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authorRichard W.M. Jones <rjones@redhat.com>2009-04-23 14:39:18 +0100
committerRichard W.M. Jones <rjones@redhat.com>2009-04-23 14:39:18 +0100
commit713283f4a67b3a1960ca96ce6608d046fc202d2d (patch)
tree41cf0eb6730b23563eaddf2c18606c02c47cb153
parent81d4a01ac03bc2996eea1ca4cc3182e50d21e6ba (diff)
downloadlibguestfs-713283f4a67b3a1960ca96ce6608d046fc202d2d.tar.gz
libguestfs-713283f4a67b3a1960ca96ce6608d046fc202d2d.tar.xz
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Add outline of 'debug' command.
-rw-r--r--daemon/Makefile.am1
-rw-r--r--daemon/configure.ac6
-rw-r--r--daemon/debug.c138
-rw-r--r--libguestfs.spec.in1
-rwxr-xr-xsrc/generator.ml12
5 files changed, 158 insertions, 0 deletions
diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index 4f7ce24d..1f517c21 100644
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -25,6 +25,7 @@ guestfsd_SOURCES = \
checksum.c \
command.c \
daemon.h \
+ debug.c \
devsparts.c \
dir.c \
file.c \
diff --git a/daemon/configure.ac b/daemon/configure.ac
index 0bd37b0b..e8aebc96 100644
--- a/daemon/configure.ac
+++ b/daemon/configure.ac
@@ -27,6 +27,12 @@ AC_ARG_ENABLE([32bit],
[export CC="gcc -m32"],
[enable_32bit=no])
+dnl Enable 'debug' command.
+AC_ARG_ENABLE([debug-command],
+ [AS_HELP_STRING([--enable-debug-command], [enable the 'debug' command])],
+ [AC_DEFINE_UNQUOTED([ENABLE_DEBUG_COMMAND],[1],[Enable the 'debug' command])],
+ [])
+
dnl Check for basic C environment.
AC_PROG_CC
AC_PROG_INSTALL
diff --git a/daemon/debug.c b/daemon/debug.c
new file mode 100644
index 00000000..22baa9bf
--- /dev/null
+++ b/daemon/debug.c
@@ -0,0 +1,138 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "../src/guestfs_protocol.h"
+#include "daemon.h"
+#include "actions.h"
+
+/* This command exposes debugging information, internals and
+ * status. There is no comprehensive documentation for this
+ * command. You have to look at the source code in this file
+ * to find out what you can do.
+ *
+ * Commands always output a freeform string.
+ */
+
+#if ENABLE_DEBUG_COMMAND
+struct cmd {
+ const char *cmd;
+ char * (*f) (const char *subcmd, int argc, char *const *const argv);
+};
+
+static char *debug_help (const char *subcmd, int argc, char *const *const argv);
+#if 0
+static char *debug_fds (const char *subcmd, int argc, char *const *const argv);
+static char *debug_free (const char *subcmd, int argc, char *const *const argv);
+static char *debug_mem (const char *subcmd, int argc, char *const *const argv);
+static char *debug_ps (const char *subcmd, int argc, char *const *const argv);
+#endif
+
+static struct cmd cmds[] = {
+ { "help", debug_help },
+#if 0
+ { "fds", debug_fds },
+ { "free", debug_free },
+ { "mem", debug_mem },
+ { "ps", debug_free },
+#endif
+ { NULL, NULL }
+};
+#endif
+
+char *
+do_debug (const char *subcmd, char *const *const argv)
+{
+#if ENABLE_DEBUG_COMMAND
+ int argc, i;
+
+ for (i = argc = 0; argv[i] != NULL; ++i)
+ argc++;
+
+ for (i = 0; cmds[i].cmd != NULL; ++i) {
+ if (strcasecmp (subcmd, cmds[i].cmd) == 0)
+ return cmds[i].f (subcmd, argc, argv);
+ }
+
+ reply_with_error ("use 'debug help' to list the supported commands");
+ return NULL;
+#else
+ reply_with_error ("guestfsd was not configured with --enable-debug-command");
+ return NULL;
+#endif
+}
+
+#if ENABLE_DEBUG_COMMAND
+static char *
+debug_help (const char *subcmd, int argc, char *const *const argv)
+{
+ int len, i;
+ char *r, *p;
+
+ r = strdup ("Commands supported:");
+ if (!r) {
+ reply_with_perror ("strdup");
+ return NULL;
+ }
+
+ len = strlen (r);
+ for (i = 0; cmds[i].cmd != NULL; ++i) {
+ len += strlen (cmds[i].cmd) + 1; /* space + new command */
+ p = realloc (r, len + 1); /* +1 for the final NUL */
+ if (p == NULL) {
+ reply_with_perror ("realloc");
+ free (r);
+ return NULL;
+ }
+ r = p;
+
+ strcat (r, " ");
+ strcat (r, cmds[i].cmd);
+ }
+
+ return r;
+}
+
+#if 0
+static char *
+debug_fds (const char *subcmd, int argc, char *const *const argv)
+{
+}
+
+static char *
+debug_free (const char *subcmd, int argc, char *const *const argv)
+{
+}
+
+static char *
+debug_mem (const char *subcmd, int argc, char *const *const argv)
+{
+}
+
+static char *
+debug_ps (const char *subcmd, int argc, char *const *const argv)
+{
+}
+#endif
+#endif /* ENABLE_DEBUG_COMMAND */
diff --git a/libguestfs.spec.in b/libguestfs.spec.in
index 5ba0b32d..7d369edb 100644
--- a/libguestfs.spec.in
+++ b/libguestfs.spec.in
@@ -232,6 +232,7 @@ popd
--prefix=%{_prefix} --libdir=%{_libdir} \
--with-java-home=%{java_home} \
--with-qemu="qemu-kvm qemu-system-%{_build_arch} qemu" \
+ --enable-debug-command \
%{extra}
# 'INSTALLDIRS' ensures that perl libs are installed in the vendor dir
diff --git a/src/generator.ml b/src/generator.ml
index 9f6ed778..d2be559e 100755
--- a/src/generator.ml
+++ b/src/generator.ml
@@ -1467,6 +1467,18 @@ This is the same as the C<guestfs_mount> command, but it
allows you to set both the mount options and the vfstype
as for the L<mount(8)> I<-o> and I<-t> flags.");
+ ("debug", (RString "result", [String "subcmd"; StringList "extraargs"]), 76, [],
+ [],
+ "debugging and internals",
+ "\
+The C<guestfs_debug> command exposes some internals of
+C<guestfsd> (the guestfs daemon) that runs inside the
+qemu subprocess.
+
+There is no comprehensive help for this command. You have
+to look at the file C<daemon/debug.c> in the libguestfs source
+to find out what you can do.");
+
]
let all_functions = non_daemon_functions @ daemon_functions