Kettenoeler/Software/prepare_littlefs.py

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# SCRIPT TO GZIP CRITICAL FILES FOR ACCELERATED WEBSERVING
# see also https://community.platformio.org/t/question-esp32-compress-files-in-data-to-gzip-before-upload-possible-to-spiffs/6274/10
import glob
import shutil
import gzip
import os
Import("env")
Import("projenv")
def gzip_file(src_path, dst_path):
with open(src_path, 'rb') as src, gzip.open(dst_path, 'wb') as dst:
for chunk in iter(lambda: src.read(4096), b""):
dst.write(chunk)
def getListOfFiles(dirName):
# create a list of file and sub directories
# names in the given directory
listOfFile = os.listdir(dirName)
allFiles = list()
# Iterate over all the entries
for entry in listOfFile:
# Create full path
fullPath = os.path.join(dirName, entry)
# If entry is a directory then get the list of files in this directory
if os.path.isdir(fullPath):
allFiles = allFiles + getListOfFiles(fullPath)
else:
allFiles.append(fullPath)
return allFiles
def remove_prefix(text, prefix):
if text.startswith(prefix):
return text[len(prefix):]
return text # or whatever
# Compress files from 'data_src/' to 'data/'
def gzip_webfiles(source, target, env):
# Filetypes to compress
filetypes_to_gzip = ['.css', '.png', '.js', '.ico']
print('\nGZIP: Starting gzip-Process for LittleFS-Image...\n')
data_src_dir_path = os.path.join(env.get('PROJECT_DIR'), 'data_src')
data_dir_path = env.get('PROJECT_DATA_DIR')
# check if data and datasrc exist. If the first exists and not the second, it renames it
if(os.path.exists(data_dir_path) and not os.path.exists(data_src_dir_path)):
print('GZIP: Directory "'+data_dir_path +
'" exists, "'+data_src_dir_path+'" is not found.')
print('GZIP: Renaming "' + data_dir_path +
'" to "' + data_src_dir_path + '"')
os.rename(data_dir_path, data_src_dir_path)
# Delete the 'data' directory
if(os.path.exists(data_dir_path)):
print('GZIP: Deleting the "data" directory ' + data_dir_path)
shutil.rmtree(data_dir_path)
# Recreate empty 'data' directory
print('GZIP: Re-creating an empty data directory ' + data_dir_path)
os.mkdir(data_dir_path)
# Determine the files to compress
files_to_copy = []
files_to_gzip = []
all_data_src = getListOfFiles(data_src_dir_path)
for file in all_data_src:
file_name, file_extension = os.path.splitext(file)
print(file_name + " has filetype " + file_extension)
if file_extension in filetypes_to_gzip:
files_to_gzip.append(file)
else:
filename_subdir = remove_prefix(file, data_src_dir_path)
files_to_copy.append(filename_subdir)
for file in files_to_copy:
print('GZIP: Copying file from: ' + data_src_dir_path + file + ' to: ' + data_dir_path + file)
os.makedirs(os.path.dirname(data_dir_path + file), exist_ok=True)
shutil.copy(data_src_dir_path + file, data_dir_path + file)
# Compress and move files
was_error = False
try:
for source_file_path in files_to_gzip:
print('GZIP: compressing... ' + source_file_path)
filename_subdir = remove_prefix(source_file_path, data_src_dir_path)
target_file_path = data_dir_path + filename_subdir
os.makedirs(os.path.dirname(target_file_path), exist_ok=True)
print('GZIP: Compressed... ' + target_file_path)
gzip_file(source_file_path, target_file_path + ".gz")
except IOError as e:
was_error = True
print('GZIP: Failed to compress file: ' + source_file_path)
# print( 'GZIP: EXCEPTION... {}'.format( e ) )
if was_error:
print('GZIP: Failure/Incomplete.\n')
else:
print('GZIP: Compressed correctly.\n')
# IMPORTANT, this needs to be added to call the routine
env.AddPreAction('$BUILD_DIR/littlefs.bin', gzip_webfiles)