Merge pull request #1280 from trapexit/getpid

Fix user.mergerfs.pid

README.md

@@ -251,7 +251,7 @@ These options are the same regardless of whether you use them with the
 * **flush-on-close=never|always|opened-for-write**: Flush data cache
   on file close. Mostly for when writeback is enabled or merging
   network filesystems. (default: opened-for-write)
-  * **scheduling-priority=INT**: Set mergerfs' scheduling
+* **scheduling-priority=INT**: Set mergerfs' scheduling
   priority. Valid values range from -20 to 19. See `setpriority` man
   page for more details. (default: -10)
 * **fsname=STR**: Sets the name of the filesystem as seen in

src/config.cpp

@@ -110,7 +110,6 @@ Config::Config()
     nfsopenhack(NFSOpenHack::ENUM::OFF),
     nullrw(false),
     parallel_direct_writes(false),
-    pid(::getpid()),
     posix_acl(false),
     readahead(0),
     readdir("seq"),

src/config.hpp

@@ -21,6 +21,7 @@
 #include "config_cachefiles.hpp"
 #include "config_flushonclose.hpp"
 #include "config_follow_symlinks.hpp"
+#include "config_pid.hpp"
 #include "config_inodecalc.hpp"
 #include "config_link_exdev.hpp"
 #include "config_log_metrics.hpp"
@@ -134,7 +135,7 @@ public:
   NFSOpenHack    nfsopenhack;
   ConfigBOOL     nullrw;
   ConfigBOOL     parallel_direct_writes;
-  ConfigUINT64   pid;
+  ConfigGetPid   pid;
   ConfigBOOL     posix_acl;
   ConfigUINT64   readahead;
   FUSE::ReadDir  readdir;

src/config_pid.hpp

@@ -0,0 +1,42 @@
+/*
+  ISC License
+
+  Copyright (c) 2023, Antonio SJ Musumeci <trapexit@spawn.link>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#pragma once
+
+#include "tofrom_string.hpp"
+#include "fmt/core.h"
+
+#include <sys/types.h>
+#include <unistd.h>
+
+
+class ConfigGetPid : public ToFromString
+{
+public:
+  std::string
+  to_string() const final
+  {
+    return fmt::format("{}",::getpid());
+  }
+
+  int
+  from_string(const std::string &) final
+  {
+    return -EROFS;
+  }
+};