[PATCH] write the daemon's pid to a file.

[John Darrington <john@darrington.wattle.id.au>]

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I don't know what you will think of this patch.  But I found that it makes 
running guix under debian a whole lot easier.  I suspect the same will be
true for many other OSes too.

J'


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From 20f5f5c28b773bb4e6164cd4e8df35ef62e3dffd Mon Sep 17 00:00:00 2001
From: John Darrington <john@darrington.wattle.id.au>
Date: Sat, 30 Nov 2013 15:30:48 +0100
Subject: [PATCH] guix-daemon: New option --pid-file=FILE

* Added a new option to write the daemon's pid to a file.  This is
necessary for the clean integration into sysV like systems such as
used by Debian and other vendors.
---
 nix/nix-daemon/guix-daemon.cc |    9 +++++++++
 nix/sync-with-upstream        |   16 ++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/nix/nix-daemon/guix-daemon.cc b/nix/nix-daemon/guix-daemon.cc
index 4f9fa4c..d703324 100644
--- a/nix/nix-daemon/guix-daemon.cc
+++ b/nix/nix-daemon/guix-daemon.cc
@@ -67,6 +67,7 @@ builds derivations on behalf of its clients.";
 #define GUIX_OPT_CHROOT_DIR 10
 #define GUIX_OPT_LISTEN 11
 #define GUIX_OPT_NO_SUBSTITUTES 12
+#define GUIX_OPT_PID_FILE 13
 
 static const struct argp_option options[] =
   {
@@ -94,6 +95,8 @@ static const struct argp_option options[] =
       "Perform builds as a user of GROUP" },
     { "no-substitutes", GUIX_OPT_NO_SUBSTITUTES, 0, 0,
       "Do not use substitutes" },
+    { "pid-file", GUIX_OPT_PID_FILE, "FILE", 0,
+      "Write the daemon's process ID to FILE" },
     { "cache-failures", GUIX_OPT_CACHE_FAILURES, 0, 0,
       "Cache build failures" },
     { "lose-logs", GUIX_OPT_LOSE_LOGS, 0, 0,
@@ -171,6 +174,9 @@ parse_opt (int key, char *arg, struct argp_state *state)
     case GUIX_OPT_SYSTEM:
       settings.thisSystem = arg;
       break;
+    case GUIX_OPT_PID_FILE:
+      settings.nixDaemonPidFile = arg;
+      break;
     default:
       return (error_t) ARGP_ERR_UNKNOWN;
     }
@@ -247,6 +253,9 @@ main (int argc, char *argv[])
       printMsg (lvlDebug,
 		format ("listening on `%1%'") % settings.nixDaemonSocketFile);
 
+      if (settings.nixDaemonPidFile != "")
+	writeFile (settings.nixDaemonPidFile, int2String(getpid()));
+
       run (nothing);
     }
   catch (std::exception &e)
diff --git a/nix/sync-with-upstream b/nix/sync-with-upstream
index 535763d..d60406f 100755
--- a/nix/sync-with-upstream
+++ b/nix/sync-with-upstream
@@ -70,3 +70,19 @@ cp -v "$top_srcdir/nix-upstream/AUTHORS" "$top_srcdir/nix"
 # Substitutions.
 sed -i "$top_srcdir/nix/libstore/gc.cc"					\
     -e 's|/nix/find-runtime-roots\.pl|/guix/list-runtime-roots|g'
+
+
+patch -p 1 << EOF
+--- a/nix/libstore/globals.hh	2013-11-30 18:13:33.000000000 +0100
++++ b/nix/libstore/globals.hh	2013-11-30 18:15:32.000000000 +0100
+@@ -53,6 +53,9 @@
+     /* File name of the socket the daemon listens to.  */
+     Path nixDaemonSocketFile;
+ 
++    /* File name of the to which the daemon PID will be written.  */
++    Path nixDaemonPidFile;
++
+     /* Whether to keep temporary directories of failed builds. */
+     bool keepFailed;
+EOF
+ 
-- 
1.7.10.4


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