trace: add trace_strbuf
[git/git.git] / trace.c
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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
06796607
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28/* Get a trace file descriptor from "key" env variable. */
29static int get_trace_fd(const char *key, int *need_close)
6ce4e61f 30{
06796607 31 char *trace = getenv(key);
6ce4e61f 32
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33 if (!trace || !strcmp(trace, "") ||
34 !strcmp(trace, "0") || !strcasecmp(trace, "false"))
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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);
ecf4831d 40 if (is_absolute_path(trace)) {
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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
06796607 53 fprintf(stderr, "What does '%s' for %s mean?\n", trace, key);
6ce4e61f 54 fprintf(stderr, "If you want to trace into a file, "
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55 "then please set %s to an absolute pathname "
56 "(starting with /).\n", key);
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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
06796607 65void trace_vprintf(const char *key, const char *fmt, va_list ap)
6ce4e61f 66{
ebeb6090 67 struct strbuf buf = STRBUF_INIT;
6ce4e61f 68
94b3b374 69 if (!trace_want(key))
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70 return;
71
00b0d7f7 72 set_try_to_free_routine(NULL); /* is never reset */
ebeb6090 73 strbuf_vaddf(&buf, fmt, ap);
94b3b374 74 trace_strbuf(key, &buf);
7a33bcbe 75 strbuf_release(&buf);
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76}
77
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78void trace_printf_key(const char *key, const char *fmt, ...)
79{
80 va_list ap;
81 va_start(ap, fmt);
82 trace_vprintf(key, fmt, ap);
83 va_end(ap);
84}
85
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86void trace_printf(const char *fmt, ...)
87{
88 va_list ap;
89 va_start(ap, fmt);
06796607 90 trace_vprintf("GIT_TRACE", fmt, ap);
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91 va_end(ap);
92}
93
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94void trace_strbuf(const char *key, const struct strbuf *buf)
95{
96 int fd, need_close = 0;
97
98 fd = get_trace_fd(key, &need_close);
99 if (!fd)
100 return;
101
102 write_or_whine_pipe(fd, buf->buf, buf->len, err_msg);
103
104 if (need_close)
105 close(fd);
106}
107
b319ce4c 108void trace_argv_printf(const char **argv, const char *fmt, ...)
6ce4e61f 109{
ebeb6090 110 struct strbuf buf = STRBUF_INIT;
19247e55 111 va_list ap;
ebeb6090 112 int fd, need_close = 0;
6ce4e61f 113
06796607 114 fd = get_trace_fd("GIT_TRACE", &need_close);
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115 if (!fd)
116 return;
117
00b0d7f7 118 set_try_to_free_routine(NULL); /* is never reset */
19247e55 119 va_start(ap, fmt);
ebeb6090 120 strbuf_vaddf(&buf, fmt, ap);
19247e55 121 va_end(ap);
6ce4e61f 122
b319ce4c 123 sq_quote_argv(&buf, argv, 0);
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124 strbuf_addch(&buf, '\n');
125 write_or_whine_pipe(fd, buf.buf, buf.len, err_msg);
126 strbuf_release(&buf);
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127
128 if (need_close)
129 close(fd);
130}
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131
132static const char *quote_crnl(const char *path)
133{
134 static char new_path[PATH_MAX];
135 const char *p2 = path;
136 char *p1 = new_path;
137
138 if (!path)
139 return NULL;
140
141 while (*p2) {
142 switch (*p2) {
143 case '\\': *p1++ = '\\'; *p1++ = '\\'; break;
144 case '\n': *p1++ = '\\'; *p1++ = 'n'; break;
145 case '\r': *p1++ = '\\'; *p1++ = 'r'; break;
146 default:
147 *p1++ = *p2;
148 }
149 p2++;
150 }
151 *p1 = '\0';
152 return new_path;
153}
154
155/* FIXME: move prefix to startup_info struct and get rid of this arg */
156void trace_repo_setup(const char *prefix)
157{
e83c267f 158 const char *git_work_tree;
a9ca8a85 159 char cwd[PATH_MAX];
a9ca8a85 160
39bc5e46 161 if (!trace_want("GIT_TRACE"))
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162 return;
163
164 if (!getcwd(cwd, PATH_MAX))
165 die("Unable to get current working directory");
166
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167 if (!(git_work_tree = get_git_work_tree()))
168 git_work_tree = "(null)";
169
170 if (!prefix)
171 prefix = "(null)";
172
a9ca8a85 173 trace_printf("setup: git_dir: %s\n", quote_crnl(get_git_dir()));
e83c267f 174 trace_printf("setup: worktree: %s\n", quote_crnl(git_work_tree));
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175 trace_printf("setup: cwd: %s\n", quote_crnl(cwd));
176 trace_printf("setup: prefix: %s\n", quote_crnl(prefix));
177}
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178
179int trace_want(const char *key)
180{
181 const char *trace = getenv(key);
182
183 if (!trace || !strcmp(trace, "") ||
184 !strcmp(trace, "0") || !strcasecmp(trace, "false"))
185 return 0;
186 return 1;
187}