From 4d83cc347f6ea6fbf3980fab805b208c3e64ef14 Mon Sep 17 00:00:00 2001
From: Nick Fitzgerald <fitzgen@gmail.com>
Date: Thu, 19 Dec 2019 16:39:32 -0800
Subject: [PATCH] ci: don't run full fuzz corpora

Our corpora are too large to run in full on every pull request, they just take
too long. Instead, we sample some of them and make sure that running our fuzzers
over the sampled inputs still works OK.
---
 .github/workflows/main.yml | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index de8ece714f..de3c5c6674 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -79,15 +79,33 @@ jobs:
     - uses: ./.github/actions/install-rust
       with:
         toolchain: nightly
-    - run: cargo install cargo-fuzz
+    - run: cargo install cargo-fuzz --vers "^0.6"
     - run: cargo fetch
       working-directory: ./fuzz
-    # NB: the `-runs=0` means that libFuzzer won't generate new inputs, only run
-    # the seeds from the corpus.
-    - run: cargo fuzz run compile                --release --debug-assertions -- -runs=0
-    - run: cargo fuzz run instantiate            --release --debug-assertions -- -runs=0
-    - run: cargo fuzz run instantiate_translated --release --debug-assertions -- -runs=0
-    - run: cargo fuzz run api_calls              --release --debug-assertions -- -runs=0
+    - run: cargo fuzz build --release --debug-assertions
+    # Our corpora are too large to run in full on every pull request, they just
+    # take too long. Instead, we sample some of them and make sure that running
+    # our fuzzers over the sampled inputs still works OK.
+    - run: |
+        find fuzz/corpus/compile -type f \
+            | shuf \
+            | head -n 3000 \
+            | xargs cargo fuzz run compile --release --debug-assertions
+    - run: |
+        find fuzz/corpus/instantiate -type f \
+            | shuf \
+            | head -n 2000 \
+            | xargs cargo fuzz run instantiate --release --debug-assertions
+    - run: |
+        find fuzz/corpus/instantiate_translated -type f \
+            | shuf \
+            | head -n 1000 \
+            | xargs cargo fuzz run instantiate_translated --release --debug-assertions
+    - run: |
+        find fuzz/corpus/api_calls -type f \
+            | shuf \
+            | head -n 100 \
+            | xargs cargo fuzz run api_calls --release --debug-assertions
 
   # Install wasm32-unknown-emscripten target, and ensure `crates/wasi-common`
   # compiles to Emscripten.