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-rw-r--r--apt-pkg/deb/debsystem.cc93
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;
+}
+ /*}}}*/