root/trunk/freewrt/scripts/update-patches

#!/usr/bin/env bash
# $FreeWRT$
# $MirOS: ports/infrastructure/scripts/update-patches,v 1.5 2006/06/15 19:18:43 tg Exp $
#-
# Copyright (c) 2006
#       Thorsten Glaser <tg@freewrt.org>
#
# Derived from the MirPorts Framework "update-patches" script:
#
# Copyright (c) 2003, 2004, 2005
#       Thorsten "mirabile" Glaser <tg@MirBSD.de>
# Based upon code and idea (c) 2000
#       Marc Espie for the OpenBSD project. All rights reserved.
#
# 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.

[[ -n $BASH_VERSION ]] && shopt -s extglob

do_diff()
{
        local f1=$2/$1
        local f2=$3/$1

        if [[ ! -e $f1 ]]; then
                [[ -d ${f1%/*}/. ]] || mkdir -p ${f1%/*}
                if [[ ! -s $f2 ]]; then
                        cat <<EOF
--- $f1 (non-existant)
+++ $f2 (empty)
@@ -0,0 +0,0 @@
EOF
                        return 0
                fi
                touch -t 197001010000.00 "$f1"
        fi
        diff -adup "$f1" "$f2"
        return $?
}

TRANSFORM='sed s/[.+]/\\\\&/g'
PATCHDIR=$CURDIR/patches
EXTRADIR=$CURDIR/extra

mkdir -p $PATCHDIR

SUBDIST=${WRKDIST##${WRKDIR1}?(/)}
if [[ -n $SUBDIST ]]; then
        mv ${WRKDIR1}.orig/${SUBDIST} ${WRKDIR1}/${SUBDIST}.orig
        D_BASE=${WRKDIR1}
        D_SUB=${SUBDIST}
#       D_SUBP=$D_SUB
        D_SUBP='[^/]*'
        D_CMP=$D_SUBP
else
        # WRKSRC == WRKDIR
        D_BASE=$(dirname ${WRKDIR1})
        D_SUB=$(basename ${WRKDIR1})
        D_SUBP=$D_SUB
        D_CMP=
fi
ORGDIST=${D_BASE}/${D_SUB}.orig

[[ -d $EXTRADIR ]] && \
    (cd $EXTRADIR; find . -print0) | \
    (cd $WRKDIST; pax -rw -0 -d $ORGDIST/) >/dev/null 2>&1

if [[ -e $WRKDIST/.patched-newfiles ]]; then
        touch $ORGDIST/.patched-newfiles
        patch_newfiles=1
else
        patch_newfiles=0
fi

DIFF_FLAGS="-adu -I \"^--- $(echo $D_SUBP.orig/ | $TRANSFORM)@@ .*\""
DIFF_FLAGS="$DIFF_FLAGS -I \"^\+\+\+ $(echo $D_SUBP/ | $TRANSFORM)@@    .*\""

for file in $(cd ${WRKDIST}; find . -type f | sed 's#^\./##'); do
        [[ ! -e $ORGDIST/$file && $patch_newfiles = 0 ]] && continue
        cmp -s "$ORGDIST/$file" "$WRKDIST/$file" && continue
        echo "Processing ${file}..." >&2
        # look in patchdir for an existing patchfile matching this
        cd $PATCHDIR
        for i in $PATCH_LIST; do
                # Ignore non-files, or old backup
                [[ ! -f $i || $i = *@(.orig|.rej|~) ]] && continue

                # Patch found. Is this the one?
                if grep "^[+-][+-][+-] $D_CMP[^/]*/$file        " "$i" >/dev/null; then
                        # Multiple files in the diff?
                        if [ $(grep -c "^--- $D_CMP" "$i") -gt 1 -o \
                            $(grep -c "^+++ $D_CMP" "$i") -gt 1 ]; then
                                echo "Cannot process, $i contains patches" >&2
                                echo "to multiple files! Aborting." >&2
                                echo FAIL
                                [[ -n $SUBDIST ]] && mv \
                                    ${WRKDIR1}/${SUBDIST}.orig \
                                    ${WRKDIR1}.orig/${SUBDIST}
                                exit 0
                        fi
                        # Multiple diffs with this file?
                        let n=0
                        pflst=
                        for j in $PATCH_LIST; do
                                [[ ! -f $j || $j = *@(.orig|.rej|~) ]] && \
                                    continue
                                grep "^[+-][+-][+-] $D_CMP[^/]*/$file   " \
                                    "$j" >/dev/null || continue
                                let n++
                                pflst="$pflst '$j'"
                        done
                        if (( n != 1 )); then
                                echo "Cannot process, file $file" >&2
                                echo "is contained in multiple patches:" >&2
                                echo "$pflst" >&2
                                echo FAIL
                                [[ -n $SUBDIST ]] && mv \
                                    ${WRKDIR1}/${SUBDIST}.orig \
                                    ${WRKDIR1}.orig/${SUBDIST}
                                exit 0
                        fi
                        # No, process this patch

                        accounted="$accounted $i"
                        # found it, copy preamble before comparision
                        ( sed -e "/^--- /,\$d" <$i; \
                          cd $D_BASE && do_diff "$file" "$D_SUB.orig" "$D_SUB" \
                        ) >"$i.new"
                        # did it change ? mark it as changed
                        tfile="$(echo "$file" | $TRANSFORM)"
                        if eval diff "$(echo "${DIFF_FLAGS}" \
                            | sed "s#@@#${tfile}#g")" \
                            "$i" "$i.new" 1>&2; then
                                rm "$i.new"
                        else
                                echo "Patch $i for $file updated" >&2
                                mv "$i" "$i.orig"
                                mv "$i.new" "$i"
                                edit="$edit $i"
                        fi
                        continue 2
                fi
        done

        # Build a sensible name for the new patch file
        patchname=patch-$(echo "$file" | sed -e 's#[/. ]#_#g')
        echo "No patch-* found for $file, creating $patchname" >&2
        ( echo '$Free''WRT$'; \
          cd $D_BASE && do_diff "$file" "$D_SUB.orig" "$D_SUB" \
        ) >$patchname
        edit="$edit $patchname"
        accounted="$accounted $patchname"
done

# Verify all patches accounted for
cd $PATCHDIR
for i in *; do
        [[ ! -f $i || $i = *@(.orig|.rej|~) ]] && continue
        grep '^\\ No newline at end of file' $i >/dev/null \
            && echo "*** Patch $i needs manual intervention" >&2
        [[ $accounted != *@($i)* ]] \
            && echo "*** Patch $i not accounted for" >&2
done

echo $edit
[[ -n $SUBDIST ]] && mv ${WRKDIR1}/${SUBDIST}.orig ${WRKDIR1}.orig/${SUBDIST}
exit 0