fix local dns search

Previously, the /etc/resolv.conf was inherited from the host. It would
thus also inherit the search domains. Now, the generated image lacks the
host's resolv.conf and thus it search domains. This is good for
reproducibility. In order to continue resolving plain host names, we
tell qemu to serve the search domain via dhcp and we tell networkd to
trust the dhcp server's domains.

Signed-off-by: Jochen Sprickerhof <git@jochen.sprickerhof.de>

2 files changed, 5 insertions, 1 deletions

diff --git a/debvm-create b/debvm-create
index e907962..5bcd55d 100755
--- a/debvm-create
+++ b/debvm-create
@@ -157,7 +157,7 @@ set -- '--customize-hook=chroot "$1" passwd --delete root' "$@"
 # dhcp on all network interfaces
 set -- \
 	'--customize-hook=chroot "$1" systemctl enable systemd-networkd.service' \
-	"--customize-hook=printf '"'[Match]\nName=en*\nName=eth*\n[Network]\nDHCP=yes\n'"'"' > "$1/etc/systemd/network/20-wired.network"' \
+	"--customize-hook=printf '"'[Match]\nName=en*\nName=eth*\n[Network]\nDHCP=yes\n[DHCPv4]\nUseDomains=yes\n'"'"' > "$1/etc/systemd/network/20-wired.network"' \
 	"$@"
 
 # add ssh key for root
diff --git a/debvm-run b/debvm-run
index 9b26a76..ffae61c 100755
--- a/debvm-run
+++ b/debvm-run
@@ -144,6 +144,10 @@ fi
 if test -n "$SSHPORT"; then
 	NETDEV="$NETDEV,hostfwd=tcp:127.0.0.1:$SSHPORT-:22"
 fi
+DNSSEARCH=$(dnsdomainname)
+if test -n "$DNSSEARCH"; then
+	NETDEV="$NETDEV,dnssearch=$DNSSEARCH"
+fi
 set -- \
 	-append "$KERNEL_CMDLINE" \
 	-netdev "$NETDEV" \