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 (is_absolute_path(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 mean?\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 struct strbuf buf; 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 strbuf_init(&buf, 64); 76 va_start(ap, fmt); 77 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); 78 va_end(ap); 79 if (len >= strbuf_avail(&buf)) { 80 strbuf_grow(&buf, len - strbuf_avail(&buf) + 128); 81 va_start(ap, fmt); 82 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); 83 va_end(ap); 84 if (len >= strbuf_avail(&buf)) 85 die("broken vsnprintf"); 86 } 87 strbuf_setlen(&buf, len); 88 89 write_or_whine_pipe(fd, buf.buf, buf.len, err_msg); 90 strbuf_release(&buf); 91 92 if (need_close) 93 close(fd); 94} 95 96void trace_argv_printf(const char **argv, const char *fmt, ...) 97{ 98 struct strbuf buf; 99 va_list ap; 100 int fd, len, need_close = 0; 101 102 fd = get_trace_fd(&need_close); 103 if (!fd) 104 return; 105 106 strbuf_init(&buf, 64); 107 va_start(ap, fmt); 108 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); 109 va_end(ap); 110 if (len >= strbuf_avail(&buf)) { 111 strbuf_grow(&buf, len - strbuf_avail(&buf) + 128); 112 va_start(ap, fmt); 113 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); 114 va_end(ap); 115 if (len >= strbuf_avail(&buf)) 116 die("broken vsnprintf"); 117 } 118 strbuf_setlen(&buf, len); 119 120 sq_quote_argv(&buf, argv, 0); 121 strbuf_addch(&buf, '\n'); 122 write_or_whine_pipe(fd, buf.buf, buf.len, err_msg); 123 strbuf_release(&buf); 124 125 if (need_close) 126 close(fd); 127}