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package main
import (
"context"
"fmt"
"os"
"path/filepath"
"github.com/datawire/dlib/dgroup"
"github.com/datawire/dlib/dlog"
"github.com/sirupsen/logrus"
"lukeshu.com/btrfs-tools/pkg/btrfs"
"lukeshu.com/btrfs-tools/pkg/btrfsmisc"
)
func main() {
ctx := context.Background()
logger := logrus.New()
logger.SetLevel(logrus.TraceLevel)
ctx = dlog.WithLogger(ctx, dlog.WrapLogrus(logger))
grp := dgroup.NewGroup(ctx, dgroup.GroupConfig{
EnableSignalHandling: true,
})
grp.Go("main", func(ctx context.Context) error {
return Main(ctx, os.Args[1], os.Args[2:]...)
})
if err := grp.Wait(); err != nil {
fmt.Fprintf(os.Stderr, "%v: error: %v\n", os.Args[0], err)
os.Exit(1)
}
}
func tryAbs(rel string) string {
abs, err := filepath.Abs(rel)
if err != nil {
return rel
}
return abs
}
func Main(ctx context.Context, mountpoint string, imgfilenames ...string) (err error) {
maybeSetErr := func(_err error) {
if _err != nil && err == nil {
err = _err
}
}
fs, err := btrfsmisc.Open(os.O_RDONLY, imgfilenames...)
if err != nil {
return err
}
defer func() {
maybeSetErr(fs.Close())
}()
rootSubvol := &Subvolume{
Subvolume: btrfs.Subvolume{
FS: fs,
TreeID: btrfs.FS_TREE_OBJECTID,
},
DeviceName: tryAbs(imgfilenames[0]),
Mountpoint: mountpoint,
}
return rootSubvol.Run(ctx)
}
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