add --verify flag to dump command

[27149chen]

Output of restic version

restic 0.16.2 (v0.16.2-63-gb72de5a88) compiled with go1.21.0 on linux/amd64

What should restic do differently? Which functionality do you think we should add?

add --verify flag to dump command just like restore

What are you trying to do? What problem would this solve?

I want to restore a block device and verify it after restore

Did restic help you today? Did it make you happy in any way?

we built a wonderful solution on top of Resic, it really help

[MichaelEischer]

Such an option could only work when using the --target option for the dump command. It is impossible to add when the output is written to stdout.

I don't think such an option is particularly useful. dump already verifies each blob before writing it to the target file.

[27149chen]

@MichaelEischer --verify can also be used to verify the content in the tarball. If you dump the whole snapshot as a tarball, it is similiar with the --verify in restore command

[MichaelEischer]

I'm still not really sure how useful a --verify option would be for the dump command. But I'd be ok if someone implements such an option, as long as it doesn't lead to too much code duplication (maybe some parts of the verify functionality in the restore command can be reused).