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package datafs
import (
"io/fs"
"os"
"strings"
)
// ExpandEnvFsys - a convenience function intended for internal use only!
func ExpandEnvFsys(fsys fs.FS, s string) string {
return os.Expand(s, func(s string) string {
return GetenvFsys(fsys, s)
})
}
// GetenvFsys - a convenience function intended for internal use only!
func GetenvFsys(fsys fs.FS, key string, def ...string) string {
val, _ := getenvFile(fsys, key)
if val == "" && len(def) > 0 {
return def[0]
}
return val
}
// LookupEnvFsys - a convenience function intended for internal use only!
func LookupEnvFsys(fsys fs.FS, key string) (string, bool) {
return getenvFile(fsys, key)
}
func getenvFile(fsys fs.FS, key string) (string, bool) {
val, found := os.LookupEnv(key)
if val != "" {
return val, true
}
p := os.Getenv(key + "_FILE")
if p != "" {
val, err := readFile(fsys, p)
if err != nil {
return "", false
}
return strings.TrimSpace(val), true
}
return "", found
}
func readFile(fsys fs.FS, p string) (string, error) {
b, err := fs.ReadFile(fsys, p)
if err != nil {
return "", err
}
return string(b), nil
}
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