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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2017 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package builtin
import (
"fmt"
"path/filepath"
"regexp"
"strings"
"github.com/snapcore/snapd/interfaces"
"github.com/snapcore/snapd/interfaces/apparmor"
"github.com/snapcore/snapd/interfaces/udev"
"github.com/snapcore/snapd/snap"
)
const spiSummary = `allows access to specific spi controller`
const spiBaseDeclarationSlots = `
spi:
allow-installation:
slot-snap-type:
- core
- gadget
deny-auto-connection: true
`
type spiInterface struct{}
func (iface *spiInterface) Name() string {
return "spi"
}
func (iface *spiInterface) StaticInfo() interfaces.StaticInfo {
return interfaces.StaticInfo{
Summary: spiSummary,
BaseDeclarationSlots: spiBaseDeclarationSlots,
}
}
var spiDevPattern = regexp.MustCompile(`^/dev/spidev[0-9]+\.[0-9]+$`)
func (iface *spiInterface) path(slotRef *interfaces.SlotRef, attrs interfaces.Attrer) (string, error) {
var path string
if err := attrs.Attr("path", &path); err != nil || path == "" {
return "", fmt.Errorf("slot %q must have a path attribute", slotRef)
}
// XXX: this interface feeds the cleaned path into the regex and is
// left unchanged here for historical reasons. New interfaces (eg,
// like raw-volume) should instead use verifySlotPathAttribute() which
// performs additional verification.
path = filepath.Clean(path)
if !spiDevPattern.MatchString(path) {
return "", fmt.Errorf("%q is not a valid SPI device", path)
}
return path, nil
}
func (iface *spiInterface) BeforePrepareSlot(slot *snap.SlotInfo) error {
_, err := iface.path(&interfaces.SlotRef{Snap: slot.Snap.InstanceName(), Name: slot.Name}, slot)
return err
}
func (iface *spiInterface) AppArmorConnectedPlug(spec *apparmor.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
path, err := iface.path(slot.Ref(), slot)
if err != nil {
return nil
}
spec.AddSnippet(fmt.Sprintf("%s rw,", path))
// Use parametric snippets to avoid parser slowdown.
spec.AddParametricSnippet([]string{
"/sys/devices/platform/**/**.spi/**/{spidev,spi}" /* ###PARAM### */, "/** rw, # Add any condensed parametric rules",
}, strings.TrimPrefix(path, "/dev/spidev"))
return nil
}
func (iface *spiInterface) UDevConnectedPlug(spec *udev.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
path, err := iface.path(slot.Ref(), slot)
if err != nil {
return nil
}
spec.TagDevice(fmt.Sprintf(`KERNEL=="%s"`, strings.TrimPrefix(path, "/dev/")))
return nil
}
func (iface *spiInterface) AutoConnect(*snap.PlugInfo, *snap.SlotInfo) bool {
// Allow what is allowed in the declarations
return true
}
func init() {
registerIface(&spiInterface{})
}
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