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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include "alloc-util.h"
#include "log.h"
#include "main-func.h"
#include "path-util.h"
#include "pretty-print.h"
#include "string-util.h"
#include "strv.h"
#include "unit-name.h"
static enum {
ACTION_ESCAPE,
ACTION_UNESCAPE,
ACTION_MANGLE
} arg_action = ACTION_ESCAPE;
static const char *arg_suffix = NULL;
static const char *arg_template = NULL;
static bool arg_path = false;
static bool arg_instance = false;
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-escape", "1", &link);
if (r < 0)
return log_oom();
printf("%s [OPTIONS...] [NAME...]\n\n"
"Escape strings for usage in systemd unit names.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --suffix=SUFFIX Unit suffix to append to escaped strings\n"
" --template=TEMPLATE Insert strings as instance into template\n"
" --instance With --unescape, show just the instance part\n"
" -u --unescape Unescape strings\n"
" -m --mangle Mangle strings\n"
" -p --path When escaping/unescaping assume the string is a path\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
link);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_SUFFIX,
ARG_TEMPLATE
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "suffix", required_argument, NULL, ARG_SUFFIX },
{ "template", required_argument, NULL, ARG_TEMPLATE },
{ "unescape", no_argument, NULL, 'u' },
{ "mangle", no_argument, NULL, 'm' },
{ "path", no_argument, NULL, 'p' },
{ "instance", no_argument, NULL, 'i' },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hump", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_SUFFIX: {
UnitType t = unit_type_from_string(optarg);
if (t < 0)
return log_error_errno(t, "Invalid unit suffix type \"%s\".", optarg);
arg_suffix = optarg;
break;
}
case ARG_TEMPLATE:
if (!unit_name_is_valid(optarg, UNIT_NAME_TEMPLATE))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Template name %s is not valid.", optarg);
arg_template = optarg;
break;
case 'u':
arg_action = ACTION_UNESCAPE;
break;
case 'm':
arg_action = ACTION_MANGLE;
break;
case 'p':
arg_path = true;
break;
case 'i':
arg_instance = true;
break;
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if (optind >= argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Not enough arguments.");
if (arg_template && arg_suffix)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"--suffix= and --template= may not be combined.");
if ((arg_template || arg_suffix) && arg_action == ACTION_MANGLE)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"--suffix= and --template= are not compatible with --mangle.");
if (arg_suffix && arg_action == ACTION_UNESCAPE)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"--suffix is not compatible with --unescape.");
if (arg_path && !IN_SET(arg_action, ACTION_ESCAPE, ACTION_UNESCAPE))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"--path may not be combined with --mangle.");
if (arg_instance && arg_action != ACTION_UNESCAPE)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"--instance must be used in conjunction with --unescape.");
if (arg_instance && arg_template)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"--instance may not be combined with --template.");
return 1;
}
static int run(int argc, char *argv[]) {
int r;
log_setup();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
STRV_FOREACH(i, argv + optind) {
_cleanup_free_ char *e = NULL;
switch (arg_action) {
case ACTION_ESCAPE:
if (arg_path) {
r = unit_name_path_escape(*i, &e);
if (r < 0) {
if (r == -EINVAL) {
/* If escaping failed because the string was invalid, let's print a
* friendly message about it. Catch these specific error cases
* explicitly. */
if (!path_is_valid(*i))
return log_error_errno(r, "Input '%s' is not a valid file system path, failed to escape.", *i);
if (!path_is_absolute(*i))
return log_error_errno(r, "Input '%s' is not an absolute file system path, failed to escape.", *i);
if (!path_is_normalized(*i))
return log_error_errno(r, "Input '%s' is not a normalized file system path, failed to escape.", *i);
}
/* All other error cases. */
return log_error_errno(r, "Failed to escape string: %m");
}
/* If the escaping worked, then still warn if the path is not like we'd like
* it. Because that means escaping is not necessarily reversible. */
if (!path_is_valid(*i))
log_warning("Input '%s' is not a valid file system path, escaping is likely not going be reversible.", *i);
else if (!path_is_absolute(*i))
log_warning("Input '%s' is not an absolute file system path, escaping is likely not going to be reversible.", *i);
/* Note that we don't complain about paths not being normalized here, because
* some forms of non-normalization is actually OK, such as a series // and
* unit_name_path_escape() will clean those up silently, and the reversal is
* "close enough" to be OK. */
} else {
e = unit_name_escape(*i);
if (!e)
return log_oom();
}
if (arg_template) {
char *x;
r = unit_name_replace_instance(arg_template, e, &x);
if (r < 0)
return log_error_errno(r, "Failed to replace instance: %m");
free_and_replace(e, x);
} else if (arg_suffix) {
if (!strextend(&e, ".", arg_suffix))
return log_oom();
}
break;
case ACTION_UNESCAPE: {
_cleanup_free_ char *name = NULL;
if (arg_template || arg_instance) {
_cleanup_free_ char *template = NULL;
r = unit_name_to_instance(*i, &name);
if (r < 0)
return log_error_errno(r, "Failed to extract instance: %m");
if (isempty(name))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Unit %s is missing the instance name.", *i);
r = unit_name_template(*i, &template);
if (r < 0)
return log_error_errno(r, "Failed to extract template: %m");
if (arg_template && !streq(arg_template, template))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Unit %s template %s does not match specified template %s.",
*i, template, arg_template);
} else {
name = strdup(*i);
if (!name)
return log_oom();
}
if (arg_path)
r = unit_name_path_unescape(name, &e);
else
r = unit_name_unescape(name, &e);
if (r < 0)
return log_error_errno(r, "Failed to unescape string: %m");
break;
}
case ACTION_MANGLE:
r = unit_name_mangle(*i, 0, &e);
if (r < 0)
return log_error_errno(r, "Failed to mangle name: %m");
break;
}
if (i != argv + optind)
fputc(' ', stdout);
fputs(e, stdout);
}
fputc('\n', stdout);
return 0;
}
DEFINE_MAIN_FUNCTION(run);
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