podman generate spec

implement a new command `podman generate spec` which can formulate a json specgen to be consumed by both the pod
and container creation API.

supported flags are

--verbose (default true) print output to the terminal
--compact print the json output in a single line format to be piped to the API
--filename put the output in a file
--clone rename the pod/ctr in the spec so it won't conflict w/ an existing entity

Signed-off-by: Charlie Doern <cdoern@redhat.com>

2 files changed, 61 insertions, 26 deletions

diff --git a/pkg/domain/infra/abi/containers.go b/pkg/domain/infra/abi/containers.go
index ed149a869..2820032c9 100644
--- a/pkg/domain/infra/abi/containers.go
+++ b/pkg/domain/infra/abi/containers.go
@@ -7,7 +7,6 @@ import (
 	"io/ioutil"
 	"os"
 	"strconv"
-	"strings"
 	"sync"
 	"time"
 
@@ -1669,31 +1668,7 @@ func (ic *ContainerEngine) ContainerClone(ctx context.Context, ctrCloneOpts enti
 		if err == nil {
 			n += "-clone"
 		}
-		switch {
-		case strings.Contains(n, "-clone"):
-			ind := strings.Index(n, "-clone") + 6
-			num, err := strconv.Atoi(n[ind:])
-			if num == 0 && err != nil { // clone1 is hard to get with this logic, just check for it here.
-				_, err = ic.Libpod.LookupContainer(n + "1")
-				if err != nil {
-					spec.Name = n + "1"
-					break
-				}
-			} else {
-				n = n[0:ind]
-			}
-			err = nil
-			count := num
-			for err == nil {
-				count++
-				tempN := n + strconv.Itoa(count)
-				_, err = ic.Libpod.LookupContainer(tempN)
-			}
-			n += strconv.Itoa(count)
-			spec.Name = n
-		default:
-			spec.Name = c.Name() + "-clone"
-		}
+		spec.Name = generate.CheckName(ic.Libpod, n, true)
 	}
 
 	rtSpec, spec, opts, err := generate.MakeContainer(context.Background(), ic.Libpod, spec, true, c)
diff --git a/pkg/domain/infra/abi/generate.go b/pkg/domain/infra/abi/generate.go
index 31885ce54..f588f591a 100644
--- a/pkg/domain/infra/abi/generate.go
+++ b/pkg/domain/infra/abi/generate.go
@@ -3,6 +3,7 @@ package abi
 import (
 	"bytes"
 	"context"
+	"encoding/json"
 	"fmt"
 	"strings"
 
@@ -10,6 +11,8 @@ import (
 	"github.com/containers/podman/v4/libpod/define"
 	"github.com/containers/podman/v4/pkg/domain/entities"
 	k8sAPI "github.com/containers/podman/v4/pkg/k8s.io/api/core/v1"
+	"github.com/containers/podman/v4/pkg/specgen"
+	generateUtils "github.com/containers/podman/v4/pkg/specgen/generate"
 	"github.com/containers/podman/v4/pkg/systemd/generate"
 	"github.com/ghodss/yaml"
 )
@@ -41,6 +44,63 @@ func (ic *ContainerEngine) GenerateSystemd(ctx context.Context, nameOrID string,
 	return &entities.GenerateSystemdReport{Units: units}, nil
 }
 
+func (ic *ContainerEngine) GenerateSpec(ctx context.Context, opts *entities.GenerateSpecOptions) (*entities.GenerateSpecReport, error) {
+	var spec *specgen.SpecGenerator
+	var pspec *specgen.PodSpecGenerator
+	var err error
+	if _, err := ic.Libpod.LookupContainer(opts.ID); err == nil {
+		spec = &specgen.SpecGenerator{}
+		_, _, err = generateUtils.ConfigToSpec(ic.Libpod, spec, opts.ID)
+		if err != nil {
+			return nil, err
+		}
+	} else if p, err := ic.Libpod.LookupPod(opts.ID); err == nil {
+		pspec = &specgen.PodSpecGenerator{}
+		pspec.Name = p.Name()
+		_, err := generateUtils.PodConfigToSpec(ic.Libpod, pspec, &entities.ContainerCreateOptions{}, opts.ID)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if pspec == nil && spec == nil {
+		return nil, fmt.Errorf("could not find a pod or container with the id %s", opts.ID)
+	}
+
+	// rename if we are looking to consume the output and make a new entity
+	if opts.Name {
+		if spec != nil {
+			spec.Name = generateUtils.CheckName(ic.Libpod, spec.Name, true)
+		} else {
+			pspec.Name = generateUtils.CheckName(ic.Libpod, pspec.Name, false)
+		}
+	}
+
+	j := []byte{}
+	if spec != nil {
+		j, err = json.MarshalIndent(spec, "", " ")
+		if err != nil {
+			return nil, err
+		}
+	} else if pspec != nil {
+		j, err = json.MarshalIndent(pspec, "", " ")
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// compact output
+	if opts.Compact {
+		compacted := &bytes.Buffer{}
+		err := json.Compact(compacted, j)
+		if err != nil {
+			return nil, err
+		}
+		return &entities.GenerateSpecReport{Data: compacted.Bytes()}, nil
+	}
+	return &entities.GenerateSpecReport{Data: j}, nil // regular output
+}
+
 func (ic *ContainerEngine) GenerateKube(ctx context.Context, nameOrIDs []string, options entities.GenerateKubeOptions) (*entities.GenerateKubeReport, error) {
 	var (
 		pods       []*libpod.Pod