use Makefile instead of 'build'

1 files changed, 72 insertions, 0 deletions

diff --git a/image-digestor.sh b/image-digestor.sh
new file mode 100755
index 0000000..793342a
--- /dev/null
+++ b/image-digestor.sh
@@ -0,0 +1,72 @@
+#!/bin/bash -e
+#
+# Copyright © 2008  Andres Salomon <dilinger@queued.net>
+#
+# This file is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+check_for_cmds()
+{
+	for cmd in $@; do
+		which $cmd >/dev/null || {
+			echo "Missing required command '$cmd'!" 1>&2
+			return 1
+		}
+	done
+
+	return 0
+}
+
+check_for_cmds dd sha256sum
+
+usage()
+{
+	echo "" 1>&2
+	echo "Usage: $0 <img>" 1>&2
+    echo "Produces <img_basename>.plc"
+    echo "For use in secure reflash, the resulting placement control file"
+    echo "(*.plc) must be included as data.img in an OLPC-signed fs.zip."
+	echo "" 1>&2
+	exit 1
+}
+
+if [ "$#" != "1" ]; then
+	usage
+fi
+
+IMAGE_FILE_NAME=$1
+IMAGE_FILE_BASENAME=`basename $IMAGE_FILE_NAME`
+PLACEMENT_CONTROL_FILE=${IMAGE_FILE_BASENAME/.img/.plc}
+
+
+do_sha256()
+{
+	f=$1
+	eblocks=$((`stat --printf "%s\n" $f` / (128*1024)))
+	for b in $(seq 0 $(($eblocks - 1))); do
+		sha=$(dd status=noxfer bs=128KiB skip=$b count=1 if=$f 2>/dev/null | sha256sum | cut -d\  -f1)
+		echo "eblock: `printf '%x' $b` sha256 $sha" >> ${PLACEMENT_CONTROL_FILE}
+	done
+}
+
+cat >${PLACEMENT_CONTROL_FILE}<<EOF
+data:  ${IMAGE_FILE_BASENAME}
+erase-all
+mark-pending: 0
+EOF
+do_sha256 "${IMAGE_FILE_NAME}"
+cat >>${PLACEMENT_CONTROL_FILE}<<EOF
+cleanmarkers
+mark-complete: 0
+EOF