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# YOLOv5 🚀 by Ultralytics, AGPL-3.0 license
"""
Download utils
"""
import logging
import os
import subprocess
import urllib
from pathlib import Path
import requests
import torch
def is_url(url, check=True):
# Check if string is URL and check if URL exists
try:
url = str(url)
result = urllib.parse.urlparse(url)
assert all([result.scheme, result.netloc]) # check if is url
return (urllib.request.urlopen(url).getcode() == 200) if check else True # check if exists online
except (AssertionError, urllib.request.HTTPError):
return False
def gsutil_getsize(url=''):
# gs://bucket/file size https://cloud.google.com/storage/docs/gsutil/commands/du
output = subprocess.check_output(['gsutil', 'du', url], shell=True, encoding='utf-8')
if output:
return int(output.split()[0])
return 0
def url_getsize(url='https://ultralytics.com/images/bus.jpg'):
# Return downloadable file size in bytes
response = requests.head(url, allow_redirects=True)
return int(response.headers.get('content-length', -1))
def curl_download(url, filename, *, silent: bool = False) -> bool:
"""
Download a file from a url to a filename using curl.
"""
silent_option = 'sS' if silent else '' # silent
proc = subprocess.run([
'curl',
'-#',
f'-{silent_option}L',
url,
'--output',
filename,
'--retry',
'9',
'-C',
'-',])
return proc.returncode == 0
def safe_download(file, url, url2=None, min_bytes=1E0, error_msg=''):
# Attempts to download file from url or url2, checks and removes incomplete downloads < min_bytes
from yolov5.utils.general import LOGGER
file = Path(file)
assert_msg = f"Downloaded file '{file}' does not exist or size is < min_bytes={min_bytes}"
try: # url1
LOGGER.info(f'Downloading {url} to {file}...')
torch.hub.download_url_to_file(url, str(file), progress=LOGGER.level <= logging.INFO)
assert file.exists() and file.stat().st_size > min_bytes, assert_msg # check
except Exception as e: # url2
if file.exists():
file.unlink() # remove partial downloads
LOGGER.info(f'ERROR: {e}\nRe-attempting {url2 or url} to {file}...')
# curl download, retry and resume on fail
curl_download(url2 or url, file)
finally:
if not file.exists() or file.stat().st_size < min_bytes: # check
if file.exists():
file.unlink() # remove partial downloads
LOGGER.info(f'ERROR: {assert_msg}\n{error_msg}')
LOGGER.info('')
def attempt_download(file, repo='ultralytics/yolov5', release='v7.0'):
# Attempt file download from GitHub release assets if not found locally. release = 'latest', 'v7.0', etc.
from yolov5.utils.general import LOGGER
def github_assets(repository, version='latest'):
# Return GitHub repo tag (i.e. 'v7.0') and assets (i.e. ['yolov5s.pt', 'yolov5m.pt', ...])
if version != 'latest':
version = f'tags/{version}' # i.e. tags/v7.0
response = requests.get(f'https://api.github.com/repos/{repository}/releases/{version}').json() # github api
return response['tag_name'], [x['name'] for x in response['assets']] # tag, assets
file = Path(str(file).strip().replace("'", ''))
if not file.exists():
# URL specified
name = Path(urllib.parse.unquote(str(file))).name # decode '%2F' to '/' etc.
if str(file).startswith(('http:/', 'https:/')): # download
url = str(file).replace(':/', '://') # Pathlib turns :// -> :/
file = name.split('?')[0] # parse authentication https://url.com/file.txt?auth...
if Path(file).is_file():
LOGGER.info(f'Found {url} locally at {file}') # file already exists
else:
safe_download(file=file, url=url, min_bytes=1E5)
return file
# GitHub assets
assets = [f'yolov5{size}{suffix}.pt' for size in 'nsmlx' for suffix in ('', '6', '-cls', '-seg')] # default
try:
tag, assets = github_assets(repo, release)
except Exception:
try:
tag, assets = github_assets(repo) # latest release
except Exception:
try:
tag = subprocess.check_output('git tag', shell=True, stderr=subprocess.STDOUT).decode().split()[-1]
except Exception:
tag = release
if name in assets:
file.parent.mkdir(parents=True, exist_ok=True) # make parent dir (if required)
safe_download(file,
url=f'https://github.com/{repo}/releases/download/{tag}/{name}',
min_bytes=1E5,
error_msg=f'{file} missing, try downloading from https://github.com/{repo}/releases/{tag}')
return str(file)
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