外接设备移除会导致文件共享移除，再次插入时需要重新设置外接设备共享（smb，ftp等）

yjn140

外接设备移除会导致文件共享移除，再次插入时需要重新设置外接设备共享（smb，ftp等）

具体描述

设备环境：物理机，局域网

BUG现象：我的打算是当U盘插入的时候就会自动的共享这个U盘文件，这样子我在局域网的时候就能修改或者查看这些文件，然后并执行相关的这个定时备份。但是如果我把这个U盘拔出来去别的地方拷贝了文件之后，想再插入的时候让他自动继续共享，这个U盘里面的文件就失效了。在系统设置里面是可以设置外部设备共享，但是他必须要勾选。勾选了之后，如果移除这个设备之后，这个勾选就失效了。

出现频率：必现

需求

就是像其他用户反馈的一样，首先加入一个支持外接设备插入时备份的功能，第二个是文件共享对外接设备要有一个记忆功能，可以根据他的那个序列号来进行存储，就是如果同一个序列号的同名外接设备拔出了之后又插入的话仍然执行相关的共享的设置

临时解决办法

为了解决这样子的一个问题，我就去寻找了他SMB和FTP的配置文件，也就是相当于他这个移除的时候会把相关的共享设置的配置文件进行修改，而我写一个Python的程序去监控这个文件，当发现修改的时候就马上把它替换回去，因为他的修改只执行一次，只需要我一直监控这样子，配置文件将一直存在共享，应该是能生效的。

/usr/trim/logs/share_service.log:9055:[27 22:45:29.358] [warning] [1397] [IsMountPoint], path: /vol00/SG_Flash not existed
/usr/trim/logs/share_service.log:9056:[27 22:45:29.358] [warning] [1397]   [smb] clear path: /vol00/SG_Flash true
/usr/trim/logs/share_service.log:9081:[27 22:45:29.382] [warning] [1397] [IsMountPoint], path: /vol00/SG_Flash not existed
/usr/trim/logs/share_service.log:9082:[27 22:45:29.382] [warning] [1397]   [ftp] clear path: /vol00/SG_Flash true

这里可以看出这个文件共享服务会在外部设备移除时移除共享，却不会在外部设备插入时加入共享。

于是有下面的解决办法

smb

在路径/etc/samba/users中，可以看到

ls
1000.share.conf  1001.share.conf

cat 1001.share.conf
[Photos]
        path = /vol1/1001/Photos
        browseable = yes
        available = yes
        writeable = yes
        hide special files = yes
        hide unreadable = yes
        oplocks = yes

[外接存储-SG_Flash]
        path = /vol00/SG_Flash
        browseable = yes
        available = yes
        writeable = yes
        hide special files = yes
        hide unreadable = yes
        oplocks = yes

[学习]
        path = /vol1/1001/学习
        browseable = yes
        available = yes
        writeable = yes
        hide special files = yes
        hide unreadable = yes
        oplocks = yes

当外部设备移除时，对应用户的conf文件就会删除外接存储的相关配置。

于是我们需要在设置中选择开启了对应协议外接存储的共享后，执行一个python监控程序

sudo vim  periodic_check.py

import os
import time
import hashlib
import shutil
import sys

def calculate_md5(file_path):
    """计算文件的 MD5 值"""
    if not os.path.exists(file_path):
        return None
    hasher = hashlib.md5()
    with open(file_path, "rb") as f:
        for chunk in iter(lambda: f.read(4096), b""):
            hasher.update(chunk)
    return hasher.hexdigest()

def backup_file(file_path, backup_path):
    """创建备份文件"""
    if not os.path.exists(backup_path):
        shutil.copy(file_path, backup_path)
        print(f"已创建备份文件：{backup_path}")

def replace_with_backup(file_path, backup_path):
    """用备份文件替换原文件，并将备份文件重命名为原文件名"""
    if os.path.exists(backup_path):
        os.replace(backup_path, file_path)  # 用 .bak 覆盖 .conf，并重命名
        print(f"文件内容发生变化，用备份文件 {backup_path} 替换了原文件，并将其重命名为 {file_path}。")
    else:
        print(f"备份文件 {backup_path} 不存在，无法替换原文件。")

def periodic_check(file_path, interval):
    """每隔一段时间检查配置文件"""
    # 保存上次的 MD5 值
    last_md5 = None
    backup_filename = file_path + ".bak"

    while True:
        print("开始检查配置文件...")
        if os.path.exists(file_path):
            # 如果没有备份文件，创建备份
            backup_file(file_path, backup_filename)

            # 计算当前文件的 MD5 值
            current_md5 = calculate_md5(file_path)

            # 如果 MD5 值不一致（文件被修改），用备份文件替换原文件
            if last_md5 is not None and current_md5 != last_md5:
                print("检测到文件内容变化...")
                replace_with_backup(file_path, backup_filename)

            # 更新最后一次的 MD5 值
            last_md5 = current_md5
        else:
            print(f"文件 {file_path} 不存在，等待下次检查。")

        print(f"检查完成，等待 {interval} 秒后再次检查...")
        time.sleep(interval)

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("用法: python periodic_check.py <文件名>")
        sys.exit(1)

    # 从命令行参数获取文件名
    filename = sys.argv[1]
    periodic_check(filename, 10)

sudo nohup python3 periodic_check.py 1001.share.conf

这样就可以了。但是如果要恢复系统的，就是网页端的控制的话就需要手动的执行一次重启，或者把这个进程先删掉，删掉了之后呢，把bak文件删掉，把1001.share.conf文件里面的关于外接存储的删掉。这样再恢复网页程序控制才不容易出问题！

cat 1001.share.conf
[Photos]
        path = /vol1/1001/Photos
        browseable = yes
        available = yes
        writeable = yes
        hide special files = yes
        hide unreadable = yes
        oplocks = yes


[学习]
        path = /vol1/1001/学习
        browseable = yes
        available = yes
        writeable = yes
        hide special files = yes
        hide unreadable = yes
        oplocks = yes

ftp

这个我还没解决，等我再研究吧。要用它二进制的接口。主要是我怕搞坏

/usr/trim/bin$ ./trim_curlftpfs -h
usage: ./trim_curlftpfs <ftphost> <mountpoint>

CurlFtpFS options:
    -o opt,[opt...]        ftp options
    -v   --verbose         make libcurl print verbose debug
    -h   --help            print help
    -V   --version         print version

FTP options:
    ftpfs_debug         print some debugging information
    transform_symlinks  prepend mountpoint to absolute symlink targets
    disable_epsv        use PASV, without trying EPSV first (default)
    enable_epsv         try EPSV before reverting to PASV
    skip_pasv_ip        skip the IP address for PASV
    ftp_port=STR        use PORT with address instead of PASV
    disable_eprt        use PORT, without trying EPRT first
    ftp_method          [multicwd/singlecwd] Control CWD usage
    custom_list=STR     Command used to list files. Defaults to "LIST -a"
    tcp_nodelay         use the TCP_NODELAY option
    connect_timeout=N   maximum time allowed for connection in seconds
    ssl                 enable SSL/TLS for both control and data connections
    ssl_control         enable SSL/TLS only for control connection
    ssl_try             try SSL/TLS first but connect anyway
    no_verify_hostname  does not verify the hostname (SSL)
    no_verify_peer      does not verify the peer (SSL)
    cert=STR            client certificate file (SSL)
    cert_type=STR       certificate file type (DER/PEM/ENG) (SSL)
    key=STR             private key file name (SSL)
    key_type=STR        private key file type (DER/PEM/ENG) (SSL)
    pass=STR            pass phrase for the private key (SSL)
    engine=STR          crypto engine to use (SSL)
    cacert=STR          file with CA certificates to verify the peer (SSL)
    capath=STR          CA directory to verify peer against (SSL)
    ciphers=STR         SSL ciphers to use (SSL)
    interface=STR       specify network interface/address to use
    krb4=STR            enable krb4 with specified security level
    proxy=STR           use host:port HTTP proxy
    proxytunnel         operate through a HTTP proxy tunnel (using CONNECT)
    proxy_anyauth       pick "any" proxy authentication method
    proxy_basic         use Basic authentication on the proxy
    proxy_digest        use Digest authentication on the proxy
    proxy_ntlm          use NTLM authentication on the proxy
    httpproxy           use a HTTP proxy (default)
    socks4              use a SOCKS4 proxy
    socks5              use a SOCKS5 proxy
    user=STR            set server user and password
    proxy_user=STR      set proxy user and password
    tlsv1               use TLSv1 (SSL)
    sslv3               use SSLv3 (SSL)
    ipv4                resolve name to IPv4 address
    ipv6                resolve name to IPv6 address
    utf8                try to transfer file list with utf-8 encoding
    codepage=STR        set the codepage the server uses
    iocharset=STR       set the charset used by the client

CurlFtpFS cache options:  
    cache=yes|no              enable/disable cache (default: yes)
    cache_timeout=SECS        set timeout for stat, dir, link at once
                              default is 10 seconds
    cache_stat_timeout=SECS   set stat timeout
    cache_dir_timeout=SECS    set dir timeout
    cache_link_timeout=SECS   set link timeout

FUSE options:
    -d   -o debug          enable debug output (implies -f)
    -f                     foreground operation
    -s                     disable multi-threaded operation

    -o allow_other         allow access to other users
    -o allow_root          allow access to root
    -o auto_unmount        auto unmount on process termination
    -o nonempty            allow mounts over non-empty file/dir
    -o default_permissions enable permission checking by kernel
    -o fsname=NAME         set filesystem name
    -o subtype=NAME        set filesystem type
    -o large_read          issue large read requests (2.4 only)
    -o max_read=N          set maximum size of read requests

    -o hard_remove         immediate removal (don't hide files)
    -o use_ino             let filesystem set inode numbers
    -o readdir_ino         try to fill in d_ino in readdir
    -o direct_io           use direct I/O
    -o kernel_cache        cache files in kernel
    -o [no]auto_cache      enable caching based on modification times (off)
    -o umask=M             set file permissions (octal)
    -o uid=N               set file owner
    -o gid=N               set file group
    -o entry_timeout=T     cache timeout for names (1.0s)
    -o negative_timeout=T  cache timeout for deleted names (0.0s)
    -o attr_timeout=T      cache timeout for attributes (1.0s)
    -o ac_attr_timeout=T   auto cache timeout for attributes (attr_timeout)
    -o noforget            never forget cached inodes
    -o remember=T          remember cached inodes for T seconds (0s)
    -o nopath              don't supply path if not necessary
    -o intr                allow requests to be interrupted
    -o intr_signal=NUM     signal to send on interrupt (10)
    -o modules=M1[:M2...]  names of modules to push onto filesystem stack

    -o max_write=N         set maximum size of write requests
    -o max_readahead=N     set maximum readahead
    -o max_background=N    set number of maximum background requests
    -o congestion_threshold=N  set kernel's congestion threshold
    -o async_read          perform reads asynchronously (default)
    -o sync_read           perform reads synchronously
    -o atomic_o_trunc      enable atomic open+truncate support
    -o big_writes          enable larger than 4kB writes
    -o no_remote_lock      disable remote file locking
    -o no_remote_flock     disable remote file locking (BSD)
    -o no_remote_posix_lock disable remove file locking (POSIX)
    -o [no_]splice_write   use splice to write to the fuse device
    -o [no_]splice_move    move data while splicing to the fuse device
    -o [no_]splice_read    use splice to read from the fuse device

Module options:

[iconv]
    -o from_code=CHARSET   original encoding of file names (default: UTF-8)
    -o to_code=CHARSET      new encoding of the file names (default: UTF-8)

[subdir]
    -o subdir=DIR        prepend this directory to all paths (mandatory)
    -o [no]rellinks      transform absolute symlinks to relative

/usr/trim/bin$ ./smbftpd -h

smbftpd (http://www.twbsd.org)

options:
     -D          Running smbftpd as a daemon
     -s file     Set the path of smbftpd.conf
     -v          Print the version of smbftpd
     -h          Print this help message

这个位置/usr/trim/var/share_service/1001的文件ftp.conf文件虽然会变更，但是网页端查询是否挂载又不靠它提示，所以改了也没啥用。

ls
ftp.conf  nfs.conf  smb.conf  webdav.conf

cat ftp.conf 
{"updated":1735358252014,"encoding":"","mode":2,"items":[[],[]],"extended":{"mounted":[],"appShare":[],"external":["/vol00/SG_Flash"]}}

等我再研究或者官方更新吧。说实话感觉这几个协议的配置文件乱七八糟，有点费解。

飞牛技术同学

感谢反馈，外接存储的路径在重新拔插之后，会产生变化
这个我们后续有考虑优化一下