[tyndur-devel] [PATCH 1 of 2] build: dd if='/dev/zero' ... ist zu langsam

[Andreas Freimuth <m.nemo@xxxxxxx>]

* Beim Erstellen von leeren Images auf dd verzichten, statt dessen ein
  kleines Python-Script verwenden

Signed-off-by: Andreas Freimuth <m.nemo@xxxxxxx>
---
 build/scripts/empty_file   |  24 ++++++++++++++++++++++++
 build/scripts/image_cdrom  |   2 +-
 build/scripts/image_floppy |   2 +-
 build/scripts/image_hd     |   4 ++--
 4 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/build/scripts/empty_file b/build/scripts/empty_file
new file mode 100755
--- /dev/null
+++ b/build/scripts/empty_file
@@ -0,0 +1,24 @@
+#!/usr/bin/python
+# -*- coding: UTF-8 -*-
+
+# Eine leere Datei mit einer bestimmten Größe erzeugen
+# Parameter:
+#   1. Dateiname
+#   2. Dateigröße
+import sys
+
+def empty_file(filename, size):
+    f = open(filename,"wb")
+    if not f:
+        sys.exit(1)
+
+    f.seek(size - 1)
+    f.write('\0')
+    f.close()
+
+if __name__ == "__main__":
+    if len(sys.argv[1:]) != 2:
+        print sys.stderr, "using: %s <filename> <size>" % sys.argv[0]
+        sys.exit(1)
+
+    empty_file(str(sys.argv[1]), int(sys.argv[2]))
diff --git a/build/scripts/image_cdrom b/build/scripts/image_cdrom
--- a/build/scripts/image_cdrom
+++ b/build/scripts/image_cdrom
@@ -96,7 +96,7 @@ EOF
 NEW=0
 if ! [ -f $FLOPPY_IMAGE_PATH ]; then
     # Leeres Image erstellen und formatieren
-    dd if=/dev/zero of=$FLOPPY_IMAGE_PATH bs=1024 count=1440
+    build/scripts/empty_file $FLOPPY_IMAGE_PATH $((1024 * 1440))
     mformat l:
     NEW=1
 fi
diff --git a/build/scripts/image_floppy b/build/scripts/image_floppy
--- a/build/scripts/image_floppy
+++ b/build/scripts/image_floppy
@@ -58,7 +58,7 @@ EOF
 NEW=0
 if ! [ -f $IMAGE_PATH ]; then
     # Leeres Image erstellen und formatieren
-    dd if=/dev/zero of=$IMAGE_PATH bs=1024 count=1440
+    build/scripts/empty_file $IMAGE_PATH $((1024 * 1440))
     mformat l:
     NEW=1
 fi
diff --git a/build/scripts/image_hd b/build/scripts/image_hd
--- a/build/scripts/image_hd
+++ b/build/scripts/image_hd
@@ -57,7 +57,7 @@ die()
 NEW=0
 if ! [ -f $IMAGE_PATH ]; then
     # Leeres Image erstellen und formatieren
-    dd if=/dev/zero of=$IMAGE_PATH bs=$((1024*1024)) count=$IMAGE_SIZE 2> /dev/null
+    build/scripts/empty_file $IMAGE_PATH $(($IMAGE_SIZE * 1024 * 1024))
     build/scripts/create_partition $IMAGE_PATH
     NEW=1
 fi
@@ -70,7 +70,7 @@ PART_SIZE=`echo $PARTITIONS | awk '{prin
 
 if [ $NEW -ne 0 ]; then
     PART_IMAGE=`mktemp`
-    dd if=$IMAGE_PATH of=$PART_IMAGE bs=512 skip=$PART_START count=$PART_SIZE
+    build/scripts/empty_file $PART_IMAGE $(($PART_SIZE * 512))
 
     # Dateisystem erstellen
     $LOST_TOOLS_MKE2FS -F -q $PART_IMAGE || die "Dateisystem konnte nicht erstellt werden"