snapshot: support tar signature for compressed tar

This adds support for kernel.org style signatures where the uncompressed
tar archive is signed and compressed later. The signature is valid for
all tar* snapshots.

We have a filter which snapshots may be generated and downloaded. This has
to allow tar signatures now even if tar itself is not allowed. To simplify
things we allow all signatures.

Signed-off-by: Christian Hesse <mail@eworm.de>

1 files changed, 2 insertions, 1 deletions

@@ -86,6 +86,7 @@ static int write_tar_xz_archive(const char *hex, const char *prefix)
 }
 
 const struct cgit_snapshot_format cgit_snapshot_formats[] = {
+        /* .tar must remain the 0 index */
         { ".tar",       "application/x-tar",    write_tar_archive       },
         { ".tar.gz",    "application/x-gzip",   write_tar_gzip_archive  },
         { ".tar.bz2",   "application/x-bzip2",  write_tar_bzip2_archive },
@@ -268,7 +269,7 @@ void cgit_print_snapshot(const char *head, const char *hex,
         }
 
         f = get_format(filename);
-        if (!f || !(ctx.repo->snapshots & cgit_snapshot_format_bit(f))) {
+        if (!f || (!sig_filename && !(ctx.repo->snapshots & cgit_snapshot_format_bit(f)))) {
                 cgit_print_error_page(400, "Bad request",
                                 "Unsupported snapshot format: %s", filename);
                 return;