create openwrt qemu image

QEMU - OpenWRT x86_64.md

QEMU - OpenWRT x86_64

    qemu-img create -f qcow2 hda.qcow2 1G
    # expected output
    Formatting 'hda.qcow2', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16

    ll
    # expected output
    -rw-r--r--  1 root root 42281968 Aug 12 02:23 hda.qcow2
    -rw-r--r--  1 root root 42281968 Aug 12 02:19 openwrt-koolshare-mod-v2.19-r8118-26796a2-x86-64-combined-squashfs.img.gz


    gzip -d openwrt-koolshare-mod-v2.19-r8118-26796a2-x86-64-combined-squashfs.img.gz

    ll
    # expected output
    -rw-r--r--  1 root root  42281968 Aug 12 02:23 hda.qcow2
    -rw-r--r--  1 root root 248844387 Aug 12 02:19 openwrt-koolshare-mod-v2.19-r8118-26796a2-x86-64-combined-squashfs.img


    dd if=openwrt-koolshare-mod-v2.19-r8118-26796a2-x86-64-combined-squashfs.img of=hda.qcow2
    # expected output
    486024+1 records in
    486024+1 records out
    248844387 bytes (249 MB, 237 MiB) copied, 1.41203 s, 176 MB/s

    qemu-img info hda.qcow2
    # expected output
    image: hda.qcow2
    file format: raw
    virtual size: 237M (248844800 bytes)
    disk size: 237M

    qemu-img resize hda.qcow2 +750M
    # expected output
    WARNING: Image format was not specified for 'hda.qcow2' and probing guessed raw.
             Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
             Specify the 'raw' format explicitly to remove the restrictions.
    Image resized.