Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

2 files changed, 186 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..8a474c5
--- /dev/null
+++ b/src/debug-generator/debug-generator.c
@@ -0,0 +1,178 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "dropin.h"
+#include "generator.h"
+#include "initrd-util.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);
diff --git a/src/debug-generator/meson.build b/src/debug-generator/meson.build
new file mode 100644
index 0000000..33cb344
--- /dev/null
+++ b/src/debug-generator/meson.build
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+executables += [
+        generator_template + {
+                'name' : 'systemd-debug-generator',
+                'sources' : files('debug-generator.c'),
+        },
+]