diff options
Diffstat (limited to 'apt-pkg/deb/debsystem.cc')
| -rw-r--r-- | apt-pkg/deb/debsystem.cc | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/apt-pkg/deb/debsystem.cc b/apt-pkg/deb/debsystem.cc index 465e13b9e..5353761fc 100644 --- a/apt-pkg/deb/debsystem.cc +++ b/apt-pkg/deb/debsystem.cc @@ -22,6 +22,8 @@ #include <apt-pkg/pkgcache.h> #include <apt-pkg/cacheiterators.h> +#include <algorithm> + #include <ctype.h> #include <stdlib.h> #include <string.h> @@ -30,6 +32,10 @@ #include <unistd.h> #include <dirent.h> #include <errno.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/wait.h> +#include <fcntl.h> #include <apti18n.h> /*}}}*/ @@ -250,3 +256,90 @@ bool debSystem::FindIndex(pkgCache::PkgFileIterator File, return false; } /*}}}*/ + +std::string debSystem::GetDpkgExecutable() /*{{{*/ +{ + string Tmp = _config->Find("Dir::Bin::dpkg","dpkg"); + string const dpkgChrootDir = _config->FindDir("DPkg::Chroot-Directory", "/"); + size_t dpkgChrootLen = dpkgChrootDir.length(); + if (dpkgChrootDir != "/" && Tmp.find(dpkgChrootDir) == 0) + { + if (dpkgChrootDir[dpkgChrootLen - 1] == '/') + --dpkgChrootLen; + Tmp = Tmp.substr(dpkgChrootLen); + } + return Tmp; +} + /*}}}*/ +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); +} + /*}}}*/ +bool debSystem::SupportsMultiArch() /*{{{*/ +{ + // Generate the base argument list for dpkg + std::vector<std::string> const Args = GetDpkgBaseCommand(); + std::vector<const char *> cArgs(Args.size(), NULL); + std::transform(Args.begin(), Args.end(), cArgs.begin(), [](std::string const &s) { return s.c_str(); }); + + // we need to detect if we can qualify packages with the architecture or not + cArgs.push_back("--assert-multi-arch"); + cArgs.push_back(NULL); + + pid_t dpkgAssertMultiArch = ExecFork(); + if (dpkgAssertMultiArch == 0) + { + DpkgChrootDirectory(); + // redirect everything to the ultimate sink as we only need the exit-status + int const nullfd = open("/dev/null", O_RDONLY); + dup2(nullfd, STDIN_FILENO); + dup2(nullfd, STDOUT_FILENO); + dup2(nullfd, STDERR_FILENO); + execvp(cArgs[0], (char**) &cArgs[0]); + _error->WarningE("dpkgGo", "Can't detect if dpkg supports multi-arch!"); + _exit(2); + } + + 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; +} + /*}}}*/ |