ci: retry Mathlib cache fetches that drop a few transfers

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FYqwNMyPUHeTbFWg83GQq6
2026-10-21 11:08:48 +00:00
parent 066b3f158b
commit 09ea8a67ce
2 changed files with 14 additions and 2 deletions
@@ -27,7 +27,14 @@ else
  cd "$DIR"
  elan toolchain install "$(cat lean-toolchain)" >&2
  timeout 1800 lake update >&2
-  timeout 5400 lake exe cache get >&2
+  # The cache is ~9,000 files; a few transient transfer failures are normal, and a
+  # re-run fetches only what is still missing (downloads persist in ~/.cache/mathlib).
+  for attempt in 1 2 3 4; do
+    if timeout 5400 lake exe cache get >&2; then break; fi
+    [ "$attempt" -eq 4 ] && { echo "prepare-mathlib: cache get failed 4 times" >&2; exit 1; }
+    echo "prepare-mathlib: cache get attempt $attempt failed; retrying" >&2
+    sleep $((attempt * 15))
+  done
  start=$(date +%s)
  timeout 1200 lake env lean LeanBench.lean >&2 || {
    status=$?