allow uncompressed files to be empty in store again

[apt.git] / methods / copy.cc

diff --git a/methods/copy.cc b/methods/copy.cc
index d59f032ffa741f3aeeb644130a92c63418dec2b9..e515b2def10e1eed04abd89709915703470ec684 100644 (file)
--- a/methods/copy.cc
+++ b/methods/copy.cc
@@ -16,6 +16,8 @@
 #include <apt-pkg/acquire-method.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/hashes.h>
+#include <apt-pkg/configuration.h>
+#include "aptmethod.h"
 
 #include <string>
 #include <sys/stat.h>
@@ -24,13 +26,13 @@
 #include <apti18n.h>
                                                                        /*}}}*/
 
-class CopyMethod : public pkgAcqMethod
+class CopyMethod : public aptMethod
 {
-   virtual bool Fetch(FetchItem *Itm);
-   
+   virtual bool Fetch(FetchItem *Itm) APT_OVERRIDE;
+
    public:
-   
-   CopyMethod() : pkgAcqMethod("1.0",SingleInstance) {};
+
+   CopyMethod() : aptMethod("copy", "1.0",SingleInstance | SendConfig) {};
 };
 
 // CopyMethod::Fetch - Fetch a file                                    /*{{{*/
@@ -38,8 +40,8 @@ class CopyMethod : public pkgAcqMethod
 /* */
 bool CopyMethod::Fetch(FetchItem *Itm)
 {
-   URI Get = Itm->Uri;
-   std::string File = Get.Path;
+   // this ensures that relative paths work in copy
+   std::string const File = Itm->Uri.substr(Itm->Uri.find(':')+1);
 
    // Stat the file and send a start message
    struct stat Buf;
@@ -51,19 +53,22 @@ bool CopyMethod::Fetch(FetchItem *Itm)
    Res.Size = Buf.st_size;
    Res.Filename = Itm->DestFile;
    Res.LastModified = Buf.st_mtime;
-   Res.IMSHit = false;      
+   Res.IMSHit = false;
    URIStart(Res);
-   
+
+   // just calc the hashes if the source and destination are identical
+   if (File == Itm->DestFile || Itm->DestFile == "/dev/null")
+   {
+      CalculateHashes(Itm, Res);
+      URIDone(Res);
+      return true;
+   }
+
    // See if the file exists
    FileFd From(File,FileFd::ReadOnly);
    FileFd To(Itm->DestFile,FileFd::WriteAtomic);
    To.EraseOnFailure();
-   if (_error->PendingError() == true)
-   {
-      To.OpFail();
-      return false;
-   }
-   
+
    // Copy the file
    if (CopyFile(From,To) == false)
    {
@@ -82,11 +87,7 @@ bool CopyMethod::Fetch(FetchItem *Itm)
    if (utimes(Res.Filename.c_str(), times) != 0)
       return _error->Errno("utimes",_("Failed to set modification time"));
 
-   Hashes Hash;
-   FileFd Fd(Res.Filename, FileFd::ReadOnly);
-   Hash.AddFD(Fd);
-   Res.TakeHashes(Hash);
-
+   CalculateHashes(Itm, Res);
    URIDone(Res);
    return true;
 }
@@ -97,5 +98,6 @@ int main()
    setlocale(LC_ALL, "");
 
    CopyMethod Mth;
+
    return Mth.Run();
 }