Linux ps 命令导致AOSP编译失败-阿里云开发者社区

Linux ps 命令导致AOSP编译失败

2023-02-11 276

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简介： Linux ps 命令导致AOSP编译失败

平台

Ubuntu 20.04

概述

下载了AOSP代码尝试编译, 谁料出师未捷…

$. build/envsetup.sh 
error: conflicting format options
Usage:
 ps [options]
 Try 'ps --help <simple|list|output|threads|misc|all>'
  or 'ps --help <s|l|o|t|m|a>'
 for additional help text.
For more details see ps(1).
WARNING: Only bash and zsh are supported.
Use of other shell would lead to erroneous results.

原因

这问题来得有点莫名奇妙, 从LOG上看是跟PS命令有关

function validate_current_shell() {
    local current_sh="$(ps -o command -p $$)"
    case "$current_sh" in
        *bash*)
            function check_type() { type -t "$1"; }
            ;;
        *zsh*)
            function check_type() { type "$1"; }
            enable_zsh_completion ;;
        *)
            echo -e "WARNING: Only bash and zsh are supported.\nUse of other shell would lead to erroneous results."
            ;;
    esac
}

导致这个问题, 是因为之前为了方便使用, 用alias重新定义了默认参数:

默认ps命令的输出结果:

$ ps
    PID TTY          TIME CMD
   7504 pts/1    00:00:01 bash
  49715 pts/1    00:00:00 ps

于是个修改了下ps命令:

alias ps='ps -la'

$ ps -la
F S   UID     PID    PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
4 S   125    1395    1393  0  80   0 - 116589 -     tty1     00:00:00 Xorg
0 S   125    1624    1393  0  80   0 -  1324 -      tty1     00:00:00 dbus-run-sessio
0 S   125    1625    1624  0  80   0 -  1882 -      tty1     00:00:00 dbus-daemon
0 S   125    1626    1624  0  80   0 - 140163 -     tty1     00:00:00 gnome-session-b
0 S   125    1630       1  0  80   0 - 76386 -      tty1     00:00:00 at-spi-bus-laun
0 S   125    1635    1630  0  80   0 -  1778 -      tty1     00:00:00 dbus-daemon
0 S   125    1659    1626  0  80   0 - 991315 -     tty1     00:00:03 gnome-shell
0 S   125    1674    1659  0  80   0 - 78491 -      tty1     00:00:00 ibus-daemon
0 S   125    1677    1674  0  80   0 - 59900 -      tty1     00:00:00 ibus-dconf
0 S   125    1680       1  0  80   0 - 47781 -      tty1     00:00:00 ibus-x11
0 S   125    1683       1  0  80   0 - 59895 -      tty1     00:00:00 ibus-portal
0 S   125    1693       1  0  80   0 - 40709 -      tty1     00:00:00 at-spi2-registr
0 S   125    1697       1  0  80   0 - 59668 -      tty1     00:00:00 xdg-permission-
0 S   125    1712       1  0  80   0 - 684168 -     tty1     00:00:00 gjs
0 S   125    1719    1626  0  80   0 - 116964 -     tty1     00:00:00 gsd-sharing
0 S   125    1720    1626  0  80   0 - 84554 -      tty1     00:00:00 gsd-wacom
0 S   125    1723    1626  0  80   0 - 162019 -     tty1     00:00:00 gsd-color
0 S   125    1725    1674  0  80   0 - 41443 -      tty1     00:00:00 ibus-engine-sim
0 S   125    1728    1626  0  80   0 - 103080 -     tty1     00:00:00 gsd-keyboard
0 S   125    1734    1626  0  80   0 - 62823 -      tty1     00:00:00 gsd-print-notif
0 S   125    1735    1626  0  80   0 - 115044 -     tty1     00:00:00 gsd-rfkill
0 S   125    1744    1626  0  80   0 - 79560 -      tty1     00:00:00 gsd-smartcard
0 S   125    1751    1626  0  80   0 - 94174 -      tty1     00:00:00 gsd-datetime
0 S   125    1752    1626  0  80   0 - 223603 -     tty1     00:00:00 gsd-media-keys
0 S   125    1755    1626  0  80   0 - 59646 -      tty1     00:00:00 gsd-screensaver
0 S   125    1756    1626  0  80   0 - 80607 -      tty1     00:00:00 gsd-sound
0 S   125    1757    1626  0  80   0 - 78184 -      tty1     00:00:00 gsd-a11y-settin
0 S   125    1758    1626  0  80   0 - 78700 -      tty1     00:00:09 gsd-housekeepin
0 S   125    1765    1626  0  80   0 - 103342 -     tty1     00:00:01 gsd-power
0 S   125    1800       1  0  80   0 - 86316 -      tty1     00:00:00 gsd-printer
4 S  1000    1966    1964  3  80   0 - 178161 ep_pol tty2    00:57:12 Xorg
0 S  1000    1976    1964  0  80   0 - 47829 poll_s tty2     00:00:00 gnome-session-b
4 R  1000   49731    7504  0  80   0 -  3623 -      pts/1    00:00:00 ps

回到问题本身:

在envsetup.sh中

local current_sh="$(ps -o command -p $$)"

正常情况下, current_sh的值应该是:

$ ps -o command -p $$
COMMAND
bash

$$ Shell本身的PID（ProcessID）

而修改后的命令执行结果是:

$ ps -la -o command -p $$
error: conflicting format options
Usage:
 ps [options]
 Try 'ps --help <simple|list|output|threads|misc|all>'
  or 'ps --help <s|l|o|t|m|a>'
 for additional help text.
For more details see ps(1).

解决的办法很简单, 在PS前, 加上:unalias ps

function validate_current_shell() {
  #取消alais
    unalias ps
    local current_sh="$(ps -o command -p $$)"
    case "$current_sh" in
        *bash*)
            function check_type() { type -t "$1"; }
            ;;
        *zsh*)
            function check_type() { type "$1"; }
            enable_zsh_completion ;;
        *)
            echo -e "WARNING: Only bash and zsh are supported.\nUse of other shell would lead to erroneous results."
            ;;
    esac
}

当然, 最好能判断是否已经重定义了PS, 否则会出现:

$ . build/envsetup.sh 
bash: unalias: ps: not found

于是, 稍微修改下:

function validate_current_shell() {
  #取消alais
    if [[ $(type -t ps) == "alias" ]]; then
        unalias ps
    fi
    local current_sh="$(ps -o command -p $$)"
    case "$current_sh" in
        *bash*)
            function check_type() { type -t "$1"; }
            ;;
        *zsh*)
            function check_type() { type "$1"; }
            enable_zsh_completion ;;
        *)
            echo -e "WARNING: Only bash and zsh are supported.\nUse of other shell would lead to erroneous results."
            ;;
    esac
}