[OpenWrt-Devel] Signing, meta-data, etc. on images and losetup mounts...

[Philip Prindeville]

> On Apr 29, 2020, at 3:06 AM, Petr Štetiar <ynezz at true.cz> wrote:
> 
> Philip Prindeville <philipp_subx at redfish-solutions.com> [2020-04-27 18:17:01]:
> 
>> I was trying to take a openwrt-*-generic-squashfs-combined-efi.img file from master and verify it for correctness with “losetup”, etc.
>> But losetup bailed because the image wasn’t a multiple of 512 bytes long.
> 
> It works for me (tm):
> 
> $ binwalk bin/targets/x86/64/openwrt-x86-64-generic-squashfs-combined-efi.img | grep Squashfs
> 17301504      0x1080000       Squashfs filesystem, little endian, version 4.0, compression:xz, size: 6672270 bytes, 1266 inodes, blocksize: 262144 bytes, created: 2020-04-29 07:43:39
> 
> $ sudo mount -o loop,offset=17301504 bin/targets/x86/64/openwrt-x86-64-generic-squashfs-combined-efi.img tmp
> 
> $ cat tmp/etc/openwrt_version 
> r13122+7-522f6b7eee47
> 
> BTW it's usually faster to verify the correctness with QEMU:
> 
> $ ./scripts/qemustart x86 64 bin/targets/x86/64/openwrt-x86-64-generic-squashfs-combined-efi.img
> 
> — ynezz


Thanks.  Where is the beginning of the whole disk image (and end) if I want to “dd” it onto an SSD or SD?

-Philip



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