Git 1.7.4-rc1
[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
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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
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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
a8fdab08 53 fprintf(stderr, "What does '%s' for GIT_TRACE mean?\n", trace);
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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
19247e55 65void trace_printf(const char *fmt, ...)
6ce4e61f 66{
7a33bcbe 67 struct strbuf buf;
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68 va_list ap;
69 int fd, len, need_close = 0;
6ce4e61f 70
19247e55 71 fd = get_trace_fd(&need_close);
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72 if (!fd)
73 return;
74
00b0d7f7 75 set_try_to_free_routine(NULL); /* is never reset */
f141bd80 76 strbuf_init(&buf, 64);
19247e55 77 va_start(ap, fmt);
7a33bcbe 78 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
19247e55 79 va_end(ap);
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80 if (len >= strbuf_avail(&buf)) {
81 strbuf_grow(&buf, len - strbuf_avail(&buf) + 128);
82 va_start(ap, fmt);
83 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
84 va_end(ap);
85 if (len >= strbuf_avail(&buf))
86 die("broken vsnprintf");
87 }
88 strbuf_setlen(&buf, len);
89
90 write_or_whine_pipe(fd, buf.buf, buf.len, err_msg);
91 strbuf_release(&buf);
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92
93 if (need_close)
94 close(fd);
95}
96
b319ce4c 97void trace_argv_printf(const char **argv, const char *fmt, ...)
6ce4e61f 98{
7a33bcbe 99 struct strbuf buf;
19247e55 100 va_list ap;
19247e55 101 int fd, len, need_close = 0;
6ce4e61f 102
19247e55 103 fd = get_trace_fd(&need_close);
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104 if (!fd)
105 return;
106
00b0d7f7 107 set_try_to_free_routine(NULL); /* is never reset */
f141bd80 108 strbuf_init(&buf, 64);
19247e55 109 va_start(ap, fmt);
7a33bcbe 110 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
19247e55 111 va_end(ap);
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112 if (len >= strbuf_avail(&buf)) {
113 strbuf_grow(&buf, len - strbuf_avail(&buf) + 128);
114 va_start(ap, fmt);
115 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
116 va_end(ap);
117 if (len >= strbuf_avail(&buf))
118 die("broken vsnprintf");
119 }
120 strbuf_setlen(&buf, len);
6ce4e61f 121
b319ce4c 122 sq_quote_argv(&buf, argv, 0);
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123 strbuf_addch(&buf, '\n');
124 write_or_whine_pipe(fd, buf.buf, buf.len, err_msg);
125 strbuf_release(&buf);
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126
127 if (need_close)
128 close(fd);
129}
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130
131static const char *quote_crnl(const char *path)
132{
133 static char new_path[PATH_MAX];
134 const char *p2 = path;
135 char *p1 = new_path;
136
137 if (!path)
138 return NULL;
139
140 while (*p2) {
141 switch (*p2) {
142 case '\\': *p1++ = '\\'; *p1++ = '\\'; break;
143 case '\n': *p1++ = '\\'; *p1++ = 'n'; break;
144 case '\r': *p1++ = '\\'; *p1++ = 'r'; break;
145 default:
146 *p1++ = *p2;
147 }
148 p2++;
149 }
150 *p1 = '\0';
151 return new_path;
152}
153
154/* FIXME: move prefix to startup_info struct and get rid of this arg */
155void trace_repo_setup(const char *prefix)
156{
157 char cwd[PATH_MAX];
158 char *trace = getenv("GIT_TRACE");
159
160 if (!trace || !strcmp(trace, "") ||
161 !strcmp(trace, "0") || !strcasecmp(trace, "false"))
162 return;
163
164 if (!getcwd(cwd, PATH_MAX))
165 die("Unable to get current working directory");
166
167 trace_printf("setup: git_dir: %s\n", quote_crnl(get_git_dir()));
168 trace_printf("setup: worktree: %s\n", quote_crnl(get_git_work_tree()));
169 trace_printf("setup: cwd: %s\n", quote_crnl(cwd));
170 trace_printf("setup: prefix: %s\n", quote_crnl(prefix));
171}