New API: inspect_get_osinfo

Try to guess the possible osinfo-db short ID for the specified OS.

Related to: https://bugzilla.redhat.com/show_bug.cgi?id=1544842

generator/actions_inspection.ml

@@ -774,4 +774,18 @@ advice before using trademarks in applications.
 
 =back" };
 
+  { defaults with
+    name = "inspect_get_osinfo"; added = (1, 39, 1);
+    style = RString (RPlainString, "id"), [String (Mountable, "root")], [];
+    shortdesc = "get a possible osinfo short ID corresponding to this operating system";
+    longdesc = "\
+This function returns a possible short ID for libosinfo corresponding
+to the guest.
+
+I<Note:> The returned ID is only a guess by libguestfs, and nothing
+ensures that it actually exists in osinfo-db.
+
+If no ID could not be determined, then the string C<unknown> is
+returned." };
+
 ]

lib/Makefile.am

@@ -95,6 +95,7 @@ libguestfs_la_SOURCES = \
 	info.c \
 	inspect-apps.c \
 	inspect-icon.c \
+	inspect-osinfo.c \
 	journal.c \
 	launch.c \
 	launch-direct.c \

lib/inspect-osinfo.c

@@ -0,0 +1,75 @@
+/* libguestfs
+ * Copyright (C) 2018 Red Hat Inc.
+ *
+ * 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 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include "guestfs.h"
+#include "guestfs-internal.h"
+#include "guestfs-internal-actions.h"
+
+char *
+guestfs_impl_inspect_get_osinfo (guestfs_h *g, const char *root)
+{
+  CLEANUP_FREE char *type = NULL;
+  CLEANUP_FREE char *distro = NULL;
+  int major, minor;
+
+  type = guestfs_inspect_get_type (g, root);
+  if (!type)
+    return NULL;
+  distro = guestfs_inspect_get_distro (g, root);
+  if (!distro)
+    return NULL;
+  major = guestfs_inspect_get_major_version (g, root);
+  minor = guestfs_inspect_get_minor_version (g, root);
+
+  if (STREQ (type, "linux")) {
+    if (STREQ (distro, "centos")) {
+      if (major >= 7)
+        return safe_asprintf (g, "%s%d.0", distro, major);
+      else if (major == 6)
+        return safe_asprintf (g, "%s%d.%d", distro, major, minor);
+    }
+    else if (STREQ (distro, "debian")) {
+      if (major >= 4)
+        return safe_asprintf (g, "%s%d", distro, major);
+    }
+    else if (STREQ (distro, "fedora") || STREQ (distro, "mageia"))
+      return safe_asprintf (g, "%s%d", distro, major);
+    else if (STREQ (distro, "sles")) {
+      if (minor == 0)
+        return safe_asprintf (g, "%s%d", distro, major);
+      else
+        return safe_asprintf (g, "%s%dsp%d", distro, major, minor);
+    }
+    else if (STREQ (distro, "ubuntu"))
+      return safe_asprintf (g, "%s%d.%02d", distro, major, minor);
+
+    if (major > 0 || minor > 0)
+      return safe_asprintf (g, "%s%d.%d", distro, major, minor);
+  }
+  else if (STREQ (type, "freebsd") || STREQ (type, "netbsd") || STREQ (type, "openbsd"))
+    return safe_asprintf (g, "%s%d.%d", distro, major, minor);
+  else if (STREQ (type, "dos")) {
+    if (STREQ (distro, "msdos"))
+      return safe_strdup (g, "msdos6.22");
+  }
+
+  /* No ID could be guessed, return "unknown". */
+  return safe_strdup (g, "unknown");
+}