[PATCH v7 11/11] gnulib-tool: fall back into copy if symbolic link is not supported

[KO Myung-Hun]

And warn about it only once.

* gnulib-tool (first_fall_back_to_cp_warn): New. Indicator for only
once warning about falling back to cp -p.
(func_ln_s): New. Fall back into cp -p if ln -s fails. And warn about
this only once.
(func_ln): Replace ln -s with func_ln_s.
---
 gnulib-tool | 35 +++++++++++++++++++++++++++++++----
 1 file changed, 31 insertions(+), 4 deletions(-)

diff --git a/gnulib-tool b/gnulib-tool
index 34676f9..2c7d9d3 100755
--- a/gnulib-tool
+++ b/gnulib-tool
@@ -767,23 +767,50 @@ func_relconcat ()
   done
 }
 
+first_fall_back_to_cp_warn=true
+
+# func_ln_s SRC DEST
+# Like ln -s, except that cp -p is used if ln -s fails.
+func_ln_s ()
+{
+  if ln -s "$1" "$2" 2>/dev/null; then
+    :
+  else
+    if $first_fall_back_to_cp_warn; then
+      echo "gnulib-tool: symbolic link is not supported on this system." 1>&2
+      echo "Copy will be performed instead." 1>&2
+
+      first_fall_back_to_cp_warn=false
+    fi
+
+    case "$1" in
+      /* | ?:*) # SRC is absolute.
+        cp_src="$1" ;;
+      *) # SRC is relative to the directory of DEST.
+        cp_src="`echo "$2" | sed -e 's,\(^.*\)/[^/]*$,\1,'`/$1" ;;
+    esac
+
+    cp -p "$cp_src" "$2"
+  fi
+}
+
 # func_ln SRC DEST
-# Like ln -s, except that SRC is given relative to the current directory (or
+# Like func_ln_s, except that SRC is given relative to the current directory 
(or
 # absolute), not given relative to the directory of DEST.
 func_ln ()
 {
   case "$1" in
     /* | ?:*)
-      ln -s "$1" "$2" ;;
+      func_ln_s "$1" "$2" ;;
     *) # SRC is relative.
       case "$2" in
         /* | ?:*)
-          ln -s "`pwd`/$1" "$2" ;;
+          func_ln_s "`pwd`/$1" "$2" ;;
         *) # DEST is relative too.
           ln_destdir=`echo "$2" | sed -e 's,[^/]*$,,'`
           test -n "$ln_destdir" || ln_destdir="."
           func_relativize "$ln_destdir" "$1"
-          ln -s "$reldir" "$2"
+          func_ln_s "$reldir" "$2"
           ;;
       esac
       ;;
-- 
2.7.0