introduce configure option for TMPDIR

configure.ac

@@ -29,6 +29,24 @@ PKG_CHECK_MODULES(
 AC_SUBST([LIBUSB1_CFLAGS])
 AC_SUBST([LIBUSB1_LIBS])
 
+dnl Configurable temporary directory
+AC_ARG_WITH(
+    [tmpdir],
+    [AS_HELP_STRING([--with-tmpdir@<:=DIR@:>@],
+        [Directory for temporary files, defaults to /tmp])],
+    [], []
+)
+AS_IF(
+    [test "x$withval" != "x"],
+    [tmpdir="$withval"],
+    [tmpdir="/tmp"]
+)
+AC_DEFINE_UNQUOTED(
+    [TMPDIR],
+    ["${tmpdir}"],
+    [Directory for temporary files]
+)
+
 AC_OUTPUT([
     makefile
     src/makefile

src/simple-mtpfs-fuse.cpp

@@ -782,7 +782,7 @@ bool SMTPFileSystem::createTmpDir()
     } else {
         c_tmp = getenv("TMPDIR");
         if (!c_tmp)
-            c_tmp = "/tmp";
+            c_tmp = TMPDIR;
         tmp_dir = smtpfs_realpath(c_tmp);
     }
 

src/simple-mtpfs-tmp-files-pool.cpp

@@ -22,7 +22,7 @@
 #include "simple-mtpfs-sha1.h"
 
 TmpFilesPool::TmpFilesPool():
-    m_tmp_path("/tmp/simple-mtpfs"),
+    m_tmp_path(TMPDIR "/simple-mtpfs"),
     m_pool()
 {
 }