gentoo-x86/eclass/eutils.eclass

# Copyright 1999-2003 Gentoo Technologies, Inc.
# Distributed under the terms of the GNU General Public License v2
# $Header: /home/cvsroot/gentoo-x86/eclass/eutils.eclass,v 1.31 2003/06/05 06:42:32 drobbins Exp $
#
# Author: Martin Schlemmer <azarah@gentoo.org>
#
# This eclass is for general purpose functions that most ebuilds
# have to implement themselves.
#
# NB:  If you add anything, please comment it!

ECLASS=eutils
INHERITED="$INHERITED $ECLASS"

DEPEND="$DEPEND !bootstrap? ( sys-devel/patch )"

DESCRIPTION="Based on the ${ECLASS} eclass"

# This function generate linker scripts in /usr/lib for dynamic
# libs in /lib.  This is to fix linking problems when you have
# the .so in /lib, and the .a in /usr/lib.  What happens is that
# in some cases when linking dynamic, the .a in /usr/lib is used
# instead of the .so in /lib due to gcc/libtool tweaking ld's
# library search path.  This cause many builds to fail.
# See bug #4411 for more info.
#
# To use, simply call:
#
#   gen_usr_ldscript libfoo.so
#
# Note that you should in general use the unversioned name of
# the library, as ldconfig should usually update it correctly
# to point to the latest version of the library present.
#
# <azarah@gentoo.org> (26 Oct 2002)
#
gen_usr_ldscript() {

        # Just make sure it exists
        dodir /usr/lib

        cat > ${D}/usr/lib/$1 <<"END_LDSCRIPT"
/* GNU ld script
   Because Gentoo have critical dynamic libraries
   in /lib, and the static versions in /usr/lib, we
   need to have a "fake" dynamic lib in /usr/lib,
   otherwise we run into linking problems.
   See bug #4411 on http://bugs.gentoo.org/ for
   more info.  */
GROUP ( /lib/libxxx )
END_LDSCRIPT

        dosed "s:libxxx:$1:" /usr/lib/$1

        return 0
}

# Simple function to draw a line consisting of '=' the same length as $*
#
# <azarah@gentoo.org> (11 Nov 2002)
#
draw_line() {
        local i=0
        local str_length=""

        # Handle calls that do not have args, or wc not being installed ...
        if [ -z "$1" -o ! -x "$(which wc 2>/dev/null)" ]
        then
                echo "==============================================================="
                return 0
        fi

        # Get the length of $*
        str_length="$(echo -n "$*" | wc -m)"

        while [ "$i" -lt "${str_length}" ]
        do
                echo -n "="

                i=$((i + 1))
        done

        echo

        return 0
}

# Default directory where patches are located
EPATCH_SOURCE="${WORKDIR}/patch"
# Default extension for patches
EPATCH_SUFFIX="patch.bz2"
# Default options for patch
EPATCH_OPTS=""
# List of patches not to apply.  Not this is only file names,
# and not the full path ..
EPATCH_EXCLUDE=""
# Change the printed message for a single patch.
EPATCH_SINGLE_MSG=""
# Force applying bulk patches even if not following the style:
#
#   ??_${ARCH}_foo.${EPATCH_SUFFIX}
#
EPATCH_FORCE="no"

# This function is for bulk patching, or in theory for just one
# or two patches.
#
# It should work with .bz2, .gz, .zip and plain text patches.
# Currently all patches should be the same format.
#
# You do not have to specify '-p' option to patch, as it will
# try with -p0 to -p5 until it succeed, or fail at -p5.
#
# Above EPATCH_* variables can be used to control various defaults,
# bug they should be left as is to ensure an ebuild can rely on
# them for.
#
# Patches are applied in current directory.
#
# Bulk Patches should preferibly have the form of:
#
#   ??_${ARCH}_foo.${EPATCH_SUFFIX}
#
# For example:
#
#   01_all_misc-fix.patch.bz2
#   02_sparc_another-fix.patch.bz2
#
# This ensures that there are a set order, and you can have ARCH
# specific patches.
#
# If you however give an argument to epatch(), it will treat it as a
# single patch that need to be applied if its a file.  If on the other
# hand its a directory, it will set EPATCH_SOURCE to this.
#
# <azarah@gentoo.org> (10 Nov 2002)
#
epatch() {
        local PIPE_CMD=""
        local STDERR_TARGET="${T}/$$.out"
        local PATCH_TARGET="${T}/$$.patch"
        local PATCH_SUFFIX=""
        local SINGLE_PATCH="no"
        local x=""

        if [ "$#" -gt 1 ]
        then
                eerror "Invalid arguments to epatch()"
                die "Invalid arguments to epatch()"
        fi

        if [ -n "$1" -a -f "$1" ]
        then
                SINGLE_PATCH="yes"

                local EPATCH_SOURCE="$1"
                local EPATCH_SUFFIX="${1##*\.}"

        elif [ -n "$1" -a -d "$1" ]
        then
                # Allow no extension if EPATCH_FORCE=yes ... used by vim for example ...
                if [ "${EPATCH_FORCE}" = "yes" ] && [ -z "${EPATCH_SUFFIX}" ]
                then
                        local EPATCH_SOURCE="$1/*"
                else
                        local EPATCH_SOURCE="$1/*.${EPATCH_SUFFIX}"
                fi
        else
                if [ ! -d ${EPATCH_SOURCE} ]
                then
                        if [ -n "$1" -a "${EPATCH_SOURCE}" = "${WORKDIR}/patch" ]
                        then
                                EPATCH_SOURCE="$1"
                        fi

                        echo
                        eerror "Cannot find \$EPATCH_SOURCE!  Value for \$EPATCH_SOURCE is:"
                        eerror
                        eerror "  ${EPATCH_SOURCE}"
                        echo
                        die "Cannot find \$EPATCH_SOURCE!"
                fi

                local EPATCH_SOURCE="${EPATCH_SOURCE}/*.${EPATCH_SUFFIX}"
        fi

        case ${EPATCH_SUFFIX##*\.} in
                bz2)
                        PIPE_CMD="bzip2 -dc"
                        PATCH_SUFFIX="bz2"
                        ;;
                gz|Z|z)
                        PIPE_CMD="gzip -dc"
                        PATCH_SUFFIX="gz"
                        ;;
                ZIP|zip)
                        PIPE_CMD="unzip -p"
                        PATCH_SUFFIX="zip"
                        ;;
                *)
                        PIPE_CMD="cat"
                        PATCH_SUFFIX="patch"
                        ;;
        esac

        if [ "${SINGLE_PATCH}" = "no" ]
        then
                einfo "Applying various patches (bugfixes/updates)..."
        fi
        for x in ${EPATCH_SOURCE}
        do
                # New ARCH dependant patch naming scheme...
                #
                #   ???_arch_foo.patch
                #
                if [ -f ${x} ] && \
                   ([ "${SINGLE_PATCH}" = "yes" -o "${x/_all_}" != "${x}" -o "`eval echo \$\{x/_${ARCH}_\}`" != "${x}" ] || \
                    [ "${EPATCH_FORCE}" = "yes" ])
                then
                        local count=0
                        local popts="${EPATCH_OPTS}"

                        if [ -n "${EPATCH_EXCLUDE}" ]
                        then
                                if [ "`eval echo \$\{EPATCH_EXCLUDE/${x##*/}\}`" != "${EPATCH_EXCLUDE}" ]
                                then
                                        continue
                                fi
                        fi

                        if [ "${SINGLE_PATCH}" = "yes" ]
                        then
                                if [ -n "${EPATCH_SINGLE_MSG}" ]
                                then
                                        einfo "${EPATCH_SINGLE_MSG}"
                                else
                                        einfo "Applying ${x##*/}..."
                                fi
                        else
                                einfo "  ${x##*/}..."
                        fi

                        echo "***** ${x##*/} *****" > ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}
                        echo >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}

                        # Allow for prefix to differ ... im lazy, so shoot me :/
                        while [ "${count}" -lt 5 ]
                        do
                                # Generate some useful debug info ...
                                draw_line "***** ${x##*/} *****" >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}
                                echo >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}

                                if [ "${PATCH_SUFFIX}" != "patch" ]
                                then
                                        echo -n "PIPE_COMMAND:  " >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}
                                        echo "${PIPE_CMD} ${x} > ${PATCH_TARGET}" >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}
                                else
                                        PATCH_TARGET="${x}"
                                fi

                                echo -n "PATCH COMMAND:  " >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}
                                echo "patch ${popts} -p${count} < ${PATCH_TARGET}" >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}

                                echo >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}
                                draw_line "***** ${x##*/} *****" >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}

                                if [ "${PATCH_SUFFIX}" != "patch" ]
                                then
                                        if ! (${PIPE_CMD} ${x} > ${PATCH_TARGET}) >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/} 2>&1
                                        then
                                                echo
                                                eerror "Could not extract patch!"
                                                #die "Could not extract patch!"
                                                count=5
                                                break
                                        fi
                                fi

                                if (cat ${PATCH_TARGET} | patch ${popts} --dry-run -f -p${count}) >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/} 2>&1
                                then
                                        draw_line "***** ${x##*/} *****" >      ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}.real
                                        echo >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}.real
                                        echo "ACTUALLY APPLYING ${x##*/}..." >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}.real
                                        echo >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}.real
                                        draw_line "***** ${x##*/} *****" >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}.real

                                        cat ${PATCH_TARGET} | patch ${popts} -p${count} >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}.real 2>&1

                                        if [ "$?" -ne 0 ]
                                        then
                                                cat ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}.real >> ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}
                                                echo
                                                eerror "A dry-run of patch command succeeded, but actually"
                                                eerror "applying the patch failed!"
                                                #die "Real world sux compared to the dreamworld!"
                                                count=5
                                        fi

                                        rm -f ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}.real

                                        break
                                fi

                                count=$((count + 1))
                        done

                        if [ "${PATCH_SUFFIX}" != "patch" ]
                        then
                                rm -f ${PATCH_TARGET}
                        fi

                        if [ "${count}" -eq 5 ]
                        then
                                echo
                                eerror "Failed Patch: ${x##*/}!"
                                eerror
                                eerror "Include in your bugreport the contents of:"
                                eerror
                                eerror "  ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}"
                                echo
                                die "Failed Patch: ${x##*/}!"
                        fi

                        rm -f ${STDERR_TARGET%/*}/${x##*/}-${STDERR_TARGET##*/}

                        eend 0
                fi
        done
        if [ "${SINGLE_PATCH}" = "no" ]
        then
                einfo "Done with patching"
        fi
}

# This function return true if we are using the NPTL pthreads
# implementation.
#
# <azarah@gentoo.org> (06 March 2003)
#

have_NPTL() {

        cat > ${T}/test-nptl.c <<-"END"
                #define _XOPEN_SOURCE
                #include <unistd.h>
                #include <stdio.h>

                int main()
                {
                  char buf[255];
                  char *str = buf;

                  confstr(_CS_GNU_LIBPTHREAD_VERSION, str, 255);
                  if (NULL != str) {
                    printf("%s\n", str);
                    if (NULL != strstr(str, "NPTL"))
                      return 0;
                  }

                  return 1;
                }
        END

        einfon "Checking for _CS_GNU_LIBPTHREAD_VERSION support in glibc ... "
        if gcc -o ${T}/nptl ${T}/test-nptl.c &> /dev/null
        then
                echo "yes"
                einfon "Checking what PTHREADS implementation we have ... "
                if ${T}/nptl
                then
                        return 0
                else
                        return 1
                fi
        else
                echo "no"
        fi

        return 1
}

# This function check how many cpu's are present, and then set
# -j in MAKEOPTS accordingly.
#
# Thanks to nall <nall@gentoo.org> for this.
#
get_number_of_jobs() {
        local jobs=0

        if [ ! -r /proc/cpuinfo ]
        then
                return 1
        fi

        # This bit is from H?kan Wessberg <nacka-gentoo@refug.org>, bug #13565.
        if [ "`egrep "^[[:space:]]*MAKEOPTS=" /etc/make.conf | wc -l`" -gt 0 ]
        then
                ADMINOPTS="`egrep "^[[:space:]]*MAKEOPTS=" /etc/make.conf | cut -d= -f2 | sed 's/\"//g'`"
                ADMINPARAM="`echo ${ADMINOPTS} | gawk '{match($0, /-j *[0-9]*/, opt); print opt[0]}'`"
                ADMINPARAM="${ADMINPARAM/-j}"
        fi

        export MAKEOPTS="`echo ${MAKEOPTS} | sed -e 's:-j *[0-9]*::g'`"

        if [ "${ARCH}" = "x86" -o "${ARCH}" = "hppa" -o \
                "${ARCH}" = "arm" -o "${ARCH}" = "mips" ]
        then
                # these archs will always have "[Pp]rocessor"
                jobs="$((`grep -c ^[Pp]rocessor /proc/cpuinfo` * 2))"

        elif [ "${ARCH}" = "sparc" -o "${ARCH}" = "sparc64" ]
        then
                # sparc always has "ncpus active"
                jobs="$((`grep "^ncpus active" /proc/cpuinfo | sed -e "s/^.*: //"` * 2))"

        elif [ "${ARCH}" = "alpha" ]
        then
                # alpha has "cpus active", but only when compiled with SMP
                if [ "`grep -c "^cpus active" /proc/cpuinfo`" -eq 1 ]
                then
                        jobs="$((`grep "^cpus active" /proc/cpuinfo | sed -e "s/^.*: //"` * 2))"
                else
                        jobs=2
                fi

        elif [ "${ARCH}" = "ppc" ]
        then
                # ppc has "processor", but only when compiled with SMP
                if [ "`grep -c "^processor" /proc/cpuinfo`" -eq 1 ]
                then
                        jobs="$((`grep -c ^processor /proc/cpuinfo` * 2))"
                else
                        jobs=2
                fi
        else
                jobs="$((`grep -c ^cpu /proc/cpuinfo` * 2))"
                die "Unknown ARCH -- ${ARCH}!"
        fi

        # Make sure the number is valid ...
        if [ "${jobs}" -lt 1 ]
        then
                jobs=1
        fi

        if [ -n "${ADMINPARAM}" ]
        then
                if [ "${jobs}" -gt "${ADMINPARAM}" ]
                then
                        einfo "Setting make jobs to \"-j${ADMINPARAM}\" to ensure successful merge..."
                        export MAKEOPTS="${MAKEOPTS} -j${ADMINPARAM}"
                else
                        einfo "Setting make jobs to \"-j${jobs}\" to ensure successful merge..."
                        export MAKEOPTS="${MAKEOPTS} -j${jobs}"
                fi
        fi
}

# Simplify/standardize adding users to the system
# vapier@gentoo.org
#
# enewuser(username, uid, shell, homedir, groups, extra options)
#
# Default values if you do not specify any:
# username:     REQUIRED !
# uid:          next available (see useradd(8))
#               note: pass -1 to get default behavior
# shell:        /bin/false
# homedir:      /dev/null
# groups:       none
# extra:        comment of 'added by portage for ${PN}'
enewuser() {
        # get the username
        local euser="$1"; shift
        if [ -z "${euser}" ] ; then
                eerror "No username specified !"
                die "Cannot call enewuser without a username"
        fi
        einfo "Adding user '${euser}' to your system ..."

        # setup a file for testing usernames/groups
        local tmpfile="`mktemp -p ${T}`"
        touch ${tmpfile}
        chown ${euser} ${tmpfile} >& /dev/null
        local realuser="`ls -l ${tmpfile} | awk '{print $3}'`"

        # see if user already exists
        if [ "${euser}" == "${realuser}" ] ; then
                einfo "${euser} already exists on your system :)"
                return 0
        fi

        # options to pass to useradd
        local opts=""

        # handle uid
        local euid="$1"; shift
        if [ ! -z "${euid}" ] && [ "${euid}" != "-1" ] ; then
                if [ ${euid} -gt 0 ] ; then
                        opts="${opts} -u ${euid}"
                else
                        eerror "Userid given but is not greater than 0 !"
                        die "${euid} is not a valid UID"
                fi
        else
                euid="next available"
        fi
        einfo " - Userid: ${euid}"

        # handle shell
        local eshell="$1"; shift
        if [ ! -z "${eshell}" ] ; then
                if [ ! -e ${eshell} ] ; then
                        eerror "A shell was specified but it does not exist !"
                        die "${eshell} does not exist"
                fi
        else
                eshell=/bin/false
        fi
        einfo " - Shell: ${eshell}"
        opts="${opts} -s ${eshell}"

        # handle homedir
        local ehome="$1"; shift
        if [ -z "${ehome}" ] ; then
                ehome=/dev/null
        fi
        einfo " - Home: ${ehome}"
        opts="${opts} -d ${ehome}"

        # handle groups
        local egroups="$1"; shift
        if [ ! -z "${egroups}" ] ; then
                local realgroup
                local oldifs="${IFS}"
                export IFS=","
                for g in ${egroups} ; do
                        chgrp ${g} ${tmpfile} >& /dev/null
                        realgroup="`ls -l ${tmpfile} | awk '{print $4}'`"
                        if [ "${g}" != "${realgroup}" ] ; then
                                eerror "You must add ${g} to the system first"
                                die "${g} is not a valid GID"
                        fi
                done
                export IFS="${oldifs}"
                opts="${opts} -g ${egroups}"
        else
                egroups="(none)"
        fi
        einfo " - Groups: ${egroups}"

        # handle extra and add the user
        local eextra="$@"
        local oldsandbox="${oldsandbox}"
        export SANDBOX_ON="0"
        if [ -z "${eextra}" ] ; then
                useradd ${opts} ${euser} \
                        -c "added by portage for ${PN}" \
                        || die "enewuser failed"
        else
                einfo " - Extra: ${eextra}"
                useradd ${opts} ${euser} ${eextra} \
                        || die "enewuser failed"
        fi
        export SANDBOX_ON="${oldsandbox}"

        if [ ! -e ${ehome} ] && [ ! -e ${D}/${ehome} ] ; then
                einfo " - Creating ${ehome} in ${D}"
                dodir ${ehome}
                fperms ${euser} ${ehome}
        fi
}

# Simplify/standardize adding groups to the system
# vapier@gentoo.org
#
# enewgroup(group, gid)
#
# Default values if you do not specify any:
# groupname:    REQUIRED !
# gid:          next available (see groupadd(8))
# extra:        none
enewgroup() {
        # get the group
        local egroup="$1"; shift
        if [ -z "${egroup}" ] ; then
                eerror "No group specified !"
                die "Cannot call enewgroup without a group"
        fi
        einfo "Adding group '${egroup}' to your system ..."

        # setup a file for testing groupname
        local tmpfile="`mktemp -p ${T}`"
        touch ${tmpfile}
        chgrp ${egroup} ${tmpfile} >& /dev/null
        local realgroup="`ls -l ${tmpfile} | awk '{print $4}'`"

        # see if group already exists
        if [ "${egroup}" == "${realgroup}" ] ; then
                einfo "${egroup} already exists on your system :)"
                return 0
        fi

        # options to pass to useradd
        local opts=""

        # handle gid
        local egid="$1"; shift
        if [ ! -z "${egid}" ] ; then
                if [ ${egid} -gt 0 ] ; then
                        opts="${opts} -g ${egid}"
                else
                        eerror "Groupid given but is not greater than 0 !"
                        die "${egid} is not a valid GID"
                fi
        else
                egid="next available"
        fi
        einfo " - Groupid: ${egid}"

        # handle extra
        local eextra="$@"
        opts="${opts} ${eextra}"

        # add the group
        local oldsandbox="${oldsandbox}"
        export SANDBOX_ON="0"
        groupadd ${opts} ${egroup} || die "enewgroup failed"
        export SANDBOX_ON="${oldsandbox}"
}

# Simple script to replace 'dos2unix' binaries
# vapier@gentoo.org
#
# edos2unix(file, <more files>...)
edos2unix() {
        for f in $@ ; do
                cp ${f} ${T}/edos2unix
                rm -f ${f}
                sed 's/\r$//' ${T}/edos2unix > ${f}
                rm -f ${T}/edos2unix
        done
}

# new convinience patch wapper function to eventually replace epatch(), $PATCHES, $PATCHES1, src_unpack:patch, src_unpack:autopatch and /usr/bin/patch
# Features:
# - bulk patch handling similar to epatch()'s
# - automatic patch level detection like epatch()'s
# - semiautomatic patch uncompression like epatch()'s (may switch to using /usr/bin/file for extra power, instead of just looking at the filename)
# - doesn't have the --dry-run overhead of epatch() - inspects patchfiles manually instead
# - is called from base_src_unpack to handle $PATCHES to avoid defining src_unpack(-) just to use xpatch

# accepts zero or more parameters specifying patchfiles and/or patchdirs

# known issues:
# - only supports unified style patches (does anyone _really_ use anything else?)
# - first file addressed in a patch can't have spaces in its name or in the path mentioned in the patchfile
# (can be easily fixed to be: at least one file addressed in the patch must have no spaces...)
xpatch() {

        debug-print-function $FUNCNAME $*

        local list=""
        local list2=""
        declare -i plevel

        # parse patch sources
        for x in $*; do
                debug-print "$FUNCNAME: parsing parameter $x"
                if [ -f "$x" ]; then
                        list="$list $x"
                elif [ -d "$x" ]; then
                        # handles patchdirs like epatch() for now: no recursion.
                        # patches are sorted by filename, so with an xy_foo naming scheme you'll get the right order.
                        # only patches with _$ARCH_ or _all_ in their filenames are applied.
                        for file in `ls -A $x`; do
                                debug-print "$FUNCNAME:  parsing in subdir: file $file"
                                if [ -f "$x/$file" ] && [ "${file}" != "${file/_all_}" -o "${file}" != "${file/_$ARCH_}" ]; then
                                        list2="$list2 $x/$file"
                                fi
                        done
                        list="`echo $list2 | sort` $list"
                else
                        die "Couldn't find $x"
                fi
        done

        debug-print "$FUNCNAME: final list of patches: $list"

        for x in $list; do
                debug-print "$FUNCNAME: processing $x"
                # deal with compressed files. /usr/bin/file is in the system profile, or should be.
                case "`/usr/bin/file -b $x`" in
                        *gzip*) patchfile="${T}/current.patch"; ungzip -c "$x" > "${patchfile}";;
                        *bzip2*) patchfile="${T}/current.patch"; bunzip2 -c "$x" > "${patchfile}";;
                        *text*) patchfile="$x";;
                        *) die "Could not determine filetype of patch $x";;
                esac
                debug-print "$FUNCNAME: patchfile=$patchfile"

                # determine patchlevel. supports p0 and higher with either $S or $WORKDIR as base.
                target="`/bin/grep '+++' $patchfile | /usr/bin/tail -1`"
                debug-print "$FUNCNAME: raw target=$target"
                # strip target down to the path/filename. NOTE doesn't support filenames/paths with spaces in them :-(
                # remove leading +++
                target="${target/+++ }"
                # ugly, yes. i dunno why doesn't this work instead: target=${target%% *}
                for foo in $target; do target="$foo"; break; done
                # duplicate slashes are discarded by patch wrt the patchlevel. therefore we need to discard them as well
                # to calculate the correct patchlevel.
                while [ "$target" != "${target/\/\/}" ]; do
                        target="${target/\/\//\/}"
                done
                debug-print "$FUNCNAME: stripped target=$target"

                # look for target
                for basedir in "$S" "$WORKDIR" "`pwd`"; do
                        debug-print "$FUNCNAME: looking in basedir=$basedir"
                        cd "$basedir"

                        # try stripping leading directories
                        target2="$target"
                        plevel=0
                        debug-print "$FUNCNAME: trying target2=$target2, plevel=$plevel"
                        while [ ! -f "$target2" ]; do
                                target2="${target2#*/}" # removes piece of target2 upto the first occurence of /
                                plevel=plevel+1
                                debug-print "$FUNCNAME: trying target2=$target2, plevel=$plevel"
                                [ "$target2" == "${target2/\/}" ] && break
                        done
                        test -f "$target2" && break

                        # try stripping filename - needed to support patches creating new files
                        target2="${target%/*}"
                        plevel=0
                        debug-print "$FUNCNAME: trying target2=$target2, plevel=$plevel"
                        while [ ! -d "$target2" ]; do
                                target2="${target2#*/}" # removes piece of target2 upto the first occurence of /
                                plevel=plevel+1
                                debug-print "$FUNCNAME: trying target2=$target2, plevel=$plevel"
                                [ "$target2" == "${target2/\/}" ] && break
                        done
                        test -d "$target2" && break

                done

                test -f "${basedir}/${target2}" || test -d "${basedir}/${target2}" || die "Could not determine patchlevel for $x"
                debug-print "$FUNCNAME: determined plevel=$plevel"
                # do the patching
                ebegin "Applying patch ${x##*/}..."
                /usr/bin/patch -p$plevel < "$patchfile" > /dev/null || die "Failed to apply patch $x"
                eend $?

        done

}