How to find package with `libcom_err.so.2`?

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1

I’m trying to package something and autoPatchelfHook is complaining:

autoPatchelfHook could not satisfy dependency libcom_err.so.2 wanted by /nix/store/rsrgkb6rkm52fsg6dxb5cdms2l7rrs4b-nsight_systems-2021.5.2.53/nsight-systems/2021.5.2/target-linux-x64/CollectX/RedHat/x86_64/libssl.so.10

But despite my googling, I haven’t been able to track down which package contains this library. How do I located such a file?

It appears that searching for files in search.nixos.org does not work.

2

Ended up finding this in e2fsprogs of all places. Still, I’m confused about how to do this in general? Is there no better solution than rough googling and guess-and-check?

3

The most common approach is probably to use nix-index/nix-locate:

$ nix shell nixpkgs#nix-index -c nix-locate lib/libcom_err.so.2 | grep -v '('
e2fsprogs.out                                         0 s /nix/store/ghnqs6bfidr7g3i0y91kibh6f52i51q5-e2fsprogs-1.46.2/lib/libcom_err.so.2
e2fsprogs.out                                    22,608 x /nix/store/ghnqs6bfidr7g3i0y91kibh6f52i51q5-e2fsprogs-1.46.2/lib/libcom_err.so.2.1

(The grep -v '(' is used to remove a bunch (130) of “indirect” providers)

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4

Does nix-index/nix-locate work on packages that I do not have in my local /nix/store?

5

Yes, that’s its purpose.

You need to build an initial DB using nix-index which will query hydra for path contents and write it to disk. On my machine with my internet connection this took 10 minutes and the file has a size of ~43 MiB.

After that you can use nix-locate to query the database.

I usually rebuild the DB once in a while, roughly after a new release, or whenever I have searched something where I know it has to be there (as I use it already) but nothing was found.

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6

Hmm, I usually make do with just find for those things. I really need a solution for packages that I don’t have in my own personal /nix/store.

7

So use nix-index, it even tells you the attribute name.

8

Oh sorry I totally misread! It’s late here haha…

9

A nix-index data is continuously updated at GitHub - Mic92/nix-index-database: Weekly updated nix-index database. You can follow the description there to just copy the file in place so it works with nix-locate or set it to update automatically.

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