Merge branch 'tr/fd-gotcha-fixes'

Finishing touches to an earlier fix already in 'master'.

* tr/fd-gotcha-fixes:
t0070: test that git_mkstemps correctly checks return value of open()

diff --combined t/t0070-fundamental.sh
index 986b2a8f2664b1734964049a5b24fc50cf938cfe,ff3776fcb82010e25f31455eac5b678c096b8a1a..5ed69a6f566bf3a7944b41bace4cfbe26d015040
--- 1/t/t0070-fundamental.sh
--- 2/t/t0070-fundamental.sh
+++ b/t/t0070-fundamental.sh
@@@ -17,7 -17,7 +17,7 @@@ test_expect_success 'mktemp to nonexist
        grep "doesnotexist/test" err
  '
  
 -test_expect_success POSIXPERM 'mktemp to unwritable directory prints filename' '
 +test_expect_success POSIXPERM,SANITY 'mktemp to unwritable directory prints filename' '
        mkdir cannotwrite &&
        chmod -w cannotwrite &&
        test_when_finished "chmod +w cannotwrite" &&
@@@ -25,6 -25,10 +25,10 @@@
        grep "cannotwrite/test" err
  '
  
+ test_expect_success 'git_mkstemps_mode does not fail if fd 0 is not open' '
+       git commit --allow-empty -m message <&-
+ '
+ 
  test_expect_success 'check for a bug in the regex routines' '
        # if this test fails, re-build git with NO_REGEX=1
        test-regex