Added "whole partition" snapshot resync type.

[live-boot-grml.git] / bin / live-snapshot

diff --git a/bin/live-snapshot b/bin/live-snapshot
index bf0e332..d70ef36 100755 (executable)
--- a/bin/live-snapshot
+++ b/bin/live-snapshot
@@ -59,6 +59,7 @@ TMP_FILELIST="${PROGRAM}.list"
 # Command line defaults and declarations
 SNAP_COW="${DEF_SNAP_COW}"
 SNAP_DEV=""
+SNAP_MNT=""
 SNAP_OUTPUT=""
 SNAP_RESYNC_STRING=""
 SNAP_TYPE="cpio"
@@ -99,7 +100,7 @@ Help ()
        echo "  -o, --output: output image file (default: ${DEST})."
        echo "  -r, --resync-string: internally used to resync previous made snapshots."
        echo "  -f, --refresh: try to sync a running snapshot."
-       echo "  -t, --type: snapshot filesystem type. Options: \"squashfs\", \"ext2\", \"ext3\", \"jffs2\" or \"cpio\".gz archive (default: ${SNAP_TYPE})"
+       echo "  -t, --type: snapshot filesystem type. Options: \"squashfs\", \"ext2\", \"ext3\", \"ext4\", \"jffs2\" or \"cpio\".gz archive (default: ${SNAP_TYPE})"
        echo
        echo "Look at live-snapshot(1) man page for more information."
 
@@ -239,9 +240,10 @@ Defaults ()
        then
                SNAP_COW=$(echo "${SNAP_RESYNC_STRING}" | cut -f1 -d ':')
                SNAP_DEV=$(echo "${SNAP_RESYNC_STRING}" | cut -f2 -d ':')
-               DEST="${MOUNTP}/$(echo ${SNAP_RESYNC_STRING} | cut -f3 -d ':')"
+               SNAP_MNT=$(echo "${SNAP_RESYNC_STRING}" | cut -f3 -d ':')
+               DEST="${MOUNTP}/${SNAP_MNT}"
 
-               case "${DEST}" in
+               case "${SNAP_MNT}" in
                        *.cpio.gz)
                                SNAP_TYPE="cpio"
                                ;;
@@ -254,9 +256,18 @@ Defaults ()
                                SNAP_TYPE="jffs2"
                                ;;
 
-                       ""|*.ext2|*.ext3)
+                       *.ext2|*.ext3)
                                SNAP_TYPE="ext2"
                                ;;
+
+                       "")
+                               SNAP_TYPE="whole_partition"
+                               ;;
+
+                       *.ext4)
+                               SNAP_TYPE="ext4"
+                               ;;
+
                        *)
                                Error "unrecognized resync string"
                                ;;
@@ -276,6 +287,10 @@ Defaults ()
                        ext3)
                                DEST="${MOUNTP}/live-sn.ext2"
                                ;;
+
+                       ext4)
+                               DEST="${MOUNTP}/live-sn.ext4"
+                               ;;
                esac
        else
                DEST="${SNAP_OUTPUT}"
@@ -285,7 +300,7 @@ Defaults ()
 Validate_input ()
 {
        case "${SNAP_TYPE}" in
-               cpio|squashfs|jffs2|ext2|ext3)
+               cpio|squashfs|jffs2|ext2|ext3|ext4|whole_partition)
                        ;;
 
                *)
@@ -346,8 +361,8 @@ Do_filelist ()
        TMP_FILELIST=$1
        if [ -f "${SNAP_LIST}" ]
        then
-               # Generate include list
-               for entry in $(cat "${SNAP_LIST}" | grep -v '^#.*$' | grep -v '^ *$')
+               # Generate include list removing empty and commented lines
+               for entry in $(sed -e '/^ *$/d' -e '/^#.*$/d' "${SNAP_LIST}")
                do
                        if [ -d "${entry}" ]
                        then
@@ -397,30 +412,44 @@ Do_snapshot ()
                        if [ -e "${EXCLUDE_LIST}" ]
                        then
                                # Add explicitly excluded files
-                               cat "${EXCLUDE_LIST}" | grep -v '^#.*$' | grep -v '^ *$' >> "${TMP_FILELIST}"
+                               grep -v '^#.*$' "${EXCLUDE_LIST}" | grep -v '^ *$' >> "${TMP_FILELIST}"
                        fi
 
                        cd "${OLDPWD}"
                        mksquashfs "${SNAP_COW}" "${DEST}" -ef "${TMP_FILELIST}"
                        ;;
 
-               cpio)
+               cpio|whole_partition)
+                       if [ "${SNAP_TYPE}" = "cpio" ]
+                       then
+                               COPY_CMD="cpio --quiet -o0 -H newc | gzip -9c > ${DEST}"
+                       else
+                               COPY_CMD="cpio --quiet -pumd0 ${DEST}/"
+                       fi
+
                        WORKING_DIR=$(Do_filelist "${TMP_FILELIST}")
                        cd "${WORKING_DIR}"
                        if [ -e "${EXCLUDE_LIST}" ]
                        then
                                # Convert \0 to \n and tag existing (rare but possible) \n in filenames,
                                # this to let grep -F -v do a proper work in filtering out
-                               cat "${TMP_FILELIST}" | tr '\n' '\1' | tr '\0' '\n' | grep -F -v -f "${EXCLUDE_LIST}" | tr '\n' '\0' | tr '\1' '\n' | cpio --quiet -o0 -H newc | gzip -9c > "${DEST}" || exit 1
+                               cat "${TMP_FILELIST}" | \
+                                       tr '\n' '\1' | \
+                                       tr '\0' '\n' | \
+                                       grep -F -v -f "${EXCLUDE_LIST}" | \
+                                       tr '\n' '\0' | \
+                                       tr '\1' '\n' | \
+                                       $COPY_CMD || exit 1
                        else
-                               cat "${TMP_FILELIST}" | cpio --quiet -o0 -H newc | gzip -9c > "${DEST}" || exit 1
+                               cat "${TMP_FILELIST}" | \
+                                       $COPY_CMD || exit 1
                        fi
                        cd "${OLDPWD}"
                        ;;
 
-               # ext2|ext3 and jffs2 does not easily support an exclude list; files
+               # ext2|ext3|ext4 and jffs2 does not easily support an exclude list; files
                # should be copied to another directory in order to filter content
-               ext2|ext3)
+               ext2|ext3|ext4)
                        DU_DIM="$(du -ks ${SNAP_COW} | cut -f1)"
                        REAL_DIM="$(expr ${DU_DIM} + ${DU_DIM} / 20)" # Just 5% more to be sure, need something more sophistcated here...
                        genext2fs --size-in-blocks=${REAL_DIM} --reserved-percentage=0 --root="${SNAP_COW}" "${DEST}"
@@ -453,7 +482,7 @@ Warn_user ()
        if [ -z "${SNAP_RESYNC_STRING}" ]
        then
                case ${SNAP_TYPE} in
-                       cpio|ext2|ext3)
+                       cpio|ext2|ext3|ext4)
                                echo "Please move ${DEST} (if is not already in it)" > /dev/null 1>&2
                                echo "in a supported writable partition (e.g ext3, vfat)." > /dev/null 1>&2
                                ;;