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package generate
import (
"context"
"fmt"
"io/ioutil"
"os"
buildahDefine "github.com/containers/buildah/define"
"github.com/containers/common/pkg/config"
"github.com/containers/podman/v4/libpod"
"github.com/containers/podman/v4/libpod/define"
)
// PullOrBuildInfraImage pulls down the specified image or the one set in
// containers.conf. If none is set, it builds a local pause image.
func PullOrBuildInfraImage(rt *libpod.Runtime, imageName string) (string, error) {
rtConfig, err := rt.GetConfigNoCopy()
if err != nil {
return "", err
}
if imageName == "" {
imageName = rtConfig.Engine.InfraImage
}
if imageName != "" {
_, err := rt.LibimageRuntime().Pull(context.Background(), imageName, config.PullPolicyMissing, nil)
if err != nil {
return "", err
}
return imageName, nil
}
name, err := buildPauseImage(rt, rtConfig)
if err != nil {
return "", fmt.Errorf("building local pause image: %w", err)
}
return name, nil
}
func buildPauseImage(rt *libpod.Runtime, rtConfig *config.Config) (string, error) {
version, err := define.GetVersion()
if err != nil {
return "", err
}
imageName := fmt.Sprintf("localhost/podman-pause:%s-%d", version.Version, version.Built)
// First check if the image has already been built.
if _, _, err := rt.LibimageRuntime().LookupImage(imageName, nil); err == nil {
return imageName, nil
}
// Also look into the path as some distributions install catatonit in
// /usr/bin.
catatonitPath, err := rtConfig.FindHelperBinary("catatonit", true)
if err != nil {
return "", fmt.Errorf("finding pause binary: %w", err)
}
buildContent := fmt.Sprintf(`FROM scratch
COPY %s /catatonit
ENTRYPOINT ["/catatonit", "-P"]`, catatonitPath)
tmpF, err := ioutil.TempFile("", "pause.containerfile")
if err != nil {
return "", err
}
if _, err := tmpF.WriteString(buildContent); err != nil {
return "", err
}
if err := tmpF.Close(); err != nil {
return "", err
}
defer os.Remove(tmpF.Name())
buildOptions := buildahDefine.BuildOptions{
CommonBuildOpts: &buildahDefine.CommonBuildOptions{},
Output: imageName,
Quiet: true,
IgnoreFile: "/dev/null", // makes sure to not read a local .ignorefile (see #13529)
IIDFile: "/dev/null", // prevents Buildah from writing the ID on stdout
IDMappingOptions: &buildahDefine.IDMappingOptions{
// Use the host UID/GID mappings for the build to avoid issues when
// running with a custom mapping (BZ #2083997).
HostUIDMapping: true,
HostGIDMapping: true,
},
}
if _, _, err := rt.Build(context.Background(), buildOptions, tmpF.Name()); err != nil {
return "", err
}
return imageName, nil
}
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