dgit: ftpmaster api fetch: Check http error code (!)

We are going to want to handle 404 specially so do not just use -f.

Handle file:/// specially since curl just always invents 000 for the
http error code in that case.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

1 files changed, 9 insertions, 0 deletions

diff --git a/dgit b/dgit
index 19a0835..ae07145 100755
--- a/dgit
+++ b/dgit
@@ -989,7 +989,16 @@ sub api_query ($$) {
     badcfg "ftpmasterapi archive query method takes no data part"
 	if length $data;
     my @cmd = archive_api_query_cmd($subpath);
+    my $url = $cmd[$#cmd];
+    push @cmd, qw(-w %{http_code});
     my $json = cmdoutput @cmd;
+    unless ($json =~ s/\d+\d+\d$//) {
+	failedcmd_report_cmd undef, @cmd;
+	fail "curl failed to print 3-digit HTTP code";
+    }
+    my $code = $&;
+    fail "fetch of $url gave HTTP code $code"
+	unless $url =~ m#^file://# or $code =~ m/^2/;
     return decode_json($json);
 }