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// Copyright 2021 Canonical Ltd.
// Licensed under the LGPLv3 with static-linking exception.
// See LICENCE file for details.
package linux
import (
"errors"
"fmt"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
)
// ataRE matches an ATA path component, capturing the ATA print ID.
var ataRE = regexp.MustCompile(`^ata([[:digit:]]+)$`)
type ataParams struct {
printId uint32
port uint32
*scsiParams
}
func handleATAPath(path string) (*ataParams, error) {
components := strings.Split(path, string(os.PathSeparator))
if len(components) < 6 {
return nil, errors.New("invalid path: insufficient components")
}
ata := components[len(components)-6]
m := ataRE.FindStringSubmatch(ata)
if len(m) == 0 {
return nil, fmt.Errorf("invalid path component: %s", ata)
}
scsiParams, err := handleSCSIPath(path)
if err != nil {
return nil, err
}
printId, err := strconv.ParseUint(m[1], 10, 32)
if err != nil {
return nil, fmt.Errorf("invalid print ID: %w", err)
}
// Obtain the ATA port number local to this ATA controller. The kernel
// creates one ata%d device per port (see drivers/ata/libata-core.c:ata_host_register).
portBytes, err := os.ReadFile(filepath.Join(path, "../../../../..", "ata_port", ata, "port_no"))
if err != nil {
return nil, fmt.Errorf("cannot obtain port ID: %w", err)
}
port, err := strconv.ParseUint(strings.TrimSpace(string(portBytes)), 10, 16)
if err != nil {
return nil, fmt.Errorf("invalid port ID: %w", err)
}
return &ataParams{
printId: uint32(printId),
port: uint32(port),
scsiParams: scsiParams}, nil
}
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