Can I get the hash for my data without adding it to IPFS?

Help
1

From @Blackphidora on Tue Feb 14 2017 06:16:49 GMT+0000 (UTC)

more for curiosities sake. But it would be nice to see the hash before making the final write.

Copied from original issue: Can I get the hash for my data without adding it to IPFS? · Issue #227 · ipfs-inactive/faq · GitHub

2

From @RichardLitt on Tue Feb 14 2017 16:10:21 GMT+0000 (UTC)

Do you mean something like ipfs ls <hash>, ipfs get <hash>, or ipfs refs <hash>? All of these work with existing hashes. Or you could check on the gateway.

If you’re curious about getting a hash of your data without adding the content to IPFS, and then checking; I’m not sure if that is possible at the moment. Someone else will know more.

3

From @Blackphidora on Tue Feb 14 2017 16:13:24 GMT+0000 (UTC)

Your second paragraph is what I’m looking for.

4

From @RichardLitt on Tue Feb 14 2017 16:17:18 GMT+0000 (UTC)

Renamed it to be a bit clearer. Let me know if that’s not OK!

5

From @RichardLitt on Tue Feb 14 2017 16:18:05 GMT+0000 (UTC)

It looks like ipfs add <data> -n would work for you. From ipfs add -h:

  -n,     --only-hash           bool   - Only chunk and hash - do not write to disk. Default: false.
6

From @Blackphidora on Tue Feb 14 2017 16:19:02 GMT+0000 (UTC)

badass, Thanks a ton. I havent actually deployed IPFS yet, so I couldnt see the --help :confused:

7

From @RichardLitt on Tue Feb 14 2017 16:21:25 GMT+0000 (UTC)

Just tested. This works as you would expect - I got the hash, but was unable to get it locally or through the gateway.

8

From @VictorBjelkholm on Wed Feb 15 2017 10:31:19 GMT+0000 (UTC)

You can use the -n flag to ipfs add to just chunk and hash the file and
not add it to IPFS.

-n,         --only-hash           bool   - Only chunk and hash - do not
write to disk.

On Tue, Feb 14, 2017 at 5:13 PM, Ryan Walter notifications@github.com
wrote:

Your second paragraph is what I’m looking for.

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9

Is there a library to compute the hash without having to run a IPFS node ?
So far it seems I can maybe use https://github.com/ipld/js-ipld and https://github.com/ipfs/js-ipfs-unixfs-importer
This seems overkill though.
Is there not a simple way to generate hash of a folder of files ?