test-install: Run installer under eatmydata.

This is a tool that throws away `fsync` calls and other requests for
the system to sync files to disk.  It may make the install faster; for
example, if it has to install a number of system packages, `dpkg` is
known to make a lot of `fsync` calls which slow things down
significantly.  Conversely, if there's a power failure in the middle
of running a test install, we really don't mind if the test install's
data becomes corrupt.

tools/test-install/install

@@ -71,9 +71,7 @@ if [ -z "ok" ]; then
     exit 1
 fi
 
-run /tmp/src/zulip-server/scripts/setup/install --snakeoil-cert "${INSTALLER_ARGS[@]}"
+run eatmydata -- /tmp/src/zulip-server/scripts/setup/install --snakeoil-cert "${INSTALLER_ARGS[@]}"
 # TODO install ends as a zombie (workaround: `sudo ps aux | grep lxc-attach`, kill that)
 
 # TODO settings.py, initialize-database, create realm
-
-# TODO eatmydata, for speed

tools/test-install/prepare-base

@@ -37,7 +37,7 @@ run apt-get update
 # As an optimization, we install a bunch of packages the installer
 # would install for itself.
 run apt-get install -y --no-install-recommends \
-  xvfb parallel netcat unzip zip jq python3-pip wget curl realpath \
+  xvfb parallel netcat unzip zip jq python3-pip wget curl realpath eatmydata \
   git crudini openssl ssl-cert \
   build-essential python3-dev \
   closure-compiler memcached rabbitmq-server redis-server \