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-rw-r--r--src/debug-generator/debug-generator.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/src/debug-generator/debug-generator.c b/src/debug-generator/debug-generator.c
new file mode 100644
index 0000000000..cefac89d11
--- /dev/null
+++ b/src/debug-generator/debug-generator.c
@@ -0,0 +1,137 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2014 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "util.h"
+#include "strv.h"
+#include "unit-name.h"
+#include "mkdir.h"
+
+static const char *arg_dest = "/tmp";
+static char **arg_mask = NULL;
+static bool arg_debug_shell = false;
+
+static int parse_proc_cmdline_item(const char *key, const char *value) {
+ int r;
+
+ if (streq(key, "systemd.mask")) {
+
+ if (!value)
+ log_error("Missing argument for systemd.mask= kernel command line parameter.");
+ else {
+ char *n;
+
+ n = strdup(value);
+ if (!n)
+ return log_oom();
+
+ r = strv_consume(&arg_mask, n);
+ if (r < 0)
+ return log_oom();
+ }
+ } else if (streq(key, "systemd.debug-shell")) {
+
+ if (value) {
+ r = parse_boolean(value);
+ if (r < 0)
+ log_error("Failed to parse systemd.debug-shell= argument '%s', ignoring.", value);
+ else
+ arg_debug_shell = r;
+ } else
+ arg_debug_shell = true;
+ }
+
+ return 0;
+}
+
+static int generate_mask_symlinks(void) {
+ char **u;
+ int r = 0;
+
+ if (strv_isempty(arg_mask))
+ return 0;
+
+ STRV_FOREACH(u, arg_mask) {
+ _cleanup_free_ char *m = NULL, *p = NULL;
+
+ m = unit_name_mangle(*u, MANGLE_NOGLOB);
+ if (!m)
+ return log_oom();
+
+ p = strjoin(arg_dest, "/", m, NULL);
+ if (!p)
+ return log_oom();
+
+ if (symlink("/dev/null", p) < 0) {
+ log_error("Failed to create mask symlink %s: %m", p);
+ r = -errno;
+ }
+ }
+
+ return r;
+}
+
+static int generate_debug_shell_symlink(void) {
+ const char *p;
+
+ if (!arg_debug_shell)
+ return 0;
+
+ p = strappenda(arg_dest, "/default.target.wants/debug-shell.service");
+
+ mkdir_parents_label(p, 0755);
+
+ if (symlink(SYSTEM_DATA_UNIT_PATH "/debug-shell.service", p) < 0) {
+ log_error("Failed to create %s symlink: %m", p);
+ return -errno;
+ }
+
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ int r, q;
+
+ if (argc > 1 && argc != 4) {
+ log_error("This program takes three or no arguments.");
+ return EXIT_FAILURE;
+ }
+
+ if (argc > 1)
+ arg_dest = argv[2];
+
+ log_set_target(LOG_TARGET_SAFE);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ if (parse_proc_cmdline(parse_proc_cmdline_item) < 0)
+ return EXIT_FAILURE;
+
+ r = generate_mask_symlinks();
+
+ q = generate_debug_shell_symlink();
+ if (q < 0)
+ r = q;
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+
+}