Problems with adt-virt-qemu and copydown

[Iustin Pop]

Hi,

I found a weird problem with adt-virt-qemu: copydown creates zero-length
files, without copying the contents.

With schroot:

$ adt-virt-schroot sid-amd64
ok
open
ok /tmp/adt-run.2yS4r7
print-execute-command
ok
schroot,-r,-qd,/,-c,sid-amd64-68fd6023-da2d-4169-bc18-c315d5a06dc5,-u,root,--
copydown /etc/passwd /tmp/foo
ok

The schroot command shows:
schroot -r -qd / -c sid-amd64-68fd6023-da2d-4169-bc18-c315d5a06dc5 -u root --
(sid-amd64)# ls -l /tmp/foo
-rw-r--r-- 1 root root 2783 Jul 21 19:57 /tmp/foo

This is as expected. However, with adt-virt-qemu:

$ adt-virt-qemu adt-sid.img 
ok
open
ok /tmp/adt-run.UrjlcT
print-execute-command
ok /tmp/adt-virt-qemu.ochiuli_/runcmd
copydown /etc/passwd /tmp/foo
ok

But:
/tmp/adt-virt-qemu.ochiuli_/runcmd ls -l /tmp/foo
-rw-r--r-- 1 root root 0 Jul 21 19:58 /tmp/foo

So the file is created, but zero-length. Has anyone seen this before? Is
it due to some missing dependencies (I have a custom built kernel)? I
have 9p and 9pnet_virtio built as modules.

Here's the debug log:
copydown /etc/passwd /tmp/foo
adt-virt-qemu: DBG: executing copydown /etc/passwd /tmp/foo
adt-virt-qemu: DBG: ['cmdls', "(['cat'], ['/tmp/adt-virt-qemu.zndhnqtf/runcmd', 'sh', '-ec', 'cat >/tmp/foo'])"]
adt-virt-qemu: DBG: ['srcstdin', "<_io.TextIOWrapper name='/etc/passwd' mode='r' encoding='UTF-8'>", 'deststdout', "<_io.TextIOWrapper name='/dev/null' mode='r' encoding='UTF-8'>", 'devnull_read', <_io.TextIOWrapper name='/dev/null' mode='r' encoding='UTF-8'>]
adt-virt-qemu: DBG:  +< cat
adt-virt-qemu: DBG:  +> /tmp/adt-virt-qemu.zndhnqtf/runcmd sh -ec cat >/tmp/foo
adt-virt-qemu: DBG:  +>?
adt-virt-qemu: DBG:  +<?
ok

(still zero-length file.)

thanks in advance,
iustin
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