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bash脚本执行时锁定在if语句处

tag-icon • tag-icon bash shell-script
bash脚本执行时锁定在if语句处

我试图理解为什么 bash 脚本似乎在某个if语句处停止执行。我在脚本中添加了 echo 语句。

我有第一批叫做make.sh：

#!/bin/bash

export OPENSHIFT_RUNTIME_DIR=${OPENSHIFT_HOMEDIR}/app-root/runtime
export ROOT_DIR=${OPENSHIFT_RUNTIME_DIR}    #CARTRIDGE
export LIB_DIR=${ROOT_DIR}/lib
export CONF_DIR=${OPENSHIFT_REPO_DIR}/conf

export DIST_PHP_VER=5.6.11

pushd ${OPENSHIFT_REPO_DIR}/misc

chmod +x make_php
echo 'before source make_php'
source make_php
echo 'before check_all'
check_all

popd

脚本make_php是：

#!/bin/bash

function install_php() {
    ...
}

function check_php() {
    echo 'entering check php'
    if [[ -x $OPENSHIFT_RUNTIME_DIR/bin/php-cgi ]] ; then
    echo 'entering check php between if'
    if [[ "`$OPENSHIFT_RUNTIME_DIR/bin/php-cgi`" =~ "${DIST_PHP_VER}" ]] ; then
        echo 'leaving check php return 0'
        return 0
    fi
    fi

    echo "Check PHP ${DIST_PHP_VER} Failed. Start installing"
    install_php
}

function check_composer() {

    echo 'entering check composer'
    ...
    echo 'leaving check composer'

}

function check_all() {

    echo 'entering check all'
    check_php
    echo 'after check php'
    check_composer
    echo 'after composer'

}

当我执行时./make.sh，输出是：

before source make_php
entering check all
entering check php
entering check php between if

我没有收到提示，我必须按 CTRL-C

什么可能导致此问题？以及如何解决呢？

更新

当我转到 $OPENSHIFT_RUNTIME_DIR/bin/ 并执行 php-cgi 时，程序锁定...这可以解释这个问题。

答案1

看起来该脚本正在将 php 作为应用程序运行，而不是尝试获取版本号。您应该能够通过将行更改为以下内容来修复它：

if [[ "`$OPENSHIFT_RUNTIME_DIR/bin/php-cgi --version`" =~ "${DIST_PHP_VER}" ]] ; then

该=~测试是正则表达式匹配，是 bash 的一部分。来自重击(1)手册页：

   An  additional  binary operator, =~, is available, with the same prece‐
   dence as == and !=.  When it is used, the string to the  right  of  the
   operator  is  considered  an  extended  regular  expression and matched
   accordingly (as in regex(3)).  The return value  is  0  if  the  string
   matches  the  pattern,  and  1 otherwise.  If the regular expression is
   syntactically incorrect, the conditional expression's return  value  is
   2.   If the shell option nocasematch is enabled, the match is performed
   without regard to the case of alphabetic characters.  Any part  of  the
   pattern  may  be  quoted to force the quoted portion to be matched as a
   string.  Bracket expressions in regular  expressions  must  be  treated
   carefully,  since normal quoting characters lose their meanings between
   brackets.  If the pattern is stored in a shell  variable,  quoting  the
   variable expansion forces the entire pattern to be matched as a string.
   Substrings matched by parenthesized subexpressions within  the  regular
   expression  are  saved in the array variable BASH_REMATCH.  The element
   of BASH_REMATCH with index 0 is the portion of the string matching  the
   entire regular expression.  The element of BASH_REMATCH with index n is
   the portion of the string matching the nth parenthesized subexpression.

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