completion: add missing configuration variables
[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
8e8aa440 28static void do_nothing(size_t unused)
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29{
30}
31
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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
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37 if (!trace || !strcmp(trace, "") ||
38 !strcmp(trace, "0") || !strcasecmp(trace, "false"))
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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);
ecf4831d 44 if (is_absolute_path(trace)) {
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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
a8fdab08 57 fprintf(stderr, "What does '%s' for GIT_TRACE mean?\n", trace);
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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
19247e55 69void trace_printf(const char *fmt, ...)
6ce4e61f 70{
7a33bcbe 71 struct strbuf buf;
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72 va_list ap;
73 int fd, len, need_close = 0;
6ce4e61f 74
19247e55 75 fd = get_trace_fd(&need_close);
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76 if (!fd)
77 return;
78
3a094259 79 set_try_to_free_routine(do_nothing); /* is never reset */
f141bd80 80 strbuf_init(&buf, 64);
19247e55 81 va_start(ap, fmt);
7a33bcbe 82 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
19247e55 83 va_end(ap);
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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);
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96
97 if (need_close)
98 close(fd);
99}
100
b319ce4c 101void trace_argv_printf(const char **argv, const char *fmt, ...)
6ce4e61f 102{
7a33bcbe 103 struct strbuf buf;
19247e55 104 va_list ap;
19247e55 105 int fd, len, need_close = 0;
6ce4e61f 106
19247e55 107 fd = get_trace_fd(&need_close);
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108 if (!fd)
109 return;
110
3a094259 111 set_try_to_free_routine(do_nothing); /* is never reset */
f141bd80 112 strbuf_init(&buf, 64);
19247e55 113 va_start(ap, fmt);
7a33bcbe 114 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
19247e55 115 va_end(ap);
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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);
6ce4e61f 125
b319ce4c 126 sq_quote_argv(&buf, argv, 0);
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127 strbuf_addch(&buf, '\n');
128 write_or_whine_pipe(fd, buf.buf, buf.len, err_msg);
129 strbuf_release(&buf);
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130
131 if (need_close)
132 close(fd);
133}