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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: gzip.cc,v 1.17.2.1 2004/01/16 18:58:50 mdz Exp $
/* ######################################################################
GZip method - Take a file URI in and decompress it into the target
file.
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#include <apt-pkg/fileutl.h>
#include <apt-pkg/error.h>
#include <apt-pkg/acquire-method.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/hashes.h>
#include <sys/stat.h>
#include <unistd.h>
#include <utime.h>
#include <stdio.h>
#include <errno.h>
#include <apti18n.h>
/*}}}*/
const char *Prog;
class GzipMethod : public pkgAcqMethod
{
virtual bool Fetch(FetchItem *Itm);
public:
GzipMethod() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {};
};
// GzipMethod::Fetch - Decompress the passed URI /*{{{*/
// ---------------------------------------------------------------------
/* */
bool GzipMethod::Fetch(FetchItem *Itm)
{
URI Get = Itm->Uri;
string Path = Get.Host + Get.Path; // To account for relative paths
string GzPathOption = "Dir::bin::"+string(Prog);
FetchResult Res;
Res.Filename = Itm->DestFile;
URIStart(Res);
// Open the source and destination files
FileFd From(Path,FileFd::ReadOnly);
// if the file is empty, just rename it and return
if(From.Size() == 0)
{
rename(Path.c_str(), Itm->DestFile.c_str());
return true;
}
int GzOut[2];
if (pipe(GzOut) < 0)
return _error->Errno("pipe",_("Couldn't open pipe for %s"),Prog);
// Fork gzip
pid_t Process = ExecFork();
if (Process == 0)
{
close(GzOut[0]);
dup2(From.Fd(),STDIN_FILENO);
dup2(GzOut[1],STDOUT_FILENO);
From.Close();
close(GzOut[1]);
SetCloseExec(STDIN_FILENO,false);
SetCloseExec(STDOUT_FILENO,false);
const char *Args[3];
string Tmp = _config->Find(GzPathOption,Prog);
Args[0] = Tmp.c_str();
Args[1] = "-d";
Args[2] = 0;
execvp(Args[0],(char **)Args);
_exit(100);
}
From.Close();
close(GzOut[1]);
FileFd FromGz(GzOut[0]); // For autoclose
FileFd To(Itm->DestFile,FileFd::WriteEmpty);
To.EraseOnFailure();
if (_error->PendingError() == true)
return false;
// Read data from gzip, generate checksums and write
Hashes Hash;
bool Failed = false;
while (1)
{
unsigned char Buffer[4*1024];
unsigned long Count;
Count = read(GzOut[0],Buffer,sizeof(Buffer));
if (Count < 0 && errno == EINTR)
continue;
if (Count < 0)
{
_error->Errno("read", _("Read error from %s process"),Prog);
Failed = true;
break;
}
if (Count == 0)
break;
Hash.Add(Buffer,Count);
if (To.Write(Buffer,Count) == false)
{
Failed = true;
FromGz.Close();
break;
}
}
// Wait for gzip to finish
if (ExecWait(Process,_config->Find(GzPathOption,Prog).c_str(),false) == false)
{
To.OpFail();
return false;
}
To.Close();
if (Failed == true)
return false;
// Transfer the modification times
struct stat Buf;
if (stat(Path.c_str(),&Buf) != 0)
return _error->Errno("stat",_("Failed to stat"));
struct utimbuf TimeBuf;
TimeBuf.actime = Buf.st_atime;
TimeBuf.modtime = Buf.st_mtime;
if (utime(Itm->DestFile.c_str(),&TimeBuf) != 0)
return _error->Errno("utime",_("Failed to set modification time"));
if (stat(Itm->DestFile.c_str(),&Buf) != 0)
return _error->Errno("stat",_("Failed to stat"));
// Return a Done response
Res.LastModified = Buf.st_mtime;
Res.Size = Buf.st_size;
Res.TakeHashes(Hash);
URIDone(Res);
return true;
}
/*}}}*/
int main(int argc, char *argv[])
{
setlocale(LC_ALL, "");
GzipMethod Mth;
Prog = strrchr(argv[0],'/');
Prog++;
return Mth.Run();
}
|
