summaryrefslogtreecommitdiff
path: root/methods/file.cc
blob: 5c76ec1224ef83bb019f2d82f47e67a62945b6c4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: file.cc,v 1.9.2.1 2004/01/16 18:58:50 mdz Exp $
/* ######################################################################

   File URI method for APT
   
   This simply checks that the file specified exists, if so the relevant
   information is returned. If a .gz filename is specified then the file
   name with .gz removed will also be checked and information about it
   will be returned in Alt-*
   
   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <config.h>

#include <apt-pkg/acquire-method.h>
#include <apt-pkg/aptconfiguration.h>
#include <apt-pkg/error.h>
#include <apt-pkg/hashes.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/strutl.h>

#include <string>
#include <sys/stat.h>

#include <apti18n.h>
									/*}}}*/

class FileMethod : public pkgAcqMethod
{
   virtual bool Fetch(FetchItem *Itm);
   
   public:
   
   FileMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig | LocalOnly) {};
};

// FileMethod::Fetch - Fetch a file					/*{{{*/
// ---------------------------------------------------------------------
/* */
bool FileMethod::Fetch(FetchItem *Itm)
{
   URI Get = Itm->Uri;
   std::string File = Get.Path;
   FetchResult Res;
   if (Get.Host.empty() == false)
      return _error->Error(_("Invalid URI, local URIS must not start with //"));

   struct stat Buf;
   // deal with destination files which might linger around
   if (lstat(Itm->DestFile.c_str(), &Buf) == 0)
   {
      if ((Buf.st_mode & S_IFREG) != 0)
      {
	 if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
	 {
	    HashStringList const hsl = Itm->ExpectedHashes;
	    if (Itm->ExpectedHashes.VerifyFile(File))
	    {
	       Res.Filename = Itm->DestFile;
	       Res.IMSHit = true;
	    }
	 }
      }
   }
   if (Res.IMSHit != true)
      unlink(Itm->DestFile.c_str());

   // See if the file exists
   if (stat(File.c_str(),&Buf) == 0)
   {
      Res.Size = Buf.st_size;
      Res.Filename = File;
      Res.LastModified = Buf.st_mtime;
      Res.IMSHit = false;
      if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
      {
	 unsigned long long const filesize = Itm->ExpectedHashes.FileSize();
	 if (filesize != 0 && filesize == Res.Size)
	    Res.IMSHit = true;
      }

      Hashes Hash(Itm->ExpectedHashes);
      FileFd Fd(File, FileFd::ReadOnly);
      Hash.AddFD(Fd);
      Res.TakeHashes(Hash);
   }
   if (Res.IMSHit == false)
      URIStart(Res);

   // See if the uncompressed file exists and reuse it
   FetchResult AltRes;
   AltRes.Filename.clear();
   std::vector<std::string> extensions = APT::Configuration::getCompressorExtensions();
   for (std::vector<std::string>::const_iterator ext = extensions.begin(); ext != extensions.end(); ++ext)
   {
      if (APT::String::Endswith(File, *ext) == true)
      {
	 std::string const unfile = File.substr(0, File.length() - ext->length() - 1);
	 if (stat(unfile.c_str(),&Buf) == 0)
	 {
	    AltRes.Size = Buf.st_size;
	    AltRes.Filename = unfile;
	    AltRes.LastModified = Buf.st_mtime;
	    AltRes.IMSHit = false;
	    if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
	       AltRes.IMSHit = true;
	    break;
	 }
	 // no break here as we could have situations similar to '.gz' vs '.tar.gz' here
      }
   }

   if (AltRes.Filename.empty() == false)
      URIDone(Res,&AltRes);
   else if (Res.Filename.empty() == false)
      URIDone(Res);
   else
      return _error->Error(_("File not found"));

   return true;
}
									/*}}}*/

int main()
{
   setlocale(LC_ALL, "");

   FileMethod Mth;
   return Mth.Run();
}