Latest core22 snap breaks snapcraft

[jonathan-conder]

For some reason my system picked up the beta/candidate version of core22 recently:

$ snap info core22
name:      core22
summary:   Snap runtime environment
publisher: Canonical✓
store-url: https://snapcraft.io/core22
license:   unset
description: |
  Base snaps are a specific type of snap that include libraries and dependencies common to many
  applications. They provide a consistent and reliable execution environment for the snap packages
  that use them.
  
  The core22 base snap provides a runtime environment based on Ubuntu 22.04 LTS (Jammy Jellyfish).
  
  Other Ubuntu environment base snaps include:
  -   Core 18: <https://snapcraft.io/core18>
  -   Core 20: <https://snapcraft.io/core20>
  -   Core 24: <https://snapcraft.io/core24>
  
  **Using a base snap**
  
  Base snaps are installed automatically when a snap package requires them. Only one of each type of
  base snap is ever installed.
  
  Manually removing a base snap may affect the stability of your system.
  
  **Building snaps with core22**
  
  Snap developers can use this base in their own snaps by adding the following to the snap's
  snapcraft.yaml:
  
      base: core22
  
  **Additional Information***
  
  For more details, and guidance on using base snaps, see our documentation:
  <https://snapcraft.io/docs/base-snaps>
type:         base
snap-id:      amcUKQILKXHHTlmSa7NMdnXSx02dNeeT
tracking:     latest/stable
refresh-date: today at 17:14 NZDT
channels:
  latest/stable:          20241001 2024-10-26 (1663) 77MB -
  latest/candidate:       20241029 2024-11-13 (1690) 76MB -
  latest/beta:            20241029 2024-10-29 (1690) 76MB -
  latest/edge:            20241114 2024-11-14 (1713) 76MB -
  fips-updates/stable:    20231019 2023-11-03  (952) 78MB -
  fips-updates/candidate: ↑                               
  fips-updates/beta:      ↑                               
  fips-updates/edge:      ↑                               
  fips-preview/stable:    20231019 2023-11-03  (952) 78MB -
  fips-preview/candidate: ↑                               
  fips-preview/beta:      ↑                               
  fips-preview/edge:      ↑                               
  fips/stable:            –                               
  fips/candidate:         –                               
  fips/beta:              –                               
  fips/edge:              20231019 2023-11-03  (952) 78MB -
installed:                20241029            (1690) 76MB base

Due to this I am no longer able to install snapcraft:

$ sudo snap install --classic snapcraft
error: cannot perform the following tasks:
- Run configure hook of "snapcraft" snap if present (run hook "configure": 
-----
Traceback (most recent call last):
  File "/snap/snapcraft/12961/snap/hooks/configure", line 7, in <module>
    from snapcraft.snap_config import SnapConfig
  File "/snap/snapcraft/current/lib/python3.10/site-packages/snapcraft/__init__.py", line 23, in <module>
    import snapcraft.sources  # noqa: F401
  File "/snap/snapcraft/current/lib/python3.10/site-packages/snapcraft/sources.py", line 22, in <module>
    from snapcraft_legacy.sources import get
  File "/snap/snapcraft/current/lib/python3.10/site-packages/snapcraft_legacy/__init__.py", line 340, in <module>
    from snapcraft_legacy.internal import repo  # noqa
  File "/snap/snapcraft/current/lib/python3.10/site-packages/snapcraft_legacy/internal/repo/__init__.py", line 27, in <module>
    from ._deb import Ubuntu  # noqa
  File "/snap/snapcraft/current/lib/python3.10/site-packages/snapcraft_legacy/internal/repo/_deb.py", line 39, in <module>
    from .apt_cache import AptCache
  File "/snap/snapcraft/current/lib/python3.10/site-packages/snapcraft_legacy/internal/repo/apt_cache.py", line 25, in <module>
    import apt
  File "/snap/snapcraft/current/lib/python3.10/site-packages/apt/__init__.py", line 23, in <module>
    import apt_pkg
ImportError: /snap/core22/current/lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.38' not found (required by /lib/x86_64-linux-gnu/libapt-pkg.so.6.0)
-----)

A workaround is to run:

$ sudo snap refresh core22 --revision 1663

One difference between the revisions is that 1690 is missing /snap/core22/current/lib/x86_64-linux-gnu/libapt-pkg.so.6.0. If I had to guess, c58d089 looks like it might be the cause.

Reproduction steps:

1. Install Ubuntu Server 24.04.1 with default settings.
2. Run these commands:

$ sudo apt update
$ sudo apt full-upgrade
$ sudo reboot
$ sudo snap install core22 --candidate
$ sudo snap install snapcraft --classic

[Meulengracht]

Hey!

Thank you for reporting this, we'll get the release blocked until we just understand why removing the correct version breaks snapcraft.

[alfonsosanchezbeato]

FWIW, the reason for #254 was a fix to as libapt was not meant to be shipped by core, and the wrong version was being deleted (libapt-pkg5.0 vs libapt-pkg6.0).