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-rw-r--r--apt-pkg/deb/debsystem.cc557
1 files changed, 557 insertions, 0 deletions
diff --git a/apt-pkg/deb/debsystem.cc b/apt-pkg/deb/debsystem.cc
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+// -*- 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;
+}
+ /*}}}*/