mirror of
https://github.com/NixOS/nix.git
synced 2024-11-22 23:02:27 +00:00
c11836126b
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>
86 lines
1.9 KiB
Bash
86 lines
1.9 KiB
Bash
# Test the functions for testing themselves!
|
|
# Also test some assumptions on how bash works that they rely on.
|
|
source common.sh
|
|
|
|
# `true` should exit with 0
|
|
expect 0 true
|
|
|
|
# `false` should exit with 1
|
|
expect 1 false
|
|
|
|
# `expect` will fail when we get it wrong
|
|
expect 1 expect 0 false
|
|
|
|
noisyTrue () {
|
|
echo YAY! >&2
|
|
true
|
|
}
|
|
|
|
noisyFalse () {
|
|
echo NAY! >&2
|
|
false
|
|
}
|
|
|
|
# These should redirect standard error to standard output
|
|
expectStderr 0 noisyTrue | grepQuiet YAY
|
|
expectStderr 1 noisyFalse | grepQuiet NAY
|
|
|
|
# `set -o pipefile` is enabled
|
|
|
|
pipefailure () {
|
|
# shellcheck disable=SC2216
|
|
true | false | true
|
|
}
|
|
expect 1 pipefailure
|
|
unset pipefailure
|
|
|
|
pipefailure () {
|
|
# shellcheck disable=SC2216
|
|
false | true | true
|
|
}
|
|
expect 1 pipefailure
|
|
unset pipefailure
|
|
|
|
commandSubstitutionPipeFailure () {
|
|
# shellcheck disable=SC2216
|
|
res=$(set -eu -o pipefail; false | true | echo 0)
|
|
}
|
|
expect 1 commandSubstitutionPipeFailure
|
|
|
|
# `set -u` is enabled
|
|
|
|
# note (...), making function use subshell, as unbound variable errors
|
|
# in the outer shell are *rightly* not recoverable.
|
|
useUnbound () (
|
|
set -eu
|
|
# shellcheck disable=SC2154
|
|
echo "$thisVariableIsNotBound"
|
|
)
|
|
expect 1 useUnbound
|
|
|
|
# ! alone unfortunately negates `set -e`, but it works in functions:
|
|
# shellcheck disable=SC2251
|
|
! true
|
|
funBang () {
|
|
! true
|
|
}
|
|
expect 1 funBang
|
|
unset funBang
|
|
|
|
# `grep -v -q` is not what we want for exit codes, but `grepInverse` is
|
|
# Avoid `grep -v -q`. The following line proves the point, and if it fails,
|
|
# we'll know that `grep` had a breaking change or `-v -q` may not be portable.
|
|
{ echo foo; echo bar; } | grep -v -q foo
|
|
{ echo foo; echo bar; } | expect 1 grepInverse foo
|
|
|
|
# `grepQuiet` is quiet
|
|
res=$(set -eu -o pipefail; echo foo | grepQuiet foo | wc -c)
|
|
(( res == 0 ))
|
|
unset res
|
|
|
|
# `greqQietInverse` is both
|
|
{ echo foo; echo bar; } | expect 1 grepQuietInverse foo
|
|
res=$(set -eu -o pipefail; echo foo | expect 1 grepQuietInverse foo | wc -c)
|
|
(( res == 0 ))
|
|
unset res
|