Switch from a rake-based build to a make-based build.

This commit beefs up the Makefile to do the build, instead of the
Rakefile.

It also removes from the Rakefile the dependency on rake_utils, which
should mean it's ok to build in a schroot.

The files are reorganised to make the Makefile rules more tractable,
although the reorganisation reveals a problem with our current code
organisation.

The problem is that the proxy-specific code transitively depends on the
server code via flexnbd.h, which has a circular dependency on the server
and client structs. This should be broken in a future commit by
separating the flexnbd struct into a shared config struct and
server-specific parts, so that the server code can be moved into
src/server to more accurately show the functional dependencies.

src/common/mode.h

@@ -0,0 +1,94 @@
+#ifndef MODE_H
+#define MODE_H
+
+
+void mode(char* mode, int argc, char **argv);
+
+
+#include <getopt.h>
+
+#define GETOPT_ARG(x,s)  {(x), 1, 0, (s)}
+#define GETOPT_FLAG(x,v) {(x), 0, 0, (v)}
+
+#define OPT_HELP "help"
+#define OPT_ADDR "addr"
+#define OPT_BIND "bind"
+#define OPT_PORT "port"
+#define OPT_FILE "file"
+#define OPT_SOCK "sock"
+#define OPT_FROM "from"
+#define OPT_SIZE "size"
+#define OPT_DENY "default-deny"
+#define OPT_UNLINK "unlink"
+#define OPT_CONNECT_ADDR "conn-addr"
+#define OPT_CONNECT_PORT "conn-port"
+#define OPT_KILLSWITCH "killswitch"
+#define OPT_MAX_SPEED "max-speed"
+
+#define CMD_SERVE  "serve"
+#define CMD_LISTEN "listen"
+#define CMD_READ   "read"
+#define CMD_WRITE  "write"
+#define CMD_ACL    "acl"
+#define CMD_MIRROR "mirror"
+#define CMD_MIRROR_SPEED "mirror-speed"
+#define CMD_BREAK  "break"
+#define CMD_STATUS "status"
+#define CMD_HELP   "help"
+#define LEN_CMD_MAX 13
+
+#define PATH_LEN_MAX 1024
+#define ADDR_LEN_MAX 64
+
+
+#define IS_CMD(x,c) (strncmp((x),(c),(LEN_CMD_MAX)) == 0)
+
+#define GETOPT_HELP GETOPT_FLAG( OPT_HELP, 'h' )
+#define GETOPT_DENY GETOPT_FLAG( OPT_DENY, 'd' )
+#define GETOPT_ADDR GETOPT_ARG( OPT_ADDR, 'l' )
+#define GETOPT_PORT GETOPT_ARG( OPT_PORT, 'p' )
+#define GETOPT_FILE GETOPT_ARG( OPT_FILE, 'f' )
+#define GETOPT_SOCK GETOPT_ARG( OPT_SOCK, 's' )
+#define GETOPT_FROM GETOPT_ARG( OPT_FROM, 'F' )
+#define GETOPT_SIZE GETOPT_ARG( OPT_SIZE, 'S' )
+#define GETOPT_BIND GETOPT_ARG( OPT_BIND, 'b' )
+#define GETOPT_UNLINK GETOPT_ARG( OPT_UNLINK, 'u' )
+#define GETOPT_CONNECT_ADDR GETOPT_ARG( OPT_CONNECT_ADDR, 'C' )
+#define GETOPT_CONNECT_PORT GETOPT_ARG( OPT_CONNECT_PORT, 'P' )
+#define GETOPT_KILLSWITCH   GETOPT_ARG( OPT_KILLSWITCH,   'k' )
+#define GETOPT_MAX_SPEED    GETOPT_ARG( OPT_MAX_SPEED, 'm' )
+
+#define OPT_VERBOSE "verbose"
+#define SOPT_VERBOSE "v"
+#define GETOPT_VERBOSE GETOPT_FLAG( OPT_VERBOSE, 'v' )
+#define VERBOSE_LINE \
+  "\t--" OPT_VERBOSE ",-" SOPT_VERBOSE "\t\tOutput debug information.\n"
+
+#ifdef DEBUG
+# define VERBOSE_LOG_LEVEL 0
+#else
+# define VERBOSE_LOG_LEVEL 1
+#endif
+
+#define QUIET_LOG_LEVEL 4
+
+#define OPT_QUIET "quiet"
+#define SOPT_QUIET "q"
+#define GETOPT_QUIET GETOPT_FLAG( OPT_QUIET, 'q' )
+#define QUIET_LINE \
+	"\t--" OPT_QUIET ",-" SOPT_QUIET "\t\tOutput only fatal information.\n"
+
+
+#define HELP_LINE \
+	"\t--" OPT_HELP  ",-h       \tThis text.\n"
+#define SOCK_LINE \
+	"\t--" OPT_SOCK  ",-s <SOCK>\tPath to the control socket.\n"
+#define BIND_LINE \
+	 "\t--" OPT_BIND ",-b <BIND-ADDR>\tBind the local socket to a particular IP address.\n"
+#define MAX_SPEED_LINE \
+	 "\t--" OPT_MAX_SPEED ",-m <bps>\tMaximum speed of the migration, in bytes/sec.\n"
+
+char * help_help_text;
+
+#endif
+