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solarflow99

2017-Apr-07 01:57 UTC

[Libguestfs] difficulty using virt-v2v with OVA

I have a Fedora 24 system I can already get this working for most OVA
files, just the BSD and atomic ones weren't recognized.  Assuming my
version of virt-v2v is just old, I installed rawhide on a different system
and tried with virt-v2v-1.37.8-1.fc27.x86_64 and now its having another
problem.  Is there a known version of virt-v2v I should be using?  Here is
the output from the rawhide attempt happens for any OVA file I try:



# virt-v2v -v -x -i ova graylog.ova -o qemu -of qcow2 -os /var/tmp
--qemu-boot
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: create: flags = 0, handle = 0x1e984e0, program = virt-v2v
libguestfs: trace: get_cachedir
libguestfs: trace: get_cachedir = "/var/tmp"
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: create: flags = 0, handle = 0x1e988d0, program = virt-v2v
libguestfs: trace: get_cachedir
libguestfs: trace: get_cachedir = "/var/tmp"
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: create: flags = 0, handle = 0x1e993e0, program = virt-v2v
libguestfs: trace: set_trace true
libguestfs: trace: set_trace = 0
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: trace: get_cachedir
libguestfs: trace: get_cachedir = "/var/tmp"
virt-v2v: libguestfs 1.37.8fedora=27,release=1.fc27,libvirt (x86_64)
libvirt version: 3.2.0
[   0.0] Opening the source -i ova graylog.ova
qemu-img info json:'{ "file": { "driver":
"raw", "offset": 512, "size":
512, "file": { "filename":
"/tmp/v2vqemuimgtstee6f2b.img" } } }' >/dev/null
qemu-img supports "offset" and "size" in json URLs: true
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: create: flags = 0, handle = 0x1e98ee0, program = virt-v2v
libguestfs: trace: set_trace true
libguestfs: trace: set_trace = 0
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: trace: get_backend
libguestfs: trace: get_backend = "libvirt"
libvirt supports  "raw" driver in json URL: true
tar -tf 'graylog.ova'
tar '-xf' 'graylog.ova' '-C'
'/var/tmp/ova.bRNpvE' 'graylog.ovf'
'graylog.mf'
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: create: flags = 0, handle = 0x1ebe250, program = virt-v2v
libguestfs: trace: set_trace true
libguestfs: trace: set_trace = 0
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: trace: get_backend
libguestfs: trace: get_backend = "libvirt"
virt-v2v: warning: making OVA directory public readable to work around
libvirt bug https://bugzilla.redhat.com/1045069
chmod '-R' 'go=u,go-w' '/var/tmp/ova.bRNpvE'
'graylog.ova'
processing manifest /var/tmp/ova.bRNpvE/graylog.mf
tar xOf 'graylog.ova' 'graylog.ovf' | sha1sum
tar xOf 'graylog.ova' 'graylog-disk1.vmdk' | sha1sum
tar tRvf 'graylog.ova'
json: json:{ "file": { "driver": "raw",
"offset": 10240, "size":
1146813952, "file": { "driver": "file",
"filename": "/root/graylog.ova" } }
}
    source name: graylog
hypervisor type: vmware
         memory: 2147483648 (bytes)
       nr vCPUs: 1
     CPU vendor:
      CPU model:
   CPU topology: sockets: - cores/socket: - threads/core: -
   CPU features:
       firmware: bios
        display:
          video:
          sound:
disks:
    json:{ "file": { "driver": "raw",
"offset": 10240, "size": 1146813952,
"file": { "driver": "file", "filename":
"/root/graylog.ova" } } } (vmdk)
[scsi]
removable media:

NICs:
    Network "Ethernet 1"

check_host_free_space: overlay_dir=/var/tmp free_space=42292809728
[   3.1] Creating an overlay to protect the source from being modified
qemu-img 'create' '-q' '-f' 'qcow2' '-b'
'json:{ "file": { "driver": "raw",
"offset": 10240, "size": 1146813952, "file": {
"driver": "file",
"filename": "/root/graylog.ova" } } }' '-o'
'compat=1.1,backing_fmt=vmdk'
'/var/tmp/v2vovle91365.qcow2'
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: create: flags = 0, handle = 0x1effb80, program = virt-v2v
libguestfs: trace: set_trace true
libguestfs: trace: set_trace = 0
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: trace: disk_has_backing_file "/var/tmp/v2vovle91365.qcow2"
libguestfs: command: run: qemu-img
libguestfs: command: run: \ info
libguestfs: command: run: \ --output json
libguestfs: command: run: \ /dev/fd/3
libguestfs: parse_json: qemu-img info JSON output:\n{\n
"backing-filename-format": "vmdk",\n   
"virtual-size": 21474836480,\n
"filename": "/dev/fd/3",\n    "cluster-size":
65536,\n    "format":
"qcow2",\n    "actual-size": 200704,\n   
"format-specific": {\n
"type": "qcow2",\n        "data": {\n           
"compat":
"1.1",\n            "lazy-refcounts": false,\n           
"refcount-bits":
16,\n            "corrupt": false\n        }\n    },\n
"full-backing-filename": "json:{ \"file\": {
\"driver\": \"raw\",
\"offset\": 10240, \"size\": 1146813952, \"file\":
{ \"driver\": \"file\",
\"filename\": \"/root/graylog.ova\" } } }",\n   
"backing-filename":
"json:{ \"file\": { \"driver\": \"raw\",
\"offset\": 10240, \"size\":
1146813952, \"file\": { \"driver\": \"file\",
\"filename\":
\"/root/graylog.ova\" } } }",\n    "dirty-flag":
false\n}\n\n
libguestfs: trace: disk_has_backing_file = 1
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: create: flags = 0, handle = 0x1effed0, program = virt-v2v
libguestfs: trace: set_trace true
libguestfs: trace: set_trace = 0
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: trace: disk_virtual_size "/var/tmp/v2vovle91365.qcow2"
libguestfs: command: run: qemu-img
libguestfs: command: run: \ info
libguestfs: command: run: \ --output json
libguestfs: command: run: \ /dev/fd/3
libguestfs: parse_json: qemu-img info JSON output:\n{\n
"backing-filename-format": "vmdk",\n   
"virtual-size": 21474836480,\n
"filename": "/dev/fd/3",\n    "cluster-size":
65536,\n    "format":
"qcow2",\n    "actual-size": 200704,\n   
"format-specific": {\n
"type": "qcow2",\n        "data": {\n           
"compat":
"1.1",\n            "lazy-refcounts": false,\n           
"refcount-bits":
16,\n            "corrupt": false\n        }\n    },\n
"full-backing-filename": "json:{ \"file\": {
\"driver\": \"raw\",
\"offset\": 10240, \"size\": 1146813952, \"file\":
{ \"driver\": \"file\",
\"filename\": \"/root/graylog.ova\" } } }",\n   
"backing-filename":
"json:{ \"file\": { \"driver\": \"raw\",
\"offset\": 10240, \"size\":
1146813952, \"file\": { \"driver\": \"file\",
\"filename\":
\"/root/graylog.ova\" } } }",\n    "dirty-flag":
false\n}\n\n
libguestfs: trace: disk_virtual_size = 21474836480
[   3.2] Initializing the target -o qemu -os /var/tmp --qemu-boot
[   3.2] Opening the overlay
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: create: flags = 0, handle = 0x1f00280, program = virt-v2v
libguestfs: trace: set_trace true
libguestfs: trace: set_trace = 0
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: trace: set_identifier "v2v"
libguestfs: trace: v2v: set_identifier = 0
libguestfs: trace: v2v: get_memsize
libguestfs: trace: v2v: get_memsize = 500
libguestfs: trace: v2v: set_memsize 2000
libguestfs: trace: v2v: set_memsize = 0
libguestfs: trace: v2v: set_network true
libguestfs: trace: v2v: set_network = 0
libguestfs: trace: v2v: add_drive "/var/tmp/v2vovle91365.qcow2"
"format:qcow2" "cachemode:unsafe"
"discard:besteffort" "copyonread:true"
libguestfs: trace: v2v: add_drive = 0
libguestfs: trace: v2v: launch
libguestfs: trace: v2v: get_tmpdir
libguestfs: trace: v2v: get_tmpdir = "/tmp"
libguestfs: trace: v2v: version
libguestfs: trace: v2v: version = <struct guestfs_version = major: 1,
minor: 37, release: 8, extra: fedora=27,release=1.fc27,libvirt, >
libguestfs: trace: v2v: get_backend
libguestfs: trace: v2v: get_backend = "libvirt"
libguestfs: launch: program=virt-v2v
libguestfs: launch: identifier=v2v
libguestfs: launch: version=1.37.8fedora=27,release=1.fc27,libvirt
libguestfs: launch: backend registered: unix
libguestfs: launch: backend registered: uml
libguestfs: launch: backend registered: libvirt
libguestfs: launch: backend registered: direct
libguestfs: launch: backend=libvirt
libguestfs: launch: tmpdir=/tmp/libguestfsu6lY8x
libguestfs: launch: umask=0022
libguestfs: launch: euid=0
libguestfs: libvirt version = 3002000 (3.2.0)
libguestfs: guest random name = guestfs-jf27nn19mslze1id
libguestfs: connect to libvirt
libguestfs: opening libvirt handle: URI = qemu:///system, auth default+wrapper,
flags = 0
libguestfs: successfully opened libvirt handle: conn = 0x1f00900
libguestfs: qemu version (reported by libvirt) = 2008093 (2.8.93)
libguestfs: get libvirt capabilities
libguestfs: parsing capabilities XML
libguestfs: trace: v2v: get_backend_setting "force_tcg"
libguestfs: trace: v2v: get_backend_setting = NULL (error)
libguestfs: trace: v2v: get_backend_setting "internal_libvirt_label"
libguestfs: trace: v2v: get_backend_setting = NULL (error)
libguestfs: trace: v2v: get_backend_setting
"internal_libvirt_imagelabel"
libguestfs: trace: v2v: get_backend_setting = NULL (error)
libguestfs: trace: v2v: get_backend_setting
"internal_libvirt_norelabel_disks"
libguestfs: trace: v2v: get_backend_setting = NULL (error)
libguestfs: trace: v2v: get_backend_setting "network_bridge"
libguestfs: trace: v2v: get_backend_setting = NULL (error)
libguestfs: build appliance
libguestfs: trace: v2v: get_cachedir
libguestfs: trace: v2v: get_cachedir = "/var/tmp"
libguestfs: begin building supermin appliance
libguestfs: run supermin
libguestfs: command: run: /usr/bin/supermin
libguestfs: command: run: \ --build
libguestfs: command: run: \ --verbose
libguestfs: command: run: \ --if-newer
libguestfs: command: run: \ --lock /var/tmp/.guestfs-0/lock
libguestfs: command: run: \ --copy-kernel
libguestfs: command: run: \ -f ext2
libguestfs: command: run: \ --host-cpu x86_64
libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d
libguestfs: command: run: \ -o /var/tmp/.guestfs-0/appliance.d
supermin: version: 5.1.17
supermin: rpm: detected RPM version 4.13
supermin: package handler: fedora/rpm
supermin: acquiring lock on /var/tmp/.guestfs-0/lock
supermin: if-newer: output does not need rebuilding
libguestfs: finished building supermin appliance
libguestfs: trace: v2v: disk_create "/tmp/libguestfsu6lY8x/overlay1"
"qcow2" -1
"backingfile:/var/tmp/.guestfs-0/appliance.d/root"
"backingformat:raw"
libguestfs: command: run: qemu-img
libguestfs: command: run: \ create
libguestfs: command: run: \ -f qcow2
libguestfs: command: run: \ -o
backing_file=/var/tmp/.guestfs-0/appliance.d/root,backing_fmt=raw
libguestfs: command: run: \ /tmp/libguestfsu6lY8x/overlay1
Formatting '/tmp/libguestfsu6lY8x/overlay1', fmt=qcow2 size=4294967296
backing_file=/var/tmp/.guestfs-0/appliance.d/root backing_fmt=raw
encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16
libguestfs: trace: v2v: disk_create = 0
libguestfs: trace: v2v: get_sockdir
libguestfs: trace: v2v: get_sockdir = "/tmp"
libguestfs: set_socket_create_context: getcon failed: (none): Invalid
argument [you can ignore this message if you are not using SELinux + sVirt]
libguestfs: clear_socket_create_context: setsockcreatecon failed: NULL:
Invalid argument [you can ignore this message if you are not using SELinux
+ sVirt]
libguestfs: create libvirt XML
libguestfs: trace: v2v: get_cachedir
libguestfs: trace: v2v: get_cachedir = "/var/tmp"
libguestfs: libvirt XML:\n<?xml version="1.0"?>\n<domain
type="kvm"
xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0">\n
<name>guestfs-jf27nn19mslze1id</name>\n  <memory
unit="MiB">2000</memory>\n  <currentMemory
unit="MiB">2000</currentMemory>\n  <cpu
mode="host-passthrough">\n
<model fallback="allow"/>\n  </cpu>\n 
<vcpu>1</vcpu>\n  <clock
offset="utc">\n    <timer name="rtc"
tickpolicy="catchup"/>\n    <timer
name="pit" tickpolicy="delay"/>\n    <timer
name="hpet" present="no"/>\n
</clock>\n  <os>\n    <type>hvm</type>\n
<kernel>/var/tmp/.guestfs-0/appliance.d/kernel</kernel>\n
<initrd>/var/tmp/.guestfs-0/appliance.d/initrd</initrd>\n
<cmdline>panic=1 console=ttyS0 edd=off udevtimeout=6000
udev.event-timeout=6000 no_timer_check printk.time=1 cgroup_disable=memory
usbcore.nousb cryptomgr.notests tsc=reliable 8250.nr_uarts=1 root=/dev/sdb
selinux=0 guestfs_verbose=1 guestfs_network=1 TERM=xterm
guestfs_identifier=v2v</cmdline>\n    <bios
useserial="yes"/>\n  </os>\n
<on_reboot>destroy</on_reboot>\n  <devices>\n    <rng
model="virtio">\n      <backend
model="random">/dev/urandom</backend>\n
</rng>\n    <controller type="scsi" index="0"
model="virtio-scsi"/>\n
<disk device="disk" type="file">\n      <source
file="/var/tmp/v2vovle91365.qcow2"/>\n      <target
dev="sda"
bus="scsi"/>\n      <driver name="qemu"
type="qcow2" cache="unsafe"
discard="unmap"/>\n      <address type="drive"
controller="0" bus="0"
target="0" unit="0"/>\n    </disk>\n    <disk
type="file"
device="disk">\n      <source
file="/tmp/libguestfsu6lY8x/overlay1"/>\n      <target
dev="sdb"
bus="scsi"/>\n      <driver name="qemu"
type="qcow2"
cache="unsafe"/>\n      <address type="drive"
controller="0" bus="0"
target="1" unit="0"/>\n      <shareable/>\n   
</disk>\n    <serial
type="unix">\n      <source mode="connect"
path="/tmp/libguestfs7bRh8r/console.sock"/>\n      <target
port="0"/>\n
</serial>\n    <channel type="unix">\n      <source
mode="connect"
path="/tmp/libguestfs7bRh8r/guestfsd.sock"/>\n      <target
type="virtio"
name="org.libguestfs.channel.0"/>\n    </channel>\n   
<interface
type="bridge">\n      <source bridge="virbr0"/>\n  
<model
type="virtio"/>\n    </interface>\n    <controller
type="usb"
model="none"/>\n    <memballoon model="none"/>\n 
</devices>\n
<qemu:commandline>\n    <qemu:env name="TMPDIR"
value="/var/tmp"/>\n
</qemu:commandline>\n</domain>\n
libguestfs: trace: v2v: get_cachedir
libguestfs: trace: v2v: get_cachedir = "/var/tmp"
libguestfs: command: run: ls
libguestfs: command: run: \ -a
libguestfs: command: run: \ -l
libguestfs: command: run: \ -R
libguestfs: command: run: \ -Z /var/tmp/.guestfs-0
libguestfs: /var/tmp/.guestfs-0:
libguestfs: total 52
libguestfs: drwxr-xr-x  3 root root ?                           4096 Apr  6
21:50 .
libguestfs: drwxrwxrwt. 8 root root system_u:object_r:tmp_t:s0  4096 Apr  6
21:50 ..
libguestfs: drwxr-xr-x  2 root root ?                           4096 Apr  6
21:47 appliance.d
libguestfs: -rw-r--r--  1 root root ?                              0 Apr  6
21:32 lock
libguestfs: -rw-r--r--  1 root root ?                          10116 Apr  6
21:33 qemu.devices
libguestfs: -rw-r--r--  1 root root ?                          24500 Apr  6
21:33 qemu.help
libguestfs: -rw-r--r--  1 root root ?                             35 Apr  6
21:33 qemu.stat
libguestfs:
libguestfs: /var/tmp/.guestfs-0/appliance.d:
libguestfs: total 263516
libguestfs: drwxr-xr-x 2 root root ?       4096 Apr  6 21:47 .
libguestfs: drwxr-xr-x 3 root root ?       4096 Apr  6 21:50 ..
libguestfs: -rw-r--r-- 1 root root ?     567296 Apr  6 21:50 initrd
libguestfs: -rwxr-xr-x 1 root root ?    8024664 Apr  6 21:50 kernel
libguestfs: -rw-r--r-- 1 root root ? 4294967296 Apr  6 21:50 root
libguestfs: command: run: ls
libguestfs: command: run: \ -a
libguestfs: command: run: \ -l
libguestfs: command: run: \ -Z /tmp/libguestfs7bRh8r
libguestfs: total 0
libguestfs: drwxr-xr-x  2 root root ?  80 Apr  6 21:50 .
libguestfs: drwxrwxrwt 11 root root ? 260 Apr  6 21:50 ..
libguestfs: srw-rw----  1 root qemu ?   0 Apr  6 21:50 console.sock
libguestfs: srw-rw----  1 root qemu ?   0 Apr  6 21:50 guestfsd.sock
libguestfs: launch libvirt guest
libguestfs: clear_socket_create_context: setsockcreatecon failed: NULL:
Invalid argument [you can ignore this message if you are not using SELinux
+ sVirt]
libguestfs: trace: v2v: launch = -1 (error)
virt-v2v: error: libguestfs error: could not create appliance through
libvirt.

Try running qemu directly without libvirt using this environment variable:
export LIBGUESTFS_BACKEND=direct

Original error from libvirt: Cannot access backing file
'/root/graylog.ova'
of storage file '/var/tmp/v2vovle91365.qcow2' (as uid:107, gid:107):
Permission denied [code=38 int1=13]
rm -rf '/var/tmp/ova.bRNpvE'
rm -rf '/var/tmp/null.ESbL2T'
libguestfs: trace: v2v: close
libguestfs: closing guestfs handle 0x1f00280 (state 0)
libguestfs: command: run: rm
libguestfs: command: run: \ -rf /tmp/libguestfsu6lY8x
libguestfs: command: run: rm
libguestfs: command: run: \ -rf /tmp/libguestfs7bRh8r
libguestfs: trace: close
libguestfs: closing guestfs handle 0x1effed0 (state 0)
libguestfs: trace: close
libguestfs: closing guestfs handle 0x1effb80 (state 0)
libguestfs: trace: close
libguestfs: closing guestfs handle 0x1ebe250 (state 0)
libguestfs: trace: close
libguestfs: closing guestfs handle 0x1e98ee0 (state 0)
libguestfs: trace: close
libguestfs: closing guestfs handle 0x1e993e0 (state 0)
libguestfs: trace: close
libguestfs: closing guestfs handle 0x1e988d0 (state 0)
libguestfs: trace: close
libguestfs: closing guestfs handle 0x1e984e0 (state 0)

Pino Toscano

2017-Apr-07 08:12 UTC

head link

Re: [Libguestfs] difficulty using virt-v2v with OVA

Hi,

On Friday, 7 April 2017 03:57:30 CEST solarflow99 wrote:> I have a Fedora 24 system I can already get this working for most OVA
> files, just the BSD and atomic ones weren't recognized.
BSD systems are not currently supported by virt-v2v, they need an
ad-hoc conversion module.

Inspection of Atomic systems currently does not work, see also
https://bugzilla.redhat.com/show_bug.cgi?id=1102241
> Assuming my
> version of virt-v2v is just old, I installed rawhide on a different system
> and tried with virt-v2v-1.37.8-1.fc27.x86_64 and now its having another
> problem.  Is there a known version of virt-v2v I should be using?  Here is
> the output from the rawhide attempt happens for any OVA file I try:
> 
> # virt-v2v -v -x -i ova graylog.ova -o qemu -of qcow2 -os /var/tmp
> --qemu-boot
> [...]
> libguestfs: trace: v2v: launch = -1 (error)
> virt-v2v: error: libguestfs error: could not create appliance through
> libvirt.
> 
> Try running qemu directly without libvirt using this environment variable:
> export LIBGUESTFS_BACKEND=direct
> 
> Original error from libvirt: Cannot access backing file
'/root/graylog.ova'
> of storage file '/var/tmp/v2vovle91365.qcow2' (as uid:107,
gid:107):
> Permission denied [code=38 int1=13]
The problem is that the OVA can be read as root only, and you are
running as root.  On Fedora, libguestfs uses libvirt by default to spawn
an appliance, and libvirt uses by default a non-priviledged user when
running as root.

We have a (ugly IMHO) workaround for some of the cases, as you can see
from a snippet of the output:

| virt-v2v: warning: making OVA directory public readable to work around
| libvirt bug https://bugzilla.redhat.com/1045069

but it doesn't always work.  The ways to overcome this problem are
1) run virt-v2v as non-root
2) temporarly export LIBGUESTFS_BACKEND=direct for that virt-v2v
   execution

-- 
Pino Toscano

solarflow99

2017-Apr-08 07:35 UTC

head link

Re: [Libguestfs] difficulty using virt-v2v with OVA

I see.  Thanks for the info!  now I know how I can work around this.  The
BSD system was pfsense, so I can just install new and reload the
configuration, as for atomic, I don't have a large number of them so I will
just install new and docker load the containers in.



On Fri, Apr 7, 2017 at 1:12 AM, Pino Toscano <ptoscano@redhat.com> wrote:
> Hi,
>
> On Friday, 7 April 2017 03:57:30 CEST solarflow99 wrote:
> > I have a Fedora 24 system I can already get this working for most OVA
> > files, just the BSD and atomic ones weren't recognized.
>
> BSD systems are not currently supported by virt-v2v, they need an
> ad-hoc conversion module.
>
> Inspection of Atomic systems currently does not work, see also
> https://bugzilla.redhat.com/show_bug.cgi?id=1102241
>
> > Assuming my
> > version of virt-v2v is just old, I installed rawhide on a different
> system
> > and tried with virt-v2v-1.37.8-1.fc27.x86_64 and now its having
another
> > problem.  Is there a known version of virt-v2v I should be using? 
Here
> is
> > the output from the rawhide attempt happens for any OVA file I try:
> >
> > # virt-v2v -v -x -i ova graylog.ova -o qemu -of qcow2 -os /var/tmp
> > --qemu-boot
> > [...]
> > libguestfs: trace: v2v: launch = -1 (error)
> > virt-v2v: error: libguestfs error: could not create appliance through
> > libvirt.
> >
> > Try running qemu directly without libvirt using this environment
> variable:
> > export LIBGUESTFS_BACKEND=direct
> >
> > Original error from libvirt: Cannot access backing file
> '/root/graylog.ova'
> > of storage file '/var/tmp/v2vovle91365.qcow2' (as uid:107,
gid:107):
> > Permission denied [code=38 int1=13]
>
> The problem is that the OVA can be read as root only, and you are
> running as root.  On Fedora, libguestfs uses libvirt by default to spawn
> an appliance, and libvirt uses by default a non-priviledged user when
> running as root.
>
> We have a (ugly IMHO) workaround for some of the cases, as you can see
> from a snippet of the output:
>
> | virt-v2v: warning: making OVA directory public readable to work around
> | libvirt bug https://bugzilla.redhat.com/1045069
>
> but it doesn't always work.  The ways to overcome this problem are
> 1) run virt-v2v as non-root
> 2) temporarly export LIBGUESTFS_BACKEND=direct for that virt-v2v
>    execution
>
> --
> Pino Toscano

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