nix/tests/flakes/follow-paths.sh

source ./common.sh

requireGit

flakeFollowsA=$TEST_ROOT/follows/flakeA
flakeFollowsB=$TEST_ROOT/follows/flakeA/flakeB
flakeFollowsC=$TEST_ROOT/follows/flakeA/flakeB/flakeC
flakeFollowsD=$TEST_ROOT/follows/flakeA/flakeD
flakeFollowsE=$TEST_ROOT/follows/flakeA/flakeE

# Test following path flakerefs.
createGitRepo $flakeFollowsA
mkdir -p $flakeFollowsB
mkdir -p $flakeFollowsC
mkdir -p $flakeFollowsD
mkdir -p $flakeFollowsE

cat > $flakeFollowsA/flake.nix <<EOF
{
    description = "Flake A";
    inputs = {
        B = {
            url = "path:./flakeB";
            inputs.foobar.follows = "foobar";
        };

        foobar.url = "path:$flakeFollowsA/flakeE";
    };
    outputs = { ... }: {};
}
EOF

cat > $flakeFollowsB/flake.nix <<EOF
{
    description = "Flake B";
    inputs = {
        foobar.url = "path:$flakeFollowsA/flakeE";
        goodoo.follows = "C/goodoo";
        C = {
            url = "path:./flakeC";
            inputs.foobar.follows = "foobar";
        };
    };
    outputs = { ... }: {};
}
EOF

cat > $flakeFollowsC/flake.nix <<EOF
{
    description = "Flake C";
    inputs = {
        foobar.url = "path:$flakeFollowsA/flakeE";
        goodoo.follows = "foobar";
    };
    outputs = { ... }: {};
}
EOF

cat > $flakeFollowsD/flake.nix <<EOF
{
    description = "Flake D";
    inputs = {};
    outputs = { ... }: {};
}
EOF

cat > $flakeFollowsE/flake.nix <<EOF
{
    description = "Flake E";
    inputs = {};
    outputs = { ... }: {};
}
EOF

git -C $flakeFollowsA add flake.nix flakeB/flake.nix \
  flakeB/flakeC/flake.nix flakeD/flake.nix flakeE/flake.nix

nix flake metadata $flakeFollowsA

nix flake update $flakeFollowsA

nix flake lock $flakeFollowsA

oldLock="$(cat "$flakeFollowsA/flake.lock")"

# Ensure that locking twice doesn't change anything

nix flake lock $flakeFollowsA

newLock="$(cat "$flakeFollowsA/flake.lock")"

diff <(echo "$newLock") <(echo "$oldLock")

[[ $(jq -c .nodes.B.inputs.C $flakeFollowsA/flake.lock) = '"C"' ]]
[[ $(jq -c .nodes.B.inputs.foobar $flakeFollowsA/flake.lock) = '["foobar"]' ]]
[[ $(jq -c .nodes.C.inputs.foobar $flakeFollowsA/flake.lock) = '["B","foobar"]' ]]

# Ensure removing follows from flake.nix removes them from the lockfile

cat > $flakeFollowsA/flake.nix <<EOF
{
    description = "Flake A";
    inputs = {
        B = {
            url = "path:./flakeB";
        };
        D.url = "path:./flakeD";
    };
    outputs = { ... }: {};
}
EOF

nix flake lock $flakeFollowsA

[[ $(jq -c .nodes.B.inputs.foobar $flakeFollowsA/flake.lock) = '"foobar"' ]]
jq -r -c '.nodes | keys | .[]' $flakeFollowsA/flake.lock | grep "^foobar$"

# Ensure a relative path is not allowed to go outside the store path
cat > $flakeFollowsA/flake.nix <<EOF
{
    description = "Flake A";
    inputs = {
        B.url = "path:../flakeB";
    };
    outputs = { ... }: {};
}
EOF

git -C $flakeFollowsA add flake.nix

nix flake lock $flakeFollowsA 2>&1 | grep 'points outside'

# Non-existant follows should print a warning.
cat >$flakeFollowsA/flake.nix <<EOF
{
    description = "Flake A";
    inputs.B = {
        url = "path:./flakeB";
        inputs.invalid.follows = "D";
        inputs.invalid2.url = "path:./flakeD";
    };
    inputs.D.url = "path:./flakeD";
    outputs = { ... }: {};
}
EOF

git -C $flakeFollowsA add flake.nix

nix flake lock $flakeFollowsA 2>&1 | grep "warning: input 'B' has an override for a non-existent input 'invalid'"
nix flake lock $flakeFollowsA 2>&1 | grep "warning: input 'B' has an override for a non-existent input 'invalid2'"

# Test nested flake overrides: A overrides B/C/D

cat <<EOF > $flakeFollowsD/flake.nix
{ outputs = _: {}; }
EOF
cat <<EOF > $flakeFollowsC/flake.nix
{
  inputs.D.url = "path:nosuchflake";
  outputs = _: {};
}
EOF
cat <<EOF > $flakeFollowsB/flake.nix
{
  inputs.C.url = "path:$flakeFollowsC";
  outputs = _: {};
}
EOF
cat <<EOF > $flakeFollowsA/flake.nix
{
  inputs.B.url = "path:$flakeFollowsB";
  inputs.D.url = "path:$flakeFollowsD";
  inputs.B.inputs.C.inputs.D.follows = "D";
  outputs = _: {};
}
EOF

nix flake lock $flakeFollowsA

[[ $(jq -c .nodes.C.inputs.D $flakeFollowsA/flake.lock) = '["D"]' ]]

# Test overlapping flake follows: B has D follow C/D, while A has B/C follow C

cat <<EOF > $flakeFollowsC/flake.nix
{
  inputs.D.url = "path:$flakeFollowsD";
  outputs = _: {};
}
EOF
cat <<EOF > $flakeFollowsB/flake.nix
{
  inputs.C.url = "path:nosuchflake";
  inputs.D.url = "path:nosuchflake";
  inputs.D.follows = "C/D";
  outputs = _: {};
}
EOF
cat <<EOF > $flakeFollowsA/flake.nix
{
  inputs.B.url = "path:$flakeFollowsB";
  inputs.C.url = "path:$flakeFollowsC";
  inputs.B.inputs.C.follows = "C";
  outputs = _: {};
}
EOF

# bug was not triggered without recreating the lockfile
nix flake lock $flakeFollowsA --recreate-lock-file

[[ $(jq -c .nodes.B.inputs.D $flakeFollowsA/flake.lock) = '["B","C","D"]' ]]