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harden the conda install in CI against transient network failures #4704

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16 changes: 14 additions & 2 deletions .github/workflows/python_wheels.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -324,6 +324,9 @@ jobs:
run: |
retry() { for n in 1 2 3; do "$@" && return 0; [ $n -lt 3 ] && sleep $((15*n*n)); done; return 1; }
retry_dnf() { local pre=""; [ "$(id -u)" -ne 0 ] && pre=sudo; for n in 1 2 3; do $pre dnf "$@" && return 0; [ $n -lt 3 ] && { $pre dnf clean metadata >/dev/null 2>&1 || true; sleep $((15*n*n)); }; done; return 1; }
# retry(), but purges conda caches between tries so a corrupt
# download (ChecksumMismatchError) is re-fetched, not reused.
retry_conda() { for n in 1 2 3 4 5; do "$@" && return 0; [ $n -lt 5 ] && { conda clean --yes --packages --tarballs --index-cache >/dev/null 2>&1 || true; sleep $((15*n*n)); }; done; return 1; }
# Uninstall pip-installed cuda-quantum in the `wheel_validation:local` image.
# In this step, we test the full installation workflow with conda;
# hence we don't want to mix conda and pip packages.
Expand All @@ -345,6 +348,15 @@ jobs:
# conda uses classic repodata.json (slower, but reliable in CI).
export CONDA_PLUGINS_USE_SHARDED_REPODATA=0

# Retry dropped downloads (ConnectionResetError) at conda's HTTP
# layer with backoff and longer timeouts.
export CONDA_REMOTE_MAX_RETRIES=8
export CONDA_REMOTE_BACKOFF_FACTOR=2
export CONDA_REMOTE_CONNECT_TIMEOUT_SECS=30
export CONDA_REMOTE_READ_TIMEOUT_SECS=120
# Fewer parallel connections => fewer peer resets from throttling.
export CONDA_FETCH_THREADS=2

# Accept Anaconda's non-interactive ToS for the default channels;
# `conda create -n cudaq-env python=...` below hits pkgs/main.
conda tos accept --override-channels --channel https://repo.anaconda.com/pkgs/main
Expand Down Expand Up @@ -380,15 +392,15 @@ jobs:
# Fail loudly on the failing command. Without this a failed
# `conda install` is swallowed and only surfaces ~60 lines later
# as a misleading "mpirun: command not found".
if ! eval "$line"; then
if ! retry_conda eval "$line"; then
echo "::error file=python_wheel.yml::conda install step failed: $line"
exit 1
fi
done <<< "$conda_script"
ompi_script="$(awk '/(Begin ompi setup)/{flag=1;next}/(End ompi setup)/{flag=0}flag' $metadata | grep . | sed '/^```/d')"
while IFS= read -r line; do
echo "+ $line"
if ! eval "$line"; then
if ! retry eval "$line"; then
echo "::error file=python_wheel.yml::ompi setup step failed: $line"
exit 1
fi
Expand Down
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