snapstate

package
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 Go to latest Published: Jun 11, 2021 License: GPL-3.0 Imports: 54 Imported by: 0

Documentation

Overview

Package snapstate implements the manager and state aspects responsible for the installation and removal of snaps.

Index

Constants

View Source 
const (
	IgnoreHookError = 1 << iota
	TrackHookError
	UseConfigDefaults
)

control flags for "Configure()"

View Source 
const (
	DownloadAndChecksDoneEdge = state.TaskSetEdge("download-and-checks-done")
	BeginEdge                 = state.TaskSetEdge("begin")
	BeforeHooksEdge           = state.TaskSetEdge("before-hooks")
	HooksEdge                 = state.TaskSetEdge("hooks")
)

Variables

View Source 
var (
	CanAutoRefresh        func(st *state.State) (bool, error)
	CanManageRefreshes    func(st *state.State) bool
	IsOnMeteredConnection func() (bool, error)
)

hooks setup by devicestate

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var AutoAliases func(st *state.State, info *snap.Info) (map[string]string, error)

AutoAliases allows to hook support for retrieving the automatic aliases of a snap.

View Source 
var AutoRefreshAssertions func(st *state.State, userID int) error

AutoRefreshAssertions allows to hook fetching of important assertions into the Autorefresh function.

View Source 
var AutomaticSnapshot func(st *state.State, instanceName string) (ts *state.TaskSet, err error)

AutomaticSnapshot allows to hook snapshot manager's AutomaticSnapshot.

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var AutomaticSnapshotExpiration func(st *state.State) (time.Duration, error)
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var CheckHealthHook = func(st *state.State, snapName string, rev snap.Revision) *state.Task {
	panic("internal error: snapstate.CheckHealthHook is unset")
}
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var Configure = func(st *state.State, snapName string, patch map[string]interface{}, flags int) *state.TaskSet {
	panic("internal error: snapstate.Configure is unset")
}
View Source 
var (
	DeviceCtx func(st *state.State, task *state.Task, providedDeviceCtx DeviceContext) (DeviceContext, error)
)

Hook setup by devicestate to pick a device context from state, optional task or an optionally pre-provided one. It's expected to return ErrNoState if a model assertion is not yet known.

View Source 
var EnsureSnapAbsentFromQuotaGroup = func(st *state.State, snap string) error {
	panic("internal error: snapstate.EnsureSnapAbsentFromQuotaGroup is unset")
}
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var ErrMissingExpectedResult = fmt.Errorf("unexpectedly empty response from the server (try again later)")
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var ErrNoCurrent = errors.New("snap has no current revision")
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var ErrNothingToDo = errors.New("nothing to do")
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var EstimateSnapshotSize func(st *state.State, instanceName string, users []string) (uint64, error)
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var FinalTasks = []string{"mark-seeded", "set-model"}

FinalTasks are task kinds for final tasks in a change which means no further change work should be performed afterward, usually these are tasks that commit a full system transition.

View Source 
var PolicyFor func(snap.Type, *asserts.Model) Policy = policyForUnset
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var (
	Remodeling func(st *state.State) bool
)

Hook setup by devicestate to know whether a remodeling is in progress.

View Source 
var SecurityProfilesRemoveLate = func(snapName string, rev snap.Revision, typ snap.Type) error {
	panic("internal error: snapstate.SecurityProfilesRemoveLate is unset")
}
View Source 
var SetupGateAutoRefreshHook = func(st *state.State, snapName string, base, restart bool) *state.Task {
	panic("internal error: snapstate.SetupAutoRefreshGatingHook is unset")
}
View Source 
var SetupInstallHook = func(st *state.State, snapName string) *state.Task {
	panic("internal error: snapstate.SetupInstallHook is unset")
}
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var SetupPostRefreshHook = func(st *state.State, snapName string) *state.Task {
	panic("internal error: snapstate.SetupPostRefreshHook is unset")
}
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var SetupPreRefreshHook = func(st *state.State, snapName string) *state.Task {
	panic("internal error: snapstate.SetupPreRefreshHook is unset")
}
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var SetupRemoveHook = func(st *state.State, snapName string) *state.Task {
	panic("internal error: snapstate.SetupRemoveHook is unset")
}
View Source 
var SnapServiceOptions = func(st *state.State, instanceName string, grps map[string]*quota.Group) (opts *wrappers.SnapServiceOptions, err error) {
	panic("internal error: snapstate.SnapServiceOptions is unset")
}

SnapServiceOptions is a hook set by servicestate.

View Source 
var ValidateRefreshes func(st *state.State, refreshes []*snap.Info, ignoreValidation map[string]bool, userID int, deviceCtx DeviceContext) (validated []*snap.Info, err error)

ValidateRefreshes allows to hook validation into the handling of refresh candidates.

Functions

func ActiveInfos 

func ActiveInfos(st *state.State) ([]*snap.Info, error)

ActiveInfos returns information about all active snaps.

func AddAffectedSnapsByAttr 

func AddAffectedSnapsByAttr(attr string, f AffectedSnapsFunc)

AddAffectedSnapsByAttrs registers an AffectedSnapsFunc for returning the affected snaps for tasks sporting the given identifying attribute, to use in conflicts detection.

func AddAffectedSnapsByKind 

func AddAffectedSnapsByKind(kind string, f AffectedSnapsFunc)

AddAffectedSnapsByKind registers an AffectedSnapsFunc for returning the affected snaps for tasks of the given kind, to use in conflicts detection. Whenever possible using AddAffectedSnapsByAttr should be preferred.

func AddCheckSnapCallback 

func AddCheckSnapCallback(check CheckSnapCallback)

AddCheckSnapCallback installs a callback to check a snap for installation or refresh.

func AddLinkSnapParticipant 

func AddLinkSnapParticipant(p LinkSnapParticipant)

AddLinkSnapParticipant adds a participant in the link/unlink operations.

func Alias 

func Alias(st *state.State, instanceName, app, alias string) (*state.TaskSet, error)

Alias sets up a manual alias from alias to app in snapName.

func All 

func All(st *state.State) (map[string]*SnapState, error)

All retrieves return a map from name to SnapState for all current snaps in the system state.

func AutoRefresh 

func AutoRefresh(ctx context.Context, st *state.State) ([]string, []*state.TaskSet, error)

AutoRefresh is the wrapper that will do a refresh of all the installed snaps on the system. In addition to that it will also refresh important assertions.

func BootBaseInfo 

func BootBaseInfo(st *state.State, deviceCtx DeviceContext) (*snap.Info, error)

BootBaseInfo finds the boot base snap's info for the given device context.

func CheckChangeConflict 

func CheckChangeConflict(st *state.State, instanceName string, snapst *SnapState) error

CheckChangeConflict ensures that for the given instanceName no other changes that alters the snap (like remove, install, refresh) are in progress. It also ensures that snapst (if not nil) did not get modified. If a conflict is detected an error is returned.

func CheckChangeConflictMany 

func CheckChangeConflictMany(st *state.State, instanceNames []string, ignoreChangeID string) error

CheckChangeConflictMany ensures that for the given instanceNames no other changes that alters the snaps (like remove, install, refresh) are in progress. If a conflict is detected an error is returned.

It's like CheckChangeConflict, but for multiple snaps, and does not check snapst.

func CheckChangeConflictRunExclusively 

func CheckChangeConflictRunExclusively(st *state.State, newChangeKind string) error

CheckChangeConflictRunExclusively checks for conflicts with a new change which must be run when no other changes are running.

func ConfigDefaults 

func ConfigDefaults(st *state.State, deviceCtx DeviceContext, snapName string) (map[string]interface{}, error)

ConfigDefaults returns the configuration defaults for the snap as specified in the gadget for the given device context. If gadget is absent or the snap has no snap-id it returns ErrNoState.

func ConfigureSnap 

func ConfigureSnap(st *state.State, snapName string, confFlags int) *state.TaskSet

ConfigureSnap returns a set of tasks to configure snapName as done during installation/refresh.

func CurrentInfo 

func CurrentInfo(st *state.State, name string) (*snap.Info, error)

CurrentInfo returns the information about the current revision of a snap with the given name.

func Disable 

func Disable(st *state.State, name string) (*state.TaskSet, error)

Disable sets a snap to the inactive state

func DisableAllAliases 

func DisableAllAliases(st *state.State, instanceName string) (*state.TaskSet, error)

DisableAllAliases disables all aliases of a snap, removing all manual ones.

func Enable 

func Enable(st *state.State, name string) (*state.TaskSet, error)

Enable sets a snap to the active state

func FinishRestart 

func FinishRestart(task *state.Task, snapsup *SnapSetup) (err error)

FinishRestart will return a Retry error if there is a pending restart and a real error if anything went wrong (like a rollback across restarts). For snapd snap updates this will also rerun wrappers generation to fully catch up with any change.

func GadgetConnections 

func GadgetConnections(st *state.State, deviceCtx DeviceContext) ([]gadget.Connection, error)

GadgetConnections returns the interface connection instructions specified in the gadget for the given device context. If gadget is absent it returns ErrNoState.

func GadgetInfo 

func GadgetInfo(st *state.State, deviceCtx DeviceContext) (*snap.Info, error)

GadgetInfo finds the gadget snap's info for the given device context.

func Get 

func Get(st *state.State, name string, snapst *SnapState) error

Get retrieves the SnapState of the given snap.

func HardNothingRunningRefreshCheck 

func HardNothingRunningRefreshCheck(info *snap.Info) error

HardNothingRunningRefreshCheck looks if there are any undesired processes alive.

The check is designed to run late in the refresh pipeline, after stopping snap services. At this point non-enduring services should be stopped, hooks should no longer run, and applications should be barred from running externally (e.g. by using a new inhibition mechanism for snap run).

The check fails if any process belonging to the snap, apart from services that are enduring refresh, is still alive. If a snap is busy it cannot be refreshed and the refresh process is aborted.

func HasSnapOfType 

func HasSnapOfType(st *state.State, snapType snap.Type) (bool, error)

func HoldRefresh 

func HoldRefresh(st *state.State, gatingSnap string, holdDuration time.Duration, affectingSnaps ...string) error

HoldRefresh marks affectingSnaps as held for refresh for up to holdTime. HoldTime of zero denotes maximum allowed hold time. Holding may fail for only some snaps in which case HoldError is returned and it contains the details of failed ones.

func Info 

func Info(st *state.State, name string, revision snap.Revision) (*snap.Info, error)

Info returns the information about the snap with given name and revision. Works also for a mounted candidate snap in the process of being installed.

func InjectAutoConnect 

func InjectAutoConnect(mainTask *state.Task, snapsup *SnapSetup)

func InjectTasks 

func InjectTasks(mainTask *state.Task, extraTasks *state.TaskSet)

InjectTasks makes all the halt tasks of the mainTask wait for extraTasks; extraTasks join the same lane and change as the mainTask.

func Install 

func Install(ctx context.Context, st *state.State, name string, opts *RevisionOptions, userID int, flags Flags) (*state.TaskSet, error)

Install returns a set of tasks for installing a snap. Note that the state must be locked by the caller.

The returned TaskSet will contain a DownloadAndChecksDoneEdge.

func InstallMany 

func InstallMany(st *state.State, names []string, userID int) ([]string, []*state.TaskSet, error)

InstallMany installs everything from the given list of names. Note that the state must be locked by the caller.

func InstallPath 

func InstallPath(st *state.State, si *snap.SideInfo, path, instanceName, channel string, flags Flags) (*state.TaskSet, *snap.Info, error)

InstallPath returns a set of tasks for installing a snap from a file path and the snap.Info for the given snap.

Note that the state must be locked by the caller. The provided SideInfo can contain just a name which results in a local revision and sideloading, or full metadata in which case it the snap will appear as installed from the store.

func InstallWithDeviceContext 

func InstallWithDeviceContext(ctx context.Context, st *state.State, name string, opts *RevisionOptions, userID int, flags Flags, deviceCtx DeviceContext, fromChange string) (*state.TaskSet, error)

InstallWithDeviceContext returns a set of tasks for installing a snap. It will query for the snap with the given deviceCtx. Note that the state must be locked by the caller.

The returned TaskSet will contain a DownloadAndChecksDoneEdge.

func Installing 

func Installing(st *state.State) bool

Installing returns whether there's an in-progress installation.

func KernelInfo 

func KernelInfo(st *state.State, deviceCtx DeviceContext) (*snap.Info, error)

KernelInfo finds the kernel snap's info for the given device context.

func LinkNewBaseOrKernel 

func LinkNewBaseOrKernel(st *state.State, name string) (*state.TaskSet, error)

LinkNewBaseOrKernel will create prepare/link-snap tasks for a remodel

func MockCheckSnapCallbacks 

func MockCheckSnapCallbacks(checks []CheckSnapCallback) (restore func())

func MockLinkSnapParticipants 

func MockLinkSnapParticipants(ps []LinkSnapParticipant) (restore func())

MockLinkSnapParticipants replaces the list of link snap participants for testing.

func MockOsutilCheckFreeSpace 

func MockOsutilCheckFreeSpace(mock func(path string, minSize uint64) error) (restore func())

func MockRefreshCandidate 

func MockRefreshCandidate(snapSetup *SnapSetup, version string) interface{}

for testing outside of snapstate

func ModelFromTask 

func ModelFromTask(task *state.Task) (*asserts.Model, error)

ModelFromTask returns a model assertion through the device context for the task.

func NewTaskProgressAdapterLocked 

func NewTaskProgressAdapterLocked(t *state.Task) progress.Meter

NewTaskProgressAdapterUnlocked creates an adapter of the task into a progress.Meter to use while the state is locked

func NewTaskProgressAdapterUnlocked 

func NewTaskProgressAdapterUnlocked(t *state.Task) progress.Meter

NewTaskProgressAdapterUnlocked creates an adapter of the task into a progress.Meter to use while the state is unlocked

func NumSnaps 

func NumSnaps(st *state.State) (int, error)

NumSnaps returns the number of installed snaps.

func Prefer 

func Prefer(st *state.State, name string) (*state.TaskSet, error)

Prefer enables all aliases of a snap in preference to conflicting aliases of other snaps whose aliases will be disabled (removed for manual ones).

func ProceedWithRefresh 

func ProceedWithRefresh(st *state.State, gatingSnap string) error

ProceedWithRefresh unblocks all snaps held by gatingSnap for refresh. This should be called for --proceed on the gatingSnap.

func RefreshCandidates 

func RefreshCandidates(st *state.State, user *auth.UserState) ([]*snap.Info, error)

RefreshCandidates gets a list of candidates for update Note that the state must be locked by the caller.

func Remove 

func Remove(st *state.State, name string, revision snap.Revision, flags *RemoveFlags) (*state.TaskSet, error)

Remove returns a set of tasks for removing snap. Note that the state must be locked by the caller.

func RemoveManualAlias 

func RemoveManualAlias(st *state.State, alias string) (ts *state.TaskSet, instanceName string, err error)

RemoveManualAlias removes a manual alias.

func RemoveMany 

func RemoveMany(st *state.State, names []string) ([]string, []*state.TaskSet, error)

RemoveMany removes everything from the given list of names. Note that the state must be locked by the caller.

func ReplaceStore 

func ReplaceStore(state *state.State, store StoreService)

ReplaceStore replaces the store used by the manager.

func Revert 

func Revert(st *state.State, name string, flags Flags) (*state.TaskSet, error)

Revert returns a set of tasks for reverting to the previous version of the snap. Note that the state must be locked by the caller.

func RevertToRevision 

func RevertToRevision(st *state.State, name string, rev snap.Revision, flags Flags) (*state.TaskSet, error)

func Set 

func Set(st *state.State, name string, snapst *SnapState)

Set sets the SnapState of the given snap, overwriting any earlier state. Note that a SnapState with an empty Sequence will be treated as if snapst was nil and name will be deleted from the state.

func SetTaskSnapSetup 

func SetTaskSnapSetup(t *state.Task, snapsup *SnapSetup) error

SetTaskSnapSetup writes the given SnapSetup to the provided task's snap-setup-task Task, or to the task itself if the task does not have a snap-setup-task (i.e. it _is_ the snap-setup-task)

func SoftNothingRunningRefreshCheck 

func SoftNothingRunningRefreshCheck(info *snap.Info) error

SoftNothingRunningRefreshCheck looks if there are at most only service processes alive.

The check is designed to run early in the refresh pipeline. Before downloading or stopping services for the update, we can check that only services are running, that is, that no non-service apps or hooks are currently running.

Since services are stopped during the update this provides a good early precondition check. The check is also deliberately racy as existing snap commands can fork new processes or existing processes can die. After the soft check passes the user is free to start snap applications and block the hard check.

func Switch 

func Switch(st *state.State, name string, opts *RevisionOptions) (*state.TaskSet, error)

Switch switches a snap to a new channel and/or cohort

func TransitionCore 

func TransitionCore(st *state.State, oldName, newName string) ([]*state.TaskSet, error)

TransitionCore transitions from an old core snap name to a new core snap name. It is used for the ubuntu-core -> core transition (that is not just a rename because the two snaps have different snapIDs)

Note that this function makes some assumptions like: - no aliases setup for both snaps - no data needs to be copied - all interfaces are absolutely identical on both new and old Do not use this as a general way to transition from snap A to snap B.

func TryPath 

func TryPath(st *state.State, name, path string, flags Flags) (*state.TaskSet, error)

TryPath returns a set of tasks for trying a snap from a file path. Note that the state must be locked by the caller.

func Update 

func Update(st *state.State, name string, opts *RevisionOptions, userID int, flags Flags) (*state.TaskSet, error)

Update initiates a change updating a snap. Note that the state must be locked by the caller.

The returned TaskSet will contain a DownloadAndChecksDoneEdge.

func UpdateBootRevisions 

func UpdateBootRevisions(st *state.State) error

UpdateBootRevisions synchronizes the active kernel and OS snap versions with the versions that actually booted. This is needed because a system may install "os=v2" but that fails to boot. The bootloader fallback logic will revert to "os=v1" but on the filesystem snappy still has the "active" version set to "v2" which is misleading. This code will check what kernel/os booted and set those versions active.To do this it creates a Change and kicks start it directly.

func UpdateMany 

func UpdateMany(ctx context.Context, st *state.State, names []string, userID int, flags *Flags) ([]string, []*state.TaskSet, error)

UpdateMany updates everything from the given list of names that the store says is updateable. If the list is empty, update everything. Note that the state must be locked by the caller.

func UpdateWithDeviceContext 

func UpdateWithDeviceContext(st *state.State, name string, opts *RevisionOptions, userID int, flags Flags, deviceCtx DeviceContext, fromChange string) (*state.TaskSet, error)

UpdateWithDeviceContext initiates a change updating a snap. It will query for the snap with the given deviceCtx. Note that the state must be locked by the caller.

The returned TaskSet will contain a DownloadAndChecksDoneEdge.

Types

type AffectedSnapsFunc 

type AffectedSnapsFunc func(*state.Task) ([]string, error)

An AffectedSnapsFunc returns a list of affected snap names for the given supported task.

type AliasConflictError 

type AliasConflictError struct {
	Snap      string
	Alias     string
	Reason    string
	Conflicts map[string][]string
}

func (*AliasConflictError) Error 

func (e *AliasConflictError) Error() string

type AliasTarget 

type AliasTarget struct {
	Manual string `json:"manual,omitempty"`
	Auto   string `json:"auto,omitempty"`
}

AliasTarget carries the targets of an alias in the context of snap. If Manual is set it is the target of an enabled manual alias. Auto is set to the target for an automatic alias, enabled or disabled depending on the automatic aliases flag state.

func (*AliasTarget) Effective 

func (at *AliasTarget) Effective(autoDisabled bool) string

Effective returns the target to use considering whether automatic aliases are disabled for the whole snap (autoDisabled), returns "" if the alias is disabled.

type BusySnapError 

type BusySnapError struct {
	SnapInfo *snap.Info
	// contains filtered or unexported fields
}

BusySnapError indicates that snap has apps or hooks running and cannot refresh.

func (*BusySnapError) Error 

func (err *BusySnapError) Error() string

Error formats an error string describing what is running.

func (*BusySnapError) PendingSnapRefreshInfo 

func (err *BusySnapError) PendingSnapRefreshInfo() *userclient.PendingSnapRefreshInfo

PendingSnapRefreshInfo computes information necessary to perform user notification of postponed refresh of a snap, based on the information about snap "business".

The returned value contains the instance name of the snap as well as, if possible, information relevant for desktop notification services, such as application name and the snapd-generated desktop file name.

func (BusySnapError) Pids 

func (err BusySnapError) Pids() []int

Pids returns the set of process identifiers that are running.

Since this list is a snapshot it should be only acted upon if there is an external synchronization system applied (e.g. all processes are frozen) at the time the snapshot was taken.

The list is intended for snapd to forcefully kill all processes for a forced refresh scenario.

type ChangeConflictError 

type ChangeConflictError struct {
	Snap       string
	ChangeKind string
	// a Message is optional, otherwise one is composed from the other information
	Message string
}

ChangeConflictError represents an error because of snap conflicts between changes.

func (*ChangeConflictError) Error 

func (e *ChangeConflictError) Error() string

type CheckSnapCallback 

type CheckSnapCallback func(st *state.State, snap, curSnap *snap.Info, snapf snap.Container, flags Flags, deviceCtx DeviceContext) error

CheckSnapCallback defines callbacks for checking a snap for installation or refresh.

type DeviceContext 

type DeviceContext interface {
	// GroundContext returns a context corresponding to the
	// original model of the device for a remodel, or a context
	// equivalent to this one otherwise, except in both cases
	// Store cannot be used and must panic.
	GroundContext() DeviceContext

	// Store returns the store service to use under this context or nil if the snapstate store is appropriate.
	Store() StoreService

	// ForRemodeling returns whether this context is for use over a remodeling.
	ForRemodeling() bool

	// SystemMode returns the system  mode (run,install,recover,...).
	SystemMode() string

	// DeviceContext should be usable as boot.Device
	boot.Device
}

A DeviceContext provides for operating as a given device and with its brand store either for normal operation or over a remodeling.

func DeviceCtxFromState 

func DeviceCtxFromState(st *state.State, providedDeviceCtx DeviceContext) (DeviceContext, error)

DeviceCtxFromState returns a device context if a model assertion is available. Otherwise it returns a ChangeConflictError about being too early unless an pre-provided DeviceContext is passed in.

func DevicePastSeeding 

func DevicePastSeeding(st *state.State, providedDeviceCtx DeviceContext) (DeviceContext, error)

DevicePastSeeding returns a device context if a model assertion is available and the device is seeded, at that point the device store is known and seeding done. Otherwise it returns a ChangeConflictError about being too early unless a pre-provided DeviceContext is passed in. It will again return a conflict error during remodeling unless the providedDeviceCtx is for it.

type Flags 

type Flags struct {
	// DevMode switches confinement to non-enforcing mode.
	DevMode bool `json:"devmode,omitempty"`
	// JailMode is set when the user has requested confinement
	// always be enforcing, even if the snap requests otherwise.
	JailMode bool `json:"jailmode,omitempty"`
	// Classic is set when the user has consented to install a snap with
	// classic confinement and the snap declares that confinement.
	Classic bool `json:"classic,omitempty"`
	// TryMode is set for snaps installed to try directly from a local directory.
	TryMode bool `json:"trymode,omitempty"`

	// Revert flags the SnapSetup as coming from a revert
	Revert bool `json:"revert,omitempty"`

	// RemoveSnapPath is used via InstallPath to flag that the file passed in is
	// temporary and should be removed
	RemoveSnapPath bool `json:"remove-snap-path,omitempty"`

	// IgnoreValidation is set when the user requested as one-off
	// to ignore refresh control validation.
	IgnoreValidation bool `json:"ignore-validation,omitempty"`

	// IgnoreRunning is set to indicate that running apps or hooks should be
	// ignored.
	IgnoreRunning bool `json:"ignore-running,omitempty"`

	// Required is set to mark that a snap is required
	// and cannot be removed
	Required bool `json:"required,omitempty"`

	// SkipConfigure is used with InstallPath to flag that creating a task
	// running the configure hook should be skipped.
	SkipConfigure bool `json:"skip-configure,omitempty"`

	// Unaliased is set to request that no automatic aliases are created
	// installing the snap.
	Unaliased bool `json:"unaliased,omitempty"`

	// Amend allows refreshing out of a snap unknown to the store
	// and into one that is known.
	Amend bool `json:"amend,omitempty"`

	// IsAutoRefresh is true if the snap is currently auto-refreshed
	IsAutoRefresh bool `json:"is-auto-refresh,omitempty"`

	// NoReRefresh prevents refresh from adding epoch-hopping
	// re-refresh tasks. This allows refresh to work offline, as
	// long as refresh assets are cached.
	NoReRefresh bool `json:"no-rerefresh,omitempty"`

	// RequireTypeBase is set to mark that a snap needs to be of type: base,
	// otherwise installation fails.
	RequireTypeBase bool `json:"require-base-type,omitempty"`

	// ApplySnapDevMode overrides allowing a snap to be installed if it is in
	// devmode confinement. This is set to true for currently only UC20 model
	// grades dangerous for all snaps during first boot, where we always allow
	// devmode snaps to be installed, and installed with devmode confinement
	// turned on.
	// This may eventually be set for specific snaps mentioned in the model
	// assertion for non-dangerous grade models too.
	ApplySnapDevMode bool `json:"apply-snap-devmode,omitempty"`
}

Flags are used to pass additional flags to operations and to keep track of snap modes.

func (Flags) DevModeAllowed 

func (f Flags) DevModeAllowed() bool

DevModeAllowed returns whether a snap can be installed with devmode confinement (either set or overridden).

func (Flags) ForSnapSetup 

func (f Flags) ForSnapSetup() Flags

ForSnapSetup returns a copy of the Flags with the flags that we don't need in SnapSetup set to false (so they're not serialized).

type HoldDurationError 

type HoldDurationError struct {
	Err          error
	DurationLeft time.Duration
}

HoldDurationError contains the that error prevents requested hold, along with hold time that's left (if any).

func (*HoldDurationError) Error 

func (h *HoldDurationError) Error() string

type HoldError 

type HoldError struct {
	SnapsInError map[string]HoldDurationError
}

HoldError contains the details of snaps that cannot to be held.

func (*HoldError) Error 

func (h *HoldError) Error() string

type InsufficientSpaceError 

type InsufficientSpaceError struct {
	// Path is the filesystem path checked for available disk space
	Path string
	// Snaps affected by the failing operation
	Snaps []string
	// Kind of the change that failed
	ChangeKind string
	// Message is optional, otherwise one is composed from the other information
	Message string
}

InsufficientSpaceError represents an error where there is not enough disk space to perform an operation.

func (*InsufficientSpaceError) Error 

func (e *InsufficientSpaceError) Error() string

type LinkSnapParticipant 

type LinkSnapParticipant interface {
	// SnapLinkageChanged is called when a snap is linked or unlinked.
	// The error is only logged and does not stop the task it is used from.
	SnapLinkageChanged(st *state.State, instanceName string) error
}

LinkSnapParticipant is an interface for interacting with snap link/unlink operations.

Unlike the interface for a task handler, only one notification method is used. The method notifies a participant that linkage of a snap has changed. This method is invoked in link-snap, unlink-snap, the undo path of those methods and the undo handler for link-snap.

In all cases it is invoked after all other operations are completed but before the task completes.

type Policy 

type Policy interface {
	// CanRemove verifies that a snap can be removed.
	// If rev is not unset, check for removing only that revision.
	CanRemove(st *state.State, snapst *SnapState, rev snap.Revision, dev boot.Device) error
}

Policy encapsulates behaviour that varies with the details of a snap installation, like the model assertion or the type of snap involved in an operation. Rather than have a forest of `if`s looking at type, model, etc, we move it to Policy and look it up.

type RemoveFlags 

type RemoveFlags struct {
	// Remove the snap without creating snapshot data
	Purge bool
}

RemoveFlags are used to pass additional flags to the Remove operation.

type RevisionOptions 

type RevisionOptions struct {
	Channel     string
	Revision    snap.Revision
	CohortKey   string
	LeaveCohort bool
}

RevisionOptions control the selection of a snap revision.

type SnapManager 

type SnapManager struct {
	// contains filtered or unexported fields
}

SnapManager is responsible for the installation and removal of snaps.

func Manager 

func Manager(st *state.State, runner *state.TaskRunner) (*SnapManager, error)

Manager returns a new snap manager.

func (*SnapManager) CanStandby 

func (m *SnapManager) CanStandby() bool

func (*SnapManager) EffectiveRefreshHold 

func (m *SnapManager) EffectiveRefreshHold() (time.Time, error)

EffectiveRefreshHold returns the time until to which refreshes are held if refresh.hold configuration is set and accounting for the max postponement since the last refresh. The caller should be holding the state lock.

func (*SnapManager) Ensure 

func (m *SnapManager) Ensure() error

Ensure implements StateManager.Ensure.

func (*SnapManager) EnsureAutoRefreshesAreDelayed 

func (m *SnapManager) EnsureAutoRefreshesAreDelayed(delay time.Duration) ([]*state.Change, error)

EnsureAutoRefreshesAreDelayed will delay refreshes for the specified amount of time, as well as return any active auto-refresh changes that are currently not ready so that the client can wait for those.

func (*SnapManager) LastRefresh 

func (m *SnapManager) LastRefresh() (time.Time, error)

LastRefresh returns the time the last snap update. The caller should be holding the state lock.

func (*SnapManager) NextRefresh 

func (m *SnapManager) NextRefresh() time.Time

NextRefresh returns the time the next update of the system's snaps will be attempted. The caller should be holding the state lock.

func (*SnapManager) RefreshSchedule 

func (m *SnapManager) RefreshSchedule() (string, bool, error)

RefreshSchedule returns the current refresh schedule as a string suitable for display to a user and a flag indicating whether the schedule is a legacy one. The caller should be holding the state lock.

func (*SnapManager) StartUp 

func (m *SnapManager) StartUp() error

StartUp implements StateStarterUp.Startup.

func (*SnapManager) SyncCookies 

func (m *SnapManager) SyncCookies(st *state.State) error

SyncCookies creates snap cookies for snaps that are missing them (may be the case for snaps installed before the feature of running snapctl outside of hooks was introduced, leading to a warning from snap-confine). It is the caller's responsibility to lock state before calling this function.

type SnapNeedsClassicError 

type SnapNeedsClassicError struct {
	Snap string
}

func (*SnapNeedsClassicError) Error 

func (e *SnapNeedsClassicError) Error() string

type SnapNeedsClassicSystemError 

type SnapNeedsClassicSystemError struct {
	Snap string
}

func (*SnapNeedsClassicSystemError) Error 

func (e *SnapNeedsClassicSystemError) Error() string

type SnapNeedsDevModeError 

type SnapNeedsDevModeError struct {
	Snap string
}

func (*SnapNeedsDevModeError) Error 

func (e *SnapNeedsDevModeError) Error() string

type SnapNotClassicError 

type SnapNotClassicError struct {
	Snap string
}

func (*SnapNotClassicError) Error 

func (e *SnapNotClassicError) Error() string

type SnapSetup 

type SnapSetup struct {
	// FIXME: rename to RequestedChannel to convey the meaning better
	Channel string    `json:"channel,omitempty"`
	UserID  int       `json:"user-id,omitempty"`
	Base    string    `json:"base,omitempty"`
	Type    snap.Type `json:"type,omitempty"`
	// PlugsOnly indicates whether the relevant revisions for the
	// operation have only plugs (#plugs >= 0), and absolutely no
	// slots (#slots == 0).
	PlugsOnly bool `json:"plugs-only,omitempty"`

	CohortKey string `json:"cohort-key,omitempty"`

	// FIXME: implement rename of this as suggested in
	//  https://github.com/snapcore/snapd/pull/4103#discussion_r169569717
	//
	// Prereq is a list of snap-names that need to get installed
	// together with this snap. Typically used when installing
	// content-snaps with default-providers.
	Prereq []string `json:"prereq,omitempty"`

	Flags

	SnapPath string `json:"snap-path,omitempty"`

	DownloadInfo *snap.DownloadInfo `json:"download-info,omitempty"`
	SideInfo     *snap.SideInfo     `json:"side-info,omitempty"`

	// InstanceKey is set by the user during installation and differs for
	// each instance of given snap
	InstanceKey string `json:"instance-key,omitempty"`
	// contains filtered or unexported fields
}

SnapSetup holds the necessary snap details to perform most snap manager tasks.

func TaskSnapSetup 

func TaskSnapSetup(t *state.Task) (*SnapSetup, error)

TaskSnapSetup returns the SnapSetup with task params hold by or referred to by the task.

func (*SnapSetup) InstanceName 

func (snapsup *SnapSetup) InstanceName() string

func (*SnapSetup) MountDir 

func (snapsup *SnapSetup) MountDir() string

func (*SnapSetup) MountFile 

func (snapsup *SnapSetup) MountFile() string

func (*SnapSetup) Revision 

func (snapsup *SnapSetup) Revision() snap.Revision

func (*SnapSetup) SnapName 

func (snapsup *SnapSetup) SnapName() string

type SnapState 

type SnapState struct {
	SnapType string           `json:"type"` // Use Type and SetType
	Sequence []*snap.SideInfo `json:"sequence"`
	Active   bool             `json:"active,omitempty"`

	// LastActiveDisabledServices is a list of services that were disabled in
	// this snap when it was last active - i.e. when it was disabled, before
	// it was reverted, or before a refresh happens.
	// It is set during unlink-snap and unlink-current-snap and reset during
	// link-snap since it is only meant to be saved when snapd needs to remove
	// systemd units.
	// Note that to handle potential service renames, only services that exist
	// in the snap are removed from this list on link-snap, so that we can
	// remember services that were disabled in another revision and then renamed
	// or otherwise removed from the snap in a future refresh.
	LastActiveDisabledServices []string `json:"last-active-disabled-services,omitempty"`

	// tracking services enabled and disabled by hooks
	ServicesEnabledByHooks  []string `json:"services-enabled-by-hooks,omitempty"`
	ServicesDisabledByHooks []string `json:"services-disabled-by-hooks,omitempty"`

	// Current indicates the current active revision if Active is
	// true or the last active revision if Active is false
	// (usually while a snap is being operated on or disabled)
	Current         snap.Revision `json:"current"`
	TrackingChannel string        `json:"channel,omitempty"`
	Flags
	// aliases, see aliasesv2.go
	Aliases             map[string]*AliasTarget `json:"aliases,omitempty"`
	AutoAliasesDisabled bool                    `json:"auto-aliases-disabled,omitempty"`
	AliasesPending      bool                    `json:"aliases-pending,omitempty"`

	// UserID of the user requesting the install
	UserID int `json:"user-id,omitempty"`

	// InstanceKey is set by the user during installation and differs for
	// each instance of given snap
	InstanceKey string `json:"instance-key,omitempty"`
	CohortKey   string `json:"cohort-key,omitempty"`

	// RefreshInhibitedime records the time when the refresh was first
	// attempted but inhibited because the snap was busy. This value is
	// reset on each successful refresh.
	RefreshInhibitedTime *time.Time `json:"refresh-inhibited-time,omitempty"`

	// LastRefreshTime records the time when the snap was last refreshed.
	LastRefreshTime *time.Time `json:"last-refresh,omitempty"`
}

SnapState holds the state for a snap installed in the system.

func (*SnapState) Block 

func (snapst *SnapState) Block() []snap.Revision

Block returns revisions that should be blocked on refreshes, computed from Sequence[currentRevisionIndex+1:].

func (*SnapState) CurrentInfo 

func (snapst *SnapState) CurrentInfo() (*snap.Info, error)

CurrentInfo returns the information about the current active revision or the last active revision (if the snap is inactive). It returns the ErrNoCurrent error if snapst.Current is unset.

func (*SnapState) CurrentSideInfo 

func (snapst *SnapState) CurrentSideInfo() *snap.SideInfo

CurrentSideInfo returns the side info for the revision indicated by snapst.Current in the snap revision sequence if there is one.

func (*SnapState) InstanceName 

func (snapst *SnapState) InstanceName() string

func (*SnapState) IsInstalled 

func (snapst *SnapState) IsInstalled() bool

IsInstalled returns whether the snap is installed, i.e. snapst represents an installed snap with Current revision set.

func (*SnapState) LastIndex 

func (snapst *SnapState) LastIndex(revision snap.Revision) int

LastIndex returns the last index of the given revision in the snapst.Sequence

func (*SnapState) LocalRevision 

func (snapst *SnapState) LocalRevision() snap.Revision

LocalRevision returns the "latest" local revision. Local revisions start at -1 and are counted down.

func (*SnapState) SetTrackingChannel 

func (snapst *SnapState) SetTrackingChannel(s string) error

func (*SnapState) SetType 

func (snapst *SnapState) SetType(typ snap.Type)

SetType records the type of the snap.

func (*SnapState) Type 

func (snapst *SnapState) Type() (snap.Type, error)

Type returns the type of the snap or an error. Should never error if Current is not nil.

type StoreService 

type StoreService interface {
	EnsureDeviceSession() (*auth.DeviceState, error)

	SnapInfo(ctx context.Context, spec store.SnapSpec, user *auth.UserState) (*snap.Info, error)
	Find(ctx context.Context, search *store.Search, user *auth.UserState) ([]*snap.Info, error)

	SnapAction(ctx context.Context, currentSnaps []*store.CurrentSnap, actions []*store.SnapAction, assertQuery store.AssertionQuery, user *auth.UserState, opts *store.RefreshOptions) ([]store.SnapActionResult, []store.AssertionResult, error)

	Sections(ctx context.Context, user *auth.UserState) ([]string, error)
	WriteCatalogs(ctx context.Context, names io.Writer, adder store.SnapAdder) error

	Download(context.Context, string, string, *snap.DownloadInfo, progress.Meter, *auth.UserState, *store.DownloadOptions) error
	DownloadStream(context.Context, string, *snap.DownloadInfo, int64, *auth.UserState) (r io.ReadCloser, status int, err error)

	Assertion(assertType *asserts.AssertionType, primaryKey []string, user *auth.UserState) (asserts.Assertion, error)
	SeqFormingAssertion(assertType *asserts.AssertionType, sequenceKey []string, sequence int, user *auth.UserState) (asserts.Assertion, error)
	DownloadAssertions([]string, *asserts.Batch, *auth.UserState) error

	SuggestedCurrency() string
	Buy(options *client.BuyOptions, user *auth.UserState) (*client.BuyResult, error)
	ReadyToBuy(*auth.UserState) error
	ConnectivityCheck() (map[string]bool, error)
	CreateCohorts(context.Context, []string) (map[string]string, error)

	LoginUser(username, password, otp string) (string, string, error)
	UserInfo(email string) (userinfo *store.User, err error)
}

A StoreService can find, list available updates and download snaps.

func Store 

func Store(st *state.State, deviceCtx DeviceContext) StoreService

Store returns the store service provided by the optional device context or the one used by the snapstate package if the former has no override.

Source Files

View all Source files

Directories

Path Synopsis
Package backend implements the low-level primitives to manage the snaps and their installation on disk.
 Package backend implements the low-level primitives to manage the snaps and their installation on disk.
Package policy implements fine grained decision-making for snapstate
 Package policy implements fine grained decision-making for snapstate

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