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title:nmount - alternative mount
keywords:linux,qemu,mount.linux,
# 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
|
