106 lines
2.8 KiB
Go
106 lines
2.8 KiB
Go
package command
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import (
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"bufio"
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"flag"
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"io"
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"os"
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kvflag "github.com/hashicorp/packer/command/flag-kv"
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"github.com/hashicorp/packer/helper/wrappedstreams"
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"github.com/hashicorp/packer/packer"
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packersdk "github.com/hashicorp/packer/packer-plugin-sdk/packer"
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"github.com/hashicorp/packer/packer-plugin-sdk/template"
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)
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// FlagSetFlags is an enum to define what flags are present in the
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// default FlagSet returned by Meta.FlagSet
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type FlagSetFlags uint
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const (
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FlagSetNone FlagSetFlags = 0
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FlagSetBuildFilter FlagSetFlags = 1 << iota
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FlagSetVars
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)
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// Meta contains the meta-options and functionality that nearly every
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// Packer command inherits.
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type Meta struct {
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CoreConfig *packer.CoreConfig
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Ui packersdk.Ui
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Version string
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}
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// Core returns the core for the given template given the configured
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// CoreConfig and user variables on this Meta.
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func (m *Meta) Core(tpl *template.Template, cla *MetaArgs) (*packer.Core, error) {
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// Copy the config so we don't modify it
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config := *m.CoreConfig
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config.Template = tpl
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fj := &kvflag.FlagJSON{}
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// First populate fj with contents from var files
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for _, file := range cla.VarFiles {
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err := fj.Set(file)
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if err != nil {
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return nil, err
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}
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}
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// Now read fj values back into flagvars and set as config.Variables. Only
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// add to flagVars if the key doesn't already exist, because flagVars comes
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// from the command line and should not be overridden by variable files.
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if cla.Vars == nil {
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cla.Vars = map[string]string{}
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}
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for k, v := range *fj {
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if _, exists := cla.Vars[k]; !exists {
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cla.Vars[k] = v
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}
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}
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config.Variables = cla.Vars
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core := packer.NewCore(&config)
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return core, nil
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}
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// FlagSet returns a FlagSet with the common flags that every
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// command implements. The exact behavior of FlagSet can be configured
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// using the flags as the second parameter, for example to disable
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// build settings on the commands that don't handle builds.
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func (m *Meta) FlagSet(n string, _ FlagSetFlags) *flag.FlagSet {
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f := flag.NewFlagSet(n, flag.ContinueOnError)
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// Create an io.Writer that writes to our Ui properly for errors.
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// This is kind of a hack, but it does the job. Basically: create
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// a pipe, use a scanner to break it into lines, and output each line
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// to the UI. Do this forever.
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errR, errW := io.Pipe()
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errScanner := bufio.NewScanner(errR)
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go func() {
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for errScanner.Scan() {
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m.Ui.Error(errScanner.Text())
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}
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}()
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f.SetOutput(errW)
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return f
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}
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// ValidateFlags should be called after parsing flags to validate the
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// given flags
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func (m *Meta) ValidateFlags() error {
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// TODO
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return nil
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}
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// StdinPiped returns true if the input is piped.
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func (m *Meta) StdinPiped() bool {
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fi, err := wrappedstreams.Stdin().Stat()
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if err != nil {
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// If there is an error, let's just say its not piped
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return false
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}
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return fi.Mode()&os.ModeNamedPipe != 0
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}
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