misc: Use go mod

Update package imports to reflect go-mod dependency versions.

Update to etcd/v3. etcd upstream versioning doesn't play well with Go
modules or newer versions of gRPC. v3.5.0 and newer follow Go semantic
versioning guidelines and resolves most versioning conflicts with
co-dependent libraries. There are many issues surrounding this, see [1].

Fix test-examples for Go Modules. Previously this test script symlinked
the examples source directory outside of the mgmt tree, but this doesn't
work with Go modules. Switch to building the example programs in-place,
and simplify the script to reduce the amount of superfluous operations.

Fixes a couple shellcheck warnings in test-examples too.

[1]: etcd-io/etcd#12124

Signed-off-by: Joe Groocock <me@frebib.net>

engine/resources/cron.go

@@ -33,10 +33,10 @@ import (
 	"github.com/purpleidea/mgmt/util"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	sdbus "github.com/coreos/go-systemd/dbus"
-	"github.com/coreos/go-systemd/unit"
-	systemdUtil "github.com/coreos/go-systemd/util"
-	"github.com/godbus/dbus"
+	sdbus "github.com/coreos/go-systemd/v22/dbus"
+	"github.com/coreos/go-systemd/v22/unit"
+	systemdUtil "github.com/coreos/go-systemd/v22/util"
+	"github.com/godbus/dbus/v5"
 )
 
 const (

engine/resources/hostname.go

@@ -27,7 +27,7 @@ import (
 	"github.com/purpleidea/mgmt/util"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	"github.com/godbus/dbus"
+	"github.com/godbus/dbus/v5"
 )
 
 func init() {

engine/resources/mount.go

@@ -35,11 +35,11 @@ import (
 	"github.com/purpleidea/mgmt/util"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	sdbus "github.com/coreos/go-systemd/dbus"
-	"github.com/coreos/go-systemd/unit"
-	systemdUtil "github.com/coreos/go-systemd/util"
+	sdbus "github.com/coreos/go-systemd/v22/dbus"
+	"github.com/coreos/go-systemd/v22/unit"
+	systemdUtil "github.com/coreos/go-systemd/v22/util"
 	fstab "github.com/deniswernert/go-fstab"
-	"github.com/godbus/dbus"
+	"github.com/godbus/dbus/v5"
 	"golang.org/x/sys/unix"
 )
 

engine/resources/msg.go

@@ -25,7 +25,7 @@ import (
 	"github.com/purpleidea/mgmt/engine"
 	"github.com/purpleidea/mgmt/engine/traits"
 
-	"github.com/coreos/go-systemd/journal"
+	"github.com/coreos/go-systemd/v22/journal"
 )
 
 func init() {

engine/resources/nspawn.go

@@ -30,10 +30,10 @@ import (
 	"github.com/purpleidea/mgmt/util"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	systemdDbus "github.com/coreos/go-systemd/dbus"
-	machined "github.com/coreos/go-systemd/machine1"
-	systemdUtil "github.com/coreos/go-systemd/util"
-	"github.com/godbus/dbus"
+	systemdDbus "github.com/coreos/go-systemd/v22/dbus"
+	machined "github.com/coreos/go-systemd/v22/machine1"
+	systemdUtil "github.com/coreos/go-systemd/v22/util"
+	"github.com/godbus/dbus/v5"
 )
 
 const (

engine/resources/packagekit/packagekit.go

@@ -29,7 +29,7 @@ import (
 	"github.com/purpleidea/mgmt/util"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	"github.com/godbus/dbus"
+	"github.com/godbus/dbus/v5"
 )
 
 // global tweaks of verbosity and code path

engine/resources/svc.go

@@ -30,9 +30,9 @@ import (
 	"github.com/purpleidea/mgmt/util"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	systemd "github.com/coreos/go-systemd/dbus" // change namespace
-	systemdUtil "github.com/coreos/go-systemd/util"
-	"github.com/godbus/dbus" // namespace collides with systemd wrapper
+	systemd "github.com/coreos/go-systemd/v22/dbus" // change namespace
+	systemdUtil "github.com/coreos/go-systemd/v22/util"
+	"github.com/godbus/dbus/v5" // namespace collides with systemd wrapper
 )
 
 func init() {

engine/util/util.go

@@ -33,7 +33,7 @@ import (
 	"github.com/purpleidea/mgmt/lang/types"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	"github.com/godbus/dbus"
+	"github.com/godbus/dbus/v5"
 )
 
 const (

etcd/callback.go

@@ -26,8 +26,8 @@ import (
 	"github.com/purpleidea/mgmt/util"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcd "go.etcd.io/etcd/clientv3" // "clientv3"
-	pb "go.etcd.io/etcd/etcdserver/etcdserverpb"
+	pb "go.etcd.io/etcd/api/v3/etcdserverpb"
+	etcd "go.etcd.io/etcd/client/v3" // "client/v3"
 )
 
 // nominateApply applies the changed watcher data onto our local caches.
@@ -306,7 +306,7 @@ func (obj *EmbdEtcd) volunteerCb(ctx context.Context) error {
 
 	// NOTE: There used to be an is_leader check right here...
 	// FIXME: Should we use WithRequireLeader instead? Here? Elsewhere?
-	// https://godoc.org/github.com/etcd-io/etcd/clientv3#WithRequireLeader
+	// https://godoc.org/github.com/etcd-io/etcd/client/v3#WithRequireLeader
 
 	// FIXME: can this happen, and if so, is it an error or a pass-through?
 	if len(obj.volunteers) == 0 {

etcd/chooser/chooser.go

@@ -22,7 +22,7 @@ import (
 
 	"github.com/purpleidea/mgmt/etcd/interfaces"
 
-	etcdtypes "go.etcd.io/etcd/pkg/types"
+	etcdtypes "go.etcd.io/etcd/client/pkg/v3/types"
 )
 
 // Data represents the input data that is passed to the chooser.

etcd/chooser/dynamicsize.go

@@ -25,8 +25,8 @@ import (
 
 	"github.com/purpleidea/mgmt/etcd/interfaces"
 
-	etcd "go.etcd.io/etcd/clientv3"
-	etcdtypes "go.etcd.io/etcd/pkg/types"
+	etcd "go.etcd.io/etcd/client/v3"
+	etcdtypes "go.etcd.io/etcd/client/pkg/v3/types"
 )
 
 // XXX: Test causing cluster shutdowns with:

etcd/client/resources/resources.go

@@ -27,7 +27,7 @@ import (
 	"github.com/purpleidea/mgmt/etcd/interfaces"
 	"github.com/purpleidea/mgmt/util"
 
-	etcd "go.etcd.io/etcd/clientv3"
+	etcd "go.etcd.io/etcd/client/v3"
 )
 
 const (

etcd/client/simple.go

@@ -26,8 +26,8 @@ import (
 	"github.com/purpleidea/mgmt/etcd/interfaces"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcd "go.etcd.io/etcd/clientv3" // "clientv3"
-	"go.etcd.io/etcd/clientv3/namespace"
+	etcd "go.etcd.io/etcd/client/v3" // "client/v3"
+	"go.etcd.io/etcd/client/v3/namespace"
 )
 
 // method represents the method we used to build the simple client.

etcd/client/str/str.go

@@ -24,8 +24,8 @@ import (
 	"github.com/purpleidea/mgmt/etcd/interfaces"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcd "go.etcd.io/etcd/clientv3"
-	etcdutil "go.etcd.io/etcd/clientv3/clientv3util"
+	etcd "go.etcd.io/etcd/client/v3"
+	etcdutil "go.etcd.io/etcd/client/v3/clientv3util"
 )
 
 const (

etcd/client/strmap/strmap.go

@@ -26,8 +26,8 @@ import (
 	"github.com/purpleidea/mgmt/util"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcd "go.etcd.io/etcd/clientv3"
-	etcdutil "go.etcd.io/etcd/clientv3/clientv3util"
+	etcd "go.etcd.io/etcd/client/v3"
+	etcdutil "go.etcd.io/etcd/client/v3/clientv3util"
 )
 
 const (

etcd/converger.go

@@ -23,7 +23,7 @@ import (
 
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcd "go.etcd.io/etcd/clientv3"
+	etcd "go.etcd.io/etcd/client/v3"
 )
 
 // setHostnameConverged sets whether a specific hostname is converged.

etcd/deployer/deployer.go

@@ -27,8 +27,8 @@ import (
 	"github.com/purpleidea/mgmt/etcd/interfaces"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcd "go.etcd.io/etcd/clientv3"
-	etcdutil "go.etcd.io/etcd/clientv3/clientv3util"
+	etcd "go.etcd.io/etcd/client/v3"
+	etcdutil "go.etcd.io/etcd/client/v3/clientv3util"
 )
 
 const (

etcd/etcd.go

@@ -122,11 +122,11 @@ import (
 	"github.com/purpleidea/mgmt/util"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcd "go.etcd.io/etcd/clientv3" // "clientv3"
-	"go.etcd.io/etcd/clientv3/concurrency"
-	"go.etcd.io/etcd/clientv3/namespace"
-	"go.etcd.io/etcd/embed"
-	etcdtypes "go.etcd.io/etcd/pkg/types"
+	etcd "go.etcd.io/etcd/client/v3" // "client/v3"
+	"go.etcd.io/etcd/client/v3/concurrency"
+	"go.etcd.io/etcd/client/v3/namespace"
+	etcdtypes "go.etcd.io/etcd/client/pkg/v3/types"
+	"go.etcd.io/etcd/server/v3/embed"
 )
 
 const (

etcd/fs/file.go

@@ -30,8 +30,8 @@ import (
 
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcd "go.etcd.io/etcd/clientv3" // "clientv3"
-	etcdutil "go.etcd.io/etcd/clientv3/clientv3util"
+	etcd "go.etcd.io/etcd/client/v3" // "client/v3"
+	etcdutil "go.etcd.io/etcd/client/v3/clientv3util"
 )
 
 func init() {

etcd/fs/fs.go

@@ -38,8 +38,8 @@ import (
 	"github.com/purpleidea/mgmt/util/errwrap"
 
 	"github.com/spf13/afero"
-	etcd "go.etcd.io/etcd/clientv3" // "clientv3"
-	rpctypes "go.etcd.io/etcd/etcdserver/api/v3rpc/rpctypes"
+	"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
+	etcd "go.etcd.io/etcd/client/v3" // "client/v3"
 )
 
 func init() {

etcd/helpers.go

@@ -27,10 +27,10 @@ import (
 	"github.com/purpleidea/mgmt/util"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcd "go.etcd.io/etcd/clientv3"
-	pb "go.etcd.io/etcd/etcdserver/etcdserverpb"
-	"go.etcd.io/etcd/mvcc/mvccpb"
-	etcdtypes "go.etcd.io/etcd/pkg/types" // generated package
+	pb "go.etcd.io/etcd/api/v3/etcdserverpb"
+	"go.etcd.io/etcd/api/v3/mvccpb"
+	etcd "go.etcd.io/etcd/client/v3"
+	etcdtypes "go.etcd.io/etcd/client/pkg/v3/types" // generated package
 )
 
 // setEndpoints sets the endpoints on the etcd client if it exists. It

etcd/interfaces/client.go

@@ -20,8 +20,8 @@ package interfaces
 import (
 	"context"
 
-	etcd "go.etcd.io/etcd/clientv3" // "clientv3"
-	pb "go.etcd.io/etcd/etcdserver/etcdserverpb"
+	pb "go.etcd.io/etcd/api/v3/etcdserverpb"
+	etcd "go.etcd.io/etcd/client/v3" // "client/v3"
 )
 
 // WatcherData is the structure of data passed to a callback from any watcher.

etcd/membership.go

@@ -26,10 +26,10 @@ import (
 
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcd "go.etcd.io/etcd/clientv3"
-	rpctypes "go.etcd.io/etcd/etcdserver/api/v3rpc/rpctypes"
-	pb "go.etcd.io/etcd/etcdserver/etcdserverpb"
-	etcdtypes "go.etcd.io/etcd/pkg/types"
+	pb "go.etcd.io/etcd/api/v3/etcdserverpb"
+	"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
+	etcd "go.etcd.io/etcd/client/v3"
+	etcdtypes "go.etcd.io/etcd/client/pkg/v3/types"
 )
 
 // addSelfState is used to populate the initial state when I am adding myself.

etcd/methods.go

@@ -24,9 +24,9 @@ import (
 
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcd "go.etcd.io/etcd/clientv3"
-	etcdutil "go.etcd.io/etcd/clientv3/clientv3util"
-	etcdtypes "go.etcd.io/etcd/pkg/types"
+	etcd "go.etcd.io/etcd/client/v3"
+	etcdutil "go.etcd.io/etcd/client/v3/clientv3util"
+	etcdtypes "go.etcd.io/etcd/client/pkg/v3/types"
 )
 
 // volunteer offers yourself up to be a server if needed. If you specify a nil

etcd/scheduler/scheduler.go

@@ -28,8 +28,8 @@ import (
 
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcd "go.etcd.io/etcd/clientv3"
-	"go.etcd.io/etcd/clientv3/concurrency"
+	etcd "go.etcd.io/etcd/client/v3"
+	"go.etcd.io/etcd/client/v3/concurrency"
 )
 
 const (

etcd/server.go

@@ -27,8 +27,8 @@ import (
 	"github.com/purpleidea/mgmt/util"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	"go.etcd.io/etcd/embed"
-	etcdtypes "go.etcd.io/etcd/pkg/types"
+	etcdtypes "go.etcd.io/etcd/client/pkg/v3/types"
+	"go.etcd.io/etcd/server/v3/embed"
 )
 
 const (

etcd/util.go

@@ -26,7 +26,7 @@ import (
 
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	etcdtypes "go.etcd.io/etcd/pkg/types"
+	etcdtypes "go.etcd.io/etcd/client/pkg/v3/types"
 )
 
 // copyURL copies a URL.

examples/lib/exec-send-recv.go

@@ -16,7 +16,7 @@ import (
 	mgmt "github.com/purpleidea/mgmt/lib"
 	"github.com/purpleidea/mgmt/pgraph"
 
-	"github.com/urfave/cli"
+	"github.com/urfave/cli/v2"
 )
 
 // XXX: this has not been updated to latest GAPI/Deploy API. Patches welcome!

examples/lib/libmgmt-subgraph0.go

@@ -17,7 +17,7 @@ import (
 	"github.com/purpleidea/mgmt/pgraph"
 	"github.com/purpleidea/mgmt/util/errwrap"
 
-	"github.com/urfave/cli"
+	"github.com/urfave/cli/v2"
 )
 
 // XXX: this has not been updated to latest GAPI/Deploy API. Patches welcome!

examples/lib/libmgmt-subgraph1.go

@@ -16,7 +16,7 @@ import (
 	mgmt "github.com/purpleidea/mgmt/lib"
 	"github.com/purpleidea/mgmt/pgraph"
 
-	"github.com/urfave/cli"
+	"github.com/urfave/cli/v2"
 )
 
 // XXX: this has not been updated to latest GAPI/Deploy API. Patches welcome!

examples/lib/libmgmt2.go

@@ -16,7 +16,7 @@ import (
 	mgmt "github.com/purpleidea/mgmt/lib"
 	"github.com/purpleidea/mgmt/pgraph"
 
-	"github.com/urfave/cli"
+	"github.com/urfave/cli/v2"
 )
 
 // XXX: this has not been updated to latest GAPI/Deploy API. Patches welcome!