From d49d95df0a260aaca9a3fdd1e6ce535592a53bca Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Wed, 6 Nov 2024 04:37:55 +0900
Subject: mount-util: introduce path_is_network_fs_harder()

It also detects e.g. glusterfs or mounts with "_netdev" option.
---
 src/shared/mount-util.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/shared/mount-util.h |  2 ++
 2 files changed, 70 insertions(+)

(limited to 'src/shared')

diff --git a/src/shared/mount-util.c b/src/shared/mount-util.c
index 3c89a18790..8ef952a035 100644
--- a/src/shared/mount-util.c
+++ b/src/shared/mount-util.c
@@ -19,6 +19,7 @@
 #include "fd-util.h"
 #include "fileio.h"
 #include "fs-util.h"
+#include "fstab-util.h"
 #include "glyph-util.h"
 #include "hashmap.h"
 #include "initrd-util.h"
@@ -1820,3 +1821,70 @@ char* umount_and_unlink_and_free(char *p) {
         (void) unlink(p);
         return mfree(p);
 }
+
+static int path_get_mount_info(
+                const char *path,
+                char **ret_fstype,
+                char **ret_options) {
+
+        _cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL;
+        _cleanup_free_ char *fstype = NULL, *options = NULL;
+        struct libmnt_fs *fs;
+        int r;
+
+        assert(path);
+
+        table = mnt_new_table();
+        if (!table)
+                return -ENOMEM;
+
+        r = mnt_table_parse_mtab(table, /* filename = */ NULL);
+        if (r < 0)
+                return r;
+
+        fs = mnt_table_find_mountpoint(table, path, MNT_ITER_FORWARD);
+        if (!fs)
+                return -EINVAL;
+
+        if (ret_fstype) {
+                fstype = strdup(strempty(mnt_fs_get_fstype(fs)));
+                if (!fstype)
+                        return -ENOMEM;
+        }
+
+        if (ret_options) {
+                options = strdup(strempty(mnt_fs_get_options(fs)));
+                if (!options)
+                        return -ENOMEM;
+        }
+
+        if (ret_fstype)
+                *ret_fstype = TAKE_PTR(fstype);
+        if (ret_options)
+                *ret_options = TAKE_PTR(options);
+
+        return 0;
+}
+
+int path_is_network_fs_harder(const char *path) {
+        _cleanup_free_ char *fstype = NULL, *options = NULL;
+        int r, ret;
+
+        assert(path);
+
+        ret = path_is_network_fs(path);
+        if (ret > 0)
+                return true;
+
+        r = path_get_mount_info(path, &fstype, &options);
+        if (r < 0)
+                return RET_GATHER(ret, r);
+
+        if (fstype_is_network(fstype))
+                return true;
+
+        if (fstab_test_option(options, "_netdev\0"))
+                return true;
+
+        return false;
+}
diff --git a/src/shared/mount-util.h b/src/shared/mount-util.h
index eb068d5b44..067ed0e4d9 100644
--- a/src/shared/mount-util.h
+++ b/src/shared/mount-util.h
@@ -180,3 +180,5 @@ unsigned long credentials_fs_mount_flags(bool ro);
 int mount_credentials_fs(const char *path, size_t size, bool ro);
 
 int make_fsmount(int error_log_level, const char *what, const char *type, unsigned long flags, const char *options, int userns_fd);
+
+int path_is_network_fs_harder(const char *path);
-- 
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