147 lines
3.8 KiB
Bash
147 lines
3.8 KiB
Bash
#!/bin/sh
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do_usage () {
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cat << _EOF
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Usage: populate-extfs.sh <source> <device>
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Create an ext2/ext3/ext4 filesystem from a directory or file
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source: The source directory or file
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device: The target device
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_EOF
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exit 1
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}
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[ $# -ne 2 ] && do_usage
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SRCDIR=${1%%/}
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DEVICE=$2
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DEBUGFS="debugfs"
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{
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CWD="/"
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find $SRCDIR | while read FILE; do
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TGT="${FILE##*/}"
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DIR="${FILE#$SRCDIR}"
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# Skip the root dir
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[ ! -z "$DIR" ] || continue
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[ ! -z "$TGT" ] || continue
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DIR="$(dirname "$DIR")"
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# debugfs handles the quotation mark differently from other special marks like {
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# If FILE contains quotation marks in its name, then we have to replace " with ""
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# so that debugfs could correclty recognize them. In this script, we use the prefix
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# of D_ to denote the file names that should be used by debugfs.
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#
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# The usage of case statements here is to avoid performace impact.
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case $FILE in
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*\"*)
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D_FILE="$(echo $FILE | sed -e 's#\"#\"\"#g')"
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;;
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*)
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D_FILE="$FILE"
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;;
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esac
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case $DIR in
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*\"*)
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D_DIR="$(echo $DIR | sed -e 's#\"#\"\"#g')"
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;;
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*)
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D_DIR="$DIR"
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;;
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esac
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case $TGT in
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*\"*)
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D_TGT="$(echo $TGT | sed -e 's#\"#\"\"#g')"
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;;
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*)
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D_TGT="$TGT"
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;;
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esac
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if [ "$DIR" != "$CWD" ]; then
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echo "cd \"$D_DIR\""
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CWD="$DIR"
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fi
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# Only stat once since stat is a time consuming command
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STAT=$(stat -c "TYPE=\"%F\";DEVNO=\"0x%t 0x%T\";MODE=\"%f\";U=\"%u\";G=\"%g\";AT=\"%x\";MT=\"%y\";CT=\"%z\"" "$FILE")
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eval $STAT
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case $TYPE in
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"directory")
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echo "mkdir \"$D_TGT\""
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;;
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"regular file" | "regular empty file")
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echo "write \"$D_FILE\" \"$D_TGT\""
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;;
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"symbolic link")
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LINK_TGT=$(readlink "$FILE")
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D_LINK_TGT="$(echo $LINK_TGT | sed -e 's#\"#\"\"#g')"
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echo "symlink \"$D_TGT\" \"$D_LINK_TGT\""
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;;
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"block special file")
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echo "mknod \"$D_TGT\" b $DEVNO"
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;;
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"character special file")
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echo "mknod \"$D_TGT\" c $DEVNO"
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;;
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"fifo")
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echo "mknod \"$D_TGT\" p"
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;;
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*)
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echo "Unknown/unhandled file type '$TYPE' file: $FILE" 1>&2
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;;
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esac
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# Set the file mode
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echo "sif \"$D_TGT\" mode 0x$MODE"
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# Set uid and gid
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echo "sif \"$D_TGT\" uid $U"
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echo "sif \"$D_TGT\" gid $G"
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# Set atime, mtime and ctime
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AT=`echo $AT | cut -d'.' -f1 | sed -e 's#[- :]##g'`
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MT=`echo $MT | cut -d'.' -f1 | sed -e 's#[- :]##g'`
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CT=`echo $CT | cut -d'.' -f1 | sed -e 's#[- :]##g'`
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echo "sif \"$D_TGT\" atime $AT"
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echo "sif \"$D_TGT\" mtime $MT"
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echo "sif \"$D_TGT\" ctime $CT"
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done
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# Handle the hard links.
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# Save the hard links to a file, use the inode number as the filename, for example:
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# If a and b's inode number is 6775928, save a and b to /tmp/tmp.VrCwHh5gdt/6775928.
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INODE_DIR=`mktemp -d` || exit 1
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for i in `find $SRCDIR -type f -links +1 -printf 'INODE=%i###FN=%p\n'`; do
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eval `echo $i | sed 's$###$ $'`
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echo ${FN#$SRCDIR} >>$INODE_DIR/$INODE
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done
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# Use the debugfs' ln and "sif links_count" to handle them.
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for i in `ls $INODE_DIR`; do
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# The link source
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SRC="$(head -1 $INODE_DIR/$i)"
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D_SRC="$(echo $SRC | sed -e 's#\"#\"\"#g')"
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# Remove the files and link them again except the first one
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sed -n -e '1!p' $INODE_DIR/$i | while read TGT; do
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D_TGT="$(echo $TGT | sed -e 's#\"#\"\"#g')"
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echo "rm \"$D_TGT\""
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echo "ln \"$D_SRC\" \"$D_TGT\""
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done
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LN_CNT=`cat $INODE_DIR/$i | wc -l`
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# Set the links count
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echo "sif \"$D_SRC\" links_count $LN_CNT"
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done
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rm -fr $INODE_DIR
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} | $DEBUGFS -w -f - $DEVICE 2>&1 1>/dev/null | grep '.*: .*'
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if [ $? = 0 ]; then
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echo "Some error occured while executing [$DEBUGFS -w -f - $DEVICE]"
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exit 1
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fi
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