1 files changed, 101 insertions, 0 deletions
diff --git a/src/quotacheck/quotacheck.c b/src/quotacheck/quotacheck.c
new file mode 100644
index 0000000..27a914d
--- /dev/null
+++ b/src/quotacheck/quotacheck.c
@@ -0,0 +1,101 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <sys/prctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "main-func.h"
+#include "proc-cmdline.h"
+#include "process-util.h"
+#include "signal-util.h"
+#include "string-util.h"
+
+static bool arg_skip = false;
+static bool arg_force = false;
+
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
+
+        if (streq(key, "quotacheck.mode")) {
+
+                if (proc_cmdline_value_missing(key, value))
+                        return 0;
+
+                if (streq(value, "auto"))
+                        arg_force = arg_skip = false;
+                else if (streq(value, "force"))
+                        arg_force = true;
+                else if (streq(value, "skip"))
+                        arg_skip = true;
+                else
+                        log_warning("Invalid quotacheck.mode= parameter '%s'. Ignoring.", value);
+        }
+
+#if HAVE_SYSV_COMPAT
+        else if (streq(key, "forcequotacheck") && !value) {
+                log_warning("Please use 'quotacheck.mode=force' rather than 'forcequotacheck' on the kernel command line.");
+                arg_force = true;
+        }
+#endif
+
+        return 0;
+}
+
+static void test_files(void) {
+
+#if HAVE_SYSV_COMPAT
+        if (access("/forcequotacheck", F_OK) >= 0) {
+                log_error("Please pass 'quotacheck.mode=force' on the kernel command line rather than creating /forcequotacheck on the root file system.");
+                arg_force = true;
+        }
+#endif
+}
+
+static int run(int argc, char *argv[]) {
+        int r;
+
+        log_setup();
+
+        if (argc > 1)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "This program takes no arguments.");
+
+        umask(0022);
+
+        r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
+        if (r < 0)
+                log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
+
+        test_files();
+
+        if (!arg_force) {
+                if (arg_skip)
+                        return 0;
+
+                if (access("/run/systemd/quotacheck", F_OK) < 0)
+                        return 0;
+        }
+
+        r = safe_fork("(quotacheck)", FORK_RESET_SIGNALS|FORK_DEATHSIG_SIGTERM|FORK_RLIMIT_NOFILE_SAFE|FORK_WAIT|FORK_LOG, NULL);
+        if (r < 0)
+                return r;
+        if (r == 0) {
+                static const char * const cmdline[] = {
+                        QUOTACHECK,
+                        "-anug",
+                        NULL
+                };
+
+                /* Child */
+
+                execv(cmdline[0], (char**) cmdline);
+                _exit(EXIT_FAILURE); /* Operational error */
+        }
+
+        return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);