Update genbuild.sh

Author: vashshawn

share/genbuild.sh

@@ -1,10 +1,12 @@
 #!/bin/sh
-# Needs root
+
 if [ $# -gt 0 ]; then
     FILE="$1"
     shift
     if [ -f "$FILE" ]; then
         INFO="$(head -n 1 "$FILE")"
+    else
+        INFO=""
     fi
 else
     echo "Usage: $0 <filename>"
@@ -13,13 +15,16 @@ fi
 
 if [ -e "$(which git)" ]; then
     # clean 'dirty' status of touched files that haven't been modified
-    git diff >/dev/null 2>/dev/null 
+    git diff >/dev/null 2>/dev/null
 
     # get a string like "v0.6.0-66-g59887e8-dirty"
     DESC="$(git describe --dirty 2>/dev/null)"
 
     # get a string like "2012-04-10 16:27:19 +0200"
     TIME="$(git log -n 1 --format="%ci")"
+else
+    DESC=""
+    TIME=""
 fi
 
 if [ -n "$DESC" ]; then
@@ -31,5 +36,7 @@ fi
 # only update build.h if necessary
 if [ "$INFO" != "$NEWINFO" ]; then
     echo "$NEWINFO" >"$FILE"
-    echo "#define BUILD_DATE \"$TIME\"" >>"$FILE"
+     if [ -n "$TIME" ]; then
+        echo "#define BUILD_DATE \"$TIME\"" >>"$FILE"
+    fi
 fi