github.com/containers/podman/v2@v2.2.2-0.20210501105131-c1e07d070c4c/pkg/api/handlers/compat/containers_export.go (about)

     1  package compat
     2  
     3  import (
     4  	"io/ioutil"
     5  	"net/http"
     6  	"os"
     7  
     8  	"github.com/containers/podman/v2/libpod"
     9  	"github.com/containers/podman/v2/pkg/api/handlers/utils"
    10  	"github.com/pkg/errors"
    11  )
    12  
    13  func ExportContainer(w http.ResponseWriter, r *http.Request) {
    14  	runtime := r.Context().Value("runtime").(*libpod.Runtime)
    15  	name := utils.GetName(r)
    16  	con, err := runtime.LookupContainer(name)
    17  	if err != nil {
    18  		utils.ContainerNotFound(w, name, err)
    19  		return
    20  	}
    21  	tmpfile, err := ioutil.TempFile("", "api.tar")
    22  	if err != nil {
    23  		utils.Error(w, "unable to create tarball tempfile", http.StatusInternalServerError, errors.Wrap(err, "unable to create tempfile"))
    24  		return
    25  	}
    26  	defer os.Remove(tmpfile.Name())
    27  	if err := tmpfile.Close(); err != nil {
    28  		utils.Error(w, "unable to close tempfile", http.StatusInternalServerError, errors.Wrap(err, "unable to close tempfile"))
    29  		return
    30  	}
    31  	if err := con.Export(tmpfile.Name()); err != nil {
    32  		utils.Error(w, "failed to save the image", http.StatusInternalServerError, errors.Wrap(err, "failed to save image"))
    33  		return
    34  	}
    35  	rdr, err := os.Open(tmpfile.Name())
    36  	if err != nil {
    37  		utils.Error(w, "failed to read temp tarball", http.StatusInternalServerError, errors.Wrap(err, "failed to read the exported tarfile"))
    38  		return
    39  	}
    40  	defer rdr.Close()
    41  	utils.WriteResponse(w, http.StatusOK, rdr)
    42  }