support "install ./foo.changes"

We support installing ./foo.deb (and ./foo.dsc for source) for a while
now, but it can be a bit clunky to work with those directly if you e.g.
build packages locally in a 'central' build-area.

The changes files also include hashsums and can be signed, so this can
also be considered an enhancement in terms of security as a user "just"
has to verify the signature on the changes file then rather than
checking all deb files individually in these manual installation
procedures.

2 files changed, 19 insertions, 2 deletions

diff --git a/apt-pkg/deb/debsrcrecords.cc b/apt-pkg/deb/debsrcrecords.cc
index e8295debb..5454d79c3 100644
--- a/apt-pkg/deb/debsrcrecords.cc
+++ b/apt-pkg/deb/debsrcrecords.cc
@@ -41,7 +41,15 @@ debSrcRecordParser::debSrcRecordParser(std::string const &File,pkgIndexFile cons
 	 Tags.Init(&Fd, 102400);
    }
 }
-
+std::string debSrcRecordParser::Package() const				/*{{{*/
+{
+   auto const name = Sect.FindS("Package");
+   if (iIndex == nullptr)
+      return name.empty() ? Sect.FindS("Source") : name;
+   else
+      return name;
+}
+									/*}}}*/
 // SrcRecordParser::Binaries - Return the binaries field		/*{{{*/
 // ---------------------------------------------------------------------
 /* This member parses the binaries field into a pair of class arrays and
@@ -190,6 +198,15 @@ bool debSrcRecordParser::Files2(std::vector<pkgSrcRecords::File2> &List)
 	       ParseQuoteWord(C, path) == false)
 	    return _error->Error("Error parsing file record in %s of source package %s", checksumField.c_str(), Package().c_str());
 
+	 if (iIndex == nullptr && checksumField == "Files")
+	 {
+	    // the Files field has a different format than the rest in deb-changes files
+	    std::string ignore;
+	    if (ParseQuoteWord(C, ignore) == false ||
+		  ParseQuoteWord(C, path) == false)
+	       return _error->Error("Error parsing file record in %s of source package %s", checksumField.c_str(), Package().c_str());
+	 }
+
 	 HashString const hashString(*type, hash);
 	 if (Base.empty() == false)
 	    path = Base + path;
diff --git a/apt-pkg/deb/debsrcrecords.h b/apt-pkg/deb/debsrcrecords.h
index 89134af5f..850040cf5 100644
--- a/apt-pkg/deb/debsrcrecords.h
+++ b/apt-pkg/deb/debsrcrecords.h
@@ -40,7 +40,7 @@ class APT_HIDDEN debSrcRecordParser : public pkgSrcRecords::Parser
    virtual bool Step() APT_OVERRIDE {iOffset = Tags.Offset(); return Tags.Step(Sect);};
    virtual bool Jump(unsigned long const &Off) APT_OVERRIDE {iOffset = Off; return Tags.Jump(Sect,Off);};
 
-   virtual std::string Package() const APT_OVERRIDE {return Sect.FindS("Package");};
+   virtual std::string Package() const APT_OVERRIDE;
    virtual std::string Version() const APT_OVERRIDE {return Sect.FindS("Version");};
    virtual std::string Maintainer() const APT_OVERRIDE {return Sect.FindS("Maintainer");};
    virtual std::string Section() const APT_OVERRIDE {return Sect.FindS("Section");};