[Buildroot] [git commit branch/2020.11.x] package/ebtables: install symlink to ebtables-legacy

[Buildroot] [git commit branch/2020.11.x] package/ebtables: install symlink to ebtables-legacy

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=5d3e919bfb11147d9bf648c9771aeb598f9747a2
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2020.11.x

Since the upgrade of ebtables from 2.0.10-4 to 2.0.11, there no longer is an
'ebtables' binary. It has been renamed to 'ebtables-legacy' and moved from
'/sbin' to '/usr/sbin'. This change is part of the upstream change to
integrate the functionality of ebtables (and arptables) in the iptables
package, using the nf_tables kernel backend [1].

Unfortunately, the renaming (and move) of the original 'ebtables' binary
breaks existing scripts that are calling 'ebtables' or '/sbin/ebtables'.
Therefore, add a symlink from the original path to 'ebtables-legacy'.

However, do not provide this symlink if BR2_PACKAGE_IPTABLES_NFTABLES is
enabled. In this case, the iptables package will build the new equivalent
of ebtables -- a symlink to ebtables-legacy would cause conflicts.

[1] https://wiki.nftables.org/wiki-nftables/index.php/Legacy_xtables_tools

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 938c0851093e9479380873c89f8e935a026b3cdf)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/ebtables/ebtables.mk | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/package/ebtables/ebtables.mk b/package/ebtables/ebtables.mk
index e8b982206c..e19e2f2ec1 100644
--- a/package/ebtables/ebtables.mk
+++ b/package/ebtables/ebtables.mk
@@ -31,4 +31,11 @@ endef
 EBTABLES_POST_INSTALL_TARGET_HOOKS += EBTABLES_REMOVE_UTILS_RESTORE
 endif
 
+ifeq ($(BR2_PACKAGE_IPTABLES_NFTABLES),)
+define EBTABLES_INSTALL_LEGACY_SYMLINK
+	ln -sf /usr/sbin/ebtables-legacy $(TARGET_DIR)/sbin/ebtables
+endef
+EBTABLES_POST_INSTALL_TARGET_HOOKS += EBTABLES_INSTALL_LEGACY_SYMLINK
+endif
+
 $(eval $(autotools-package))