Linux shell 杀死命令，同时仍然根据输出运行

Question

我在 Code::Blocks 中有一组 C++ 项目以及一个构建所有这些项目的脚本。该脚本如下所示:

codeblocks --build --target="release32" project1.cbp
codeblocks --build --target="release32" project2.cbp
codeblocks --build --target="release32" project3.cbp
...

有时，在构建其中一个项目时，Code::Blocks 无法完成该过程并出现错误:*** glibc 检测到 *** codeblocks: 损坏的双链表。这与构建失败无关，这只是代码块中的一个错误，请参见此处: https://bugs.launchpad.net/ubuntu/+source/codeblocks/+bug/764728 或在这里: http://forums.codeblocks.org/index.php?topic=16883.0

我想要做的一个解决方法是在命令仍在运行时解析命令的输出，找到字符串“codeblocks:损坏的双链表”，然后终止代码块以让脚本构建其他项目并完成。

我怎样才能做到这一点？

Answer 1

有点 hacky，但这对你有用吗(bash)？

这只是为了模拟代码块二进制文件(./codeblocks):

$ cat codeblocks
#!/bin/bash

num=$RANDOM
((num %= 2))

case "$num" in
        0)
                echo "codeblocks finished successfully: $*"
                exit 0
                ;;
        1)
                echo "*** glibc detected *** codeblocks: corrupted double-linked list" 1>&2
                while true; do
                        sleep 1
                done
                ;;
esac

这是实际的测试脚本(test.sh):

$ cat test.sh
#!/bin/bash

run_codeblocks()
{
        until (
                subshell_pid=$BASHPID
                echo "trying to run 'codeblocks $*'"
                ./codeblocks "$@" 2>&1 | while read line; do
                        echo "[${line}]"
                        [[ ${line} == *"*** glibc detected ***"* ]] && kill $subshell_pid
                done
                return 0
        ); do
                :
        done
}

echo "running codeblocks ..."
run_codeblocks 1
run_codeblocks 2
run_codeblocks 3
echo "... done"

您将对 codeblocks 的调用包装在子 shell 中，grep 其输出，如果一行与您指定的错误匹配，则会终止该子 shell。基本上就是你所描述的。

$ ./test.sh
running codeblocks ...
trying to run 'codeblocks 1'
[codeblocks finished successfully: 1]
trying to run 'codeblocks 2'
[*** glibc detected *** codeblocks: corrupted double-linked list]
./test.sh: line 4: 29889 Terminated              ( subshell_pid=$BASHPID; echo "trying to run 'codeblocks $*'"; ./codeblocks "$@" 2>&1 | while read line; do
    echo "[${line}]"; [[ ${line} == *"*** glibc detected ***"* ]] && kill $subshell_pid; return 0;
done )
trying to run 'codeblocks 2'
[*** glibc detected *** codeblocks: corrupted double-linked list]
./test.sh: line 4: 29892 Terminated              ( subshell_pid=$BASHPID; echo "trying to run 'codeblocks $*'"; ./codeblocks "$@" 2>&1 | while read line; do
    echo "[${line}]"; [[ ${line} == *"*** glibc detected ***"* ]] && kill $subshell_pid; return 0;
done )
trying to run 'codeblocks 2'
[codeblocks finished successfully: 2]
trying to run 'codeblocks 3'
[*** glibc detected *** codeblocks: corrupted double-linked list]
./test.sh: line 4: 29903 Terminated              ( subshell_pid=$BASHPID; echo "trying to run 'codeblocks $*'"; ./codeblocks "$@" 2>&1 | while read line; do
    echo "[${line}]"; [[ ${line} == *"*** glibc detected ***"* ]] && kill $subshell_pid; return 0;
done )
trying to run 'codeblocks 3'
[codeblocks finished successfully: 3]
... done