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, 53 insertions, 0 deletions

diff --git a/pkg/specgen/generate/container.go b/pkg/specgen/generate/container.go
index 8cfac924b..b5d10df8c 100644
--- a/pkg/specgen/generate/container.go
+++ b/pkg/specgen/generate/container.go
@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"strconv"
 	"strings"
 	"time"
 
@@ -555,3 +556,41 @@ func FinishThrottleDevices(s *specgen.SpecGenerator) error {
 	}
 	return nil
 }
+
+// Check name looks for existing containers/pods with the same name, and modifies the given string until a new name is found
+func CheckName(rt *libpod.Runtime, n string, kind bool) string {
+	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.
+			if kind {
+				_, err = rt.LookupContainer(n + "1")
+			} else {
+				_, err = rt.LookupPod(n + "1")
+			}
+
+			if err != nil {
+				n += "1"
+				break
+			}
+		} else {
+			n = n[0:ind]
+		}
+		err = nil
+		count := num
+		for err == nil {
+			count++
+			tempN := n + strconv.Itoa(count)
+			if kind {
+				_, err = rt.LookupContainer(tempN)
+			} else {
+				_, err = rt.LookupPod(tempN)
+			}
+		}
+		n += strconv.Itoa(count)
+	default:
+		n += "-clone"
+	}
+	return n
+}
diff --git a/pkg/specgen/generate/pod_create.go b/pkg/specgen/generate/pod_create.go
index 4e6362c9b..d6063b9a0 100644
--- a/pkg/specgen/generate/pod_create.go
+++ b/pkg/specgen/generate/pod_create.go
@@ -2,6 +2,7 @@ package generate
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"net"
 	"os"
@@ -327,6 +328,19 @@ func PodConfigToSpec(rt *libpod.Runtime, spec *specgen.PodSpecGenerator, infraOp
 		}
 
 		spec.InfraContainerSpec = infraSpec
+		matching, err := json.Marshal(infraSpec)
+		if err != nil {
+			return nil, err
+		}
+
+		// track name before unmarshal so we do not overwrite w/ infra
+		name := spec.Name
+		err = json.Unmarshal(matching, spec)
+		if err != nil {
+			return nil, err
+		}
+
+		spec.Name = name
 	}
 
 	// need to reset hostname, name etc of both pod and infra