Unexpected bash readable test result with GitHub Actions - linux

Question

MWE
I have a GitHub Actions workflow that recently stopped working without me making changes. The error:
==> ERROR: /etc/makepkg.conf not found.
Aborting...
This is from running # sudo -Eu builder makepkg --printsrcinfo.
Source
Logs
The order of the logs seem to be wrong but it is correct in an earlier log (possibly due to ls -l having a large output).
The source of this error seems to be libmakepkg/util/config.sh.in:
# Source the config file; fail if it is not found
if [[ -r $MAKEPKG_CONF ]]; then
source_safe "$MAKEPKG_CONF"
else
error "$(gettext "%s not found.")" "$MAKEPKG_CONF"
plainerr "$(gettext "Aborting...")"
exit $E_CONFIG_ERROR
fi
I added the following to my entrypoint script:
echo "Writing SRCINFO..."
# Debug
echo "---"
ls -l /
echo "---"
ls -l /etc
echo "---"
sudo -Eu builder cat /etc/makepkg.conf
echo "---"
sudo -Eu builder /bin/bash -c "[[ -r "/etc/makepkg.conf" ]] && echo 1 || echo 0"
echo "---"
sudo -Eu builder makepkg --printsrcinfo > .SRCINFO
The builder user is created in build.sh:
useradd builder -m
echo "builder ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
I got:
Setting permissions...
Writing SRCINFO...
---
total 52
lrwxrwxrwx 1 root root 7 Feb 1 19:19 bin -> usr/bin
drwxr-xr-x 2 root root 4096 Jan 19 01:32 boot
drwxr-xr-x 5 root root 340 Feb 7 11:58 dev
-rwxr-xr-x 1 root root 836 Feb 7 11:57 entrypoint.sh
drwxr-xr-x 1 root root 4096 Feb 7 11:58 etc
drwxr-xr-x 6 root root 4096 Feb 7 11:58 github
drwxr-xr-x 1 root root 4096 Feb 7 11:57 home
lrwxrwxrwx 1 root root 7 Feb 1 19:19 lib -> usr/lib
lrwxrwxrwx 1 root root 7 Feb 1 19:19 lib64 -> usr/lib
drwxr-xr-x 2 root root 4096 Jan 19 01:32 mnt
drwxr-xr-x 2 root root 4096 Jan 19 01:32 opt
dr-xr-xr-x 159 root root 0 Feb 7 11:58 proc
drwxr-x--- 2 root root 4096 Jan 19 01:32 root
drwxr-xr-x 1 root root 4096 Feb 7 11:58 run
lrwxrwxrwx 1 root root 7 Feb 1 19:19 sbin -> usr/bin
drwxr-xr-x 4 root root 4096 Feb 1 19:19 srv
dr-xr-xr-x 12 root root 0 Feb 7 11:58 sys
drwxrwxrwt 2 root root 4096 Jan 19 01:32 tmp
drwxr-xr-x 1 root root 4096 Feb 7 11:57 usr
drwxr-xr-x 1 root root 4096 Feb 1 19:19 var
---
total 640
-rw-r--r-- 1 root root 0 Jan 19 01:32 arch-release
drwxr-xr-x 3 root root 4096 Feb 1 19:19 audit
-rw-r--r-- 1 root root 28 Dec 20 18:44 bash.bash_logout
-rw-r--r-- 1 root root 618 Dec 20 18:44 bash.bashrc
-rw-r--r-- 1 root root 447 Dec 2 16:02 bindresvport.blacklist
drwxr-xr-x 2 root root 4096 Dec 16 14:38 binfmt.d
drwxr-xr-x 4 root root 4096 Feb 1 19:19 ca-certificates
-rw------- 1 root root 722 Jan 19 01:32 crypttab
drwxr-xr-x 2 root root 4096 Feb 1 19:19 default
drwxr-xr-x 2 root root 4096 Jan 7 19:51 depmod.d
-rw-r--r-- 1 root root 685 Jan 31 20:31 e2scrub.conf
-rw-r--r-- 1 root root 97 Jan 13 22:50 environment
-rw-r--r-- 1 root root 1362 Jan 20 21:31 ethertypes
-rw-r--r-- 1 root root 126 Jan 19 01:32 fstab
-rw-r--r-- 1 root root 2584 Feb 6 00:09 gai.conf
-rw-r--r-- 1 root root 626 Feb 7 11:57 group
-rw-r--r-- 1 root root 610 Jan 31 00:20 group-
-rw------- 1 root root 558 Feb 7 11:57 gshadow
-rw------- 1 root root 546 Jan 31 00:20 gshadow-
-rw-r--r-- 1 root root 73 Jan 19 01:32 host.conf
-rw-r--r-- 1 root root 13 Feb 7 11:58 hostname
-rw-r--r-- 1 root root 174 Feb 7 11:58 hosts
-rw-r--r-- 1 root root 714 Dec 8 17:48 inputrc
drwxr-xr-x 2 root root 4096 Feb 1 19:19 iproute2
drwxr-xr-x 2 root root 4096 Feb 1 19:19 iptables
-rw-r--r-- 1 root root 20 Jan 19 01:32 issue
drwxr-xr-x 3 root root 4096 Feb 1 19:19 kernel
drwxr-xr-x 2 root root 4096 Jul 7 2020 keyutils
-rw-r--r-- 1 root root 369 Jan 14 00:32 krb5.conf
-rw-r--r-- 1 root root 18096 Feb 7 11:57 ld.so.cache
-rw-r--r-- 1 root root 117 Jan 19 01:32 ld.so.conf
drwxr-xr-x 1 root root 4096 Feb 7 11:57 ld.so.conf.d
-rw-r----- 1 root root 191 Jan 13 22:33 libaudit.conf
drwxr-xr-x 2 root root 4096 Feb 1 19:19 libnl
-rw-r--r-- 1 root root 17 Jan 31 00:19 locale.conf
-rw-r--r-- 1 root root 18 Jan 31 00:19 locale.gen
-rw-r--r-- 1 root root 9984 Feb 6 00:09 locale.gen.pacnew
-rw-r--r-- 1 root root 5645 Sep 7 13:42 login.defs
-rw-r--r-- 1 root root 5792 Jul 1 2020 makepkg.conf
-rw-r--r-- 1 root root 812 Jan 31 20:31 mke2fs.conf
drwxr-xr-x 2 root root 4096 Jan 7 19:51 modprobe.d
drwxr-xr-x 2 root root 4096 Dec 16 14:38 modules-load.d
-rw-r--r-- 1 root root 0 Jan 19 01:32 motd
lrwxrwxrwx 1 root root 12 Feb 7 11:58 mtab -> /proc/mounts
-rw-r--r-- 1 root root 767 Dec 2 16:02 netconfig
-rw-r--r-- 1 root root 2717 Feb 6 00:09 nscd.conf
-rw-r--r-- 1 root root 328 Jan 19 01:32 nsswitch.conf
drwxr-xr-x 1 root root 4096 Feb 7 11:57 openldap
lrwxrwxrwx 1 root root 19 Feb 1 19:19 os-release -> /usr/lib/os-release
-rw-r--r-- 1 root root 3264 Feb 7 11:57 pacman.conf
-rw-r--r-- 1 root root 2883 Jul 1 2020 pacman.conf.pacnew
drwxr-xr-x 1 root root 4096 Feb 7 11:57 pacman.d
drwxr-xr-x 1 root root 4096 Feb 7 11:57 pam.d
-rw-r--r-- 1 root root 744 Feb 7 11:57 passwd
-rw-r--r-- 1 root root 699 Jan 31 00:20 passwd-
drwxr-xr-x 2 root root 4096 Feb 1 19:19 pkcs11
-rw-r--r-- 1 root root 1020 Jan 19 01:32 profile
drwxr-xr-x 1 root root 4096 Feb 7 11:57 profile.d
-rw-r--r-- 1 root root 3171 Jan 3 17:14 protocols
-rw-r--r-- 1 root root 1814 Jul 7 2020 request-key.conf
drwxr-xr-x 2 root root 4096 Jul 7 2020 request-key.d
-rw-r--r-- 1 root root 649 Feb 7 11:58 resolv.conf
-rw-r--r-- 1 root root 1634 Feb 6 00:09 rpc
-rw-r--r-- 1 root root 139 Jan 19 01:32 securetty
drwxr-xr-x 2 root root 4096 Feb 1 19:19 security
-rw-r--r-- 1 root root 297708 Jan 3 17:14 services
-rw------- 1 root root 375 Feb 7 11:57 shadow
-rw------- 1 root root 346 Jan 31 00:20 shadow-
-rw-r--r-- 1 root root 83 Jan 19 01:32 shells
drwxr-xr-x 2 root root 4096 Feb 1 19:19 skel
drwxr-xr-x 5 root root 4096 Feb 1 19:19 ssl
-rw-r--r-- 1 root root 3975 Jan 26 18:34 sudo.conf
-r--r----- 1 root root 3160 Feb 7 11:57 sudoers
drwxr-x--- 2 root root 4096 Jan 26 18:34 sudoers.d
-rw-r--r-- 1 root root 6169 Jan 26 18:34 sudo_logsrvd.conf
drwxr-xr-x 2 root root 4096 Dec 16 14:38 sysctl.d
drwxr-xr-x 1 root root 4096 Feb 7 11:57 systemd
drwxr-xr-x 2 root root 4096 Dec 16 14:38 tmpfiles.d
drwxr-xr-x 1 root root 4096 Feb 7 11:57 udev
drwxr-xr-x 1 root root 4096 Feb 1 19:19 X11
-rw-r--r-- 1 root root 642 May 7 2020 xattr.conf
drwxr-xr-x 1 root root 4096 Feb 1 19:19 xdg
drwxr-xr-x 2 root root 4096 Feb 1 19:19 xinetd.d
---
#!/hint/bash
#
# /etc/makepkg.conf
#
...
SRCEXT='.src.tar.gz'
---
0
---
==> ERROR: /etc/makepkg.conf not found.
Aborting...
(The contents of /etc/makepkg.conf was concatenated.)
I also accidentally did [[ -r "/etc/makepkg.conf" ]] && echo 1 || echo 0 (as root) and I also got 0.
How is it possible that a file is not readable yet I can cat it? I also tried running the exact same commands in a local container and couldn't reproduce this issue, but this has happened every GitHub Actions run since it started.
This makes me think the Actions setup is causing an issue, but nothing seems odd there:
/usr/bin/docker build -t 442333:35a065f0b9f356b32f2852ba2f6b7296 -f "/home/runner/work/visual-studio-code-insiders-arch/visual-studio-code-insiders-arch/./.github/actions/pkg/Dockerfile" "/home/runner/work/visual-studio-code-insiders-arch/visual-studio-code-insiders-arch/.github/actions/pkg"
/usr/bin/docker run --name a065f0b9f356b32f2852ba2f6b7296_baf94b --label 442333 --workdir /github/workspace --rm -e pythonLocation -e LD_LIBRARY_PATH -e HOME -e GITHUB_JOB -e GITHUB_REF -e GITHUB_SHA -e GITHUB_REPOSITORY -e GITHUB_REPOSITORY_OWNER -e GITHUB_RUN_ID -e GITHUB_RUN_NUMBER -e GITHUB_RETENTION_DAYS -e GITHUB_ACTOR -e GITHUB_WORKFLOW -e GITHUB_HEAD_REF -e GITHUB_BASE_REF -e GITHUB_EVENT_NAME -e GITHUB_SERVER_URL -e GITHUB_API_URL -e GITHUB_GRAPHQL_URL -e GITHUB_WORKSPACE -e GITHUB_ACTION -e GITHUB_EVENT_PATH -e GITHUB_ACTION_REPOSITORY -e GITHUB_ACTION_REF -e GITHUB_PATH -e GITHUB_ENV -e RUNNER_OS -e RUNNER_TOOL_CACHE -e RUNNER_TEMP -e RUNNER_WORKSPACE -e ACTIONS_RUNTIME_URL -e ACTIONS_RUNTIME_TOKEN -e ACTIONS_CACHE_URL -e GITHUB_ACTIONS=true -e CI=true -v "/var/run/docker.sock":"/var/run/docker.sock" -v "/home/runner/work/_temp/_github_home":"/github/home" -v "/home/runner/work/_temp/_github_workflow":"/github/workflow" -v "/home/runner/work/_temp/_runner_file_commands":"/github/file_commands" -v "/home/runner/work/visual-studio-code-insiders-arch/visual-studio-code-insiders-arch":"/github/workspace" 442333:35a065f0b9f356b32f2852ba2f6b7296

Answer 1

Thanks for sharing this. I have precisely the same problems.
I added the following in my Dockerfile
RUN sed -i 's/\tif \[\[ -r $MAKEPKG_CONF \]\]; then/\tif \[\[ -f $MAKEPKG_CONF \]\]; then/' /usr/share/makepkg/util/config.sh
which replaces the check for read permission (-r) for the check whether the file exists and is a regular file (-f).
now my github action gets over this particular location, but fails with the next check:
==> ERROR: You do not have write permission for the directory $BUILDDIR (/tmp/aurutils).
Aborting...
This is not a solution and does not answer what's the underlying issue, but I hope it helps anyways.

Answer 2

This issue is caused by using glibc >= 2.33 on the container and an outdated version of the Docker engine on the host.
You can fix it by patching glibc in your container:
patched_glibc=glibc-linux4-2.33-4-x86_64.pkg.tar.zst
curl -LO https://repo.archlinuxcn.org/x86_64/$patched_glibc
bsdtar -C / -xvf $patched_glibc
Thanks to lxqt-panel for the workaround.