98946e2d9c
Basically an attempt to resume fixing #5543 for a breakage introduced
earlier[1]. Basically, when evaluating an older `nixpkgs` with
`nix-shell` the following error occurs:
λ ma27 [~] → nix-shell -I nixpkgs=channel:nixos-18.03 -p nix
error: anonymous function at /nix/store/zakqwc529rb6xcj8pwixjsxscvlx9fbi-source/pkgs/top-level/default.nix:20:1 called with unexpected argument 'inNixShell'
at /nix/store/zakqwc529rb6xcj8pwixjsxscvlx9fbi-source/pkgs/top-level/impure.nix:82:1:
81|
82| import ./. (builtins.removeAttrs args [ "system" "platform" ] // {
| ^
83| inherit config overlays crossSystem;
This is a problem because one of the main selling points of Nix is that
you can evaluate any old Nix expression and still get the same result
(which also means that it *still evaluates*). In fact we're deprecating,
but not removing a lot of stuff for that reason such as unquoted URLs[2]
or `builtins.toPath`. However this property was essentially thrown away
here.
The change is rather simple: check if `inNixShell` is specified in the
formals of an auto-called function. This means that
{ inNixShell ? false }:
builtins.trace inNixShell
(with import <nixpkgs> { }; makeShell { name = "foo"; })
will show `trace: true` while
args@{ ... }:
builtins.trace args.inNixShell
(with import <nixpkgs> { }; makeShell { name = "foo"; })
will throw the following error:
error: attribute 'inNixShell' missing
This is explicitly needed because the function in
`pkgs/top-level/impure.nix` of e.g. NixOS 18.03 has an ellipsis[3], but
passes the attribute-set on to another lambda with formals that doesn't
have an ellipsis anymore (hence the error from above). This was perhaps
a mistake, but we can't fix it anymore. This also means that there's
AFAICS no proper way to check if the attr-set that's passed to the Nix
code via `EvalState::autoCallFunction` is eventually passed to a lambda
with formals where `inNixShell` is missing.
However, this fix comes with a certain price. Essentially every
`shell.nix` that assumes `inNixShell` to be passed to the formals even
without explicitly specifying it would break with this[4]. However I think
that this is ugly, but preferable:
* Nix 2.3 was declared stable by NixOS up until recently (well, it still
is as long as 21.11 is alive), so most people might not have even
noticed that feature.
* We're talking about a way shorter time-span with this change being
in the wild, so the fallout should be smaller IMHO.
[1] 9d612c393a
[2] https://github.com/NixOS/rfcs/pull/45#issuecomment-488232537
[3] https://github.com/NixOS/nixpkgs/blob/release-18.03/pkgs/top-level/impure.nix#L75
[4] See e.g. the second expression in this commit-message or the changes
for `tests/ca/nix-shell.sh`.
112 lines
4.4 KiB
Bash
112 lines
4.4 KiB
Bash
source common.sh
|
|
|
|
clearStore
|
|
|
|
if [[ -n ${CONTENT_ADDRESSED:-} ]]; then
|
|
shellDotNix="$PWD/ca-shell.nix"
|
|
else
|
|
shellDotNix="$PWD/shell.nix"
|
|
fi
|
|
|
|
export NIX_PATH=nixpkgs="$shellDotNix"
|
|
|
|
# Test nix-shell -A
|
|
export IMPURE_VAR=foo
|
|
export SELECTED_IMPURE_VAR=baz
|
|
|
|
output=$(nix-shell --pure "$shellDotNix" -A shellDrv --run \
|
|
'echo "$IMPURE_VAR - $VAR_FROM_STDENV_SETUP - $VAR_FROM_NIX - $TEST_inNixShell"')
|
|
|
|
[ "$output" = " - foo - bar - true" ]
|
|
|
|
# Test --keep
|
|
output=$(nix-shell --pure --keep SELECTED_IMPURE_VAR "$shellDotNix" -A shellDrv --run \
|
|
'echo "$IMPURE_VAR - $VAR_FROM_STDENV_SETUP - $VAR_FROM_NIX - $SELECTED_IMPURE_VAR"')
|
|
|
|
[ "$output" = " - foo - bar - baz" ]
|
|
|
|
# Test nix-shell on a .drv
|
|
[[ $(nix-shell --pure $(nix-instantiate "$shellDotNix" -A shellDrv) --run \
|
|
'echo "$IMPURE_VAR - $VAR_FROM_STDENV_SETUP - $VAR_FROM_NIX - $TEST_inNixShell"') = " - foo - bar - false" ]]
|
|
|
|
[[ $(nix-shell --pure $(nix-instantiate "$shellDotNix" -A shellDrv) --run \
|
|
'echo "$IMPURE_VAR - $VAR_FROM_STDENV_SETUP - $VAR_FROM_NIX - $TEST_inNixShell"') = " - foo - bar - false" ]]
|
|
|
|
# Test nix-shell on a .drv symlink
|
|
|
|
# Legacy: absolute path and .drv extension required
|
|
nix-instantiate "$shellDotNix" -A shellDrv --add-root $TEST_ROOT/shell.drv
|
|
[[ $(nix-shell --pure $TEST_ROOT/shell.drv --run \
|
|
'echo "$IMPURE_VAR - $VAR_FROM_STDENV_SETUP - $VAR_FROM_NIX"') = " - foo - bar" ]]
|
|
|
|
# New behaviour: just needs to resolve to a derivation in the store
|
|
nix-instantiate "$shellDotNix" -A shellDrv --add-root $TEST_ROOT/shell
|
|
[[ $(nix-shell --pure $TEST_ROOT/shell --run \
|
|
'echo "$IMPURE_VAR - $VAR_FROM_STDENV_SETUP - $VAR_FROM_NIX"') = " - foo - bar" ]]
|
|
|
|
# Test nix-shell -p
|
|
output=$(NIX_PATH=nixpkgs="$shellDotNix" nix-shell --pure -p foo bar --run 'echo "$(foo) $(bar)"')
|
|
[ "$output" = "foo bar" ]
|
|
|
|
# Test nix-shell -p --arg x y
|
|
output=$(NIX_PATH=nixpkgs="$shellDotNix" nix-shell --pure -p foo --argstr fooContents baz --run 'echo "$(foo)"')
|
|
[ "$output" = "baz" ]
|
|
|
|
# Test nix-shell shebang mode
|
|
sed -e "s|@ENV_PROG@|$(type -P env)|" shell.shebang.sh > $TEST_ROOT/shell.shebang.sh
|
|
chmod a+rx $TEST_ROOT/shell.shebang.sh
|
|
|
|
output=$($TEST_ROOT/shell.shebang.sh abc def)
|
|
[ "$output" = "foo bar abc def" ]
|
|
|
|
# Test nix-shell shebang mode again with metacharacters in the filename.
|
|
# First word of filename is chosen to not match any file in the test root.
|
|
sed -e "s|@ENV_PROG@|$(type -P env)|" shell.shebang.sh > $TEST_ROOT/spaced\ \\\'\"shell.shebang.sh
|
|
chmod a+rx $TEST_ROOT/spaced\ \\\'\"shell.shebang.sh
|
|
|
|
output=$($TEST_ROOT/spaced\ \\\'\"shell.shebang.sh abc def)
|
|
[ "$output" = "foo bar abc def" ]
|
|
|
|
# Test nix-shell shebang mode for ruby
|
|
# This uses a fake interpreter that returns the arguments passed
|
|
# This, in turn, verifies the `rc` script is valid and the `load()` script (given using `-e`) is as expected.
|
|
sed -e "s|@SHELL_PROG@|$(type -P nix-shell)|" shell.shebang.rb > $TEST_ROOT/shell.shebang.rb
|
|
chmod a+rx $TEST_ROOT/shell.shebang.rb
|
|
|
|
output=$($TEST_ROOT/shell.shebang.rb abc ruby)
|
|
[ "$output" = '-e load(ARGV.shift) -- '"$TEST_ROOT"'/shell.shebang.rb abc ruby' ]
|
|
|
|
# Test nix-shell shebang mode for ruby again with metacharacters in the filename.
|
|
# Note: fake interpreter only space-separates args without adding escapes to its output.
|
|
sed -e "s|@SHELL_PROG@|$(type -P nix-shell)|" shell.shebang.rb > $TEST_ROOT/spaced\ \\\'\"shell.shebang.rb
|
|
chmod a+rx $TEST_ROOT/spaced\ \\\'\"shell.shebang.rb
|
|
|
|
output=$($TEST_ROOT/spaced\ \\\'\"shell.shebang.rb abc ruby)
|
|
[ "$output" = '-e load(ARGV.shift) -- '"$TEST_ROOT"'/spaced \'\''"shell.shebang.rb abc ruby' ]
|
|
|
|
# Test 'nix develop'.
|
|
nix develop -f "$shellDotNix" shellDrv -c bash -c '[[ -n $stdenv ]]'
|
|
|
|
# Ensure `nix develop -c` preserves stdin
|
|
echo foo | nix develop -f "$shellDotNix" shellDrv -c cat | grep -q foo
|
|
|
|
# Ensure `nix develop -c` actually executes the command if stdout isn't a terminal
|
|
nix develop -f "$shellDotNix" shellDrv -c echo foo |& grep -q foo
|
|
|
|
# Test 'nix print-dev-env'.
|
|
[[ $(nix print-dev-env -f "$shellDotNix" shellDrv --json | jq -r .variables.arr1.value[2]) = '3 4' ]]
|
|
|
|
source <(nix print-dev-env -f "$shellDotNix" shellDrv)
|
|
[[ -n $stdenv ]]
|
|
[[ ${arr1[2]} = "3 4" ]]
|
|
[[ ${arr2[1]} = $'\n' ]]
|
|
[[ ${arr2[2]} = $'x\ny' ]]
|
|
[[ $(fun) = blabla ]]
|
|
|
|
# Test nix-shell with ellipsis and no `inNixShell` argument (for backwards compat with old nixpkgs)
|
|
cat >$TEST_ROOT/shell-ellipsis.nix <<EOF
|
|
{ system ? "x86_64-linux", ... }:
|
|
(import $shellDotNix { }).shellDrv
|
|
EOF
|
|
nix-shell $TEST_ROOT/shell-ellipsis.nix --run "true"
|