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dnl @synopsis AC_CHECK_USER
dnl
dnl Check if the specified UNIX user exists, if yes set your
dnl environment variable to that username else unset your environment
dnl variable
dnl
dnl Example:
dnl
dnl AC_CHECK_USER(USER, [gleensalmon])
dnl if test x$USER = xgleensalmon; then
dnl bla..bla..bla..
dnl else
dnl bla..bla..bla..
dnl fi
dnl
dnl Besides checking existence, this macro also set these environment
dnl variables upon completion:
dnl
dnl USER_HOME = home directory of user, written in /etc/passwd
dnl
dnl @category Misc
dnl @author Gleen Salmon <gleensalmon@yahoo.com>
dnl @version 2002-04-11
dnl @license GPLWithACException
AC_DEFUN([AC_CHECK_USER],[
AC_MSG_CHECKING([for user $2])
if grep ^$2: /etc/passwd > /dev/null; then
$1=$2
USER_HOME=`grep ^$2: /etc/passwd | sed "s/^\([[^:]]*:\)\{5\}\([[^:]]*\):[[^:]]*$/\2/"`
AC_MSG_RESULT([yes])
else
unset $1
unset USER_HOME
AC_MSG_RESULT([no])
fi;dnl
])
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