man:MANPATH环境变量列表太长(manpath列表太长)

时间:2019-01-04 10:44:24

标签: man

MANPATH的env-vars太长时,我遇到了以下错误的问题:

$> man <any command>
man: manpath list too long

要弄清路径列表太长的时候,我创建了这个小脚本:

#!/bin/bash
export MANPATH=
for i in $(seq 50 10000)
do
    export MANPATH=/usr:$MANPATH
    man -k gcc > /dev/null
    [ $? -ne 0 ] && echo "$i ${#MANPATH}" && exit 0
done

似乎在${#MANPATH}接近500时中断。

man -d也没有提供我可以使用的任何信息...:(

我从没听说过(也没有发现)env-vars中的条目数限制(除了环境变量的最大长度之外,我还差得远)。

是否有针对此的修复程序?最好是非root用户的修复程序;)

我正在运行Debian 9.6。

编辑:这已在上游报告并解决!

1 个答案:

答案 0 :(得分:1)

基于manp.c starting at line 786

        else if (sscanf (bp, "MANDATORY_MANPATH %511s", key) == 1)
            add_mandatory (key);    
        else if (sscanf (bp, "MANPATH_MAP %511s %511s",
             key, cont) == 2) 
            add_manpath_map (key, cont);
        else if ((c = sscanf (bp, "MANDB_MAP %511s %511s",
                      key, cont)) > 0) 
            add_mandb_map (key, cont, c, user);
        else if ((c = sscanf (bp, "DEFINE %511s %511[^\n]",
                      key, cont)) > 0) 
            add_def (key, cont, c, user);
        else if (sscanf (bp, "SECTION %511[^\n]", cont) == 1)
            add_sections (cont, user);
        else if (sscanf (bp, "SECTIONS %511[^\n]", cont) == 1)
            /* Since I keep getting it wrong ... */
...

我想说阈值是511个字符。有趣的是,有一条评论指出应该予以解决。

        /* TODO: would like a (limited) replacement for sscanf()
         * here that allocates its own memory. At that point check
         * everything that sprintf()s manpath et al!
         */ 

参考