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#!/bin/sh
#-
# Copyright © 2014
#  Thorsten “mirabilos” Glaser <t.glaser@tarent.de>
#
# Provided that these terms and disclaimer and all copyright notices
# are retained or reproduced in an accompanying document, permission
# is granted to deal in this work without restriction, including un‐
# limited rights to use, publicly perform, distribute, sell, modify,
# merge, give away, or sublicence.
#
# This work is provided “AS IS” and WITHOUT WARRANTY of any kind, to
# the utmost extent permitted by applicable law, neither express nor
# implied; without malicious intent or gross negligence. In no event
# may a licensor, author or contributor be held liable for indirect,
# direct, other damage, loss, or other issues arising in any way out
# of dealing in the work, even if advised of the possibility of such
# damage or existence of a defect, except proven that it results out
# of said person’s immediate fault when using the work as intended.
#-
# eatmydata utility / wrapper compatible with both 26 and 82 series,
# but only on Debian systems.

usage() {
   echo >&2 "usage: $0 [--] command [arg ...]"
   exit 2
}

# everything in a function to avoid environment pollution
runprog() {
   local cmd me spath saveIFS pathelem tgt rltgt

   # Detect operation mode. If this script is run via a symbolic link,
   # look for the basename in the PATH and execute that.
   if test -L "$0"; then
       # symlink mode
       cmd=$(basename "$0")
   else
       # regular mode
       test x"$1" = x"--" && shift
       test -n "$1" || usage
       cmd=$1
       shift
   fi

   # detect command to run, if necessary
   case $cmd in
   (*/*) ;;
   (*)
       # $cmd does not contain a '/'
       # look in the PATH but avoid loops with myself
       me=$(readlink -f "$0")
       # append :/dev/null both to catch a trailing colon
       # and for an easy abort condition
       spath=$PATH:/dev/null
       saveIFS=$IFS
       IFS=:
       for pathelem in $spath; do
           if test x"$pathelem" = x"/dev/null"; then
               echo >&2 E: eatmydata: \
                   "unable to find '$cmd' in PATH"
               exit 1
           fi
           tgt=${pathelem:-.}/$cmd
           if test -x "$tgt"; then
               # still call whathever is in the path, even if it is a link,
               # as there are programs relying on argv[0] content.
               rltgt=$(readlink -f "$tgt")
               test x"$rltgt" = x"$me" || break
           fi
       done
       IFS=$saveIFS
       cmd=$tgt
       ;;
   esac

   # set up environment
   LD_LIBRARY_PATH=${LD_LIBRARY_PATH:+"$LD_LIBRARY_PATH:"}/usr/lib/libeatmydata
   LD_PRELOAD=${LD_PRELOAD:+"$LD_PRELOAD "}libeatmydata.so
   export LD_LIBRARY_PATH LD_PRELOAD

   # execute the command
   exec "$cmd" "$@"
}

runprog "$@"