Richard W.M. Jones
2015-Aug-27 16:32 UTC
[Libguestfs] [PATCH] customize: Use setarch when running commands on i686 guest (RHBZ#1256405).
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 if verbose () then printf "running command:\n%s\n%!" cmd; try ignore (g#sh cmd) -- 2.5.0
Richard W.M. Jones
2015-Aug-27 16:38 UTC
Re: [Libguestfs] [PATCH] customize: Use setarch when running commands on i686 guest (RHBZ#1256405).
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 inUnfortunately 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
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