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lix/tests/build-dry.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
###################################################
# Check that --dry-run isn't confused with read-only mode
# https://github.com/NixOS/nix/issues/1795
clearStore
clearCache
# Ensure this builds successfully first
nix build --no-link -f dependencies.nix
clearStore
clearCache
# Try --dry-run using old command first
nix-build --no-out-link dependencies.nix --dry-run 2>&1 | grep "will be built"
# Now new command:
nix build -f dependencies.nix --dry-run 2>&1 | grep "will be built"
clearStore
clearCache
# Try --dry-run using new command first
nix build -f dependencies.nix --dry-run 2>&1 | grep "will be built"
# Now old command:
nix-build --no-out-link dependencies.nix --dry-run 2>&1 | grep "will be built"
###################################################
# Check --dry-run doesn't create links with --dry-run
# https://github.com/NixOS/nix/issues/1849
clearStore
clearCache
RESULT=$TEST_ROOT/result-link
rm -f $RESULT
nix-build dependencies.nix -o $RESULT --dry-run
[[ ! -h $RESULT ]] || fail "nix-build --dry-run created output link"
nix build -f dependencies.nix -o $RESULT --dry-run
[[ ! -h $RESULT ]] || fail "nix build --dry-run created output link"
nix build -f dependencies.nix -o $RESULT
[[ -h $RESULT ]]
###################################################
# Check the JSON output
clearStore
clearCache
RES=$(nix build -f dependencies.nix --dry-run --json)
if [[ -z "${NIX_TESTS_CA_BY_DEFAULT-}" ]]; then
echo "$RES" | jq '.[0] | [
(.drvPath | test("'$NIX_STORE_DIR'.*\\.drv")),
(.outputs.out | test("'$NIX_STORE_DIR'"))
] | all'
else
echo "$RES" | jq '.[0] | [
(.drvPath | test("'$NIX_STORE_DIR'.*\\.drv")),
.outputs.out == null
] | all'
fi