feat(config): Allow avoiding reading default config file (#2227)

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/env/env.go b/env/env.go
index 598361bf..16e121fc 100644
--- a/env/env.go
+++ b/env/env.go
@@ -20,3 +20,13 @@ func ExpandEnv(s string) string {
 	fsys := datafs.WrapWdFS(osfs.NewFS())
 	return datafs.ExpandEnvFsys(fsys, s)
 }
+
+// LookupEnv - retrieves the value of the environment variable named by the key.
+// If the variable is unset, but the same variable ending in `_FILE` is set, the
+// referenced file will be read into the value. If the key is not set, the
+// second return value will be false.
+// Otherwise the provided default (or an emptry string) is returned.
+func LookupEnv(key string) (string, bool) {
+	fsys := datafs.WrapWdFS(osfs.NewFS())
+	return datafs.LookupEnvFsys(fsys, key)
+}