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[libvirt] [PATCH V1 2/4] src/xenconfig: Xen-xl parser



Introduce a xen xl parser

This parser allows for users to convert the new xl disk format and
spice graphics config to libvirt xml format and vice versa.Regarding
the spice graphics config, the code is pretty much straight forward
For the disk {formating, parsing} this parser takes care of the new
xl format which include positional parameters and key/value parameters
In xl format disk config a <diskspec> consists of parameters separated by
commas.If the parameters do not contain an '=' they are automatically
assigned to certain options following the order below

   target, format, vdev, access

The above are the only mandatory parameters in the <diskspec> but there
are many more disk config options.This options can be specified as
key=value pairs This takes care of the rest of the options such as

  devtype, backend, backendtype, script, direct-io-safe,

The positional paramters can also be specified in key/value form
for example

    /dev/vg/guest-volume,,hda
    /dev/vg/guest-volume,raw,hda,rw
    format=raw, vdev=hda, access=rw, target=/dev/vg/guest-volume

are interpleted to one config

In xm format a config equivalent to the one about would have been

raw:/dev/vg/guest-volume,hda,w

As of this commit, libvirt can not convert xl disk config such as

/dev/vg/guest-volume,,hda

to libvirt xml

  <disk type='block' device='disk'>
    <driver name='qemu' type='raw'/>
    <source file=/dev/vg/guest-volume/>
    <target dev='hdc' bus='ide'/>
 </disk>

Signed-off-by: Kiarie Kahurani <davidkiarie4 gmail com>
---
 configure.ac                  |   5 +-
 src/Makefile.am               |  21 +-
 src/libvirt_xenconfig.syms    |   4 +
 src/xenconfig/libxlu_disk_i.h |  28 +++
 src/xenconfig/libxlu_disk_l.l | 292 ++++++++++++++++++++++++++
 src/xenconfig/xen_common.c    |   3 +-
 src/xenconfig/xen_xl.c        | 476 ++++++++++++++++++++++++++++++++++++++++++
 src/xenconfig/xen_xl.h        |  29 +++
 8 files changed, 852 insertions(+), 6 deletions(-)
 create mode 100644 src/xenconfig/libxlu_disk_i.h
 create mode 100644 src/xenconfig/libxlu_disk_l.l
 create mode 100644 src/xenconfig/xen_xl.c
 create mode 100644 src/xenconfig/xen_xl.h

diff --git a/configure.ac b/configure.ac
index f93c6c2..a60d0ad 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2176,7 +2176,10 @@ AC_PATH_PROG([PERL], [perl])
 if test -z "$PERL"; then
          AC_MSG_ERROR([Failed to find perl.])
 fi
-
+AC_PATH_PROG([FLEX], [flex])
+if test -z "$FLEX"; then
+         AC_MSG_ERROR([failed to find flex.])
+fi
 AC_ARG_WITH([test-suite],
             [AS_HELP_STRING([--with-test-suite],
                [build test suite by default @<:@default=check@:>@])],
diff --git a/src/Makefile.am b/src/Makefile.am
index 46e411e..38560ce 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -35,7 +35,6 @@ INCLUDES =	-I../gnulib/lib					\
 		$(GETTEXT_CPPFLAGS)
 
 AM_CFLAGS =	$(LIBXML_CFLAGS)				\
-		$(WARN_CFLAGS)					\
 		$(LOCK_CHECKING_CFLAGS)				\
 		$(WIN32_EXTRA_CFLAGS)				\
 		$(COVERAGE_CFLAGS)
@@ -964,11 +963,25 @@ CPU_SOURCES =							\
 VMX_SOURCES =							\
 		vmx/vmx.c vmx/vmx.h
 
+XENCONFIG_GENERATED =                                           \
+		xenconfig/libxlu_disk_l.c                       \
+                xenconfig/libxlu_disk_l.h
+
+$(XENCONFIG_GENERATED): $(srcdir)/xenconfig/libxlu_disk_l.l     \
+	    $(srcdir)/xenconfig/libxlu_disk_i.h Makefile.am
+	$(AM_V_GEN)$(FLEX) --outfile=$(srcdir)/xenconfig/libxlu_disk_l.c            \
+		--header-file=$(srcdir)/xenconfig/libxlu_disk_l.h \
+		$(srcdir)/xenconfig/libxlu_disk_l.l
+
+CLEANFILES += $(XENCONFIG_GENERATED)
+
 XENCONFIG_SOURCES =						\
 		xenconfig/xenxs_private.h			\
-		xenconfig/xen_common.c xenconfig/xen_common.h   \
-		xenconfig/xen_sxpr.c xenconfig/xen_sxpr.h	\
-		xenconfig/xen_xm.c xenconfig/xen_xm.h
+		xenconfig/xen_common.c xenconfig/xen_common.h  \
+		xenconfig/xen_sxpr.c xenconfig/xen_sxpr.h	 \
+		xenconfig/xen_xm.c xenconfig/xen_xm.h           \
+		xenconfig/xen_xl.c xenconfig/xen_xl.h           \
+		$(XENCONFIG_GENERATED)
 
 pkgdata_DATA =	cpu/cpu_map.xml
 
diff --git a/src/libvirt_xenconfig.syms b/src/libvirt_xenconfig.syms
index 6541685..3e2e5d6 100644
--- a/src/libvirt_xenconfig.syms
+++ b/src/libvirt_xenconfig.syms
@@ -16,6 +16,10 @@ xenParseSxprChar;
 xenParseSxprSound;
 xenParseSxprString;
 
+#xenconfig/xen_xl.h
+xenFormatXL;
+xenParseXL;
+
 # xenconfig/xen_xm.h
 xenFormatXM;
 xenParseXM;
diff --git a/src/xenconfig/libxlu_disk_i.h b/src/xenconfig/libxlu_disk_i.h
new file mode 100644
index 0000000..911ea42
--- /dev/null
+++ b/src/xenconfig/libxlu_disk_i.h
@@ -0,0 +1,28 @@
+#ifndef LIBXLU_DISK_I_H
+#define LIBXLU_DISK_I_H
+
+#include "../util/virconf.h"
+
+typedef struct {
+    virConfPtr conf;
+    int err;
+    void *scanner;
+    YY_BUFFER_STATE buf;
+    virDomainDiskDefPtr disk;
+    int access_set, had_depr_prefix;
+    const char *spec;
+} DiskParseContext;
+
+void xlu__disk_err(DiskParseContext *dpc, const char *erroneous,
+                   const char *message);
+
+
+#endif /*LIBXLU_DISK_I_H*/
+
+/*
+ * Local variables:
+ * mode: C
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/src/xenconfig/libxlu_disk_l.l b/src/xenconfig/libxlu_disk_l.l
new file mode 100644
index 0000000..7b6893b
--- /dev/null
+++ b/src/xenconfig/libxlu_disk_l.l
@@ -0,0 +1,292 @@
+/* -*- fundamental -*- */
+/*
+ * libxlu_disk_l.l - parser for disk specification strings
+ *
+ * Copyright (C) 2011      Citrix Ltd.
+ * Author Ian Jackson <ian jackson eu citrix com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; version 2.1 only. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * 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 Lesser General Public License for more details.
+ */
+
+/*
+ * Parsing the old xm/xend/xl-4.1 disk specs is a tricky problem,
+ * because the target string might in theory contain "," which is the
+ * delimiter we use for stripping off things on the RHS, and ":",
+ * which is the delimiter we use for stripping off things on the LHS.
+ *
+ * In this parser we do not support such target strings in the old
+ * syntax; if the target string has to contain "," or ":" the new
+ * syntax's "target=" should be used.
+ */
+%{
+# include <config.h>
+# include <stdio.h>
+# include <stdarg.h>
+# include "virstring.h"
+# include "virstoragefile.h"
+# include "viralloc.h"
+# include "virconf.h"
+# include "domain_conf.h"
+# include "viralloc.h"
+# include "virstring.h"
+# include "xen_xl.h"
+# include "libxlu_disk_i.h"
+# include "libxlu_disk_i.h"
+
+#define YY_NO_INPUT
+#define VIR_FROM_THIS VIR_FROM_NONE
+
+/* Some versions of flex have a bug (Fedora bugzilla 612465) which causes
+ * it to fail to declare these functions, which it defines.  So declare
+ * them ourselves.  Hopefully we won't have to simultaneously support
+ * a flex version which declares these differently somehow. */
+int xlu__disk_yyget_column(yyscan_t yyscanner);
+void xlu__disk_yyset_column(int  column_no, yyscan_t yyscanner);
+
+
+/*----- useful macros and functions used in actions -----
+ * we use macros in the actual rules to keep the actions short
+ * and particularly to avoid repeating boilerplate values such as
+ * DPC->disk, yytext, etc. */
+
+/* For actions whose patterns contain '=', finds the start of the value */
+#define FROMEQUALS (strchr(yytext,'=')+1)
+
+/* Chops the delimiter off, modifying yytext and yyleng. */
+#define STRIP(delim) do{                                                \
+	if (yyleng>0 && yytext[yyleng-1]==(delim))                      \
+	    yytext[--yyleng] = 0;                                       \
+    }while(0)
+
+/* Sets a string value, checking it hasn't been set already. */
+#define SAVESTRING(what,loc,val) do{					\
+	savestring(DPC, what " respecified", &DPC->disk->loc, (val));	\
+    }while(0)
+
+int
+asprintf(char **ret, const char *format, ...)
+{
+    va_list ap;
+
+    *ret = NULL;  /* Ensure value can be passed to free() */
+
+    va_start(ap, format);
+    int count = vsnprintf(NULL, 0, format, ap);
+    va_end(ap);
+
+    if (count >= 0)
+    {
+        char* buffer = malloc(count + 1);
+        if (buffer == NULL)
+            return -1;
+
+        va_start(ap, format);
+        count = vsnprintf(buffer, count + 1, format, ap);
+        va_end(ap);
+
+        if (count < 0)
+        {
+            free(buffer);
+            return count;
+        }
+        *ret = buffer;
+    }
+
+    return count;
+}
+
+
+static void
+savestring(DiskParseContext *dpc,
+           const char *what_respecified,
+           char **update,
+           const char *value)
+{
+    if (*update) {
+        if (**update) {
+            xlu__disk_err(dpc, value, what_respecified);
+            return;
+        }
+
+        free(*update); /* do not complain about overwriting empty strings */
+    }
+
+    *update = strdup(value);
+}
+
+#define DPC dpc /* our convention in lexer helper functions */
+
+/* Sets ->readwrite from the string.  This ought to be an enum, perhaps. */
+static void
+setaccess(DiskParseContext *dpc, const char *str)
+{
+    if (STREQ(str, "r") || STREQ(str, "ro")) {
+        dpc->disk->src->readonly = 1;
+    } else if (STREQ(str, "w!") || STREQ(str, "!")) {
+	dpc->disk->src->shared = 1;
+    } else {
+	xlu__disk_err(dpc,str,"unknown value for access");
+    }
+}
+
+/* Sets ->format from the string.  IDL should provide something for this. */
+static void
+setformat(DiskParseContext *dpc, const char *str)
+{
+    if (STREQ(str, ""))
+        virDomainDiskSetFormat(dpc->disk, VIR_STORAGE_FILE_RAW);
+    else if (STREQ(str, "raw"))
+        virDomainDiskSetFormat(dpc->disk, VIR_STORAGE_FILE_RAW);
+    else if (STREQ(str, "qcow"))
+        virDomainDiskSetFormat(dpc->disk, VIR_STORAGE_FILE_QCOW);
+    else if (STREQ(str, "qcow2"))
+        virDomainDiskSetFormat(dpc->disk, VIR_STORAGE_FILE_QCOW2);
+    else if (STREQ(str, "vhd"))
+        virDomainDiskSetFormat(dpc->disk, VIR_STORAGE_FILE_VHD);
+    else xlu__disk_err(dpc, str, "unknown value for format");
+}
+
+
+/* Sets ->backend from the string.  IDL should provide something for this. */
+static void
+setdrivertype(DiskParseContext *dpc, const char *str)
+{
+    if (STREQ(str, "phy"))
+        ignore_value(virDomainDiskSetDriver(dpc->disk, "phy"));
+    else if (STREQ(str, "tap"))
+        ignore_value(virDomainDiskSetDriver(dpc->disk, "tap"));
+    else if (STREQ(str, "qdisk"))
+        ignore_value(virDomainDiskSetDriver(dpc->disk, "qemu"));
+    else if (STREQ(str, ""))
+        ignore_value(virDomainDiskSetDriver(dpc->disk, "phy"));
+    else
+        xlu__disk_err(dpc, str, "unknown value for backendtype");
+}
+
+
+/* Handles a vdev positional parameter which includes a devtype. */
+static int
+vdev_and_devtype(DiskParseContext *dpc, char *str)
+{
+    /* returns 1 if it was <vdev>:<devtype>, 0 (doing nothing) otherwise */
+    char *colon = strrchr(str, ':');
+    if (!colon)
+        return 0;
+
+    *colon++ = 0;
+    SAVESTRING("vdev", dst, str);
+
+    if (STREQ(colon,"cdrom")) {
+        DPC->disk->device = VIR_DOMAIN_DISK_DEVICE_CDROM;
+    } else if (STREQ(colon, "disk")) {
+        DPC->disk->device = VIR_DOMAIN_DISK_DEVICE_DISK;
+    } else {
+        xlu__disk_err(DPC, colon, "unknown deprecated type");
+    }
+    return 1;
+}
+
+#undef DPC /* needs to be defined differently the actual lexer */
+#define DPC ((DiskParseContext*)yyextra)
+
+%}
+
+%option warn
+%option nodefault
+%option batch
+%option 8bit
+%option noyywrap
+%option reentrant
+%option prefix="xlu__disk_yy"
+%option nounput
+
+%x LEXERR
+
+%%
+
+ /*----- the scanner rules which do the parsing -----*/
+
+[ \t\n]+/([^ \t\n].*)? { /* ignore whitespace before parameters */ }
+
+ /* ordinary parameters setting enums or strings */
+
+format=[^,]*,?	{ STRIP(','); setformat(DPC, FROMEQUALS); }
+
+cdrom,?		{ DPC->disk->device = VIR_DOMAIN_DISK_DEVICE_CDROM; }
+devtype=cdrom,?	{ DPC->disk->device = VIR_DOMAIN_DISK_DEVICE_CDROM; }
+devtype=disk,?	{ DPC->disk->device = VIR_DOMAIN_DISK_DEVICE_DISK; }
+devtype=[^,]*,?	{ xlu__disk_err(DPC, yytext,"unknown value for type"); }
+
+access=[^,]*,?	{ STRIP(','); setaccess(DPC, FROMEQUALS); }
+backendtype=[^,]*,? { STRIP(','); setdrivertype(DPC, FROMEQUALS); }
+
+vdev=[^,]*,?	{ STRIP(','); SAVESTRING("vdev", dst, FROMEQUALS); }
+
+ /* the target magic parameter, eats the rest of the string */
+
+target=.*	{ STRIP(','); SAVESTRING("target", src->path, FROMEQUALS); }
+
+ /* unknown parameters */
+
+[a-z][-a-z0-9]*=[^,],? { xlu__disk_err(DPC, yytext, "unknown parameter"); }
+
+  /* the "/.*" in these patterns ensures that they count as if they
+   * matched the whole string, so these patterns take precedence */
+
+(raw|qcow2?|vhd):/.* {
+                    STRIP(':');
+                    DPC->had_depr_prefix=1;
+                    setformat(DPC, yytext);
+                 }
+
+tapdisk:/.*	{ DPC->had_depr_prefix=1; }
+tap2?:/.*	{ DPC->had_depr_prefix=1; }
+aio:/.*		{ DPC->had_depr_prefix=1; }
+ioemu:/.*	{ DPC->had_depr_prefix=1; }
+file:/.*	{ DPC->had_depr_prefix=1; }
+phy:/.*		{ DPC->had_depr_prefix=1; }
+[a-z][a-z0-9]*:/([^a-z0-9].*)? {
+		  xlu__disk_err(DPC, yytext, "unknown deprecated disk prefix");
+		  return 0;
+		}
+
+ /* positional parameters */
+
+[^=,]*,|[^=,]+,?  {
+    STRIP(',');
+
+    if (DPC->err) {
+        /* previous errors may just lead to subsequent ones */
+    } else if (!DPC->disk->src->path) {
+        SAVESTRING("target", src->path, yytext);
+    } else if (DPC->disk->src->format == VIR_STORAGE_FILE_LAST){
+        setformat(DPC, yytext);
+    }
+     else if (!DPC->disk->dst) {
+        if (!vdev_and_devtype(DPC, yytext))
+            SAVESTRING("vdev", dst, yytext);
+    } else if (!DPC->access_set) {
+        DPC->access_set = 1;
+        setaccess(DPC, yytext);
+    } else {
+        xlu__disk_err(DPC, yytext, "too many positional parameters");
+        return 0; /* don't print any more errors */
+    }
+}
+
+. {
+    BEGIN(LEXERR);
+    yymore();
+}
+<LEXERR>.* {
+    xlu__disk_err(DPC, yytext, "bad disk syntax");
+    return 0;
+}
diff --git a/src/xenconfig/xen_common.c b/src/xenconfig/xen_common.c
index d71dd07..3949b37 100644
--- a/src/xenconfig/xen_common.c
+++ b/src/xenconfig/xen_common.c
@@ -1804,7 +1804,8 @@ xenFormatVfb(virConfPtr conf, virDomainDefPtr def, int xendConfigVersion)
 {
     int hvm = STREQ(def->os.type, "hvm") ? 1 : 0;
 
-    if (def->ngraphics == 1) {
+    if (def->ngraphics == 1 &&
+        def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE) {
         if (hvm || (xendConfigVersion < XEND_CONFIG_MIN_VERS_PVFB_NEWCONF)) {
             if (def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_SDL) {
                 if (xenConfigSetInt(conf, "sdl", 1) < 0)
diff --git a/src/xenconfig/xen_xl.c b/src/xenconfig/xen_xl.c
new file mode 100644
index 0000000..f491958
--- /dev/null
+++ b/src/xenconfig/xen_xl.c
@@ -0,0 +1,476 @@
+/*
+ * xen_xl.c: Xen XL parsing functions
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Author: Kiarie Kahurani <davidkiarie4 gmail com>
+ */
+#include <config.h>
+#include <assert.h>
+#include "virconf.h"
+#include "virerror.h"
+#include "domain_conf.h"
+#include "viralloc.h"
+#include "virstring.h"
+#include "xen_xl.h"
+#include "libxlu_disk_l.h"
+#include "libxlu_disk_i.h"
+
+#define VIR_FROM_THIS VIR_FROM_NONE
+
+static int
+xenParseXLSpice(virConfPtr conf, virDomainDefPtr def)
+{
+    virDomainGraphicsDefPtr graphics = NULL;
+    unsigned long port;
+    char *listenAddr = NULL;
+    int val;
+
+    if (STREQ(def->os.type, "hvm")) {
+        if (xenConfigGetBool(conf, "spice", &val, 0) < 0)
+            return -1;
+
+        if (val) {
+            if (VIR_ALLOC(graphics) < 0)
+                return -1;
+
+            graphics->type = VIR_DOMAIN_GRAPHICS_TYPE_SPICE;
+            if (xenConfigCopyStringOpt(conf, "spicehost", &listenAddr) < 0)
+                goto cleanup;
+            if (listenAddr &&
+                virDomainGraphicsListenSetAddress(graphics, 0, listenAddr,
+                                                  -1, true) < 0) {
+                goto cleanup;
+            }
+            VIR_FREE(listenAddr);
+
+            if (xenConfigGetULong(conf, "spicetls_port", &port, 0) < 0)
+                goto cleanup;
+            graphics->data.spice.tlsPort = (int)port;
+
+            if (xenConfigGetULong(conf, "spiceport", &port, 0) < 0)
+                goto cleanup;
+
+            graphics->data.spice.port = (int)port;
+
+            if (!graphics->data.spice.tlsPort &&
+                !graphics->data.spice.port)
+            graphics->data.spice.autoport = 1;
+
+            if (xenConfigGetBool(conf, "spicedisable_ticketing", &val, 0) < 0)
+                goto cleanup;
+            if (val) {
+                if (xenConfigCopyStringOpt(conf, "spicepasswd",
+                                           &graphics->data.spice.auth.passwd) < 0)
+                    goto cleanup;
+            }
+
+            if (xenConfigGetBool(conf, "spiceagent_mouse",
+                                 &graphics->data.spice.mousemode, 0) < 0)
+                goto cleanup;
+            if (xenConfigGetBool(conf, "spicedvagent", &val, 0) < 0)
+                goto cleanup;
+            if (val) {
+                if (xenConfigGetBool(conf, "spice_clipboard_sharing",
+                                     &graphics->data.spice.copypaste,
+                                     0) < 0)
+                    goto cleanup;
+            }
+
+            if (VIR_ALLOC_N(def->graphics, 1) < 0)
+                goto cleanup;
+            def->graphics[0] = graphics;
+            def->ngraphics = 1;
+        }
+    }
+
+    return 0;
+
+ cleanup:
+    virDomainGraphicsDefFree(graphics);
+    return -1;
+}
+
+
+
+void
+xlu__disk_err(DiskParseContext *dpc,
+                   const char *erroneous,
+                   const char *message)
+{
+    /*virReportError(VIR_ERR_INTERNAL_ERROR,
+            "%s: config parsing error in disk specification: %s"
+            "%s%s"
+            " in `%s'\n",
+            message,
+            erroneous?": near `":"", erroneous?erroneous:"", erroneous?"'":"",
+            dpc->spec);
+    if (!dpc->err)
+        dpc->err= EINVAL;
+        */
+}
+
+
+static int
+dpc_prep(DiskParseContext *dpc, const char *spec)
+{
+    int e;
+    dpc->spec = spec;
+
+    e = xlu__disk_yylex_init_extra(dpc, &dpc->scanner);
+    if (e)
+        goto fail;
+
+    dpc->buf = xlu__disk_yy_scan_bytes(spec, strlen(spec), dpc->scanner);
+    if (!dpc->buf) {
+        e = ENOMEM;
+        goto fail;
+    }
+
+    return 0;
+
+ fail:
+    virReportError(VIR_ERR_INTERNAL_ERROR, "cannot init disk scanner: %s\n",
+                   strerror(errno));
+    return e;
+}
+
+
+static void
+dpc_dispose(DiskParseContext *dpc)
+{
+    virDomainDiskDefFree(dpc->disk);
+
+    if (dpc->buf) {
+        xlu__disk_yy_delete_buffer(dpc->buf, dpc->scanner);
+        dpc->buf = 0;
+    }
+    if (dpc->scanner) {
+        xlu__disk_yylex_destroy(dpc->scanner);
+        dpc->scanner = 0;
+    }
+}
+
+/*
+ * positional parameters
+ *     (If the <diskspec> strings are not separated by "="
+ *     the  string is split following ',' and assigned to
+ *     the following options in the following order)
+ *     target,format,vdev,access
+ * ================================================================
+ *
+ * The parameters below cannot be specified as positional parameters:
+ *
+ * other parameters
+ *    devtype = <devtype>
+ *    backendtype = <backend-type>
+ * parameters not taken care of
+ *    backend = <domain-name>
+ *    script = <script>
+ *    direct-io-safe
+ *
+ * ================================================================
+ * The parser does not take any deprecated parameters
+ *
+ * For more information refer to /xen/docs/misc/xl-disk-configuration.txt
+ */
+static int
+xenParseXLDisk(virConfPtr conf, virDomainDefPtr def)
+{
+    int e;
+    DiskParseContext dpc;
+
+    virConfValuePtr list = virConfGetValue(conf, "disk");
+    dpc.conf = conf;
+    dpc.scanner = 0;
+    memset(&dpc, 0, sizeof(dpc));
+
+    if (list && list->type == VIR_CONF_LIST) {
+        list = list->list;
+        while (list) {
+            char *specs = list->str;
+            dpc.spec = specs;
+
+            if ((list->type != VIR_CONF_STRING) || (list->str == NULL))
+                goto skipdisk;
+
+            if (!(dpc.disk = virDomainDiskDefNew()))
+                    return -1;
+            dpc.disk->src->readonly = 0;
+            dpc.disk->src->format = VIR_STORAGE_FILE_LAST;
+
+            e = dpc_prep(&dpc, specs);
+            if (e) {
+                dpc.err = e;
+            }
+            xlu__disk_yylex(dpc.scanner);
+
+            if (dpc.err) {
+                dpc_dispose(&dpc);
+            }
+            if (dpc.disk->src->format == VIR_STORAGE_FILE_LAST) {
+                dpc.disk->src->format = VIR_STORAGE_FILE_RAW;
+            }
+
+            if (dpc.disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM) {
+                dpc.disk->removable = true;
+                dpc.disk->src->readonly = true;
+                if (!dpc.disk->src->path || STREQ(dpc.disk->src->path, ""))
+                    dpc.disk->src->format = VIR_STORAGE_FILE_NONE;
+            }
+
+            if (STRPREFIX(dpc.disk->dst, "xvd") || !STREQ(def->os.type, "hvm")) {
+                dpc.disk->bus = VIR_DOMAIN_DISK_BUS_XEN;
+            } else if (STRPREFIX(dpc.disk->dst, "sd")) {
+                dpc.disk->bus = VIR_DOMAIN_DISK_BUS_SCSI;
+            } else {
+                dpc.disk->bus = VIR_DOMAIN_DISK_BUS_IDE;
+            }
+
+            virDomainDiskSetType(dpc.disk, STREQ(virDomainDiskGetDriver(dpc.disk), "phy") ?
+                                             VIR_STORAGE_TYPE_BLOCK :
+                                             VIR_STORAGE_TYPE_FILE);
+            if (VIR_APPEND_ELEMENT(def->disks, def->ndisks, dpc.disk) < 0)
+                return -1;
+skipdisk:
+        list = list->next;
+        virDomainDiskDefFree(dpc.disk);
+        dpc.disk = NULL;
+        }
+
+    }
+    return 0;
+}
+
+
+virDomainDefPtr
+xenParseXL(virConfPtr conf, virCapsPtr caps,
+           int xendConfigVersion)
+{
+    virDomainDefPtr def = NULL;
+
+    if (VIR_ALLOC(def) < 0)
+        return NULL;
+
+    def->virtType = VIR_DOMAIN_VIRT_XEN;
+    def->id = -1;
+
+    if (xenParseConfigCommon(conf, def, caps, xendConfigVersion) < 0)
+        goto cleanup;
+
+    if (xenParseXLDisk(conf, def) < 0)
+        goto cleanup;
+
+    if (xenParseXLSpice(conf, def) < 0)
+        goto cleanup;
+
+    return def;
+
+ cleanup:
+    virDomainDefFree(def);
+    return NULL;
+}
+
+
+static int
+xenFormatXLDisk(virConfValuePtr list, virDomainDiskDefPtr disk)
+{
+    virBuffer buf = VIR_BUFFER_INITIALIZER;
+    virConfValuePtr val, tmp;
+    const char *src = virDomainDiskGetSource(disk);
+    int format = virDomainDiskGetFormat(disk);
+
+    /* target */
+    virBufferAsprintf(&buf, "%s,", src);
+    /* format */
+    switch (format) {
+        case VIR_STORAGE_FILE_RAW:
+            virBufferAddLit(&buf, "raw,");
+            break;
+        case VIR_STORAGE_FILE_VHD:
+            virBufferAddLit(&buf, "xvhd,");
+            break;
+        case VIR_STORAGE_FILE_QCOW:
+            virBufferAddLit(&buf, "qcow,");
+            break;
+        case VIR_STORAGE_FILE_QCOW2:
+            virBufferAddLit(&buf, "qcow2,");
+            break;
+      /* set default */
+        default:
+            virBufferAddLit(&buf, "raw,");
+    }
+
+    /* device */
+    virBufferAdd(&buf, disk->dst, -1);
+
+    virBufferAddLit(&buf, ",");
+
+    if (disk->src->readonly)
+        virBufferAddLit(&buf, "r,");
+    else if (disk->src->shared)
+        virBufferAddLit(&buf, "!,");
+    else
+        virBufferAddLit(&buf, "w,");
+    if (disk->transient) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("transient disks not supported yet"));
+        goto cleanup;
+    }
+
+    if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM)
+        virBufferAddLit(&buf, "cdrom");
+
+    if (virBufferCheckError(&buf) < 0)
+        goto cleanup;
+
+    if (VIR_ALLOC(val) < 0)
+        goto cleanup;
+
+    val->type = VIR_CONF_STRING;
+    val->str = virBufferContentAndReset(&buf);
+    tmp = list->list;
+    while (tmp && tmp->next)
+        tmp = tmp->next;
+    if (tmp)
+        tmp->next = val;
+    else
+        list->list = val;
+    return 0;
+
+ cleanup:
+    virBufferFreeAndReset(&buf);
+    return -1;
+}
+
+
+static int
+xenFormatXLDomainDisks(virConfPtr conf, virDomainDefPtr def)
+{
+    virConfValuePtr diskVal = NULL;
+    size_t i = 0;
+
+    if (VIR_ALLOC(diskVal) < 0)
+        return -1;
+
+    diskVal->type = VIR_CONF_LIST;
+    diskVal->list = NULL;
+
+    for (i = 0; i < def->ndisks; i++) {
+        if (def->disks[i]->device == VIR_DOMAIN_DISK_DEVICE_FLOPPY)
+            continue;
+        if (xenFormatXLDisk(diskVal, def->disks[i]) < 0)
+
+                goto cleanup;
+    }
+
+    if (diskVal->list != NULL) {
+        int ret = virConfSetValue(conf, "disk", diskVal);
+        diskVal = NULL;
+        if (ret < 0)
+            goto cleanup;
+    }
+
+    return 0;
+
+ cleanup:
+    virConfFreeValue(diskVal);
+    return 0;
+}
+
+
+static int
+xenFormatXLSpice(virConfPtr conf, virDomainDefPtr def)
+{
+    const char *listenAddr = NULL;
+
+    if (STREQ(def->os.type, "hvm")) { /*save's CPU :-) */
+        if (def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE) {
+            /* set others to false but may not be necessary */
+            if (xenConfigSetInt(conf, "sdl", 0) < 0)
+                return -1;
+
+            if (xenConfigSetInt(conf, "vnc", 0) < 0)
+                return -1;
+
+            if (xenConfigSetInt(conf, "spice", 1) < 0)
+                return -1;
+
+            if (xenConfigSetInt(conf, "spiceport",
+                                def->graphics[0]->data.spice.port) < 0)
+                return -1;
+
+            if (xenConfigSetInt(conf, "spicetls_port",
+                                def->graphics[0]->data.spice.tlsPort) < 0)
+                return -1;
+
+            if (def->graphics[0]->data.spice.auth.passwd) {
+                if (xenConfigSetInt(conf, "spicedisable_ticketing", 1) < 0)
+                    return -1;
+
+                if (def->graphics[0]->data.spice.auth.passwd &&
+                    xenConfigSetString(conf, "spicepasswd",
+                                def->graphics[0]->data.spice.auth.passwd) < 0)
+                    return -1;
+            }
+
+            listenAddr = virDomainGraphicsListenGetAddress(def->graphics[0], 0);
+            if (listenAddr &&
+                xenConfigSetString(conf, "spicehost", listenAddr) < 0) {
+                return -1;
+            }
+
+            if (xenConfigSetInt(conf, "spice_mouse_agent",
+                                def->graphics[0]->data.spice.mousemode) < 0)
+                return -1;
+            if (def->graphics[0]->data.spice.copypaste) {
+                if (xenConfigSetInt(conf, "spicedvagent", 1) < 0)
+                    return -1;
+                if (xenConfigSetInt(conf, "spice_clipboard_sharing",
+                                def->graphics[0]->data.spice.copypaste) < 0)
+                return -1;
+            }
+        }
+    }
+
+    return 0;
+}
+
+
+virConfPtr
+xenFormatXL(virDomainDefPtr def, virConnectPtr conn,
+            int xendConfigVersion)
+{
+    virConfPtr conf = NULL;
+
+    if (!(conf = virConfNew()))
+        goto cleanup;
+
+    if (xenFormatConfigCommon(conf, def, conn, xendConfigVersion) < 0)
+        goto cleanup;
+
+    if (xenFormatXLDomainDisks(conf, def) < 0)
+        goto cleanup;
+
+    if (xenFormatXLSpice(conf, def) < 0)
+        goto cleanup;
+
+    return conf;
+
+ cleanup:
+    if (conf)
+        virConfFree(conf);
+    return NULL;
+}
diff --git a/src/xenconfig/xen_xl.h b/src/xenconfig/xen_xl.h
new file mode 100644
index 0000000..d60fe5e
--- /dev/null
+++ b/src/xenconfig/xen_xl.h
@@ -0,0 +1,29 @@
+/*
+ * xen_xl.h: Xen XL parsing functions
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Author: Kiarie Kahurani<davidkiarie4 gmail com>
+ */
+#ifndef _XEN_XL_H_
+# define _XEN_XL_H_
+
+# include "xen_common.h"
+
+virDomainDefPtr xenParseXL(virConfPtr conn, virCapsPtr caps,
+                           int xendConfigVersion);
+virConfPtr xenFormatXL(virDomainDefPtr def,
+                       virConnectPtr, int xendConfigVersion);
+#endif /* _XEN_XL_H_ */
-- 
1.8.4.5


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