src/shared: refactor shared code

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>

1 files changed, 84 insertions, 0 deletions

diff --git a/src/shared/dev-setup.c b/src/shared/dev-setup.c
new file mode 100644
index 0000000000..1a565d5470
--- /dev/null
+++ b/src/shared/dev-setup.c
@@ -0,0 +1,84 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010-2012 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 <errno.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <unistd.h>
+
+#include "dev-setup.h"
+#include "log.h"
+#include "macro.h"
+#include "util.h"
+#include "label.h"
+
+static int symlink_and_label(const char *old_path, const char *new_path) {
+        int r;
+
+        assert(old_path);
+        assert(new_path);
+
+        r = label_context_set(new_path, S_IFLNK);
+        if (r < 0)
+                return r;
+
+        if (symlink(old_path, new_path) < 0)
+                r = -errno;
+
+        label_context_clear();
+
+        return r;
+}
+
+int dev_setup(const char *prefix) {
+        const char *j, *k;
+
+        static const char symlinks[] =
+                "-/proc/kcore\0"     "/dev/core\0"
+                "/proc/self/fd\0"    "/dev/fd\0"
+                "/proc/self/fd/0\0"  "/dev/stdin\0"
+                "/proc/self/fd/1\0"  "/dev/stdout\0"
+                "/proc/self/fd/2\0"  "/dev/stderr\0";
+
+        NULSTR_FOREACH_PAIR(j, k, symlinks) {
+                if (j[0] == '-') {
+                        j++;
+
+                        if (access(j, F_OK) < 0)
+                                continue;
+                }
+
+                if (prefix) {
+                        _cleanup_free_ char *link_name = NULL;
+
+                        link_name = strjoin(prefix, "/", k, NULL);
+                        if (!link_name)
+                                return -ENOMEM;
+
+                        symlink_and_label(j, link_name);
+                } else
+                        symlink_and_label(j, k);
+        }
+
+        return 0;
+}