Cygwin mkfifo.nfs hack
Posted by Anonymous on Fri 1st Sep 2023 11:11
raw | new post
modification of post by Anonymous (view diff)

#!/usr/bin/ksh93

#
# mkfifo - mkfifo emulation hack for Cygwin on NFS filesystems
#
# Simple hash full path of FIFO, create FIFO in /tmp
# and use original pathname for softlink to FIFO in /tmp
#
# Script should be chmod +x and then in front of PATH,
# before /usr/bin:/bin where the normal mkfifo resides
#

#
# Written by Roland Mainz <roland.mainz@nrubsig.org>
#

function usage
{
        OPTIND=0
        getopts -a "$0" "${mkfifo_usage}" OPT '-?'
        exit 2
}

typeset -r mkfifo_usage=$'+
[-?\n@(#)\$Id: mkfifo (Roland Mainz) 2023-09-01 \$\n]
[-author?Roland Mainz <roland.mainz@nrubsig.org>]
[+NAME?mkfifo - mkfifo emulation hack for Cygwin nfs]
[+DESCRIPTION?\bshlint\b is a lint for POSIX shell scripts.]
[m:mode?set file permissions.]:[number]

name

[+SEE ALSO?\bshcomp\b(1), \bksh93\b(1)]
'

builtin getconf

while getopts -a "${progname}" "${mkfifo_usage}" OPT ; do
#       printmsg "## OPT=|${OPT}|, OPTARG=|${OPTARG}|"
        case "${OPT}" in
                'm')    typeset fifomode="$OPTARG" ;;
                *)      usage ;;
        esac
done
shift $(( OPTIND-1 ))

(( $# > 0 )) || usage

# reset PATH to the platform's default
export PATH="$(getconf PATH)"

integer retval=0
typeset fifoname
typeset hash
typeset dummy

for fifoname in "$@" ; do
        realpath "$fifoname" | md5sum | read hash dummy
        fifopath="/tmp/nfsfifo_${hash}.fifo"
        rm -f "$fifopath"

        if [[ -v fifomode ]] ; then
                mkfifo -m "$fifomode" "$fifopath"
                (( retval=$? ))
        else
                mkfifo "$fifopath"
                (( retval=$? ))
        fi
        if (( retval == 0 )) ; then
                ln -sf "$fifopath" "$fifoname"
        else
                break
        fi
done

exit $retval
#EOF.