sideband.c

   1 #include "cache.h"
   2 #include "color.h"
   3 #include "config.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "help.h"
   7
   8 struct keyword_entry {
   9         /*
  10          * We use keyword as config key so it should be a single alphanumeric word.
  11          */
  12         const char *keyword;
  13         char color[COLOR_MAXLEN];
  14 };
  15
  16 static struct keyword_entry keywords[] = {
  17         { "hint",       GIT_COLOR_YELLOW },
  18         { "warning",    GIT_COLOR_BOLD_YELLOW },
  19         { "success",    GIT_COLOR_BOLD_GREEN },
  20         { "error",      GIT_COLOR_BOLD_RED },
  21 };
  22
  23 /* Returns a color setting (GIT_COLOR_NEVER, etc). */
  24 static int use_sideband_colors(void)
  25 {
  26         static int use_sideband_colors_cached = -1;
  27
  28         const char *key = "color.remote";
  29         struct strbuf sb = STRBUF_INIT;
  30         char *value;
  31         int i;
  32
  33         if (use_sideband_colors_cached >= 0)
  34                 return use_sideband_colors_cached;
  35
  36         if (!git_config_get_string(key, &value)) {
  37                 use_sideband_colors_cached = git_config_colorbool(key, value);
  38         } else if (!git_config_get_string("color.ui", &value)) {
  39                 use_sideband_colors_cached = git_config_colorbool("color.ui", value);
  40         } else {
  41                 use_sideband_colors_cached = GIT_COLOR_AUTO;
  42         }
  43
  44         for (i = 0; i < ARRAY_SIZE(keywords); i++) {
  45                 strbuf_reset(&sb);
  46                 strbuf_addf(&sb, "%s.%s", key, keywords[i].keyword);
  47                 if (git_config_get_string(sb.buf, &value))
  48                         continue;
  49                 if (color_parse(value, keywords[i].color))
  50                         continue;
  51         }
  52         strbuf_release(&sb);
  53         return use_sideband_colors_cached;
  54 }
  55
  56 void list_config_color_sideband_slots(struct string_list *list, const char *prefix)
  57 {
  58         int i;
  59
  60         for (i = 0; i < ARRAY_SIZE(keywords); i++)
  61                 list_config_item(list, prefix, keywords[i].keyword);
  62 }
  63
  64 /*
  65  * Optionally highlight one keyword in remote output if it appears at the start
  66  * of the line. This should be called for a single line only, which is
  67  * passed as the first N characters of the SRC array.
  68  *
  69  * NEEDSWORK: use "size_t n" instead for clarity.
  70  */
  71 static void maybe_colorize_sideband(struct strbuf *dest, const char *src, int n)
  72 {
  73         int i;
  74
  75         if (!want_color_stderr(use_sideband_colors())) {
  76                 strbuf_add(dest, src, n);
  77                 return;
  78         }
  79
  80         while (0 < n && isspace(*src)) {
  81                 strbuf_addch(dest, *src);
  82                 src++;
  83                 n--;
  84         }
  85
  86         for (i = 0; i < ARRAY_SIZE(keywords); i++) {
  87                 struct keyword_entry *p = keywords + i;
  88                 int len = strlen(p->keyword);
  89
  90                 if (n < len)
  91                         continue;
  92                 /*
  93                  * Match case insensitively, so we colorize output from existing
  94                  * servers regardless of the case that they use for their
  95                  * messages. We only highlight the word precisely, so
  96                  * "successful" stays uncolored.
  97                  */
  98                 if (!strncasecmp(p->keyword, src, len) &&
  99                     (len == n || !isalnum(src[len]))) {
 100                         strbuf_addstr(dest, p->color);
 101                         strbuf_add(dest, src, len);
 102                         strbuf_addstr(dest, GIT_COLOR_RESET);
 103                         n -= len;
 104                         src += len;
 105                         break;
 106                 }
 107         }
 108
 109         strbuf_add(dest, src, n);
 110 }
 111
 112
 113 /*
 114  * Receive multiplexed output stream over git native protocol.
 115  * in_stream is the input stream from the remote, which carries data
 116  * in pkt_line format with band designator.  Demultiplex it into out
 117  * and err and return error appropriately.  Band #1 carries the
 118  * primary payload.  Things coming over band #2 is not necessarily
 119  * error; they are usually informative message on the standard error
 120  * stream, aka "verbose").  A message over band #3 is a signal that
 121  * the remote died unexpectedly.  A flush() concludes the stream.
 122  */
 123
 124 #define DISPLAY_PREFIX "remote: "
 125
 126 #define ANSI_SUFFIX "\033[K"
 127 #define DUMB_SUFFIX "        "
 128
 129 int recv_sideband(const char *me, int in_stream, int out)
 130 {
 131         const char *suffix;
 132         char buf[LARGE_PACKET_MAX + 1];
 133         struct strbuf outbuf = STRBUF_INIT;
 134         int retval = 0;
 135
 136         if (isatty(2) && !is_terminal_dumb())
 137                 suffix = ANSI_SUFFIX;
 138         else
 139                 suffix = DUMB_SUFFIX;
 140
 141         while (!retval) {
 142                 const char *b, *brk;
 143                 int band, len;
 144                 len = packet_read(in_stream, NULL, NULL, buf, LARGE_PACKET_MAX, 0);
 145                 if (len == 0)
 146                         break;
 147                 if (len < 1) {
 148                         strbuf_addf(&outbuf,
 149                                     "%s%s: protocol error: no band designator",
 150                                     outbuf.len ? "\n" : "", me);
 151                         retval = SIDEBAND_PROTOCOL_ERROR;
 152                         break;
 153                 }
 154                 band = buf[0] & 0xff;
 155                 buf[len] = '\0';
 156                 len--;
 157                 switch (band) {
 158                 case 3:
 159                         strbuf_addf(&outbuf, "%s%s", outbuf.len ? "\n" : "",
 160                                     DISPLAY_PREFIX);
 161                         maybe_colorize_sideband(&outbuf, buf + 1, len);
 162
 163                         retval = SIDEBAND_REMOTE_ERROR;
 164                         break;
 165                 case 2:
 166                         b = buf + 1;
 167
 168                         /*
 169                          * Append a suffix to each nonempty line to clear the
 170                          * end of the screen line.
 171                          *
 172                          * The output is accumulated in a buffer and
 173                          * each line is printed to stderr using
 174                          * write(2) to ensure inter-process atomicity.
 175                          */
 176                         while ((brk = strpbrk(b, "\n\r"))) {
 177                                 int linelen = brk - b;
 178
 179                                 if (!outbuf.len)
 180                                         strbuf_addstr(&outbuf, DISPLAY_PREFIX);
 181                                 if (linelen > 0) {
 182                                         maybe_colorize_sideband(&outbuf, b, linelen);
 183                                         strbuf_addstr(&outbuf, suffix);
 184                                 }
 185
 186                                 strbuf_addch(&outbuf, *brk);
 187                                 xwrite(2, outbuf.buf, outbuf.len);
 188                                 strbuf_reset(&outbuf);
 189
 190                                 b = brk + 1;
 191                         }
 192
 193                         if (*b) {
 194                                 strbuf_addstr(&outbuf, outbuf.len ?
 195                                             "" : DISPLAY_PREFIX);
 196                                 maybe_colorize_sideband(&outbuf, b, strlen(b));
 197                         }
 198                         break;
 199                 case 1:
 200                         write_or_die(out, buf + 1, len);
 201                         break;
 202                 default:
 203                         strbuf_addf(&outbuf, "%s%s: protocol error: bad band #%d",
 204                                     outbuf.len ? "\n" : "", me, band);
 205                         retval = SIDEBAND_PROTOCOL_ERROR;
 206                         break;
 207                 }
 208         }
 209
 210         if (outbuf.len) {
 211                 strbuf_addch(&outbuf, '\n');
 212                 xwrite(2, outbuf.buf, outbuf.len);
 213         }
 214         strbuf_release(&outbuf);
 215         return retval;
 216 }
 217
 218 /*
 219  * fd is connected to the remote side; send the sideband data
 220  * over multiplexed packet stream.
 221  */
 222 void send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max)
 223 {
 224         const char *p = data;
 225
 226         while (sz) {
 227                 unsigned n;
 228                 char hdr[5];
 229
 230                 n = sz;
 231                 if (packet_max - 5 < n)
 232                         n = packet_max - 5;
 233                 if (0 <= band) {
 234                         xsnprintf(hdr, sizeof(hdr), "%04x", n + 5);
 235                         hdr[4] = band;
 236                         write_or_die(fd, hdr, 5);
 237                 } else {
 238                         xsnprintf(hdr, sizeof(hdr), "%04x", n + 4);
 239                         write_or_die(fd, hdr, 4);
 240                 }
 241                 write_or_die(fd, p, n);
 242                 p += n;
 243                 sz -= n;
 244         }
 245 }