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From: Lorenz Stechauner <l.stechauner@proxmox.com>
To: pve-devel@lists.proxmox.com
Date: Thu, 6 May 2021 11:11:00 +0200
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information. [tools.pm]
Subject: [pve-devel] [PATCH v4 common 2/7] tools: add download_file_from_url
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code is based on
manager:PVE/API2/Nodes.pm:aplinfo
Signed-off-by: Lorenz Stechauner <l.stechauner@proxmox.com>
---
src/PVE/Tools.pm | 123 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 123 insertions(+)
diff --git a/src/PVE/Tools.pm b/src/PVE/Tools.pm
index 16ae3d2..c751426 100644
--- a/src/PVE/Tools.pm
+++ b/src/PVE/Tools.pm
@@ -1829,4 +1829,127 @@ sub safe_compare {
return $cmp->($left, $right);
}
+
+# opts
+# -> hash_required
+# -> http_proxy
+# -> verify_certificates
+# -> sha(1|224|256|384|512)sum
+# -> md5sum
+sub download_file_from_url {
+ my ($dest, $url, $opts) = @_;
+
+ my $tmpdest = "$dest.tmp.$$";
+
+ my $worker = sub {
+ my $upid = shift;
+
+ print "donwloading $url to $dest\n";
+
+ eval {
+ if (-f $dest) {
+ print "calculating checksum of existing file...\n";
+ my ($correct, $hash, $expected) = check_file_hash($opts, $dest, 1);
+
+ if ($hash && $correct) {
+ print "file already exists - no need to download\n";
+ return;
+ } else {
+ print "mismatch, downloading\n";
+ }
+ }
+
+ my @cmd = ('/usr/bin/wget', '--progress=dot:mega', '-O', $tmpdest, $url);
+
+ local %ENV;
+ if ($opts->{http_proxy}) {
+ $ENV{http_proxy} = $opts->{http_proxy};
+ }
+
+ if (defined($opts->{verify_certificates}) && $opts->{verify_certificates} == 0) {
+ push @cmd, '--no-check-certificate';
+ }
+
+ if (system(@cmd) != 0) {
+ die "download failed - $!\n";
+ }
+
+ print "trying to calculate checksum...\n";
+
+ my ($correct, $hash, $expected) = check_file_hash($opts, $tmpdest, !$opts->{hash_required});
+
+ die "could not calculate checksum\n" if ($opts->{hash_required} && !$hash);
+
+ if ($hash) {
+ if ($correct) {
+ print "checksum verified\n";
+ } else {
+ die "wrong checksum: $hash != $expected\n";
+ }
+ } else {
+ print "no checksum for verification specified\n";
+ }
+
+ if (!rename($tmpdest, $dest)) {
+ die "unable to save file - $!\n";
+ }
+ };
+ my $err = $@;
+
+ unlink $tmpdest;
+
+ if ($err) {
+ print "\n";
+ die $err;
+ }
+
+ print "download finished\n";
+ };
+
+ my $rpcenv = PVE::RPCEnvironment::get();
+ my $user = $rpcenv->get_user();
+
+ (my $filename = $dest) =~ s!.*/([^/]*)$!\1!;
+
+ return $rpcenv->fork_worker('download', $filename, $user, $worker);
+}
+
+sub check_file_hash {
+ my ($checksums, $filename, $noerr) = @_;
+
+ my $digest;
+ my $expected;
+
+ eval {
+ open(my $fh, '<', $filename) or die "Can't open '$filename': $!";
+ binmode($fh);
+ if (defined($checksums->{sha512sum})) {
+ $expected = $checksums->{sha512sum};
+ $digest = Digest::SHA->new(512)->addfile($fh)->hexdigest;
+ } elsif (defined($checksums->{sha384sum})) {
+ $expected = $checksums->{sha384sum};
+ $digest = Digest::SHA->new(384)->addfile($fh)->hexdigest;
+ } elsif (defined($checksums->{sha256sum})) {
+ $expected = $checksums->{sha256sum};
+ $digest = Digest::SHA->new(256)->addfile($fh)->hexdigest;
+ } elsif (defined($checksums->{sha224sum})) {
+ $expected = $checksums->{sha224sum};
+ $digest = Digest::SHA->new(224)->addfile($fh)->hexdigest;
+ } elsif (defined($checksums->{sha1sum})) {
+ $expected = $checksums->{sha1sum};
+ $digest = Digest::SHA->new(1)->addfile($fh)->hexdigest;
+ } elsif (defined($checksums->{md5sum})) {
+ $expected = $checksums->{md5sum};
+ $digest = Digest::MD5->new->addfile($fh)->hexdigest;
+ } else {
+ die "no expected checksum defined";
+ }
+ close($fh);
+ };
+
+ die "checking hash failed - $@\n" if $@ && !$noerr;
+
+ return (($digest ? lc($digest) eq lc($expected) : 0), $digest, $expected);
+}
+
1;
--
2.20.1