1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include "sd-journal.h"
#include "alloc-util.h"
#include "build.h"
#include "fd-util.h"
#include "format-util.h"
#include "main-func.h"
#include "parse-argument.h"
#include "parse-util.h"
#include "pretty-print.h"
#include "string-util.h"
#include "syslog-util.h"
#include "terminal-util.h"
static const char *arg_identifier = NULL;
static int arg_priority = LOG_INFO;
static int arg_stderr_priority = -1;
static bool arg_level_prefix = true;
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-cat", "1", &link);
if (r < 0)
return log_oom();
printf("%s [OPTIONS...] COMMAND ...\n"
"\n%sExecute process with stdout/stderr connected to the journal.%s\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" -t --identifier=STRING Set syslog identifier\n"
" -p --priority=PRIORITY Set priority value (0..7)\n"
" --stderr-priority=PRIORITY Set priority value (0..7) used for stderr\n"
" --level-prefix=BOOL Control whether level prefix shall be parsed\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
ansi_highlight(),
ansi_normal(),
link);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_STDERR_PRIORITY,
ARG_LEVEL_PREFIX
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "identifier", required_argument, NULL, 't' },
{ "priority", required_argument, NULL, 'p' },
{ "stderr-priority", required_argument, NULL, ARG_STDERR_PRIORITY },
{ "level-prefix", required_argument, NULL, ARG_LEVEL_PREFIX },
{}
};
int c, r;
assert(argc >= 0);
assert(argv);
/* Resetting to 0 forces the invocation of an internal initialization routine of getopt_long()
* that checks for GNU extensions in optstring ('-' or '+' at the beginning). */
optind = 0;
while ((c = getopt_long(argc, argv, "+ht:p:", options, NULL)) >= 0)
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
return version();
case 't':
if (isempty(optarg))
arg_identifier = NULL;
else
arg_identifier = optarg;
break;
case 'p':
arg_priority = log_level_from_string(optarg);
if (arg_priority < 0)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Failed to parse priority value.");
break;
case ARG_STDERR_PRIORITY:
arg_stderr_priority = log_level_from_string(optarg);
if (arg_stderr_priority < 0)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Failed to parse stderr priority value.");
break;
case ARG_LEVEL_PREFIX:
r = parse_boolean_argument("--level-prefix=", optarg, &arg_level_prefix);
if (r < 0)
return r;
break;
case '?':
return -EINVAL;
default:
assert_not_reached();
}
return 1;
}
static int run(int argc, char *argv[]) {
_cleanup_close_ int outfd = -EBADF, errfd = -EBADF, saved_stderr = -EBADF;
int r;
log_setup();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
outfd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix);
if (outfd < 0)
return log_error_errno(outfd, "Failed to create stream fd: %m");
if (arg_stderr_priority >= 0 && arg_stderr_priority != arg_priority) {
errfd = sd_journal_stream_fd(arg_identifier, arg_stderr_priority, arg_level_prefix);
if (errfd < 0)
return log_error_errno(errfd, "Failed to create stream fd: %m");
}
saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3);
r = rearrange_stdio(STDIN_FILENO, outfd, errfd < 0 ? outfd : errfd); /* Invalidates fd on success + error! */
TAKE_FD(outfd);
TAKE_FD(errfd);
if (r < 0)
return log_error_errno(r, "Failed to rearrange stdout/stderr: %m");
if (argc <= optind)
(void) execl("/bin/cat", "/bin/cat", NULL);
else {
_cleanup_free_ char *s = NULL;
struct stat st;
if (fstat(STDERR_FILENO, &st) < 0)
return log_error_errno(errno,
"Failed to fstat(%s): %m",
FORMAT_PROC_FD_PATH(STDERR_FILENO));
if (asprintf(&s, DEV_FMT ":" INO_FMT, (dev_t)st.st_dev, st.st_ino) < 0)
return log_oom();
if (setenv("JOURNAL_STREAM", s, /* overwrite = */ true) < 0)
return log_error_errno(errno, "Failed to set environment variable JOURNAL_STREAM: %m");
(void) execvp(argv[optind], argv + optind);
}
r = -errno;
/* Let's try to restore a working stderr, so we can print the error message */
if (saved_stderr >= 0)
(void) dup3(saved_stderr, STDERR_FILENO, 0);
return log_error_errno(r, "Failed to execute process: %m");
}
DEFINE_MAIN_FUNCTION(run);
|
