lix/tests/functional/flakes/flakes.sh

source ./common.sh

requireGit

clearStore
rm -rf $TEST_HOME/.cache $TEST_HOME/.config

flake1Dir=$TEST_ROOT/flake1
flake2Dir=$TEST_ROOT/flake\ 2
percentEncodedFlake2Dir=$TEST_ROOT/flake%202
flake3Dir=$TEST_ROOT/flake%20
percentEncodedFlake3Dir=$TEST_ROOT/flake%2520
flake5Dir=$TEST_ROOT/flake5
flake7Dir=$TEST_ROOT/flake7
nonFlakeDir=$TEST_ROOT/nonFlake
badFlakeDir=$TEST_ROOT/badFlake
flakeGitBare=$TEST_ROOT/flakeGitBare

for repo in "$flake1Dir" "$flake2Dir" "$flake3Dir" "$flake7Dir" "$nonFlakeDir"; do
    # Give one repo a non-main initial branch.
    extraArgs=
    if [[ "$repo" == "$flake2Dir" ]]; then
      extraArgs="--initial-branch=main"
    fi

    createGitRepo "$repo" "$extraArgs"
done

createSimpleGitFlake "$flake1Dir"

cat > "$flake2Dir/flake.nix" <<EOF
{
  description = "Fnord";

  outputs = { self, flake1 }: rec {
    packages.$system.bar = flake1.packages.$system.foo;
  };
}
EOF

git -C "$flake2Dir" add flake.nix
git -C "$flake2Dir" commit -m 'Initial'

cat > "$flake3Dir/flake.nix" <<EOF
{
  description = "Fnord";

  outputs = { self, flake2 }: rec {
    packages.$system.xyzzy = flake2.packages.$system.bar;

    checks = {
      xyzzy = packages.$system.xyzzy;
    };
  };
}
EOF

cat > "$flake3Dir/default.nix" <<EOF
{ x = 123; }
EOF

git -C "$flake3Dir" add flake.nix default.nix
git -C "$flake3Dir" commit -m 'Initial'

cat > "$nonFlakeDir/README.md" <<EOF
FNORD
EOF

cat > "$nonFlakeDir/shebang.sh" <<EOF
#! $(type -P env) nix
#! nix --offline shell
#! nix flake1#fooScript
#! nix --no-write-lock-file --command bash
set -ex
foo
echo "\$@"
EOF
chmod +x "$nonFlakeDir/shebang.sh"

git -C "$nonFlakeDir" add README.md shebang.sh
git -C "$nonFlakeDir" commit -m 'Initial'

# this also tests a fairly trivial double backtick quoted string, ``--command``
cat > $nonFlakeDir/shebang-comments.sh <<EOF
#! $(type -P env) nix
# some comments
# some comments
# some comments
#! nix --offline shell
#! nix flake1#fooScript
#! nix --no-write-lock-file ``--command`` bash
foo
EOF
chmod +x $nonFlakeDir/shebang-comments.sh

cat > $nonFlakeDir/shebang-reject.sh <<EOF
#! $(type -P env) nix
# some comments
# some comments
# some comments
#! nix --offline shell *
#! nix flake1#fooScript
#! nix --no-write-lock-file --command bash
foo
EOF
chmod +x $nonFlakeDir/shebang-reject.sh

cat > $nonFlakeDir/shebang-inline-expr.sh <<EOF
#! $(type -P env) nix
EOF
cat >> $nonFlakeDir/shebang-inline-expr.sh <<"EOF"
#! nix --offline shell
#! nix --impure --expr ``
#! nix let flake = (builtins.getFlake (toString ../flake1)).packages;
#! nix     fooScript = flake.${builtins.currentSystem}.fooScript;
#! nix     /* just a comment !@#$%^&*()__+ # */
#! nix  in fooScript
#! nix ``
#! nix --no-write-lock-file --command bash
set -ex
foo
echo "$@"
EOF
chmod +x $nonFlakeDir/shebang-inline-expr.sh

cat > $nonFlakeDir/fooScript.nix <<"EOF"
let flake = (builtins.getFlake (toString ../flake1)).packages;
    fooScript = flake.${builtins.currentSystem}.fooScript;
 in fooScript
EOF

cat > $nonFlakeDir/shebang-file.sh <<EOF
#! $(type -P env) nix
EOF
cat >> $nonFlakeDir/shebang-file.sh <<"EOF"
#! nix --offline shell
#! nix --impure --file ./fooScript.nix
#! nix --no-write-lock-file --command bash
set -ex
foo
echo "$@"
EOF
chmod +x $nonFlakeDir/shebang-file.sh

# Construct a custom registry, additionally test the --registry flag
nix registry add --registry "$registry" flake1 "git+file://$flake1Dir"
nix registry add --registry "$registry" flake2 "git+file://$percentEncodedFlake2Dir"
nix registry add --registry "$registry" flake3 "git+file://$percentEncodedFlake3Dir"
nix registry add --registry "$registry" flake4 flake3
nix registry add --registry "$registry" nixpkgs flake1

# Test 'nix registry list'.
[[ $(nix registry list | wc -l) == 5 ]]
nix registry list | grep        '^global'
nix registry list | grepInverse '^user' # nothing in user registry

# Test 'nix flake metadata'.
nix flake metadata flake1
nix flake metadata flake1 | grepQuiet 'Locked URL:.*flake1.*'

# Test 'nix flake metadata' on a local flake.
(cd "$flake1Dir" && nix flake metadata) | grepQuiet 'URL:.*flake1.*'
(cd "$flake1Dir" && nix flake metadata .) | grepQuiet 'URL:.*flake1.*'
nix flake metadata "$flake1Dir" | grepQuiet 'URL:.*flake1.*'

# Test 'nix flake metadata --json'.
json=$(nix flake metadata flake1 --json | jq .)
[[ $(echo "$json" | jq -r .description) = 'Bla bla' ]]
[[ -d $(echo "$json" | jq -r .path) ]]
[[ $(echo "$json" | jq -r .lastModified) = $(git -C "$flake1Dir" log -n1 --format=%ct) ]]
hash1=$(echo "$json" | jq -r .revision)

echo foo > "$flake1Dir/foo"
git -C "$flake1Dir" add $flake1Dir/foo
[[ $(nix flake metadata flake1 --json --refresh | jq -r .dirtyRevision) == "$hash1-dirty" ]]

echo -n '# foo' >> "$flake1Dir/flake.nix"
flake1OriginalCommit=$(git -C "$flake1Dir" rev-parse HEAD)
git -C "$flake1Dir" commit -a -m 'Foo'
flake1NewCommit=$(git -C "$flake1Dir" rev-parse HEAD)
hash2=$(nix flake metadata flake1 --json --refresh | jq -r .revision)
[[ $(nix flake metadata flake1 --json --refresh | jq -r .dirtyRevision) == "null" ]]
[[ $hash1 != $hash2 ]]

# Test 'nix build' on a flake.
nix build -o "$TEST_ROOT/result" flake1#foo
[[ -e "$TEST_ROOT/result/hello" ]]

# Test packages.default.
nix build -o "$TEST_ROOT/result" flake1
[[ -e "$TEST_ROOT/result/hello" ]]

nix build -o "$TEST_ROOT/result" "$flake1Dir"
nix build -o "$TEST_ROOT/result" "git+file://$flake1Dir"

# Check that store symlinks inside a flake are not interpreted as flakes.
nix build -o "$flake1Dir/result" "git+file://$flake1Dir"
nix path-info "$flake1Dir/result"

# 'getFlake' on an unlocked flakeref should fail in pure mode, but
# succeed in impure mode.
(! nix build -o "$TEST_ROOT/result" --expr "(builtins.getFlake \"$flake1Dir\").packages.$system.default")
nix build -o "$TEST_ROOT/result" --expr "(builtins.getFlake \"$flake1Dir\").packages.$system.default" --impure

# 'getFlake' on a locked flakeref should succeed even in pure mode.
nix build -o "$TEST_ROOT/result" --expr "(builtins.getFlake \"git+file://$flake1Dir?rev=$hash2\").packages.$system.default"

# Building a flake with an unlocked dependency should fail in pure mode.
(! nix build -o "$TEST_ROOT/result" flake2#bar --no-registries)
(! nix build -o "$TEST_ROOT/result" flake2#bar --no-use-registries)
(! nix eval --expr "builtins.getFlake \"$flake2Dir\"")

# But should succeed in impure mode.
(! nix build -o "$TEST_ROOT/result" flake2#bar --impure)
nix build -o "$TEST_ROOT/result" flake2#bar --impure --no-write-lock-file
nix eval --expr "builtins.getFlake \"$flake2Dir\"" --impure

# Building a local flake with an unlocked dependency should fail with --no-update-lock-file.
expect 1 nix build -o "$TEST_ROOT/result" "$flake2Dir#bar" --no-update-lock-file 2>&1 | grep 'requires lock file changes'

# But it should succeed without that flag.
nix build -o "$TEST_ROOT/result" "$flake2Dir#bar" --no-write-lock-file
expect 1 nix build -o "$TEST_ROOT/result" "$flake2Dir#bar" --no-update-lock-file 2>&1 | grep 'requires lock file changes'
nix build -o "$TEST_ROOT/result" "$flake2Dir#bar" --commit-lock-file
[[ -e "$flake2Dir/flake.lock" ]]
[[ -z $(git -C "$flake2Dir" diff main || echo failed) ]]

# Rerunning the build should not change the lockfile.
nix build -o "$TEST_ROOT/result" "$flake2Dir#bar"
[[ -z $(git -C "$flake2Dir" diff main || echo failed) ]]

# Building with a lockfile should not require a fetch of the registry.
nix build -o "$TEST_ROOT/result" --flake-registry file:///no-registry.json "$flake2Dir#bar" --refresh
nix build -o "$TEST_ROOT/result" --no-registries "$flake2Dir#bar" --refresh
nix build -o "$TEST_ROOT/result" --no-use-registries "$flake2Dir#bar" --refresh

# Updating the flake should not change the lockfile.
nix flake lock "$flake2Dir"
[[ -z $(git -C "$flake2Dir" diff main || echo failed) ]]

# Now we should be able to build the flake in pure mode.
nix build -o "$TEST_ROOT/result" flake2#bar

# Or without a registry.
nix build -o "$TEST_ROOT/result" --no-registries "git+file://$percentEncodedFlake2Dir#bar" --refresh
nix build -o "$TEST_ROOT/result" --no-use-registries "git+file://$percentEncodedFlake2Dir#bar" --refresh

# Test whether indirect dependencies work.
nix build -o "$TEST_ROOT/result" "$flake3Dir#xyzzy"
git -C "$flake3Dir" add flake.lock

# Add dependency to flake3.
rm "$flake3Dir/flake.nix"

cat > "$flake3Dir/flake.nix" <<EOF
{
  description = "Fnord";

  outputs = { self, flake1, flake2 }: rec {
    packages.$system.xyzzy = flake2.packages.$system.bar;
    packages.$system."sth sth" = flake1.packages.$system.foo;
  };
}
EOF

git -C "$flake3Dir" add flake.nix
git -C "$flake3Dir" commit -m 'Update flake.nix'

# Check whether `nix build` works with an incomplete lockfile
nix build -o $TEST_ROOT/result "$flake3Dir#sth sth"
nix build -o $TEST_ROOT/result "$flake3Dir#sth%20sth"

# Check whether it saved the lockfile
[[ -n $(git -C "$flake3Dir" diff master) ]]

git -C "$flake3Dir" add flake.lock

git -C "$flake3Dir" commit -m 'Add lockfile'

# Test whether registry caching works.
nix registry list --flake-registry "file://$registry" | grepQuiet flake3
mv "$registry" "$registry.tmp"
nix store gc
nix registry list --flake-registry "file://$registry" --refresh | grepQuiet flake3
mv "$registry.tmp" "$registry"

# Test whether flakes are registered as GC roots for offline use.
# FIXME: use tarballs rather than git.
rm -rf "$TEST_HOME/.cache"
nix store gc # get rid of copies in the store to ensure they get fetched to our git cache
_NIX_FORCE_HTTP=1 nix build -o "$TEST_ROOT/result" "git+file://$percentEncodedFlake2Dir#bar"
mv "$flake1Dir" "$flake1Dir.tmp"
mv "$flake2Dir" "$flake2Dir.tmp"
nix store gc
_NIX_FORCE_HTTP=1 nix build -o "$TEST_ROOT/result" "git+file://$percentEncodedFlake2Dir#bar"
_NIX_FORCE_HTTP=1 nix build -o "$TEST_ROOT/result" "git+file://$percentEncodedFlake2Dir#bar" --refresh
mv "$flake1Dir.tmp" "$flake1Dir"
mv "$flake2Dir.tmp" "$flake2Dir"

# Add nonFlakeInputs to flake3.
rm "$flake3Dir/flake.nix"

cat > "$flake3Dir/flake.nix" <<EOF
{
  inputs = {
    flake1 = {};
    flake2 = {};
    nonFlake = {
      url = git+file://$nonFlakeDir;
      flake = false;
    };
    nonFlakeFile = {
      url = path://$nonFlakeDir/README.md;
      flake = false;
    };
    nonFlakeFile2 = {
      url = "$nonFlakeDir/README.md";
      flake = false;
    };
  };

  description = "Fnord";

  outputs = inputs: rec {
    packages.$system.xyzzy = inputs.flake2.packages.$system.bar;
    packages.$system.sth = inputs.flake1.packages.$system.foo;
    packages.$system.fnord =
      with import ./config.nix;
      mkDerivation {
        inherit system;
        name = "fnord";
        dummy = builtins.readFile (builtins.path { name = "source"; path = ./.; filter = path: type: baseNameOf path == "config.nix"; } + "/config.nix");
        dummy2 = builtins.readFile (builtins.path { name = "source"; path = inputs.flake1; filter = path: type: baseNameOf path == "simple.nix"; } + "/simple.nix");
        buildCommand = ''
          cat \${inputs.nonFlake}/README.md > \$out
          [[ \$(cat \${inputs.nonFlake}/README.md) = \$(cat \${inputs.nonFlakeFile}) ]]
          [[ \${inputs.nonFlakeFile} = \${inputs.nonFlakeFile2} ]]
        '';
      };
  };
}
EOF

cp ../config.nix "$flake3Dir"

git -C "$flake3Dir" add flake.nix config.nix
git -C "$flake3Dir" commit -m 'Add nonFlakeInputs'

# Check whether `nix build` works with a lockfile which is missing a
# nonFlakeInputs.
nix build -o "$TEST_ROOT/result" "$flake3Dir#sth" --commit-lock-file

nix build -o "$TEST_ROOT/result" flake3#fnord
[[ $(cat $TEST_ROOT/result) = FNORD ]]

# Check whether flake input fetching is lazy: flake3#sth does not
# depend on flake2, so this shouldn't fail.
rm -rf "$TEST_HOME/.cache"
clearStore
mv "$flake2Dir" "$flake2Dir.tmp"
mv "$nonFlakeDir" "$nonFlakeDir.tmp"
nix build -o "$TEST_ROOT/result" flake3#sth
(! nix build -o "$TEST_ROOT/result" flake3#xyzzy)
(! nix build -o "$TEST_ROOT/result" flake3#fnord)
mv "$flake2Dir.tmp" "$flake2Dir"
mv "$nonFlakeDir.tmp" "$nonFlakeDir"
nix build -o "$TEST_ROOT/result" flake3#xyzzy flake3#fnord

# Test doing multiple `lookupFlake`s
nix build -o "$TEST_ROOT/result" flake4#xyzzy

# Test 'nix flake update' and --override-flake.
nix flake lock "$flake3Dir"
[[ -z $(git -C "$flake3Dir" diff master || echo failed) ]]

nix flake update --flake "$flake3Dir" --override-flake flake2 nixpkgs
[[ ! -z $(git -C "$flake3Dir" diff master || echo failed) ]]

# Make branch "removeXyzzy" where flake3 doesn't have xyzzy anymore
git -C "$flake3Dir" checkout -b removeXyzzy
rm "$flake3Dir/flake.nix"

cat > "$flake3Dir/flake.nix" <<EOF
{
  inputs = {
    nonFlake = {
      url = "$nonFlakeDir";
      flake = false;
    };
  };

  description = "Fnord";

  outputs = { self, flake1, flake2, nonFlake }: rec {
    packages.$system.sth = flake1.packages.$system.foo;
    packages.$system.fnord =
      with import ./config.nix;
      mkDerivation {
        inherit system;
        name = "fnord";
        buildCommand = ''
          cat \${nonFlake}/README.md > \$out
        '';
      };
  };
}
EOF
nix flake lock "$flake3Dir"
git -C "$flake3Dir" add flake.nix flake.lock
git -C "$flake3Dir" commit -m 'Remove packages.xyzzy'
git -C "$flake3Dir" checkout master

# Test whether fuzzy-matching works for registry entries.
(! nix build -o "$TEST_ROOT/result" flake4/removeXyzzy#xyzzy)
nix build -o "$TEST_ROOT/result" flake4/removeXyzzy#sth

# Testing the nix CLI
nix registry add flake1 flake3
[[ $(nix registry list | wc -l) == 6 ]]
nix registry pin flake1
[[ $(nix registry list | wc -l) == 6 ]]
nix registry pin flake1 flake3
[[ $(nix registry list | wc -l) == 6 ]]
nix registry remove flake1
[[ $(nix registry list | wc -l) == 5 ]]

# Test 'nix registry list' with a disabled global registry.
nix registry add user-flake1 git+file://$flake1Dir
nix registry add user-flake2 "git+file://$percentEncodedFlake2Dir"
[[ $(nix --flake-registry "" registry list | wc -l) == 2 ]]
nix --flake-registry "" registry list | grepQuietInverse '^global' # nothing in global registry
nix --flake-registry "" registry list | grepQuiet '^user'
nix registry remove user-flake1
nix registry remove user-flake2
[[ $(nix registry list | wc -l) == 5 ]]

# Test 'nix flake clone'.
rm -rf $TEST_ROOT/flake1-v2
nix flake clone flake1 --dest $TEST_ROOT/flake1-v2
[ -e $TEST_ROOT/flake1-v2/flake.nix ]

# Test 'follows' inputs.
cat > "$flake3Dir/flake.nix" <<EOF
{
  inputs.foo = {
    type = "indirect";
    id = "flake1";
  };
  inputs.bar.follows = "foo";

  outputs = { self, foo, bar }: {
  };
}
EOF

nix flake lock "$flake3Dir"
[[ $(jq -c .nodes.root.inputs.bar "$flake3Dir/flake.lock") = '["foo"]' ]]

cat > "$flake3Dir/flake.nix" <<EOF
{
  inputs.bar.follows = "flake2/flake1";

  outputs = { self, flake2, bar }: {
  };
}
EOF

nix flake lock "$flake3Dir"
[[ $(jq -c .nodes.root.inputs.bar "$flake3Dir/flake.lock") = '["flake2","flake1"]' ]]

cat > "$flake3Dir/flake.nix" <<EOF
{
  inputs.bar.follows = "flake2";

  outputs = { self, flake2, bar }: {
  };
}
EOF

nix flake lock "$flake3Dir"
[[ $(jq -c .nodes.root.inputs.bar "$flake3Dir/flake.lock") = '["flake2"]' ]]

# Test overriding inputs of inputs.
writeTrivialFlake $flake7Dir
git -C $flake7Dir add flake.nix
git -C $flake7Dir commit -m 'Initial'

cat > "$flake3Dir/flake.nix" <<EOF
{
  inputs.flake2.inputs.flake1 = {
    type = "git";
    url = file://$flake7Dir;
  };

  outputs = { self, flake2 }: {
  };
}
EOF

nix flake lock "$flake3Dir"
[[ $(jq .nodes.flake1.locked.url "$flake3Dir/flake.lock") =~ flake7 ]]

cat > "$flake3Dir/flake.nix" <<EOF
{
  inputs.flake2.inputs.flake1.follows = "foo";
  inputs.foo.url = git+file://$flake7Dir;

  outputs = { self, flake2 }: {
  };
}
EOF

nix flake update --flake "$flake3Dir"
[[ $(jq -c .nodes.flake2.inputs.flake1 "$flake3Dir/flake.lock") =~ '["foo"]' ]]
[[ $(jq .nodes.foo.locked.url "$flake3Dir/flake.lock") =~ flake7 ]]

# Test git+file with bare repo.
rm -rf $flakeGitBare
git clone --bare $flake1Dir $flakeGitBare
nix build -o $TEST_ROOT/result git+file://$flakeGitBare

# Test path flakes.
mkdir -p $flake5Dir
writeDependentFlake $flake5Dir
nix flake lock path://$flake5Dir

# Test tarball flakes.
tar cfz $TEST_ROOT/flake.tar.gz -C $TEST_ROOT flake5

nix build -o $TEST_ROOT/result file://$TEST_ROOT/flake.tar.gz

# Building with a tarball URL containing a SRI hash should also work.
url=$(nix flake metadata --json file://$TEST_ROOT/flake.tar.gz | jq -r .url)
[[ $url =~ sha256- ]]

nix build -o $TEST_ROOT/result $url

# Building with an incorrect SRI hash should fail.
expectStderr 102 nix build -o $TEST_ROOT/result "file://$TEST_ROOT/flake.tar.gz?narHash=sha256-qQ2Zz4DNHViCUrp6gTS7EE4+RMqFQtUfWF2UNUtJKS0=" | grep 'NAR hash mismatch'

# Test --override-input.
git -C "$flake3Dir" reset --hard
nix flake lock "$flake3Dir" --override-input flake2/flake1 file://$TEST_ROOT/flake.tar.gz -vvvvv
[[ $(jq .nodes.flake1_2.locked.url "$flake3Dir/flake.lock") =~ flake.tar.gz ]]

nix flake lock "$flake3Dir" --override-input flake2/flake1 flake1
[[ $(jq -r .nodes.flake1_2.locked.rev "$flake3Dir/flake.lock") =~ $hash2 ]]

nix flake lock "$flake3Dir" --override-input flake2/flake1 flake1/master/$hash1
[[ $(jq -r .nodes.flake1_2.locked.rev "$flake3Dir/flake.lock") =~ $hash1 ]]

# Test --update-input.
nix flake lock "$flake3Dir"
[[ $(jq -r .nodes.flake1_2.locked.rev "$flake3Dir/flake.lock") = $hash1 ]]

nix flake update flake2/flake1 --flake "$flake3Dir"
[[ $(jq -r .nodes.flake1_2.locked.rev "$flake3Dir/flake.lock") =~ $hash2 ]]

# Test 'nix flake metadata --json'.
nix flake metadata "$flake3Dir" --json | jq .

# Test flake in store does not evaluate.
rm -rf $badFlakeDir
mkdir $badFlakeDir
echo INVALID > $badFlakeDir/flake.nix
nix store delete $(nix store add-path $badFlakeDir)

[[ $(nix path-info      $(nix store add-path $flake1Dir)) =~ flake1 ]]
[[ $(nix path-info path:$(nix store add-path $flake1Dir)) =~ simple ]]

# Test fetching flakerefs in the legacy CLI.
[[ $(nix-instantiate --eval flake:flake3 -A x) = 123 ]]
[[ $(nix-instantiate --eval "flake:git+file://$percentEncodedFlake3Dir" -A x) = 123 ]]
[[ $(nix-instantiate -I flake3=flake:flake3 --eval '<flake3>' -A x) = 123 ]]
[[ $(NIX_PATH=flake3=flake:flake3 nix-instantiate --eval '<flake3>' -A x) = 123 ]]

# Test alternate lockfile paths.
nix flake lock "$flake2Dir" --output-lock-file $TEST_ROOT/flake2.lock
cmp "$flake2Dir/flake.lock" $TEST_ROOT/flake2.lock >/dev/null # lockfiles should be identical, since we're referencing flake2's original one

nix flake lock "$flake2Dir" --output-lock-file $TEST_ROOT/flake2-overridden.lock --override-input flake1 git+file://$flake1Dir?rev=$flake1OriginalCommit
expectStderr 1 cmp "$flake2Dir/flake.lock" $TEST_ROOT/flake2-overridden.lock
nix flake metadata "$flake2Dir" --reference-lock-file $TEST_ROOT/flake2-overridden.lock | grepQuiet $flake1OriginalCommit

# reference-lock-file can only be used if allow-dirty is set.
expectStderr 1 nix flake metadata "$flake2Dir" --no-allow-dirty --reference-lock-file $TEST_ROOT/flake2-overridden.lock

# Test shebang
[[ $($nonFlakeDir/shebang.sh) = "foo" ]]
[[ $($nonFlakeDir/shebang.sh "bar") = "foo"$'\n'"bar" ]]
[[ $($nonFlakeDir/shebang-comments.sh ) = "foo" ]]
[[ $($nonFlakeDir/shebang-inline-expr.sh baz) = "foo"$'\n'"baz" ]]
[[ $($nonFlakeDir/shebang-file.sh baz) = "foo"$'\n'"baz" ]]
expect 1 $nonFlakeDir/shebang-reject.sh 2>&1 | grepQuiet -F 'error: unsupported unquoted character in nix shebang: *. Use double backticks to escape?'