From 136bc0917be7c02b818bfc8d4d54ec8ffbc8d21b Mon Sep 17 00:00:00 2001
From: Ophestra <cat@gensokyo.uk>
Date: Thu, 16 Apr 2026 15:43:06 +0900
Subject: cmd/mbf: optionally open cache

Some commands do not require the cache. This change also makes acquisition of locked cache cancelable.

Signed-off-by: Ophestra <cat@gensokyo.uk>
---
 cmd/mbf/cache.go | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 cmd/mbf/cache.go

(limited to 'cmd/mbf/cache.go')

diff --git a/cmd/mbf/cache.go b/cmd/mbf/cache.go
new file mode 100644
index 00000000..16e77cbc
--- /dev/null
+++ b/cmd/mbf/cache.go
@@ -0,0 +1,90 @@
+package main
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+
+	"hakurei.app/check"
+	"hakurei.app/internal/pkg"
+	"hakurei.app/message"
+)
+
+// cache refers to an instance of [pkg.Cache] that might be open.
+type cache struct {
+	ctx context.Context
+	msg message.Msg
+
+	// Should generally not be used directly.
+	c *pkg.Cache
+
+	cures, jobs        int
+	hostAbstract, idle bool
+
+	base string
+}
+
+// open opens the underlying [pkg.Cache].
+func (cache *cache) open() (err error) {
+	if cache.c != nil {
+		return os.ErrInvalid
+	}
+
+	if cache.base == "" {
+		cache.base = "cache"
+	}
+	var base *check.Absolute
+	if cache.base, err = filepath.Abs(cache.base); err != nil {
+		return
+	} else if base, err = check.NewAbs(cache.base); err != nil {
+		return
+	}
+
+	var flags int
+	if cache.idle {
+		flags |= pkg.CSchedIdle
+	}
+	if cache.hostAbstract {
+		flags |= pkg.CHostAbstract
+	}
+
+	done := make(chan struct{})
+	defer close(done)
+	go func() {
+		select {
+		case <-cache.ctx.Done():
+			os.Exit(2)
+
+		case <-done:
+			return
+		}
+	}()
+
+	cache.msg.Verbosef("opening cache at %s", base)
+	cache.c, err = pkg.Open(
+		cache.ctx,
+		cache.msg,
+		flags,
+		cache.cures,
+		cache.jobs,
+		base,
+	)
+	return
+}
+
+// Close closes the underlying [pkg.Cache] if it is open.
+func (cache *cache) Close() {
+	if cache.c != nil {
+		cache.c.Close()
+	}
+}
+
+// Do calls f on the underlying cache and returns its error value.
+func (cache *cache) Do(f func(cache *pkg.Cache) error) error {
+	if cache.c == nil {
+		if err := cache.open(); err != nil {
+			return err
+		}
+	}
+	return f(cache.c)
+}
-- 
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