From: Robert Yang Subject: [PATCH 3/3 V4] contrib/populate-extfs.sh: use debugfs to populate extX fs Date: Mon, 26 Aug 2013 14:22:04 +0800 Message-ID: <1377498124-25842-4-git-send-email-liezhi.yang@windriver.com> References: <1377498124-25842-1-git-send-email-liezhi.yang@windriver.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , To: Return-path: Received: from mail.windriver.com ([147.11.1.11]:59953 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755948Ab3HZG0g (ORCPT ); Mon, 26 Aug 2013 02:26:36 -0400 In-Reply-To: <1377498124-25842-1-git-send-email-liezhi.yang@windriver.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: This script uses debugfs command to populate the ext2/3/4 filesystem from a given directory, it is a little similar to genext2fs, but this one fully supports ext3 and ext4. Signed-off-by: Robert Yang Acked-by: Darren Hart --- contrib/populate-extfs.sh | 105 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 105 insertions(+) create mode 100755 contrib/populate-extfs.sh diff --git a/contrib/populate-extfs.sh b/contrib/populate-extfs.sh new file mode 100755 index 0000000..b1d3d1f --- /dev/null +++ b/contrib/populate-extfs.sh @@ -0,0 +1,105 @@ +#!/bin/sh +# +# This script uses debugfs command to populate the ext2/3/4 filesystem +# from a given directory. +# + +do_usage () { + cat << _EOF +Usage: populate-extfs.sh +Create an ext2/ext3/ext4 filesystem from a directory or file + + source: The source directory or file + device: The target device + +_EOF + exit 1 +} + +[ $# -ne 2 ] && do_usage + +SRCDIR=${1%%/} +DEVICE=$2 + +# Find where is the debugfs command if not found in the env. +if [ -z "$DEBUGFS" ]; then + CONTRIB_DIR=$(dirname $(readlink -f $0)) + DEBUGFS="$CONTRIB_DIR/../debugfs/debugfs" +fi + +{ + CWD="/" + find $SRCDIR | while read FILE; do + TGT="${FILE##*/}" + DIR="${FILE#$SRCDIR}" + DIR="${DIR%$TGT}" + + # Skip the root dir + [ ! -z "$DIR" ] || continue + [ ! -z "$TGT" ] || continue + + if [ "$DIR" != "$CWD" ]; then + echo "cd $DIR" + CWD="$DIR" + fi + + # Only stat once since stat is a time consuming command + STAT=$(stat -c "TYPE=\"%F\";DEVNO=\"0x%t 0x%T\";MODE=\"%f\";U=\"%u\";G=\"%g\"" $FILE) + eval $STAT + + case $TYPE in + "directory") + echo "mkdir $TGT" + ;; + "regular file" | "regular empty file") + echo "write $FILE $TGT" + ;; + "symbolic link") + LINK_TGT=$(readlink $FILE) + echo "symlink $TGT $LINK_TGT" + ;; + "block special file") + echo "mknod $TGT b $DEVNO" + ;; + "character special file") + echo "mknod $TGT c $DEVNO" + ;; + "fifo") + echo "mknod $TGT p" + ;; + *) + echo "Unknown/unhandled file type '$TYPE' file: $FILE" 1>&2 + ;; + esac + + # Set the file mode + echo "sif $TGT mode 0x$MODE" + + # Set uid and gid + echo "sif $TGT uid $U" + echo "sif $TGT gid $G" + done + + # Handle the hard links. + # Save the hard links to a file, use the inode number as the filename, for example: + # If a and b's inode number is 6775928, save a and b to /tmp/tmp.VrCwHh5gdt/6775928. + INODE_DIR=`mktemp -d` || exit 1 + for i in `find $SRCDIR -type f -links +1 -printf 'INODE=%i###FN=%p\n'`; do + eval `echo $i | sed 's$###$ $'` + echo ${FN#$SRCDIR} >>$INODE_DIR/$INODE + done + # Use the debugfs' ln and "sif links_count" to handle them. + for i in `ls $INODE_DIR`; do + # The link source + SRC=`head -1 $INODE_DIR/$i` + # Remove the files and link them again except the first one + for TGT in `sed -n -e '1!p' $INODE_DIR/$i`; do + echo "rm $TGT" + echo "ln $SRC $TGT" + done + LN_CNT=`cat $INODE_DIR/$i | wc -l` + # Set the links count + echo "sif $SRC links_count $LN_CNT" + done + rm -fr $INODE_DIR +} | $DEBUGFS -w -f - $DEVICE -- 1.8.1.2