| 1 | // -*- mode: cpp; mode: fold -*- |
| 2 | // Description /*{{{*/ |
| 3 | /* ###################################################################### |
| 4 | |
| 5 | Bzip2 method - Take a file URI in and decompress it into the target |
| 6 | file. |
| 7 | |
| 8 | While the method is named "bzip2" it handles also other compression |
| 9 | types as it calls binaries based on the name of the method, |
| 10 | so it can also be used to handle gzip, lzma and others if named |
| 11 | correctly. |
| 12 | |
| 13 | ##################################################################### */ |
| 14 | /*}}}*/ |
| 15 | // Include Files /*{{{*/ |
| 16 | #include <config.h> |
| 17 | |
| 18 | #include <apt-pkg/fileutl.h> |
| 19 | #include <apt-pkg/error.h> |
| 20 | #include <apt-pkg/acquire-method.h> |
| 21 | #include <apt-pkg/strutl.h> |
| 22 | #include <apt-pkg/hashes.h> |
| 23 | |
| 24 | #include <sys/stat.h> |
| 25 | #include <unistd.h> |
| 26 | #include <utime.h> |
| 27 | #include <stdio.h> |
| 28 | #include <errno.h> |
| 29 | #include <apti18n.h> |
| 30 | /*}}}*/ |
| 31 | |
| 32 | const char *Prog; |
| 33 | |
| 34 | class Bzip2Method : public pkgAcqMethod |
| 35 | { |
| 36 | virtual bool Fetch(FetchItem *Itm); |
| 37 | |
| 38 | public: |
| 39 | |
| 40 | Bzip2Method() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {}; |
| 41 | }; |
| 42 | |
| 43 | |
| 44 | // Bzip2Method::Fetch - Decompress the passed URI /*{{{*/ |
| 45 | // --------------------------------------------------------------------- |
| 46 | /* */ |
| 47 | bool Bzip2Method::Fetch(FetchItem *Itm) |
| 48 | { |
| 49 | URI Get = Itm->Uri; |
| 50 | string Path = Get.Host + Get.Path; // To account for relative paths |
| 51 | |
| 52 | string GzPathOption = "Dir::bin::"+string(Prog); |
| 53 | |
| 54 | FetchResult Res; |
| 55 | Res.Filename = Itm->DestFile; |
| 56 | URIStart(Res); |
| 57 | |
| 58 | // Open the source and destination files |
| 59 | FileFd From(Path,FileFd::ReadOnly); |
| 60 | |
| 61 | if(From.FileSize() == 0) |
| 62 | return _error->Error(_("Empty files can't be valid archives")); |
| 63 | |
| 64 | int GzOut[2]; |
| 65 | if (pipe(GzOut) < 0) |
| 66 | return _error->Errno("pipe",_("Couldn't open pipe for %s"),Prog); |
| 67 | |
| 68 | // Fork bzip2 |
| 69 | pid_t Process = ExecFork(); |
| 70 | if (Process == 0) |
| 71 | { |
| 72 | close(GzOut[0]); |
| 73 | dup2(From.Fd(),STDIN_FILENO); |
| 74 | dup2(GzOut[1],STDOUT_FILENO); |
| 75 | From.Close(); |
| 76 | close(GzOut[1]); |
| 77 | SetCloseExec(STDIN_FILENO,false); |
| 78 | SetCloseExec(STDOUT_FILENO,false); |
| 79 | |
| 80 | const char *Args[3]; |
| 81 | string Tmp = _config->Find(GzPathOption,Prog); |
| 82 | Args[0] = Tmp.c_str(); |
| 83 | Args[1] = "-d"; |
| 84 | Args[2] = 0; |
| 85 | execvp(Args[0],(char **)Args); |
| 86 | _exit(100); |
| 87 | } |
| 88 | From.Close(); |
| 89 | close(GzOut[1]); |
| 90 | |
| 91 | FileFd FromGz(GzOut[0]); // For autoclose |
| 92 | FileFd To(Itm->DestFile,FileFd::WriteAtomic); |
| 93 | To.EraseOnFailure(); |
| 94 | if (_error->PendingError() == true) |
| 95 | return false; |
| 96 | |
| 97 | // Read data from bzip2, generate checksums and write |
| 98 | Hashes Hash; |
| 99 | bool Failed = false; |
| 100 | while (1) |
| 101 | { |
| 102 | unsigned char Buffer[4*1024]; |
| 103 | |
| 104 | ssize_t Count = read(GzOut[0],Buffer,sizeof(Buffer)); |
| 105 | if (Count < 0 && errno == EINTR) |
| 106 | continue; |
| 107 | |
| 108 | if (Count < 0) |
| 109 | { |
| 110 | _error->Errno("read", _("Read error from %s process"),Prog); |
| 111 | Failed = true; |
| 112 | break; |
| 113 | } |
| 114 | |
| 115 | if (Count == 0) |
| 116 | break; |
| 117 | |
| 118 | Hash.Add(Buffer,Count); |
| 119 | if (To.Write(Buffer,Count) == false) |
| 120 | { |
| 121 | Failed = true; |
| 122 | FromGz.Close(); |
| 123 | break; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | // Wait for bzip2 to finish |
| 128 | if (ExecWait(Process,_config->Find(GzPathOption,Prog).c_str(),false) == false) |
| 129 | { |
| 130 | To.OpFail(); |
| 131 | return false; |
| 132 | } |
| 133 | |
| 134 | To.Close(); |
| 135 | |
| 136 | if (Failed == true) |
| 137 | return false; |
| 138 | |
| 139 | // Transfer the modification times |
| 140 | struct stat Buf; |
| 141 | if (stat(Path.c_str(),&Buf) != 0) |
| 142 | return _error->Errno("stat",_("Failed to stat")); |
| 143 | |
| 144 | struct utimbuf TimeBuf; |
| 145 | TimeBuf.actime = Buf.st_atime; |
| 146 | TimeBuf.modtime = Buf.st_mtime; |
| 147 | if (utime(Itm->DestFile.c_str(),&TimeBuf) != 0) |
| 148 | return _error->Errno("utime",_("Failed to set modification time")); |
| 149 | |
| 150 | if (stat(Itm->DestFile.c_str(),&Buf) != 0) |
| 151 | return _error->Errno("stat",_("Failed to stat")); |
| 152 | |
| 153 | // Return a Done response |
| 154 | Res.LastModified = Buf.st_mtime; |
| 155 | Res.Size = Buf.st_size; |
| 156 | Res.TakeHashes(Hash); |
| 157 | |
| 158 | URIDone(Res); |
| 159 | |
| 160 | return true; |
| 161 | } |
| 162 | /*}}}*/ |
| 163 | |
| 164 | int main(int argc, char *argv[]) |
| 165 | { |
| 166 | setlocale(LC_ALL, ""); |
| 167 | |
| 168 | Bzip2Method Mth; |
| 169 | |
| 170 | Prog = strrchr(argv[0],'/'); |
| 171 | Prog++; |
| 172 | |
| 173 | return Mth.Run(); |
| 174 | } |