Configuration package (#369)

internal/configuration/system.go

@@ -0,0 +1,53 @@
+package configuration
+
+import (
+	"strconv"
+	"strings"
+
+	"github.com/qdm12/golibs/params"
+)
+
+// System contains settings to configure system related elements.
+type System struct {
+	PUID     int
+	PGID     int
+	Timezone string
+}
+
+func (settings *System) String() string {
+	return strings.Join(settings.lines(), "\n")
+}
+
+func (settings *System) lines() (lines []string) {
+	lines = append(lines, lastIndent+"System:")
+	lines = append(lines, indent+lastIndent+"Process user ID: "+strconv.Itoa(settings.PUID))
+	lines = append(lines, indent+lastIndent+"Process group ID: "+strconv.Itoa(settings.PGID))
+
+	if len(settings.Timezone) > 0 {
+		lines = append(lines, indent+lastIndent+"Timezone: "+settings.Timezone)
+	} else {
+		lines = append(lines, indent+lastIndent+"Timezone: NOT SET ⚠️ - it can cause time related issues")
+	}
+	return lines
+}
+
+func (settings *System) read(r reader) (err error) {
+	settings.PUID, err = r.env.IntRange("PUID", 0, 65535, params.Default("1000"),
+		params.RetroKeys([]string{"UID"}, r.onRetroActive))
+	if err != nil {
+		return err
+	}
+
+	settings.PGID, err = r.env.IntRange("PGID", 0, 65535, params.Default("1000"),
+		params.RetroKeys([]string{"GID"}, r.onRetroActive))
+	if err != nil {
+		return err
+	}
+
+	settings.Timezone, err = r.env.Get("TZ")
+	if err != nil {
+		return err
+	}
+
+	return nil
+}