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gen: stale provider signatures when passing multiple packages in one invocation #14

Description

@Satont

Running into a weird caching issue on v1.2.0 (from go.mod, github.com/goforj/wire v1.2.0).

Setup: monorepo with go.work, each app has its own cmd package with an injector. Wire runs via go tool github.com/goforj/wire/cmd/wire gen <targets> from another module in the workspace.

I refactored a bunch of providers — changed constructor signatures and deleted an options struct they used to take. Regenerating with multiple targets in one call:

wire gen ../libs/baseapp ../apps/eventsub/cmd

writes a wire_gen.go that still calls the OLD signatures (references the deleted struct, does not compile). Sometimes it even prints "unchanged" for a file that obviously cannot be current.

The exact same command with a single target:

wire gen ../apps/eventsub/cmd

produces correct output. Deleting the existing wire_gen.go first also forces correct output. This is 100% reproducible in my repo: every multi-target run was stale, every single-target run was correct. WIRE_CACHE_MODE=content also made the multi-target run produce correct output (though that might just be because the mode is part of the cache key, so it was a guaranteed miss).

Suspect the persistent cache in ~/.cache/wire (default mtime mode). Looking at outputCacheKey, non-local packages contribute only their ExportFile path to the key — maybe in the multi-package path some packages end up treated as non-local and their stale analysis gets reused?

Versions: wire v1.2.0, go1.26.3 linux/amd64, go.work workspace.

Workaround for now: generate each package in its own process, plus WIRE_CACHE_MODE=content.

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