ci: Enable pipefail in 03_test_script.sh #34801

The CI script is problematic, because it is written in Bash, without pipefail enabled. Thus, some failures are silently ignored.

Enabling pipefail is a bit tedious, because:

• The IWYU task has no (--verbose) ccache output, so the pipe fails after grep [1]. Also, right now on master, the if silently skips: ci/test/03_test_script.sh: line 122: [: : integer expression expected.
• The Alpine task has Hits: twice in the output, so the pipe fails after head -1 [2]

Not sure what the easiest way to fix this would be. Some options are:

• Just use tail -1 and 0 as fallback: hit_rate=$(ccache --show-stats | grep "Hits:" | tail -1 | sed 's/.*(\(.*\)%).*/\1/' || echo "0")
• Properly parse, using Python and --print-stats (this pull)

[1]

+ ccache --version
+ head -n 1
ccache version 4.11.2
+ ccache --show-stats --verbose
Cache directory:    /home/admin/actions-runner/_work/_temp/ccache_dir
Config file:        /home/admin/actions-runner/_work/_temp/ccache_dir/ccache.conf
System config file: /etc/ccache.conf
Stats updated:      Tue Feb 17 08:40:20 2026
Local storage:
  Cache size (GB):  0.0 / 2.0 ( 0.00%)
  Files:              0
  Hits:               0
  Misses:             0
  Reads:              0
  Writes:             0
++ ccache --show-stats
++ grep Hits:
++ head -1
++ sed 's/.*(\(.*\)%).*/\1/'
+ hit_rate=
Command '['docker', 'exec', '--env', 'DANGER_RUN_CI_ON_HOST=1', 'f5e8f319c22101ada5be9d4c5fd7d883ce37b830e86ec64627cb7d2b96749053', '/home/admin/actions-runner/_work/_temp/ci/test/03_test_script.sh']' returned non-zero exit status 1.
Error: Process completed with exit code 1.

[2]

+ ccache --version
+ head -n 1
ccache version 4.12.1
+ ccache --show-stats --verbose
Cache directory:    /home/admin/actions-runner/_work/_temp/ccache_dir
Config file:        /home/admin/actions-runner/_work/_temp/ccache_dir/ccache.conf
System config file: /etc/ccache.conf
Stats updated:      Tue Feb 17 08:40:35 2026
Cacheable calls:     873 / 873 (100.0%)
  Hits:              846 / 873 (96.91%)
    Direct:          822 / 846 (97.16%)
    Preprocessed:     24 / 846 ( 2.84%)
  Misses:             27 / 873 ( 3.09%)
Successful lookups:
  Direct:            822 / 873 (94.16%)
  Preprocessed:       24 /  51 (47.06%)
Local storage:
  Cache size (GB):   2.0 / 2.0 (99.95%)
  Files:            2580
  Cleanups:           13
  Hits:              846 / 873 (96.91%)
  Misses:             27 / 873 ( 3.09%)
  Reads:            1772
  Writes:             52
++ ccache --show-stats
++ grep Hits:
++ head -1
++ sed 's/.*(\(.*\)%).*/\1/'
+ hit_rate=96.91
Command '['docker', 'exec', '--env', 'DANGER_RUN_CI_ON_HOST=1', '272a66a48206f1f6096612e196127ce46ea4dbff5dc14be3a4a20c4ee523956f', '/home/admin/actions-runner/_work/_temp/ci/test/03_test_script.sh']' returned non-zero exit status 141.
Error: Process completed with exit code 1.

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Draft for now, because CI fails here IIRC.

How about:

ccache --version
ccache --show-stats --verbose
ccache --print-stats | python3 -c '
import os
import sys

hits = 0
miss = 0

for line in sys.stdin:
    key, value = line.split("\t", 1)
    if key in ("local_storage_hit", "primary_storage_hit"):
        hits = int(value)
    elif key in ("local_storage_miss", "primary_storage_miss"):
        miss = int(value)

calls = hits + miss
rate = (hits / calls * 100) if calls else 0
print(f"{rate:.2f}")
if rate < 75:
    container = os.environ["CONTAINER_NAME"]
    print(
        "::notice title=low ccache hitrate::"
        f"Ccache hit-rate in {container} was {rate:.2f}%"
    )
'

No possible pipe failures in this non-critical section, I think :)

(slightly more verbose logs, but I think that's fine?)

Approach ACK 0509ac7743b8234964db52ae31464edf2f614ae1

Enabling pipefail in ci/test/03_test_script.sh and replacing the fragile ccache hit-rate shell parsing with a clean Python script (using --print-stats) is a nice cleanup.