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Bugfix: Heisenbug when parsing console output in entropy check #1008

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Merged
mbuechse merged 1 commit into from
Oct 30, 2025
Merged

Bugfix: Heisenbug when parsing console output in entropy check #1008

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5 changes: 5 additions & 0 deletions Tests/iaas/scs_0101_entropy/entropy_check.py
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Original file line number Diff line number Diff line change
Expand Up @@ -32,11 +32,14 @@

TIMEOUT = 5 * 60 # timeout in seconds after which we no longer wait for the VM to complete the run
MARKER = '_scs-test-'
# NOTE we mask serial-getty@ttyS0.service because the login prompt messes up the console output that we want to parse
SERVER_USERDATA_GENERIC = """
#cloud-config
# apt-placeholder
packages:
- rng-tools5
bootcmd:
- systemctl mask serial-getty@ttyS0.service
runcmd:
- echo '_scs-test-entropy-avail'; cat /proc/sys/kernel/random/entropy_avail
- echo '_scs-test-fips-test'; cat /dev/random | rngtest -c 1000
Expand Down Expand Up @@ -337,6 +340,8 @@ def compute_canonical_image(all_images):
def _convert_to_collected(lines, marker=MARKER):
# parse lines from console output
# removing any "indent", stuff that looks like '[ 70.439502] cloud-init[513]: '
# NOTE this logic can fail when something (such as a login prompt) messes up the console output
# therefore we disable the corresponding service (see cloud-init)
section = None
indent = 0
collected = {}
Expand Down