why should you read this?
this guide will be usefull for someone who want to make a patch, install an apk, or modify a rom with a simple update.zip file. most of android devices are using edify script instead of amend script. this guide will be applicable in almost every android devices. a simpe example of these script we can found on installer for theme. while the complicated one is aroma installer which are used for GUI installation for rom.
below are examples of functions used in an Edify Updater-script:
Function Name: mount
Function Syntax: mount(fs_type, partition_type, location, mount_point)
fs_type = yaffs2 ext4 ext2 ext3 rfs vfat
partition_type="MTD" | "EMMC"
location = partition | device
mount_point = target folder to mount FS.
Action: Mounts a filesystem to the defined mount point
Returns: The mount point if successful, null if failed
Function Name: is_mounted
Function Syntax: is_mounted(mount_point)
Parameter Details: mount_point = string, mount point to check if is mounted
Action: Checks if a filesystem is mounted.
Returns: The mount point if mounted, otherwise, returns null
Function Name: unmount
Function Syntax: unmount(mount_point)
Parameter Details: mount_point = string, mount point to unmount
Action: Unmounts the filesystem
Returns: The mount point that was dismounted if successful, otherwise it returns null
Function Name: format
Function Syntax: format(fs_type, partition_type, location)
fs_type = string,yaffs2 ext4 ext2 ext3 rfs vfat
partition_type= string, "MTD" | "EMMC"
location = string, partition | device
Action: Formats a filesystem as specified
Function Name: delete
Function Syntax: delete(file1, file2, ..., fileN)
Parameter Details: string, file to delete
Action: Deletes a file. Must specify at least one file; multiple files can be specified as multiple arguments
Function Name: delete_recursive
Function Syntax: delete_recursive(dir1, dir2,...,dirN)
Parameter Details: string, directory to recursively delete
Action: Deletes a folder and all of its contents. At least 1 directory must be specified; multiple directories can be specified as additional arguments.
Function Name: show_progress
Function Syntax: show_progress(frac, sec)
frac = fraction of progress completed
sec = total seconds
Action: Displays flashing progress in the recovery system
Function Name: set_progress
Function Syntax: set_prograss(frac)
Parameter Details: frac=fraction of progress
Function Name: package_extract_dir
Function Syntax: package_extract_dir(package_path, destination_path)
package_path = string, directory in package to extract
destination_path = string, target point to extract files to
Action: Extract the all of the files in a directory in the package to the target specified.
Function Name: package_extract_file
package_path = string, file in the package you want to extract
destination_path, target folder to extract the file to.
Action: Extracts a single file from your update package to the target specified
Function Name: file_getprop
Function Syntax: file_getprop(file, key)
file = string, filename to check
key = string, key in file to return the value of
Action: Checks for a value in a file?
Function Name: symlink
Function Syntax: symlink(target, src1, src2, ..., srcN)
target = string, the target of the symbolic link
srcX = the symbolic link to create that points to the target
Action: Unlinks any existing symbolic links before creating the new symbolic links.
Function Name: set_perm
Function Syntax: set_perm(uid, gid, mode, file1, file2, ..., fileN)
uid = user id
gid = group id
mode = permission mode
fileX = file to set permission on
Action: Sets permissions of a file or set of files specified. At least one file must be specified (the first four parameters are required)
Function Name: set_perm_recursive
Function Syntax: set_perm_recursive(uid, gid, dirmode, filemode, dir1, dir2, ...dirN)
uid = user id
gid = group id
dirmode = permission to set to directories contained within the specified directory
filemode = permission to set to files contained within the specified directory
dirX = directory to set permission on
Action: Set permissions of a directory or set of directories and all files and folders within them. At least one directory must be specified (The first 5 parameters are required)
Function Name: getprop
Function Syntax: getprop(key)
Parameter Details: key = string, the property you want the system to return
Action: This function returns the value of the property specified. This is used to query platform information from the build.props file.
Function Name: write_raw_image
Function Syntax: write_raw_image(file, partition)
file - string, the source .img file to be read from
partition - string, the destination partition to write the .img file to
Description: This function writes an img file to a partition.
Function Name: apply_patch
Function Syntax: apply_patch(srcfile, tgtfile, tgtsha1, tgtsize, sha1_1, patch_1, ..., sha1_x, patch1_x)
srcfile - string, source file to be patched (file to read in)
tgtfile - string, destination file to write the patched file to
tgtsha1 - string, sha1 hash of the target file as it should hash out after the patches apply properly
sha1_x - string, sha1 hash of the patch data that's to be written to the target file
patch1_x- string, actual patch to apply to the target file
Action: This function is used to apply patches to a file.
Function Name: apply_patch_check
Function Syntax: apply_patch_check(file, sha1_1, ..., sha1_x)
file - string, file to check
sha1_x - hash to check for?
Action: Either checks if a file has been properly patched, or checks if a file can be patched. Need to check the source code of the "applypatch_check" function that is called from here.
Function Name: apply_patch_space
Function Syntax: apply_patch_space(bytes)
Parameter Details: bytes = number of bytes to check for
Action: Checks the cache to verify that there is enough space to write the patched files to it and returns something. Need to test this function to verify.
Function Name: read_file
Function Syntax: read_file(filename)
Parameter Details: filename - string, the filename to read the contents of
Action: This function returns the contents of a file.
Function Name: sha1_check
sha1_check(data, sha1_hex, ..., sha1_hexN)
data - the contents of file to calculate the sha1 hash of - must be in the read_file format
sha1_hexN - A particular sha1_hex string that you want the file data to match
Action: If only data is specified, then the function returns the sha1_hex string of the data. The optional parameters are used if you want to verify that the file you are checking for is one of a list of hashes. It reutrns the hash it matches, or returns nothing if it doesn't match any of the mentioned hashses.
Function Name: ui_print
Function Syntax: ui_print(msg1, ..., msgN)
Parameter Details: msg - String, message to be outputted to the user during the patch process
Action: This function prints/echos a message to the console while the script is running. At least 1 parameter needs to be specified, you can specify additional msg parameters and they will be concatenated to the output.
Function Name: run_program
Function Syntax: run_program(prog, arg1, .., argN)
prog - string, program to execute
argN - string, arguments for the program that is being executed
Description: Executes a program with the arguments specified. Returns a string, I assume it is the buffer of the stdout of the program executed, need to test.
Function Name: ifelse
Function Syntax: ifelse(condition, truecondition, falsecondition)
condition - an expression to evaluate
truecondition - Edify script block to execute if true
falsecodnition - Edify script block to execute if false
Description: This is the if-then construct of the Edify scripting language. The truecondition or falsecondition arguments can be a single edify command or a script block. Script blocks can be formed by enclosing the parameter with parenthesis, and seperating the commands with semicolons\
Function Name: abort
Function Syntax: abort()
Parameter Details: no paremeters
Description: Aborts script execution.
Function Name: assert
Function Syntax: assert(condition)
Parameter Details: condition - boolean
Description: If condition evaluates to false, stops script execution, otherwise continues processing.
this one is an example of updater script for roms
1. that file used to enable bootanimation on dxlb or newer firmware. it is still in progress so don't install it. you can use that file as a base to create your own installer zip with edify script.
2. don't use notepad to edit the file. you can use notepad++ instead.
3. all syntax inside () is always within ". for an example, syntax for mount is 'mount(fs_type, partition_type, location, mount_point)', so if we want to mount the system partition we'll type 'mount("rfs", "EMMC", "/dev/block/stl19", "/system")'.