Man Pages

snap


NAME
SYNOPSIS
DESCRIPTION
OPTIONS
COMMANDS

NAME

snap − Tool to interact with snaps

SYNOPSIS

snap [OPTIONS]

DESCRIPTION

Install, configure, refresh and remove snap packages. Snaps are enabling secure distribution of the latest apps and utilities for cloud, servers, desktops and the internet of things.

This is the CLI for snapd, a background service that takes care of snaps on the system. Start with ’snap list’ to see installed snaps.

OPTIONS

Application Options

COMMANDS

abort
Abort a pending change

The abort command attempts to abort a change that still has pending tasks.

Usage: snap [OPTIONS] abort [abort-OPTIONS]

−−last

Select last change of given type (install, refresh, remove, try, auto-refresh etc.)

ack
Add an assertion to the system

The ack command tries to add an assertion to the system assertion database.

The assertion may also be a newer revision of a pre-existing assertion that it will replace.

To succeed the assertion must be valid, its signature verified with a known public key and the assertion consistent with and its prerequisite in the database.

alias
Set up a manual alias

The alias command aliases the given snap application to the given alias.

Once this manual alias is setup the respective application command can be invoked just using the alias.

Usage: snap [OPTIONS] alias [alias-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

aliases
List aliases in the system

The aliases command lists all aliases available in the system and their status.

$ snap aliases <snap>

Lists only the aliases defined by the specified snap.

An alias noted as undefined means it was explicitly enabled or disabled but is not defined in the current revision of the snap, possibly temporarily (e.g. because of a revert). This can cleared with ’snap alias --reset’.

buy
Buy a snap

The buy command buys a snap from the store.

changes
List system changes

The changes command displays a summary of system changes performed recently.

Usage: snap [OPTIONS] changes [changes-OPTIONS]

−−abs-time

Display absolute times (in RFC 3339 format). Otherwise, display relative times up to 60 days, then YYYY-MM-DD.

connect
Connect a plug to a slot

The connect command connects a plug to a slot. It may be called in the following ways:

$ snap connect <snap>:<plug> <snap>:<slot>

Connects the provided plug to the given slot.

$ snap connect <snap>:<plug> <snap>

Connects the specific plug to the only slot in the provided snap that matches the connected interface. If more than one potential slot exists, the command fails.

$ snap connect <snap>:<plug>

Connects the provided plug to the slot in the core snap with a name matching the plug name.

Usage: snap [OPTIONS] connect [connect-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

disable
Disable a snap in the system

The disable command disables a snap. The binaries and services of the snap will no longer be available, but all the data is still available and the snap can easily be enabled again.

Usage: snap [OPTIONS] disable [disable-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

disconnect
Disconnect a plug from a slot

The disconnect command disconnects a plug from a slot. It may be called in the following ways:

$ snap disconnect <snap>:<plug> <snap>:<slot>

Disconnects the specific plug from the specific slot.

$ snap disconnect <snap>:<slot or plug>

Disconnects everything from the provided plug or slot. The snap name may be omitted for the core snap.

Usage: snap [OPTIONS] disconnect [disconnect-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

download
Download the given snap

The download command downloads the given snap and its supporting assertions to the current directory with .snap and .assert file extensions, respectively.

Usage: snap [OPTIONS] download [download-OPTIONS]

−−channel

Use this channel instead of stable

−−edge

Install from the edge channel

−−beta

Install from the beta channel

−−candidate

Install from the candidate channel

−−stable

Install from the stable channel

−−revision

Download the given revision of a snap, to which you must have developer access

enable
Enable a snap in the system

The enable command enables a snap that was previously disabled.

Usage: snap [OPTIONS] enable [enable-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

find
Find packages to install

The find command queries the store for available packages in the stable channel.

With the --private flag, which requires the user to be logged-in to the store (see ’snap help login’), it instead searches for private snaps that the user has developer access to, either directly or through the store’s collaboration feature.

Usage: snap [OPTIONS] find [find-OPTIONS]

Aliases: search
−−private

Search private snaps

−−narrow

Only search for snaps in “stable”

−−section [="show-all-sections-please"] <default:
"no-section-specified"
>

Restrict the search to a given section

get
Print configuration options

The get command prints configuration options for the provided snap.

$ snap get snap-name username
frank

If multiple option names are provided, a document is returned:

$ snap get snap-name username password
{
"username": "frank",
"password": "..."
}

Nested values may be retrieved via a dotted path:

$ snap get snap-name author.name
frank

Usage: snap [OPTIONS] get [get-OPTIONS]

−t

Strict typing with nulls and quoted strings

−d

Always return document, even with single key

−l

Always return list, even with single key

help
Show help about a command

The help command displays information about snap commands.

Usage: snap [OPTIONS] help [help-OPTIONS]

info
Show detailed information about snaps

The info command shows detailed information about snaps.

The snaps can be specified by name or by path; names are looked for both in the store and in the installed snaps; paths can refer to a .snap file, or to a directory that contains an unpacked snap suitable for ’snap try’ (an example of this would be the ’prime’ directory snapcraft produces).

Usage: snap [OPTIONS] info [info-OPTIONS]

−−abs-time

Display absolute times (in RFC 3339 format). Otherwise, display relative times up to 60 days, then YYYY-MM-DD.

−−verbose

Include more details on the snap (expanded notes, base, etc.)

install
Install a snap to the system

The install command installs the named snaps in the system.

With no further options, the snaps are installed tracking the stable channel, with strict security confinement.

Revision choice via the --revision override requires the the user to have developer access to the snap, either directly or through the store’s collaboration feature, and to be logged in (see ’snap help login’).

Note a later refresh will typically undo a revision override, taking the snap back to the current revision of the channel it’s tracking.

Usage: snap [OPTIONS] install [install-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

−−channel

Use this channel instead of stable

−−edge

Install from the edge channel

−−beta

Install from the beta channel

−−candidate

Install from the candidate channel

−−stable

Install from the stable channel

−−devmode

Put snap in development mode and disable security confinement

−−jailmode

Put snap in enforced confinement mode

−−classic

Put snap in classic mode and disable security confinement

−−revision

Install the given revision of a snap, to which you must have developer access

−−dangerous

Install the given snap file even if there are no pre-acknowledged signatures for it, meaning it was not verified and could be dangerous (--devmode implies this)

−−unaliased

Install the given snap without enabling its automatic aliases

interface
List snap interfaces

The interface command shows details of snap interfaces.

If no interface name is provided, a list of interface names with at least one connection is shown, or a list of all interfaces if --all is provided.

Usage: snap [OPTIONS] interface [interface-OPTIONS]

−−attrs

Show interface attributes

−−all

Include unused interfaces

interfaces
List interfaces in the system

The interfaces command lists interfaces available in the system.

By default all slots and plugs, used and offered by all snaps, are displayed.

$ snap interfaces <snap>:<slot or plug>

Lists only the specified slot or plug.

$ snap interfaces <snap>

Lists the slots offered and plugs used by the specified snap.

$ snap interfaces -i=<interface> [<snap>]

Filters the complete output so only plugs and/or slots matching the provided details are listed.

Usage: snap [OPTIONS] interfaces [interfaces-OPTIONS]

−i

Constrain listing to specific interfaces

known
Show known assertions of the provided type

The known command shows known assertions of the provided type. If header=value pairs are provided after the assertion type, the assertions shown must also have the specified headers matching the provided values.

Usage: snap [OPTIONS] known [known-OPTIONS]

−−remote

list
List installed snaps

The list command displays a summary of snaps installed in the current system.

Usage: snap [OPTIONS] list [list-OPTIONS]

−−all

Show all revisions

login
Authenticate to snapd and the store

The login command authenticates the user to snapd and the snap store, and saves credentials into the ~/.snap/auth.json file. Further communication with snapd will then be made using those credentials.

It’s not necessary to log in to interact with snapd. Doing so, however, enables purchasing of snaps using ’snap buy’, as well as some some developer-oriented features as detailed in the help for the find, install and refresh commands.

An account can be set up at https://login.ubuntu.com

logout
Log out of snapd and the store

The logout command logs the current user out of snapd and the store.

logs
Retrieve logs of services

The logs command fetches logs of the given services and displays them in chronological order.

Usage: snap [OPTIONS] logs [logs-OPTIONS]

−n <default: "10">

Show only the given number of lines, or ’all’.

−f

Wait for new lines and print them as they come in.

pack
Pack the given directory as a snap

The pack command packs the given snap-dir as a snap and writes the result to target-dir. If target-dir is omitted, the result is written to current directory. If both source-dir and target-dir are omitted, the pack command packs the current directory.

When used with --check-skeleton, pack only checks whether snap-dir contains valid snap metadata and raises an error otherwise. Application commands listed in snap metadata file, but appearing with incorrect permission bits result in an error. Commands that are missing from snap-dir are listed in diagnostic messages.

Usage: snap [OPTIONS] pack [pack-OPTIONS]

−−check-skeleton

Validate snap-dir metadata only

prefer
Prefer aliases from a snap and disable conflicts

The prefer command enables all aliases of the given snap in preference to conflicting aliases of other snaps whose aliases will be disabled (or removed, for manual ones).

Usage: snap [OPTIONS] prefer [prefer-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

refresh
Refresh a snap in the system

The refresh command updates the specified snaps, or all snaps in the system if none are specified.

With no further options, the snaps are refreshed to the current revision of the channel they’re tracking, preserving their confinement options.

Revision choice via the --revision override requires the the user to have developer access to the snap, either directly or through the store’s collaboration feature, and to be logged in (see ’snap help login’).

Note a later refresh will typically undo a revision override.

Usage: snap [OPTIONS] refresh [refresh-OPTIONS]

−−abs-time

Display absolute times (in RFC 3339 format). Otherwise, display relative times up to 60 days, then YYYY-MM-DD.

−−no-wait

Do not wait for the operation to finish but just print the change id.

−−channel

Use this channel instead of stable

−−edge

Install from the edge channel

−−beta

Install from the beta channel

−−candidate

Install from the candidate channel

−−stable

Install from the stable channel

−−devmode

Put snap in development mode and disable security confinement

−−jailmode

Put snap in enforced confinement mode

−−classic

Put snap in classic mode and disable security confinement

−−amend

Allow refresh attempt on snap unknown to the store

−−revision

Refresh to the given revision, to which you must have developer access

−−list

Show available snaps for refresh but do not perform a refresh

−−time

Show auto refresh information but do not perform a refresh

−−ignore-validation

Ignore validation by other snaps blocking the refresh

remove
Remove a snap from the system

The remove command removes the named snap from the system.

By default all the snap revisions are removed, including their data and the common data directory. When a --revision option is passed only the specified revision is removed.

Usage: snap [OPTIONS] remove [remove-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

−−revision

Remove only the given revision

restart
Restart services

The restart command restarts the given services.

If the --reload option is given, for each service whose app has a reload command, a reload is performed instead of a restart.

Usage: snap [OPTIONS] restart [restart-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

−−reload

If the service has a reload command, use it instead of restarting.

revert
Reverts the given snap to the previous state

The revert command reverts the given snap to its state before the latest refresh. This will reactivate the previous snap revision, and will use the original data that was associated with that revision, discarding any data changes that were done by the latest revision. As an exception, data which the snap explicitly chooses to share across revisions is not touched by the revert process.

Usage: snap [OPTIONS] revert [revert-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

−−devmode

Put snap in development mode and disable security confinement

−−jailmode

Put snap in enforced confinement mode

−−classic

Put snap in classic mode and disable security confinement

−−revision

Revert to the given revision

run
Run the given snap command

The run command executes the given snap command with the right confinement and environment.

Usage: snap [OPTIONS] run [run-OPTIONS]

−−shell

Run a shell instead of the command (useful for debugging)

−−strace [="with-strace"] <default: "no-strace">

Run the command under strace (useful for debugging). Extra strace options can be specified as well here. Pass --raw to strace early snap helpers.

−−gdb

Run the command with gdb

services
Query the status of services

The services command lists information about the services specified, or about the services in all currently installed snaps.

set
Change configuration options

The set command changes the provided configuration options as requested.

$ snap set snap-name username=frank password=$PASSWORD

All configuration changes are persisted at once, and only after the snap’s configuration hook returns successfully.

Nested values may be modified via a dotted path:

$ snap set author.name=frank

Usage: snap [OPTIONS] set [set-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

start
Start services

The start command starts, and optionally enables, the given services.

Usage: snap [OPTIONS] start [start-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

−−enable

As well as starting the service now, arrange for it to be started on boot.

stop
Stop services

The stop command stops, and optionally disables, the given services.

Usage: snap [OPTIONS] stop [stop-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

−−disable

As well as stopping the service now, arrange for it to no longer be started on boot.

switch
Switches snap to a different channel

The switch command switches the given snap to a different channel without doing a refresh.

Usage: snap [OPTIONS] switch [switch-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

−−channel

Use this channel instead of stable

−−edge

Install from the edge channel

−−beta

Install from the beta channel

−−candidate

Install from the candidate channel

−−stable

Install from the stable channel

tasks
List a change’s tasks

The tasks command displays a summary of tasks associated with an individual change.

Usage: snap [OPTIONS] tasks [tasks-OPTIONS]

Aliases: change
−−abs-time

Display absolute times (in RFC 3339 format). Otherwise, display relative times up to 60 days, then YYYY-MM-DD.

−−last

Select last change of given type (install, refresh, remove, try, auto-refresh etc.)

try
Test a snap in the system

The try command installs an unpacked snap into the system for testing purposes. The unpacked snap content continues to be used even after installation, so non-metadata changes there go live instantly. Metadata changes such as those performed in snap.yaml will require reinstallation to go live.

If snap-dir argument is omitted, the try command will attempt to infer it if either snapcraft.yaml file and prime directory or meta/snap.yaml file can be found relative to current working directory.

Usage: snap [OPTIONS] try [try-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

−−devmode

Put snap in development mode and disable security confinement

−−jailmode

Put snap in enforced confinement mode

−−classic

Put snap in classic mode and disable security confinement

unalias
Unalias a manual alias or an entire snap

The unalias command removes a single alias if the provided argument is a manual alias, or disables all aliases of a snap, including manual ones, if the argument is a snap name.

Usage: snap [OPTIONS] unalias [unalias-OPTIONS]

−−no-wait

Do not wait for the operation to finish but just print the change id.

version
Show version details

The version command displays the versions of the running client, server, and operating system.

wait
Wait for configuration

The wait command waits until a configration becomes true.

watch
Watch a change in progress

The watch command waits for the given change-id to finish and shows progress (if available).

Usage: snap [OPTIONS] watch [watch-OPTIONS]

−−last

Select last change of given type (install, refresh, remove, try, auto-refresh etc.)

whoami
Print the email the user is logged in with

The whoami command prints the email the user is logged in with.

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