Added nmount notes

1 files changed, 134 insertions, 1 deletions

diff --git a/md/notes/xos/nmount.md b/md/notes/xos/nmount.md
index 7c3ed8d..8cfca03 100644
--- a/md/notes/xos/nmount.md
+++ b/md/notes/xos/nmount.md
@@ -1,4 +1,137 @@
 title:nmount - alternative mount
 keywords:linux,qemu,mount.linux,
 
-# nmount - alternative mount
\ No newline at end of file
+# nmount - alternative mount
+
+## Intro
+
+So simple mount utility, to mount files and give params to mount syscall.
+
+
+## Ideas
+
+Busybox needs /etc/fstab to work, minibase where using predefined locations.
+If this is all removed then its become portable tool.
+
+Minibase - 
+https://github.com/arsv/minibase/blob/master/src/root/kmount.c  
+
+Mount syscall -
+https://man7.org/linux/man-pages/man2/mount.2.html  
+
+```c
+#include <sys/mount.h>
+
+int mount(
+    const char*     source, 
+    const char*     target,
+    const char*     filesystemtype, 
+    unsigned long   mountflags,
+    const void*     data);
+```
+
+Syscall looks pretty simple
+
+So comamnd looks simple to check with filesystems kernel supports check
+procfs /proc/filesystems
+
+
+Run:
+```
+cat /proc/filesystems
+```
+Output:
+```
+nodev   sysfs
+nodev   tmpfs
+nodev   bdev
+nodev   proc
+nodev   cgroup
+nodev   cgroup2
+nodev   cpuset
+nodev   devtmpfs
+nodev   binfmt_misc
+nodev   configfs
+nodev   debugfs
+nodev   tracefs
+nodev   securityfs
+nodev   sockfs
+nodev   bpf
+nodev   pipefs
+nodev   ramfs
+nodev   hugetlbfs
+nodev   devpts
+nodev   autofs
+nodev   mqueue
+nodev   pstore
+        ext3
+        ext2
+        ext4
+nodev   vboxsf
+        vfat
+        fuseblk
+nodev   fuse
+nodev   fusectl
+```
+
+## Use
+
+Currently help is supproted for procfs,devtmpfs and sysfs. Next to add is ext4
+
+```
+nmount_static -v -t proc -d /Process -f nosuid,nodev,noexec,realtime
+nmount_static -v -t devtmpfs -d /Devices -f nosuid
+nmount_static -v -t sysfs -d /System -f nosuid,nodec,nosuid,realtime
+```
+
+available options
+```
+Usage: ./nmount [OPTS]
+
+Version: 0.0.1 
+-s source directory
+-d target directory
+-t filesystem type
+-f mount flags
+-o mount fs options
+-v verbose output
+-h help options
+-a helper for filetype options
+```
+
+output help thats shows all availiable options, for fs
+```
+./nmount -f proc -a
+devtmpfs /Device
+mqueue /MQueue/
+proc /Process
+    hidepid=%u 
+        0 Everybody may access all proc
+        1 User can access only their own proc, not other /proc/[pid]
+        2 As for mode 1, extra hides pid directories of others
+    gid=%u user group that can access process
+        gid usergroup who sees /proc in mode 0
+tmpfs /Ram
+sysfs /System
+ext4 (null)
+vfat (null)
+
+```
+
+Its create directory if its not excist
+
+## Source
+
+http://git.main.lv/cgit.cgi/nmount.git/
+
+Compile:
+```
+make
+```
+
+create one dynamic and one static binary
+
+
+## Links
+https://man7.org/linux/man-pages/man2/mount.2.html
+https://github.com/arsv/minibase/blob/master/src/root/kmount.c