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6ce4e61f CC |
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 | ||
6ce4e61f CC |
28 | /* Get a trace file descriptor from GIT_TRACE env variable. */ |
29 | static int get_trace_fd(int *need_close) | |
30 | { | |
31 | char *trace = getenv("GIT_TRACE"); | |
32 | ||
6844fc80 CC |
33 | if (!trace || !strcmp(trace, "") || |
34 | !strcmp(trace, "0") || !strcasecmp(trace, "false")) | |
6ce4e61f CC |
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)) { |
6ce4e61f CC |
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); |
6ce4e61f CC |
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 | ||
62 | static const char err_msg[] = "Could not trace into fd given by " | |
63 | "GIT_TRACE environment variable"; | |
64 | ||
19247e55 | 65 | void trace_printf(const char *fmt, ...) |
6ce4e61f | 66 | { |
7a33bcbe | 67 | struct strbuf buf; |
19247e55 PH |
68 | va_list ap; |
69 | int fd, len, need_close = 0; | |
6ce4e61f | 70 | |
19247e55 | 71 | fd = get_trace_fd(&need_close); |
6ce4e61f CC |
72 | if (!fd) |
73 | return; | |
74 | ||
f141bd80 | 75 | strbuf_init(&buf, 64); |
19247e55 | 76 | va_start(ap, fmt); |
7a33bcbe | 77 | len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); |
19247e55 | 78 | va_end(ap); |
7a33bcbe PH |
79 | if (len >= strbuf_avail(&buf)) { |
80 | strbuf_grow(&buf, len - strbuf_avail(&buf) + 128); | |
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 | die("broken vsnprintf"); | |
86 | } | |
87 | strbuf_setlen(&buf, len); | |
88 | ||
89 | write_or_whine_pipe(fd, buf.buf, buf.len, err_msg); | |
90 | strbuf_release(&buf); | |
6ce4e61f CC |
91 | |
92 | if (need_close) | |
93 | close(fd); | |
94 | } | |
95 | ||
b319ce4c | 96 | void trace_argv_printf(const char **argv, const char *fmt, ...) |
6ce4e61f | 97 | { |
7a33bcbe | 98 | struct strbuf buf; |
19247e55 | 99 | va_list ap; |
19247e55 | 100 | int fd, len, need_close = 0; |
6ce4e61f | 101 | |
19247e55 | 102 | fd = get_trace_fd(&need_close); |
6ce4e61f CC |
103 | if (!fd) |
104 | return; | |
105 | ||
f141bd80 | 106 | strbuf_init(&buf, 64); |
19247e55 | 107 | va_start(ap, fmt); |
7a33bcbe | 108 | len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); |
19247e55 | 109 | va_end(ap); |
7a33bcbe PH |
110 | if (len >= strbuf_avail(&buf)) { |
111 | strbuf_grow(&buf, len - strbuf_avail(&buf) + 128); | |
112 | va_start(ap, fmt); | |
113 | len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); | |
114 | va_end(ap); | |
115 | if (len >= strbuf_avail(&buf)) | |
116 | die("broken vsnprintf"); | |
117 | } | |
118 | strbuf_setlen(&buf, len); | |
6ce4e61f | 119 | |
b319ce4c | 120 | sq_quote_argv(&buf, argv, 0); |
7a33bcbe PH |
121 | strbuf_addch(&buf, '\n'); |
122 | write_or_whine_pipe(fd, buf.buf, buf.len, err_msg); | |
123 | strbuf_release(&buf); | |
6ce4e61f CC |
124 | |
125 | if (need_close) | |
126 | close(fd); | |
127 | } |