[PATCH] dropbear: allow disabling support for scp

[Rui Salvaterra]

If not needed, disabling scp allows for a nice size reduction.

Dropbear executable size comparison:

153621 bytes (baseline)
133077 bytes (without scp)

In other words, we trim a total of 20544 bytes.

[Note: This patch is on top of
"dropbear: fix ssh alternative when dbclient isn't built"]

Signed-off-by: Rui Salvaterra <rsalvaterra at gmail.com>
---
 package/network/services/dropbear/Config.in | 4 ++++
 package/network/services/dropbear/Makefile  | 8 +++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/package/network/services/dropbear/Config.in b/package/network/services/dropbear/Config.in
index 0ac84ee206..b9ecbc815b 100644
--- a/package/network/services/dropbear/Config.in
+++ b/package/network/services/dropbear/Config.in
@@ -102,4 +102,8 @@ config DROPBEAR_DBCLIENT
 	bool "Build dropbear with dbclient"
 	default y
 
+config DROPBEAR_SCP
+	bool "Build dropbear with scp"
+	default y
+
 endmenu
diff --git a/package/network/services/dropbear/Makefile b/package/network/services/dropbear/Makefile
index edd20909b1..8b57b214ae 100644
--- a/package/network/services/dropbear/Makefile
+++ b/package/network/services/dropbear/Makefile
@@ -31,7 +31,7 @@ PKG_CONFIG_DEPENDS:= \
 	CONFIG_DROPBEAR_RSA CONFIG_DROPBEAR_CURVE25519 CONFIG_DROPBEAR_ZLIB \
 	CONFIG_DROPBEAR_ED25519 CONFIG_DROPBEAR_CHACHA20POLY1305 \
 	CONFIG_DROPBEAR_UTMP CONFIG_DROPBEAR_PUTUTLINE \
-	CONFIG_DROPBEAR_DBCLIENT
+	CONFIG_DROPBEAR_DBCLIENT CONFIG_DROPBEAR_SCP
 
 include $(INCLUDE_DIR)/package.mk
 
@@ -53,7 +53,9 @@ define Package/dropbear
   CATEGORY:=Base system
   TITLE:=Small SSH2 client/server
   DEPENDS:= +DROPBEAR_ZLIB:zlib
-  ALTERNATIVES:=100:/usr/bin/scp:/usr/sbin/dropbear
+  ALTERNATIVES:=
+  $(if $(CONFIG_DROPBEAR_SCP),ALTERNATIVES+= \
+	  100:/usr/bin/scp:/usr/sbin/dropbear,)
   $(if $(CONFIG_DROPBEAR_DBCLIENT),ALTERNATIVES+= \
 	  100:/usr/bin/ssh:/usr/sbin/dropbear,)
 
@@ -149,7 +151,7 @@ endef
 define Build/Compile
 	+$(MAKE) $(PKG_JOBS) -C $(PKG_BUILD_DIR) \
 		$(TARGET_CONFIGURE_OPTS) \
-		PROGRAMS="dropbear $(if $(CONFIG_DROPBEAR_DBCLIENT),dbclient,) dropbearkey scp" \
+		PROGRAMS="dropbear $(if $(CONFIG_DROPBEAR_DBCLIENT),dbclient,) dropbearkey $(if $(CONFIG_DROPBEAR_SCP),scp,)" \
 		MULTI=1 SCPPROGRESS=1
 	+$(MAKE) $(PKG_JOBS) -C $(PKG_BUILD_DIR) \
 		$(TARGET_CONFIGURE_OPTS) \
-- 
2.27.0