Andrew's git / gitweb.git /
7961a27a2ed4f32c766dabdf12c4115c3d3b36ba
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org>
   5 * Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net>
   6 * Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu>
   7 * Copyright (C) 2006 Mike McCormack
   8 * Copyright (C) 2006 Christian Couder
   9 *
  10 *  This program is free software; you can redistribute it and/or modify
  11 *  it under the terms of the GNU General Public License as published by
  12 *  the Free Software Foundation; either version 2 of the License, or
  13 *  (at your option) any later version.
  14 *
  15 *  This program is distributed in the hope that it will be useful,
  16 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 *  GNU General Public License for more details.
  19 *
  20 *  You should have received a copy of the GNU General Public License
  21 *  along with this program; if not, write to the Free Software
  22 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23 */
  24
  25#include "cache.h"
  26#include "quote.h"
  27
  28/* Stolen from "imap-send.c". */
  29int nfvasprintf(char **strp, const char *fmt, va_list ap)
  30{
  31        int len;
  32        char tmp[1024];
  33
  34        if ((len = vsnprintf(tmp, sizeof(tmp), fmt, ap)) < 0 ||
  35            !(*strp = xmalloc(len + 1)))
  36                die("Fatal: Out of memory\n");
  37        if (len >= (int)sizeof(tmp))
  38                vsprintf(*strp, fmt, ap);
  39        else
  40                memcpy(*strp, tmp, len + 1);
  41        return len;
  42}
  43
  44int nfasprintf(char **str, const char *fmt, ...)
  45{
  46        int rc;
  47        va_list args;
  48
  49        va_start(args, fmt);
  50        rc = nfvasprintf(str, fmt, args);
  51        va_end(args);
  52        return rc;
  53}
  54
  55/* Get a trace file descriptor from GIT_TRACE env variable. */
  56static int get_trace_fd(int *need_close)
  57{
  58        char *trace = getenv("GIT_TRACE");
  59
  60        if (!trace || !strcmp(trace, "") ||
  61            !strcmp(trace, "0") || !strcasecmp(trace, "false"))
  62                return 0;
  63        if (!strcmp(trace, "1") || !strcasecmp(trace, "true"))
  64                return STDERR_FILENO;
  65        if (strlen(trace) == 1 && isdigit(*trace))
  66                return atoi(trace);
  67        if (*trace == '/') {
  68                int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
  69                if (fd == -1) {
  70                        fprintf(stderr,
  71                                "Could not open '%s' for tracing: %s\n"
  72                                "Defaulting to tracing on stderr...\n",
  73                                trace, strerror(errno));
  74                        return STDERR_FILENO;
  75                }
  76                *need_close = 1;
  77                return fd;
  78        }
  79
  80        fprintf(stderr, "What does '%s' for GIT_TRACE means ?\n", trace);
  81        fprintf(stderr, "If you want to trace into a file, "
  82                "then please set GIT_TRACE to an absolute pathname "
  83                "(starting with /).\n");
  84        fprintf(stderr, "Defaulting to tracing on stderr...\n");
  85
  86        return STDERR_FILENO;
  87}
  88
  89static const char err_msg[] = "Could not trace into fd given by "
  90        "GIT_TRACE environment variable";
  91
  92void trace_printf(const char *format, ...)
  93{
  94        char *trace_str;
  95        va_list rest;
  96        int need_close = 0;
  97        int fd = get_trace_fd(&need_close);
  98
  99        if (!fd)
 100                return;
 101
 102        va_start(rest, format);
 103        nfvasprintf(&trace_str, format, rest);
 104        va_end(rest);
 105
 106        write_or_whine_pipe(fd, trace_str, strlen(trace_str), err_msg);
 107
 108        free(trace_str);
 109
 110        if (need_close)
 111                close(fd);
 112}
 113
 114void trace_argv_printf(const char **argv, int count, const char *format, ...)
 115{
 116        char *argv_str, *format_str, *trace_str;
 117        size_t argv_len, format_len, trace_len;
 118        va_list rest;
 119        int need_close = 0;
 120        int fd = get_trace_fd(&need_close);
 121
 122        if (!fd)
 123                return;
 124
 125        /* Get the argv string. */
 126        argv_str = sq_quote_argv(argv, count);
 127        argv_len = strlen(argv_str);
 128
 129        /* Get the formated string. */
 130        va_start(rest, format);
 131        nfvasprintf(&format_str, format, rest);
 132        va_end(rest);
 133
 134        /* Allocate buffer for trace string. */
 135        format_len = strlen(format_str);
 136        trace_len = argv_len + format_len + 1; /* + 1 for \n */
 137        trace_str = xmalloc(trace_len + 1);
 138
 139        /* Copy everything into the trace string. */
 140        strncpy(trace_str, format_str, format_len);
 141        strncpy(trace_str + format_len, argv_str, argv_len);
 142        strcpy(trace_str + trace_len - 1, "\n");
 143
 144        write_or_whine_pipe(fd, trace_str, trace_len, err_msg);
 145
 146        free(argv_str);
 147        free(format_str);
 148        free(trace_str);
 149
 150        if (need_close)
 151                close(fd);
 152}