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![Johannes Sixt](/assets/img/avatar_default.png)
This removes the last parameter of recv_sideband, by which the callers told which channel bands #2 and #3 should be written to. Sayeth Shawn Pearce: The definition of the streams in the current sideband protocol are rather well defined for the one protocol that uses it, fetch-pack/receive-pack: stream #1: pack data stream #2: stderr messages, progress, meant for tty stream #3: abort message, remote is dead, goodbye! Since both callers of the function passed 2 for the parameter, we hereby remove it and send bands #2 and #3 to stderr explicitly using fprintf. This has the nice side-effect that these two streams pass through our ANSI emulation layer on Windows. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Acked-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
147 lines
3.3 KiB
C
147 lines
3.3 KiB
C
#include "pkt-line.h"
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#include "sideband.h"
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/*
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* Receive multiplexed output stream over git native protocol.
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* in_stream is the input stream from the remote, which carries data
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* in pkt_line format with band designator. Demultiplex it into out
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* and err and return error appropriately. Band #1 carries the
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* primary payload. Things coming over band #2 is not necessarily
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* error; they are usually informative message on the standard error
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* stream, aka "verbose"). A message over band #3 is a signal that
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* the remote died unexpectedly. A flush() concludes the stream.
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*/
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#define PREFIX "remote:"
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#define ANSI_SUFFIX "\033[K"
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#define DUMB_SUFFIX " "
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#define FIX_SIZE 10 /* large enough for any of the above */
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int recv_sideband(const char *me, int in_stream, int out)
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{
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unsigned pf = strlen(PREFIX);
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unsigned sf;
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char buf[LARGE_PACKET_MAX + 2*FIX_SIZE];
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char *suffix, *term;
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int skip_pf = 0;
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memcpy(buf, PREFIX, pf);
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term = getenv("TERM");
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if (term && strcmp(term, "dumb"))
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suffix = ANSI_SUFFIX;
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else
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suffix = DUMB_SUFFIX;
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sf = strlen(suffix);
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while (1) {
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int band, len;
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len = packet_read_line(in_stream, buf + pf, LARGE_PACKET_MAX);
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if (len == 0)
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break;
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if (len < 1) {
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fprintf(stderr, "%s: protocol error: no band designator\n", me);
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return SIDEBAND_PROTOCOL_ERROR;
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}
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band = buf[pf] & 0xff;
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len--;
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switch (band) {
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case 3:
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buf[pf] = ' ';
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buf[pf+1+len] = '\0';
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fprintf(stderr, "%s\n", buf);
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return SIDEBAND_REMOTE_ERROR;
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case 2:
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buf[pf] = ' ';
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do {
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char *b = buf;
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int brk = 0;
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/*
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* If the last buffer didn't end with a line
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* break then we should not print a prefix
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* this time around.
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*/
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if (skip_pf) {
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b += pf+1;
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} else {
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len += pf+1;
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brk += pf+1;
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}
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/* Look for a line break. */
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for (;;) {
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brk++;
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if (brk > len) {
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brk = 0;
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break;
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}
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if (b[brk-1] == '\n' ||
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b[brk-1] == '\r')
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break;
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}
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/*
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* Let's insert a suffix to clear the end
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* of the screen line if a line break was
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* found. Also, if we don't skip the
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* prefix, then a non-empty string must be
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* present too.
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*/
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if (brk > (skip_pf ? 0 : (pf+1 + 1))) {
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char save[FIX_SIZE];
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memcpy(save, b + brk, sf);
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b[brk + sf - 1] = b[brk - 1];
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memcpy(b + brk - 1, suffix, sf);
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fprintf(stderr, "%.*s", brk + sf, b);
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memcpy(b + brk, save, sf);
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len -= brk;
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} else {
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int l = brk ? brk : len;
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fprintf(stderr, "%.*s", l, b);
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len -= l;
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}
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skip_pf = !brk;
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memmove(buf + pf+1, b + brk, len);
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} while (len);
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continue;
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case 1:
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safe_write(out, buf + pf+1, len);
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continue;
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default:
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fprintf(stderr, "%s: protocol error: bad band #%d\n",
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me, band);
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return SIDEBAND_PROTOCOL_ERROR;
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}
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}
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return 0;
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}
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/*
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* fd is connected to the remote side; send the sideband data
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* over multiplexed packet stream.
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*/
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ssize_t send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max)
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{
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ssize_t ssz = sz;
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const char *p = data;
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while (sz) {
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unsigned n;
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char hdr[5];
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n = sz;
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if (packet_max - 5 < n)
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n = packet_max - 5;
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sprintf(hdr, "%04x", n + 5);
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hdr[4] = band;
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safe_write(fd, hdr, 5);
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safe_write(fd, p, n);
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p += n;
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sz -= n;
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}
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return ssz;
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}
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