Libguestfs - Dec 2015 - [PATCH 0/2] resize: Split out the command line parsing into Cmdline

Some simple refactoring of virt-resize.

I originally had the idea that we could turn virt-resize into a
library (cf. virt-customize) and use it from virt-builder, but I now
don't think that would make any meaningful difference.  In particular
we'd still have to open the handle the same number of times.

These two patches are left over from my work on that.

Rich.

Make the interface between command line parsing and the main program
explicit.

See also similar changes made in
commit c09be9334bf89b94aaa9664b5c76a6916fe2c395.
---
 po/POTFILES-ml     |   1 +
 resize/Makefile.am |   4 +-
 resize/cmdline.ml  | 248 ++++++++++++++++++++++++++++++++++++++++++++++
 resize/cmdline.mli |  53 ++++++++++
 resize/resize.ml   | 283 +++++++++++------------------------------------------
 5 files changed, 360 insertions(+), 229 deletions(-)
 create mode 100644 resize/cmdline.ml
 create mode 100644 resize/cmdline.mli

diff --git a/po/POTFILES-ml b/po/POTFILES-ml
index 00a9d63..a8a827d 100644
--- a/po/POTFILES-ml
+++ b/po/POTFILES-ml
@@ -49,6 +49,7 @@ mllib/planner.ml
 mllib/progress.ml
 mllib/regedit.ml
 mllib/uRI.ml
+resize/cmdline.ml
 resize/resize.ml
 sparsify/cmdline.ml
 sparsify/copying.ml
diff --git a/resize/Makefile.am b/resize/Makefile.am
index 43cab37..15a1049 100644
--- a/resize/Makefile.am
+++ b/resize/Makefile.am
@@ -24,9 +24,11 @@ EXTRA_DIST = \
 
 CLEANFILES = *~ *.annot *.cmi *.cmo *.cmx *.cmxa *.o virt-resize
 
-SOURCES_MLI +SOURCES_MLI = \
+	cmdline.mli
 
 SOURCES_ML = \
+	cmdline.ml \
 	resize.ml
 
 SOURCES_C = \
diff --git a/resize/cmdline.ml b/resize/cmdline.ml
new file mode 100644
index 0000000..5ced69f
--- /dev/null
+++ b/resize/cmdline.ml
@@ -0,0 +1,248 @@
+(* virt-resize
+ * Copyright (C) 2010-2015 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *)
+
+(* Command line argument parsing. *)
+
+open Common_utils
+open Common_gettext.Gettext
+
+open Printf
+
+type align_first_t = [ `Never | `Always | `Auto ]
+
+type unknown_filesystems_mode +  | UnknownFsIgnore
+  | UnknownFsWarn
+  | UnknownFsError
+
+type cmdline = {
+  infile : string;
+  infile_uri : URI.uri;
+  outfile : string;
+  align_first : align_first_t;
+  alignment : int64;
+  copy_boot_loader : bool;
+  deletes : string list;
+  dryrun : bool;
+  expand : string option;
+  expand_content : bool;
+  extra_partition : bool;
+  format : string option;
+  ignores : string list;
+  lv_expands : string list;
+  machine_readable : bool;
+  ntfsresize_force : bool;
+  output_format : string option;
+  resizes : string list;
+  resizes_force : string list;
+  shrink : string option;
+  sparse : bool;
+  unknown_fs_mode : unknown_filesystems_mode;
+}
+
+let parse_cmdline () +  let add xs s = xs := s :: !xs in
+
+  let align_first = ref "auto" in
+  let alignment = ref 128 in
+  let copy_boot_loader = ref true in
+  let deletes = ref [] in
+  let dryrun = ref false in
+  let expand = ref "" in
+  let set_expand s +    if s = "" then error (f_"empty --expand
option")
+    else if !expand <> "" then error (f_"--expand option
given twice")
+    else expand := s
+  in
+  let expand_content = ref true in
+  let extra_partition = ref true in
+  let format = ref "" in
+  let ignores = ref [] in
+  let lv_expands = ref [] in
+  let machine_readable = ref false in
+  let ntfsresize_force = ref false in
+  let output_format = ref "" in
+  let resizes = ref [] in
+  let resizes_force = ref [] in
+  let shrink = ref "" in
+  let set_shrink s +    if s = "" then error (f_"empty --shrink
option")
+    else if !shrink <> "" then error (f_"--shrink option
given twice")
+    else shrink := s
+  in
+  let sparse = ref true in
+  let unknown_fs_mode = ref "warn" in
+
+  let ditto = " -\"-" in
+  let argspec = [
+      "--align-first", Arg.Set_string align_first,
s_"never|always|auto" ^ " " ^ s_"Align first partition
(default: auto)";
+      "--alignment", Arg.Set_int alignment,   s_"sectors" ^
" " ^ s_"Set partition alignment (default: 128 sectors)";
+      "--no-copy-boot-loader", Arg.Clear copy_boot_loader, "
" ^ s_"Don't copy boot loader";
+      "-d",        Arg.Unit set_verbose,      " " ^
s_"Enable debugging messages";
+      "--debug",   Arg.Unit set_verbose,      ditto;
+      "--delete",  Arg.String (add deletes),  s_"part" ^
" " ^ s_"Delete partition";
+      "--expand",  Arg.String set_expand,     s_"part" ^
" " ^ s_"Expand partition";
+      "--no-expand-content", Arg.Clear expand_content, " "
^ s_"Don't expand content";
+      "--no-extra-partition", Arg.Clear extra_partition, "
" ^ s_"Don't create extra partition";
+      "--format",  Arg.Set_string format,     s_"format" ^
" " ^ s_"Format of input disk";
+      "--ignore",  Arg.String (add ignores),  s_"part" ^
" " ^ s_"Ignore partition";
+      "--lv-expand", Arg.String (add lv_expands), s_"lv" ^
" " ^ s_"Expand logical volume";
+      "--LV-expand", Arg.String (add lv_expands), s_"lv" ^
ditto;
+      "--lvexpand", Arg.String (add lv_expands), s_"lv" ^
ditto;
+      "--LVexpand", Arg.String (add lv_expands), s_"lv" ^
ditto;
+      "--machine-readable", Arg.Set machine_readable, " " ^
s_"Make output machine readable";
+      "-n",        Arg.Set dryrun,            " " ^
s_"Don't perform changes";
+      "--dry-run", Arg.Set dryrun,            " " ^
s_"Don't perform changes";
+      "--dryrun",  Arg.Set dryrun,            ditto;
+      "--ntfsresize-force", Arg.Set ntfsresize_force, " " ^
s_"Force ntfsresize";
+      "--output-format", Arg.Set_string output_format,
s_"format" ^ " " ^ s_"Format of output disk";
+      "--resize",  Arg.String (add resizes),  s_"part=size"
^ " " ^ s_"Resize partition";
+      "--resize-force", Arg.String (add resizes_force),
s_"part=size" ^ " " ^ s_"Forcefully resize
partition";
+      "--shrink",  Arg.String set_shrink,     s_"part" ^
" " ^ s_"Shrink partition";
+      "--no-sparse", Arg.Clear sparse,        " " ^
s_"Turn off sparse copying";
+      "--unknown-filesystems", Arg.Set_string unknown_fs_mode,
+                                              s_"ignore|warn|error" ^
" " ^ s_"Behaviour on expand unknown filesystems (default:
warn)";
+    ] in
+  let argspec = set_standard_options argspec in
+  let disks = ref [] in
+  let anon_fun s = disks := s :: !disks in
+  let usage_msg +    sprintf (f_"\
+%s: resize a virtual machine disk
+
+A short summary of the options is given below.  For detailed help please
+read the man page virt-resize(1).
+")
+            prog in
+  Arg.parse argspec anon_fun usage_msg;
+
+  if verbose () then (
+    printf "command line:";
+    List.iter (printf " %s") (Array.to_list Sys.argv);
+    print_newline ()
+  );
+
+  (* Dereference the rest of the args. *)
+  let alignment = !alignment in
+  let copy_boot_loader = !copy_boot_loader in
+  let deletes = List.rev !deletes in
+  let dryrun = !dryrun in
+  let expand = match !expand with "" -> None | str -> Some str
in
+  let expand_content = !expand_content in
+  let extra_partition = !extra_partition in
+  let format = match !format with "" -> None | str -> Some str
in
+  let ignores = List.rev !ignores in
+  let lv_expands = List.rev !lv_expands in
+  let machine_readable = !machine_readable in
+  let ntfsresize_force = !ntfsresize_force in
+  let output_format = match !output_format with "" -> None | str
-> Some str in
+  let resizes = List.rev !resizes in
+  let resizes_force = List.rev !resizes_force in
+  let shrink = match !shrink with "" -> None | str -> Some str
in
+  let sparse = !sparse in
+  let unknown_fs_mode = !unknown_fs_mode in
+
+  if alignment < 1 then
+    error (f_"alignment cannot be < 1");
+  let alignment = Int64.of_int alignment in
+
+  let align_first +    match !align_first with
+    | "never" -> `Never
+    | "always" -> `Always
+    | "auto" -> `Auto
+    | _ ->
+       error (f_"unknown --align-first option: use
never|always|auto") in
+
+  let unknown_fs_mode +    match unknown_fs_mode with
+    | "ignore" -> UnknownFsIgnore
+    | "warn" -> UnknownFsWarn
+    | "error" -> UnknownFsError
+    | _ ->
+       error (f_"unknown --unknown-filesystems: use
ignore|warn|error") in
+
+  (* No arguments and machine-readable mode?  Print out some facts
+   * about what this binary supports.  We only need to print out new
+   * things added since this option, or things which depend on features
+   * of the appliance.
+   *)
+  if !disks = [] && machine_readable then (
+    printf "virt-resize\n";
+    printf "ntfsresize-force\n";
+    printf "32bitok\n";
+    printf "128-sector-alignment\n";
+    printf "alignment\n";
+    printf "align-first\n";
+    printf "infile-uri\n";
+    let g = open_guestfs () in
+    g#add_drive "/dev/null";
+    g#launch ();
+    if g#feature_available [| "ntfsprogs"; "ntfs3g" |] then
+      printf "ntfs\n";
+    if g#feature_available [| "btrfs" |] then
+      printf "btrfs\n";
+    if g#feature_available [| "xfs" |] then
+      printf "xfs\n";
+    exit 0
+  );
+
+  (* Verify we got exactly 2 disks. *)
+  let infile, outfile +    match List.rev !disks with
+    | [infile; outfile] -> infile, outfile
+    | _ ->
+       error (f_"usage is: %s [--options] indisk outdisk") prog in
+
+  (* Simple-minded check that the user isn't trying to use the
+   * same disk for input and output.
+   *)
+  if infile = outfile then
+    error (f_"you cannot use the same disk image for input and
output");
+
+  (* infile can be a URI. *)
+  let infile, infile_uri +    try infile, URI.parse_uri infile
+    with Invalid_argument "URI.parse_uri" ->
+      error (f_"error parsing URI '%s'. Look for error messages
printed above.")
+            infile in
+
+  {
+    infile = infile;
+    infile_uri = infile_uri;
+    outfile = outfile;
+    align_first = align_first;
+    alignment = alignment;
+    copy_boot_loader = copy_boot_loader;
+    deletes = deletes;
+    dryrun = dryrun;
+    expand = expand;
+    expand_content = expand_content;
+    extra_partition = extra_partition;
+    format = format;
+    ignores = ignores;
+    lv_expands = lv_expands;
+    machine_readable = machine_readable;
+    ntfsresize_force = ntfsresize_force;
+    output_format = output_format;
+    resizes = resizes;
+    resizes_force = resizes_force;
+    shrink = shrink;
+    sparse = sparse;
+    unknown_fs_mode = unknown_fs_mode;
+  }
diff --git a/resize/cmdline.mli b/resize/cmdline.mli
new file mode 100644
index 0000000..198e57b
--- /dev/null
+++ b/resize/cmdline.mli
@@ -0,0 +1,53 @@
+(* virt-resize
+ * Copyright (C) 2010-2015 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *)
+
+(** Command line argument parsing. *)
+
+type align_first_t = [ `Never | `Always | `Auto ]
+
+type unknown_filesystems_mode +  | UnknownFsIgnore
+  | UnknownFsWarn
+  | UnknownFsError
+
+type cmdline = {
+  infile : string;
+  infile_uri : URI.uri;
+  outfile : string;
+  align_first : align_first_t;
+  alignment : int64;
+  copy_boot_loader : bool;
+  deletes : string list;
+  dryrun : bool;
+  expand : string option;
+  expand_content : bool;
+  extra_partition : bool;
+  format : string option;
+  ignores : string list;
+  lv_expands : string list;
+  machine_readable : bool;
+  ntfsresize_force : bool;
+  output_format : string option;
+  resizes : string list;
+  resizes_force : string list;
+  shrink : string option;
+  sparse : bool;
+  unknown_fs_mode : unknown_filesystems_mode;
+}
+
+val parse_cmdline : unit -> cmdline
diff --git a/resize/resize.ml b/resize/resize.ml
index 5ca2f20..4add4ee 100644
--- a/resize/resize.ml
+++ b/resize/resize.ml
@@ -21,14 +21,13 @@ open Printf
 open Common_utils
 open Common_gettext.Gettext
 
+open Cmdline
+
 module G = Guestfs
 
 (* Minimum surplus before we create an extra partition. *)
 let min_extra_partition = 10L *^ 1024L *^ 1024L
 
-(* Command line argument parsing. *)
-type align_first_t = [ `Never | `Always | `Auto ]
-
 (* Source partition type. *)
 type parttype = MBR | GPT
 
@@ -137,190 +136,9 @@ let string_of_expand_content_method = function
   | BtrfsFilesystemResize -> s_"btrfs-filesystem-resize"
   | XFSGrowFS -> s_"xfs_growfs"
 
-type unknown_filesystems_mode -  | UnknownFsIgnore
-  | UnknownFsWarn
-  | UnknownFsError
-
 (* Main program. *)
 let main () -  let infile, outfile, align_first, alignment, copy_boot_loader,
-    deletes,
-    dryrun, expand, expand_content, extra_partition, format, ignores,
-    lv_expands, machine_readable, ntfsresize_force, output_format,
-    resizes, resizes_force, shrink, sparse, unknown_fs_mode -
-    let add xs s = xs := s :: !xs in
-
-    let align_first = ref "auto" in
-    let alignment = ref 128 in
-    let copy_boot_loader = ref true in
-    let deletes = ref [] in
-    let dryrun = ref false in
-    let expand = ref "" in
-    let set_expand s -      if s = "" then error (f_"empty
--expand option")
-      else if !expand <> "" then error (f_"--expand option
given twice")
-      else expand := s
-    in
-    let expand_content = ref true in
-    let extra_partition = ref true in
-    let format = ref "" in
-    let ignores = ref [] in
-    let lv_expands = ref [] in
-    let machine_readable = ref false in
-    let ntfsresize_force = ref false in
-    let output_format = ref "" in
-    let resizes = ref [] in
-    let resizes_force = ref [] in
-    let shrink = ref "" in
-    let set_shrink s -      if s = "" then error (f_"empty
--shrink option")
-      else if !shrink <> "" then error (f_"--shrink option
given twice")
-      else shrink := s
-    in
-    let sparse = ref true in
-    let unknown_fs_mode = ref "warn" in
-
-    let ditto = " -\"-" in
-    let argspec = [
-      "--align-first", Arg.Set_string align_first,
s_"never|always|auto" ^ " " ^ s_"Align first partition
(default: auto)";
-      "--alignment", Arg.Set_int alignment,   s_"sectors" ^
" " ^ s_"Set partition alignment (default: 128 sectors)";
-      "--no-copy-boot-loader", Arg.Clear copy_boot_loader, "
" ^ s_"Don't copy boot loader";
-      "-d",        Arg.Unit set_verbose,      " " ^
s_"Enable debugging messages";
-      "--debug",   Arg.Unit set_verbose,      ditto;
-      "--delete",  Arg.String (add deletes),  s_"part" ^
" " ^ s_"Delete partition";
-      "--expand",  Arg.String set_expand,     s_"part" ^
" " ^ s_"Expand partition";
-      "--no-expand-content", Arg.Clear expand_content, " "
^ s_"Don't expand content";
-      "--no-extra-partition", Arg.Clear extra_partition, "
" ^ s_"Don't create extra partition";
-      "--format",  Arg.Set_string format,     s_"format" ^
" " ^ s_"Format of input disk";
-      "--ignore",  Arg.String (add ignores),  s_"part" ^
" " ^ s_"Ignore partition";
-      "--lv-expand", Arg.String (add lv_expands), s_"lv" ^
" " ^ s_"Expand logical volume";
-      "--LV-expand", Arg.String (add lv_expands), s_"lv" ^
ditto;
-      "--lvexpand", Arg.String (add lv_expands), s_"lv" ^
ditto;
-      "--LVexpand", Arg.String (add lv_expands), s_"lv" ^
ditto;
-      "--machine-readable", Arg.Set machine_readable, " " ^
s_"Make output machine readable";
-      "-n",        Arg.Set dryrun,            " " ^
s_"Don't perform changes";
-      "--dry-run", Arg.Set dryrun,            " " ^
s_"Don't perform changes";
-      "--dryrun",  Arg.Set dryrun,            ditto;
-      "--ntfsresize-force", Arg.Set ntfsresize_force, " " ^
s_"Force ntfsresize";
-      "--output-format", Arg.Set_string output_format,
s_"format" ^ " " ^ s_"Format of output disk";
-      "--resize",  Arg.String (add resizes),  s_"part=size"
^ " " ^ s_"Resize partition";
-      "--resize-force", Arg.String (add resizes_force),
s_"part=size" ^ " " ^ s_"Forcefully resize
partition";
-      "--shrink",  Arg.String set_shrink,     s_"part" ^
" " ^ s_"Shrink partition";
-      "--no-sparse", Arg.Clear sparse,        " " ^
s_"Turn off sparse copying";
-      "--unknown-filesystems", Arg.Set_string unknown_fs_mode,
-                                              s_"ignore|warn|error" ^
" " ^ s_"Behaviour on expand unknown filesystems (default:
warn)";
-    ] in
-    let argspec = set_standard_options argspec in
-    let disks = ref [] in
-    let anon_fun s = disks := s :: !disks in
-    let usage_msg -      sprintf (f_"\
-%s: resize a virtual machine disk
-
-A short summary of the options is given below.  For detailed help please
-read the man page virt-resize(1).
-")
-        prog in
-    Arg.parse argspec anon_fun usage_msg;
-
-    if verbose () then (
-      printf "command line:";
-      List.iter (printf " %s") (Array.to_list Sys.argv);
-      print_newline ()
-    );
-
-    (* Dereference the rest of the args. *)
-    let alignment = !alignment in
-    let copy_boot_loader = !copy_boot_loader in
-    let deletes = List.rev !deletes in
-    let dryrun = !dryrun in
-    let expand = match !expand with "" -> None | str -> Some
str in
-    let expand_content = !expand_content in
-    let extra_partition = !extra_partition in
-    let format = match !format with "" -> None | str -> Some
str in
-    let ignores = List.rev !ignores in
-    let lv_expands = List.rev !lv_expands in
-    let machine_readable = !machine_readable in
-    let ntfsresize_force = !ntfsresize_force in
-    let output_format = match !output_format with "" -> None | str
-> Some str in
-    let resizes = List.rev !resizes in
-    let resizes_force = List.rev !resizes_force in
-    let shrink = match !shrink with "" -> None | str -> Some
str in
-    let sparse = !sparse in
-    let unknown_fs_mode = !unknown_fs_mode in
-
-    if alignment < 1 then
-      error (f_"alignment cannot be < 1");
-    let alignment = Int64.of_int alignment in
-
-    let align_first -      match !align_first with
-      | "never" -> `Never
-      | "always" -> `Always
-      | "auto" -> `Auto
-      | _ ->
-        error (f_"unknown --align-first option: use
never|always|auto") in
-
-    let unknown_fs_mode -      match unknown_fs_mode with
-      | "ignore" -> UnknownFsIgnore
-      | "warn" -> UnknownFsWarn
-      | "error" -> UnknownFsError
-      | _ ->
-        error (f_"unknown --unknown-filesystems: use
ignore|warn|error") in
-
-    (* No arguments and machine-readable mode?  Print out some facts
-     * about what this binary supports.  We only need to print out new
-     * things added since this option, or things which depend on features
-     * of the appliance.
-     *)
-    if !disks = [] && machine_readable then (
-      printf "virt-resize\n";
-      printf "ntfsresize-force\n";
-      printf "32bitok\n";
-      printf "128-sector-alignment\n";
-      printf "alignment\n";
-      printf "align-first\n";
-      printf "infile-uri\n";
-      let g = open_guestfs () in
-      g#add_drive "/dev/null";
-      g#launch ();
-      if g#feature_available [| "ntfsprogs"; "ntfs3g" |]
then
-        printf "ntfs\n";
-      if g#feature_available [| "btrfs" |] then
-        printf "btrfs\n";
-      if g#feature_available [| "xfs" |] then
-        printf "xfs\n";
-      exit 0
-    );
-
-    (* Verify we got exactly 2 disks. *)
-    let infile, outfile -      match List.rev !disks with
-      | [infile; outfile] -> infile, outfile
-      | _ ->
-        error (f_"usage is: %s [--options] indisk outdisk") prog in
-
-    (* Simple-minded check that the user isn't trying to use the
-     * same disk for input and output.
-     *)
-    if infile = outfile then
-      error (f_"you cannot use the same disk image for input and
output");
-
-    (* infile can be a URI. *)
-    let infile -      try (infile, URI.parse_uri infile)
-      with Invalid_argument "URI.parse_uri" ->
-        error (f_"error parsing URI '%s'. Look for error messages
printed above.")
-          infile in
-
-    infile, outfile, align_first, alignment, copy_boot_loader,
-    deletes,
-    dryrun, expand, expand_content, extra_partition, format, ignores,
-    lv_expands, machine_readable, ntfsresize_force, output_format,
-    resizes, resizes_force, shrink, sparse, unknown_fs_mode in
+  let cmdline = parse_cmdline () in
 
   (* Default to true, since NTFS/btrfs/XFS support are usually available. *)
   let ntfs_available = ref true in
@@ -330,14 +148,17 @@ read the man page virt-resize(1).
   (* Add in and out disks to the handle and launch. *)
   let connect_both_disks ()      let g = open_guestfs () in
-    let _, { URI.path = path; protocol = protocol;
-             server = server; username = username;
-             password = password } = infile in
-    g#add_drive ?format ~readonly:true ~protocol ?server ?username
?secret:password path;
+    let { URI.path = path; protocol = protocol;
+          server = server; username = username;
+          password = password } = cmdline.infile_uri in
+    g#add_drive ?format:cmdline.format ~readonly:true
+                ~protocol ?server ?username ?secret:password path;
     (* The output disk is being created, so use cache=unsafe here. *)
-    g#add_drive ?format:output_format ~readonly:false
~cachemode:"unsafe"
-      outfile;
-    if not (quiet ()) then Progress.set_up_progress_bar ~machine_readable g;
+    g#add_drive ?format:cmdline.output_format ~readonly:false
+                ~cachemode:"unsafe" cmdline.outfile;
+    if not (quiet ()) then
+      Progress.set_up_progress_bar
+        ~machine_readable:cmdline.machine_readable g;
     g#launch ();
 
     (* Set the filter to /dev/sda, in case there are any rogue
@@ -354,7 +175,7 @@ read the man page virt-resize(1).
   in
 
   let g -    message (f_"Examining %s") (fst infile);
+    message (f_"Examining %s") cmdline.infile;
     let g = connect_both_disks () in
     g in
 
@@ -369,8 +190,8 @@ read the man page virt-resize(1).
     let insize = g#blockdev_getsize64 "/dev/sda" in
     let outsize = g#blockdev_getsize64 "/dev/sdb" in
     if verbose () then (
-      printf "%s size %Ld bytes\n" (fst infile) insize;
-      printf "%s size %Ld bytes\n" outfile outsize
+      printf "%s size %Ld bytes\n" cmdline.infile insize;
+      printf "%s size %Ld bytes\n" cmdline.outfile outsize
     );
     sectsize, insize, outsize in
 
@@ -390,10 +211,10 @@ read the man page virt-resize(1).
   (* Check the disks are at least as big as the bootloader. *)
   if insize < Int64.of_int max_bootloader then
     error (f_"%s: file is too small to be a disk image (%Ld bytes)")
-      (fst infile) insize;
+          cmdline.infile insize;
   if outsize < Int64.of_int max_bootloader then
     error (f_"%s: file is too small to be a disk image (%Ld bytes)")
-      outfile outsize;
+          cmdline.outfile outsize;
 
   (* Get the source partition type. *)
   let parttype, parttype_string @@ -405,7 +226,7 @@ read the man page
virt-resize(1).
     | "gpt" -> GPT, "gpt"
     | _ ->
       error (f_"%s: unknown partition table type\nvirt-resize only
supports MBR (DOS) and GPT partition tables.")
-        (fst infile) in
+            cmdline.infile in
 
   (* Build a data structure describing the source disk's partition layout.
*)
   let get_partition_content @@ -549,7 +370,7 @@ read the man page
virt-resize(1).
    * a particular partition or LV, and what method to use.
    *)
   let can_expand_content -    if expand_content then
+    if cmdline.expand_content then
       function
       | ContentUnknown -> false
       | ContentPV _ -> true
@@ -563,7 +384,7 @@ read the man page virt-resize(1).
       fun _ -> false
 
   and expand_content_method -    if expand_content then
+    if cmdline.expand_content then
       function
       | ContentUnknown -> assert false
       | ContentPV _ -> PVResize
@@ -597,7 +418,7 @@ read the man page virt-resize(1).
         try Hashtbl.find hash name
         with Not_found ->
           error (f_"%s: partition not found in the source disk image (this
error came from '%s' option on the command line).  Try running this
command: virt-filesystems --partitions --long -a %s")
-          name option (fst infile) in
+                name option cmdline.infile in
 
       if partition.p_operation = OpIgnore then
         error (f_"%s: partition already ignored, you cannot use it in
'%s' option")
@@ -614,14 +435,14 @@ read the man page virt-resize(1).
     fun dev ->
       let p = find_partition ~option:"--ignore" dev in
       p.p_operation <- OpIgnore
-  ) ignores;
+  ) cmdline.ignores;
 
   (* Handle --delete option. *)
   List.iter (
     fun dev ->
       let p = find_partition ~option:"--delete" dev in
       p.p_operation <- OpDelete
-  ) deletes;
+  ) cmdline.deletes;
 
   (* Helper function to mark a partition for resizing.  It prevents the
    * user from trying to mark the same partition twice.  If the force
@@ -696,8 +517,9 @@ read the man page virt-resize(1).
     mark_partition_for_resize ~option ~force p newsize
   in
 
-  List.iter (do_resize ~option:"--resize") resizes;
-  List.iter (do_resize ~option:"--resize-force" ~force:true)
resizes_force;
+  List.iter (do_resize ~option:"--resize") cmdline.resizes;
+  List.iter (do_resize ~option:"--resize-force" ~force:true)
+            cmdline.resizes_force;
 
   (* Helper function calculates the surplus space, given the total
    * required so far for the current partition layout, compared to
@@ -727,7 +549,8 @@ read the man page virt-resize(1).
         maxl64 [gpt_start_sects; max_bootloader_sects; first_part_start_sects]
in
 
       (* Maximum space lost because of alignment of partitions. *)
-      let alignment_sects = alignment *^ Int64.of_int (nr_partitions + 1) in
+      let alignment_sects = cmdline.alignment *^
+                              Int64.of_int (nr_partitions + 1) in
 
       (* Add up the total max. overhead. *)
       let overhead_sects @@ -754,16 +577,16 @@ read the man page
virt-resize(1).
   in
 
   (* Handle --expand and --shrink options. *)
-  if expand <> None && shrink <> None then
+  if cmdline.expand <> None && cmdline.shrink <> None then
     error (f_"you cannot use options --expand and --shrink
together");
 
-  if expand <> None || shrink <> None then (
+  if cmdline.expand <> None || cmdline.shrink <> None then (
     let surplus = calculate_surplus () in
 
     if verbose () then
       printf "surplus before --expand or --shrink: %Ld\n" surplus;
 
-    (match expand with
+    (match cmdline.expand with
      | None -> ()
      | Some dev ->
          if surplus < 0L then
@@ -775,7 +598,7 @@ read the man page virt-resize(1).
          let oldsize = p.p_part.G.part_size in
          mark_partition_for_resize ~option p (oldsize +^ surplus)
     );
-    (match shrink with
+    (match cmdline.shrink with
      | None -> ()
      | Some dev ->
          if surplus > 0L then
@@ -812,14 +635,14 @@ read the man page virt-resize(1).
         try Hashtbl.find hash name
         with Not_found ->
           error (f_"%s: logical volume not found in the source disk image
(this error came from '--lv-expand' option on the command line).  Try
running this command: virt-filesystems --logical-volumes --long -a %s")
-            name (fst infile) in
+                name cmdline.infile in
       lv.lv_operation <- LVOpExpand
-  ) lv_expands;
+  ) cmdline.lv_expands;
 
   (* In case we need to error out on unknown/unhandled filesystems,
    * iterate on what we need to resize/expand.
    *)
-  (match unknown_fs_mode with
+  (match cmdline.unknown_fs_mode with
   | UnknownFsIgnore -> ()
   | UnknownFsWarn -> ()
   | UnknownFsError ->
@@ -933,7 +756,7 @@ read the man page virt-resize(1).
     if surplus > 0L then (
       let text          sprintf (f_"There is a surplus of %s.")
(human_size surplus) ^
-        if extra_partition then (
+        if cmdline.extra_partition then (
           if surplus >= min_extra_partition then
             s_"  An extra partition will be created for the surplus."
           else
@@ -948,7 +771,7 @@ read the man page virt-resize(1).
     flush stdout
   );
 
-  if dryrun then exit 0;
+  if cmdline.dryrun then exit 0;
 
   (* Create a partition table.
    *
@@ -972,7 +795,7 @@ read the man page virt-resize(1).
     (* Try hard to initialize the partition table.  This might involve
      * relaunching another handle.
      *)
-    message (f_"Setting up initial partition table on %s") outfile;
+    message (f_"Setting up initial partition table on %s")
cmdline.outfile;
 
     let last_error = ref "" in
     let rec initialize_partition_table g attempts @@ -1002,7 +825,7 @@ read the
man page virt-resize(1).
    * https://secure.wikimedia.org/wikipedia/en/wiki/Master_Boot_Record
    * https://secure.wikimedia.org/wikipedia/en/wiki/GUID_Partition_Table
    *)
-  if copy_boot_loader then (
+  if cmdline.copy_boot_loader then (
     let bootsect = g#pread_device "/dev/sda" 446 0L in
     if String.length bootsect < 446 then
       error (f_"pread-device: short read");
@@ -1059,7 +882,7 @@ read the man page virt-resize(1).
       | n -> 1 + alignment_of (n /^ 2L)
     in
 
-    match align_first, can_fix_boot_loader () with
+    match cmdline.align_first, can_fix_boot_loader () with
     | `Never, _
     | `Auto, false -> false
     | `Always, _
@@ -1087,7 +910,7 @@ read the man page virt-resize(1).
         let size = div_roundup64 p.p_part.G.part_size sectsize in
         (* Start of next partition + alignment. *)
         let end_ = start +^ size in
-        let next = roundup64 end_ alignment in
+        let next = roundup64 end_ cmdline.alignment in
 
         if verbose () then
           printf "target partition %d: ignore or copy: start=%Ld
end=%Ld\n%!"
@@ -1101,7 +924,7 @@ read the man page virt-resize(1).
         let size = div_roundup64 newsize sectsize in
         (* Start of next partition + alignment. *)
         let next = start +^ size in
-        let next = roundup64 next alignment in
+        let next = roundup64 next cmdline.alignment in
 
         if verbose () then
           printf "target partition %d: resize: newsize=%Ld start=%Ld
end=%Ld\n%!"
@@ -1113,7 +936,7 @@ read the man page virt-resize(1).
 
     | [] ->
       (* Create the surplus partition if there is room for it. *)
-      if extra_partition && surplus >= min_extra_partition then (
+      if cmdline.extra_partition && surplus >= min_extra_partition
then (
         [ {
           (* Since this partition has no source, this data is
            * meaningless and not used since the operation is
@@ -1141,7 +964,7 @@ read the man page virt-resize(1).
      *)
     let start        if align_first_partition_and_fix_bootloader then
-        alignment
+        cmdline.alignment
       else
         (* Preserve the existing start, but convert to sectors. *)
         (List.hd partitions).p_part.G.part_start /^ sectsize in
@@ -1203,7 +1026,8 @@ read the man page virt-resize(1).
 
         (match p.p_type with
          | ContentUnknown | ContentPV _ | ContentFS _ ->
-           g#copy_device_to_device ~size:copysize ~sparse source target
+           g#copy_device_to_device ~size:copysize ~sparse:cmdline.sparse
+                                   source target
 
          | ContentExtendedPartition ->
            (* You can't just copy an extended partition by name, eg.
@@ -1288,9 +1112,12 @@ read the man page virt-resize(1).
 
       let g = open_guestfs () in
       (* The output disk is being created, so use cache=unsafe here. *)
-      g#add_drive ?format:output_format ~readonly:false
~cachemode:"unsafe"
-        outfile;
-      if not (quiet ()) then Progress.set_up_progress_bar ~machine_readable g;
+      g#add_drive ?format:cmdline.output_format
+                  ~readonly:false ~cachemode:"unsafe"
+                  cmdline.outfile;
+      if not (quiet ()) then
+        Progress.set_up_progress_bar
+          ~machine_readable:cmdline.machine_readable g;
       g#launch ();
 
       g (* Return new handle. *)
@@ -1310,7 +1137,7 @@ read the man page virt-resize(1).
       function
       | PVResize -> g#pvresize target
       | Resize2fs -> g#resize2fs target
-      | NTFSResize -> g#ntfsresize ~force:ntfsresize_force target
+      | NTFSResize -> g#ntfsresize ~force:cmdline.ntfsresize_force target
       | BtrfsFilesystemResize -> with_mounted target
g#btrfs_filesystem_resize
       | XFSGrowFS -> with_mounted target g#xfs_growfs
     in
@@ -1364,7 +1191,7 @@ read the man page virt-resize(1).
    * and therefore bypasses the host cache).  In general you should not
    * use cache=none.
    *)
-  Fsync.file outfile;
+  Fsync.file cmdline.outfile;
 
   if not (quiet ()) then (
     print_newline ();
-- 
2.5.0

---
 resize/resize.ml | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/resize/resize.ml b/resize/resize.ml
index 4add4ee..a0fa347 100644
--- a/resize/resize.ml
+++ b/resize/resize.ml
@@ -174,10 +174,8 @@ let main ()      g
   in
 
-  let g -    message (f_"Examining %s") cmdline.infile;
-    let g = connect_both_disks () in
-    g in
+  message (f_"Examining %s") cmdline.infile;
+  let g = connect_both_disks () in
 
   (* Get the size in bytes of each disk.
    *
-- 
2.5.0

Hi Rich,

Does that means that all the functions provided by virt-resize will be migrated
to virt-builder?
Does the command virt-resize will totally be abandoned? 
We may need to modify all the virt-resize test cases if so.

-- 
Thanks & Best regards,
Chen Xiang Hua 
Raycom office Beijing (NAY), Red Hat Inc.
Red Hat Telephony: 86 10 62608040
internal extension: 8388040
Team: Virt QE
IRC: xchen@#S1, #virt

----- Original Message -----
From: "Richard W.M. Jones" <rjones@redhat.com>
To: libguestfs@redhat.com
Sent: Tuesday, December 15, 2015 5:26:08 AM
Subject: [Libguestfs] [PATCH 0/2] resize: Split out the command line parsing
into Cmdline

Some simple refactoring of virt-resize.

I originally had the idea that we could turn virt-resize into a
library (cf. virt-customize) and use it from virt-builder, but I now
don't think that would make any meaningful difference.  In particular
we'd still have to open the handle the same number of times.

These two patches are left over from my work on that.

Rich.

_______________________________________________
Libguestfs mailing list
Libguestfs@redhat.com
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On Wed, Dec 16, 2015 at 05:28:22AM -0500, Xiang Hua Chen
wrote:
> Hi Rich,
> 
> Does that means that all the functions provided by virt-resize will be
migrated to virt-builder?
> Does the command virt-resize will totally be abandoned? 
> We may need to modify all the virt-resize test cases if so.
No it has no effect on anything, it's just an internal change
in code organization.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines.  Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top