On Thu, Aug 27, 2015 at 05:32:31PM +0100, Richard W.M. Jones wrote:
When running (eg) dnf on a 32 bit i686 guest when the host is 64 bit
x86_64, dnf believes it is running on a 64 bit machine and so tries to
install x86_64 packages. We can 'trick' dnf into believing it's a 32
bit machine using the setarch program.
$ virt-builder fedora-22 --arch i686 --install 'gperf'
...
[ 27.4] Installing packages: gperf
...
Running transaction test
Error: Transaction check error:
package libgcc-5.1.1-4.fc22.x86_64 is intended for a different architecture
...
Thanks: Jan Sedlák for finding the solution.
---
customize/customize_run.ml | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/customize/customize_run.ml b/customize/customize_run.ml
index 828c711..2a4c71e 100644
--- a/customize/customize_run.ml
+++ b/customize/customize_run.ml
@@ -59,6 +59,7 @@ let run (g : Guestfs.guestfs) root (ops : ops) =
* - Pass environment variables through from the host.
* - Send stdout and stderr to a log file so we capture all output
* in error messages.
+ * - Use setarch when running x86_64 host + i686 guest.
* Also catch errors and dump the log file completely on error.
*)
let env_vars =
@@ -69,11 +70,16 @@ let run (g : Guestfs.guestfs) root (ops : ops) =
) [ "http_proxy"; "https_proxy"; "ftp_proxy";
"no_proxy" ] in
let env_vars = String.concat "\n" env_vars ^ "\n" in
+ let setarch =
+ match Config.host_cpu, guest_arch with
+ | "x86_64",
("i386"|"i486"|"i586"|"i686") -> "setarch
i686"
+ | _ -> "" in
+
let cmd = sprintf "\
exec >>%s 2>&1
%s
-%s
-" (quote logfile) env_vars cmd in
+%s %s
+" (quote logfile) env_vars setarch cmd in
Unfortunately this doesn't work if the 'cmd' is actually
multiple commands. For example if the command was:
uname -m ; uname -m
then this would be turned into:
setarch i686 uname -m ; uname -m
and that would print:
i686
x86_64
It's tricky because setarch always wants to create a new shell.
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