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Message-ID: <1377498124-25842-4-git-send-email-liezhi.yang@windriver.com>
Date: Mon, 26 Aug 2013 14:22:04 +0800
From: Robert Yang <liezhi.yang@...driver.com>
To: <linux-ext4@...r.kernel.org>
CC: <tytso@....edu>, <dvhart@...ux.intel.com>,
<darrick.wong@...cle.com>
Subject: [PATCH 3/3 V4] contrib/populate-extfs.sh: use debugfs to populate extX fs
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 <liezhi.yang@...driver.com>
Acked-by: Darren Hart <dvhart@...ux.intel.com>
---
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 <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=$2
+
+# Find where is the debugfs command if not found in the env.
+if [ -z "$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
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