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Commit | Line | Data |
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cdf4fb8e | 1 | #include "cache.h" |
49a52b1d JH |
2 | #include "pkt-line.h" |
3 | #include "sideband.h" | |
4 | ||
5 | /* | |
6 | * Receive multiplexed output stream over git native protocol. | |
7 | * in_stream is the input stream from the remote, which carries data | |
8 | * in pkt_line format with band designator. Demultiplex it into out | |
9 | * and err and return error appropriately. Band #1 carries the | |
10 | * primary payload. Things coming over band #2 is not necessarily | |
11 | * error; they are usually informative message on the standard error | |
12 | * stream, aka "verbose"). A message over band #3 is a signal that | |
13 | * the remote died unexpectedly. A flush() concludes the stream. | |
14 | */ | |
ebe8fa73 | 15 | |
5e5be9e2 | 16 | #define PREFIX "remote: " |
13e4760a JS |
17 | |
18 | #define ANSI_SUFFIX "\033[K" | |
19 | #define DUMB_SUFFIX " " | |
20 | ||
34df8aba | 21 | int recv_sideband(const char *me, int in_stream, int out) |
49a52b1d | 22 | { |
5e5be9e2 LF |
23 | const char *term, *suffix; |
24 | char buf[LARGE_PACKET_MAX + 1]; | |
25 | struct strbuf outbuf = STRBUF_INIT; | |
26 | int retval = 0; | |
13e4760a | 27 | |
13e4760a | 28 | term = getenv("TERM"); |
38de156a | 29 | if (isatty(2) && term && strcmp(term, "dumb")) |
13e4760a JS |
30 | suffix = ANSI_SUFFIX; |
31 | else | |
32 | suffix = DUMB_SUFFIX; | |
13e4760a | 33 | |
5e5be9e2 LF |
34 | while (!retval) { |
35 | const char *b, *brk; | |
9ac13ec9 | 36 | int band, len; |
5e5be9e2 | 37 | len = packet_read(in_stream, NULL, NULL, buf, LARGE_PACKET_MAX, 0); |
49a52b1d JH |
38 | if (len == 0) |
39 | break; | |
40 | if (len < 1) { | |
5e5be9e2 LF |
41 | strbuf_addf(&outbuf, |
42 | "%s%s: protocol error: no band designator", | |
43 | outbuf.len ? "\n" : "", me); | |
44 | retval = SIDEBAND_PROTOCOL_ERROR; | |
45 | break; | |
49a52b1d | 46 | } |
5e5be9e2 LF |
47 | band = buf[0] & 0xff; |
48 | buf[len] = '\0'; | |
49a52b1d | 49 | len--; |
9ac13ec9 | 50 | switch (band) { |
49a52b1d | 51 | case 3: |
5e5be9e2 LF |
52 | strbuf_addf(&outbuf, "%s%s%s", outbuf.len ? "\n" : "", |
53 | PREFIX, buf + 1); | |
54 | retval = SIDEBAND_REMOTE_ERROR; | |
55 | break; | |
49a52b1d | 56 | case 2: |
5e5be9e2 | 57 | b = buf + 1; |
ebe8fa73 | 58 | |
5e5be9e2 LF |
59 | /* |
60 | * Append a suffix to each nonempty line to clear the | |
61 | * end of the screen line. | |
62 | * | |
63 | * The output is accumulated in a buffer and | |
64 | * each line is printed to stderr using | |
65 | * write(2) to ensure inter-process atomicity. | |
66 | */ | |
67 | while ((brk = strpbrk(b, "\n\r"))) { | |
68 | int linelen = brk - b; | |
ebe8fa73 | 69 | |
5e5be9e2 | 70 | if (!outbuf.len) |
c61b2af7 | 71 | strbuf_addstr(&outbuf, PREFIX); |
5e5be9e2 LF |
72 | if (linelen > 0) { |
73 | strbuf_addf(&outbuf, "%.*s%s%c", | |
74 | linelen, b, suffix, *brk); | |
6b9c42b4 | 75 | } else { |
c61b2af7 | 76 | strbuf_addch(&outbuf, *brk); |
6b9c42b4 | 77 | } |
5e5be9e2 LF |
78 | xwrite(2, outbuf.buf, outbuf.len); |
79 | strbuf_reset(&outbuf); | |
ebe8fa73 | 80 | |
5e5be9e2 LF |
81 | b = brk + 1; |
82 | } | |
83 | ||
84 | if (*b) | |
85 | strbuf_addf(&outbuf, "%s%s", | |
86 | outbuf.len ? "" : PREFIX, b); | |
87 | break; | |
49a52b1d | 88 | case 1: |
5e5be9e2 LF |
89 | write_or_die(out, buf + 1, len); |
90 | break; | |
49a52b1d | 91 | default: |
5e5be9e2 LF |
92 | strbuf_addf(&outbuf, "%s%s: protocol error: bad band #%d", |
93 | outbuf.len ? "\n" : "", me, band); | |
94 | retval = SIDEBAND_PROTOCOL_ERROR; | |
95 | break; | |
49a52b1d JH |
96 | } |
97 | } | |
5e5be9e2 LF |
98 | |
99 | if (outbuf.len) { | |
c61b2af7 | 100 | strbuf_addch(&outbuf, '\n'); |
5e5be9e2 LF |
101 | xwrite(2, outbuf.buf, outbuf.len); |
102 | } | |
103 | strbuf_release(&outbuf); | |
104 | return retval; | |
49a52b1d | 105 | } |
958c24b1 JH |
106 | |
107 | /* | |
108 | * fd is connected to the remote side; send the sideband data | |
109 | * over multiplexed packet stream. | |
110 | */ | |
4c4b7d1d | 111 | void send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max) |
958c24b1 | 112 | { |
958c24b1 JH |
113 | const char *p = data; |
114 | ||
115 | while (sz) { | |
116 | unsigned n; | |
117 | char hdr[5]; | |
118 | ||
119 | n = sz; | |
120 | if (packet_max - 5 < n) | |
121 | n = packet_max - 5; | |
de1a2fdd | 122 | if (0 <= band) { |
5096d490 | 123 | xsnprintf(hdr, sizeof(hdr), "%04x", n + 5); |
de1a2fdd | 124 | hdr[4] = band; |
cdf4fb8e | 125 | write_or_die(fd, hdr, 5); |
de1a2fdd | 126 | } else { |
5096d490 | 127 | xsnprintf(hdr, sizeof(hdr), "%04x", n + 4); |
cdf4fb8e | 128 | write_or_die(fd, hdr, 4); |
de1a2fdd | 129 | } |
cdf4fb8e | 130 | write_or_die(fd, p, n); |
958c24b1 JH |
131 | p += n; |
132 | sz -= n; | |
133 | } | |
958c24b1 | 134 | } |