all errors should be printed to stderr
[apt.git] / methods / gzip.cc
0 / 146 (  0%)
CommitLineData
1// -*- mode: cpp; mode: fold -*-
2// Description /*{{{*/
3// $Id: gzip.cc,v 1.17.2.1 2004/01/16 18:58:50 mdz Exp $
4/* ######################################################################
5
6 GZip method - Take a file URI in and decompress it into the target
7 file.
8
9 ##################################################################### */
10 /*}}}*/
11// Include Files /*{{{*/
12#include <config.h>
13
14#include <apt-pkg/configuration.h>
15#include <apt-pkg/acquire-method.h>
16#include <apt-pkg/error.h>
17#include <apt-pkg/fileutl.h>
18#include <apt-pkg/hashes.h>
19#include <apt-pkg/strutl.h>
20#include <apt-pkg/aptconfiguration.h>
21
22#include <string.h>
23#include <sys/stat.h>
24#include <sys/time.h>
25#include <string>
26#include <vector>
27
28#include <apti18n.h>
29 /*}}}*/
30
31const char *Prog;
32
33class GzipMethod : public pkgAcqMethod
34{
35 virtual bool Fetch(FetchItem *Itm);
36
37 public:
38
39 GzipMethod() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {};
40};
41
42
43// GzipMethod::Fetch - Decompress the passed URI /*{{{*/
44// ---------------------------------------------------------------------
45/* */
46bool GzipMethod::Fetch(FetchItem *Itm)
47{
48 URI Get = Itm->Uri;
49 std::string Path = Get.Host + Get.Path; // To account for relative paths
50
51 FetchResult Res;
52 Res.Filename = Itm->DestFile;
53 URIStart(Res);
54
55 std::vector<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors();
56 std::vector<APT::Configuration::Compressor>::const_iterator compressor = compressors.begin();
57 for (; compressor != compressors.end(); ++compressor)
58 if (compressor->Name == Prog)
59 break;
60 if (compressor == compressors.end())
61 return _error->Error("Extraction of file %s requires unknown compressor %s", Path.c_str(), Prog);
62
63 // Open the source and destination files
64 FileFd From, To;
65 if (_config->FindB("Method::Compress", false) == false)
66 {
67 From.Open(Path, FileFd::ReadOnly, *compressor);
68 if(From.FileSize() == 0)
69 return _error->Error(_("Empty files can't be valid archives"));
70 To.Open(Itm->DestFile, FileFd::WriteAtomic);
71 }
72 else
73 {
74 From.Open(Path, FileFd::ReadOnly);
75 To.Open(Itm->DestFile, FileFd::WriteOnly | FileFd::Create | FileFd::Empty, *compressor);
76 }
77 To.EraseOnFailure();
78
79 if (From.IsOpen() == false || From.Failed() == true ||
80 To.IsOpen() == false || To.Failed() == true)
81 return false;
82
83 // Read data from source, generate checksums and write
84 Hashes Hash;
85 bool Failed = false;
86 while (1)
87 {
88 unsigned char Buffer[4*1024];
89 unsigned long long Count = 0;
90
91 if (!From.Read(Buffer,sizeof(Buffer),&Count))
92 {
93 To.OpFail();
94 return false;
95 }
96 if (Count == 0)
97 break;
98
99 Hash.Add(Buffer,Count);
100 if (To.Write(Buffer,Count) == false)
101 {
102 Failed = true;
103 break;
104 }
105 }
106
107 From.Close();
108 Res.Size = To.FileSize();
109 To.Close();
110
111 if (Failed == true)
112 return false;
113
114 // Transfer the modification times
115 struct stat Buf;
116 if (stat(Path.c_str(),&Buf) != 0)
117 return _error->Errno("stat",_("Failed to stat"));
118
119 struct timeval times[2];
120 times[0].tv_sec = Buf.st_atime;
121 Res.LastModified = times[1].tv_sec = Buf.st_mtime;
122 times[0].tv_usec = times[1].tv_usec = 0;
123 if (utimes(Itm->DestFile.c_str(), times) != 0)
124 return _error->Errno("utimes",_("Failed to set modification time"));
125
126 // Return a Done response
127 Res.TakeHashes(Hash);
128
129 URIDone(Res);
130 return true;
131}
132 /*}}}*/
133
134int main(int, char *argv[])
135{
136 setlocale(LC_ALL, "");
137
138 Prog = strrchr(argv[0],'/');
139 ++Prog;
140
141 GzipMethod Mth;
142
143 Mth.DropPrivsOrDie();
144
145 return Mth.Run();
146}