For more information on the architecture of libguestfs,
see L<guestfs(3)>.");
+ ("set_trace", (RErr, [Bool "trace"]), -1, [FishAlias "trace"],
+ [InitNone, Always, TestOutputFalse (
+ [["set_trace"; "false"];
+ ["get_trace"]])],
+ "enable or disable command traces",
+ "\
+If the command trace flag is set to 1, then commands are
+printed on stdout before they are executed in a format
+which is very similar to the one used by guestfish. In
+other words, you can run a program with this enabled, and
+you will get out a script which you can feed to guestfish
+to perform the same set of actions.
+
+If you want to trace C API calls into libguestfs (and
+other libraries) then possibly a better way is to use
+the external ltrace(1) command.
+
+Command traces are disabled unless the environment variable
+C<LIBGUESTFS_TRACE> is defined and set to C<1>.");
+
+ ("get_trace", (RBool "trace", []), -1, [],
+ [],
+ "get command trace enabled flag",
+ "\
+Return the command trace flag.");
+
]
(* daemon_functions are any functions which cause some action
name style
) all_functions
+(* Generate the guestfs-internal-actions.h file. *)
+and generate_internal_actions_h () =
+ generate_header CStyle LGPLv2;
+ List.iter (
+ fun (shortname, style, _, _, _, _, _) ->
+ let name = "guestfs__" ^ shortname in
+ generate_prototype ~single_line:true ~newline:true ~handle:"handle"
+ name style
+ ) non_daemon_functions
+
(* Generate the client-side dispatch stubs. *)
and generate_client_actions () =
generate_header CStyle LGPLv2;
#include <stdlib.h>
#include \"guestfs.h\"
+#include \"guestfs-internal-actions.h\"
#include \"guestfs_protocol.h\"
#define error guestfs_error
";
+ (* Generate code to generate guestfish call traces. *)
+ let trace_call shortname style =
+ pr " if (guestfs__get_trace (g)) {\n";
+
+ let needs_i =
+ List.exists (function
+ | StringList _ | DeviceList _ -> true
+ | _ -> false) (snd style) in
+ if needs_i then (
+ pr " int i;\n";
+ pr "\n"
+ );
+
+ pr " printf (\"%s\");\n" shortname;
+ List.iter (
+ function
+ | String n (* strings *)
+ | Device n
+ | Pathname n
+ | Dev_or_Path n
+ | FileIn n
+ | FileOut n ->
+ (* guestfish doesn't support string escaping, so neither do we *)
+ pr " printf (\" \\\"%%s\\\"\", %s);\n" n
+ | OptString n -> (* string option *)
+ pr " if (%s) printf (\" \\\"%%s\\\"\", %s);\n" n n;
+ pr " else printf (\" null\");\n"
+ | StringList n
+ | DeviceList n -> (* string list *)
+ pr " putchar (' ');\n";
+ pr " putchar ('\"');\n";
+ pr " for (i = 0; %s[i]; ++i) {\n" n;
+ pr " if (i > 0) putchar (' ');\n";
+ pr " fputs (%s[i], stdout);\n" n;
+ pr " }\n";
+ pr " putchar ('\"');\n";
+ | Bool n -> (* boolean *)
+ pr " fputs (%s ? \" true\" : \" false\", stdout);\n" n
+ | Int n -> (* int *)
+ pr " printf (\" %%d\", %s);\n" n
+ ) (snd style);
+ pr " putchar ('\\n');\n";
+ pr " }\n";
+ pr "\n";
+ in
+
+ (* For non-daemon functions, generate a wrapper around each function. *)
+ List.iter (
+ fun (shortname, style, _, _, _, _, _) ->
+ let name = "guestfs_" ^ shortname in
+
+ generate_prototype ~extern:false ~semicolon:false ~newline:true
+ ~handle:"g" name style;
+ pr "{\n";
+ trace_call shortname style;
+ pr " return guestfs__%s " shortname;
+ generate_c_call_args ~handle:"g" style;
+ pr ";\n";
+ pr "}\n";
+ pr "\n"
+ ) non_daemon_functions;
+
(* Client-side stubs for each function. *)
List.iter (
fun (shortname, style, _, _, _, _, _) ->
pr " guestfs_main_loop *ml = guestfs_get_main_loop (g);\n";
pr " int serial;\n";
pr "\n";
+ trace_call shortname style;
pr " if (check_state (g, \"%s\") == -1) return %s;\n" name error_code;
pr " guestfs_set_busy (g);\n";
pr "\n";
pr " %s = strcmp (argv[%d], \"-\") != 0 ? argv[%d] : \"/dev/stdout\";\n"
name i i
| StringList name | DeviceList name ->
- pr " %s = parse_string_list (argv[%d]);\n" name i
+ pr " %s = parse_string_list (argv[%d]);\n" name i;
+ pr " if (%s == NULL) return -1;\n" name;
| Bool name ->
pr " %s = is_true (argv[%d]) ? 1 : 0;\n" name i
| Int name ->
#include <string.h>
#include \"guestfs.h\"
+#include \"guestfs-internal-actions.h\"
#include \"guestfs_protocol.h\"
#define error guestfs_error
let () =
let (name, style, _, _, _, _, _) = test0 in
generate_prototype ~extern:false ~semicolon:false ~newline:true
- ~handle:"g" ~prefix:"guestfs_" name style;
+ ~handle:"g" ~prefix:"guestfs__" name style;
pr "{\n";
List.iter (
function
if String.sub name (String.length name - 3) 3 <> "err" then (
pr "/* Test normal return. */\n";
generate_prototype ~extern:false ~semicolon:false ~newline:true
- ~handle:"g" ~prefix:"guestfs_" name style;
+ ~handle:"g" ~prefix:"guestfs__" name style;
pr "{\n";
(match fst style with
| RErr ->
) else (
pr "/* Test error return. */\n";
generate_prototype ~extern:false ~semicolon:false ~newline:true
- ~handle:"g" ~prefix:"guestfs_" name style;
+ ~handle:"g" ~prefix:"guestfs__" name style;
pr "{\n";
pr " error (g, \"error\");\n";
(match fst style with
generate_actions_h ();
close ();
+ let close = output_to "src/guestfs-internal-actions.h" in
+ generate_internal_actions_h ();
+ close ();
+
let close = output_to "src/guestfs-actions.c" in
generate_client_actions ();
close ();