From 7fa54e34222fc52cf200300a4dc781c54884340b Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Fri, 25 Mar 2016 12:54:36 -0700
Subject: [PATCH] * tests/init.sh: Sync from Gnulib.

---
 tests/init.sh | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/tests/init.sh b/tests/init.sh
index ee08022..97e4e4b 100644
--- a/tests/init.sh
+++ b/tests/init.sh
@@ -308,13 +308,19 @@ if diff_out_=`exec 2>/dev/null; diff -u "$0" "$0" < /dev/null` \
       fi
     }
   fi
-elif diff_out_=`exec 2>/dev/null; diff -c "$0" "$0" < /dev/null`; then
+elif
+  for diff_opt_ in -U3 -c '' no; do
+    test "$diff_opt_" = no && break
+    diff_out_=`exec 2>/dev/null; diff $diff_opt_ "$0" "$0" </dev/null` && break
+  done
+  test "$diff_opt_" != no
+then
   if test -z "$diff_out_"; then
-    compare_ () { diff -c "$@"; }
+    compare_ () { diff $diff_opt_ "$@"; }
   else
     compare_ ()
     {
-      if diff -c "$@" > diff.out; then
+      if diff $diff_opt_ "$@" > diff.out; then
         # No differences were found, but AIX and HP-UX 'diff' produce output
         # "No differences encountered" or "There are no differences between the
         # files.". Hide this output.
@@ -466,7 +472,6 @@ setup_ ()
   fi
 
   initial_cwd_=$PWD
-  fail=0
 
   pfx_=`testdir_prefix_`
   test_dir_=`mktempd_ "$initial_cwd_" "$pfx_-$ME_.XXXX"` \
@@ -550,8 +555,9 @@ mktempd_ ()
   # Disallow any trailing slash on specified destdir:
   # it would subvert the post-mktemp "case"-based destdir test.
   case $destdir_ in
-  /) ;;
+  / | //) destdir_slash_=$destdir;;
   */) fail_ "invalid destination dir: remove trailing slash(es)";;
+  *) destdir_slash_=$destdir_/;;
   esac
 
   case $template_ in
@@ -561,20 +567,17 @@ mktempd_ ()
   esac
 
   # First, try to use mktemp.
-  d=`unset TMPDIR; { mktemp -d -t -p "$destdir_" "$template_"; } 2>/dev/null` \
-    || fail=1
+  d=`unset TMPDIR; { mktemp -d -t -p "$destdir_" "$template_"; } 2>/dev/null` &&
 
   # The resulting name must be in the specified directory.
-  case $d in "$destdir_"*);; *) fail=1;; esac
+  case $d in "$destdir_slash_"*) :;; *) false;; esac &&
 
   # It must have created the directory.
-  test -d "$d" || fail=1
+  test -d "$d" &&
 
   # It must have 0700 permissions.  Handle sticky "S" bits.
-  perms=`ls -dgo "$d" 2>/dev/null|tr S -` || fail=1
-  case $perms in drwx------*) ;; *) fail=1;; esac
-
-  test $fail = 0 && {
+  perms=`ls -dgo "$d" 2>/dev/null` &&
+  case $perms in drwx--[-S]---*) :;; *) false;; esac && {
     echo "$d"
     return
   }
@@ -593,7 +596,7 @@ mktempd_ ()
   i_=1
   while :; do
     X_=`rand_bytes_ $nx_`
-    candidate_dir_="$destdir_/$base_template_$X_"
+    candidate_dir_="$destdir_slash_$base_template_$X_"
     err_=`mkdir -m 0700 "$candidate_dir_" 2>&1` \
       && { echo "$candidate_dir_"; return; }
     test $MAX_TRIES_ -le $i_ && break;
-- 
2.30.2