zig fetch --save localpath generates url+hash instead of just path

[timfayz]

Zig Version

0.12.0-dev.2307+1b8f7e46f

Steps to Reproduce and Observed Behavior

lib/build.zig.zon

.{
    .name = "lib",
    .version = "0.1.0",
    .paths = .{""},
}

lib/build.zig

const std = @import("std");

pub fn build(b: *std.Build) void {
    _ = b.addModule("lib", .{
        .root_source_file = .{ .path = "lib.zig" },
    });
}

lib/lib.zig

pub fn get_number() usize {
    return 42;
}

_

app/build.zig.zon

.{
    .name = "app",
    .version = "0.1.0",
    .paths = .{""},
}

app/build.zig

const std = @import("std");

pub fn build(b: *std.Build) !void {
    const exe = b.addExecutable(.{
        .name = "main",
        .root_source_file = .{ .path = "main.zig" },
        .target = b.host,
    });

    const lib_mod = b.dependency("lib", .{}).module("lib");
    exe.root_module.addImport("lib", lib_mod);
    b.installArtifact(exe);
}

app/main.zig

const lib = @import("lib");

pub fn main() !void {
    @import("std").log.debug("{d}", .{lib.get_number()});
}

app and lib share the same parent folder.

Running:

$ cd app
$ zig fetch --save ../lib

Results in:

.{
    .name = "app",
    .version = "0.1.0",
    // new
    .dependencies = .{
        .lib = .{
            .url = "../lib",
            .hash = "1220773b828b56e62e7e70238b4213e99e8b7e4f8ccec8a70e1404bdfe4886bb0adf",
        },
    },
    .paths = .{""},
}

Running zig build thereafter produces an error:

thread 7278714 panic: unable to find module 'lib'
/Users/timfayz/.zig/lib/std/debug.zig:434:22: 0x1021314a3 in panicExtra__anon_14927 (build)
    std.builtin.panic(msg, trace, ret_addr);
                     ^
/Users/timfayz/.zig/lib/std/debug.zig:409:15: 0x102105477 in panic__anon_13700 (build)
    panicExtra(null, null, format, args);
              ^
/Users/timfayz/.zig/lib/std/Build.zig:1730:18: 0x1020c8af7 in module (build)
            panic("unable to find module '{s}'", .{name});
                 ^
/Users/timfayz/dev/test/fetchZonLocally/app/build.zig:4:52: 0x1020c86a7 in build (build)
    const lib_mod = b.dependency("lib", .{}).module("lib");
                                                   ^
/Users/timfayz/.zig/lib/std/Build.zig:1885:43: 0x1020b42fb in runBuild__anon_8021 (build)
        .ErrorUnion => try build_zig.build(b),
                                          ^
/Users/timfayz/.zig/lib/build_runner.zig:319:29: 0x1020af913 in main (build)
        try builder.runBuild(root);
                            ^
/Users/timfayz/.zig/lib/std/start.zig:585:37: 0x1020b4733 in main (build)
            const result = root.main() catch |err| {
                                    ^
???:?:?: 0x10245d0f3 in ??? (???)
???:?:?: 0xc9677fffffffffff in ??? (???)
error: the following build command crashed:
/Users/timfayz/dev/test/fetchZonLocally/app/zig-cache/o/eb64301265b7ff0d532a4f9e65583421/build /Users/timfayz/.zig/zig /Users/timfayz/dev/test/fetchZonLocally/app /Users/timfayz/dev/test/fetchZonLocally/app/zig-cache /Users/timfayz/.cache/zig --seed 0x5be323c9

Expected Behavior

I believe zig fetch --save ../lib should be aware of the filesystem level and generate the following instead:

    ...
    .dependencies = .{
        .lib = .{
            .path = "../lib",
        },
    },
    ...
}

Changing .url to .path and removing .hash fix the error.