Add posix_to_nfsv4_acl converter.
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posix_to_nfsv4_acl
Executable file
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posix_to_nfsv4_acl
Executable file
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#!/usr/bin/env python3
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# wanlin.wang
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# 2024/12/14, version 1.0
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# 2024/12/21, version 1.1, add support for Python 3.6.8 and other improvements
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import os
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import subprocess
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import shlex
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# --- POSIX => NFSv4 基本权限映射表 ---
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# 针对 'r', 'w', 'x' 做粗粒度映射到 NFSv4 权限子集。
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# 这里示例，借助alias来简化设置。规则是
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# - file/dir: r -> R , w -> W , x -> X
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# - file: r -> rntcy, w -> watTNcCy, x -> xtcy
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# - dir: r -> rntcy, w -> waDtTNcCy, x -> xtcy
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PERM_MAP = {
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'r': 'R',
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'w': 'W',
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'x': 'X',
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}
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def convert_posix_perm_to_nfs4(posix_perm):
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"""
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将类似 'r-x' 的 POSIX 权限字符串映射为简单的 NFSv4 权限字符串。
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"""
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perms = []
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if 'r' in posix_perm:
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perms.append(PERM_MAP['r'])
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if 'w' in posix_perm:
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perms.append(PERM_MAP['w'])
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if 'x' in posix_perm:
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perms.append(PERM_MAP['x'])
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merged = "".join(perms) # 例如 ['rtncy', 'x'] -> 'rtncyx'
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# 去重保持顺序
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result = "".join(sorted(set(merged), key=merged.index))
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return result
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def apply_mask(posix_perm, mask_perm):
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"""
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把某个条目的 nominal 权限与 mask 做交集，得到实际生效权限 (effective perms)。
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mask_perm & posix_perm 都是三字符形式，如 'rwx', 'r-x', '---'。
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逻辑：如果 mask 里无 'w'，则最终也无 'w'。
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"""
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effective = ''
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for i, c in enumerate(['r','w','x']):
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if c in posix_perm and c in mask_perm:
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effective += c
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else:
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effective += '-'
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return effective
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def parse_getfacl_output(acl_output):
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result = {
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'owner': None,
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'group': None,
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'mask': None, # 普通mask
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'default_mask': None, # 新增: default:mask
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'acl_entries': [],
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'default_acl_entries': [],
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}
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lines = acl_output.strip().split('\n')
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for raw_line in lines:
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line = raw_line.strip()
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# 去掉行内注释
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if '#' in line:
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line = line.split('#', 1)[0].strip()
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if not line:
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continue
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parts = line.split(':')
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if line.startswith('default:'):
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entry_type = parts[1] # user / group / mask / other
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if entry_type == 'mask':
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# default:mask::rwx
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result['default_mask'] = parts[-1] # 'rwx'
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else:
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name = ''
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perm = parts[-1]
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if len(parts) == 4:
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name = parts[2]
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result['default_acl_entries'].append({
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'type': entry_type,
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'name': name,
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'perm': perm
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})
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else:
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entry_type = parts[0]
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if entry_type == 'mask':
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result['mask'] = parts[-1]
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else:
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name = ''
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perm = parts[-1]
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if entry_type in ('user','group') and len(parts) == 3:
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name = parts[1]
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result['acl_entries'].append({
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'type': entry_type,
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'name': name,
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'perm': perm
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})
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return result
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# def build_nfs4_acl_cmd(acl_info, path="/dummy", domain='localdomain'):
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def build_nfs4_ace(acl_info, path="/dummy", domain='localdomain'):
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ace_list = []
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# 普通 mask
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normal_mask = acl_info['mask'] if acl_info['mask'] else 'rwx'
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# default mask
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default_mask = acl_info.get('default_mask', None)
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if not default_mask:
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default_mask = 'rwx'
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# 1) OWNER@
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owner_acl = next((e for e in acl_info['acl_entries']
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if e['type'] == 'user' and e['name'] == ''), None)
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if owner_acl:
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# owner 不受普通mask约束
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eff = apply_mask(owner_acl['perm'], 'rwx')
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else:
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eff = 'rwx'
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ace_list.append(f"A::OWNER@:{convert_posix_perm_to_nfs4(eff)}")
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# 2) user:xxx 或 group:xxx (普通条目)
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for entry in acl_info['acl_entries']:
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if entry['type'] == 'user' and entry['name']:
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eff = apply_mask(entry['perm'], normal_mask)
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nfs4_perm = convert_posix_perm_to_nfs4(eff)
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if nfs4_perm:
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ace_list.append(f"A::{entry['name']}@{domain}:{nfs4_perm}")
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if entry['type'] == 'group' and entry['name']:
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eff = apply_mask(entry['perm'], normal_mask)
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nfs4_perm = convert_posix_perm_to_nfs4(eff)
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if nfs4_perm:
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ace_list.append(f"A:g:{entry['name']}@{domain}:{nfs4_perm}")
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else:
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ace_list.append(f"D:g:{entry['name']}@{domain}:RWXdo")
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# 3) group:: (空组)
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group_acl = next((e for e in acl_info['acl_entries']
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if e['type'] == 'group' and e['name'] == ''), None)
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if group_acl:
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eff = apply_mask(group_acl['perm'], normal_mask)
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g_perm = convert_posix_perm_to_nfs4(eff)
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if g_perm:
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ace_list.append(f"A:g:GROUP@:{g_perm}")
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else:
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ace_list.append(f"D:g:GROUP@:RWXdo")
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# 4) other::
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other_acl = next((e for e in acl_info['acl_entries']
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if e['type'] == 'other'), None)
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if other_acl:
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eff = apply_mask(other_acl['perm'], normal_mask)
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o_perm = convert_posix_perm_to_nfs4(eff)
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if o_perm:
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ace_list.append(f"A::EVERYONE@:{o_perm}")
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else:
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ace_list.append(f"D::EVERYONE@:RWXdo")
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# 5) default: ACL (带继承)
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for def_entry in acl_info['default_acl_entries']:
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entry_type = def_entry['type']
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nominal = def_entry['perm']
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# 应用 default_mask
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eff = apply_mask(nominal, default_mask)
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nfs4_perm = convert_posix_perm_to_nfs4(eff)
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if not nfs4_perm:
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continue
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if entry_type == 'user':
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if def_entry['name'] == '':
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ace_list.append(f"A:fd:OWNER@:{nfs4_perm}")
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else:
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ace_list.append(f"A:fd:{def_entry['name']}@{domain}:{nfs4_perm}")
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elif entry_type == 'group':
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if def_entry['name'] == '':
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ace_list.append(f"A:fdg:GROUP@:{nfs4_perm}")
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else:
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ace_list.append(f"A:fdg:{def_entry['name']}@{domain}:{nfs4_perm}")
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elif entry_type == 'other':
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pass
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return ace_list
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def convert_acl_for_directory(root_dir, new_root_dir, domain='localdomain', max_depth=3, nfs4_cmd_file='nfs4_acl_cmds.txt'):
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"""
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遍历 root_dir 下所有文件和目录，
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读取POSIX ACL并转换为NFSv4 ACL (包含 default: 继承处理, mask限制)
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"""
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for dirpath, dirnames, filenames in os.walk(root_dir):
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# 计算当前目录的深度
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depth = dirpath[len(root_dir):].count(os.sep)
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if depth >= max_depth:
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# 如果当前目录的深度超过了最大深度，则不再递归遍历子目录。适用于大型目录结构，只在最上的几层控制。
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dirnames[:] = []
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all_paths = [dirpath] + [os.path.join(dirpath, f) for f in filenames]
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for p in all_paths:
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try:
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# 获取 POSIX ACL。这里调用subprocess时，用了universal_newlines=True，以便输出是str而不是bytes。text=True也可以用于高于3.7的Python版本。
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completed_proc = subprocess.run(["getfacl", p],
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check=True,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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universal_newlines=True)
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acl_output = completed_proc.stdout
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except subprocess.CalledProcessError as e:
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print(f"Warning: getfacl failed on {p}, error: {e}")
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continue
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acl_info = parse_getfacl_output(acl_output)
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ace_list = build_nfs4_ace(acl_info, p, domain=domain)
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if ace_list:
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new_dir = p.replace(root_dir, new_root_dir)
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nfs4_cmd = f"nfs4_setfacl -s \"{' '.join(shlex.quote(x) for x in ace_list)}\" {new_dir}"
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print(f"\n# Got POSIX ACL from {p}, setting NFSv4 ACL for {new_dir} with command:")
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print(nfs4_cmd)
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with open(nfs4_cmd_file, 'a') as f:
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f.write(f"\n# Directory: {dirpath}\n")
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f.write(nfs4_cmd)
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f.write("\n")
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def main():
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import sys
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if len(sys.argv) < 3:
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print(f"Usage: {sys.argv[0]} <directory> <new_directory> [domain]")
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sys.exit(1)
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root_dir = sys.argv[1]
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new_root_dir = sys.argv[2]
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domain = sys.argv[3] if len(sys.argv) > 3 else 'localdomain'
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if not os.path.isdir(root_dir):
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print(f"Error: {root_dir} is not a valid directory.")
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sys.exit(1)
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convert_acl_for_directory(root_dir, new_root_dir, domain)
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if __name__ == "__main__":
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main()
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