From 32e94931a78d558bb0837c05d7ee2d4a2a310478 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Thu, 6 Jun 2019 17:11:54 -0700
Subject: [PATCH] ircd::fs: Add ability to change basepath values at runtime.

---
 include/ircd/fs/path.h |  3 +++
 ircd/fs.cc             | 20 +++++++++++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/include/ircd/fs/path.h b/include/ircd/fs/path.h
index 3e3747d19..89e340c8a 100644
--- a/include/ircd/fs/path.h
+++ b/include/ircd/fs/path.h
@@ -62,12 +62,15 @@ namespace ircd::fs
 
 /// A compile-time installation base-path. We have several of these in an
 /// internal array accessible with get(enum base) or make_path(enum base).
+/// These can still be modified at runtime by setting a new platform-dependent
+/// string with set(enum base); do so with care.
 struct ircd::fs::basepath
 {
 	string_view name;
 	string_view path;
 
 	static const basepath &get(const base &) noexcept;
+	static string_view set(const base &, const string_view &); // (returns old value)
 };
 
 /// Index of default paths. Must be aligned with the internal array in fs.cc.
diff --git a/ircd/fs.cc b/ircd/fs.cc
index 87856392c..8778083db 100644
--- a/ircd/fs.cc
+++ b/ircd/fs.cc
@@ -2225,7 +2225,7 @@ catch(const filesystem::filesystem_error &e)
 
 namespace ircd::fs
 {
-	extern const std::array<basepath, num_of<base>()> basepaths;
+	extern std::array<basepath, num_of<base>()> basepaths;
 }
 
 decltype(ircd::fs::basepaths)
@@ -2240,6 +2240,24 @@ ircd::fs::basepaths
 	{ "module directory",         RB_MODULE_DIR  },
 }};
 
+ircd::string_view
+ircd::fs::basepath::set(const base &base,
+                        const string_view &path)
+{
+	log::debug
+	{
+		log, "Updating base path #%u '%s' from `%' to `%s'",
+		uint(base),
+		basepaths.at(base).name,
+		basepaths.at(base).path,
+		path,
+	};
+
+	const string_view ret(basepaths.at(base).path);
+	basepaths.at(base).path = path;
+	return ret;
+}
+
 const ircd::fs::basepath &
 ircd::fs::basepath::get(const base &base)
 noexcept