apt-pkg/deb/dpkgpm.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: dpkgpm.cc,v 1.16 1999/12/12 03:48:36 jgg Exp $
   4 /* ######################################################################
   5
   6    DPKG Package Manager - Provide an interface to dpkg
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Includes                                                             /*{{{*/
  11 #ifdef __GNUG__
  12 #pragma implementation "apt-pkg/dpkgpm.h"
  13 #endif
  14 #include <apt-pkg/dpkgpm.h>
  15 #include <apt-pkg/error.h>
  16 #include <apt-pkg/configuration.h>
  17
  18 #include <unistd.h>
  19 #include <stdlib.h>
  20 #include <fcntl.h>
  21 #include <sys/types.h>
  22 #include <sys/wait.h>
  23 #include <signal.h>
  24 #include <errno.h>
  25 #include <stdio.h>
  26                                                                         /*}}}*/
  27
  28 // DPkgPM::pkgDPkgPM - Constructor                                      /*{{{*/
  29 // ---------------------------------------------------------------------
  30 /* */
  31 pkgDPkgPM::pkgDPkgPM(pkgDepCache &Cache) : pkgPackageManager(Cache)
  32 {
  33 }
  34                                                                         /*}}}*/
  35 // DPkgPM::pkgDPkgPM - Destructor                                       /*{{{*/
  36 // ---------------------------------------------------------------------
  37 /* */
  38 pkgDPkgPM::~pkgDPkgPM()
  39 {
  40 }
  41                                                                         /*}}}*/
  42 // DPkgPM::Install - Install a package                                  /*{{{*/
  43 // ---------------------------------------------------------------------
  44 /* Add an install operation to the sequence list */
  45 bool pkgDPkgPM::Install(PkgIterator Pkg,string File)
  46 {
  47    if (File.empty() == true || Pkg.end() == true)
  48       return _error->Error("Internal Error, No file name for %s",Pkg.Name());
  49
  50    List.push_back(Item(Item::Install,Pkg,File));
  51    return true;
  52 }
  53                                                                         /*}}}*/
  54 // DPkgPM::Configure - Configure a package                              /*{{{*/
  55 // ---------------------------------------------------------------------
  56 /* Add a configure operation to the sequence list */
  57 bool pkgDPkgPM::Configure(PkgIterator Pkg)
  58 {
  59    if (Pkg.end() == true)
  60       return false;
  61
  62    List.push_back(Item(Item::Configure,Pkg));
  63    return true;
  64 }
  65                                                                         /*}}}*/
  66 // DPkgPM::Remove - Remove a package                                    /*{{{*/
  67 // ---------------------------------------------------------------------
  68 /* Add a remove operation to the sequence list */
  69 bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
  70 {
  71    if (Pkg.end() == true)
  72       return false;
  73
  74    if (Purge == true)
  75       List.push_back(Item(Item::Purge,Pkg));
  76    else
  77       List.push_back(Item(Item::Remove,Pkg));
  78    return true;
  79 }
  80                                                                         /*}}}*/
  81 // DPkgPM::RunScripts - Run a set of scripts                            /*{{{*/
  82 // ---------------------------------------------------------------------
  83 /* This looks for a list of script sto run from the configuration file,
  84    each one is run with system from a forked child. */
  85 bool pkgDPkgPM::RunScripts(const char *Cnf)
  86 {
  87    Configuration::Item const *Opts = _config->Tree(Cnf);
  88    if (Opts == 0 || Opts->Child == 0)
  89       return true;
  90    Opts = Opts->Child;
  91
  92    // Fork for running the system calls
  93    pid_t Child = ExecFork();
  94
  95    // This is the child
  96    if (Child == 0)
  97    {
  98       if (chdir("/tmp/") != 0)
  99          _exit(100);
 100
 101       unsigned int Count = 1;
 102       for (; Opts != 0; Opts = Opts->Next, Count++)
 103       {
 104          if (Opts->Value.empty() == true)
 105             continue;
 106
 107          if (system(Opts->Value.c_str()) != 0)
 108             _exit(100+Count);
 109       }
 110       _exit(0);
 111    }
 112
 113    // Wait for the child
 114    int Status = 0;
 115    while (waitpid(Child,&Status,0) != Child)
 116    {
 117       if (errno == EINTR)
 118          continue;
 119       return _error->Errno("waitpid","Couldn't wait for subprocess");
 120    }
 121
 122    // Restore sig int/quit
 123    signal(SIGQUIT,SIG_DFL);
 124    signal(SIGINT,SIG_DFL);
 125
 126    // Check for an error code.
 127    if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 128    {
 129       unsigned int Count = WEXITSTATUS(Status);
 130       if (Count > 100)
 131       {
 132          Count -= 100;
 133          for (; Opts != 0 && Count != 1; Opts = Opts->Next, Count--);
 134          _error->Error("Problem executing scripts %s '%s'",Cnf,Opts->Value.c_str());
 135       }
 136
 137       return _error->Error("Sub-process returned an error code");
 138    }
 139
 140    return true;
 141 }
 142
 143                                                                         /*}}}*/
 144 // DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
 145 // ---------------------------------------------------------------------
 146 /* This looks for a list of scripts to run from the configuration file
 147    each one is run and is fed on standard input a list of all .deb files
 148    that are due to be installed. */
 149 bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 150 {
 151    Configuration::Item const *Opts = _config->Tree(Cnf);
 152    if (Opts == 0 || Opts->Child == 0)
 153       return true;
 154    Opts = Opts->Child;
 155
 156    unsigned int Count = 1;
 157    for (; Opts != 0; Opts = Opts->Next, Count++)
 158    {
 159       if (Opts->Value.empty() == true)
 160          continue;
 161
 162       // Create the pipes
 163       int Pipes[2];
 164       if (pipe(Pipes) != 0)
 165          return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 166       SetCloseExec(Pipes[0],true);
 167       SetCloseExec(Pipes[1],true);
 168
 169       // Purified Fork for running the script
 170       pid_t Process = ExecFork();
 171       if (Process == 0)
 172       {
 173          // Setup the FDs
 174          dup2(Pipes[0],STDIN_FILENO);
 175          SetCloseExec(STDOUT_FILENO,false);
 176          SetCloseExec(STDIN_FILENO,false);
 177          SetCloseExec(STDERR_FILENO,false);
 178
 179          const char *Args[4];
 180          Args[0] = "/bin/sh";
 181          Args[1] = "-c";
 182          Args[2] = Opts->Value.c_str();
 183          Args[3] = 0;
 184          execv(Args[0],(char **)Args);
 185          _exit(100);
 186       }
 187       close(Pipes[0]);
 188       FileFd Fd(Pipes[1]);
 189
 190       // Feed it the filenames.
 191       for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 192       {
 193          // Only deal with packages to be installed from .deb
 194          if (I->Op != Item::Install)
 195             continue;
 196
 197          // No errors here..
 198          if (I->File[0] != '/')
 199             continue;
 200
 201          /* Feed the filename of each package that is pending install
 202             into the pipe. */
 203          if (Fd.Write(I->File.begin(),I->File.length()) == false ||
 204              Fd.Write("\n",1) == false)
 205          {
 206             kill(Process,SIGINT);
 207             Fd.Close();
 208             ExecWait(Process,Opts->Value.c_str(),true);
 209             return _error->Error("Failure running script %s",Opts->Value.c_str());
 210          }
 211       }
 212       Fd.Close();
 213
 214       // Clean up the sub process
 215       if (ExecWait(Process,Opts->Value.c_str()) == false)
 216          return _error->Error("Failure running script %s",Opts->Value.c_str());
 217    }
 218
 219    return true;
 220 }
 221
 222                                                                         /*}}}*/
 223 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 224 // ---------------------------------------------------------------------
 225 /* This globs the operations and calls dpkg */
 226 bool pkgDPkgPM::Go()
 227 {
 228    if (RunScripts("DPkg::Pre-Invoke") == false)
 229       return false;
 230
 231    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 232       return false;
 233
 234    for (vector<Item>::iterator I = List.begin(); I != List.end();)
 235    {
 236       vector<Item>::iterator J = I;
 237       for (; J != List.end() && J->Op == I->Op; J++);
 238
 239       // Generate the argument list
 240       const char *Args[400];
 241       if (J - I > 350)
 242          J = I + 350;
 243
 244       unsigned int n = 0;
 245       unsigned long Size = 0;
 246       Args[n++] = _config->Find("Dir::Bin::dpkg","dpkg").c_str();
 247       Size += strlen(Args[n-1]);
 248
 249       // Stick in any custom dpkg options
 250       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 251       if (Opts != 0)
 252       {
 253          Opts = Opts->Child;
 254          for (; Opts != 0; Opts = Opts->Next)
 255          {
 256             if (Opts->Value.empty() == true)
 257                continue;
 258             Args[n++] = Opts->Value.c_str();
 259             Size += Opts->Value.length();
 260          }
 261       }
 262
 263       switch (I->Op)
 264       {
 265          case Item::Remove:
 266          Args[n++] = "--force-depends";
 267          Size += strlen(Args[n-1]);
 268          Args[n++] = "--force-remove-essential";
 269          Size += strlen(Args[n-1]);
 270          Args[n++] = "--remove";
 271          Size += strlen(Args[n-1]);
 272          break;
 273
 274          case Item::Purge:
 275          Args[n++] = "--force-depends";
 276          Size += strlen(Args[n-1]);
 277          Args[n++] = "--force-remove-essential";
 278          Size += strlen(Args[n-1]);
 279          Args[n++] = "--purge";
 280          Size += strlen(Args[n-1]);
 281          break;
 282
 283          case Item::Configure:
 284          Args[n++] = "--configure";
 285          Size += strlen(Args[n-1]);
 286          break;
 287
 288          case Item::Install:
 289          Args[n++] = "--unpack";
 290          Size += strlen(Args[n-1]);
 291          break;
 292       }
 293
 294       // Write in the file or package names
 295       if (I->Op == Item::Install)
 296       {
 297          for (;I != J && Size < 1024; I++)
 298          {
 299             if (I->File[0] != '/')
 300                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 301             Args[n++] = I->File.c_str();
 302             Size += strlen(Args[n-1]);
 303          }
 304       }
 305       else
 306       {
 307          for (;I != J && Size < 1024; I++)
 308          {
 309             Args[n++] = I->Pkg.Name();
 310             Size += strlen(Args[n-1]);
 311          }
 312       }
 313       Args[n] = 0;
 314       J = I;
 315
 316       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 317       {
 318          for (unsigned int k = 0; k != n; k++)
 319             clog << Args[k] << ' ';
 320          clog << endl;
 321          continue;
 322       }
 323
 324       cout << flush;
 325       clog << flush;
 326       cerr << flush;
 327
 328       /* Mask off sig int/quit. We do this because dpkg also does when
 329          it forks scripts. What happens is that when you hit ctrl-c it sends
 330          it to all processes in the group. Since dpkg ignores the signal
 331          it doesn't die but we do! So we must also ignore it */
 332       signal(SIGQUIT,SIG_IGN);
 333       signal(SIGINT,SIG_IGN);
 334
 335       // Fork dpkg
 336       pid_t Child = ExecFork();
 337
 338       // This is the child
 339       if (Child == 0)
 340       {
 341          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
 342             _exit(100);
 343
 344          int Flags,dummy;
 345          if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
 346             _exit(100);
 347
 348          // Discard everything in stdin before forking dpkg
 349          if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
 350             _exit(100);
 351
 352          while (read(STDIN_FILENO,&dummy,1) == 1);
 353
 354          if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
 355             _exit(100);
 356
 357          /* No Job Control Stop Env is a magic dpkg var that prevents it
 358             from using sigstop */
 359          putenv("DPKG_NO_TSTP=yes");
 360          execvp(Args[0],(char **)Args);
 361          cerr << "Could not exec dpkg!" << endl;
 362          _exit(100);
 363       }
 364
 365       // Wait for dpkg
 366       int Status = 0;
 367       while (waitpid(Child,&Status,0) != Child)
 368       {
 369          if (errno == EINTR)
 370             continue;
 371          RunScripts("DPkg::Post-Invoke");
 372          return _error->Errno("waitpid","Couldn't wait for subprocess");
 373       }
 374
 375       // Restore sig int/quit
 376       signal(SIGQUIT,SIG_DFL);
 377       signal(SIGINT,SIG_DFL);
 378
 379       // Check for an error code.
 380       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 381       {
 382          RunScripts("DPkg::Post-Invoke");
 383          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
 384             return _error->Error("Sub-process %s recieved a segmentation fault.",Args[0]);
 385
 386          if (WIFEXITED(Status) != 0)
 387             return _error->Error("Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
 388
 389          return _error->Error("Sub-process %s exited unexpectedly",Args[0]);
 390       }
 391    }
 392
 393    if (RunScripts("DPkg::Post-Invoke") == false)
 394       return false;
 395    return true;
 396 }
 397                                                                         /*}}}*/
 398 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
 399 // ---------------------------------------------------------------------
 400 /* */
 401 void pkgDPkgPM::Reset()
 402 {
 403    List.erase(List.begin(),List.end());
 404 }
 405                                                                         /*}}}*/