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package main
import (
"context"
"net/http"
"os"
"path/filepath"
"testing"
"hakurei.app/check"
"hakurei.app/internal/pkg"
"hakurei.app/internal/rosa"
"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
attr pkg.CacheAttr
// Primarily to work around missing landlock LSM.
hostAbstract bool
// Set SCHED_IDLE.
idle bool
// Unset [pkg.CSuppressInit].
verboseInit bool
// Whether to enable output colours.
color bool
// Unset [pkg.CExternShallow].
deep bool
// Loaded artifact of [rosa.QEMU].
qemu pkg.Artifact
base, mirror string
}
// open opens the underlying [pkg.Cache].
func (cache *cache) open() (err error) {
if cache.c != nil {
return os.ErrInvalid
}
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
}
if cache.idle {
cache.attr.Flags |= pkg.CSchedIdle
}
if cache.hostAbstract {
cache.attr.Flags |= pkg.CHostAbstract
}
if !cache.verboseInit {
cache.attr.Flags |= pkg.CSuppressInit
}
if !cache.deep {
cache.attr.Flags |= pkg.CExternShallow
}
if cache.color {
cache.attr.Flags |= pkg.CColourOutput
}
done := make(chan struct{})
defer close(done)
go func() {
select {
case <-cache.ctx.Done():
if testing.Testing() {
return
}
os.Exit(2)
case <-done:
return
}
}()
cache.msg.Verbosef("opening cache at %s", base)
cache.c, err = pkg.Open(
cache.ctx,
cache.msg,
base,
&cache.attr,
)
if err != nil {
return
}
done <- struct{}{}
if cache.mirror != "" {
var pub []byte
pub, err = os.ReadFile(base.Append("ed25519.pub").String())
if err != nil {
cache.c.Close()
return
}
var r rosa.Remote
if r, err = rosa.NewRemote(http.DefaultClient, cache.mirror, pub); err != nil {
cache.c.Close()
return err
}
cache.c.SetExternal(r)
}
if cache.qemu != nil {
var pathname *check.Absolute
pathname, _, err = cache.c.Cure(cache.qemu)
if err != nil {
cache.c.Close()
return
}
for arch, entry := range rosa.Arches(pathname) {
pkg.RegisterArch(arch, entry)
}
}
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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