copy-firmware: Create symlinks from WHENCE file

Rather than require symlinks to be created in the filesystem and have
duplicate Link: entries in the WHENCE file, make copy-firmware.sh create
the symlinks on the fly.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

copy-firmware.sh

@@ -5,12 +5,31 @@
 #
 
 verbose=:
-if [ x"$1" = x"-v" ]; then
-    verbose=echo
-    shift
-fi
+prune=no
 
-destdir="$1"
+while test $# -gt 0; do
+    case $1 in
+        -v | --verbose)
+            verbose=echo
+            shift
+            ;;
+
+        -P | --prune)
+            prune=yes
+            shift
+            ;;
+
+        *)
+            if test "x$destdir" != "x"; then
+                echo "ERROR: unknown command-line options: $@"
+                exit 1
+            fi
+
+            destdir="$1"
+            shift
+            ;;
+    esac
+done
 
 grep '^File:' WHENCE | sed -e's/^File: *//g' -e's/"//g' | while read f; do
     test -f "$f" || continue
@@ -20,11 +39,36 @@ grep '^File:' WHENCE | sed -e's/^File: *//g' -e's/"//g' | while read f; do
 done
 
 grep -E '^Link:' WHENCE | sed -e's/^Link: *//g' -e's/-> //g' | while read f d; do
-    test -L "$f" || continue
-    test -f "$destdir/$f" && continue
-    $verbose "copying link $f"
-    mkdir -p $destdir/$(dirname "$f")
-    cp -d "$f" $destdir/"$f"
+    if test -L "$f"; then
+        test -f "$destdir/$f" && continue
+        $verbose "copying link $f"
+        mkdir -p $destdir/$(dirname "$f")
+        cp -d "$f" $destdir/"$f"
+
+        if test "x$d" != "x"; then
+            target=`readlink "$f"`
+
+            if test "x$target" != "x$d"; then
+                $verbose "WARNING: inconsistent symlink target: $target != $d"
+            else
+                if test "x$prune" != "xyes"; then
+                    $verbose "WARNING: unneeded symlink detected: $f"
+                else
+                    $verbose "WARNING: pruning unneeded symlink $f"
+                    rm -f "$f"
+                fi
+            fi
+        else
+            $verbose "WARNING: missing target for symlink $f"
+        fi
+    else
+        test -f "$destdir/$f" && continue
+        $verbose "creating link $f -> $d"
+        mkdir -p $destdir/$(dirname "$f")
+        ln -sf "$d" "$destdir/$f"
+    fi
 done
 
 exit 0
+
+# vim: et sw=4 sts=4 ts=4