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 28void do_nothing(size_t unused) 29{ 30} 31 32/* Get a trace file descriptor from GIT_TRACE env variable. */ 33static int get_trace_fd(int *need_close) 34{ 35 char *trace = getenv("GIT_TRACE"); 36 37 if (!trace || !strcmp(trace, "") || 38 !strcmp(trace, "0") || !strcasecmp(trace, "false")) 39 return 0; 40 if (!strcmp(trace, "1") || !strcasecmp(trace, "true")) 41 return STDERR_FILENO; 42 if (strlen(trace) == 1 && isdigit(*trace)) 43 return atoi(trace); 44 if (is_absolute_path(trace)) { 45 int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666); 46 if (fd == -1) { 47 fprintf(stderr, 48 "Could not open '%s' for tracing: %s\n" 49 "Defaulting to tracing on stderr...\n", 50 trace, strerror(errno)); 51 return STDERR_FILENO; 52 } 53 *need_close = 1; 54 return fd; 55 } 56 57 fprintf(stderr, "What does '%s' for GIT_TRACE mean?\n", trace); 58 fprintf(stderr, "If you want to trace into a file, " 59 "then please set GIT_TRACE to an absolute pathname " 60 "(starting with /).\n"); 61 fprintf(stderr, "Defaulting to tracing on stderr...\n"); 62 63 return STDERR_FILENO; 64} 65 66static const char err_msg[] = "Could not trace into fd given by " 67 "GIT_TRACE environment variable"; 68 69void trace_printf(const char *fmt, ...) 70{ 71 struct strbuf buf; 72 va_list ap; 73 int fd, len, need_close = 0; 74 75 fd = get_trace_fd(&need_close); 76 if (!fd) 77 return; 78 79 set_try_to_free_routine(do_nothing); /* is never reset */ 80 strbuf_init(&buf, 64); 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 strbuf_grow(&buf, len - strbuf_avail(&buf) + 128); 86 va_start(ap, fmt); 87 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); 88 va_end(ap); 89 if (len >= strbuf_avail(&buf)) 90 die("broken vsnprintf"); 91 } 92 strbuf_setlen(&buf, len); 93 94 write_or_whine_pipe(fd, buf.buf, buf.len, err_msg); 95 strbuf_release(&buf); 96 97 if (need_close) 98 close(fd); 99} 100 101void trace_argv_printf(const char **argv, const char *fmt, ...) 102{ 103 struct strbuf buf; 104 va_list ap; 105 int fd, len, need_close = 0; 106 107 fd = get_trace_fd(&need_close); 108 if (!fd) 109 return; 110 111 set_try_to_free_routine(do_nothing); /* is never reset */ 112 strbuf_init(&buf, 64); 113 va_start(ap, fmt); 114 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); 115 va_end(ap); 116 if (len >= strbuf_avail(&buf)) { 117 strbuf_grow(&buf, len - strbuf_avail(&buf) + 128); 118 va_start(ap, fmt); 119 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); 120 va_end(ap); 121 if (len >= strbuf_avail(&buf)) 122 die("broken vsnprintf"); 123 } 124 strbuf_setlen(&buf, len); 125 126 sq_quote_argv(&buf, argv, 0); 127 strbuf_addch(&buf, '\n'); 128 write_or_whine_pipe(fd, buf.buf, buf.len, err_msg); 129 strbuf_release(&buf); 130 131 if (need_close) 132 close(fd); 133}