196 lines
5.7 KiB
C
196 lines
5.7 KiB
C
/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "alloc-util.h"
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#include "mkdir.h"
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#include "parse-util.h"
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#include "proc-cmdline.h"
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#include "special.h"
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#include "string-util.h"
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#include "strv.h"
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#include "unit-name.h"
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#include "util.h"
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static char *arg_default_unit = NULL;
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static const char *arg_dest = "/tmp";
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static char **arg_mask = NULL;
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static char **arg_wants = NULL;
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static bool arg_debug_shell = false;
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static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
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int r;
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assert(key);
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if (streq(key, "systemd.mask")) {
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char *n;
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if (proc_cmdline_value_missing(key, value))
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return 0;
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r = unit_name_mangle(value, UNIT_NAME_NOGLOB, &n);
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if (r < 0)
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return log_error_errno(r, "Failed to glob unit name: %m");
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r = strv_consume(&arg_mask, n);
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if (r < 0)
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return log_oom();
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} else if (streq(key, "systemd.wants")) {
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char *n;
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if (proc_cmdline_value_missing(key, value))
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return 0;
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r = unit_name_mangle(value, UNIT_NAME_NOGLOB, &n);
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if (r < 0)
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return log_error_errno(r, "Failed to glob unit name: %m");
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r = strv_consume(&arg_wants, n);
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if (r < 0)
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return log_oom();
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} else if (proc_cmdline_key_streq(key, "systemd.debug_shell")) {
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if (value) {
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r = parse_boolean(value);
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if (r < 0)
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log_error("Failed to parse systemd.debug_shell= argument '%s', ignoring.", value);
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else
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arg_debug_shell = r;
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} else
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arg_debug_shell = true;
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} else if (streq(key, "systemd.unit")) {
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if (proc_cmdline_value_missing(key, value))
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return 0;
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r = free_and_strdup(&arg_default_unit, value);
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if (r < 0)
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return log_error_errno(r, "Failed to set default unit %s: %m", value);
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} else if (!value) {
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const char *target;
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target = runlevel_to_target(key);
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if (target) {
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r = free_and_strdup(&arg_default_unit, target);
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if (r < 0)
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return log_error_errno(r, "Failed to set default unit %s: %m", target);
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}
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}
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return 0;
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}
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static int generate_mask_symlinks(void) {
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char **u;
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int r = 0;
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if (strv_isempty(arg_mask))
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return 0;
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STRV_FOREACH(u, arg_mask) {
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_cleanup_free_ char *p = NULL;
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p = strjoin(arg_dest, "/", *u);
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if (!p)
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return log_oom();
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if (symlink("/dev/null", p) < 0)
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r = log_error_errno(errno,
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"Failed to create mask symlink %s: %m",
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p);
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}
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return r;
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}
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static int generate_wants_symlinks(void) {
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char **u;
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int r = 0;
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if (strv_isempty(arg_wants))
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return 0;
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STRV_FOREACH(u, arg_wants) {
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_cleanup_free_ char *p = NULL, *f = NULL;
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const char *target = arg_default_unit ?: SPECIAL_DEFAULT_TARGET;
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p = strjoin(arg_dest, "/", target, ".wants/", *u);
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if (!p)
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return log_oom();
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f = strappend(SYSTEM_DATA_UNIT_PATH "/", *u);
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if (!f)
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return log_oom();
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mkdir_parents_label(p, 0755);
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if (symlink(f, p) < 0)
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r = log_error_errno(errno,
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"Failed to create wants symlink %s: %m",
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p);
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}
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return r;
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}
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int main(int argc, char *argv[]) {
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int r, q;
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if (argc > 1 && argc != 4) {
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log_error("This program takes three or no arguments.");
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return EXIT_FAILURE;
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}
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if (argc > 1)
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arg_dest = argv[2];
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log_set_target(LOG_TARGET_SAFE);
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log_parse_environment();
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log_open();
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umask(0022);
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r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
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if (r < 0)
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log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
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if (arg_debug_shell) {
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r = strv_extend(&arg_wants, "debug-shell.service");
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if (r < 0) {
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r = log_oom();
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goto finish;
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}
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}
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r = generate_mask_symlinks();
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q = generate_wants_symlinks();
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if (q < 0)
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r = q;
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finish:
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arg_default_unit = mfree(arg_default_unit);
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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