From a18487c94e7a78dcede63bea1edf0b2dbfc49a51 Mon Sep 17 00:00:00 2001
From: Geoffrey Huntley <ghuntley@ghuntley.com>
Date: Wed, 16 Nov 2022 03:37:24 +0000
Subject: [PATCH] feat(freebsd): add support for freebsd

---
 coderd/util/tz/tz_freebsd.go | 43 ++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 coderd/util/tz/tz_freebsd.go

diff --git a/coderd/util/tz/tz_freebsd.go b/coderd/util/tz/tz_freebsd.go
new file mode 100644
index 0000000000000..1008edca2f556
--- /dev/null
+++ b/coderd/util/tz/tz_freebsd.go
@@ -0,0 +1,43 @@
+//go:build freebsd
+
+package tz
+
+import (
+	"path/filepath"
+	"strings"
+	"time"
+
+	"golang.org/x/xerrors"
+)
+
+const etcLocaltime = "/etc/localtime"
+const zoneInfoPath = "/usr/share/zoneinfo"
+
+// TimezoneIANA attempts to determine the local timezone in IANA format.
+// If the TZ environment variable is set, this is used.
+// Otherwise, /etc/localtime is used to determine the timezone.
+// Reference: https://stackoverflow.com/a/63805394
+// On Windows platforms, instead of reading /etc/localtime, powershell
+// is used instead to get the current time location in IANA format.
+// Reference: https://superuser.com/a/1584968
+func TimezoneIANA() (*time.Location, error) {
+	loc, err := locationFromEnv()
+	if err == nil {
+		return loc, nil
+	}
+	if !xerrors.Is(err, errNoEnvSet) {
+		return nil, xerrors.Errorf("lookup timezone from env: %w", err)
+	}
+
+	lp, err := filepath.EvalSymlinks(etcLocaltime)
+	if err != nil {
+		return nil, xerrors.Errorf("read location of %s: %w", etcLocaltime, err)
+	}
+	stripped := strings.Replace(lp, zoneInfoPath, "", -1)
+	stripped = strings.TrimPrefix(stripped, string(filepath.Separator))
+	loc, err = time.LoadLocation(stripped)
+	if err != nil {
+		return nil, xerrors.Errorf("invalid location %q guessed from %s: %w", stripped, lp, err)
+	}
+	return loc, nil
+}