net: Kconfig: add CONFIG_WGET symbol

Let net/wget.c and net/lwip/wget.c depend on CONFIG_WGET, and
cmd/wget.c depend on CONFIG_CMD_WGET. This way, the wget code
can be used regardless of whether the wget command is available.

Signed-off-by: Adriano Cordova <adrianox@gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

cmd/Kconfig

@@ -2115,11 +2115,8 @@ config CMD_TFTPBOOT
 
 config CMD_WGET
 	bool "wget"
-	depends on CMD_NET
 	default y if SANDBOX
-	select PROT_TCP if NET
-	select PROT_TCP_LWIP if NET_LWIP
-	select PROT_DNS_LWIP if NET_LWIP
+	select WGET
 	help
 	  wget is a simple command to download kernel, or other files,
 	  from a http server over TCP.

net/Kconfig

@@ -244,6 +244,15 @@ config NET_RANDOM_ETHADDR
 	  generated. It will be saved to the appropriate environment variable,
 	  too.
 
+config WGET
+	bool "Enable wget"
+	select PROT_TCP if NET
+	select PROT_TCP_LWIP if NET_LWIP
+	select PROT_DNS_LWIP if NET_LWIP
+	help
+	  Selecting this will enable wget, an interface to send HTTP requests
+	  via the network stack.
+
 config TFTP_BLOCKSIZE
 	int "TFTP block size"
 	default 1468

net/Makefile

@@ -29,7 +29,7 @@ obj-$(CONFIG_$(PHASE_)TCP_FUNCTION_FASTBOOT)  += fastboot_tcp.o
 obj-$(CONFIG_CMD_WOL)  += wol.o
 obj-$(CONFIG_PROT_UDP) += udp.o
 obj-$(CONFIG_PROT_TCP) += tcp.o
-obj-$(CONFIG_CMD_WGET) += wget.o
+obj-$(CONFIG_WGET) += wget.o
 
 # Disable this warning as it is triggered by:
 # sprintf(buf, index ? "foo%d" : "foo", index)

net/lwip/Makefile

@@ -5,4 +5,4 @@ obj-$(CONFIG_CMD_DHCP) += dhcp.o
 obj-$(CONFIG_CMD_DNS) += dns.o
 obj-$(CONFIG_CMD_PING) += ping.o
 obj-$(CONFIG_CMD_TFTPBOOT) += tftp.o
-obj-$(CONFIG_CMD_WGET) += wget.o
+obj-$(CONFIG_WGET) += wget.o