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#!/bin/sh
do_usage () {
cat << _EOF
Usage: populate-extfs.sh <source> <device>
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
DEBUGFS="debugfs"
{
CWD="/"
find $SRCDIR | while read FILE; do
TGT="${FILE##*/}"
DIR="${FILE#$SRCDIR}"
# Skip the root dir
[ ! -z "$DIR" ] || continue
[ ! -z "$TGT" ] || continue
DIR="$(dirname "$DIR")"
# debugfs handles the quotation mark differently from other special marks like {
# If FILE contains quotation marks in its name, then we have to replace " with ""
# so that debugfs could correclty recognize them. In this script, we use the prefix
# of D_ to denote the file names that should be used by debugfs.
#
# The usage of case statements here is to avoid performace impact.
case $FILE in
*\"*)
D_FILE="$(echo $FILE | sed -e 's#\"#\"\"#g')"
;;
*)
D_FILE="$FILE"
;;
esac
case $DIR in
*\"*)
D_DIR="$(echo $DIR | sed -e 's#\"#\"\"#g')"
;;
*)
D_DIR="$DIR"
;;
esac
case $TGT in
*\"*)
D_TGT="$(echo $TGT | sed -e 's#\"#\"\"#g')"
;;
*)
D_TGT="$TGT"
;;
esac
if [ "$DIR" != "$CWD" ]; then
echo "cd \"$D_DIR\""
CWD="$DIR"
fi
# Only stat once since stat is a time consuming command
STAT=$(stat -c "TYPE=\"%F\";DEVNO=\"0x%t 0x%T\";MODE=\"%f\";U=\"%u\";G=\"%g\";AT=\"%x\";MT=\"%y\";CT=\"%z\"" "$FILE")
eval $STAT
case $TYPE in
"directory")
echo "mkdir \"$D_TGT\""
;;
"regular file" | "regular empty file")
echo "write \"$D_FILE\" \"$D_TGT\""
;;
"symbolic link")
LINK_TGT=$(readlink "$FILE")
D_LINK_TGT="$(echo $LINK_TGT | sed -e 's#\"#\"\"#g')"
echo "symlink \"$D_TGT\" \"$D_LINK_TGT\""
;;
"block special file")
echo "mknod \"$D_TGT\" b $DEVNO"
;;
"character special file")
echo "mknod \"$D_TGT\" c $DEVNO"
;;
"fifo")
echo "mknod \"$D_TGT\" p"
;;
*)
echo "Unknown/unhandled file type '$TYPE' file: $FILE" 1>&2
;;
esac
# Set the file mode
echo "sif \"$D_TGT\" mode 0x$MODE"
# Set uid and gid
echo "sif \"$D_TGT\" uid $U"
echo "sif \"$D_TGT\" gid $G"
# Set atime, mtime and ctime
AT=`echo $AT | cut -d'.' -f1 | sed -e 's#[- :]##g'`
MT=`echo $MT | cut -d'.' -f1 | sed -e 's#[- :]##g'`
CT=`echo $CT | cut -d'.' -f1 | sed -e 's#[- :]##g'`
echo "sif \"$D_TGT\" atime $AT"
echo "sif \"$D_TGT\" mtime $MT"
echo "sif \"$D_TGT\" ctime $CT"
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)"
D_SRC="$(echo $SRC | sed -e 's#\"#\"\"#g')"
# Remove the files and link them again except the first one
sed -n -e '1!p' $INODE_DIR/$i | while read TGT; do
D_TGT="$(echo $TGT | sed -e 's#\"#\"\"#g')"
echo "rm \"$D_TGT\""
echo "ln \"$D_SRC\" \"$D_TGT\""
done
LN_CNT=`cat $INODE_DIR/$i | wc -l`
# Set the links count
echo "sif \"$D_SRC\" links_count $LN_CNT"
done
rm -fr $INODE_DIR
} | $DEBUGFS -w -f - $DEVICE 2>&1 1>/dev/null | grep '.*: .*'
if [ $? = 0 ]; then
echo "Some error occured while executing [$DEBUGFS -w -f - $DEVICE]"
exit 1
fi
|
