add TMP/TEMP/TEMPDIR to the TMPDIR DropPrivileges dance

apt tools do not really support these other variables, but tools apt
calls might, so lets play save and clean those up as needed.

Reported-By: Paul Wise (pabs) on IRC
(cherry picked from commit e2c8c825a5470e33c25d00e07de188d0e03922c8)

1 files changed, 20 insertions, 9 deletions

diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index d52e9b360..affab956c 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -2778,9 +2778,9 @@ std::vector<std::string> Glob(std::string const &pattern, int flags)
    return result;
 }
 									/*}}}*/
-std::string GetTempDir()						/*{{{*/
+static std::string APT_NONNULL(1) GetTempDirEnv(char const * const env)	/*{{{*/
 {
-   const char *tmpdir = getenv("TMPDIR");
+   const char *tmpdir = getenv(env);
 
 #ifdef P_tmpdir
    if (!tmpdir)
@@ -2797,6 +2797,11 @@ std::string GetTempDir()						/*{{{*/
 
    return string(tmpdir);
 }
+									/*}}}*/
+std::string GetTempDir()						/*{{{*/
+{
+   return GetTempDirEnv("TMPDIR");
+}
 std::string GetTempDir(std::string const &User)
 {
    // no need/possibility to drop privs
@@ -3062,13 +3067,19 @@ bool DropPrivileges()							/*{{{*/
 	 setenv("SHELL", "/bin/sh", 1);
       else
 	 setenv("SHELL", pw->pw_shell, 1);
-      auto const tmpdir = getenv("TMPDIR");
-      if (tmpdir != nullptr)
-      {
-	 auto const ourtmpdir = GetTempDir();
-	 if (ourtmpdir != tmpdir)
-	    setenv("TMPDIR", ourtmpdir.c_str(), 1);
-      }
+      auto const apt_setenv_tmp = [](char const * const env) {
+	 auto const tmpdir = getenv(env);
+	 if (tmpdir != nullptr)
+	 {
+	    auto const ourtmpdir = GetTempDirEnv(env);
+	    if (ourtmpdir != tmpdir)
+	       setenv(env, ourtmpdir.c_str(), 1);
+	 }
+      };
+      apt_setenv_tmp("TMPDIR");
+      apt_setenv_tmp("TEMPDIR");
+      apt_setenv_tmp("TMP");
+      apt_setenv_tmp("TEMP");
    }
 
    return true;