sccache sudo

dev/ci/setup-sccache

@@ -10,31 +10,35 @@ if [[ -z "$SCCACHE_AZURE_CONNECTION_STRING" ]]; then
   exit 1
 fi
 
-echo "PATH=/usr/local/libexec/sccache:/usr/local/bin:$PATH" >> "$GITHUB_ENV"
-echo "SCCACHE_ERROR_LOG=$(pwd)/sccache.log" >> "$GITHUB_ENV"
-
-# Ensure Github Actions print stdout and stderr data in correct order.
+## Ensure Github Actions print stdout and stderr data in correct order.
 exec 2>&1
 set -x
 
+## Download and install sccache.
 wget --output-document sccache.tar.gz "https://github.com/mozilla/sccache/releases/download/v0.8.1/sccache-v0.8.1-$ARCH_AND_OS.tar.gz"
 tar xzf sccache.tar.gz
 rm sccache.tar.gz
 sudo mv sccache*/sccache /usr/local/bin/sccache
 rm -rf sccache*
 
+## Set up sccache as a compiler wrapper.
+echo "PATH=/usr/local/libexec/sccache:/usr/local/bin:$PATH" >> "$GITHUB_ENV"
 sudo mkdir -p /usr/local/libexec/sccache
 for PROG in cc c++; do
-FULLPATH=$(command -v "$PROG")
-echo '#!/bin/sh' > "$PROG"
-echo "exec /usr/local/bin/sccache $FULLPATH \"\$@\"" >> "$PROG"
-cat "$PROG"
-chmod +x "$PROG"
-sudo mv "$PROG" /usr/local/libexec/sccache/
+  FULLPATH=$(command -v "$PROG")
+  echo '#!/bin/sh' > "$PROG"
+  echo "exec /usr/local/bin/sccache $FULLPATH \"\$@\"" >> "$PROG"
+  chmod +x "$PROG"
+  sudo mv "$PROG" /usr/local/libexec/sccache/
 done
 
-touch sccache.log
-export SCCACHE_START_SERVER=1
-# Uncomment this to have the sccache server write debug logs to sccache.log
+## Start sccache server.
+
+## Uncomment this to have the sccache server write debug logs to sccache.log
 # export SCCACHE_LOG=debug
-sccache
+
+touch sccache.log
+echo "SCCACHE_ERROR_LOG=$(pwd)/sccache.log" >> "$GITHUB_ENV"
+
+# We sometimes run the compiler as root, so we need to give sccache root privileges as well.
+sudo env SCCACHE_START_SERVER=1 sccache

dev/ci/teardown-sccache

@@ -5,5 +5,5 @@ set -e
 exec 2>&1
 
 set -x
-sccache --stop-server
+sudo sccache --stop-server
 cat sccache.log