fix(FastAPI): Improve sqlite testing speed

This commit adds a new Arch dependency: `libeatmydata`, which
provides the `eatmydata` executable that stubs out fsync() operations.
We use `eatmydata` to run our sharness and pytests in Docker now.

With `autocommit=True`, required by SQLAlchemy to keep the
session up to date with external DB modifications, many fsync
calls are used in the SQLite backend; especially because we're wiping
and creating records in every DB-bound test.

**Before:**

- mysql: 1m42s (elapsed during pytest run)
- sqlite: 3m06s (elapsed during pytest run)

**After:**

- mysql: 1m40s (elapsed during pytest run)
- sqlite: 1m50s (elapsed during pytest run)

Shout out to @klausenbusk, who suggested this as a possible fix,
and it was. Thanks, Kristian!

Closes #120

Signed-off-by: Kevin Morris <kevr@0cost.org>

docker/scripts/install-deps.sh

@@ -8,7 +8,7 @@ pacman -Syu --noconfirm --noprogressbar \
     --cachedir .pkg-cache git gpgme nginx redis openssh \
       mariadb mariadb-libs cgit uwsgi uwsgi-plugin-cgi \
       php php-fpm memcached php-memcached python-pip pyalpm \
-      python-srcinfo curl
+      python-srcinfo curl libeatmydata
 
 # https://python-poetry.org/docs/ Installation section.
 curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python -

docker/scripts/run-pytests.sh

@@ -27,7 +27,7 @@ python -m aurweb.initdb 2>/dev/null || \
     (echo "Error: aurweb.initdb failed; already initialized?" && /bin/true)
 
 # Run pytest with optional targets in front of it.
-make -C test "${PARAMS[@]}" pytest
+eatmydata -- make -C test "${PARAMS[@]}" pytest
 
 # By default, report coverage and move it into cache.
 if [ $COVERAGE -eq 1 ]; then

docker/scripts/run-sharness.sh

@@ -4,4 +4,4 @@ set -eou pipefail
 # Initialize the new database; ignore errors.
 python -m aurweb.initdb 2>/dev/null || /bin/true
 
-make -C test sh
+eatmydata -- make -C test sh

test/README.md

@@ -31,6 +31,10 @@ For all the test to run, the following Arch packages should be installed:
 - postfix
 - openssh
 
+Optional (faster testing)
+
+- libeatmydata
+
 Test Configuration
 ------------------
 
@@ -115,6 +119,12 @@ To run `pytest` Python test suites:
 
     $ make -C test pytest
 
+**Note:** For SQLite tests, users may want to use `eatmydata`
+to improve speed:
+
+    $ eatmydata -- make -C test sh
+    $ eatmydata -- make -C test pytest
+
 To produce coverage reports related to Python when running tests manually,
 use the following method: