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 intget_trace_fd(int*need_close) 30{ 31char*trace =getenv("GIT_TRACE"); 32 33if(!trace || !strcmp(trace,"") || 34!strcmp(trace,"0") || !strcasecmp(trace,"false")) 35return0; 36if(!strcmp(trace,"1") || !strcasecmp(trace,"true")) 37return STDERR_FILENO; 38if(strlen(trace) ==1&&isdigit(*trace)) 39returnatoi(trace); 40if(*trace =='/') { 41int fd =open(trace, O_WRONLY | O_APPEND | O_CREAT,0666); 42if(fd == -1) { 43fprintf(stderr, 44"Could not open '%s' for tracing:%s\n" 45"Defaulting to tracing on stderr...\n", 46 trace,strerror(errno)); 47return STDERR_FILENO; 48} 49*need_close =1; 50return fd; 51} 52 53fprintf(stderr,"What does '%s' for GIT_TRACE means ?\n", trace); 54fprintf(stderr,"If you want to trace into a file, " 55"then please set GIT_TRACE to an absolute pathname " 56"(starting with /).\n"); 57fprintf(stderr,"Defaulting to tracing on stderr...\n"); 58 59return STDERR_FILENO; 60} 61 62static const char err_msg[] ="Could not trace into fd given by " 63"GIT_TRACE environment variable"; 64 65voidtrace_printf(const char*fmt, ...) 66{ 67char buf[8192]; 68va_list ap; 69int fd, len, need_close =0; 70 71 fd =get_trace_fd(&need_close); 72if(!fd) 73return; 74 75va_start(ap, fmt); 76 len =vsnprintf(buf,sizeof(buf), fmt, ap); 77va_end(ap); 78if(len >=sizeof(buf)) 79die("unreasonnable trace length"); 80write_or_whine_pipe(fd, buf, len, err_msg); 81 82if(need_close) 83close(fd); 84} 85 86voidtrace_argv_printf(const char**argv,int count,const char*fmt, ...) 87{ 88char buf[8192]; 89va_list ap; 90char*argv_str; 91size_t argv_len; 92int fd, len, need_close =0; 93 94 fd =get_trace_fd(&need_close); 95if(!fd) 96return; 97 98va_start(ap, fmt); 99 len =vsnprintf(buf,sizeof(buf), fmt, ap); 100va_end(ap); 101if(len >=sizeof(buf)) 102die("unreasonnable trace length"); 103 104/* Get the argv string. */ 105 argv_str =sq_quote_argv(argv, count); 106 argv_len =strlen(argv_str); 107 108write_or_whine_pipe(fd, buf, len, err_msg); 109write_or_whine_pipe(fd, argv_str, argv_len, err_msg); 110write_or_whine_pipe(fd,"\n",1, err_msg); 111 112free(argv_str); 113 114if(need_close) 115close(fd); 116}