- if (unlikely(arch.empty() == true))
- return archs;
-
- // FIXME: It is a bit unclean to have debian specific code here…
- if (archs.empty() == true) {
- archs.push_back(arch);
-
- // Generate the base argument list for dpkg
- std::vector<const char *> Args;
- 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);
- }
- }
- Args.push_back(Tmp.c_str());
-
- // 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.c_str());
- }
- }
-
- Args.push_back("--print-foreign-architectures");
- Args.push_back(NULL);
-
- int external[2] = {-1, -1};
- if (pipe(external) != 0)
- {
- _error->WarningE("getArchitecture", "Can't create IPC pipe for dpkg --print-foreign-architectures");
- return archs;
- }
-
- pid_t dpkgMultiArch = ExecFork();
- if (dpkgMultiArch == 0) {
- close(external[0]);
- std::string const chrootDir = _config->FindDir("DPkg::Chroot-Directory");
- int const nullfd = open("/dev/null", O_RDONLY);
- dup2(nullfd, STDIN_FILENO);
- dup2(external[1], STDOUT_FILENO);
- dup2(nullfd, STDERR_FILENO);
- if (chrootDir != "/" && chroot(chrootDir.c_str()) != 0 && chdir("/") != 0)
- _error->WarningE("getArchitecture", "Couldn't chroot into %s for dpkg --print-foreign-architectures", chrootDir.c_str());
- execvp(Args[0], (char**) &Args[0]);
- _error->WarningE("getArchitecture", "Can't detect foreign architectures supported by dpkg!");
- _exit(100);
- }
- close(external[1]);
-
- FILE *dpkg = fdopen(external[0], "r");
- if(dpkg != NULL) {
- char buf[1024];
- while (fgets(buf, sizeof(buf), dpkg) != NULL) {
- char* arch = strtok(buf, " ");
- while (arch != NULL) {
- for (; isspace(*arch) != 0; ++arch);
- if (arch[0] != '\0') {
- char const* archend = arch;
- for (; isspace(*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(NULL, " ");
- }
- }
- fclose(dpkg);
- }
- ExecWait(dpkgMultiArch, "dpkg --print-foreign-architectures", true);
- return archs;
- }