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# MultiROM reference installer | ||
This is a reference installer file structure. | ||
It should be used only for Linux | ||
based ROMs, where classic update.zip format is unsuitable. | ||
|
||
## Installation file | ||
The installation file itself is a ZIP archive, renamed to `*.mrom` so that | ||
recovery can know what is just ZIP archive and what is MultiROM | ||
installer | ||
file. | ||
I recommend not to use compression when making this ZIP, the installation | ||
will be faster and the ROM is already compressed in .tar.gz files. | ||
|
||
### Content | ||
* **manifest.txt** - File with info for the recovery. Read the comments in that | ||
file to know more. | ||
|
||
* **rom** - Folder with tar.gz archives containing each of the ROM base folders | ||
(e.g. `root.tar.gz`, `system.tar.gz`, ...). These can be split to | ||
multiple files (and should be, if the file is bigger than ~800 MB). | ||
Pattern is name_XX.tar.gz, so for example `root_00.tar.gz` and | ||
`root_01.tar.gz`. Numbering __must__ start at 00! | ||
Command `tar --numeric-owner --overwrite -xf` is used to extract | ||
these tar files. | ||
|
||
* **root_dir** - Content of this folder will be copied to root of the ROM | ||
folder - `/sdcard/multirom/roms/*rom_name*`. It can contain | ||
`rom_info.txt` if it's Linux ROM or the `boot` folder and/or | ||
`boot.img` if it's Android-based ROM. | ||
|
||
* **pre_install, post_install** - Sh scripts in these folders will be ran | ||
before/after the installation. They must return success return | ||
code else the installation is aborted. Path to root | ||
folder/folder where images are mounted is | ||
passed as argument to this script, script can then cd to one of | ||
the base folders and do whatever it wants to. Scripts are ran | ||
in alphabetical order (use numbers, `01_script.sh`, `02_script.sh`). | ||
**All** files from both directories are extracted to `/tmp/script/`, | ||
which means you can put e.g. binary blobs in there and copy them | ||
to proper place in the sh scripts or pack some binaries needed | ||
by the scripts (e.g. gnutar, remember to set chmod before running them). | ||
# MultiROM reference installer | ||
This is a reference installer file structure. | ||
It should be used only for Linux | ||
based ROMs, where classic update.zip format is unsuitable. | ||
|
||
## Installation file | ||
The installation file itself is a ZIP archive, renamed to `*.mrom` so that | ||
recovery can know what is just ZIP archive and what is MultiROM | ||
installer | ||
file. | ||
I recommend not to use compression when making this ZIP, the installation | ||
will be faster and the ROM is already compressed in .tar.gz files. | ||
|
||
While this format should be versatile enough, feel free to contact me if you | ||
need something changed - if it is reasonable, there will be no problem | ||
adding changes you need. | ||
|
||
### Content | ||
* **manifest.txt** - File with info for the recovery. Read the comments in that | ||
file to know more. | ||
|
||
* **rom** - Folder with tar.gz archives containing each of the ROM base folders | ||
(e.g. `root.tar.gz`, `system.tar.gz`, ...). These can be split to | ||
multiple files (and should be, if the file is bigger than ~800 MB). | ||
Pattern is name_XX.tar.gz, so for example `root_00.tar.gz` and | ||
`root_01.tar.gz`. Numbering __must__ start at 00! | ||
Command `tar --numeric-owner --overwrite -xf` is used to extract | ||
these tar files. | ||
|
||
* **root_dir** - Content of this folder will be copied to root of the ROM | ||
folder - `/sdcard/multirom/roms/*rom_name*`. It can contain | ||
`rom_info.txt` if it's Linux ROM or the `boot` folder and/or | ||
`boot.img` if it's Android-based ROM. | ||
|
||
* **pre_install, post_install** - Sh scripts in these folders will be ran | ||
before/after the installation. They must return success return | ||
code else the installation is aborted. Path to root | ||
folder/folder where images are mounted is | ||
passed as argument to this script, script can then cd to one of | ||
the base folders and do whatever it wants to. Scripts are ran | ||
in alphabetical order (use numbers, `01_script.sh`, `02_script.sh`). | ||
**All** files from both directories are extracted to `/tmp/script/`, | ||
which means you can put e.g. binary blobs in there and copy them | ||
to proper place in the sh scripts or pack some binaries needed | ||
by the scripts (e.g. gnutar, remember to set chmod before running them). |
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