feat: add localhost into hosts if the networking mode is not host

Signed-off-by: Parham Alvani <1995parham@tuta.io>

1 files changed, 16 insertions, 0 deletions

diff --git a/libpod/container_internal_linux.go b/libpod/container_internal_linux.go
index 847122929..cafa3c642 100644
--- a/libpod/container_internal_linux.go
+++ b/libpod/container_internal_linux.go
@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 package libpod
@@ -1942,9 +1943,24 @@ func (c *Container) generateHosts(path string) (string, error) {
 	}
 	hosts := string(orig)
 	hosts += c.getHosts()
+
+	hosts = c.appendLocalhost(hosts)
+
 	return c.writeStringToRundir("hosts", hosts)
 }
 
+// based on networking mode we may want to append the localhost
+// if there isn't any record for it and also this shoud happen
+// in slirp4netns and similar network modes.
+func (c *Container) appendLocalhost(hosts string) string {
+	if !strings.Contains(hosts, "localhost") &&
+		!c.config.NetMode.IsHost() {
+		hosts += "127.0.0.1\tlocalhost\n::1\tlocalhost\n"
+	}
+
+	return hosts
+}
+
 // appendHosts appends a container's config and state pertaining to hosts to a container's
 // local hosts file. netCtr is the container from which the netNS information is
 // taken.