librc: read RC_SVCDIR from the environment

Author: navi-desu

src/librc/librc.c

@@ -730,7 +730,18 @@ rc_runleveldir(void)
 const char *
 rc_svcdir(void)
 {
-	return rc_dirs.set ? rc_dirs.svcdir : RC_SVCDIR;
+	static const char *svcdir;
+	static bool set = false;
+
+	if (rc_dirs.set)
+		return rc_dirs.svcdir;
+
+	if (!set && !rc_dirs.set) {
+		svcdir = getenv("RC_SVCDIR");
+		set = true;
+	}
+
+	return svcdir ? svcdir : RC_SVCDIR;
 }
 
 static ssize_t

src/shared/misc.c

@@ -59,7 +59,7 @@ static const char *const env_allowlist[] = {
 	"EERROR_QUIET", "EINFO_QUIET",
 	"IN_BACKGROUND", "IN_DRYRUN", "IN_HOTPLUG",
 	"RC_DEBUG", "RC_NODEPS", "RC_USER_SERVICES",
-	"RC_SCRIPTDIRS",
+	"RC_SCRIPTDIRS", "RC_SVCDIR",
 	"LANG", "LC_MESSAGES", "TERM",
 	"EINFO_COLOR", "EINFO_VERBOSE",
 	NULL