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lix/tests/init.sh
John Ericson c11836126b Harden tests' bash
Use `set -u` and `set -o pipefail` to catch accidental mistakes and
failures more strongly.

 - `set -u` catches the use of undefined variables
 - `set -o pipefail` catches failures (like `set -e`) earlier in the
   pipeline.

This makes the tests a bit more robust. It is nice to read code not
worrying about these spurious success paths (via uncaught) errors
undermining the tests. Indeed, I caught some bugs doing this.

There are a few tests where we run a command that should fail, and then
search its output to make sure the failure message is one that we
expect. Before, since the `grep` was the last command in the pipeline
the exit code of those failing programs was silently ignored. Now with
`set -o pipefail` it won't be, and we have to do something so the
expected failure doesn't accidentally fail the test.

To do that we use `expect` and a new `expectStderr` to check for the
exact failing exit code. See the comments on each for why.

`grep -q` is replaced with `grepQuiet`, see the comments on that
function for why.

`grep -v` when we just want the exit code is replaced with `grepInverse,
see the comments on that function for why.

`grep -q -v` together is, surprise surprise, replaced with
`grepQuietInverse`, which is both combined.

Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
2023-03-08 10:26:30 -05:00

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# Don't start the daemon
source common/vars-and-functions.sh
test -n "$TEST_ROOT"
if test -d "$TEST_ROOT"; then
chmod -R u+w "$TEST_ROOT"
# We would delete any daemon socket, so let's stop the daemon first.
killDaemon
rm -rf "$TEST_ROOT"
fi
mkdir "$TEST_ROOT"
mkdir "$NIX_STORE_DIR"
mkdir "$NIX_LOCALSTATE_DIR"
mkdir -p "$NIX_LOG_DIR"/drvs
mkdir "$NIX_STATE_DIR"
mkdir "$NIX_CONF_DIR"
cat > "$NIX_CONF_DIR"/nix.conf <<EOF
build-users-group =
keep-derivations = false
sandbox = false
experimental-features = nix-command flakes
gc-reserved-space = 0
substituters =
flake-registry = $TEST_ROOT/registry.json
show-trace = true
include nix.conf.extra
trusted-users = $(whoami)
EOF
cat > "$NIX_CONF_DIR"/nix.conf.extra <<EOF
fsync-metadata = false
!include nix.conf.extra.not-there
EOF
# Initialise the database.
nix-store --init
# Did anything happen?
test -e "$NIX_STATE_DIR"/db/db.sqlite