[virt-tools-list] [libosinfo 2/4] Add osinfo_db_guess_os_from_location()
Zeeshan Ali (Khattak)
zeeshanak at gnome.org
Mon Aug 22 21:31:24 UTC 2011
From: "Zeeshan Ali (Khattak)" <zeeshanak at gnome.org>
Add API to guess OS given an installation media location.
---
docs/reference/Libosinfo-sections.txt | 1 +
osinfo/libosinfo.syms | 2 +
osinfo/osinfo_db.c | 191 ++++++++++++++++++++++++++++++++-
osinfo/osinfo_db.h | 30 +++++
4 files changed, 223 insertions(+), 1 deletions(-)
diff --git a/docs/reference/Libosinfo-sections.txt b/docs/reference/Libosinfo-sections.txt
index 0aee98f..80816e6 100644
--- a/docs/reference/Libosinfo-sections.txt
+++ b/docs/reference/Libosinfo-sections.txt
@@ -18,6 +18,7 @@ osinfo_db_add_os
osinfo_db_add_platform
osinfo_db_add_device
osinfo_db_add_deployment
+osinfo_db_guess_os_from_location
osinfo_db_unique_values_for_property_in_os
osinfo_db_unique_values_for_property_in_platform
osinfo_db_unique_values_for_property_in_device
diff --git a/osinfo/libosinfo.syms b/osinfo/libosinfo.syms
index aadcbc3..2b2a03e 100644
--- a/osinfo/libosinfo.syms
+++ b/osinfo/libosinfo.syms
@@ -1,6 +1,7 @@
LIBOSINFO_0.0.1 {
global:
osinfo_db_get_type;
+ osinfo_install_media_error_quark;
osinfo_db_new;
osinfo_db_get_platform;
osinfo_db_get_device;
@@ -15,6 +16,7 @@ LIBOSINFO_0.0.1 {
osinfo_db_add_platform;
osinfo_db_add_device;
osinfo_db_add_deployment;
+ osinfo_db_guess_os_from_location;
osinfo_db_unique_values_for_property_in_os;
osinfo_db_unique_values_for_property_in_platform;
osinfo_db_unique_values_for_property_in_device;
diff --git a/osinfo/osinfo_db.c b/osinfo/osinfo_db.c
index 4c37365..d8e6b7c 100644
--- a/osinfo/osinfo_db.c
+++ b/osinfo/osinfo_db.c
@@ -23,11 +23,54 @@
*/
#include <osinfo/osinfo.h>
+#include <gio/gio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define MAX_VOLUME 32
+#define MAX_SYSTEM 32
+#define MAX_PUBLISHER 128
+
+#define PVD_OFFSET 0x00008000
+#define BOOTABLE_TAG "EL TORITO SPECIFICATION"
+
+typedef struct _PrimaryVolumeDescriptor PrimaryVolumeDescriptor;
+
+struct _PrimaryVolumeDescriptor {
+ guint8 ignored[8];
+ gchar system[MAX_SYSTEM]; /* System ID */
+ gchar volume[MAX_VOLUME]; /* Volume ID */
+ guint8 ignored2[246];
+ gchar publisher[MAX_PUBLISHER]; /* Publisher ID */
+ guint8 ignored3[1602];
+};
+
+typedef struct _SupplementaryVolumeDescriptor SupplementaryVolumeDescriptor;
+
+struct _SupplementaryVolumeDescriptor {
+ guint8 ignored[7];
+ gchar system[MAX_SYSTEM]; /* System ID */
+};
+
+GQuark
+osinfo_install_media_error_quark (void)
+{
+ static GQuark quark = 0;
+
+ if (!quark)
+ quark = g_quark_from_static_string ("osinfo-install-media-error");
+
+ return quark;
+}
G_DEFINE_TYPE (OsinfoDb, osinfo_db, G_TYPE_OBJECT);
#define OSINFO_DB_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), OSINFO_TYPE_DB, OsinfoDbPrivate))
+#define str_contains(str, substr) ((str) && \
+ (substr) && \
+ strstr((str), (substr)) != NULL)
+
/**
* SECTION:osinfo_db
* @short_description: Database of all entities
@@ -144,7 +187,6 @@ OsinfoOs *osinfo_db_get_os(OsinfoDb *db, const gchar *id)
return OSINFO_OS(osinfo_list_find_by_id(OSINFO_LIST(db->priv->oses), id));
}
-
/**
* osinfo_db_get_deployment:
* @db: the database
@@ -316,6 +358,153 @@ void osinfo_db_add_deployment(OsinfoDb *db, OsinfoDeployment *deployment)
osinfo_list_add(OSINFO_LIST(db->priv->deployments), OSINFO_ENTITY(deployment));
}
+/**
+ * osinfo_db_guess_os_from_location:
+ * @db: the database
+ * @location: the location of an installation media
+ * @cancellable (allow-none): a #GCancellable, or %NULL
+ * @error: The location where to store any error, or %NULL
+ *
+ * The @location could be any URI that GIO can handle or a local path.
+ *
+ * NOTE: Currently this only works for ISO images/devices.
+ *
+ * Returns: (transfer none): the operating system, or NULL if guessing failed
+ */
+OsinfoOs *osinfo_db_guess_os_from_location(OsinfoDb *db,
+ const gchar *location,
+ GCancellable *cancellable,
+ GError **error)
+{
+ OsinfoOs *ret = NULL;
+ PrimaryVolumeDescriptor pvd;
+ SupplementaryVolumeDescriptor svd;
+ GFile *file;
+ GFileInputStream *stream;
+ GList *oss = NULL;
+ GList *os_iter;
+
+ g_return_val_if_fail(OSINFO_IS_DB(db), NULL);
+ g_return_val_if_fail(location != NULL, NULL);
+ g_return_val_if_fail(error == NULL || *error == NULL, NULL);
+
+ file = g_file_new_for_commandline_arg(location);
+ stream = g_file_read(file, NULL, error);
+ if (error != NULL && *error != NULL) {
+ g_prefix_error(error, "Failed to open file");
+
+ goto EXIT;
+ }
+
+ memset(&pvd, 0, sizeof(pvd));
+ if (g_input_stream_skip(G_INPUT_STREAM(stream),
+ PVD_OFFSET,
+ cancellable,
+ error) < sizeof(pvd)) {
+ if (*error)
+ g_prefix_error(error, "Failed to skip %d bytes", PVD_OFFSET);
+ else
+ g_set_error(error,
+ OSINFO_INSTALL_MEDIA_ERROR,
+ OSINFO_INSTALL_MEDIA_ERROR_NO_DESCRIPTORS,
+ "No volume descriptors");
+
+ goto EXIT;
+ }
+
+ if (g_input_stream_read(G_INPUT_STREAM(stream),
+ &pvd,
+ sizeof(pvd),
+ cancellable,
+ error) < sizeof(pvd)) {
+ if (*error)
+ g_prefix_error(error, "Failed to read primary volume descriptor");
+ else
+ g_set_error(error,
+ OSINFO_INSTALL_MEDIA_ERROR,
+ OSINFO_INSTALL_MEDIA_ERROR_NO_PVD,
+ "Primary volume descriptor unavailable");
+
+ goto EXIT;
+ }
+
+ pvd.volume[MAX_VOLUME - 1] = 0;
+ pvd.system[MAX_SYSTEM - 1] = 0;
+ pvd.publisher[MAX_PUBLISHER - 1] = 0;
+
+ if (pvd.volume[0] && (pvd.system[0] == 0 && pvd.publisher[0] == 0)) {
+ g_set_error(error,
+ OSINFO_INSTALL_MEDIA_ERROR,
+ OSINFO_INSTALL_MEDIA_ERROR_INSUFFIENT_METADATA,
+ "Insufficient metadata on installation media");
+
+ goto EXIT;
+ }
+
+ memset(&svd, 0, sizeof(svd));
+ if (g_input_stream_read(G_INPUT_STREAM(stream),
+ &svd,
+ sizeof(svd),
+ cancellable,
+ error) < sizeof(svd)) {
+ if (*error)
+ g_prefix_error(error,
+ "Failed to read supplementary volume descriptor");
+ else
+ g_set_error(error,
+ OSINFO_INSTALL_MEDIA_ERROR,
+ OSINFO_INSTALL_MEDIA_ERROR_NO_SVD,
+ "Supplementary volume descriptor unavailable");
+
+ goto EXIT;
+ }
+
+ svd.system[MAX_SYSTEM - 1] = 0;
+
+ if (strncmp(BOOTABLE_TAG, svd.system, sizeof(BOOTABLE_TAG) != 0)) {
+ g_set_error(error,
+ OSINFO_INSTALL_MEDIA_ERROR,
+ OSINFO_INSTALL_MEDIA_ERROR_NOT_BOOTABLE,
+ "Install media is not bootable");
+
+ goto EXIT;
+ }
+
+ oss = osinfo_list_get_elements(OSINFO_LIST(db->priv->oses));
+ for (os_iter = oss; os_iter; os_iter = os_iter->next) {
+ OsinfoOs *os = OSINFO_OS(os_iter->data);
+ OsinfoMediaList *media_list = osinfo_os_get_media_list(os);
+ GList *medias = osinfo_list_get_elements(OSINFO_LIST(media_list));
+ GList *media_iter;
+
+ for (media_iter = medias; media_iter; media_iter = media_iter->next) {
+ OsinfoMedia *media = OSINFO_MEDIA(media_iter->data);
+ const gchar *media_volume = osinfo_media_get_volume_id(media);
+ const gchar *media_system = osinfo_media_get_system_id(media);
+ const gchar *media_publisher = osinfo_media_get_publisher_id(media);
+
+ if (str_contains(pvd.volume, media_volume) &&
+ (str_contains(pvd.system, media_system) ||
+ str_contains(pvd.publisher, media_publisher))) {
+ ret = os;
+ break;
+ }
+ }
+
+ g_list_free(medias);
+ g_object_unref(media_list);
+
+ if (ret)
+ break;
+ }
+
+EXIT:
+ g_list_free(oss);
+ g_object_unref(stream);
+ g_object_unref(file);
+
+ return ret;
+}
struct osinfo_db_populate_values_args {
GHashTable *values;
diff --git a/osinfo/osinfo_db.h b/osinfo/osinfo_db.h
index c9d506e..3f56de1 100644
--- a/osinfo/osinfo_db.h
+++ b/osinfo/osinfo_db.h
@@ -23,6 +23,7 @@
*/
#include <glib-object.h>
+#include <gio/gio.h>
#include <osinfo/osinfo_platform.h>
#include <osinfo/osinfo_os.h>
#include <osinfo/osinfo_device.h>
@@ -33,6 +34,30 @@
#ifndef __OSINFO_DB_H__
#define __OSINFO_DB_H__
+GQuark
+osinfo_install_media_error_quark (void) G_GNUC_CONST;
+
+#define OSINFO_INSTALL_MEDIA_ERROR (osinfo_install_media_error_quark ())
+
+/**
+ * OsinfoInstallMediaError:
+ * @OSINFO_INSTALL_MEDIA_ERROR_NO_DESCRIPTORS: No descriptors.
+ * @OSINFO_INSTALL_MEDIA_ERROR_INSUFFIENT_METADATA: Not enough metadata.
+ * @OSINFO_INSTALL_MEDIA_ERROR_NOT_BOOTABLE: Install media not bootable.
+ * @OSINFO_INSTALL_MEDIA_ERROR_NO_PVD: No Primary volume descriptor.
+ * @OSINFO_INSTALL_MEDIA_ERROR_NO_SVD: No supplementary volume descriptor.
+ *
+ * #GError codes used for errors in the #OSINFO_INSTALL_MEDIA_ERROR domain, during
+ * reading of data from install media for detection of OS.
+ */
+typedef enum {
+ OSINFO_INSTALL_MEDIA_ERROR_NO_DESCRIPTORS,
+ OSINFO_INSTALL_MEDIA_ERROR_NO_PVD,
+ OSINFO_INSTALL_MEDIA_ERROR_NO_SVD,
+ OSINFO_INSTALL_MEDIA_ERROR_INSUFFIENT_METADATA,
+ OSINFO_INSTALL_MEDIA_ERROR_NOT_BOOTABLE
+} OsinfoInstallMediaError;
+
/*
* Type macros.
*/
@@ -92,6 +117,11 @@ void osinfo_db_add_platform(OsinfoDb *db, OsinfoPlatform *platform);
void osinfo_db_add_device(OsinfoDb *db, OsinfoDevice *device);
void osinfo_db_add_deployment(OsinfoDb *db, OsinfoDeployment *deployment);
+OsinfoOs *osinfo_db_guess_os_from_location(OsinfoDb *db,
+ const gchar *location,
+ GCancellable *cancellable,
+ GError **error);
+
// Get me all unique values for property "vendor" among operating systems
GList *osinfo_db_unique_values_for_property_in_os(OsinfoDb *db, const gchar *propName);
--
1.7.6
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