osx - Stop git commit in pre-commit hook with exit -

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i'm trying stop git commit continuing pre-commit hook. reading manual, should stop when return exit code other 0. i'm testing see if csscomb command returns error, , if break loop , exit, git commit still continues on entering message via git commit (-a).

i've forked , modified script below https://github.com/filtercake/git-pre-commit-csscomb

#!/bin/bash  # pre-commit hook comb staged .sass , .scss files # save .git/hooks/pre-commit # make executable: chmod +x .git/hooks/pre-commit  # sources:  # http://www.hagenburger.net/blog/using-git-commit-hooks-to-autocompile-sass-to-css.html # http://stackoverflow.com/questions/8470755/git-pre-commit-hook-add-file-into-index/8471009#8471009 # http://stackoverflow.com/questions/592620/how-to-check-if-a-program-exists-from-a-bash-script/677212#677212 # https://gist.github.com/openam/8406343  # check if sass/scss files staged commit  # diff-lines http://stackoverflow.com/a/12179492/3019532 # takes line function diff-lines() {     local path=     local line=     while read;         esc=$'\033'         if [[ $reply =~ ---\ (a/)?.* ]];             continue         elif [[ $reply =~ \+\+\+\ (b/)?([^[:blank:]$esc]+).* ]];             path=${bash_rematch[2]}         elif [[ $reply =~ @@\ -[0-9]+(,[0-9]+)?\ \+([0-9]+)(,[0-9]+)?\ @@.* ]];             line=${bash_rematch[2]}         elif [[ $reply =~ ^($esc\[[0-9;]+m)*([\ +-]) ]];             echo "line $line:$reply"             if [[ ${bash_rematch[2]} != - ]];                 ((line++))             fi         fi     done }  if ! git diff --quiet --cached -- **/*.{sass,scss};              echo ""             echo "--> checked in sass/scss files. lets comb them..."             echo ""              # check if csscomb installed              if hash csscomb 2>/dev/null;                  echo -e "\033[1;32m--> found csscomb\033[0m"                  # todo: check csscomb update once week                  # check if configfile exists                  if [ ! -f ./.csscomb.json ];                     echo "--> no config file, using defaults"                 else                     echo -e "\033[1;32m--> found .csscomb.json\033[0m"                 fi                  echo ""                  # necessary check initial commit                 against="4b825dc642cb6eb9a060e54bf8d69288fbee4904"                 git rev-parse --verify head >/dev/null 2>&1 && against="head"                 exitcode=0                  # (a)dded (c)opied or (m)odified                 # encapsulate loop in {} http://stackoverflow.com/a/13665483/3019532                 git diff-index --cached --full-index --diff-filter=acm $against | \                 {                     while read -r line;                       file_path="$(echo ${line} |cut -d' ' -f6-)"                       extension="${file_path##*.}"                       # extension=${extension,,} # convert lowercase                       regex=""                        # select discouraged words based on extension                        if [ "${extension}" = "sass" ] || [ "${extension}" = "scss" ];                         echo "--> staged sass/scss file: " $file_path                         echo "--> combing..."                         if csscomb $file_path;                             echo "--> adding combed file"                             git add $file_path                             echo "--> done"                         else                             echo "check css file combing errors or alternatively add '-n' git commit bypass hook"                             break                             exit 1 # should stop git commit continuing                         fi                       fi                     done                 }             else                 echo -e "\033[0;31m--> oh noes, css comb not installed. do:"                 echo "--> npm install csscomb -g"                 echo -e "\033[0m"                 echo "--> (you need change , stage sass/scss file again see work on next commit...)"                 echo ""             fi fi  # necessary check initial commit against="4b825dc642cb6eb9a060e54bf8d69288fbee4904" git rev-parse --verify head >/dev/null 2>&1 && against="head" exitcode=0  exit 0 

            git diff-index --cached --full-index --diff-filter=acm $against | \             {                 while read -r line;

here's trouble. multi-command pipe stages run in subshells, , exit loop exits subshell. subshells have own environments, too, can't pass variable settings along them either.

while read -r;         if ! $reply; exit 1; fi done <<eod $(git diff-index --cached --full-index --diff-filter=acm $against) eod

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