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pkt-line: do not report packet write errors twice 

On write() errors, packet_write() dies with the same error message that
is already printed by its callee, packet_write_gently(). This produces
an unnecessarily verbose and repetitive output:

error: packet write failed
fatal: packet write failed: <strerror() message>

In addition to that, packet_write_gently() does not always fulfill its
caller expectation that errno will be properly set before a non-zero
return. In particular, that is not the case for a "data exceeds max
packet size" error. So, in this case, packet_write() will call
die_errno() and print an strerror(errno) message that might be totally
unrelated to the actual error.

Fix both those issues by turning packet_write() and
packet_write_gently() into wrappers to a common lower level function
that doesn't print the error message, but instead returns it on a buffer
for the caller to die() or error() as appropriate.

Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Matheus Tavares 2021-04-15 18:57:52 -03:00 committed by Junio C Hamano
parent 54a3917115
commit 332ec963bc
1 changed files with 24 additions and 7 deletions
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31
pkt-line.c
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@ -194,13 +194,16 @@ int packet_write_fmt_gently(int fd, const char *fmt, ...)
return status;
}
static int packet_write_gently(const int fd_out, const char *buf, size_t size)
static int do_packet_write(const int fd_out, const char *buf, size_t size,
struct strbuf *err)
{
char header[4];
size_t packet_size;
if (size > LARGE_PACKET_DATA_MAX)
return error(_("packet write failed - data exceeds max packet size"));
if (size > LARGE_PACKET_DATA_MAX) {
strbuf_addstr(err, _("packet write failed - data exceeds max packet size"));
return -1;
}
packet_trace(buf, size, 1);
packet_size = size + 4;
@ -215,15 +218,29 @@ static int packet_write_gently(const int fd_out, const char *buf, size_t size)
*/
if (write_in_full(fd_out, header, 4) < 0 ||
write_in_full(fd_out, buf, size) < 0)
return error(_("packet write failed"));
write_in_full(fd_out, buf, size) < 0) {
strbuf_addf(err, _("packet write failed: %s"), strerror(errno));
return -1;
}
return 0;
}
static int packet_write_gently(const int fd_out, const char *buf, size_t size)
{
struct strbuf err = STRBUF_INIT;
if (do_packet_write(fd_out, buf, size, &err)) {
error("%s", err.buf);
strbuf_release(&err);
return -1;
}
return 0;
}
void packet_write(int fd_out, const char *buf, size_t size)
{
if (packet_write_gently(fd_out, buf, size))
die_errno(_("packet write failed"));
struct strbuf err = STRBUF_INIT;
if (do_packet_write(fd_out, buf, size, &err))
die("%s", err.buf);
}
void packet_buf_write(struct strbuf *buf, const char *fmt, ...)