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Subject: [pve-devel] [PATCH pve-storage 3/9] common: add qemu_img_info helper
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From: Alexandre Derumier <alexandre.derumier@groupe-cyllene.com>
To: pve-devel@lists.proxmox.com
Subject: [PATCH pve-storage 3/9] common: add qemu_img_info helper
Date: Tue, 3 Jun 2025 09:55:42 +0200
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---
src/PVE/Storage/Common.pm | 35 +++++++++++++++++++++++++++++++++++
src/PVE/Storage/Plugin.pm | 19 +------------------
2 files changed, 36 insertions(+), 18 deletions(-)
diff --git a/src/PVE/Storage/Common.pm b/src/PVE/Storage/Common.pm
index 8910988..25f5d28 100644
--- a/src/PVE/Storage/Common.pm
+++ b/src/PVE/Storage/Common.pm
@@ -206,4 +206,39 @@ sub qemu_img_create_qcow2_backed {
run_command($cmd, errmsg => "unable to create image");
}
+=pod
+
+=head3 qemu_img_info
+
+ qemu_img_info($filename, $file_format, $timeout)
+
+Returns a json with qemu image C<$filename> informations with format <$file_format>.
+
+=cut
+
+sub qemu_img_info {
+ my ($filename, $file_format, $timeout) = @_;
+
+ my $cmd = ['/usr/bin/qemu-img', 'info', '--output=json', $filename];
+ push $cmd->@*, '-f', $file_format if $file_format;
+
+ my $json = '';
+ my $err_output = '';
+ eval {
+ run_command($cmd,
+ timeout => $timeout,
+ outfunc => sub { $json .= shift },
+ errfunc => sub { $err_output .= shift . "\n"},
+ );
+ };
+ warn $@ if $@;
+ if ($err_output) {
+ # if qemu did not output anything to stdout we die with stderr as an error
+ die $err_output if !$json;
+ # otherwise we warn about it and try to parse the json
+ warn $err_output;
+ }
+ return $json;
+}
+
1;
diff --git a/src/PVE/Storage/Plugin.pm b/src/PVE/Storage/Plugin.pm
index 8bf4ed3..dee10e6 100644
--- a/src/PVE/Storage/Plugin.pm
+++ b/src/PVE/Storage/Plugin.pm
@@ -995,25 +995,8 @@ sub file_size_info {
warn "file_size_info: '$filename': falling back to 'raw' from unknown format '$file_format'\n";
$file_format = 'raw';
}
- my $cmd = ['/usr/bin/qemu-img', 'info', '--output=json', $filename];
- push $cmd->@*, '-f', $file_format if $file_format;
- my $json = '';
- my $err_output = '';
- eval {
- run_command($cmd,
- timeout => $timeout,
- outfunc => sub { $json .= shift },
- errfunc => sub { $err_output .= shift . "\n"},
- );
- };
- warn $@ if $@;
- if ($err_output) {
- # if qemu did not output anything to stdout we die with stderr as an error
- die $err_output if !$json;
- # otherwise we warn about it and try to parse the json
- warn $err_output;
- }
+ my $json = PVE::Storage::Common::qemu_img_info($filename, $file_format, $timeout);
if (!$json) {
die "failed to query file information with qemu-img\n" if $untrusted;
# skip decoding if there was no output, e.g. if there was a timeout.
--
2.39.5
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