unschroot: create an /etc/hosts unless it exists

Software has a reasonable assumption that localhost as well as the
current hostname resolves to an IP address. Without an /etc/hosts file,
this is not the case and makes some builds such as src:ovn fail.

1 files changed, 9 insertions, 0 deletions

diff --git a/examples/unschroot.py b/examples/unschroot.py
index 5f6ad72..cbabcc4 100755
--- a/examples/unschroot.py
+++ b/examples/unschroot.py
@@ -167,6 +167,15 @@ def do_begin_session(args: argparse.Namespace) -> None:
             for tmem in tarf:
                 if not tmem.name.startswith(("dev/", "./dev/")):
                     tarf.extract(tmem, numeric_owner=True)
+            etc_hosts = pathlib.Path("./etc/hosts")
+            if not etc_hosts.exists():
+                etc_hosts.write_text(
+                    """127.0.0.1 localhost
+127.0.1.1 %s
+::1 localhost ip6-localhost ip6-loopback
+"""
+                    % socket.gethostname(),
+                )
             sys.exit(0)
     childsock.close()
     mainsock.recv(1)