23e5e79a51
They would get assigned to an inactive target in the initramfs.
199 lines
6 KiB
C
199 lines
6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <unistd.h>
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#include "alloc-util.h"
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#include "dropin.h"
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#include "generator.h"
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#include "mkdir.h"
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#include "parse-util.h"
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#include "path-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-file.h"
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#include "unit-name.h"
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static const char *arg_dest = NULL;
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static char *arg_default_unit = NULL;
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static char **arg_mask = NULL;
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static char **arg_wants = NULL;
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static char *arg_debug_shell = NULL;
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STATIC_DESTRUCTOR_REGISTER(arg_default_unit, freep);
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STATIC_DESTRUCTOR_REGISTER(arg_mask, strv_freep);
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STATIC_DESTRUCTOR_REGISTER(arg_wants, strv_freep);
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STATIC_DESTRUCTOR_REGISTER(arg_debug_shell, freep);
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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_MANGLE_WARN, &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_MANGLE_WARN, &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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const char *t = NULL;
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r = value ? parse_boolean(value) : 1;
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if (r < 0)
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t = skip_dev_prefix(value);
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else if (r > 0)
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t = skip_dev_prefix(DEBUGTTY);
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if (free_and_strdup(&arg_debug_shell, t) < 0)
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return log_oom();
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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 = path_join(empty_to_root(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;
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/* This should match what do_queue_default_job() in core/main.c does. */
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if (arg_default_unit)
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target = arg_default_unit;
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else if (in_initrd())
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target = SPECIAL_INITRD_TARGET;
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else
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target = 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 = path_join(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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static void install_debug_shell_dropin(const char *dir) {
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int r;
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if (streq(arg_debug_shell, skip_dev_prefix(DEBUGTTY)))
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return;
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r = write_drop_in_format(dir, "debug-shell.service", 50, "tty",
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"[Unit]\n"
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"Description=Early root shell on /dev/%s FOR DEBUGGING ONLY\n"
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"ConditionPathExists=\n"
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"[Service]\n"
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"TTYPath=/dev/%s",
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arg_debug_shell, arg_debug_shell);
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if (r < 0)
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log_warning_errno(r, "Failed to write drop-in for debug-shell.service, ignoring: %m");
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}
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static int run(const char *dest, const char *dest_early, const char *dest_late) {
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int r, q;
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assert_se(arg_dest = dest_early);
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r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_RD_STRICT | PROC_CMDLINE_STRIP_RD_PREFIX);
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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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return log_oom();
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install_debug_shell_dropin(arg_dest);
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}
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r = generate_mask_symlinks();
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q = generate_wants_symlinks();
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return r < 0 ? r : q;
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}
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DEFINE_MAIN_GENERATOR_FUNCTION(run);
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