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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 | ||
28 | /* Get a trace file descriptor from "key" env variable. */ | |
29 | static int get_trace_fd(const char *key, int *need_close) | |
30 | { | |
31 | char *trace = getenv(key); | |
32 | ||
33 | if (!trace || !strcmp(trace, "") || | |
34 | !strcmp(trace, "0") || !strcasecmp(trace, "false")) | |
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); | |
40 | if (is_absolute_path(trace)) { | |
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 | ||
53 | fprintf(stderr, "What does '%s' for %s mean?\n", trace, key); | |
54 | fprintf(stderr, "If you want to trace into a file, " | |
55 | "then please set %s to an absolute pathname " | |
56 | "(starting with /).\n", key); | |
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 | ||
65 | static void trace_vprintf(const char *key, const char *fmt, va_list ap) | |
66 | { | |
67 | struct strbuf buf = STRBUF_INIT; | |
68 | ||
69 | if (!trace_want(key)) | |
70 | return; | |
71 | ||
72 | set_try_to_free_routine(NULL); /* is never reset */ | |
73 | strbuf_vaddf(&buf, fmt, ap); | |
74 | trace_strbuf(key, &buf); | |
75 | strbuf_release(&buf); | |
76 | } | |
77 | ||
78 | static void 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 | ||
86 | void trace_printf(const char *fmt, ...) | |
87 | { | |
88 | va_list ap; | |
89 | va_start(ap, fmt); | |
90 | trace_vprintf("GIT_TRACE", fmt, ap); | |
91 | va_end(ap); | |
92 | } | |
93 | ||
94 | void 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 | ||
108 | void trace_argv_printf(const char **argv, const char *fmt, ...) | |
109 | { | |
110 | struct strbuf buf = STRBUF_INIT; | |
111 | va_list ap; | |
112 | int fd, need_close = 0; | |
113 | ||
114 | fd = get_trace_fd("GIT_TRACE", &need_close); | |
115 | if (!fd) | |
116 | return; | |
117 | ||
118 | set_try_to_free_routine(NULL); /* is never reset */ | |
119 | va_start(ap, fmt); | |
120 | strbuf_vaddf(&buf, fmt, ap); | |
121 | va_end(ap); | |
122 | ||
123 | sq_quote_argv(&buf, argv, 0); | |
124 | strbuf_addch(&buf, '\n'); | |
125 | write_or_whine_pipe(fd, buf.buf, buf.len, err_msg); | |
126 | strbuf_release(&buf); | |
127 | ||
128 | if (need_close) | |
129 | close(fd); | |
130 | } | |
131 | ||
132 | static 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 */ | |
156 | void trace_repo_setup(const char *prefix) | |
157 | { | |
158 | static const char *key = "GIT_TRACE_SETUP"; | |
159 | const char *git_work_tree; | |
160 | char cwd[PATH_MAX]; | |
161 | ||
162 | if (!trace_want(key)) | |
163 | return; | |
164 | ||
165 | if (!getcwd(cwd, PATH_MAX)) | |
166 | die("Unable to get current working directory"); | |
167 | ||
168 | if (!(git_work_tree = get_git_work_tree())) | |
169 | git_work_tree = "(null)"; | |
170 | ||
171 | if (!prefix) | |
172 | prefix = "(null)"; | |
173 | ||
174 | trace_printf_key(key, "setup: git_dir: %s\n", quote_crnl(get_git_dir())); | |
175 | trace_printf_key(key, "setup: worktree: %s\n", quote_crnl(git_work_tree)); | |
176 | trace_printf_key(key, "setup: cwd: %s\n", quote_crnl(cwd)); | |
177 | trace_printf_key(key, "setup: prefix: %s\n", quote_crnl(prefix)); | |
178 | } | |
179 | ||
180 | int trace_want(const char *key) | |
181 | { | |
182 | const char *trace = getenv(key); | |
183 | ||
184 | if (!trace || !strcmp(trace, "") || | |
185 | !strcmp(trace, "0") || !strcasecmp(trace, "false")) | |
186 | return 0; | |
187 | return 1; | |
188 | } |