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env.go
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env.go
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package main
import (
"bufio"
"fmt"
"log"
"os"
"sort"
"strings"
)
var cmdEnv = &Command{
Run: runEnv,
Usage: "env",
NeedsApp: true,
Category: "config",
Short: "list env vars",
Long: `Show all env vars.`,
}
func runEnv(cmd *Command, args []string) {
if len(args) != 0 {
cmd.PrintUsage()
os.Exit(2)
}
config, err := client.ConfigVarInfo(mustApp())
must(err)
var configKeys []string
for k := range config {
configKeys = append(configKeys, k)
}
sort.Strings(configKeys)
for _, k := range configKeys {
fmt.Printf("%s=%s\n", k, config[k])
}
}
var cmdGet = &Command{
Run: runGet,
Usage: "get <name>",
NeedsApp: true,
Category: "config",
Short: "get env var" + extra,
Long: `
Get the value of an env var.
Example:
$ emp get BUILDPACK_URL
http://github.com/kr/heroku-buildpack-inline.git
`,
}
func runGet(cmd *Command, args []string) {
if len(args) != 1 {
cmd.PrintUsage()
os.Exit(2)
}
config, err := client.ConfigVarInfo(mustApp())
must(err)
value, found := config[args[0]]
if !found {
printFatal("No such key as '%s'", args[0])
}
fmt.Println(value)
}
var cmdSet = &Command{
Run: maybeMessage(runSet),
Usage: "set <name>=<value>...",
NeedsApp: true,
OptionalMessage: true,
Category: "config",
Short: "set env var",
Long: `
Set the value of an env var.
Example:
$ emp set BUILDPACK_URL=http://github.com/kr/heroku-buildpack-inline.git
Set env vars and restarted myapp.
`,
}
func runSet(cmd *Command, args []string) {
appname := mustApp()
message := getMessage()
if len(args) == 0 {
cmd.PrintUsage()
os.Exit(2)
}
config := make(map[string]*string)
for _, arg := range args {
i := strings.Index(arg, "=")
if i < 0 {
printFatal("bad format: %#q. See 'emp help set'", arg)
}
val := arg[i+1:]
config[arg[:i]] = &val
}
_, err := client.ConfigVarUpdate(appname, config, message)
must(err)
log.Printf("Set env vars and restarted " + appname + ".")
}
var cmdUnset = &Command{
Run: maybeMessage(runUnset),
Usage: "unset <name>...",
NeedsApp: true,
OptionalMessage: true,
Category: "config",
Short: "unset env var",
Long: `
Unset an env var.
Example:
$ emp unset BUILDPACK_URL
Unset env vars and restarted myapp.
`,
}
func runUnset(cmd *Command, args []string) {
appname := mustApp()
message := getMessage()
if len(args) == 0 {
cmd.PrintUsage()
os.Exit(2)
}
config := make(map[string]*string)
for _, key := range args {
config[key] = nil
}
_, err := client.ConfigVarUpdate(appname, config, message)
must(err)
log.Printf("Unset env vars and restarted %s.", appname)
}
var cmdEnvLoad = &Command{
Run: maybeMessage(runEnvLoad),
Usage: "env-load <file>",
NeedsApp: true,
OptionalMessage: true,
Category: "config",
Short: "load env file",
Long: `
Loads environment variables from a file.
Example:
$ emp env-load app.env
Set env vars from app.env and restarted myapp.
`,
}
func runEnvLoad(cmd *Command, args []string) {
appname := mustApp()
message := getMessage()
if len(args) != 1 {
cmd.PrintUsage()
os.Exit(2)
}
parsedVars, err := ParseEnvFile(args[0])
must(err)
config := make(map[string]*string)
for _, value := range parsedVars {
kv := strings.SplitN(value, "=", 2)
if len(kv) == 1 {
config[kv[0]] = new(string)
} else {
config[kv[0]] = &kv[1]
}
}
_, err = client.ConfigVarUpdate(appname, config, message)
must(err)
log.Printf("Updated env vars from %s and restarted %s.", args[0], appname)
}
// Stripped from https://github.com/docker/docker/blob/3d13fddd2bc4d679f0eaa68b0be877e5a816ad53/runconfig/opts/envfile.go
//
// ParseEnvFile reads a file with environment variables enumerated by lines
//
// ``Environment variable names used by the utilities in the Shell and
// Utilities volume of IEEE Std 1003.1-2001 consist solely of uppercase
// letters, digits, and the '_' (underscore) from the characters defined in
// Portable Character Set and do not begin with a digit. *But*, other
// characters may be permitted by an implementation; applications shall
// tolerate the presence of such names.''
// -- http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html
//
// As of #16585, it's up to application inside docker to validate or not
// environment variables, that's why we just strip leading whitespace and
// nothing more.
func ParseEnvFile(filename string) ([]string, error) {
fh, err := os.Open(filename)
if err != nil {
return []string{}, err
}
defer fh.Close()
lines := []string{}
scanner := bufio.NewScanner(fh)
for scanner.Scan() {
// trim the line from all leading whitespace first
line := strings.TrimLeft(scanner.Text(), whiteSpaces)
// line is not empty, and not starting with '#'
if len(line) > 0 && !strings.HasPrefix(line, "#") {
data := strings.SplitN(line, "=", 2)
// trim the front of a variable, but nothing else
variable := strings.TrimLeft(data[0], whiteSpaces)
if strings.ContainsAny(variable, whiteSpaces) {
return []string{}, ErrBadEnvVariable{fmt.Sprintf("variable '%s' has white spaces", variable)}
}
if len(data) > 1 {
// pass the value through, no trimming
lines = append(lines, fmt.Sprintf("%s=%s", variable, data[1]))
} else {
// if only a pass-through variable is given, clean it up.
lines = append(lines, fmt.Sprintf("%s=%s", strings.TrimSpace(line), os.Getenv(line)))
}
}
}
return lines, scanner.Err()
}
var whiteSpaces = " \t"
// ErrBadEnvVariable typed error for bad environment variable
type ErrBadEnvVariable struct {
msg string
}
func (e ErrBadEnvVariable) Error() string {
return fmt.Sprintf("poorly formatted environment: %s", e.msg)
}