rclone/lib/env/env.go

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// Package env contains functions for dealing with environment variables
package env
import (
"os"
"os/user"
homedir "github.com/mitchellh/go-homedir"
)
// ShellExpandHelp describes what ShellExpand does for inclusion into help
const ShellExpandHelp = "\n\nLeading `~` will be expanded in the file name as will environment variables such as `${RCLONE_CONFIG_DIR}`.\n"
// ShellExpand replaces a leading "~" with the home directory" and
// expands all environment variables afterwards.
func ShellExpand(s string) string {
if s != "" {
if s[0] == '~' {
newS, err := homedir.Expand(s)
if err == nil {
s = newS
}
}
s = os.ExpandEnv(s)
}
return s
}
// CurrentUser finds the current user name or "" if not found
func CurrentUser() (userName string) {
userName = os.Getenv("USER")
// If we are making docs just use $USER
if userName == "$USER" {
return userName
}
// Try reading using the OS
usr, err := user.Current()
if err == nil {
return usr.Username
}
// Fall back to reading $USER then $LOGNAME
if userName != "" {
return userName
}
return os.Getenv("LOGNAME")
}