Libguestfs - Jan 2016 - [PATCH 2/2] builder: allow a specific template for --list

Simple code motion, no behaviour changes.
---
 builder/builder.ml | 46 ++++++++++++++++++++++++++--------------------
 1 file changed, 26 insertions(+), 20 deletions(-)

diff --git a/builder/builder.ml b/builder/builder.ml
index 9c26573..ec9919f 100644
--- a/builder/builder.ml
+++ b/builder/builder.ml
@@ -75,6 +75,30 @@ let remove_duplicates index          false
   ) index
 
+(* Look for the specified os-version, resolving it as alias first. *)
+let selected_cli_item cmdline index +  let arg +    (* Try to resolve the
alias. *)
+    try
+      let item +        List.find (
+          fun (name, { Index.aliases = aliases }) ->
+            match aliases with
+            | None -> false
+            | Some l -> List.mem cmdline.arg l
+        ) index in
+        fst item
+    with Not_found -> cmdline.arg in
+  let item +    try List.find (
+      fun (name, { Index.arch = a }) ->
+        name = arg && cmdline.arch = normalize_arch a
+    ) index
+    with Not_found ->
+      error (f_"cannot find os-version '%s' with architecture
'%s'.\nUse --list to list available guest types.")
+        arg cmdline.arch in
+  item
+
 let main ()    (* Command line argument parsing - see cmdline.ml. *)
   let cmdline = parse_cmdline () in
@@ -229,26 +253,8 @@ let main ()      | (`Install|`Notes) as mode -> mode in
 
   (* Which os-version (ie. index entry)? *)
-  let arg -    (* Try to resolve the alias. *)
-    try
-      let item -        List.find (
-          fun (name, { Index.aliases = aliases }) ->
-            match aliases with
-            | None -> false
-            | Some l -> List.mem cmdline.arg l
-        ) index in
-        fst item
-    with Not_found -> cmdline.arg in
-  let item -    try List.find (
-      fun (name, { Index.arch = a }) ->
-        name = arg && cmdline.arch = normalize_arch a
-    ) index
-    with Not_found ->
-      error (f_"cannot find os-version '%s' with architecture
'%s'.\nUse --list to list available guest types.")
-        arg cmdline.arch in
+  let item = selected_cli_item cmdline index in
+  let arg = fst item in
   let entry = snd item in
   let sigchecker = entry.Index.sigchecker in
 
-- 
2.5.0

Allow the user to specify a template in --list mode, which will be the
only result in the resulting output (instead of all the available
templates).

This makes it easier to find out the details of a specific template.
---
 builder/builder.ml       |  6 ++++++
 builder/cmdline.ml       |  3 ++-
 builder/virt-builder.pod | 13 +++++++------
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/builder/builder.ml b/builder/builder.ml
index ec9919f..1f9a472 100644
--- a/builder/builder.ml
+++ b/builder/builder.ml
@@ -213,6 +213,12 @@ let main ()    let mode      match mode with
     | `List ->                          (* --list *)
+      let sources, index +        match cmdline.arg with
+        | "" -> sources, index   (* no template -> all the
available ones *)
+        | arg ->                 (* just the specified template *)
+          let item = selected_cli_item cmdline index in
+          [], [item] in
       List_entries.list_entries ~list_format:cmdline.list_format ~sources
index;
       exit 0
 
diff --git a/builder/cmdline.ml b/builder/cmdline.ml
index a077289..f872bd4 100644
--- a/builder/cmdline.ml
+++ b/builder/cmdline.ml
@@ -239,9 +239,10 @@ read the man page virt-builder(1).
       if format <> None then
         error (f_"--list: use '--list-format', not
'--format'");
       (match args with
+      | [arg] -> arg
       | [] -> ""
       | _ ->
-        error (f_"--list option does not need any extra arguments")
+        error (f_"too many parameters, at most one 'os-version' is
allowed for --list")
       )
     | `Notes ->
       (match args with
diff --git a/builder/virt-builder.pod b/builder/virt-builder.pod
index 545b134..9a49138 100644
--- a/builder/virt-builder.pod
+++ b/builder/virt-builder.pod
@@ -16,7 +16,7 @@ virt-builder - Build virtual machine images quickly
     [--arch ARCHITECTURE] [--attach ISOFILE]
 __CUSTOMIZE_SYNOPSIS__
 
- virt-builder -l|--list [--long] [--list-format short|long|json]
+ virt-builder -l|--list [--long] [--list-format short|long|json] [os-version]
 
  virt-builder --notes os-version
 
@@ -311,15 +311,16 @@ alternate home directory:
 
  virt-builder --gpg "gpg --homedir /tmp" [...]
 
-=item B<-l>
+=item B<-l> [os-version]
 
-=item B<--list>
+=item B<--list> [os-version]
 
-=item B<--list --list-format> format
+=item B<--list --list-format> format [os-version]
 
-=item B<--list --long>
+=item B<--list --long> [os-version]
 
-List available templates.
+List all the available templates if no guest is specified, or only for the
+specified one.
 
 It is possible to choose with I<--list-format> the output format for the
list
 templates:
-- 
2.5.0

ACK series.

  - - -

BTW, as RHEL 7.3 has now rebased on to 1.32, any features which are
required to be backported to RHEL 7.3 must have a separate BZ filed.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-builder quickly builds VMs from scratch
http://libguestfs.org/virt-builder.1.html