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106 lines
2.4 KiB
106 lines
2.4 KiB
#!/bin/sh
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#
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# This script uses debugfs command to populate the ext2/3/4 filesystem
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# from a given directory.
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#
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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=$2
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# Find where is the debugfs command if not found in the env.
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if [ -z "$DEBUGFS" ]; then
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CONTRIB_DIR=$(dirname $(readlink -f $0))
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DEBUGFS="$CONTRIB_DIR/../debugfs/debugfs"
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fi
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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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DIR="${DIR%$TGT}"
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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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if [ "$DIR" != "$CWD" ]; then
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echo "cd $DIR"
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CWD="$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\"" $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 $TGT"
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;;
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"regular file" | "regular empty file")
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echo "write $FILE $TGT"
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;;
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"symbolic link")
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LINK_TGT=$(readlink $FILE)
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echo "symlink $TGT $LINK_TGT"
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;;
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"block special file")
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echo "mknod $TGT b $DEVNO"
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;;
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"character special file")
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echo "mknod $TGT c $DEVNO"
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;;
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"fifo")
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echo "mknod $TGT p"
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;;
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*)
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echo "Unknown/unhandled file type '$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 $TGT mode 0x$MODE"
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# Set uid and gid
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echo "sif $TGT uid $U"
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echo "sif $TGT gid $G"
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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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# Remove the files and link them again except the first one
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for TGT in `sed -n -e '1!p' $INODE_DIR/$i`; do
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echo "rm $TGT"
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echo "ln $SRC $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 $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
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