| /* |
| * GIT - The information manager from hell |
| * |
| * Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org> |
| * Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net> |
| * Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu> |
| * Copyright (C) 2006 Mike McCormack |
| * Copyright (C) 2006 Christian Couder |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include "cache.h" |
| #include "quote.h" |
| |
| /* Get a trace file descriptor from GIT_TRACE env variable. */ |
| static int get_trace_fd(int *need_close) |
| { |
| char *trace = getenv("GIT_TRACE"); |
| |
| if (!trace || !strcmp(trace, "") || |
| !strcmp(trace, "0") || !strcasecmp(trace, "false")) |
| return 0; |
| if (!strcmp(trace, "1") || !strcasecmp(trace, "true")) |
| return STDERR_FILENO; |
| if (strlen(trace) == 1 && isdigit(*trace)) |
| return atoi(trace); |
| if (is_absolute_path(trace)) { |
| int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666); |
| if (fd == -1) { |
| fprintf(stderr, |
| "Could not open '%s' for tracing: %s\n" |
| "Defaulting to tracing on stderr...\n", |
| trace, strerror(errno)); |
| return STDERR_FILENO; |
| } |
| *need_close = 1; |
| return fd; |
| } |
| |
| fprintf(stderr, "What does '%s' for GIT_TRACE mean?\n", trace); |
| fprintf(stderr, "If you want to trace into a file, " |
| "then please set GIT_TRACE to an absolute pathname " |
| "(starting with /).\n"); |
| fprintf(stderr, "Defaulting to tracing on stderr...\n"); |
| |
| return STDERR_FILENO; |
| } |
| |
| static const char err_msg[] = "Could not trace into fd given by " |
| "GIT_TRACE environment variable"; |
| |
| void trace_printf(const char *fmt, ...) |
| { |
| struct strbuf buf; |
| va_list ap; |
| int fd, len, need_close = 0; |
| |
| fd = get_trace_fd(&need_close); |
| if (!fd) |
| return; |
| |
| strbuf_init(&buf, 64); |
| va_start(ap, fmt); |
| len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); |
| va_end(ap); |
| if (len >= strbuf_avail(&buf)) { |
| strbuf_grow(&buf, len - strbuf_avail(&buf) + 128); |
| va_start(ap, fmt); |
| len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); |
| va_end(ap); |
| if (len >= strbuf_avail(&buf)) |
| die("broken vsnprintf"); |
| } |
| strbuf_setlen(&buf, len); |
| |
| write_or_whine_pipe(fd, buf.buf, buf.len, err_msg); |
| strbuf_release(&buf); |
| |
| if (need_close) |
| close(fd); |
| } |
| |
| void trace_argv_printf(const char **argv, const char *fmt, ...) |
| { |
| struct strbuf buf; |
| va_list ap; |
| int fd, len, need_close = 0; |
| |
| fd = get_trace_fd(&need_close); |
| if (!fd) |
| return; |
| |
| strbuf_init(&buf, 64); |
| va_start(ap, fmt); |
| len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); |
| va_end(ap); |
| if (len >= strbuf_avail(&buf)) { |
| strbuf_grow(&buf, len - strbuf_avail(&buf) + 128); |
| va_start(ap, fmt); |
| len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); |
| va_end(ap); |
| if (len >= strbuf_avail(&buf)) |
| die("broken vsnprintf"); |
| } |
| strbuf_setlen(&buf, len); |
| |
| sq_quote_argv(&buf, argv, 0); |
| strbuf_addch(&buf, '\n'); |
| write_or_whine_pipe(fd, buf.buf, buf.len, err_msg); |
| strbuf_release(&buf); |
| |
| if (need_close) |
| close(fd); |
| } |