From db2cca1129fa2d88eae80e1c4a17e263236a95a3 Mon Sep 17 00:00:00 2001
From: Otavio Salvador <otavio@ossystems.com.br>
Date: Sun, 16 Dec 2007 18:53:32 -0200
Subject: * apt-pkg/contrib/configuration.cc:   - if RootDir is set, then
 FindFile and FindDir will return paths     relative to the directory stored
 in RootDir, closes: #456457.

---
 apt-pkg/contrib/configuration.cc |  7 ++++++-
 debian/changelog                 |  5 +++++
 doc/apt.conf.5.xml               | 13 +++++++++++++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/apt-pkg/contrib/configuration.cc b/apt-pkg/contrib/configuration.cc
index 3109fd7a5..e8301d918 100644
--- a/apt-pkg/contrib/configuration.cc
+++ b/apt-pkg/contrib/configuration.cc
@@ -173,6 +173,11 @@ string Configuration::Find(const char *Name,const char *Default) const
  */
 string Configuration::FindFile(const char *Name,const char *Default) const
 {
+   const Item *RootItem = Lookup("RootDir");
+   std::string rootDir =  (RootItem == 0) ? "" : RootItem->Value;
+   if(rootDir.size() > 0 && rootDir[rootDir.size() - 1] != '/')
+     rootDir.push_back('/');
+
    const Item *Itm = Lookup(Name);
    if (Itm == 0 || Itm->Value.empty() == true)
    {
@@ -204,7 +209,7 @@ string Configuration::FindFile(const char *Name,const char *Default) const
       Itm = Itm->Parent;
    }
 
-   return val;
+   return rootDir + val;
 }
 									/*}}}*/
 // Configuration::FindDir - Find a directory name			/*{{{*/
diff --git a/debian/changelog b/debian/changelog
index 9ae68c770..d8ce744d6 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -47,6 +47,11 @@ apt (0.7.10) UNRELEASED; urgency=low
     - support lzma data members
   * ftparchive/multicompress.cc:
     - support lzma output
+  
+  [ Daniel Burrows ]
+  * apt-pkg/contrib/configuration.cc:
+    - if RootDir is set, then FindFile and FindDir will return paths
+      relative to the directory stored in RootDir, closes: #456457.
 
  -- Otavio Salvador <otavio@ossystems.com.br>  Sun, 16 Dec 2007 18:46:29 -0200
 
diff --git a/doc/apt.conf.5.xml b/doc/apt.conf.5.xml
index 43f33681f..5bc6c55db 100644
--- a/doc/apt.conf.5.xml
+++ b/doc/apt.conf.5.xml
@@ -295,6 +295,19 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
    <literal>dpkg</literal>, <literal>apt-get</literal> <literal>dpkg-source</literal> 
    <literal>dpkg-buildpackage</literal> and <literal>apt-cache</literal> specify the location
    of the respective programs.</para>
+
+   <para>
+     The configuration item <literal>RootDir</literal> has a special
+     meaning.  If set, all paths in <literal>Dir::</literal> will be
+     relative to <literal>RootDir</literal>, <emphasis>even paths that
+     are specified absolutely</emphasis>.  So, for instance, if
+     <literal>RootDir</literal> is set to
+     <filename>/tmp/staging</filename> and
+     <literal>Dir::State::status</literal> is set to
+     <filename>/var/lib/dpkg/status</filename>, then the status file
+     will be looked up in
+     <filename>/tmp/staging/var/lib/dpkg/status</filename>.
+   </para>
  </refsect1>
  
  <refsect1><title>APT in DSelect</title>
-- 
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