From cc5c78374e320bc7807f04391b70e43deaa54c94 Mon Sep 17 00:00:00 2001
From: Joel Rosdahl <joel@rosdahl.net>
Date: Mon, 18 Jul 2022 14:19:44 +0200
Subject: [PATCH] feat(file-storage): Support server name in URL on Windows

---
 doc/MANUAL.adoc                       | 12 +++++++-----
 src/storage/secondary/FileStorage.cpp | 23 ++++++++++++++++-------
 2 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/doc/MANUAL.adoc b/doc/MANUAL.adoc
index fc0eb1c35..be147f68c 100644
--- a/doc/MANUAL.adoc
+++ b/doc/MANUAL.adoc
@@ -1074,15 +1074,16 @@ on cache hits and misses:
 <<config_reshare,*reshare*>> option.
 
 
-
 === File storage backend
 
-URL format: `+file:DIRECTORY+` or `+file://DIRECTORY+`
+URL format: `+file:DIRECTORY+` or `+file://[HOST]DIRECTORY+`
 
 This backend stores data as separate files in a directory structure below
-*DIRECTORY* (an absolute path), similar (but not identical) to the primary cache
-storage. A typical use case for this backend would be sharing a cache on an NFS
-directory.
+*DIRECTORY*, similar (but not identical) to the primary cache storage. A typical
+use case for this backend would be sharing a cache on an NFS directory.
+*DIRECTORY* must start with a slash. *HOST* can be the empty string or
+localhost. On Windows, *HOST* can also be the name of a server hosting a shared
+folder.
 
 IMPORTANT: ccache will not perform any cleanup of the storage -- that has to be
 done by other means, for instance by running `ccache --trim-dir` periodically.
@@ -1091,6 +1092,7 @@ Examples:
 
 * `+file:/shared/nfs/directory+`
 * `+file:///shared/nfs/directory|umask=002|update-mtime=true+`
+* `+file://example.com/shared/folder+`
 
 Optional attributes:
 
diff --git a/src/storage/secondary/FileStorage.cpp b/src/storage/secondary/FileStorage.cpp
index f1d550c34..8807ab407 100644
--- a/src/storage/secondary/FileStorage.cpp
+++ b/src/storage/secondary/FileStorage.cpp
@@ -55,7 +55,7 @@ public:
 private:
   enum class Layout { flat, subdirs };
 
-  const std::string m_dir;
+  std::string m_dir;
   std::optional<mode_t> m_umask;
   bool m_update_mtime = false;
   Layout m_layout = Layout::subdirs;
@@ -64,15 +64,24 @@ private:
 };
 
 FileStorageBackend::FileStorageBackend(const Params& params)
-  : m_dir(params.url.path())
 {
   ASSERT(params.url.scheme() == "file");
-  if (!params.url.host().empty()) {
-    throw core::Fatal(FMT(
-      "invalid file path \"{}\": specifying a host (\"{}\") is not supported",
-      params.url.str(),
-      params.url.host()));
+
+  const auto& host = params.url.host();
+#ifdef _WIN32
+  m_dir = util::replace_all(params.url.path(), "/", "\\");
+  if (!host.empty()) {
+    m_dir = FMT("\\\\{}\\{}", host, m_dir);
+  }
+#else
+  if (!host.empty() && host != "localhost") {
+    throw core::Fatal(
+      FMT("invalid file URL \"{}\": specifying a host other than localhost is"
+          " not supported",
+          params.url.str()));
   }
+  m_dir = params.url.path();
+#endif
 
   for (const auto& attr : params.attributes) {
     if (attr.key == "layout") {
-- 
2.47.3