On Wed, Jul 10, 2024 at 03:53:52PM +0200, Phil Sutter wrote: > Hi Pablo, > > On Tue, Jul 09, 2024 at 04:59:52PM +0200, Pablo Neira Ayuso wrote: > > Since 5c2b2b0a2ba7 ("src: error reporting with -f and read from stdin") > > stdin is stored in a buffer, update json support to use it instead of > > reading from /dev/stdin. > > > > Some systems do not provide /dev/stdin symlink to /proc/self/fd/0 > > according to reporter (that mentions Yocto Linux as example). > > > > Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> > > --- > > src/parser_json.c | 7 +++++++ > > 1 file changed, 7 insertions(+) > > > > diff --git a/src/parser_json.c b/src/parser_json.c > > index ee4657ee8044..4912d3608b2b 100644 > > --- a/src/parser_json.c > > +++ b/src/parser_json.c > > @@ -4357,6 +4357,13 @@ int nft_parse_json_filename(struct nft_ctx *nft, const char *filename, > > json_error_t err; > > int ret; > > > > + if (nft->stdin_buf) { > > + json_indesc.type = INDESC_STDIN; > > + json_indesc.name = "/dev/stdin"; > > + > > + return nft_parse_json_buffer(nft, nft->stdin_buf, msgs, cmds); > > + } > > Is this sufficient? In nft_run_cmd_from_filename(), nft->stdin_buf is > populated conditionally: > > | if (!strcmp(filename, "/dev/stdin") && > | !nft_output_json(&nft->output)) > | nft->stdin_buf = stdin_to_buffer(); > > Later (in the wrapped __nft_run_cmd_from_filename()), we try JSON parsing > conditionally: > > | if (nft_output_json(&nft->output) || nft_input_json(&nft->input)) > | rc = nft_parse_json_filename(nft, filename, &msgs, &cmds); > > Things got complicated by commit 2034d8c60ed91 ("src: add input flag > NFT_CTX_INPUT_JSON to enable JSON parsing") and my request to remain > compatible, i.e. '-j' flag which enables JSON output shall continue to > make JSON the assumed input format. > > So long story short, I guess in order to cover all cases, we have to > enable nft->stdin_buf population also if nft_input_json(...) returns > true, i.e. cover for library users requesting JSON input (but standard > output). WDYT? On second review, I think the right change is to make nft_run_cmd_from_filename() *always* populate nft->stdin_buf if 'filename' is '/dev/stdin', i.e. drop the !nft_output_json(...) clause. Sorry for the confusion. Cheers, Phil