1 files changed, 65 insertions, 0 deletions
diff --git a/.gitlab/push-test-metrics.sh b/.gitlab/push-test-metrics.sh
new file mode 100755
index 0000000000..7ec2dfe955
--- /dev/null
+++ b/.gitlab/push-test-metrics.sh
@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+# vim: sw=2 et
+set -euo pipefail
+
+NOTES_ORIGIN="git@gitlab.haskell.org:ghc/ghc-performance-notes.git"
+REF="perf"
+
+fail() {
+  echo "ERROR: $*" >&2
+  exit 1
+}
+
+# Check that private key is available (Set on all GitLab protected branches).
+if ! [ -v PERF_NOTE_KEY ] || [ "$PERF_NOTE_KEY" = "" ]; then
+  echo "Not pushing performance git notes: PERF_NOTE_KEY is not set."
+  exit 0
+fi
+
+# TEST_ENV must be set.
+if ! [ -v TEST_ENV ] || [ "$TEST_ENV" = "" ]; then
+  fail "Not pushing performance git notes: TEST_ENV must be set."
+fi
+
+# Assert that the METRICS_FILE exists and can be read.
+if ! [ -v TEST_ENV ] || [ "$METRICS_FILE" = "" ]
+then
+  fail "\$METRICS_FILE not set."
+fi
+if ! [ -r $METRICS_FILE ]
+then
+  fail "Metrics file not found: $METRICS_FILE"
+fi
+
+# Add gitlab as a known host.
+mkdir -p ~/.ssh
+echo "|1|+AUrMGS1elvPeLNt+NHGa5+c6pU=|4XvfRsQftO1OgZD4c0JJ7oNaii8= ssh-rsa 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" >> ~/.ssh/known_hosts
+echo "|1|JZkdAPJmpX6SzGeqhmQLfMWLGQA=|4vTELroOlbFxbCr0WX+PK9EcpD0= ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJknufU+I6A5Nm58lmse4/o11Ai2UzYbYe7782J1+kRk" >> ~/.ssh/known_hosts
+
+# Setup ssh keys.
+eval `ssh-agent`
+echo "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDJPR1vrZgeGTXmgJw2PsJfMjf22LcDnVVwt3l0rwTZ+8Q2J0bHaYxMRKBco1sON6LGcZepw0Hy76RQ87v057pTz18SXvnfE7U/B6v9qBk0ILJz+4BOX9sEhxu2XmScp/wMxkG9IoyruMlsxXzd1sz09o+rzzx24U2Rp27PRm08vG0oipve6BWLbYEqYrE4/nCufqOJmGd56fju7OTU0lTpEkGDEDWGMxutaX2CbTbDju7qy07Ld8BjSc9aHfvuQaslUbj3ex3EF8EXahURzGpHQn/UFFzVGMokFumiJCAagHQb7cj6jOkKseZLaysbA/mTBQsOzjWiRmkN23bQf1wF ben+ghc-ci@smart-cactus.org" > ~/.ssh/perf_rsa.pub
+touch ~/.ssh/perf_rsa
+chmod 0600 ~/.ssh/perf_rsa
+echo "$PERF_NOTE_KEY" >> ~/.ssh/perf_rsa
+ssh-add ~/.ssh/perf_rsa
+
+# Reset the git notes and append the metrics file to the notes, then push and return the result.
+# This is favoured over a git notes merge as it avoids potential data loss/duplication from the merge strategy.
+function reset_append_note_push {
+  git fetch -f $NOTES_ORIGIN refs/notes/$REF:refs/notes/$REF || true
+  echo "git notes --ref=$REF append -F $METRICS_FILE HEAD"
+  git notes --ref=$REF append -F $METRICS_FILE HEAD
+  echo "git push $NOTES_ORIGIN refs/notes/$REF"
+  git push $NOTES_ORIGIN refs/notes/$REF
+}
+
+# Push the metrics file as a git note. This may fail if another task pushes a note first. In that case
+# the latest note is fetched and appended.
+MAX_RETRY=20
+until reset_append_note_push || [ $MAX_RETRY -le 0 ]
+do
+  ((MAX_RETRY--))
+  echo ""
+  echo "Failed to push git notes. Fetching, appending, and retrying... $MAX_RETRY retries left."
+done