test if TMPDIR is accessible before using

[apt.git] / cmdline / apt-key.in

diff --git a/cmdline/apt-key.in b/cmdline/apt-key.in
index 7a3852ee89584472382b78c1f5299dde284f5230..cf0b9a96f75960081d8a8bc2afb8dc5d08a2bca0 100644 (file)
--- a/cmdline/apt-key.in
+++ b/cmdline/apt-key.in
@@ -384,8 +384,12 @@ if [ "$command" != "help" ]; then
 
     # gpg needs (in different versions more or less) files to function correctly,
     # so we give it its own homedir and generate some valid content for it
-    if [ ! -d "$TMPDIR" ]; then
-        unset TMPDIR
+    if [ -n "$TMPDIR" ]; then
+       # tmpdir is a directory and current user has rwx access to it
+       # same tests as in apt-pkg/contrib/fileutl.cc GetTempDir()
+       if [ ! -d "$TMPDIR" ] || [ ! -r "$TMPDIR" ] || [ ! -w "$TMPDIR" ] || [ ! -x "$TMPDIR" ]; then
+         unset TMPDIR
+       fi
     fi
     GPGHOMEDIR="$(mktemp -d)"
     CURRENTTRAP="${CURRENTTRAP} rm -rf '${GPGHOMEDIR}';"