On April 16, 2024 3:18 pm, Dominik Csapak wrote:
since we want to handle ova files (which are only ovf+vmdks bundled in a
tar file) for import, add code that handles that.
we introduce a valid volname for files contained in ovas like this:
storage:import/archive.ova/disk-1.vmdk
by basically treating the last part of the path as the name for the
contained disk we want.
we then provide 3 functions to use for that:
* copy_needs_extraction: determines from the given volid (like above) if
that needs extraction to copy it, currently only 'import' vtype +
defined format returns true here (if we have more options in the
future, we can of course easily extend that)
* extract_disk_from_import_file: this actually extracts the file from
the archive. Currently only ova is supported, so the extraction with
'tar' is hardcoded, but again we can easily extend/modify that should
we need to.
we currently extract into the import storage in a directory named:
`.tmp_<pid>_<targetvmid>` which should not clash with concurrent
operations (though we do extract it multiple times then)
alternatively we could implement either a 'tmpstorage' parameter,
or use e.g. '/var/tmp/' or similar, but re-using the current storage
seemed ok.
* cleanup_extracted_image: intended to cleanup the extracted images from
above, including the surrounding temporary directory
the helpers could also all live in qemu-server for now, which would also
make extending it to use a different storage, or direct importing via a
pipe easier? see below ;)
we have to modify the `parse_ovf` a bit to handle the missing disk
images, and we parse the size out of the ovf part (since this is
informal only, it should be no problem if we cannot parse it sometimes)
Signed-off-by: Dominik Csapak <d.csa...@proxmox.com>
---
src/PVE/API2/Storage/Status.pm | 1 +
src/PVE/Storage.pm | 59 ++++++++++++++++++++++++++++++++++
src/PVE/Storage/DirPlugin.pm | 13 +++++++-
src/PVE/Storage/OVF.pm | 53 ++++++++++++++++++++++++++----
src/PVE/Storage/Plugin.pm | 5 +++
5 files changed, 123 insertions(+), 8 deletions(-)
diff --git a/src/PVE/API2/Storage/Status.pm b/src/PVE/API2/Storage/Status.pm
index f7e324f..77ed57c 100644
--- a/src/PVE/API2/Storage/Status.pm
+++ b/src/PVE/API2/Storage/Status.pm
@@ -749,6 +749,7 @@ __PACKAGE__->register_method({
'efi-state-lost',
'guest-is-running',
'nvme-unsupported',
+ 'ova-needs-extracting',
'ovmf-with-lsi-unsupported',
'serial-port-socket-only',
],
diff --git a/src/PVE/Storage.pm b/src/PVE/Storage.pm
index f8ea93d..bc073ef 100755
--- a/src/PVE/Storage.pm
+++ b/src/PVE/Storage.pm
@@ -2189,4 +2189,63 @@ sub get_import_metadata {
return $plugin->get_import_metadata($scfg, $volname, $storeid);
}
+sub copy_needs_extraction {
+ my ($volid) = @_;
+ my ($storeid, $volname) = parse_volume_id($volid);
+ my $cfg = config();
+ my $scfg = storage_config($cfg, $storeid);
+ my $plugin = PVE::Storage::Plugin->lookup($scfg->{type});
+
+ my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $file_format) =
+ $plugin->parse_volname($volname);
+
+ return $vtype eq 'import' && defined($file_format);
+}
not sure this one is needed? it could also just be a call to
PVE::Storage::parse_volname in qemu-server?
+
+sub extract_disk_from_import_file {
similarly, this is basically PVE::Storage::get_import_dir + the
run_command call, and could live in qemu-server?
+ my ($volid, $vmid) = @_;
+
+ my ($storeid, $volname) = parse_volume_id($volid);
+ my $cfg = config();
+ my $scfg = storage_config($cfg, $storeid);
+ my $plugin = PVE::Storage::Plugin->lookup($scfg->{type});
+
+ my ($vtype, $name, undef, undef, undef, undef, $file_format) =
+ $plugin->parse_volname($volname);
+
+ die "only files with content type 'import' can be extracted\n"
+ if $vtype ne 'import' || !defined($file_format);
+
+ # extract the inner file from the name
+ if ($volid =~ m!${name}/([^/]+)$!) {
+ $name = $1;
we should probably be very conservative here and only allow [-_a-z0-9]
as a start - or something similar rather restrictive..
+ }
+
+ my ($source_file) = $plugin->path($scfg, $volname, $storeid);
+
+ my $destdir = $plugin->get_subdir($scfg, 'import');
+ my $pid = $$;
+ $destdir .= "/.tmp_${pid}_${vmid}";
+ mkdir $destdir;
+
+ ($source_file) = $source_file =~ m|^(/.*)|; # untaint
again a rather interesting untaint ;)
+
+ run_command(['tar', '-x', '-C', $destdir, '-f', $source_file, $name]);
if $name was a symlink in the archive, you've now created a symlink
pointing wherever..
+
+ return "$destdir/$name";
and this returns an absolute path to it, and now we are in trouble land
;) we should check that the file is a real file here..
+}
+
+sub cleanup_extracted_image {
same for this?
+ my ($source) = @_;
+
+ if ($source =~ m|^(/.+/\.tmp_[0-9]+_[0-9]+)/[^/]+$|) {
+ my $tmpdir = $1;
+
+ unlink $source or $! == ENOENT or die "removing image $source failed:
$!\n";
+ rmdir $tmpdir or $! == ENOENT or die "removing tmpdir $tmpdir failed:
$!\n";
+ } else {
+ die "invalid extraced image path '$source'\n";
nit: typo
these are also not discoverable if the error handling in qemu-server
failed for some reason.. might be a source of unwanted space
consumption..
+ }
+}
+
1;
diff --git a/src/PVE/Storage/DirPlugin.pm b/src/PVE/Storage/DirPlugin.pm
index 4dc7708..50ceab7 100644
--- a/src/PVE/Storage/DirPlugin.pm
+++ b/src/PVE/Storage/DirPlugin.pm
@@ -260,14 +260,25 @@ sub get_import_metadata {
# NOTE: all types must be added to the return schema of the
import-metadata API endpoint
my $warnings = [];
+ my $isOva = 0;
+ if ($path =~ m!\.ova!) {
+ $isOva = 1;
+ push @$warnings, { type => 'ova-needs-extracting' };
+ }
my $res = PVE::Storage::OVF::parse_ovf($path, $isOva);
my $disks = {};
for my $disk ($res->{disks}->@*) {
my $id = $disk->{disk_address};
my $size = $disk->{virtual_size};
my $path = $disk->{relative_path};
+ my $volid;
+ if ($isOva) {
+ $volid = "$storeid:$volname/$path";
+ } else {
+ $volid = "$storeid:import/$path",
+ }
$disks->{$id} = {
- volid => "$storeid:import/$path",
+ volid => $volid,
defined($size) ? (size => $size) : (),
};
}
diff --git a/src/PVE/Storage/OVF.pm b/src/PVE/Storage/OVF.pm
index 4a322b9..fb850a8 100644
--- a/src/PVE/Storage/OVF.pm
+++ b/src/PVE/Storage/OVF.pm
@@ -85,11 +85,37 @@ sub id_to_pve {
}
}
+# technically defined in DSP0004 (https://www.dmtf.org/dsp/DSP0004) as an ABNF
+# but realistically this always takes the form of 'bytes * base^exponent'
+sub try_parse_capacity_unit {
+ my ($unit_text) = @_;
+
+ if ($unit_text =~ m/^\s*byte\s*\*\s*([0-9]+)\s*\^\s*([0-9]+)\s*$/) {
+ my $base = $1;
+ my $exp = $2;
+ return $base ** $exp;
+ }
+
+ return undef;
+}
+
# returns two references, $qm which holds qm.conf style key/values, and
\@disks
sub parse_ovf {
- my ($ovf, $debug) = @_;
+ my ($ovf, $isOva, $debug) = @_;
+
+ # we have to ignore missing disk images for ova
+ my $dom;
+ if ($isOva) {
+ my $raw = "";
+ PVE::Tools::run_command(['tar', '-xO', '--wildcards', '--occurrence=1',
'-f', $ovf, '*.ovf'], outfunc => sub {
+ my $line = shift;
+ $raw .= $line;
+ });
+ $dom = XML::LibXML->load_xml(string => $raw, no_blanks => 1);
+ } else {
+ $dom = XML::LibXML->load_xml(location => $ovf, no_blanks => 1);
+ }
- my $dom = XML::LibXML->load_xml(location => $ovf, no_blanks => 1);
# register the xml namespaces in a xpath context object
# 'ovf' is the default namespace so it will prepended to each xml element
@@ -177,7 +203,17 @@ sub parse_ovf {
# @ needs to be escaped to prevent Perl double quote interpolation
my $xpath_find_fileref = sprintf("/ovf:Envelope/ovf:DiskSection/\
ovf:Disk[\@ovf:diskId='%s']/\@ovf:fileRef", $disk_id);
+ my $xpath_find_capacity = sprintf("/ovf:Envelope/ovf:DiskSection/\
+ovf:Disk[\@ovf:diskId='%s']/\@ovf:capacity", $disk_id);
+ my $xpath_find_capacity_unit = sprintf("/ovf:Envelope/ovf:DiskSection/\
+ovf:Disk[\@ovf:diskId='%s']/\@ovf:capacityAllocationUnits", $disk_id);
my $fileref = $xpc->findvalue($xpath_find_fileref);
+ my $capacity = $xpc->findvalue($xpath_find_capacity);
+ my $capacity_unit = $xpc->findvalue($xpath_find_capacity_unit);
+ my $virtual_size;
+ if (my $factor = try_parse_capacity_unit($capacity_unit)) {
+ $virtual_size = $capacity * $factor;
+ }
my $valid_url_chars = qr@${valid_uripath_chars}|/@;
if (!$fileref || $fileref !~ m/^${valid_url_chars}+$/) {
@@ -217,23 +253,26 @@ ovf:Item[rasd:InstanceID='%s']/rasd:ResourceType",
$controller_id);
die "error parsing $filepath, are you using a symlink ?\n";
}
- if (!-e $backing_file_path) {
+ if (!-e $backing_file_path && !$isOva) {
this is actually not enough, the realpath call above can already fail if
$filepath points to a file in a subdir (note that realpath will only
check the path components, not the file itself).
e.g.:
error parsing foo/bar/chr-6.49.13-disk1.vmdk, are you using a symlink ? (500)
we could also tighten what we allow as filepath here, in addition to the
extraction code.
die "error parsing $filepath, file seems not to exist at
$backing_file_path\n";
}
($backing_file_path) = $backing_file_path =~ m|^(/.*)|; # untaint
($filepath) = $filepath =~ m|^(.*)|; # untaint
- my $virtual_size = PVE::Storage::file_size_info($backing_file_path);
- die "error parsing $backing_file_path, cannot determine file size\n"
- if !$virtual_size;
+ if (!$isOva) {
+ my $size = PVE::Storage::file_size_info($backing_file_path);
+ die "error parsing $backing_file_path, cannot determine file size\n"
+ if !$size;
+ $virtual_size = $size;
+ }
$pve_disk = {
disk_address => $pve_disk_address,
backing_file => $backing_file_path,
- virtual_size => $virtual_size
relative_path => $filepath,
};
+ $pve_disk->{virtual_size} = $virtual_size if defined($virtual_size);
push @disks, $pve_disk;
}
diff --git a/src/PVE/Storage/Plugin.pm b/src/PVE/Storage/Plugin.pm
index deaf8b2..ea069ab 100644
--- a/src/PVE/Storage/Plugin.pm
+++ b/src/PVE/Storage/Plugin.pm
@@ -654,6 +654,11 @@ sub parse_volname {
return ('backup', $fn);
} elsif ($volname =~ m!^snippets/([^/]+)$!) {
return ('snippets', $1);
+ } elsif ($volname =~ m!^import/([^/]+\.ova)\/([^/]+)$!) {
+ my $archive = $1;
+ my $file = $2;
+ my (undef, $format, undef) = parse_name_dir($file);
+ return ('import', $archive, 0, undef, undef, undef, $format);
} elsif ($volname =~ m!^import/([^/]+$PVE::Storage::IMPORT_EXT_RE_1)$!) {
return ('import', $1);
} elsif ($volname =~ m!^import/([^/]+\.(raw|vmdk|qcow2))$!) {
--
2.39.2
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