qemu/qerror.c

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/*
* QError Module
*
* Copyright (C) 2009 Red Hat Inc.
*
* Authors:
* Luiz Capitulino <lcapitulino@redhat.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*/
#include "monitor.h"
#include "qjson.h"
#include "qerror.h"
#include "qemu-common.h"
static void qerror_destroy_obj(QObject *obj);
static const QType qerror_type = {
.code = QTYPE_QERROR,
.destroy = qerror_destroy_obj,
};
/**
* The 'desc' parameter is a printf-like string, the format of the format
* string is:
*
* %(KEY)
*
* Where KEY is a QDict key, which has to be passed to qerror_from_info().
*
* Example:
*
* "foo error on device: %(device) slot: %(slot_nr)"
*
* A single percent sign can be printed if followed by a second one,
* for example:
*
* "running out of foo: %(foo)%%"
*
* Please keep the entries in alphabetical order.
* Use scripts/check-qerror.sh to check.
*/
static const QErrorStringTable qerror_table[] = {
{
QERR_ADD_CLIENT_FAILED,
"Could not add client",
},
{
QERR_AMBIGUOUS_PATH,
"Path '%(path)' does not uniquely identify an object"
},
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{
QERR_BAD_BUS_FOR_DEVICE,
"Device '%(device)' can't go on a %(bad_bus_type) bus",
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},
{
QERR_BASE_NOT_FOUND,
"Base '%(base)' not found",
},
{
QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
"Block format '%(format)' used by device '%(name)' does not support feature '%(feature)'",
},
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{
QERR_BUS_NO_HOTPLUG,
"Bus '%(bus)' does not support hotplugging",
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},
{
QERR_BUS_NOT_FOUND,
"Bus '%(bus)' not found",
},
{
QERR_COMMAND_DISABLED,
"The command %(name) has been disabled for this instance",
},
{
QERR_COMMAND_NOT_FOUND,
"The command %(name) has not been found",
},
{
QERR_DEVICE_ENCRYPTED,
"'%(device)' (%(filename)) is encrypted",
},
{
QERR_DEVICE_FEATURE_BLOCKS_MIGRATION,
"Migration is disabled when using feature '%(feature)' in device '%(device)'",
},
{
QERR_DEVICE_HAS_NO_MEDIUM,
"Device '%(device)' has no medium",
},
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{
QERR_DEVICE_INIT_FAILED,
"Device '%(device)' could not be initialized",
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},
{
QERR_DEVICE_IN_USE,
"Device '%(device)' is in use",
},
{
QERR_DEVICE_IS_READ_ONLY,
"Device '%(device)' is read only",
},
{
QERR_DEVICE_LOCKED,
"Device '%(device)' is locked",
},
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{
QERR_DEVICE_MULTIPLE_BUSSES,
"Device '%(device)' has multiple child busses",
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},
{
QERR_DEVICE_NO_BUS,
"Device '%(device)' has no child bus",
},
{
QERR_DEVICE_NO_HOTPLUG,
"Device '%(device)' does not support hotplugging",
},
{
QERR_DEVICE_NOT_ACTIVE,
"Device '%(device)' has not been activated",
},
{
QERR_DEVICE_NOT_ENCRYPTED,
"Device '%(device)' is not encrypted",
},
{
QERR_DEVICE_NOT_FOUND,
"Device '%(device)' not found",
},
{
QERR_DEVICE_NOT_REMOVABLE,
"Device '%(device)' is not removable",
},
{
QERR_DUPLICATE_ID,
"Duplicate ID '%(id)' for %(object)",
},
{
QERR_FD_NOT_FOUND,
"File descriptor named '%(name)' not found",
},
{
QERR_FD_NOT_SUPPLIED,
"No file descriptor supplied via SCM_RIGHTS",
},
{
QERR_FEATURE_DISABLED,
"The feature '%(name)' is not enabled",
},
{
QERR_INVALID_BLOCK_FORMAT,
"Invalid block format '%(name)'",
},
{
QERR_INVALID_OPTION_GROUP,
"There is no option group '%(group)'",
},
{
QERR_INVALID_PARAMETER,
"Invalid parameter '%(name)'",
},
{
QERR_INVALID_PARAMETER_COMBINATION,
"Invalid parameter combination",
},
{
QERR_INVALID_PARAMETER_TYPE,
"Invalid parameter type for '%(name)', expected: %(expected)",
},
{
QERR_INVALID_PARAMETER_VALUE,
"Parameter '%(name)' expects %(expected)",
},
{
QERR_INVALID_PASSWORD,
"Password incorrect",
},
{
QERR_IO_ERROR,
"An IO error has occurred",
},
{
QERR_JSON_PARSE_ERROR,
"JSON parse error, %(message)",
},
{
QERR_JSON_PARSING,
"Invalid JSON syntax",
},
{
QERR_KVM_MISSING_CAP,
"Using KVM without %(capability), %(feature) unavailable",
},
{
QERR_MIGRATION_ACTIVE,
"There's a migration process in progress",
},
{
QERR_MIGRATION_NOT_SUPPORTED,
"State blocked by non-migratable device '%(device)'",
},
{
QERR_MIGRATION_EXPECTED,
"An incoming migration is expected before this command can be executed",
},
{
QERR_MISSING_PARAMETER,
"Parameter '%(name)' is missing",
},
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{
QERR_NO_BUS_FOR_DEVICE,
"No '%(bus)' bus found for device '%(device)'",
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},
{
QERR_NOT_SUPPORTED,
"Not supported",
},
{
QERR_OPEN_FILE_FAILED,
"Could not open '%(filename)'",
},
{
QERR_PERMISSION_DENIED,
"Insufficient permission to perform this operation",
},
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{
QERR_PROPERTY_NOT_FOUND,
"Property '%(device).%(property)' not found",
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},
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{
QERR_PROPERTY_VALUE_BAD,
"Property '%(device).%(property)' doesn't take value '%(value)'",
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},
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{
QERR_PROPERTY_VALUE_IN_USE,
"Property '%(device).%(property)' can't take value '%(value)', it's in use",
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},
{
QERR_PROPERTY_VALUE_NOT_FOUND,
"Property '%(device).%(property)' can't find value '%(value)'",
},
{
QERR_PROPERTY_VALUE_NOT_POWER_OF_2,
"Property '%(device).%(property)' doesn't take "
"value '%(value)', it's not a power of 2",
},
{
QERR_PROPERTY_VALUE_OUT_OF_RANGE,
"Property '%(device).%(property)' doesn't take "
"value %(value) (minimum: %(min), maximum: %(max))",
},
{
QERR_QGA_COMMAND_FAILED,
"Guest agent command failed, error was '%(message)'",
},
{
QERR_QGA_LOGGING_FAILED,
"Guest agent failed to log non-optional log statement",
},
{
QERR_QMP_BAD_INPUT_OBJECT,
"Expected '%(expected)' in QMP input",
},
{
QERR_QMP_BAD_INPUT_OBJECT_MEMBER,
"QMP input object member '%(member)' expects '%(expected)'",
},
{
QERR_QMP_EXTRA_MEMBER,
"QMP input object member '%(member)' is unexpected",
},
{
QERR_RESET_REQUIRED,
"Resetting the Virtual Machine is required",
},
{
QERR_SET_PASSWD_FAILED,
"Could not set password",
},
{
QERR_TOO_MANY_FILES,
"Too many open files",
},
{
QERR_UNDEFINED_ERROR,
"An undefined error has occurred",
},
{
QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
"'%(device)' uses a %(format) feature which is not "
"supported by this qemu version: %(feature)",
},
{
QERR_UNSUPPORTED,
"this feature or command is not currently supported",
},
{
QERR_VIRTFS_FEATURE_BLOCKS_MIGRATION,
"Migration is disabled when VirtFS export path '%(path)' "
"is mounted in the guest using mount_tag '%(tag)'",
},
{
QERR_VNC_SERVER_FAILED,
"Could not start VNC server on %(target)",
},
{
QERR_SOCKET_CONNECT_FAILED,
"Failed to connect to socket",
},
{
QERR_SOCKET_LISTEN_FAILED,
"Failed to set socket to listening mode",
},
{
QERR_SOCKET_BIND_FAILED,
"Failed to bind socket",
},
{
QERR_SOCKET_CREATE_FAILED,
"Failed to create socket",
},
{}
};
/**
* qerror_new(): Create a new QError
*
* Return strong reference.
*/
static QError *qerror_new(void)
{
QError *qerr;
qerr = g_malloc0(sizeof(*qerr));
QOBJECT_INIT(qerr, &qerror_type);
return qerr;
}
static QDict *error_obj_from_fmt_no_fail(const char *fmt, va_list *va)
{
QObject *obj;
QDict *ret;
obj = qobject_from_jsonv(fmt, va);
if (!obj) {
fprintf(stderr, "invalid json in error dict '%s'\n", fmt);
abort();
}
if (qobject_type(obj) != QTYPE_QDICT) {
fprintf(stderr, "error is not a dict '%s'\n", fmt);
abort();
}
ret = qobject_to_qdict(obj);
obj = qdict_get(ret, "class");
if (!obj) {
fprintf(stderr, "missing 'class' key in '%s'\n", fmt);
abort();
}
if (qobject_type(obj) != QTYPE_QSTRING) {
fprintf(stderr, "'class' key value should be a string in '%s'\n", fmt);
abort();
}
obj = qdict_get(ret, "data");
if (!obj) {
fprintf(stderr, "missing 'data' key in '%s'\n", fmt);
abort();
}
if (qobject_type(obj) != QTYPE_QDICT) {
fprintf(stderr, "'data' key value should be a dict in '%s'\n", fmt);
abort();
}
return ret;
}
/**
* qerror_from_info(): Create a new QError from error information
*
* Return strong reference.
*/
static QError *qerror_from_info(const char *fmt, va_list *va)
{
QError *qerr;
qerr = qerror_new();
loc_save(&qerr->loc);
qerr->error = error_obj_from_fmt_no_fail(fmt, va);
qerr->err_msg = qerror_format(fmt, qerr->error);
return qerr;
}
static void parse_error(const QErrorStringTable *entry, int c)
{
fprintf(stderr, "expected '%c' in '%s'", c, entry->desc);
abort();
}
static const char *append_field(QDict *error, QString *outstr,
const QErrorStringTable *entry,
const char *start)
{
QObject *obj;
QDict *qdict;
QString *key_qs;
const char *end, *key;
if (*start != '%')
parse_error(entry, '%');
start++;
if (*start != '(')
parse_error(entry, '(');
start++;
end = strchr(start, ')');
if (!end)
parse_error(entry, ')');
key_qs = qstring_from_substr(start, 0, end - start - 1);
key = qstring_get_str(key_qs);
qdict = qobject_to_qdict(qdict_get(error, "data"));
obj = qdict_get(qdict, key);
if (!obj) {
abort();
}
switch (qobject_type(obj)) {
case QTYPE_QSTRING:
qstring_append(outstr, qdict_get_str(qdict, key));
break;
case QTYPE_QINT:
qstring_append_int(outstr, qdict_get_int(qdict, key));
break;
default:
abort();
}
QDECREF(key_qs);
return ++end;
}
static QString *qerror_format_desc(QDict *error,
const QErrorStringTable *entry)
{
QString *qstring;
const char *p;
assert(entry != NULL);
qstring = qstring_new();
for (p = entry->desc; *p != '\0';) {
if (*p != '%') {
qstring_append_chr(qstring, *p++);
} else if (*(p + 1) == '%') {
qstring_append_chr(qstring, '%');
p += 2;
} else {
p = append_field(error, qstring, entry, p);
}
}
return qstring;
}
char *qerror_format(const char *fmt, QDict *error)
{
const QErrorStringTable *entry = NULL;
QString *qstr;
char *ret;
int i;
for (i = 0; qerror_table[i].error_fmt; i++) {
if (strcmp(qerror_table[i].error_fmt, fmt) == 0) {
entry = &qerror_table[i];
break;
}
}
qstr = qerror_format_desc(error, entry);
ret = g_strdup(qstring_get_str(qstr));
QDECREF(qstr);
return ret;
}
/**
* qerror_human(): Format QError data into human-readable string.
*/
QString *qerror_human(const QError *qerror)
{
return qstring_from_str(qerror->err_msg);
}
/**
* qerror_print(): Print QError data
*
* This function will print the member 'desc' of the specified QError object,
* it uses error_report() for this, so that the output is routed to the right
* place (ie. stderr or Monitor's device).
*/
static void qerror_print(QError *qerror)
{
QString *qstring = qerror_human(qerror);
loc_push_restore(&qerror->loc);
error_report("%s", qstring_get_str(qstring));
loc_pop(&qerror->loc);
QDECREF(qstring);
}
void qerror_report(const char *fmt, ...)
{
va_list va;
QError *qerror;
va_start(va, fmt);
qerror = qerror_from_info(fmt, &va);
va_end(va);
if (monitor_cur_is_qmp()) {
monitor_set_error(cur_mon, qerror);
} else {
qerror_print(qerror);
QDECREF(qerror);
}
}
/* Evil... */
struct Error
{
QDict *obj;
char *msg;
};
void qerror_report_err(Error *err)
{
QError *qerr;
qerr = qerror_new();
loc_save(&qerr->loc);
QINCREF(err->obj);
qerr->error = err->obj;
qerr->err_msg = g_strdup(err->msg);
if (monitor_cur_is_qmp()) {
monitor_set_error(cur_mon, qerr);
} else {
qerror_print(qerr);
QDECREF(qerr);
}
}
void assert_no_error(Error *err)
{
if (err) {
qerror_report_err(err);
abort();
}
}
/**
* qobject_to_qerror(): Convert a QObject into a QError
*/
static QError *qobject_to_qerror(const QObject *obj)
{
if (qobject_type(obj) != QTYPE_QERROR) {
return NULL;
}
return container_of(obj, QError, base);
}
/**
* qerror_destroy_obj(): Free all memory allocated by a QError
*/
static void qerror_destroy_obj(QObject *obj)
{
QError *qerr;
assert(obj != NULL);
qerr = qobject_to_qerror(obj);
QDECREF(qerr->error);
g_free(qerr->err_msg);
g_free(qerr);
}