lix/tests/flakes/build-paths.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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source ./common.sh
flake1Dir=$TEST_ROOT/flake1
flake2Dir=$TEST_ROOT/flake2
mkdir -p $flake1Dir $flake2Dir
writeSimpleFlake $flake2Dir
tar cfz $TEST_ROOT/flake.tar.gz -C $TEST_ROOT flake2
hash=$(nix hash path $flake2Dir)
dep=$(nix store add-path ./common.sh)
cat > $flake1Dir/flake.nix <<EOF
{
inputs.flake2.url = "file://$TEST_ROOT/flake.tar.gz";
outputs = { self, flake2 }: {
a1 = builtins.fetchTarball {
#type = "tarball";
url = "file://$TEST_ROOT/flake.tar.gz";
sha256 = "$hash";
};
a2 = ./foo;
a3 = ./.;
a4 = self.outPath;
# FIXME
a5 = self;
a6 = flake2.outPath;
# FIXME
a7 = "\${flake2}/config.nix";
# This is only allowed in impure mode.
a8 = builtins.storePath $dep;
a9 = "$dep";
};
}
EOF
echo bar > $flake1Dir/foo
nix build --json --out-link $TEST_ROOT/result $flake1Dir#a1
[[ -e $TEST_ROOT/result/simple.nix ]]
nix build --json --out-link $TEST_ROOT/result $flake1Dir#a2
[[ $(cat $TEST_ROOT/result) = bar ]]
nix build --json --out-link $TEST_ROOT/result $flake1Dir#a3
nix build --json --out-link $TEST_ROOT/result $flake1Dir#a4
nix build --json --out-link $TEST_ROOT/result $flake1Dir#a6
[[ -e $TEST_ROOT/result/simple.nix ]]
nix build --impure --json --out-link $TEST_ROOT/result $flake1Dir#a8
diff common.sh $TEST_ROOT/result
(! nix build --impure --json --out-link $TEST_ROOT/result $flake1Dir#a9)