Hi,
The simple (wrong) command causes Juju 3.1.5 panic:
> juju show-task boo
panic: invalid action id "boo"
goroutine 1 [running]:
github.com/juju/names/v4.NewActionTag({0x7ffcf0bfe407, 0x3})
/build/snapcraft-juju-ed1204c3ada7643123d14744176eee1e/parts/juju/build/vendor/github.com/juju/names/v4/action.go:36 +0x125
github.com/juju/juju/api/client/action.(*Client).Actions(0xc000134820, {0xc00054be30, 0x1, 0x40?})
/build/snapcraft-juju-ed1204c3ada7643123d14744176eee1e/parts/juju/build/api/client/action/client.go:35 +0x94
github.com/juju/juju/cmd/juju/action.fetchResult({0x4ee9b70, 0xc000134820}, {0x7ffcf0bfe407, 0x3})
/build/snapcraft-juju-ed1204c3ada7643123d14744176eee1e/parts/juju/build/cmd/juju/action/common.go:486 +0xf3
github.com/juju/juju/cmd/juju/action.(*showTaskCommand).Run(0xc0005c0fc0, 0xc0001140c0)
/build/snapcraft-juju-ed1204c3ada7643123d14744176eee1e/parts/juju/build/cmd/juju/action/showtask.go:160 +0x4e5
github.com/juju/juju/cmd/modelcmd.(*modelCommandWrapper).Run(0xc0009e83f0, 0xc000bc6fa0?)
/build/snapcraft-juju-ed1204c3ada7643123d14744176eee1e/parts/juju/build/cmd/modelcmd/modelcommand.go:663 +0x123
github.com/juju/juju/cmd/modelcmd.(*baseCommandWrapper).Run(0xc00068b170, 0x400000005?)
/build/snapcraft-juju-ed1204c3ada7643123d14744176eee1e/parts/juju/build/cmd/modelcmd/base.go:554 +0xaf
github.com/juju/cmd/v3.(*SuperCommand).Run(0xc0009ed400, 0xc0001140c0)
/build/snapcraft-juju-ed1204c3ada7643123d14744176eee1e/parts/juju/build/vendor/github.com/juju/cmd/v3/supercommand.go:534 +0x378
github.com/juju/cmd/v3.Main({0x4edeeb8, 0xc0009ed400}, 0xc0001140c0, {0xc0007cb740, 0x2, 0x2})
/build/snapcraft-juju-ed1204c3ada7643123d14744176eee1e/parts/juju/build/vendor/github.com/juju/cmd/v3/cmd.go:419 +0x25d
github.com/juju/juju/cmd/juju/commands.jujuMain.Run({0xc0000e2140?}, {0xc0000720f0, 0x3, 0x3})
/build/snapcraft-juju-ed1204c3ada7643123d14744176eee1e/parts/juju/build/cmd/juju/commands/main.go:202 +0x8a5
github.com/juju/juju/cmd/juju/commands.Main(...)
/build/snapcraft-juju-ed1204c3ada7643123d14744176eee1e/parts/juju/build/cmd/juju/commands/main.go:125
main.main()
/build/snapcraft-juju-ed1204c3ada7643123d14744176eee1e/parts/juju/build/cmd/juju/main.go:27 +0x72
This bug is already fixed (see https:/ /github. com/juju/ juju/pull/ 15802), it will be delivered on juju 3.1.6