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authorDaniel J Walsh <dwalsh@redhat.com>2020-10-06 07:04:18 -0400
committerDaniel J Walsh <dwalsh@redhat.com>2020-10-07 08:39:44 -0400
commit3ae47f7d2b9328ff47dc5702d834ae9ee296a27b (patch)
tree3818c5febd0457d5cec8cc5f09b8b34179239c7e /libpod
parenta7500e54a4646c7db477349e2530ac13df77b8fa (diff)
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Populate /etc/hosts file when run in a user namespace
We do not populate the hostname field with the IP Address when running within a user namespace. Fixes https://github.com/containers/podman/issues/7490 Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Diffstat (limited to 'libpod')
-rw-r--r--libpod/container_internal.go24
-rw-r--r--libpod/container_internal_linux.go5
2 files changed, 25 insertions, 4 deletions
diff --git a/libpod/container_internal.go b/libpod/container_internal.go
index d64d3ab87..4ae571de6 100644
--- a/libpod/container_internal.go
+++ b/libpod/container_internal.go
@@ -976,6 +976,21 @@ func (c *Container) completeNetworkSetup() error {
}
}
}
+ // check if we have a bindmount for /etc/hosts
+ if hostsBindMount, ok := state.BindMounts["/etc/hosts"]; ok && len(c.cniHosts()) > 0 {
+ ctrHostPath := filepath.Join(c.state.RunDir, "hosts")
+ if hostsBindMount == ctrHostPath {
+ // read the existing hosts
+ b, err := ioutil.ReadFile(hostsBindMount)
+ if err != nil {
+ return err
+ }
+ if err := ioutil.WriteFile(hostsBindMount, append(b, []byte(c.cniHosts())...), 0644); err != nil {
+ return err
+ }
+ }
+ }
+
// check if we have a bindmount for resolv.conf
resolvBindMount := state.BindMounts["/etc/resolv.conf"]
if len(outResolvConf) < 1 || resolvBindMount == "" || len(c.config.NetNsCtr) > 0 {
@@ -997,6 +1012,15 @@ func (c *Container) completeNetworkSetup() error {
return ioutil.WriteFile(resolvBindMount, []byte(strings.Join(outResolvConf, "\n")), 0644)
}
+func (c *Container) cniHosts() string {
+ var hosts string
+ if len(c.state.NetworkStatus) > 0 && len(c.state.NetworkStatus[0].IPs) > 0 {
+ ipAddress := strings.Split(c.state.NetworkStatus[0].IPs[0].Address.String(), "/")[0]
+ hosts += fmt.Sprintf("%s\t%s %s\n", ipAddress, c.Hostname(), c.Config().Name)
+ }
+ return hosts
+}
+
// Initialize a container, creating it in the runtime
func (c *Container) init(ctx context.Context, retainRetries bool) error {
span, _ := opentracing.StartSpanFromContext(ctx, "init")
diff --git a/libpod/container_internal_linux.go b/libpod/container_internal_linux.go
index 894982973..41cc80789 100644
--- a/libpod/container_internal_linux.go
+++ b/libpod/container_internal_linux.go
@@ -1543,10 +1543,7 @@ func (c *Container) getHosts() string {
// When using slirp4netns, the interface gets a static IP
hosts += fmt.Sprintf("# used by slirp4netns\n%s\t%s %s\n", "10.0.2.100", c.Hostname(), c.Config().Name)
}
- if len(c.state.NetworkStatus) > 0 && len(c.state.NetworkStatus[0].IPs) > 0 {
- ipAddress := strings.Split(c.state.NetworkStatus[0].IPs[0].Address.String(), "/")[0]
- hosts += fmt.Sprintf("%s\t%s %s\n", ipAddress, c.Hostname(), c.Config().Name)
- }
+ hosts += c.cniHosts()
return hosts
}