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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:35:18 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:35:18 +0000
commitb750101eb236130cf056c675997decbac904cc49 (patch)
treea5df1a06754bdd014cb975c051c83b01c9a97532 /src/debug-generator
parentInitial commit. (diff)
downloadsystemd-b750101eb236130cf056c675997decbac904cc49.tar.xz
systemd-b750101eb236130cf056c675997decbac904cc49.zip
Adding upstream version 252.22.upstream/252.22
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/debug-generator')
-rw-r--r--src/debug-generator/debug-generator.c177
1 files changed, 177 insertions, 0 deletions
diff --git a/src/debug-generator/debug-generator.c b/src/debug-generator/debug-generator.c
new file mode 100644
index 0000000..57b751f
--- /dev/null
+++ b/src/debug-generator/debug-generator.c
@@ -0,0 +1,177 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "dropin.h"
+#include "generator.h"
+#include "mkdir-label.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "proc-cmdline.h"
+#include "special.h"
+#include "string-util.h"
+#include "strv.h"
+#include "unit-file.h"
+#include "unit-name.h"
+
+static const char *arg_dest = NULL;
+static char *arg_default_unit = NULL;
+static char **arg_mask = NULL;
+static char **arg_wants = NULL;
+static char *arg_debug_shell = NULL;
+
+STATIC_DESTRUCTOR_REGISTER(arg_default_unit, freep);
+STATIC_DESTRUCTOR_REGISTER(arg_mask, strv_freep);
+STATIC_DESTRUCTOR_REGISTER(arg_wants, strv_freep);
+STATIC_DESTRUCTOR_REGISTER(arg_debug_shell, freep);
+
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
+ int r;
+
+ assert(key);
+
+ if (streq(key, "systemd.mask")) {
+ char *n;
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ r = unit_name_mangle(value, UNIT_NAME_MANGLE_WARN, &n);
+ if (r < 0)
+ return log_error_errno(r, "Failed to glob unit name: %m");
+
+ r = strv_consume(&arg_mask, n);
+ if (r < 0)
+ return log_oom();
+
+ } else if (streq(key, "systemd.wants")) {
+ char *n;
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ r = unit_name_mangle(value, UNIT_NAME_MANGLE_WARN, &n);
+ if (r < 0)
+ return log_error_errno(r, "Failed to glob unit name: %m");
+
+ r = strv_consume(&arg_wants, n);
+ if (r < 0)
+ return log_oom();
+
+ } else if (proc_cmdline_key_streq(key, "systemd.debug_shell")) {
+ const char *t = NULL;
+
+ r = value ? parse_boolean(value) : 1;
+ if (r < 0)
+ t = skip_dev_prefix(value);
+ else if (r > 0)
+ t = skip_dev_prefix(DEBUGTTY);
+
+ return free_and_strdup_warn(&arg_debug_shell, t);
+
+ } else if (streq(key, "systemd.unit")) {
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ return free_and_strdup_warn(&arg_default_unit, value);
+
+ } else if (!value) {
+ const char *target;
+
+ target = runlevel_to_target(key);
+ if (target)
+ return free_and_strdup_warn(&arg_default_unit, target);
+ }
+
+ return 0;
+}
+
+static int generate_mask_symlinks(void) {
+ int r = 0;
+
+ STRV_FOREACH(u, arg_mask) {
+ _cleanup_free_ char *p = NULL;
+
+ p = path_join(empty_to_root(arg_dest), *u);
+ if (!p)
+ return log_oom();
+
+ if (symlink("/dev/null", p) < 0)
+ r = log_error_errno(errno,
+ "Failed to create mask symlink %s: %m",
+ p);
+ }
+
+ return r;
+}
+
+static int generate_wants_symlinks(void) {
+ int r = 0;
+
+ STRV_FOREACH(u, arg_wants) {
+ _cleanup_free_ char *f = NULL;
+ const char *target;
+
+ /* This should match what do_queue_default_job() in core/main.c does. */
+ if (arg_default_unit)
+ target = arg_default_unit;
+ else if (in_initrd())
+ target = SPECIAL_INITRD_TARGET;
+ else
+ target = SPECIAL_DEFAULT_TARGET;
+
+ f = path_join(SYSTEM_DATA_UNIT_DIR, *u);
+ if (!f)
+ return log_oom();
+
+ r = generator_add_symlink(arg_dest, target, "wants", f);
+ if (r < 0)
+ return r;
+ }
+
+ return r;
+}
+
+static void install_debug_shell_dropin(const char *dir) {
+ int r;
+
+ if (streq(arg_debug_shell, skip_dev_prefix(DEBUGTTY)))
+ return;
+
+ r = write_drop_in_format(dir, "debug-shell.service", 50, "tty",
+ "[Unit]\n"
+ "Description=Early root shell on /dev/%s FOR DEBUGGING ONLY\n"
+ "ConditionPathExists=\n"
+ "[Service]\n"
+ "TTYPath=/dev/%s",
+ arg_debug_shell, arg_debug_shell);
+ if (r < 0)
+ log_warning_errno(r, "Failed to write drop-in for debug-shell.service, ignoring: %m");
+}
+
+static int run(const char *dest, const char *dest_early, const char *dest_late) {
+ int r, q;
+
+ assert_se(arg_dest = dest_early);
+
+ r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_RD_STRICT | PROC_CMDLINE_STRIP_RD_PREFIX);
+ if (r < 0)
+ log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
+
+ if (arg_debug_shell) {
+ r = strv_extend(&arg_wants, "debug-shell.service");
+ if (r < 0)
+ return log_oom();
+
+ install_debug_shell_dropin(arg_dest);
+ }
+
+ r = generate_mask_symlinks();
+ q = generate_wants_symlinks();
+
+ return r < 0 ? r : q;
+}
+
+DEFINE_MAIN_GENERATOR_FUNCTION(run);