[Libguestfs] [PATCH v2 1/2] customize: Give a clear error message if host_cpu not compatible with guest arch.
Richard W.M. Jones
rjones at redhat.com
Fri May 15 14:24:34 UTC 2015
In cases where we are asked to run commands in the guest (eg. options
such as --run-command or --install), give a clear error in the cases
where the guest arch is not compatible with the host arch.
Similar code existed in virt-builder, but I have removed that. Users
will still get an error message, it will just happen a bit later on.
There is a slight change in semantics here, in that architectures are
no longer normalized when matching, but that's probably fine since
`virt-builder -l' prints the exact arch string that people should use.
---
builder/Makefile.am | 8 ++-----
builder/architecture.ml | 41 ---------------------------------
builder/builder.ml | 2 +-
builder/cmdline.ml | 21 ++---------------
builder/uname-c.c | 57 ----------------------------------------------
builder/uname.ml | 27 ----------------------
builder/uname.mli | 28 -----------------------
customize/customize_run.ml | 10 ++++++++
mllib/common_utils.ml | 9 ++++++++
mllib/common_utils.mli | 4 ++++
po/POTFILES | 1 -
po/POTFILES-ml | 2 --
12 files changed, 28 insertions(+), 182 deletions(-)
delete mode 100644 builder/architecture.ml
delete mode 100644 builder/uname-c.c
delete mode 100644 builder/uname.ml
delete mode 100644 builder/uname.mli
diff --git a/builder/Makefile.am b/builder/Makefile.am
index 182f5a4..28b2adf 100644
--- a/builder/Makefile.am
+++ b/builder/Makefile.am
@@ -47,15 +47,12 @@ SOURCES_MLI = \
pxzcat.mli \
setlocale.mli \
sigchecker.mli \
- sources.mli \
- uname.mli
+ sources.mli
SOURCES_ML = \
utils.ml \
pxzcat.ml \
setlocale.ml \
- uname.ml \
- architecture.ml \
ini_reader.ml \
paths.ml \
languages.ml \
@@ -82,8 +79,7 @@ SOURCES_C = \
index-parse.c \
index-parser-c.c \
pxzcat-c.c \
- setlocale-c.c \
- uname-c.c
+ setlocale-c.c
man_MANS =
noinst_DATA =
diff --git a/builder/architecture.ml b/builder/architecture.ml
deleted file mode 100644
index 59c1cf6..0000000
--- a/builder/architecture.ml
+++ /dev/null
@@ -1,41 +0,0 @@
-(* virt-builder
- * Copyright (C) 2014 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.
- *)
-
-open Common_gettext.Gettext
-open Common_utils
-
-open Unix
-
-let filter_arch = function
- | "amd64" | "x86_64" | "x64" -> "x86_64"
- | "powerpc" | "ppc" -> "ppc"
- | arch -> arch
-
-let arch_is_compatible nativearch otherarch =
- let nativearch = filter_arch nativearch in
- let otherarch = filter_arch otherarch in
- match nativearch, otherarch with
- | a, b when a = b -> true
- | "x86_64", "i386" -> true
- | "ppc64", "ppc" -> true
- | "sparc64", "sparc" -> true
- | a, b -> false
-
-let current_arch =
- try filter_arch ((Uname.uname ()).Uname.machine)
- with Unix_error _ -> "unknown"
diff --git a/builder/builder.ml b/builder/builder.ml
index 260281c..663aeef 100644
--- a/builder/builder.ml
+++ b/builder/builder.ml
@@ -227,7 +227,7 @@ let main () =
let item =
try List.find (
fun (name, { Index_parser.arch = a }) ->
- name = arg && arch = Architecture.filter_arch a
+ name = arg && arch = a
) index
with Not_found ->
error (f_"cannot find os-version '%s' with architecture '%s'.\nUse --list to list available guest types.")
diff --git a/builder/cmdline.ml b/builder/cmdline.ml
index ed68e91..7aa0c45 100644
--- a/builder/cmdline.ml
+++ b/builder/cmdline.ml
@@ -296,25 +296,8 @@ read the man page virt-builder(1).
(* Check the architecture. *)
let arch =
match arch with
- | "" -> Architecture.current_arch
- | arch ->
- let target_arch = Architecture.filter_arch arch in
- if Architecture.arch_is_compatible Architecture.current_arch target_arch <> true then (
- let requires_execute_on_guest = List.exists (
- function
- | `Command _ | `InstallPackages _ | `Script _ | `Update -> true
- | `Delete _ | `Edit _ | `FirstbootCommand _ | `FirstbootPackages _
- | `FirstbootScript _ | `Hostname _ | `Link _ | `Mkdir _
- | `Password _ | `RootPassword _ | `Scrub _ | `SSHInject _
- | `Timezone _ | `Truncate _ | `TruncateRecursive _
- | `Upload _ | `Write _ | `Chmod _
- | `CommandsFromFile _ | `CopyIn _ | `Copy _ | `Move _
- | `Touch _ -> false
- ) ops.ops in
- if requires_execute_on_guest then
- error (f_"sorry, cannot run commands on a guest with a different architecture");
- );
- target_arch in
+ | "" -> Config.host_cpu
+ | arch -> arch in
(* If user didn't elect any root password, that means we set a random
* root password.
diff --git a/builder/uname-c.c b/builder/uname-c.c
deleted file mode 100644
index fc63233..0000000
--- a/builder/uname-c.c
+++ /dev/null
@@ -1,57 +0,0 @@
-/* virt-builder
- * Copyright (C) 2014 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.
- */
-
-#include <config.h>
-
-#include <errno.h>
-#include <sys/utsname.h>
-
-#include <caml/alloc.h>
-#include <caml/fail.h>
-#include <caml/memory.h>
-#include <caml/mlvalues.h>
-
-#ifdef HAVE_CAML_UNIXSUPPORT_H
-#include <caml/unixsupport.h>
-#else
-#define Nothing ((value) 0)
-extern void unix_error (int errcode, char * cmdname, value arg) Noreturn;
-#endif
-
-extern value virt_builder_uname (value unit);
-
-value
-virt_builder_uname (value unit)
-{
- CAMLparam0 ();
- CAMLlocal1 (rv);
- struct utsname u;
-
- if (uname (&u) < 0)
- unix_error (errno, (char *) "uname", Val_int (0));
-
- rv = caml_alloc (5, 0);
-
- Store_field (rv, 0, caml_copy_string (u.sysname));
- Store_field (rv, 1, caml_copy_string (u.nodename));
- Store_field (rv, 2, caml_copy_string (u.release));
- Store_field (rv, 3, caml_copy_string (u.version));
- Store_field (rv, 4, caml_copy_string (u.machine));
-
- CAMLreturn (rv);
-}
diff --git a/builder/uname.ml b/builder/uname.ml
deleted file mode 100644
index c370c2c..0000000
--- a/builder/uname.ml
+++ /dev/null
@@ -1,27 +0,0 @@
-(* virt-builder
- * Copyright (C) 2014 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.
- *)
-
-type uname_struct = {
- sysname : string;
- nodename : string;
- release : string;
- version : string;
- machine : string;
-}
-
-external uname : unit -> uname_struct = "virt_builder_uname"
diff --git a/builder/uname.mli b/builder/uname.mli
deleted file mode 100644
index aea441b..0000000
--- a/builder/uname.mli
+++ /dev/null
@@ -1,28 +0,0 @@
-(* virt-builder
- * Copyright (C) 2014 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.
- *)
-
-type uname_struct = {
- sysname : string;
- nodename : string;
- release : string;
- version : string;
- machine : string;
-}
-
-val uname : unit -> uname_struct
-(** [uname] Tiny wrapper to the C [uname]. *)
diff --git a/customize/customize_run.ml b/customize/customize_run.ml
index 4200170..f3924c1 100644
--- a/customize/customize_run.ml
+++ b/customize/customize_run.ml
@@ -30,6 +30,12 @@ let run ~quiet (g : Guestfs.guestfs) root (ops : ops) =
(* Timestamped messages in ordinary, non-debug non-quiet mode. *)
let msg fs = make_message_function ~quiet fs in
+ (* Is the host_cpu compatible with the guest arch? ie. Can we
+ * run commands in this guest?
+ *)
+ let guest_arch = g#inspect_get_arch root in
+ let guest_arch_compatible = guest_arch_compatible guest_arch in
+
(* Based on the guest type, choose a log file location. *)
let logfile =
match g#inspect_get_type root with
@@ -53,6 +59,10 @@ let run ~quiet (g : Guestfs.guestfs) root (ops : ops) =
(* Useful wrapper for scripts. *)
let do_run ~display cmd =
+ if not guest_arch_compatible then
+ error (f_"host cpu (%s) and guest arch (%s) are not compatible, so you cannot use command line options that involve running commands in the guest. Use --firstboot scripts instead.")
+ Config.host_cpu guest_arch;
+
(* Add a prologue to the scripts:
* - Pass environment variables through from the host.
* - Send stdout and stderr to a log file so we capture all output
diff --git a/mllib/common_utils.ml b/mllib/common_utils.ml
index 085089a..d61335b 100644
--- a/mllib/common_utils.ml
+++ b/mllib/common_utils.ml
@@ -715,3 +715,12 @@ let rec mkdir_p path permissions =
* directory. *)
mkdir_p (Filename.dirname path) permissions;
Unix.mkdir path permissions
+
+(* Are guest arch and host_cpu compatible, in terms of being able
+ * to run commands in the libguestfs appliance?
+ *)
+let guest_arch_compatible guest_arch =
+ match Config.host_cpu, guest_arch with
+ | x, y when x = y -> true
+ | "x86_64", ("i386"|"i486"|"i586"|"i686") -> true
+ | _ -> false
diff --git a/mllib/common_utils.mli b/mllib/common_utils.mli
index dcc9d42..ff00218 100644
--- a/mllib/common_utils.mli
+++ b/mllib/common_utils.mli
@@ -165,3 +165,7 @@ val qemu_input_filename : string -> string
val mkdir_p : string -> int -> unit
(** Creates a directory, and its parents if missing. *)
+
+val guest_arch_compatible : string -> bool
+(** Are guest arch and host_cpu compatible, in terms of being able
+ to run commands in the libguestfs appliance? *)
diff --git a/po/POTFILES b/po/POTFILES
index 91005d4..00143db 100644
--- a/po/POTFILES
+++ b/po/POTFILES
@@ -6,7 +6,6 @@ builder/index-struct.c
builder/index-validate.c
builder/pxzcat-c.c
builder/setlocale-c.c
-builder/uname-c.c
cat/cat.c
cat/filesystems.c
cat/log.c
diff --git a/po/POTFILES-ml b/po/POTFILES-ml
index 7f4e096..3fc60e5 100644
--- a/po/POTFILES-ml
+++ b/po/POTFILES-ml
@@ -1,4 +1,3 @@
-builder/architecture.ml
builder/builder.ml
builder/cache.ml
builder/cmdline.ml
@@ -13,7 +12,6 @@ builder/pxzcat.ml
builder/setlocale.ml
builder/sigchecker.ml
builder/sources.ml
-builder/uname.ml
builder/utils.ml
customize/crypt.ml
customize/customize_cmdline.ml
--
2.3.1
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