#!/usr/bin/python3
# Validate basic syntax of shell script and yaml.

import os
import stat
import subprocess
import yaml

validated=0

def openat(dirfd, name, mode='r'):
    def opener(path, flags):
        return os.open(path, flags, dir_fd=dirfd)
    return open(name, mode, opener=opener)


def validate_shell(rootfd, name):
    subprocess.check_call(['bash', '-n', name], preexec_fn=lambda: os.fchdir(rootfd))
    global validated
    validated +=1


for root, dirs, files, rootfd in os.fwalk('.'):
    # Skip .git, repo, cache, tmp, logs, fedora-comps
    for d in ['.git', 'repo', 'cache', 'tmp', 'logs', 'fedora-comps']:
        if d in dirs:
            dirs.remove(d)
    for name in files:
        if name.endswith(('.yaml', '.yml')):
            print("Validating:", name)
            with open(os.open(name, dir_fd=rootfd, flags=os.O_RDONLY)) as f:
                yaml.safe_load(f)
            result = subprocess.run(['grep', '-RniEv', '^(  )*[a-z#/-]|^$|^#', name], encoding='UTF-8',
                                    preexec_fn=lambda: os.fchdir(rootfd))
            if result.returncode == 0:
                raise Exception("Found likely invalid indentation in YAML file: {}".format(name))
            validated +=1
            continue
        elif name.endswith('.sh'):
            print("Validating:", name)
            validate_shell(rootfd, name)
            continue
        stbuf = os.lstat(name, dir_fd=rootfd)
        if not stat.S_ISREG(stbuf.st_mode):
            continue
        if not stbuf.st_mode & stat.S_IXUSR:
            continue
        mimetype = subprocess.check_output(['file', '-b', '--mime-type', name], encoding='UTF-8',
                                           preexec_fn=lambda: os.fchdir(rootfd)).strip()
        if mimetype == 'text/x-shellscript':
            print("Validating:", name)
            validate_shell(rootfd, name)

print(f"Validated {validated} files")