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// Package for processing environment variables.
package env
// TODO: we need to add tests for this package.
import (
"bufio"
"fmt"
"os"
"strings"
"github.com/pkg/errors"
)
const whiteSpaces = " \t"
// DefaultEnvVariables returns a default environment, with $PATH and $TERM set.
func DefaultEnvVariables() map[string]string {
return map[string]string{
"PATH": "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"TERM": "xterm",
}
}
// Slice transforms the specified map of environment variables into a
// slice. If a value is non-empty, the key and value are joined with '='.
func Slice(m map[string]string) []string {
env := make([]string, len(m))
for k, v := range m {
var s string
if len(v) > 0 {
s = fmt.Sprintf("%s=%s", k, v)
} else {
s = k
}
env = append(env, s)
}
return env
}
// Join joins the two environment maps with override overriding base.
func Join(base map[string]string, override map[string]string) map[string]string {
if len(base) == 0 {
return override
}
for k, v := range override {
base[k] = v
}
return base
}
// ParseFile parses the specified path for environment variables and returns them
// as a map.
func ParseFile(path string) (_ map[string]string, err error) {
env := make(map[string]string)
defer func() {
if err != nil {
err = errors.Wrapf(err, "error parsing env file %q", path)
}
}()
fh, err := os.Open(path)
if err != nil {
return nil, err
}
defer fh.Close()
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, "#") {
if err := parseEnv(env, line); err != nil {
return nil, err
}
}
}
return env, scanner.Err()
}
func parseEnv(env map[string]string, line string) error {
data := strings.SplitN(line, "=", 2)
// catch invalid variables such as "=" or "=A"
if data[0] == "" {
return errors.Errorf("invalid environment variable: %q", line)
}
// trim the front of a variable, but nothing else
name := strings.TrimLeft(data[0], whiteSpaces)
if strings.ContainsAny(name, whiteSpaces) {
return errors.Errorf("name %q has white spaces, poorly formatted name", name)
}
if len(data) > 1 {
env[name] = data[1]
} else {
if strings.HasSuffix(name, "*") {
name = strings.TrimSuffix(name, "*")
for _, e := range os.Environ() {
part := strings.SplitN(e, "=", 2)
if len(part) < 2 {
continue
}
if strings.HasPrefix(part[0], name) {
env[part[0]] = part[1]
}
}
} else if val, ok := os.LookupEnv(name); ok {
// if only a pass-through variable is given, clean it up.
env[name] = val
}
}
return nil
}
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