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authorLennart Poettering <lennart@poettering.net>2014-06-19 16:10:55 +0200
committerLennart Poettering <lennart@poettering.net>2014-06-19 16:33:01 +0200
commit326bb68c40ff2a7119c344b9ab7a7473f9fcdf3c (patch)
tree3b5e75cb22ad73f045f72d76176566de0c7ee8ed /src/debug-generator
parentc806ffb9592fa9a2b13a1f9f9be4c77cd5b211aa (diff)
debug-generator: add new generator
debug-generator can mask specific units if they are specified on the kernel command line with systemd.mask=. debug-generator can pull in debug-shell.service is systemd.debug-shell is passed on the kernel command line.
Diffstat (limited to 'src/debug-generator')
l---------src/debug-generator/Makefile1
-rw-r--r--src/debug-generator/debug-generator.c137
2 files changed, 138 insertions, 0 deletions
diff --git a/src/debug-generator/Makefile b/src/debug-generator/Makefile
new file mode 120000
index 0000000000..d0b0e8e008
--- /dev/null
+++ b/src/debug-generator/Makefile
@@ -0,0 +1 @@
+../Makefile \ No newline at end of file
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;
+
+}