1 files changed, 36 insertions, 20 deletions

diff --git a/libpod/container_internal_linux.go b/libpod/container_internal_linux.go
index 1b2f5a496..94bf7855b 100644
--- a/libpod/container_internal_linux.go
+++ b/libpod/container_internal_linux.go
@@ -985,7 +985,7 @@ func (c *Container) exportCheckpoint(options ContainerCheckpointOptions) error {
 	}
 
 	input, err := archive.TarWithOptions(c.bundlePath(), &archive.TarOptions{
-		Compression:      archive.Gzip,
+		Compression:      options.Compression,
 		IncludeSourceDir: true,
 		IncludeFiles:     includeFiles,
 	})
@@ -1650,35 +1650,32 @@ func (c *Container) generateResolvConf() (string, error) {
 		}
 	}
 
-	// Determine the endpoint for resolv.conf in case it is a symlink
-	resolvPath, err := filepath.EvalSymlinks(resolvConf)
+	contents, err := ioutil.ReadFile(resolvConf)
 	// resolv.conf doesn't have to exists
 	if err != nil && !os.IsNotExist(err) {
 		return "", err
 	}
 
-	// Determine if symlink points to any of the systemd-resolved files
-	if strings.HasPrefix(resolvPath, "/run/systemd/resolve/") {
-		resolvPath = "/run/systemd/resolve/resolv.conf"
-	}
-
-	contents, err := ioutil.ReadFile(resolvPath)
-	// resolv.conf doesn't have to exists
-	if err != nil && !os.IsNotExist(err) {
-		return "", err
-	}
-
-	// Ensure that the container's /etc/resolv.conf is compatible with its
-	// network configuration.
-	// TODO: set ipv6 enable bool more sanely
-	resolv, err := resolvconf.FilterResolvDNS(contents, true, c.config.CreateNetNS)
-	if err != nil {
-		return "", errors.Wrapf(err, "error parsing host resolv.conf")
+	ns := resolvconf.GetNameservers(contents)
+	// check if systemd-resolved is used, assume it is used when 127.0.0.53 is the only nameserver
+	if len(ns) == 1 && ns[0] == "127.0.0.53" {
+		// read the actual resolv.conf file for systemd-resolved
+		contents, err = ioutil.ReadFile("/run/systemd/resolve/resolv.conf")
+		if err != nil {
+			return "", errors.Wrapf(err, "detected that systemd-resolved is in use, but could not locate real resolv.conf")
+		}
 	}
 
+	ipv6 := false
 	// Check if CNI gave back and DNS servers for us to add in
 	cniResponse := c.state.NetworkStatus
 	for _, i := range cniResponse {
+		for _, ip := range i.IPs {
+			// Note: only using To16() does not work since it also returns a vaild ip for ipv4
+			if ip.Address.IP.To4() == nil && ip.Address.IP.To16() != nil {
+				ipv6 = true
+			}
+		}
 		if i.DNS.Nameservers != nil {
 			cniNameServers = append(cniNameServers, i.DNS.Nameservers...)
 			logrus.Debugf("adding nameserver(s) from cni response of '%q'", i.DNS.Nameservers)
@@ -1689,6 +1686,25 @@ func (c *Container) generateResolvConf() (string, error) {
 		}
 	}
 
+	if c.config.NetMode.IsSlirp4netns() {
+		ctrNetworkSlipOpts := []string{}
+		if c.config.NetworkOptions != nil {
+			ctrNetworkSlipOpts = append(ctrNetworkSlipOpts, c.config.NetworkOptions["slirp4netns"]...)
+		}
+		slirpOpts, err := parseSlirp4netnsNetworkOptions(c.runtime, ctrNetworkSlipOpts)
+		if err != nil {
+			return "", err
+		}
+		ipv6 = slirpOpts.enableIPv6
+	}
+
+	// Ensure that the container's /etc/resolv.conf is compatible with its
+	// network configuration.
+	resolv, err := resolvconf.FilterResolvDNS(contents, ipv6, c.config.CreateNetNS)
+	if err != nil {
+		return "", errors.Wrapf(err, "error parsing host resolv.conf")
+	}
+
 	dns := make([]net.IP, 0, len(c.runtime.config.Containers.DNSServers))
 	for _, i := range c.runtime.config.Containers.DNSServers {
 		result := net.ParseIP(i)