Libguestfs - Feb 2018 - [PATCH] 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 | 14 ++++++++
 lib/Makefile.am                 |  1 +
 lib/inspect-osinfo.c            | 75 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 90 insertions(+)
 create mode 100644 lib/inspect-osinfo.c

diff --git a/generator/actions_inspection.ml b/generator/actions_inspection.ml
index d8cf571c9..d913f53e3 100644
--- a/generator/actions_inspection.ml
+++ b/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." };
+
 ]
diff --git a/lib/Makefile.am b/lib/Makefile.am
index d075174d9..742b182cc 100644
--- a/lib/Makefile.am
+++ b/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 \
diff --git a/lib/inspect-osinfo.c b/lib/inspect-osinfo.c
new file mode 100644
index 000000000..816d317f1
--- /dev/null
+++ b/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");
+}
-- 
2.14.3

Output also the osinfo guess for each OS in the generated XML output;
adapt the RNG schema, and the test data to it.
---
 inspector/expected-coreos.img.xml | 1 +
 inspector/expected-debian.img.xml | 1 +
 inspector/expected-fedora.img.xml | 1 +
 inspector/expected-ubuntu.img.xml | 1 +
 inspector/inspector.c             | 7 +++++++
 inspector/virt-inspector.rng      | 1 +
 6 files changed, 12 insertions(+)

diff --git a/inspector/expected-coreos.img.xml
b/inspector/expected-coreos.img.xml
index e4a5d1134..0cdfba6e6 100644
--- a/inspector/expected-coreos.img.xml
+++ b/inspector/expected-coreos.img.xml
@@ -8,6 +8,7 @@
     <major_version>899</major_version>
     <minor_version>13</minor_version>
     <hostname>coreos.invalid</hostname>
+    <osinfo>coreos899.13</osinfo>
     <mountpoints>
       <mountpoint dev="/dev/sda5">/</mountpoint>
       <mountpoint dev="/dev/sda3">/usr</mountpoint>
diff --git a/inspector/expected-debian.img.xml
b/inspector/expected-debian.img.xml
index 37ecfa049..6583dc262 100644
--- a/inspector/expected-debian.img.xml
+++ b/inspector/expected-debian.img.xml
@@ -11,6 +11,7 @@
     <package_format>deb</package_format>
     <package_management>apt</package_management>
     <hostname>debian.invalid</hostname>
+    <osinfo>debian5</osinfo>
     <mountpoints>
       <mountpoint dev="/dev/debian/root">/</mountpoint>
       <mountpoint dev="/dev/debian/usr">/usr</mountpoint>
diff --git a/inspector/expected-fedora.img.xml
b/inspector/expected-fedora.img.xml
index 8d40e8cb7..df6060a73 100644
--- a/inspector/expected-fedora.img.xml
+++ b/inspector/expected-fedora.img.xml
@@ -11,6 +11,7 @@
     <package_format>rpm</package_format>
     <package_management>yum</package_management>
     <hostname>fedora.invalid</hostname>
+    <osinfo>fedora14</osinfo>
     <mountpoints>
       <mountpoint dev="/dev/VG/Root">/</mountpoint>
       <mountpoint dev="/dev/sda1">/boot</mountpoint>
diff --git a/inspector/expected-ubuntu.img.xml
b/inspector/expected-ubuntu.img.xml
index c19c14cd5..4ebcd76d6 100644
--- a/inspector/expected-ubuntu.img.xml
+++ b/inspector/expected-ubuntu.img.xml
@@ -11,6 +11,7 @@
     <package_format>deb</package_format>
     <package_management>apt</package_management>
     <hostname>ubuntu.invalid</hostname>
+    <osinfo>ubuntu10.10</osinfo>
     <mountpoints>
       <mountpoint dev="/dev/sda2">/</mountpoint>
       <mountpoint dev="/dev/sda1">/boot</mountpoint>
diff --git a/inspector/inspector.c b/inspector/inspector.c
index d608b1b63..5075a8f04 100644
--- a/inspector/inspector.c
+++ b/inspector/inspector.c
@@ -443,6 +443,13 @@ output_root (xmlTextWriterPtr xo, char *root)
 					 BAD_CAST str));
   free (str);
 
+  str = guestfs_inspect_get_osinfo (g, root);
+  if (!str) exit (EXIT_FAILURE);
+  if (STRNEQ (str, "unknown"))
+    XMLERROR (-1,
+              xmlTextWriterWriteElement (xo, BAD_CAST "osinfo",
BAD_CAST str));
+  free (str);
+
   output_mountpoints (xo, root);
 
   output_filesystems (xo, root);
diff --git a/inspector/virt-inspector.rng b/inspector/virt-inspector.rng
index 314785202..1e3a58af8 100644
--- a/inspector/virt-inspector.rng
+++ b/inspector/virt-inspector.rng
@@ -38,6 +38,7 @@
             <optional><ref
name="ospackageformat"/></optional>
             <optional><ref
name="ospackagemanagement"/></optional>
             <optional><element
name="hostname"><text/></element></optional>
+            <optional><element
name="osinfo"><text/></element></optional>
 
             <ref name="mountpoints"/>
             <ref name="filesystems"/>
-- 
2.14.3

Use the newly added API instead of the local implementation.
---
 builder/repository_main.ml | 23 +----------------------
 1 file changed, 1 insertion(+), 22 deletions(-)

diff --git a/builder/repository_main.ml b/builder/repository_main.ml
index bb440563b..c020a6413 100644
--- a/builder/repository_main.ml
+++ b/builder/repository_main.ml
@@ -170,23 +170,6 @@ let get_disk_image_info filepath      size =
object_get_number "virtual-size" infos
   }
 
-let compute_short_id distro major minor -  match distro with
-  | "centos" when major >= 7 ->
-    sprintf "%s%d.0" distro major
-  | "debian" when major >= 4 ->
-    sprintf "%s%d" distro major
-  | ("fedora"|"mageia") ->
-    sprintf "%s%d" distro major
-  | "sles" when major = 0 ->
-    sprintf "%s%d" distro major
-  | "sles" ->
-    sprintf "%s%dsp%d" distro major minor
-  | "ubuntu" ->
-    sprintf "%s%d.%02d" distro major minor
-  | _ (* Any other combination. *) ->
-    sprintf "%s%d.%d" distro major minor
-
 let cmp a b    Index.string_of_arch a = Index.string_of_arch b
 
@@ -260,14 +243,10 @@ let process_image acc_entries filename repo tmprepo index
interactive
     let root = Array.get roots 0 in
     let inspected_arch = g#inspect_get_arch root in
     let product = g#inspect_get_product_name root in
-    let distro = g#inspect_get_distro root in
-    let version_major = g#inspect_get_major_version root in
-    let version_minor = g#inspect_get_minor_version root in
+    let shortid = g#inspect_get_osinfo root in
     let lvs = g#lvs () in
     let filesystems = g#inspect_get_filesystems root in
 
-    let shortid = compute_short_id distro version_major version_minor in
-
     g#close ();
 
     let id -- 
2.14.3

ACK series.

Was expecting an OCaml implementation though :-)

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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