* merged lp:~mvo/apt/mvo, this brings two new commands:

  - apt-get download binary-pkgname to download a deb
  - apt-get changelog binary-pkgname to display the changelog

8 files changed, 320 insertions, 46 deletions

diff --git a/apt-pkg/contrib/strutl.cc b/apt-pkg/contrib/strutl.cc
index 987f4c3a4..c2b335ed7 100644
--- a/apt-pkg/contrib/strutl.cc
+++ b/apt-pkg/contrib/strutl.cc
@@ -1174,6 +1174,15 @@ char *safe_snprintf(char *Buffer,char *End,const char *Format,...)
    return Buffer + Did;
 }
 									/*}}}*/
+// StripEpoch - Remove the version "epoch" from a version string	/*{{{*/
+// ---------------------------------------------------------------------
+string StripEpoch(const string &VerStr)
+{
+   size_t i = VerStr.find(":");
+   if (i == string::npos)
+      return VerStr;
+   return VerStr.substr(i+1);
+}
 
 // tolower_ascii - tolower() function that ignores the locale		/*{{{*/
 // ---------------------------------------------------------------------
diff --git a/apt-pkg/contrib/strutl.h b/apt-pkg/contrib/strutl.h
index a457ff047..14cf5c943 100644
--- a/apt-pkg/contrib/strutl.h
+++ b/apt-pkg/contrib/strutl.h
@@ -61,6 +61,7 @@ void strprintf(string &out,const char *format,...) __like_printf(2);
 char *safe_snprintf(char *Buffer,char *End,const char *Format,...) __like_printf(3);
 bool CheckDomainList(const string &Host, const string &List);
 int tolower_ascii(int const c) __attrib_const __hot;
+string StripEpoch(const string &VerStr);
 
 #define APT_MKSTRCMP(name,func) \
 inline int name(const char *A,const char *B) {return func(A,A+strlen(A),B,B+strlen(B));}; \
diff --git a/cmdline/apt-get.cc b/cmdline/apt-get.cc
index 8efcd0e2e..0c7100283 100644
--- a/cmdline/apt-get.cc
+++ b/cmdline/apt-get.cc
@@ -2165,6 +2165,60 @@ bool DoAutoClean(CommandLine &CmdL)
       Cleaner.Go(_config->FindDir("Dir::Cache::archives") + "partial/",*Cache);
 }
 									/*}}}*/
+// DoDownload - download a binary					/*{{{*/
+// ---------------------------------------------------------------------
+bool DoDownload(CommandLine &CmdL)
+{
+   CacheFile Cache;
+   if (Cache.ReadOnlyOpen() == false)
+      return false;
+   
+   APT::CacheSetHelper helper(c0out);
+   APT::VersionSet verset = APT::VersionSet::FromCommandLine(Cache,
+		CmdL.FileList + 1, APT::VersionSet::CANDIDATE, helper);
+   pkgAcquire Fetcher;
+   AcqTextStatus Stat(ScreenWidth, _config->FindI("quiet",0));
+   Fetcher.Setup(&Stat);
+
+   if (verset.empty() == true)
+      return false;
+
+   bool result = true;
+   pkgRecords Recs(Cache);
+   pkgSourceList *SrcList = Cache.GetSourceList();
+   for (APT::VersionSet::const_iterator Ver = verset.begin(); 
+        Ver != verset.end(); 
+        ++Ver) 
+   {
+      string descr;
+      // get the right version
+      pkgCache::PkgIterator Pkg = Ver.ParentPkg();
+      pkgRecords::Parser &rec=Recs.Lookup(Ver.FileList());
+      pkgCache::VerFileIterator Vf = Ver.FileList();
+      if (Vf.end() == true)
+         return _error->Error("Can not find VerFile");
+      pkgCache::PkgFileIterator F = Vf.File();
+      pkgIndexFile *index;
+      if(SrcList->FindIndex(F, index) == false)
+         return _error->Error("FindIndex failed");
+      string uri = index->ArchiveURI(rec.FileName());
+      strprintf(descr, _("Downloading %s %s"), Pkg.Name(), Ver.VerStr());
+      // get the most appropriate hash
+      HashString hash;
+      if (rec.SHA256Hash() != "")
+         hash = HashString("sha256", rec.SHA256Hash());
+      else if (rec.SHA1Hash() != "")
+         hash = HashString("sha1", rec.SHA1Hash());
+      else if (rec.MD5Hash() != "")
+         hash = HashString("md5", rec.MD5Hash());
+      // get the file
+      new pkgAcqFile(&Fetcher, uri, hash.toStr(), (*Ver)->Size, descr, Pkg.Name(), ".");
+      result &= (Fetcher.Run() == pkgAcquire::Continue);
+   }
+
+   return result;
+}
+									/*}}}*/
 // DoCheck - Perform the check operation				/*{{{*/
 // ---------------------------------------------------------------------
 /* Opening automatically checks the system, this command is mostly used
@@ -2733,6 +2787,168 @@ bool DoBuildDep(CommandLine &CmdL)
    return true;
 }
 									/*}}}*/
+// GetChangelogPath - return a path pointing to a changelog file or dir /*{{{*/
+// ---------------------------------------------------------------------
+/* This returns a "path" string for the changelog url construction.
+ * Please note that its not complete, it either needs a "/changelog"
+ * appended (for the packages.debian.org/changelogs site) or a
+ * ".changelog" (for third party sites that store the changelog in the
+ * pool/ next to the deb itself)
+ * Example return: "pool/main/a/apt/apt_0.8.8ubuntu3" 
+ */
+string GetChangelogPath(CacheFile &Cache, 
+                        pkgCache::PkgIterator Pkg,
+                        pkgCache::VerIterator Ver)
+{
+   string path;
+
+   pkgRecords Recs(Cache);
+   pkgRecords::Parser &rec=Recs.Lookup(Ver.FileList());
+   string srcpkg = rec.SourcePkg().empty() ? Pkg.Name() : rec.SourcePkg();
+   // FIXME: deal with cases like gcc-defaults (srcver != binver)
+   string srcver = StripEpoch(Ver.VerStr());
+   path = flNotFile(rec.FileName());
+   path += srcpkg + "_" + srcver;
+   return path;
+}
+									/*}}}*/
+// GuessThirdPartyChangelogUri - return url 			        /*{{{*/
+// ---------------------------------------------------------------------
+/* Contruct a changelog file path for third party sites that do not use
+ * packages.debian.org/changelogs
+ * This simply uses the ArchiveURI() of the source pkg and looks for
+ * a .changelog file there, Example for "mediabuntu":
+ * apt-get changelog mplayer-doc:
+ *  http://packages.medibuntu.org/pool/non-free/m/mplayer/mplayer_1.0~rc4~try1.dsfg1-1ubuntu1+medibuntu1.changelog
+ */
+bool GuessThirdPartyChangelogUri(CacheFile &Cache, 
+                                 pkgCache::PkgIterator Pkg,
+                                 pkgCache::VerIterator Ver,
+                                 string &out_uri)
+{
+   // get the binary deb server path
+   pkgCache::VerFileIterator Vf = Ver.FileList();
+   if (Vf.end() == true)
+      return false;
+   pkgCache::PkgFileIterator F = Vf.File();
+   pkgIndexFile *index;
+   pkgSourceList *SrcList = Cache.GetSourceList();
+   if(SrcList->FindIndex(F, index) == false)
+      return false;
+
+   // get archive uri for the binary deb
+   string path_without_dot_changelog = GetChangelogPath(Cache, Pkg, Ver);
+   out_uri = index->ArchiveURI(path_without_dot_changelog + ".changelog");
+
+   // now strip away the filename and add srcpkg_srcver.changelog
+   return true;
+}
+// DownloadChangelog - Download the changelog 			        /*{{{*/
+// ---------------------------------------------------------------------
+bool DownloadChangelog(CacheFile &CacheFile, pkgAcquire &Fetcher, 
+                       pkgCache::VerIterator Ver, string targetfile)
+/* Download a changelog file for the given package version to
+ * targetfile. This will first try the server from Apt::Changelogs::Server
+ * (http://packages.debian.org/changelogs by default) and if that gives
+ * a 404 tries to get it from the archive directly (see 
+ * GuessThirdPartyChangelogUri for details how)
+ */
+{
+   string srcpkg;
+   string path;
+   string descr;
+   string server;
+   string changelog_uri;
+
+   // data structures we need
+   pkgCache::PkgIterator Pkg = Ver.ParentPkg();
+
+   // make the server root configurable
+   server = _config->Find("Apt::Changelogs::Server",
+                          "http://packages.debian.org/changelogs");
+   path = GetChangelogPath(CacheFile, Pkg, Ver);
+   strprintf(changelog_uri, "%s/%s/changelog", server.c_str(), path.c_str());
+   strprintf(descr, _("Changelog for %s (%s)"), srcpkg.c_str(), changelog_uri.c_str());
+   // queue it
+   new pkgAcqFile(&Fetcher, changelog_uri, "", 0, descr, srcpkg, "ignored", targetfile);
+
+   // try downloading it, if that fails, they third-party-changelogs location
+   // FIXME: res is "Continue" even if I get a 404?!?
+   int res = Fetcher.Run();
+   if (!FileExists(targetfile))
+   {
+      string third_party_uri;
+      if (GuessThirdPartyChangelogUri(CacheFile, Pkg, Ver, third_party_uri))
+      {
+         strprintf(descr, _("Changelog for %s (%s)"), srcpkg.c_str(), third_party_uri.c_str());
+         new pkgAcqFile(&Fetcher, third_party_uri, "", 0, descr, srcpkg, "ignored", targetfile);
+         res = Fetcher.Run();
+      }
+   }
+
+   if (FileExists(targetfile))
+      return true;
+
+   // error
+   return _error->Error("changelog download failed");
+}
+									/*}}}*/
+// DisplayFileInPager - Display File with pager        			/*{{{*/
+void DisplayFileInPager(string filename)
+{
+   pid_t Process = ExecFork();
+   if (Process == 0)
+   {
+      const char *Args[3];
+      Args[0] = "/usr/bin/sensible-pager";
+      Args[1] = filename.c_str();
+      Args[2] = 0;
+      execvp(Args[0],(char **)Args);
+      exit(100);
+   }
+         
+   // Wait for the subprocess
+   ExecWait(Process, "sensible-pager", false);
+}
+									/*}}}*/
+// DoChangelog - Get changelog from the command line			/*{{{*/
+// ---------------------------------------------------------------------
+bool DoChangelog(CommandLine &CmdL)
+{
+   CacheFile Cache;
+   if (Cache.ReadOnlyOpen() == false)
+      return false;
+   
+   APT::CacheSetHelper helper(c0out);
+   APT::VersionSet verset = APT::VersionSet::FromCommandLine(Cache,
+		CmdL.FileList + 1, APT::VersionSet::CANDIDATE, helper);
+   pkgAcquire Fetcher;
+   AcqTextStatus Stat(ScreenWidth, _config->FindI("quiet",0));
+   Fetcher.Setup(&Stat);
+
+   if (verset.empty() == true)
+      return false;
+   char *tmpdir = mkdtemp(strdup("/tmp/apt-changelog-XXXXXX"));
+   if (tmpdir == NULL) {
+      return _error->Errno("mkdtemp", "mkdtemp failed");
+   }
+   
+   for (APT::VersionSet::const_iterator Ver = verset.begin(); 
+        Ver != verset.end(); 
+        ++Ver) 
+   {
+      string changelogfile = string(tmpdir) + "changelog";
+      if (DownloadChangelog(Cache, Fetcher, Ver, changelogfile))
+         DisplayFileInPager(changelogfile);
+      // cleanup temp file
+      unlink(changelogfile.c_str());
+   }
+   // clenaup tmp dir
+   rmdir(tmpdir);
+   free(tmpdir);
+   return true;
+}
+									/*}}}*/
 // DoMoo - Never Ask, Never Tell					/*{{{*/
 // ---------------------------------------------------------------------
 /* */
@@ -2923,6 +3139,8 @@ int main(int argc,const char *argv[])					/*{{{*/
                                    {"autoclean",&DoAutoClean},
                                    {"check",&DoCheck},
 				   {"source",&DoSource},
+                                   {"download",&DoDownload},
+                                   {"changelog",&DoChangelog},
 				   {"moo",&DoMoo},
 				   {"help",&ShowHelp},
                                    {0,0}};
diff --git a/debian/apt.conf.changelog b/debian/apt.conf.changelog
index 3466bb6e0..7605c97d9 100644
--- a/debian/apt.conf.changelog
+++ b/debian/apt.conf.changelog
@@ -1,6 +1,6 @@
 // Server information for apt-changelog
 APT {
-  Changelog {
+  Changelogs {
     Server "http://changelogs.ubuntu.com/changelogs";
   }
 }
diff --git a/debian/changelog b/debian/changelog
index 0e9332f8d..3b2746e2d 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,9 @@
 apt (0.8.9ubuntu1) UNRELEASED; urgency=low
 
   * re-merged from the debian-sid bzr branch
+  * merged lp:~mvo/apt/mvo, this brings two new commands:
+    - apt-get download binary-pkgname to download a deb
+    - apt-get changelog binary-pkgname to display the changelog
 
  -- Michael Vogt <michael.vogt@ubuntu.com>  Thu, 18 Nov 2010 09:58:08 +0100
 
diff --git a/doc/examples/configure-index b/doc/examples/configure-index
index c4c2acb64..b87251103 100644
--- a/doc/examples/configure-index
+++ b/doc/examples/configure-index
@@ -114,54 +114,62 @@ APT
   // does a ExecFork)
   Keep-Fds {};
 
+  Changelogs
+  {
+    // server the provides the changelogs, the code will assume
+    // the changlogs are in the pool/ under a srcpkg_ver directory 
+    // with the name "changelog"
+    Server "http://packages.debian.org/changelogs";
+  }:
+
   // control parameters for cron jobs by /etc/cron.daily/apt
   Periodic
   {
-  BackupArchiveInterval "0";
-  // - Backup after n-days if archive contents changed.(0=disable)
-
-  BackupLevel "3";
-  // - Backup level.(0=disable), 1 is invalid.
-
-  // APT::Archives::MaxAge "0"; (old, deprecated)
-  MaxAge "0"; // (new)
-  // - Set maximum allowed age of a cache package file. If a cache 
-  //   package file is older it is deleted (0=disable)
-
-  // APT::Archives::MinAge "2"; (old, deprecated)
-  MinAge "2"; // (new)
-  // - Set minimum age of a package file. If a file is younger it
-  //   will not be deleted (0=disable). Usefull to prevent races 
-  //   and to keep backups of the packages for emergency.
-
-  // APT::Archives::MaxSize "0"; (old, deprecated)
-  MaxSize "0"; // (new)
-  // - Set maximum size of the cache in MB (0=disable). If the cache
-  //   is bigger, cached package files are deleted until the size
-  //   requirement is met (the biggest packages will be deleted 
-  //   first).
-
-  Update-Package-Lists "0";
-  // - Do "apt-get update" automatically every n-days (0=disable)
-  //   
-  Download-Upgradeable-Packages "0";
-  // - Do "apt-get upgrade --download-only" every n-days (0=disable)
-  //
-  Unattended-Upgrade "0";
-  // - Run the "unattended-upgrade" security upgrade script 
-  //   every n-days (0=disabled)
-  //   Requires the package "unattended-upgrades" and will write
-  //   a log in /var/log/unattended-upgrades
-  //
-  AutocleanInterval "0";
-  // - Do "apt-get autoclean" every n-days (0=disable)
-
-  Verbose "0";
-  // - Send report mail to root
-  //   0:  no report             (or null string)
-  //   1:  progress report       (actually any string)
-  //   2:  + command outputs     (remove -qq, remove 2>/dev/null, add -d)
-  //   3:  + trace on            
+    BackupArchiveInterval "0";
+    // - Backup after n-days if archive contents changed.(0=disable)
+
+    BackupLevel "3";
+    // - Backup level.(0=disable), 1 is invalid.
+
+    // APT::Archives::MaxAge "0"; (old, deprecated)
+    MaxAge "0"; // (new)
+    // - Set maximum allowed age of a cache package file. If a cache 
+    //   package file is older it is deleted (0=disable)
+
+    // APT::Archives::MinAge "2"; (old, deprecated)
+    MinAge "2"; // (new)
+    // - Set minimum age of a package file. If a file is younger it
+    //   will not be deleted (0=disable). Usefull to prevent races 
+    //   and to keep backups of the packages for emergency.
+
+    // APT::Archives::MaxSize "0"; (old, deprecated)
+    MaxSize "0"; // (new)
+    // - Set maximum size of the cache in MB (0=disable). If the cache
+    //   is bigger, cached package files are deleted until the size
+    //   requirement is met (the biggest packages will be deleted 
+    //   first).
+
+    Update-Package-Lists "0";
+    // - Do "apt-get update" automatically every n-days (0=disable)
+    //   
+    Download-Upgradeable-Packages "0";
+    // - Do "apt-get upgrade --download-only" every n-days (0=disable)
+    //
+    Unattended-Upgrade "0";
+    // - Run the "unattended-upgrade" security upgrade script 
+    //   every n-days (0=disabled)
+    //   Requires the package "unattended-upgrades" and will write
+    //   a log in /var/log/unattended-upgrades
+    //
+    AutocleanInterval "0";
+    // - Do "apt-get autoclean" every n-days (0=disable)
+
+    Verbose "0";
+    // - Send report mail to root
+    //   0:  no report             (or null string)
+    //   1:  progress report       (actually any string)
+    //   2:  + command outputs     (remove -qq, remove 2>/dev/null, add -d)
+    //   3:  + trace on            
   };
 };
 
diff --git a/test/integration/framework b/test/integration/framework
index 2422f0886..f78ae2ee1 100644
--- a/test/integration/framework
+++ b/test/integration/framework
@@ -117,6 +117,7 @@ setupenvironment() {
 	echo "Debug::NoLocking \"true\";" >> aptconfig.conf
 	echo "APT::Get::Show-User-Simulation-Note \"false\";" >> aptconfig.conf
 	echo "Dir::Bin::dpkg \"fakeroot\";" >> aptconfig.conf
+	echo "Dir::Bin::methods \"${BUILDDIRECTORY}/methods\";" >> aptconfig.conf
 	echo "DPKG::options:: \"dpkg\";" >> aptconfig.conf
 	echo "DPKG::options:: \"--root=${TMPWORKINGDIRECTORY}/rootdir\";" >> aptconfig.conf
 	echo "DPKG::options:: \"--force-not-root\";" >> aptconfig.conf
diff --git a/test/integration/test-changelog b/test/integration/test-changelog
new file mode 100755
index 000000000..292df6e32
--- /dev/null
+++ b/test/integration/test-changelog
@@ -0,0 +1,34 @@
+#!/bin/sh
+set -e
+
+TESTDIR=$(readlink -f $(dirname $0))
+. $TESTDIR/framework
+
+setupenvironment
+configarchitecture "i386"
+
+# this will be valid until ubuntu lucid is EOL (04/2015)
+pkgchangelogtest="Package: apt
+Architecture: i386
+Version: 0.7.25.3ubuntu7
+Filename: pool/main/a/apt/apt_0.7.25.3ubuntu7_i386.deb
+Section: admin
+"
+cat <<-EOF >aptarchive/Packages
+$pkgchangelogtest
+EOF
+
+setupaptarchive
+
+echo "Apt::Changelogs::Server \"http://changelogs.ubuntu.com/\";" >> ./aptconfig.conf
+msgnmsg "apt-get changelog: "
+aptget changelog apt -qq > downloaded-changelog
+expected="apt (0.7.25.3ubuntu7) lucid; urgency=low"
+got="$(head -n1 downloaded-changelog)"
+if [ -s downloaded-changelog ] && [ "$got" = "$expected" ]; then
+    msgpass
+else
+    msgfail 
+    msgwarn "$got != $expected"
+fi
+