podmanv2 export

add ability to export a container to a tarball

Signed-off-by: Brent Baude <bbaude@redhat.com>

2 files changed, 87 insertions, 0 deletions

diff --git a/pkg/api/handlers/compat/containers_export.go b/pkg/api/handlers/compat/containers_export.go
new file mode 100644
index 000000000..37b9fbf2b
--- /dev/null
+++ b/pkg/api/handlers/compat/containers_export.go
@@ -0,0 +1,42 @@
+package compat
+
+import (
+	"io/ioutil"
+	"net/http"
+	"os"
+
+	"github.com/containers/libpod/libpod"
+	"github.com/containers/libpod/pkg/api/handlers/utils"
+	"github.com/pkg/errors"
+)
+
+func ExportContainer(w http.ResponseWriter, r *http.Request) {
+	runtime := r.Context().Value("runtime").(*libpod.Runtime)
+	name := utils.GetName(r)
+	con, err := runtime.LookupContainer(name)
+	if err != nil {
+		utils.ContainerNotFound(w, name, err)
+		return
+	}
+	tmpfile, err := ioutil.TempFile("", "api.tar")
+	if err != nil {
+		utils.Error(w, "unable to create tarball tempfile", http.StatusInternalServerError, errors.Wrap(err, "unable to create tempfile"))
+		return
+	}
+	defer os.Remove(tmpfile.Name())
+	if err := tmpfile.Close(); err != nil {
+		utils.Error(w, "unable to close tempfile", http.StatusInternalServerError, errors.Wrap(err, "unable to close tempfile"))
+		return
+	}
+	if err := con.Export(tmpfile.Name()); err != nil {
+		utils.Error(w, "failed to save the image", http.StatusInternalServerError, errors.Wrap(err, "failed to save image"))
+		return
+	}
+	rdr, err := os.Open(tmpfile.Name())
+	if err != nil {
+		utils.Error(w, "failed to read temp tarball", http.StatusInternalServerError, errors.Wrap(err, "failed to read the exported tarfile"))
+		return
+	}
+	defer rdr.Close()
+	utils.WriteResponse(w, http.StatusOK, rdr)
+}
diff --git a/pkg/api/server/register_containers.go b/pkg/api/server/register_containers.go
index 08834ff01..145c054c0 100644
--- a/pkg/api/server/register_containers.go
+++ b/pkg/api/server/register_containers.go
@@ -587,6 +587,29 @@ func (s *APIServer) registerContainersHandlers(r *mux.Router) error {
 	r.HandleFunc(VersionedPath("/containers/{name}/resize"), s.APIHandler(compat.ResizeContainer)).Methods(http.MethodPost)
 	// Added non version path to URI to support docker non versioned paths
 	r.HandleFunc("/containers/{name}/resize", s.APIHandler(compat.ResizeContainer)).Methods(http.MethodPost)
+	// swagger:operation GET /containers/{name}/export compat exportContainer
+	// ---
+	// tags:
+	//   - containers (compat)
+	// summary: Export a container
+	// description: Export the contents of a container as a tarball.
+	// parameters:
+	//  - in: path
+	//    name: name
+	//    type: string
+	//    required: true
+	//    description: the name or ID of the container
+	// produces:
+	// - application/json
+	// responses:
+	//   200:
+	//     description: tarball is returned in body
+	//   404:
+	//     $ref: "#/responses/NoSuchContainer"
+	//   500:
+	//     $ref: "#/responses/InternalError"
+	r.HandleFunc(VersionedPath("/containers/{name}/export"), s.APIHandler(compat.ExportContainer)).Methods(http.MethodGet)
+	r.HandleFunc("/containers/{name}/export", s.APIHandler(compat.ExportContainer)).Methods(http.MethodGet)
 
 	/*
 		libpod endpoints
@@ -1237,5 +1260,27 @@ func (s *APIServer) registerContainersHandlers(r *mux.Router) error {
 	//   500:
 	//     $ref: "#/responses/InternalError"
 	r.HandleFunc(VersionedPath("/libpod/containers/{name}/resize"), s.APIHandler(compat.ResizeContainer)).Methods(http.MethodPost)
+	// swagger:operation GET /libpod/containers/{name}/export libpod libpodExportContainer
+	// ---
+	// tags:
+	//   - containers
+	// summary: Export a container
+	// description: Export the contents of a container as a tarball.
+	// parameters:
+	//  - in: path
+	//    name: name
+	//    type: string
+	//    required: true
+	//    description: the name or ID of the container
+	// produces:
+	// - application/json
+	// responses:
+	//   200:
+	//     description: tarball is returned in body
+	//   404:
+	//     $ref: "#/responses/NoSuchContainer"
+	//   500:
+	//     $ref: "#/responses/InternalError"
+	r.HandleFunc(VersionedPath("/libpod/containers/{name}/export"), s.APIHandler(compat.ExportContainer)).Methods(http.MethodGet)
 	return nil
 }