[pve-devel] [PATCH storage v5 4/7] storage: introduce decompress_archive_into_pipe helper

[Filip Schauer]

Extract the file decompression code into its own reusable subroutine.

Signed-off-by: Filip Schauer <f.schauer at proxmox.com>
---
 src/PVE/Storage.pm | 64 +++++++++++++++++++++++++++++-----------------
 1 file changed, 40 insertions(+), 24 deletions(-)

diff --git a/src/PVE/Storage.pm b/src/PVE/Storage.pm
index ae190cd..5d25a2a 100755
--- a/src/PVE/Storage.pm
+++ b/src/PVE/Storage.pm
@@ -1707,6 +1707,45 @@ sub extract_vzdump_config_tar {
     return wantarray ? ($raw, $file) : $raw;
 }
 
+sub decompress_archive_into_pipe {
+    my ($archive, $cmd, $outfunc) = @_;
+
+    my $info = archive_info($archive);
+    die "archive is not compressed\n" if !$info->{compression};
+    my $decompressor = $info->{decompressor};
+    my $full_cmd = [ [@$decompressor, $archive], $cmd ];
+
+    # lzop/zcat exits with 1 when the pipe is closed early,
+    # detect this and ignore the exit code later
+    my $broken_pipe;
+    my $errstring;
+    my $err = sub {
+	my $output = shift;
+	if (
+	    $output =~ m/lzop: Broken pipe: <stdout>/
+	    || $output =~ m/gzip: stdout: Broken pipe/
+	    || $output =~ m/zstd: error 70 : Write error.*Broken pipe/
+	) {
+	    $broken_pipe = 1;
+	} elsif (!defined ($errstring) && $output !~ m/^\s*$/) {
+	    $errstring = "failed to decompress archive: $output\n";
+	}
+    };
+
+    my $rc = eval { run_command($full_cmd, outfunc => $outfunc, errfunc => $err, noerr => 1) };
+    my $rerr = $@;
+
+    $broken_pipe ||= $rc == 141; # broken pipe from cmd POV
+
+    if (!$errstring && !$broken_pipe && $rc != 0) {
+	die "$rerr\n" if $rerr;
+	die "archive decompression failed with exit code $rc\n";
+    }
+    die "$errstring\n" if $errstring;
+
+    return;
+}
+
 sub extract_vzdump_config_vma {
     my ($archive, $comp) = @_;
 
@@ -1718,30 +1757,7 @@ sub extract_vzdump_config_vma {
     my $decompressor = $info->{decompressor};
 
     if ($comp) {
-	my $cmd = [ [@$decompressor, $archive], ["vma", "config", "-"] ];
-
-	# lzop/zcat exits with 1 when the pipe is closed early by vma, detect this and ignore the exit code later
-	my $broken_pipe;
-	my $errstring;
-	my $err = sub {
-	    my $output = shift;
-	    if ($output =~ m/lzop: Broken pipe: <stdout>/ || $output =~ m/gzip: stdout: Broken pipe/ || $output =~ m/zstd: error 70 : Write error.*Broken pipe/) {
-		$broken_pipe = 1;
-	    } elsif (!defined ($errstring) && $output !~ m/^\s*$/) {
-		$errstring = "Failed to extract config from VMA archive: $output\n";
-	    }
-	};
-
-	my $rc = eval { run_command($cmd, outfunc => $out, errfunc => $err, noerr => 1) };
-	my $rerr = $@;
-
-	$broken_pipe ||= $rc == 141; # broken pipe from vma POV
-
-	if (!$errstring && !$broken_pipe && $rc != 0) {
-	    die "$rerr\n" if $rerr;
-	    die "config extraction failed with exit code $rc\n";
-	}
-	die "$errstring\n" if $errstring;
+	decompress_archive_into_pipe($archive, ["vma", "config", "-"], $out);
     } else {
 	run_command(["vma", "config", $archive], outfunc => $out);
     }
-- 
2.39.5