chore(deps): Downgrade 7zip to v16.02 in nix packaging #1167
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qkaiser
reviewed
Apr 13, 2025
Found some problems with 7z based extractions using the nix environment
which does not happen in debian. The reason is that debian still using a
quite old stable version of the 7z, while a newer one is coming from
nixpkgs.
This commit downgrades 7zip version used by unblob's nix packaging to the same
version (applying the same patches) as debian does, hopefully making the
extractors more stable using nix-based environment.
7zip maintainers changed the behavior or MBR extraction between version
16.02 and 17.05:
- on 16.02, 7z creates a file per MBR partition in the extraction
directory, regardless of the amount of partitions. So we get these
files named ("0.img", "1.img") after their partition entry ID.
- on 17.05, 7z will automagically extract the partition itself if there
is a single partition within the MBR and that partition is a supported
filesystem format (e.g. extfs). So instead of having a "0.img" file,
you immediately get the content of that partition written to disk.
Since one of the main objective of unblob is to identify known/unknown
chunks and provide detailed meta-data about them, we consider important
to have that intermediate step provided by 16.02. This way we know the
MRB contains a partition of a specific type, which itself was handled by
a dedicated unblob handler.
This behavior is kind of invisible on unblob-core since the MBR handler
is only available on the ONEKEY platform right now.
7z 17.05 also has issues when extracting ZIP files, where it does not
accept full path for the "-o" option. For example, "-o/tmp/lol" won't
work, but "cd /tmp/lol; 7z x -p -y sample.zip -o." will. On top of that,
7z seems to set arbitrary permissions on the output directory.
qkaiser
approved these changes
Apr 14, 2025
Investigated and edited the commit message: |
|
Also worth mentioning that Debian and RHEL are both sticking to 16.02 as of now. |
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