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/* Get a trace file descriptor from GIT_TRACE env variable. */ 29static int get_trace_fd(int *need_close) 30{ 31 char *trace = getenv("GIT_TRACE"); 32 33 if (!trace || !strcmp(trace, "") || 34 !strcmp(trace, "0") || !strcasecmp(trace, "false")) 35 return 0; 36 if (!strcmp(trace, "1") || !strcasecmp(trace, "true")) 37 return STDERR_FILENO; 38 if (strlen(trace) == 1 && isdigit(*trace)) 39 return atoi(trace); 40 if (*trace == '/') { 41 int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666); 42 if (fd == -1) { 43 fprintf(stderr, 44 "Could not open '%s' for tracing: %s\n" 45 "Defaulting to tracing on stderr...\n", 46 trace, strerror(errno)); 47 return STDERR_FILENO; 48 } 49 *need_close = 1; 50 return fd; 51 } 52 53 fprintf(stderr, "What does '%s' for GIT_TRACE means ?\n", trace); 54 fprintf(stderr, "If you want to trace into a file, " 55 "then please set GIT_TRACE to an absolute pathname " 56 "(starting with /).\n"); 57 fprintf(stderr, "Defaulting to tracing on stderr...\n"); 58 59 return STDERR_FILENO; 60} 61 62static const char err_msg[] = "Could not trace into fd given by " 63 "GIT_TRACE environment variable"; 64 65void trace_printf(const char *fmt, ...) 66{ 67 char buf[8192]; 68 va_list ap; 69 int fd, len, need_close = 0; 70 71 fd = get_trace_fd(&need_close); 72 if (!fd) 73 return; 74 75 va_start(ap, fmt); 76 len = vsnprintf(buf, sizeof(buf), fmt, ap); 77 va_end(ap); 78 if (len >= sizeof(buf)) 79 die("unreasonnable trace length"); 80 write_or_whine_pipe(fd, buf, len, err_msg); 81 82 if (need_close) 83 close(fd); 84} 85 86void trace_argv_printf(const char **argv, int count, const char *fmt, ...) 87{ 88 char buf[8192]; 89 va_list ap; 90 char *argv_str; 91 size_t argv_len; 92 int fd, len, need_close = 0; 93 94 fd = get_trace_fd(&need_close); 95 if (!fd) 96 return; 97 98 va_start(ap, fmt); 99 len = vsnprintf(buf, sizeof(buf), fmt, ap); 100 va_end(ap); 101 if (len >= sizeof(buf)) 102 die("unreasonnable trace length"); 103 104 /* Get the argv string. */ 105 argv_str = sq_quote_argv(argv, count); 106 argv_len = strlen(argv_str); 107 108 write_or_whine_pipe(fd, buf, len, err_msg); 109 write_or_whine_pipe(fd, argv_str, argv_len, err_msg); 110 write_or_whine_pipe(fd, "\n", 1, err_msg); 111 112 free(argv_str); 113 114 if (need_close) 115 close(fd); 116}