source: hybrid/branches/releng-9/nanobsd/files/tools/update-file@ 12681

Last change on this file since 12681 was 10136, checked in by richardvm, 13 years ago

domme toevoeging van proxy files

  • Property svn:executable set to *
File size: 1.6 KB
Line 
1#!/bin/sh
2#
3# Update an single file (content via stdin) on the flash disk if the md5 does
4# not match. This script tries to be on the safe side by checking md5 at
5# various stages.
6#
7# TODO: Maybe rsync is also able to perform the mount and umount before and
8# after, this will eliminate all the hacking with md5 checks.
9#
10# Rick van der Zwet <info@rickvanderzwet.nl>
11#
12
13if [ -z "$1" ]; then
14 echo "Usage: $0 <filepath> [<md5sum> [<file mode bits> [<file ownership>]]]" 1>&2
15 exit 128
16fi
17
18FILE=$1
19NEW_MD5=${2:-""}
20MODE_BITS=${3:-""}
21OWNERSHIP=${4:-""}
22
23if [ ! -f "$FILE" ]; then
24 echo "# ERROR: File $FILE does not exists" 1>&2
25 exit 1
26fi
27
28# First try to transfer file to local system
29# this restricts the filesize to the maximum size of the /tmp system
30TMPFILE=`mktemp -t $(basename $0)` || exit 1
31cat > $TMPFILE || exit 1
32TMP_MD5="`md5 -q $TMPFILE`" || exit 1
33
34# Check which md5 to use, the given one or the calculated one
35if [ -n "$NEW_MD5" ]; then
36 TARGET_MD5="$NEW_MD5"
37 if [ "$TMP_MD5" != "$TARGET_MD5" ]; then
38 echo "# ERROR: File transfer failed" 1>&2
39 exit 2
40 fi
41else
42 TARGET_MD5="$TMP_MD5"
43fi
44
45# Actually check whether we need to copy the file
46CURRENT_MD5=`md5 -q $FILE` || exit 1
47if [ "$CURRENT_MD5" != "$TARGET_MD5" ]; then
48 echo "# INFO: Updating $FILE; old MD5 $CURRENT_MD5"
49 mount -uwo noatime / || exit 1
50 cp -f $TMPFILE $FILE
51 [ -n "$MODE_BITS" ] && chmod $MODE_BITS $FILE
52 [ -n "$OWNERSHIP" ] && chown $OWNERSHIP $FILE
53 mount -ur /
54
55 # Make sure to recheck the md5 alter write to make sure all went ok
56 RECHECK_MD5=`md5 -q $FILE`
57 echo "# INFO: Updated $FILE; new MD5 $RECHECK_MD5"
58else
59 echo "# INFO: File $FILE already has md5 $CURRENT_MD5"
60fi
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