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Allow eval to see the tty if its output is not piped

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Commit 5fccfd83ec, with the fix for #6806,
switched eval to buffer its output (like other builtins do). But this
prevents using eval with commands that wants to see the tty, especially
fzf. So only buffer the output if the output is piped to the next process.

This will solve #6955 (which needs to go into a point release).
This commit is contained in:
ridiculousfish 2020-04-28 09:55:58 -07:00
parent 607779257c
commit 80e92581aa
1 changed files with 40 additions and 20 deletions
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50
src/builtin_eval.cpp
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@ -27,22 +27,39 @@ int builtin_eval(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
new_cmd += argv[i];
}
// The output and errput of eval must go to our streams, not to the io_chain in our streams,
// because they may contain a pipe which is intended to be consumed by a process which is not
// yet launched (#6806). Make bufferfills to capture it.
// TODO: we are sloppy and do not honor other redirections; eval'd code won't see for example a
// redirection of fd 3.
shared_ptr<io_bufferfill_t> stdout_fill =
// If stdout is piped, then its output must go to the streams, not to the io_chain in our
// streams, because the pipe may be intended to be consumed by a process which
// is not yet launched (#6806). If stdout is NOT redirected, it must see the tty (#6955). So
// create a bufferfill for stdout if and only if stdout is piped.
// Note do not do this if stdout is merely redirected (say, to a file); we don't want to
// buffer in that case.
shared_ptr<io_bufferfill_t> stdout_fill{};
if (streams.out_is_piped) {
stdout_fill =
io_bufferfill_t::create(fd_set_t{}, parser.libdata().read_limit, STDOUT_FILENO);
shared_ptr<io_bufferfill_t> stderr_fill =
io_bufferfill_t::create(fd_set_t{}, parser.libdata().read_limit, STDERR_FILENO);
if (!stdout_fill || !stderr_fill) {
// This can happen if we are unable to create a pipe.
if (!stdout_fill) {
// We were unable to create a pipe, probably fd exhaustion.
return STATUS_CMD_ERROR;
}
}
// Of course the same applies to stderr.
shared_ptr<io_bufferfill_t> stderr_fill{};
if (streams.err_is_piped) {
stderr_fill =
io_bufferfill_t::create(fd_set_t{}, parser.libdata().read_limit, STDERR_FILENO);
if (!stderr_fill) {
return STATUS_CMD_ERROR;
}
}
// Construct the full io chain, perhaps with our bufferfills appended.
io_chain_t ios = *streams.io_chain;
if (stdout_fill) ios.push_back(stdout_fill);
if (stderr_fill) ios.push_back(stderr_fill);
int status = STATUS_CMD_OK;
auto res = parser.eval(new_cmd, io_chain_t{stdout_fill, stderr_fill}, streams.parent_pgid);
auto res = parser.eval(new_cmd, ios, streams.parent_pgid);
if (res.was_empty) {
// Issue #5692, in particular, to catch `eval ""`, `eval "begin; end;"`, etc.
// where we have an argument but nothing is executed.
@ -52,14 +69,17 @@ int builtin_eval(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
}
// Finish the bufferfills - exhaust and close our pipes.
// Copy the output from the bufferfill back to the streams.
// Note it is important that we hold no other references to the bufferfills here - they need to
// deallocate to close.
ios.clear();
if (stdout_fill) {
std::shared_ptr<io_buffer_t> output = io_bufferfill_t::finish(std::move(stdout_fill));
std::shared_ptr<io_buffer_t> errput = io_bufferfill_t::finish(std::move(stderr_fill));
// Copy the output from the bufferfill back to the streams.
streams.out.append_narrow_buffer(output->buffer());
}
if (stderr_fill) {
std::shared_ptr<io_buffer_t> errput = io_bufferfill_t::finish(std::move(stderr_fill));
streams.err.append_narrow_buffer(errput->buffer());
}
return status;
}