`snapcraft lint` produces spurious warnings on core26 projects

[astrojuanlu]

Check existing issues

• I've verified that this bug isn't described by any existing issues.

Bug description

I've observed that snapcraft lint gives errors and warnings that aren't shown during snapcraft pack. In my case:

...
/bin/bash: symbol lookup error: /snap/core26/current/lib/x86_64-linux-gnu/libc.so.6: undefined symbol: __tunable_is_initialized, version GLIBC_PRIVATE
/bin/bash: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.42' not found (required by /snap/core26/current/lib/x86_64-linux-gnu/libtinfo.so.6)
/bin/bash: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.38' not found (required by /snap/core26/current/lib/x86_64-linux-gnu/libtinfo.so.6)
/bin/bash: symbol lookup error: /snap/core26/current/lib/x86_64-linux-gnu/libc.so.6: undefined symbol: __tunable_is_initialized, version GLIBC_PRIVATE
/bin/bash: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.42' not found (required by /snap/core26/current/lib/x86_64-linux-gnu/libtinfo.so.6)
/bin/bash: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.38' not found (required by /snap/core26/current/lib/x86_64-linux-gnu/libtinfo.so.6)
/bin/bash: symbol lookup error: /snap/core26/current/lib/x86_64-linux-gnu/libc.so.6: undefined symbol: __tunable_is_initialized, version GLIBC_PRIVATE
/bin/bash: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.42' not found (required by /snap/core26/current/lib/x86_64-linux-gnu/libtinfo.so.6)
/bin/bash: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.38' not found (required by /snap/core26/current/lib/x86_64-linux-gnu/libtinfo.so.6)

Lint warnings:
- library: libcurl.so.4: unused library 'usr/lib/x86_64-linux-gnu/libcurl.so.4.8.0'. (https://documentation.ubuntu.com/snapcraft/stable/how-to/debugging/use-the-library-linter)
- library: libevent_core-2.1.so.7: unused library 'usr/lib/x86_64-linux-gnu/libevent_core-2.1.so.7.0.1'. (https://documentation.ubuntu.com/snapcraft/stable/how-to/debugging/use-the-library-linter)
- library: libfido2.so.1: unused library 'usr/lib/x86_64-linux-gnu/libfido2.so.1.16.0'. (https://documentation.ubuntu.com/snapcraft/stable/how-to/debugging/use-the-library-linter)
- library: libicuio.so.78: unused library 'usr/lib/x86_64-linux-gnu/libicuio.so.78.2'. (https://documentation.ubuntu.com/snapcraft/stable/how-to/debugging/use-the-library-linter)
- library: libicutest.so.78: unused library 'usr/lib/x86_64-linux-gnu/libicutest.so.78.2'. (https://documentation.ubuntu.com/snapcraft/stable/how-to/debugging/use-the-library-linter)
...

Apparently this is because core22 is hardcoded:

snapcraft/snapcraft/commands/lint.py

Line 164 in 429f628

build_base = providers.SNAPCRAFT_BASE_TO_PROVIDER_BASE["core22"]

So snapcraft lint will always use it, regardless of the base of the .snap being linted.

I tried to "run snapcraft lint on destructive mode" but I don't see the corresponding flag.

Steps to reproduce

• Run snapcraft pack for a core26 snap, for example [DPE-10579] Build MySQL 9.7 as snap mysql-snap#34. Lint is executed as part of the pack, and no warnings are given about missing libraries.
• Run snapcraft lint for that same snap. Chances are lots of warnings on unused libraries are raised, plus other warnings and errors.

Environment

I'm running Snapcraft 9.0.1 inside a Multipass VM with Ubuntu 24.04 while packing a core26 snap.

snapcraft.yaml

Log output