require explicit paths to dsc/control as we do for deb files

Otherwise a user is subject to unexpected content-injection depending on
which directory she happens to start apt in. This also cleans up the code
requiring less implementation details in build-dep which is always good.

Technically, this is an ABI break as we override virtual methods, but
that they weren't overridden was a mistake resulting in pure classes,
which shouldn't be pure, so they were unusable – and as they are new in
1.1 nobody is using them yet (and hopefully ever as they are borderline
implementation details).

Closes: 806693

3 files changed, 36 insertions, 3 deletions

diff --git a/apt-pkg/deb/debindexfile.cc b/apt-pkg/deb/debindexfile.cc
index 708b40a96..c11efd0ae 100644
--- a/apt-pkg/deb/debindexfile.cc
+++ b/apt-pkg/deb/debindexfile.cc
@@ -278,6 +278,24 @@ pkgSrcRecords::Parser *debDscFileIndex::CreateSrcParser() const
       return NULL;
    return new debDscRecordParser(File, this);
 }
+std::string debDscFileIndex::GetComponent() const
+{
+   return "local-dsc";
+}
+std::string debDscFileIndex::GetArchitecture() const
+{
+   return "source";
+}
+uint8_t debDscFileIndex::GetIndexFlags() const
+{
+   return pkgCache::Flag::LocalSource;
+}
+									/*}}}*/
+// ControlFile Index - a directory with a debian/control file		/*{{{*/
+std::string debDebianSourceDirIndex::GetComponent() const
+{
+   return "local-control";
+}
 									/*}}}*/
 
 // Index File types for Debian						/*{{{*/
diff --git a/apt-pkg/deb/debindexfile.h b/apt-pkg/deb/debindexfile.h
index e96a4761e..890141dff 100644
--- a/apt-pkg/deb/debindexfile.h
+++ b/apt-pkg/deb/debindexfile.h
@@ -152,7 +152,13 @@ public:
 class debDscFileIndex : public pkgDebianIndexRealFile
 {
    void * const d;
- public:
+
+protected:
+   virtual std::string GetComponent() const APT_OVERRIDE;
+   virtual std::string GetArchitecture() const APT_OVERRIDE;
+   virtual uint8_t GetIndexFlags() const APT_OVERRIDE;
+
+public:
    virtual const Type *GetType() const APT_OVERRIDE APT_CONST;
    virtual pkgSrcRecords::Parser *CreateSrcParser() const APT_OVERRIDE;
    virtual bool HasPackages() const APT_OVERRIDE {return false;};
@@ -163,7 +169,10 @@ class debDscFileIndex : public pkgDebianIndexRealFile
 
 class debDebianSourceDirIndex : public debDscFileIndex
 {
- public:
+protected:
+   virtual std::string GetComponent() const APT_OVERRIDE;
+
+public:
    virtual const Type *GetType() const APT_OVERRIDE APT_CONST;
 };
 
diff --git a/apt-pkg/sourcelist.cc b/apt-pkg/sourcelist.cc
index 1e6b831be..6773b069f 100644
--- a/apt-pkg/sourcelist.cc
+++ b/apt-pkg/sourcelist.cc
@@ -544,11 +544,17 @@ void pkgSourceList::AddVolatileFile(pkgIndexFile * const File)		/*{{{*/
 									/*}}}*/
 bool pkgSourceList::AddVolatileFile(std::string const &File)		/*{{{*/
 {
+   // Note: FileExists matches directories and links, too!
    if (File.empty() || FileExists(File) == false)
       return false;
 
-   if (flExtension(File) == "deb")
+   std::string const ext = flExtension(File);
+   if (ext == "deb")
       AddVolatileFile(new debDebPkgFileIndex(File));
+   else if (ext == "dsc")
+      AddVolatileFile(new debDscFileIndex(File));
+   else if (FileExists(flCombine(File, "debian/control")))
+      AddVolatileFile(new debDscFileIndex(flCombine(File, "debian/control")));
    else
       return false;