setupScript,
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buf.String(),
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)
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return base64.StdEncoding.EncodeToString([]byte(script))
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}
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// setupScript is a helper script this is added to the build to ensure
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// a minimum set of environment variables are set correctly.
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const setupScript = `
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if [ -n "$DRONE_NETRC_MACHINE" ]; then
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cat <<EOF > $HOME/.netrc
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machine $DRONE_NETRC_MACHINE
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login $DRONE_NETRC_USERNAME
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password $DRONE_NETRC_PASSWORD
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EOF
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fi
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unset DRONE_NETRC_USERNAME
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unset DRONE_NETRC_PASSWORD
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unset DRONE_SCRIPT
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%s
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`
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// traceScript is a helper script that is added to the build script
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// to trace a command.
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const traceScript = `
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echo + %s
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%s
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`
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