core/automount: Add ExtraOptions field

1 files changed, 33 insertions, 3 deletions

diff --git a/src/core/automount.c b/src/core/automount.c
index 0bb58fdcd1..02089aed4e 100644
--- a/src/core/automount.c
+++ b/src/core/automount.c
@@ -19,6 +19,7 @@
 #include "dbus-unit.h"
 #include "fd-util.h"
 #include "format-util.h"
+#include "fstab-util.h"
 #include "io-util.h"
 #include "label.h"
 #include "mkdir-label.h"
@@ -109,6 +110,7 @@ static void automount_done(Unit *u) {
         unmount_autofs(a);
 
         a->where = mfree(a->where);
+        a->extra_options = mfree(a->extra_options);
 
         a->tokens = set_free(a->tokens);
         a->expire_tokens = set_free(a->expire_tokens);
@@ -168,6 +170,15 @@ static int automount_add_default_dependencies(Automount *a) {
 }
 
 static int automount_verify(Automount *a) {
+        static const char *const reserved_options[] = {
+                "fd\0",
+                "pgrp\0",
+                "minproto\0",
+                "maxproto\0",
+                "direct\0",
+                "indirect\0",
+        };
+
         _cleanup_free_ char *e = NULL;
         int r;
 
@@ -184,6 +195,14 @@ static int automount_verify(Automount *a) {
         if (!unit_has_name(UNIT(a), e))
                 return log_unit_error_errno(UNIT(a), SYNTHETIC_ERRNO(ENOEXEC), "Where= setting doesn't match unit name. Refusing.");
 
+        for (size_t i = 0; i < ELEMENTSOF(reserved_options); i++)
+                if (fstab_test_option(a->extra_options, reserved_options[i]))
+                        return log_unit_error_errno(
+                                UNIT(a),
+                                SYNTHETIC_ERRNO(ENOEXEC),
+                                "ExtraOptions= setting may not contain reserved option %s.",
+                                reserved_options[i]);
+
         return 0;
 }
 
@@ -313,11 +332,13 @@ static void automount_dump(Unit *u, FILE *f, const char *prefix) {
                 "%sAutomount State: %s\n"
                 "%sResult: %s\n"
                 "%sWhere: %s\n"
+                "%sExtraOptions: %s\n"
                 "%sDirectoryMode: %04o\n"
                 "%sTimeoutIdleUSec: %s\n",
                 prefix, automount_state_to_string(a->state),
                 prefix, automount_result_to_string(a->result),
                 prefix, a->where,
+                prefix, a->extra_options,
                 prefix, a->directory_mode,
                 prefix, FORMAT_TIMESPAN(a->timeout_idle_usec, USEC_PER_SEC));
 }
@@ -552,8 +573,7 @@ static void automount_enter_waiting(Automount *a) {
         _cleanup_close_ int ioctl_fd = -1;
         int p[2] = { -1, -1 };
         char name[STRLEN("systemd-") + DECIMAL_STR_MAX(pid_t) + 1];
-        char options[STRLEN("fd=,pgrp=,minproto=5,maxproto=5,direct")
-                     + DECIMAL_STR_MAX(int) + DECIMAL_STR_MAX(gid_t) + 1];
+        _cleanup_free_ char *options = NULL;
         bool mounted = false;
         int r, dev_autofs_fd;
         struct stat st;
@@ -586,7 +606,17 @@ static void automount_enter_waiting(Automount *a) {
         if (r < 0)
                 goto fail;
 
-        xsprintf(options, "fd=%i,pgrp="PID_FMT",minproto=5,maxproto=5,direct", p[1], getpgrp());
+        if (asprintf(
+                    &options,
+                    "fd=%i,pgrp="PID_FMT",minproto=5,maxproto=5,direct%s%s",
+                    p[1],
+                    getpgrp(),
+                    isempty(a->extra_options) ? "" : ",",
+                    strempty(a->extra_options)) < 0) {
+                r = -ENOMEM;
+                goto fail;
+        }
+
         xsprintf(name, "systemd-"PID_FMT, getpid_cached());
         r = mount_nofollow(name, a->where, "autofs", 0, options);
         if (r < 0)