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unixfs: fix dagTruncate to preserve node type #5216

Merged
merged 3 commits into from
Jul 18, 2018
Merged

unixfs: fix dagTruncate to preserve node type #5216

merged 3 commits into from
Jul 18, 2018

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schomatis
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So, in a weird series of coincidences that I don't fully understand I need to fix this old bug (which I already fixed in the PR #4758 that I never finished) to be able to refactor some parts of the code of the DAG reader (see #5192 (comment)).

I'm selfishly assigning this PR a high priority to get it merged as soon as possible after the upcoming release, as it will simplify my work on the DAG reader.

Fixes #4519.

unixfs: fix `dagTruncate` to preserve node type

Extract the original `FSNode` passed inside the `ipld.Node` argument and modify
its `Blocksizes` (removing all of them and re-adding the ones that were not
truncated). In contrast, the replaced code was creating a new `FSNode` that was
not preserving some of the features of the original one.

mfs: add test case for MFS repeated truncation failure

@schomatis schomatis added kind/bug A bug in existing code (including security flaws) need/review Needs a review P1 High: Likely tackled by core team if no one steps up topic/MFS Topic MFS topic/UnixFS Topic UnixFS labels Jul 11, 2018
@schomatis schomatis self-assigned this Jul 11, 2018
@schomatis schomatis requested a review from Stebalien July 11, 2018 16:00
@schomatis schomatis requested a review from Kubuxu as a code owner July 11, 2018 16:00
@ghost ghost added the status/in-progress In progress label Jul 11, 2018
@schomatis schomatis added this to the Files API Documentation milestone Jul 11, 2018
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schomatis commented Jul 11, 2018 •
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All of the truncation related tests of the shareness are failing as the TRUNC_HASH was probably built with this bug in place, in a similar situation I was explained that previous test hashes can't be changed (#5120 (comment)), so I'm not sure how to proceed here.

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@whyrusleeping WDYT? (This is my most blocking issue at the moment.)

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whyrusleeping approved these changes Jul 18, 2018
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This looks right to me. Good catch!

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On the TRUNC_HASH, I think its fine to change the hash here as this is clearly an erroneous object. We should probably also test that writing to a file, then truncating it back to the previous length results in the same object (unless there are reasons why this shouldnt happen)

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I think its fine to change the hash here as this is clearly an erroneous object.

Great, do you know how was TRUNC_HASH generated?

We should probably also test that writing to a file, then truncating it back to the previous length results in the same object

Yes, will add that.

@schomatis schomatis removed need help need/review Needs a review labels Jul 18, 2018
@schomatis schomatis mentioned this pull request Jul 18, 2018
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unixfs: fix dagTruncate to preserve node type
65a18ed 
Extract the original `FSNode` passed inside the `ipld.Node` argument and modify
its `Blocksizes` (removing all of them and re-adding the ones that were not
truncated). In contrast, the replaced code was creating a new `FSNode` that was
not preserving some of the features of the original one.

Change `TRUNC_HASH` values in `sharness` that were created with the bug to the
correct values.

License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>
@schomatis
mfs: add test case for MFS repeated truncation failure
508af1e 
License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>
@schomatis
unixfs/mod: add test to Truncate to the same size
70d0f13 
License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>
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Fixed TRUNC_HASH values and rebased to the merged PR #5253 fix so TestDagTruncateSameSize won't panic now.

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Tests are passing now (minus Jenkins..) so @whyrusleeping I think this is RFM now.

@schomatis schomatis removed the status/in-progress In progress label Jul 18, 2018
@Stebalien Stebalien added the RFM label Jul 18, 2018
@whyrusleeping whyrusleeping merged commit e8cc529 into ipfs:master Jul 18, 2018
@schomatis schomatis deleted the fix/dag-modifier/preserve-fsnode branch July 18, 2018 17:10
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@whyrusleeping whyrusleeping whyrusleeping approved these changes

@Stebalien Stebalien Awaiting requested review from Stebalien

@Kubuxu Kubuxu Awaiting requested review from Kubuxu

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kind/bug A bug in existing code (including security flaws) P1 High: Likely tackled by core team if no one steps up RFM topic/MFS Topic MFS topic/UnixFS Topic UnixFS
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Truncating an MFS file 175 times makes it unwritable.
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@schomatis @whyrusleeping @Stebalien