ac_prog_httpd

Check for Apache's 'httpd', let script continue if exists & works, pops up error message if not.

Testing of functionality is by checking its compile settings

Besides checking existence, this macro also set these environment variables upon completion:

     HTTPD                    = which httpd
     HTTPD_ROOT               = Apache's root directory, specified when compiled / run with -d option
     HTTPD_SERVER_ROOT        = Directory for Apache's essential files, e.g. access logs / error logs / modules / scripts.
     HTTPD_SERVER_CONFIG_FILE = Full-path of the 'httpd.conf' file
     HTTPD_USER               = Which user that httpd runs as
     HTTPD_GROUP              = Which group that httpd runs as
     HTTPD_DOC_HOME           = Document directory, taken as the first DocumentRoot path found in httpd.conf
     HTTPD_SCRIPT_HOME        = CGI script directory, taken as the first ScriptAlias path found in httpd.conf

AC_DEFUN([AC_PROG_HTTPD],[
AC_REQUIRE([AC_EXEEXT])dnl
AC_PATH_PROG(HTTPD, httpd$EXEEXT, nocommand)
if test "$HTTPD" = nocommand; then
        AC_MSG_ERROR([httpd not found in $PATH])
fi
HTTPD_ROOT=`httpd -V | grep HTTPD_ROOT | sed 's/^.*HTTPD_ROOT[[[:blank:]]]*=[[[:blank:]]]*"\(.*\)"$/\1/'`
HTTPD_SERVER_CONFIG_FILE=`httpd -V | grep SERVER_CONFIG_FILE | sed 's/^.*SERVER_CONFIG_FILE[[[:blank:]]]*=[[[:blank:]]]*"\(.*\)"$/\1/'`
if echo $HTTPD_SERVER_CONFIG_FILE | grep ^[[^/]] > /dev/null; then
        HTTPD_SERVER_CONFIG_FILE=$HTTPD_ROOT/$HTTPD_SERVER_CONFIG_FILE
fi
SERVER_ROOT_PATTERN='^[[[:blank:]]]*ServerRoot[[[:blank:]]][[[:blank:]]]*"\([[^"]]*\)"$'
HTTPD_USER_PATTERN='^User[[[:blank:]]][[[:blank:]]]*\([[^[:blank:]]][[^[:blank:]]]*\)$'
HTTPD_GROUP_PATTERN='^Group[[[:blank:]]][[[:blank:]]]*\([[^[:blank:]]][[^[:blank:]]]*\)$'
DOCUMENT_ROOT_PATTERN='^[[[:blank:]]]*DocumentRoot[[[:blank:]]][[[:blank:]]]*"\([[^"]]*\)"$'
SCRIPT_ALIAS_PATTERN='^[[[:blank:]]]*ScriptAlias[[[:blank:]]][[[:blank:]]]*[[^[:blank:]]][[^[:blank:]]]*[[[:blank:]]][[[:blank:]]]*"\([[^"]]*\)"$'
AC_CHECK_FILE($HTTPD_SERVER_CONFIG_FILE,
        [HTTPD_SERVER_ROOT=`grep $SERVER_ROOT_PATTERN $HTTPD_SERVER_CONFIG_FILE | head -n 1 | sed "s/$SERVER_ROOT_PATTERN/\1/" | sed s/[[/]]$//`;
                HTTPD_USER=`grep $HTTPD_USER_PATTERN $HTTPD_SERVER_CONFIG_FILE | sed "s/$HTTPD_USER_PATTERN/\1/"`;
                HTTPD_GROUP=`grep $HTTPD_GROUP_PATTERN $HTTPD_SERVER_CONFIG_FILE | sed "s/$HTTPD_GROUP_PATTERN/\1/"`;
                HTTPD_DOC_HOME=`grep $DOCUMENT_ROOT_PATTERN $HTTPD_SERVER_CONFIG_FILE | head -n 1 | sed "s/$DOCUMENT_ROOT_PATTERN/\1/" | sed s/[[/]]$//`;
                HTTPD_SCRIPT_HOME=`grep $SCRIPT_ALIAS_PATTERN $HTTPD_SERVER_CONFIG_FILE | head -n 1 | sed "s/$SCRIPT_ALIAS_PATTERN/\1/" | sed s/[[/]]$//`],
        AC_MSG_ERROR([httpd server-config-file (detected as $HTTPD_SERVER_CONFIG_FILE by httpd -V) cannot be found]))dnl
])