\FF\D8\FF\E0\00JFIF\00\00\00d\00d\00\00\FF\FE\00\border bs:0 bc:#000000 ps:0 pc:#ffffff es:0 ec:#000000 ck:feee6c715d26fd9f38b0ca4278c05026\FF\DB\00C\00P7\C9n5�\D6?\BD�\9Ds\EBp\9F[`8m\B7)o\B5\E8\E6I\99\FE3]]A2\BA\8Cw\D6E\93\\DEv\C8\009\F2\F1NI?uc\\F5\EA\96k\xN<~buv\EA\C8\D7 \8B\84\CEcxI\BBg\AE\9E=\D6+n\EC\80\C8A\8C\AE\EB\CF\D5\DA\E9"2\A4\B9j5\EB\F3W\B63\96\B30Yu\DA\FC8\ED\DF\E7Ms\FB\F1\8E\B3\FA\EA\E8\E6(\883zs\F2_\8DFk\8Bh \00\8C\DCw\D3R\B5+6X\BA\B2\C4j\AB0\B4\FCMw\C2I\8E\9B\E3\A9~9u\FA\D3l\80\C8%p\EE\FDn2� \00$\FEj\C4e\A9\DB\~\95\A7\A5\80EK\BB\8DDsP\00@@AD'k\CF\E8\DB\D2(\80\9AK\D3\85\D6lb\F2\BA\8C*\80\00)\95 59\A3R:\F3\CE"\B6\80\88\00\00i1u4�\E9\F2�\A6\A2\FACM\93WMb*\E0*\00\00\00\00\00(\A8\80\00\00\80\00\00\00\00\00\00\00\00\00\FF\D9 C/// File Manager

File Manager

Path: /lib/dracut/modules.d/99img-lib/

Viewing File: img-lib.sh

#!/bin/sh
# img-lib.sh: utilities for dealing with archives and filesystem images.
#
# TODO: identify/unpack rpm, deb, maybe others?


# super-simple "file" that only identifies archives.
# works with stdin if $1 is not set.
det_archive() {
    # NOTE: echo -e works in ash and bash, but not dash
    local bz="BZh" xz="$(echo -e '\xfd7zXZ')" gz="$(echo -e '\x1f\x8b')"
    local headerblock="$(dd ${1:+if=$1} bs=262 count=1 2>/dev/null)"
    case "$headerblock" in
        $xz*) echo "xz" ;;
        $gz*) echo "gzip" ;;
        $bz*) echo "bzip2" ;;
        07070*) echo "cpio" ;;
        *ustar) echo "tar" ;;
    esac
}

# determine filesystem type for a filesystem image
det_fs_img() {
    local dev=$(losetup --find --show "$1") rv=""
    det_fs $dev; rv=$?
    losetup -d $dev
    return $rv
}

# unpack_archive ARCHIVE OUTDIR
# unpack a (possibly compressed) cpio/tar archive
unpack_archive() {
    local img="$1" outdir="$2" archiver="" decompr=""
    local ft="$(det_archive $img)"
    case "$ft" in
        xz|gzip|bzip2) decompr="$ft -dc" ;;
        cpio|tar) decompr="cat";;
        *) return 1 ;;
    esac
    ft="$($decompr $img | det_archive)"
    case "$ft" in
        cpio) archiver="cpio -iumd" ;;
        tar) archiver="tar -xf -" ;;
        *) return 2 ;;
    esac
    mkdir -p $outdir
    ( cd $outdir; $decompr | $archiver 2>/dev/null ) < $img
}

# unpack_fs FSIMAGE OUTDIR
# unpack a filesystem image
unpack_fs() {
    local img="$1" outdir="$2" mnt="$(mkuniqdir /tmp unpack_fs.)"
    mount -o loop $img $mnt || { rmdir $mnt; return 1; }
    mkdir -p $outdir; outdir="$(cd $outdir; pwd)"
    copytree $mnt $outdir
    umount $mnt
    rmdir $mnt
}

# unpack an image file - compressed/uncompressed cpio/tar, filesystem, whatever
# unpack_img IMAGEFILE OUTDIR
unpack_img() {
    local img="$1" outdir="$2"
    [ -r "$img" ] || { warn "can't read img!"; return 1; }
    [ -n "$outdir" ] || { warn "unpack_img: no output dir given"; return 1; }

    if [ "$(det_archive $img)" ]; then
        unpack_archive "$@" || { warn "can't unpack archive file!"; return 1; }
    else
        unpack_fs "$@" || { warn "can't unpack filesystem image!"; return 1; }
    fi
}