Adding upstream version 2.7.12.upstream/2.7.12

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 557 insertions, 0 deletions

diff --git a/apt-pkg/deb/debsystem.cc b/apt-pkg/deb/debsystem.cc
new file mode 100644
index 0000000..a218005
--- /dev/null
+++ b/apt-pkg/deb/debsystem.cc
@@ -0,0 +1,557 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/* ######################################################################
+
+   System - Abstraction for running on different systems.
+
+   Basic general structure..
+   
+   ##################################################################### */
+									/*}}}*/
+// Include Files							/*{{{*/
+#include <config.h>
+
+#include <apt-pkg/configuration.h>
+#include <apt-pkg/debindexfile.h>
+#include <apt-pkg/debsystem.h>
+#include <apt-pkg/debversion.h>
+#include <apt-pkg/dpkgpm.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/pkgcache.h>
+#include <apt-pkg/progress.h>
+
+#include <algorithm>
+#include <sstream>
+
+#include <cctype>
+#include <cerrno>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <dirent.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include <apti18n.h>
+									/*}}}*/
+
+using std::string;
+
+debSystem debSys;
+
+class APT_HIDDEN debSystemPrivate {
+public:
+   debSystemPrivate() : FrontendLockFD(-1), LockFD(-1), LockCount(0), StatusFile(0)
+   {
+   }
+   // For locking support
+   int FrontendLockFD;
+   int LockFD;
+   unsigned LockCount;
+   
+   debStatusIndex *StatusFile;
+};
+
+// System::debSystem - Constructor					/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+debSystem::debSystem() : pkgSystem("Debian dpkg interface", &debVS), d(new debSystemPrivate())
+{
+}
+									/*}}}*/
+// System::~debSystem - Destructor					/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+debSystem::~debSystem()
+{
+   delete d->StatusFile;
+   delete d;
+}
+									/*}}}*/
+// System::Lock - Get the lock						/*{{{*/
+// ---------------------------------------------------------------------
+/* This mirrors the operations dpkg does when it starts up. Note the
+   checking of the updates directory. */
+static int GetLockMaybeWait(std::string const &file, OpProgress *Progress, int &timeoutSec)
+{
+   struct ScopedAbsoluteProgress
+   {
+      ScopedAbsoluteProgress() { _config->Set("APT::Internal::OpProgress::Absolute", true); }
+      ~ScopedAbsoluteProgress() { _config->Set("APT::Internal::OpProgress::Absolute", false); }
+   } _scopedAbsoluteProgress;
+   int fd = -1;
+   if (timeoutSec == 0 || Progress == nullptr)
+      return GetLock(file);
+
+   if (_config->FindB("Debug::Locking", false))
+      std::cerr << "Lock: " << file << " wait " << timeoutSec << std::endl;
+
+   for (int i = 0; timeoutSec < 0 || i < timeoutSec; i++)
+   {
+      _error->PushToStack();
+      fd = GetLock(file);
+      if (fd != -1 || errno == EPERM)
+      {
+	 if (timeoutSec > 0)
+	    timeoutSec -= i;
+	 _error->MergeWithStack();
+	 return fd;
+      }
+      std::string poppedError;
+      std::string completeError;
+      _error->PopMessage(poppedError);
+      _error->RevertToStack();
+
+      strprintf(completeError, _("Waiting for cache lock: %s"), poppedError.c_str());
+      sleep(1);
+      Progress->OverallProgress(i, timeoutSec, 0, completeError);
+   }
+
+   if (timeoutSec > 0)
+      timeoutSec = 1;
+   return fd;
+}
+
+bool debSystem::Lock(OpProgress *const Progress)
+{
+   // Disable file locking
+   if (_config->FindB("Debug::NoLocking",false) == true || d->LockCount > 0)
+   {
+      d->LockCount++;
+      return true;
+   }
+
+   // This will count downwards.
+   int lockTimeOutSec = _config->FindI("DPkg::Lock::Timeout", 0);
+   // Create the lockfile
+   string AdminDir = flNotFile(_config->FindFile("Dir::State::status"));
+   string FrontendLockFile = AdminDir + "lock-frontend";
+   d->FrontendLockFD = GetLockMaybeWait(FrontendLockFile, Progress, lockTimeOutSec);
+   if (d->FrontendLockFD == -1)
+   {
+      if (errno == EACCES || errno == EAGAIN)
+	 return _error->Error(_("Unable to acquire the dpkg frontend lock (%s), "
+	                        "is another process using it?"),FrontendLockFile.c_str());
+      else
+	 return _error->Error(_("Unable to acquire the dpkg frontend lock (%s), "
+	                        "are you root?"),FrontendLockFile.c_str());
+   }
+   if (LockInner(Progress, lockTimeOutSec) == false)
+   {
+      close(d->FrontendLockFD);
+      return false;
+   }
+   
+   // See if we need to abort with a dirty journal
+   if (CheckUpdates() == true)
+   {
+      close(d->LockFD);
+      close(d->FrontendLockFD);
+      d->FrontendLockFD = -1;
+      d->LockFD = -1;
+      const char *cmd;
+      if (getenv("SUDO_USER") != NULL)
+	 cmd = "sudo dpkg --configure -a";
+      else
+	 cmd = "dpkg --configure -a";
+      // TRANSLATORS: the %s contains the recovery command, usually
+      //              dpkg --configure -a
+      return _error->Error(_("dpkg was interrupted, you must manually "
+                             "run '%s' to correct the problem. "), cmd);
+   }
+
+	 d->LockCount++;
+      
+   return true;
+}
+
+bool debSystem::LockInner(OpProgress *const Progress, int timeOutSec)
+{
+   string AdminDir = flNotFile(_config->FindFile("Dir::State::status"));
+   d->LockFD = GetLockMaybeWait(AdminDir + "lock", Progress, timeOutSec);
+   if (d->LockFD == -1)
+   {
+      if (errno == EACCES || errno == EAGAIN)
+	 return _error->Error(_("Unable to lock the administration directory (%s), "
+	                        "is another process using it?"),AdminDir.c_str());
+      else
+	 return _error->Error(_("Unable to lock the administration directory (%s), "
+	                        "are you root?"),AdminDir.c_str());
+   }
+   return true;
+}
+									/*}}}*/
+// System::UnLock - Drop a lock						/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool debSystem::UnLock(bool NoErrors)
+{
+   if (d->LockCount == 0 && NoErrors == true)
+      return false;
+   
+   if (d->LockCount < 1)
+      return _error->Error(_("Not locked"));
+   if (--d->LockCount == 0)
+   {
+      close(d->LockFD);
+      close(d->FrontendLockFD);
+      d->LockCount = 0;
+   }
+   
+   return true;
+}
+bool debSystem::UnLockInner(bool NoErrors) {
+   (void) NoErrors;
+   close(d->LockFD);
+   return true;
+}
+									/*}}}*/
+// System::IsLocked - Check if system is locked						/*{{{*/
+// ---------------------------------------------------------------------
+/* This checks if the frontend lock is hold. The inner lock might be
+ * released. */
+bool debSystem::IsLocked()
+{
+   return d->LockCount > 0;
+}
+									/*}}}*/
+// System::CheckUpdates - Check if the updates dir is dirty		/*{{{*/
+// ---------------------------------------------------------------------
+/* This does a check of the updates directory (dpkg journal) to see if it has 
+   any entries in it. */
+bool debSystem::CheckUpdates()
+{
+   // Check for updates.. (dirty)
+   string File = flNotFile(_config->FindFile("Dir::State::status")) + "updates/";
+   DIR *DirP = opendir(File.c_str());
+   if (DirP == 0)
+      return false;
+   
+   /* We ignore any files that are not all digits, this skips .,.. and 
+      some tmp files dpkg will leave behind.. */
+   bool Damaged = false;
+   for (struct dirent *Ent = readdir(DirP); Ent != 0; Ent = readdir(DirP))
+   {
+      Damaged = true;
+      for (unsigned int I = 0; Ent->d_name[I] != 0; I++)
+      {
+	 // Check if its not a digit..
+	 if (isdigit(Ent->d_name[I]) == 0)
+	 {
+	    Damaged = false;
+	    break;
+	 }
+      }
+      if (Damaged == true)
+	 break;
+   }
+   closedir(DirP);
+
+   return Damaged;
+}
+									/*}}}*/
+// System::CreatePM - Create the underlying package manager		/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+pkgPackageManager *debSystem::CreatePM(pkgDepCache *Cache) const
+{
+   return new pkgDPkgPM(Cache);
+}
+									/*}}}*/
+// System::Initialize - Setup the configuration space..			/*{{{*/
+// ---------------------------------------------------------------------
+/* These are the Debian specific configuration variables.. */
+static std::string getDpkgStatusLocation(Configuration const &Cnf) {
+   Configuration PathCnf;
+   PathCnf.Set("Dir", Cnf.Find("Dir", "/"));
+   PathCnf.Set("Dir::State::status", "status");
+   auto const cnfstatedir = Cnf.Find("Dir::State", &STATE_DIR[1]);
+   // if the state dir ends in apt, replace it with dpkg -
+   // for the default this gives us the same as the fallback below.
+   // This can't be a ../dpkg as that would play bad with symlinks
+   std::string statedir;
+   if (APT::String::Endswith(cnfstatedir, "/apt/"))
+      statedir.assign(cnfstatedir, 0, cnfstatedir.length() - 5);
+   else if (APT::String::Endswith(cnfstatedir, "/apt"))
+      statedir.assign(cnfstatedir, 0, cnfstatedir.length() - 4);
+   if (statedir.empty())
+      PathCnf.Set("Dir::State", "var/lib/dpkg");
+   else
+      PathCnf.Set("Dir::State", flCombine(statedir, "dpkg"));
+   return PathCnf.FindFile("Dir::State::status");
+}
+bool debSystem::Initialize(Configuration &Cnf)
+{
+   /* These really should be jammed into a generic 'Local Database' engine
+      which is yet to be determined. The functions in pkgcachegen should
+      be the only users of these */
+   Cnf.CndSet("Dir::State::extended_states", "extended_states");
+   if (Cnf.Exists("Dir::State::status") == false)
+      Cnf.Set("Dir::State::status", getDpkgStatusLocation(Cnf));
+   Cnf.CndSet("Dir::Bin::dpkg",BIN_DIR"/dpkg");
+
+   if (d->StatusFile) {
+     delete d->StatusFile;
+     d->StatusFile = 0;
+   }
+
+   return true;
+}
+									/*}}}*/
+// System::ArchiveSupported - Is a file format supported		/*{{{*/
+// ---------------------------------------------------------------------
+/* The standard name for a deb is 'deb'.. There are no separate versions
+   of .deb to worry about.. */
+APT_PURE bool debSystem::ArchiveSupported(const char *Type)
+{
+   if (strcmp(Type,"deb") == 0)
+      return true;
+   return false;
+}
+									/*}}}*/
+// System::Score - Determine how 'Debiany' this sys is..		/*{{{*/
+// ---------------------------------------------------------------------
+/* We check some files that are sure tell signs of this being a Debian
+   System.. */
+signed debSystem::Score(Configuration const &Cnf)
+{
+   signed Score = 0;
+   if (FileExists(Cnf.FindFile("Dir::State::status",getDpkgStatusLocation(Cnf).c_str())) == true)
+       Score += 10;
+   if (FileExists(Cnf.Find("Dir::Bin::dpkg",BIN_DIR"/dpkg")) == true)
+      Score += 10;
+   if (FileExists("/etc/debian_version") == true)
+      Score += 10;
+   return Score;
+}
+									/*}}}*/
+// System::AddStatusFiles - Register the status files			/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool debSystem::AddStatusFiles(std::vector<pkgIndexFile *> &List)
+{
+   if (d->StatusFile == nullptr)
+   {
+      auto dpkgstatus = _config->FindFile("Dir::State::status");
+      if (dpkgstatus.empty())
+	 return true;
+      // we ignore only if the file doesn't exist, not if it is inaccessible
+      // e.g. due to permissions on parent directories as FileExists would do
+      errno = 0;
+      if (access(dpkgstatus.c_str(), R_OK) != 0 && errno == ENOENT)
+	 return true;
+      _error->PushToStack();
+      d->StatusFile = new debStatusIndex(std::move(dpkgstatus));
+      bool const errored = _error->PendingError();
+      _error->MergeWithStack();
+      if (errored)
+      {
+	 delete d->StatusFile;
+	 d->StatusFile = nullptr;
+	 return false;
+      }
+   }
+   List.push_back(d->StatusFile);
+   return true;
+}
+									/*}}}*/
+// System::FindIndex - Get an index file for status files		/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool debSystem::FindIndex(pkgCache::PkgFileIterator File,
+			  pkgIndexFile *&Found) const
+{
+   if (d->StatusFile == 0)
+      return false;
+   if (d->StatusFile->FindInCache(*File.Cache()) == File)
+   {
+      Found = d->StatusFile;
+      return true;
+   }
+   
+   return false;
+}
+									/*}}}*/
+std::string debSystem::StripDpkgChrootDirectory(std::string const &File)/*{{{*/
+{
+   // If the filename string begins with DPkg::Chroot-Directory, return the
+   // substr that is within the chroot so dpkg can access it.
+   std::string const chrootdir = _config->FindDir("DPkg::Chroot-Directory","/");
+   size_t len = chrootdir.length();
+   if (chrootdir == "/" || File.compare(0, len, chrootdir) != 0)
+      return File;
+   if (chrootdir.at(len - 1) == '/')
+      --len;
+   return File.substr(len);
+}
+									/*}}}*/
+std::string debSystem::GetDpkgExecutable()				/*{{{*/
+{
+   return StripDpkgChrootDirectory(_config->Find("Dir::Bin::dpkg","dpkg"));
+}
+									/*}}}*/
+std::vector<std::string> debSystem::GetDpkgBaseCommand()		/*{{{*/
+{
+   // Generate the base argument list for dpkg
+   std::vector<std::string> Args = { GetDpkgExecutable() };
+   // Stick in any custom dpkg options
+   Configuration::Item const *Opts = _config->Tree("DPkg::Options");
+   if (Opts != 0)
+   {
+      Opts = Opts->Child;
+      for (; Opts != 0; Opts = Opts->Next)
+      {
+	 if (Opts->Value.empty() == true)
+	    continue;
+	 Args.push_back(Opts->Value);
+      }
+   }
+   return Args;
+}
+									/*}}}*/
+void debSystem::DpkgChrootDirectory()					/*{{{*/
+{
+   std::string const chrootDir = _config->FindDir("DPkg::Chroot-Directory");
+   if (chrootDir == "/")
+      return;
+   std::cerr << "Chrooting into " << chrootDir << std::endl;
+   if (chroot(chrootDir.c_str()) != 0)
+      _exit(100);
+   if (chdir("/") != 0)
+      _exit(100);
+}
+									/*}}}*/
+pid_t debSystem::ExecDpkg(std::vector<std::string> const &sArgs, int * const inputFd, int * const outputFd, bool const DiscardOutput)/*{{{*/
+{
+   std::vector<const char *> Args(sArgs.size(), NULL);
+   std::transform(sArgs.begin(), sArgs.end(), Args.begin(), [](std::string const &s) { return s.c_str(); });
+   Args.push_back(NULL);
+
+   int external[2] = {-1, -1};
+   if (inputFd != nullptr || outputFd != nullptr)
+      if (pipe(external) != 0)
+      {
+	 _error->WarningE("dpkg", "Can't create IPC pipe for dpkg call");
+	 return -1;
+      }
+
+   pid_t const dpkg = ExecFork();
+   if (dpkg == 0) {
+      int const nullfd = open("/dev/null", O_RDWR);
+      if (inputFd == nullptr)
+	 dup2(nullfd, STDIN_FILENO);
+      else
+      {
+	 close(external[1]);
+	 dup2(external[0], STDIN_FILENO);
+      }
+      if (outputFd == nullptr)
+	 dup2(nullfd, STDOUT_FILENO);
+      else
+      {
+	 close(external[0]);
+	 dup2(external[1], STDOUT_FILENO);
+      }
+      if (DiscardOutput == true)
+	 dup2(nullfd, STDERR_FILENO);
+      debSystem::DpkgChrootDirectory();
+
+      if (_system != nullptr && _system->IsLocked() == true)
+      {
+	 setenv("DPKG_FRONTEND_LOCKED", "true", 1);
+      }
+
+      if (_config->Find("DPkg::Path", "").empty() == false)
+	 setenv("PATH", _config->Find("DPkg::Path", "").c_str(), 1);
+
+      execvp(Args[0], (char**) &Args[0]);
+      _error->WarningE("dpkg", "Can't execute dpkg!");
+      _exit(100);
+   }
+   if (outputFd != nullptr)
+   {
+      close(external[1]);
+      *outputFd = external[0];
+   }
+   else if (inputFd != nullptr)
+   {
+      close(external[0]);
+      *inputFd = external[1];
+   }
+   return dpkg;
+}
+									/*}}}*/
+bool debSystem::MultiArchSupported() const					/*{{{*/
+{
+   return AssertFeature("multi-arch");
+}
+									/*}}}*/
+bool debSystem::AssertFeature(std::string const &feature) /*{{{*/
+{
+   std::vector<std::string> Args = GetDpkgBaseCommand();
+   Args.push_back("--assert-" + feature);
+   pid_t const dpkgAssertMultiArch = ExecDpkg(Args, nullptr, nullptr, true);
+   if (dpkgAssertMultiArch > 0)
+   {
+      int Status = 0;
+      while (waitpid(dpkgAssertMultiArch, &Status, 0) != dpkgAssertMultiArch)
+      {
+	 if (errno == EINTR)
+	    continue;
+	 _error->WarningE("dpkgGo", _("Waited for %s but it wasn't there"), "dpkg --assert-multi-arch");
+	 break;
+      }
+      if (WIFEXITED(Status) == true && WEXITSTATUS(Status) == 0)
+	 return true;
+   }
+   return false;
+}
+									/*}}}*/
+std::vector<std::string> debSystem::ArchitecturesSupported() const		/*{{{*/
+{
+   std::vector<std::string> archs;
+   {
+      string const arch = _config->Find("APT::Architecture");
+      if (arch.empty() == false)
+	 archs.push_back(std::move(arch));
+   }
+
+   std::vector<std::string> sArgs = GetDpkgBaseCommand();
+   sArgs.push_back("--print-foreign-architectures");
+   int outputFd = -1;
+   pid_t const dpkgMultiArch = ExecDpkg(sArgs, nullptr, &outputFd, true);
+   if (dpkgMultiArch == -1)
+      return archs;
+
+   FILE *dpkg = fdopen(outputFd, "r");
+   if(dpkg != NULL) {
+      char* buf = NULL;
+      size_t bufsize = 0;
+      while (getline(&buf, &bufsize, dpkg) != -1)
+      {
+	 char* tok_saveptr;
+	 char* arch = strtok_r(buf, " ", &tok_saveptr);
+	 while (arch != NULL) {
+	    for (; isspace_ascii(*arch) != 0; ++arch);
+	    if (arch[0] != '\0') {
+	       char const* archend = arch;
+	       for (; isspace_ascii(*archend) == 0 && *archend != '\0'; ++archend);
+	       string a(arch, (archend - arch));
+	       if (std::find(archs.begin(), archs.end(), a) == archs.end())
+		  archs.push_back(a);
+	    }
+	    arch = strtok_r(NULL, " ", &tok_saveptr);
+	 }
+      }
+      free(buf);
+      fclose(dpkg);
+   }
+   ExecWait(dpkgMultiArch, "dpkg --print-foreign-architectures", true);
+   return archs;
+}
+									/*}}}*/