apt-cache show fails on package that does exist (libtk8.6)

[bruno-digitbio]

Package validation is currently done by using apt-cache show ${package}. However, on the latest version of the GitHub actions runner for Ubuntu, some packages (e.g., libtk8.6) are not visible to apt-cache until after an apt-get update.

This means that cache-apt-pkgs-action errors our during validation even though the package would successfully install after an apt-fast update.

Minimal reproducible example:

jobs:
  example-broken-job:
    name: example-broken-job
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          # Fetch the current and previous commits.
          fetch-depth: 2
          submodules: 'recursive'
      - name: Install apt dependencies for Bazel bootstrapping
        uses: awalsh128/cache-apt-pkgs-action@v1
        with:
          packages: libtk8.6
          version: 1.0

To reproduce the issue directly in a runner:

$ docker attach $(docker run --name github-actions-ubuntu-2 -d -i -t catthehacker/ubuntu:act-latest /bin/bash)
root@e6d223c9b85a:/tmp# apt-cache show libtk8.6
N: Unable to locate package libtk8.6
N: Couldn't find any package by glob 'libtk8.6'
N: Couldn't find any package by regex 'libtk8.6'
E: No packages found
root@e6d223c9b85a:/tmp# apt-get install libtk8.6
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package libtk8.6
E: Couldn't find any package by glob 'libtk8.6'
E: Couldn't find any package by regex 'libtk8.6'
root@e6d223c9b85a:/tmp# apt-get update
<SNIP>
root@e6d223c9b85a:/tmp# apt-cache show libtk8.6
Package: libtk8.6
Architecture: amd64
Version: 8.6.12-1build1
Multi-Arch: same
Priority: optional
Section: libs
Source: tk8.6
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Debian Tcl/Tk Packagers <pkg-tcltk-devel@lists.alioth.debian.org>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 2367
Provides: libtk
Depends: libtcl8.6 (>= 8.6.0-2), libc6 (>= 2.35), libfontconfig1 (>= 2.12.6), libx11-6, libxft2 (>> 2.1.1), libxss1
Suggests: tk8.6
Conflicts: libtk-img (<< 1.2.5), tk40 (<= 4.0p3-2), tk8.6 (<< 8.6.0-2)
Replaces: tk8.6 (<< 8.6.0-2)
Filename: pool/main/t/tk8.6/libtk8.6_8.6.12-1build1_amd64.deb
Size: 783834
MD5sum: 0b77eaf674cddbcf4be3ae5daf33a5da
SHA1: e915a51f975e2c9f9f06105500dd346f939edc73
SHA256: fd394fe34bce405d66079518f122917e434dc269315ed4125dc982d31a03684d
SHA512: ab375b502a641ee170f940fd8775aa0fc1033f5c499886bcc8d9fb06b3bf5da2cd53cc8de6b96abec898215b8de70ec741c2bfad3ae9af4a94d4647988efc064
Homepage: http://www.tcl.tk/
Description: Tk toolkit for Tcl and X11 v8.6 - run-time files
Description-md5: 01d90661559e5ce16fbf055f91aff291
Task: ubuntustudio-desktop

[bruno-digitbio]

Happy to help with a PR if there is an approach to solving this that you like but don't have bandwidth to implement.

[awalsh128]

Thanks for you patience. I haven't had a lot of time lately to look into issues.

Created a regression test in awalsh128/cache-apt-pkgs-action-ci@9730b39 but I am having trouble recreating the issue.

• Install: https://github.com/awalsh128/cache-apt-pkgs-action-ci/actions/runs/6697589110/job/18197795526
• Restore: https://github.com/awalsh128/cache-apt-pkgs-action-ci/actions/runs/6697589110/job/18197804869

Can you take a look at my setup and see if I am missing something? If we can confirm the scenario as being an Apt update issue, we could possibly do a fallback where if apt-cache show fails, we perform an update. It was taken out awhile ago to speed up the restore process.

[awalsh128]

This should be okay now since the Golang version (has regression coverage too). Going to close out. Feel free to re-open if you still have issues.