105 lines
2.2 KiB
Go
105 lines
2.2 KiB
Go
// This is the main package for the `packer` application.
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package main
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import (
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"github.com/mitchellh/packer/packer"
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"github.com/mitchellh/packer/packer/plugin"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/user"
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"path"
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"runtime"
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)
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func loadGlobalConfig() (result *config, err error) {
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mustExist := true
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p := os.Getenv("PACKER_CONFIG")
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if p == "" {
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var u *user.User
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u, err = user.Current()
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if err != nil {
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return
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}
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p = path.Join(u.HomeDir, ".packerrc")
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mustExist = false
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}
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log.Printf("Loading packer config: %s\n", p)
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contents, err := ioutil.ReadFile(p)
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if err != nil && !mustExist {
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// Don't report an error if it is okay if the file is missing
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perr, ok := err.(*os.PathError)
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if ok && perr.Op == "open" {
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log.Printf("Packer config didn't exist. Ignoring: %s\n", p)
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err = nil
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}
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}
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if err != nil {
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return
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}
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result, err = parseConfig(string(contents))
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if err != nil {
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return
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}
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return
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}
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func main() {
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if os.Getenv("PACKER_LOG") == "" {
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// If we don't have logging explicitly enabled, then disable it
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log.SetOutput(ioutil.Discard)
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} else {
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// Logging is enabled, make sure it goes to stderr
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log.SetOutput(os.Stderr)
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}
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// If there is no explicit number of Go threads to use, then set it
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if os.Getenv("GOMAXPROCS") == "" {
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runtime.GOMAXPROCS(runtime.NumCPU())
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}
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defer plugin.CleanupClients()
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homeConfig, err := loadGlobalConfig()
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if err != nil {
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fmt.Fprintf(os.Stderr, "Error loading global Packer configuration: \n\n%s\n", err)
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os.Exit(1)
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}
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config, err := parseConfig(defaultConfig)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Error parsing global Packer configuration: \n\n%s\n", err)
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os.Exit(1)
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}
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if homeConfig != nil {
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log.Println("Merging default config with home config...")
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config = mergeConfig(config, homeConfig)
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}
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envConfig := packer.DefaultEnvironmentConfig()
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envConfig.Commands = config.CommandNames()
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envConfig.CommandFunc = config.LoadCommand
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env, err := packer.NewEnvironment(envConfig)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Packer initialization error: \n\n%s\n", err)
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os.Exit(1)
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}
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exitCode, err := env.Cli(os.Args[1:])
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if err != nil {
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fmt.Fprintf(os.Stderr, "Error executing CLI: %s\n", err.Error())
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os.Exit(1)
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}
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plugin.CleanupClients()
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os.Exit(exitCode)
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}
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