Tag: Arch

首先感谢falconindy提供的几个note, 这是我的解决思路的基础:

A few things to note...

1) If you find yourself in a position to recreate the symlink yourself, the link target is [b]usr/lib[/b] and not [b]/usr/lib[/b]. This is an important difference that's only evident in a chroot situation.
2) The linker is an interpreter, just like /bin/bash. If it exists on the system but the /lib symlink is missing/fubar, you can run ELF binaries directly via the linker, e.g. /usr/lib/ld-2.16.so /bin/ln -s ....

我遇到了和litemotiv一样的问题:
清理过/lib, 保证里面的文件都属于 glibc 后再次尝试升级:

(1/2) upgrading glibc                                                                            [########################################################] 100%
error: extract: not overwriting dir with file lib
error: problem occurred while upgrading glibc
call to execv failed (No such file or directory)
error: command failed to execute correctly
error: could not commit transaction
error: failed to commit transaction (transaction aborted)
Errors occurred, no packages were upgraded.

我的问题的特殊点是: 我没有打开一个root权限的命令行, root密码登陆被禁用(所以我无法使用su root), 而且我无法使用上面说的ld-2.16.so去加载sudo(由于sudo本身的安全规则).

于是我琢磨出了下面的方法去修复这个已经挂掉的系统, 希望能帮到遇到类似问题的盆友:

1. 重启, 编辑grub里linux(或kernel)开头的那行, 在尾部添加:

   init=/usr/lib/ld-2.16.so /bin/sh

2. remount文件系统使其可写:

   /usr/lib/ld-2.16.so /bin/mount -o remount,rw /

3. 移除空的(上面的错误会使它是空的) /lib 目录:

   /usr/lib/ld-2.16.so /bin/rmdir /lib

4. 手动修复链接:

   /usr/lib/ld-2.16.so /bin/ln -s usr/lib /lib

5. 按 ctrl-alt-del 重启电脑, 然后用pacman重新安装一次glibc

然后各种东西都恢复正常了, 不需要使用恢复光盘之类的东西 🙂

参考: https://bbs.archlinux.org/viewtopic.php?pid=1126667#p1126667

嗯, 本猫的脚本有多烂大大们都知道的, 所以本文旨在抛砖引玉, 简单介绍利用 pppd hook 和 dhcpcd hook 做到记忆网关, 以及 bash_completion 补全的实现.

保存用的脚本:
/usr/local/bin/froute-save

#!/bin/bash
interface=${interface:-$1}
gateway=${new_routers:-$5}

if [ "$reason" = 'BOUND' ] && ! ([ -z "$interface" ] || [ -z "$gateway" ])
then
    mkdir -p /tmp/froute/
    chmod 755 /tmp/froute
    echo $gateway > /tmp/froute/$interface
    chmod 644 /tmp/froute/$interface
elif ([ "$reason" = 'STOP' ] || [ "$reason" = 'RELEASE' ]) && ! [ -z "$interface
" ]
then
    rm -f /tmp/froute/$interface
fi

嗯..然后首先是pppd的hook, 代码如下:
/etc/ppp/ip-up.d/02-route.sh

reason=BOUND froute-save $1 0 0 0 $5

/etc/ppp/ip-down.d/02-route.sh

reason=RELEASE froute-save $1

然后是dhcpcd的hook.
/etc/dhcpcd.enter-hook

froute-save

如果有用 netcfg 设置静态地址连接, 可以参考如下配置:

POST_UP="env reason=BOUND froute-save $INTERFACE 0 0 0 $GATEWAY || true"
PRE_DOWN="env reason=RELEASE froute-save $INTERFACE || true"

嗯, 现在记忆网关的部分就完成了 ><