From ebcccbd3581d34d7fefb975c0255a39a3e39e122 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Wed, 19 Jul 2006 16:49:59 +0000
Subject: [PATCH] * Added a tool to find additional roots for the garbage
 collector,   such as open files, current directories, mmaped files, etc. 
 This is   inherently unportable, but it's easy to adapt this script to other 
  platforms.  Currently we call `lsof' and try to read various bits in  
 /proc/NNN.

  The goal is to prevent the garbage collector from removing store
  paths that are no longer reachable from a permanent root but that
  are still in use (for instance, after the user has done "nix-env -e"
  on a running program).
---
 scripts/Makefile.am              |  6 ++--
 scripts/find-runtime-roots.pl.in | 58 ++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+), 2 deletions(-)
 create mode 100644 scripts/find-runtime-roots.pl.in

diff --git a/scripts/Makefile.am b/scripts/Makefile.am
index bffbdbde5..7b0aef061 100644
--- a/scripts/Makefile.am
+++ b/scripts/Makefile.am
@@ -7,13 +7,14 @@ noinst_SCRIPTS = nix-profile.sh generate-patches.pl
 
 nix-pull nix-push: readmanifest.pm readconfig.pm download-using-manifests.pl
 
-install-exec-local: readmanifest.pm download-using-manifests.pl
+install-exec-local: readmanifest.pm download-using-manifests.pl find-runtime-roots.pl
 	$(INSTALL) -d $(DESTDIR)$(sysconfdir)/profile.d
 	$(INSTALL_PROGRAM) nix-profile.sh $(DESTDIR)$(sysconfdir)/profile.d/nix.sh
 	$(INSTALL) -d $(DESTDIR)$(libexecdir)/nix
 	$(INSTALL_DATA) readmanifest.pm $(DESTDIR)$(libexecdir)/nix 
 	$(INSTALL_DATA) readconfig.pm $(DESTDIR)$(libexecdir)/nix 
 	$(INSTALL_PROGRAM) download-using-manifests.pl $(DESTDIR)$(libexecdir)/nix 
+	$(INSTALL_PROGRAM) find-runtime-roots.pl $(DESTDIR)$(libexecdir)/nix 
 	$(INSTALL) -d $(DESTDIR)$(sysconfdir)/nix
 
 include ../substitute.mk
@@ -27,4 +28,5 @@ EXTRA_DIST = nix-collect-garbage.in \
   nix-build.in \
   download-using-manifests.pl.in \
   generate-patches.pl.in \
-  nix-pack-closure.in nix-unpack-closure.in
+  nix-pack-closure.in nix-unpack-closure.in \
+  find-runtime-roots.pl.in
diff --git a/scripts/find-runtime-roots.pl.in b/scripts/find-runtime-roots.pl.in
new file mode 100644
index 000000000..3e55ee445
--- /dev/null
+++ b/scripts/find-runtime-roots.pl.in
@@ -0,0 +1,58 @@
+#! @perl@ -w
+
+use strict;
+
+my $procDir = "/proc";
+
+
+sub readProc {
+    return unless -d $procDir;
+
+    opendir DIR, $procDir or return;
+    
+    foreach my $name (readdir DIR) {
+        next unless $name =~ /^\d+$/;
+
+        my $process = "$procDir/$name";
+
+        #print STDERR "=== $process\n";
+        
+        my $target;
+        print "$target\n" if $target = readlink "$process/exe";
+        print "$target\n" if $target = readlink "$process/cwd";
+
+        if (opendir FDS, "$process/fd") {
+            foreach my $name (readdir FDS) {
+                $target = readlink "$process/fd/$name";
+                print "$target\n" if $target && substr($target, 0, 1) eq "/";
+            }
+            closedir FDS;
+        }
+
+        if (open MAP, "<$process/maps") {
+            while (<MAP>) {
+                next unless /^ \s* \S+ \s+ \S+ \s+ \S+ \s+ \S+ \s+ \S+ \s+ (\/\S+) \s* $/x;
+                print "$1\n";
+            }
+            close MAP;
+        }
+    }
+
+    closedir DIR;
+}
+
+
+sub lsof {
+    return unless open LSOF, "lsof -b -w -F n |";
+
+    while (<LSOF>) {
+        next unless /^n (\/ .*)$/x;
+        print $1, "\n";
+    }
+
+    close LSOF;
+}
+
+
+readProc;
+lsof;