ExecGPGV: Fork in all cases

[apt.git] / apt-pkg / contrib / gpgv.cc

diff --git a/apt-pkg/contrib/gpgv.cc b/apt-pkg/contrib/gpgv.cc
index 0929ae0e2c06c40922548c5ae6a27e2e2dbc3f2c..4247a1562073e983901cb997ba28d641810b3c51 100644 (file)
--- a/apt-pkg/contrib/gpgv.cc
+++ b/apt-pkg/contrib/gpgv.cc
@@ -47,9 +47,17 @@ void ExecGPGV(std::string const &File, std::string const &FileGPG,
              int const &statusfd, int fd[2], std::string const &key)
 {
    #define EINTERNAL 111
-   std::string const aptkey = _config->FindFile("Dir::Bin::apt-key", "/usr/bin/apt-key");
+   std::string const aptkey = _config->Find("Dir::Bin::apt-key", "/usr/bin/apt-key");
 
    bool const Debug = _config->FindB("Debug::Acquire::gpgv", false);
+   struct exiter {
+      std::vector<const char *> files;
+      void operator ()(int code) APT_NORETURN {
+        std::for_each(files.begin(), files.end(), unlink);
+        exit(code);
+      }
+   } local_exit;
+
 
    std::vector<const char *> Args;
    Args.reserve(10);
@@ -110,19 +118,19 @@ void ExecGPGV(std::string const &File, std::string const &FileGPG,
       if (sig == NULL || data == NULL)
       {
         ioprintf(std::cerr, "Couldn't create tempfile names for splitting up %s", File.c_str());
-        exit(EINTERNAL);
+        local_exit(EINTERNAL);
       }
 
       int const sigFd = mkstemp(sig);
       int const dataFd = mkstemp(data);
+      if (dataFd != -1)
+        local_exit.files.push_back(data);
+      if (sigFd != -1)
+        local_exit.files.push_back(sig);
       if (sigFd == -1 || dataFd == -1)
       {
-        if (dataFd != -1)
-           unlink(sig);
-        if (sigFd != -1)
-           unlink(data);
         ioprintf(std::cerr, "Couldn't create tempfiles for splitting up %s", File.c_str());
-        exit(EINTERNAL);
+        local_exit(EINTERNAL);
       }
 
       FileFd signature;
@@ -133,12 +141,8 @@ void ExecGPGV(std::string const &File, std::string const &FileGPG,
       if (signature.Failed() == true || message.Failed() == true ||
            SplitClearSignedFile(File, &message, &dataHeader, &signature) == false)
       {
-        if (dataFd != -1)
-           unlink(sig);
-        if (sigFd != -1)
-           unlink(data);
         ioprintf(std::cerr, "Splitting up %s into data and signature failed", File.c_str());
-        exit(112);
+        local_exit(112);
       }
       Args.push_back(sig);
       Args.push_back(data);
@@ -171,67 +175,49 @@ void ExecGPGV(std::string const &File, std::string const &FileGPG,
       putenv((char *)"LC_MESSAGES=");
    }
 
-   if (releaseSignature == DETACHED)
+
+   // We have created tempfiles we have to clean up
+   // and we do an additional check, so fork yet another time …
+   pid_t pid = ExecFork();
+   if(pid < 0) {
+      ioprintf(std::cerr, "Fork failed for %s to check %s", Args[0], File.c_str());
+      local_exit(EINTERNAL);
+   }
+   if(pid == 0)
    {
+      if (statusfd != -1)
+        dup2(fd[1], statusfd);
       execvp(Args[0], (char **) &Args[0]);
       ioprintf(std::cerr, "Couldn't execute %s to check %s", Args[0], File.c_str());
-      exit(EINTERNAL);
+      local_exit(EINTERNAL);
    }
-   else
-   {
-//#define UNLINK_EXIT(X) exit(X)
-#define UNLINK_EXIT(X) unlink(sig);unlink(data);exit(X)
-
-      // for clear-signed files we have created tempfiles we have to clean up
-      // and we do an additional check, so fork yet another time …
-      pid_t pid = ExecFork();
-      if(pid < 0) {
-        ioprintf(std::cerr, "Fork failed for %s to check %s", Args[0], File.c_str());
-        UNLINK_EXIT(EINTERNAL);
-      }
-      if(pid == 0)
-      {
-        if (statusfd != -1)
-           dup2(fd[1], statusfd);
-        execvp(Args[0], (char **) &Args[0]);
-        ioprintf(std::cerr, "Couldn't execute %s to check %s", Args[0], File.c_str());
-        UNLINK_EXIT(EINTERNAL);
-      }
 
-      // Wait and collect the error code - taken from WaitPid as we need the exact Status
-      int Status;
-      while (waitpid(pid,&Status,0) != pid)
-      {
-        if (errno == EINTR)
-           continue;
-        ioprintf(std::cerr, _("Waited for %s but it wasn't there"), "apt-key");
-        UNLINK_EXIT(EINTERNAL);
-      }
-#undef UNLINK_EXIT
-      // we don't need the files any longer
-      unlink(sig);
-      unlink(data);
-      free(sig);
-      free(data);
-
-      // check if it exit'ed normally …
-      if (WIFEXITED(Status) == false)
-      {
-        ioprintf(std::cerr, _("Sub-process %s exited unexpectedly"), "apt-key");
-        exit(EINTERNAL);
-      }
+   // Wait and collect the error code - taken from WaitPid as we need the exact Status
+   int Status;
+   while (waitpid(pid,&Status,0) != pid)
+   {
+      if (errno == EINTR)
+        continue;
+      ioprintf(std::cerr, _("Waited for %s but it wasn't there"), "apt-key");
+      local_exit(EINTERNAL);
+   }
 
-      // … and with a good exit code
-      if (WEXITSTATUS(Status) != 0)
-      {
-        ioprintf(std::cerr, _("Sub-process %s returned an error code (%u)"), "apt-key", WEXITSTATUS(Status));
-        exit(WEXITSTATUS(Status));
-      }
+   // check if it exit'ed normally …
+   if (WIFEXITED(Status) == false)
+   {
+      ioprintf(std::cerr, _("Sub-process %s exited unexpectedly"), "apt-key");
+      local_exit(EINTERNAL);
+   }
 
-      // everything fine
-      exit(0);
+   // … and with a good exit code
+   if (WEXITSTATUS(Status) != 0)
+   {
+      ioprintf(std::cerr, _("Sub-process %s returned an error code (%u)"), "apt-key", WEXITSTATUS(Status));
+      local_exit(WEXITSTATUS(Status));
    }
-   exit(EINTERNAL); // unreachable safe-guard
+
+   // everything fine
+   local_exit(0);
 }
                                                                        /*}}}*/
 // SplitClearSignedFile - split message into data/signature            /*{{{*/