bash script locked at if statement when executed

Question

I am trying to understand why a bash script seems to stop its execution at an if statement. I have added echo statements in the scripts.

I have a first batch called 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

The make_php script is:

#!/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'
}

When I execute ./make.sh, the output is:

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

and I don't get the prompt back, I have to CTRL-C

What could be causing this issue? And how to solve it?

UPDATE

When I go to $OPENSHIFT_RUNTIME_DIR/bin/ and execute php-cgi, the program locks... This could explain the issue.

• Jérôme Verstrynge: I have not written the script myself, so I am not sure what the original developer's intention was. i am not sure what =~ means. I can't find anything with Google. You might be right.
• Jérôme Verstrynge: @drewbenn I have just added --version and the issue is gone. Thanks. If you create the answer, I'll approve it.

Answer 1

It looks like the script was running php as an application instead of trying to get the version number. You should be able to fix it by changing the line to read:

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

The =~ test is a regular expression match, part of bash. From the bash(1) man page:

 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.

• Jérôme Verstrynge: You mean "$OPENSHIFT_RUNTIME_DIR/bin/php-cgi --version"?