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website: Add docs for REMOVE

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tiann
2023-03-27 15:17:55 +08:00
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website/docs/guide/difference-with-magisk.md
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@@ -23,3 +23,4 @@ Here are some differences:
- KernelSU modules do not have built-in support for Zygisk (but you can use Zygisk modules through [ZygiskOnKernelSU](https://github.com/Dr-TSNG/ZygiskOnKernelSU).
- The method for replacing or deleting files in KernelSU modules is completely different from Magisk. KernelSU does not support the `.replace` method. Instead, you need to create a same-named file with `mknod filename c 0 0` to delete the corresponding file.
- The directories for BusyBox are different. The built-in BusyBox in KernelSU is located in `/data/adb/ksu/bin/busybox`, while in Magisk it is in `/data/adb/magisk/busybox`. **Note that this is an internal behavior of KernelSU and may change in the future!**
- KernelSU does not support `.replace` files and `REPLACE` variable; however, KernelSU supports the `REMOVE` variable and `mknod <TARGET> c 0 0` command to remove files and folders.

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website/docs/guide/module.md
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@@ -119,6 +119,17 @@ The contents of this directory will be overlaid on top of the system's /system p
If you want to delete a file or folder in the original system directory, you need to create a file with the same name as the file/folder in the module directory using `mknod filename c 0 0`. This way, the overlayfs system will automatically "whiteout" this file as if it has been deleted (the /system partition is not actually changed).
You can also declare a variable named `REMOVE` containing a list of directories in `customize.sh` to execute removal operations, and KernelSU will automatically execute `mknod <TARGET> c 0 0` in the corresponding directories of the module. For example:
```sh
REMOVE="
/system/app/YouTube
/system/app/Bloatware
"
```
The above list will execute `mknod $MODPATH/system/app/YouTuBe c 0 0` and `mknod $MODPATH/system/app/Bloatware c 0 0`; and `/system/app/YouTube` and `/system/app/Bloatware` will be removed after the module takes effect.
::: tip difference with Magisk
KernelSU's systemless mechanism is implemented through the kernel's overlayfs, while Magisk currently uses magic mount (bind mount). The two implementation methods have significant differences, but the ultimate goal is the same: to modify /system files without physically modifying the /system partition.