#!/bin/bash
#
# Instead of a quilt workflow, we use a git tree that contains
# all the commits on top of a qemu source tarball.
#
# When updating this package, just either update the git tree
# below (use rebase!) or change the tree path and use your own
#
# That way we can easily rebase against the next stable release
# when it comes.

# !!!!!! WARNING - our use of the sort order of our globbing will
# get the patches out of order once they go over 9999!!!!!!!!!!!

set -e

source ./config.sh

rm -rf $GIT_DIR
rm -rf $CMP_DIR
rm -rf $BUNDLE_DIR
rm -f checkpatch.log
rm -rf checkthese

if [ "$GIT_UPSTREAM_COMMIT_ISH" = "LATEST" ]; then
    # This is just a safety valve in case the above gets edited wrong:
    if ! [ "$GIT_BRANCH" = "master" ]; then
        echo "LATEST implies master branch, please fix configuration"
        exit
    fi
    (cd ${LOCAL_REPO_MAP[0]} && git remote update upstream)
fi

BASE_RE="qemu-[[:digit:]]+(\.[[:digit:]]+){2}(-rc[[:digit:]])?"
EXTRA_RE="\+git\.[[:digit:]]+\.([[:xdigit:]]+)"
SUFFIX_RE="\.tar\.xz"
SIG_SUFFIX_RE="\.tar\.xz\.sig"
QEMU_TARBALL=($(find -maxdepth 1 -type f -regextype posix-extended -regex \
    "\./$BASE_RE($EXTRA_RE)?$SUFFIX_RE" -printf "%f "))
QEMU_TARBALL_SIG=($(find -maxdepth 1 -type f -regextype posix-extended -regex \
    "\./$BASE_RE($EXTRA_RE)?$SIG_SUFFIX_RE" -printf "%f "))

if [ ${#QEMU_TARBALL[@]} -gt 1 ]; then
    echo "Multiple qemu tarballs detected. Please clean up"
    exit
fi
if [ ${#QEMU_TARBALL_SIG[@]} -gt 1 ]; then
    echo "Multiple qemu tarballs signature files detected. Please clean up"
    exit
fi
# It's ok for either of these to be empty when using "LATEST"
OLD_SOURCE_VERSION_AND_EXTRA=$(echo $QEMU_TARBALL 2>/dev/null | head --bytes=-8\
    | cut --bytes=6-)
VERSION_EXTRA=$(echo $OLD_SOURCE_VERSION_AND_EXTRA|awk -F+ '{if ($2) print \
    "+"$2}')
if [ "$OLD_SOURCE_VERSION_AND_EXTRA" = "" ]; then
    echo "Warning: No tarball found"
fi

mkdir -p $BUNDLE_DIR
# This tarball has git bundles stored in a directory structure which mimics the
# submodule locations in the containing git repo. Also at that same dir level
# is a file named repo which contains the one line git repo url (with git:// or
# http(s) prefix). The bundles are named as follows:
# "{path/}{git_sha}.{patch_prefix}.{bundle}", where {path/} isn't present for
# the top (qemu) bundle (ie it's for submodules).

tar xJf bundles.tar.xz -C $BUNDLE_DIR
# !!! The following may be overkill, since it seems that find does do a depth first, which is all we need
BUNDLE_FILES=$(find $BUNDLE_DIR -printf "%P\n"|grep "bundle$")

if [ "$GIT_UPSTREAM_COMMIT_ISH" = "LATEST" ]; then
    if [[ $QEMU_TARBALL =~ $BASE_RE$EXTRA_RE$SUFFIX_RE ]]; then
        OLD_COMMIT_ISH=${BASH_REMATCH[3]}
    else
        #Assume release (or release candidate) tarball with equivalent tag:
        OLD_COMMIT_ISH=$(cd ${LOCAL_REPO_MAP[0]} && git rev-list --abbrev-commit \
            --abbrev=9 -1 v$OLD_SOURCE_VERSION_AND_EXTRA)
    fi
    if [ ${#QEMU_TARBALL_SIG[@]} -ne 0 ]; then
        echo "INFO: Ignoring signature file: $QEMU_TARBALL_SIG"
        QEMU_TARBALL_SIG=
    fi
    NEW_COMMIT_ISH=$(cd ${LOCAL_REPO_MAP[0]} && git rev-parse --short=9 \
        upstream/$GIT_BRANCH)
    NOW_SECONDS=$(date +%s)

    git clone -ls ${LOCAL_REPO_MAP[0]} $GIT_DIR -b $GIT_BRANCH --single-branch &>/dev/null
    if  [ "$OLD_COMMIT_ISH" != "$NEW_COMMIT_ISH" ]; then
        echo "Please wait..."
        (cd $GIT_DIR && git remote add upstream \
        git://git.qemu-project.org/qemu.git &>/dev/null)
        (cd $GIT_DIR && git remote update upstream &>/dev/null)
        (cd $GIT_DIR && git checkout $NEW_COMMIT_ISH &>/dev/null)
        (cd $GIT_DIR && git submodule update --init --recursive &>/dev/null)
        VERSION_EXTRA=+git.$NOW_SECONDS.$NEW_COMMIT_ISH
    fi
    QEMU_VERSION=$(cat $GIT_DIR/VERSION)
    MAJOR_VERSION=$(echo $QEMU_VERSION|awk -F. '{print $1}')
    MINOR_VERSION=$(echo $QEMU_VERSION|awk -F. '{print $2}')
    X=$(echo $QEMU_VERSION|awk -F. '{print $3}')
    # 0 = release, 50 = development cycle, 90..99 equate to release candidates
    if [ "$X" != "0" -a "$X" != "50" ]; then
        if [ "$NEXT_RELEASE_IS_MAJOR" = "0" ]; then
            SOURCE_VERSION=$MAJOR_VERSION.$[$MINOR_VERSION+1].0-rc$[X-90]
        else
            SOURCE_VERSION=$[$MAJOR_VERSION+1].0.0-rc$[X-90]
        fi
    else
        SOURCE_VERSION=$MAJOR_VERSION.$MINOR_VERSION.$X
    fi
    if  [ "$OLD_COMMIT_ISH" != "$NEW_COMMIT_ISH" ]; then
        if (cd ${LOCAL_REPO_MAP[0]} && git describe --exact-match $NEW_COMMIT_ISH \
            &>/dev/null); then
            if [ "$X" = "50" ]; then
                echo "Ignoring non-standard tag"
            else
                # there is no VERSION_EXTRA
                VERSION_EXTRA=
            fi
        fi
        (cd $GIT_DIR/roms/seabios && git describe --tags --long --dirty > \
            .version)
        (cd $GIT_DIR/roms/skiboot && ./make_version.sh > .version)
        echo "Almost there..."
        tar --exclude=.git --transform "s,$GIT_DIR,qemu-$SOURCE_VERSION," \
            -Pcf qemu-$SOURCE_VERSION$VERSION_EXTRA.tar $GIT_DIR
        echo "New tarball created. Attempting rebase..."
        if ! (cd $GIT_DIR && git rebase upstream/$GIT_BRANCH $GIT_BRANCH); then
            echo "rebasing master on upstream/master needs human assistance." \
                "Exiting"
            (cd $GIT_DIR && git rebase --abort)
            rm qemu-$SOURCE_VERSION$VERSION_EXTRA.tar 
            exit
        fi
        echo "WARNING: To rebase, master is being checked out"
        if ! (cd ${LOCAL_REPO_MAP[0]} && git rebase upstream/$GIT_BRANCH \
        $GIT_BRANCH); then
            echo "WARNING: Script error? rebasing master on upstream/master" \
                "succeeded in temp"
            echo "dir but failed in local tree! Please investigate"
            (cd ${LOCAL_REPO_MAP[0]} && git rebase --abort)
            rm qemu-$SOURCE_VERSION$VERSION_EXTRA.tar 
            exit
        fi
        echo "Rebase successful"
        osc rm --force qemu-$OLD_SOURCE_VERSION_AND_EXTRA.tar.xz &>/dev/null ||\
            true
        osc rm --force qemu-$OLD_SOURCE_VERSION_AND_EXTRA.tar.xz.sig \
            &>/dev/null || true
        unset QEMU_TARBALL_SIG
        xz -T 0 qemu-$SOURCE_VERSION$VERSION_EXTRA.tar
        osc add qemu-$SOURCE_VERSION$VERSION_EXTRA.tar.xz 
    fi
    # We're done with GIT_UPSTREAM_COMMIT_ISH carrying the special value LATEST
    GIT_UPSTREAM_COMMIT_ISH=$NEW_COMMIT_ISH
    WRITE_LOG=0
else # not based on LATEST upstream master, rather any upstream commitish
    if [ "$OLD_SOURCE_VERSION_AND_EXTRA" = "" ]; then
        echo "Failure: tarball required which corresponds to commitish:" \
            "$GIT_UPSTREAM_COMMITISH"
        exit
    fi
    if [ -d "${LOCAL_REPO_MAP[0]}" ]; then
        echo "Processing local git tree branch: $GIT_BRANCH, using commitish:"\
            "$GIT_UPSTREAM_COMMIT_ISH"
        if ! (cd ${LOCAL_REPO_MAP[0]} && git show-branch $GIT_BRANCH &>/dev/null)
        then
            echo "Error: Branch $GIT_BRANCH not found - please create a remote"\
                "tracking branch of origin/$GIT_BRANCH"
            exit
        fi
        for entry in ${BUNDLE_FILES[@]}; do
            if [[ $entry =~ ^(.*)[/]*([a-f0-9]{40})[.]bundle$ ]]; then
                SUBDIR=${BASH_REMATCH[1]}
                GITREPO_COMMIT_ISH=${BASH_REMATCH[2]}
            else
                echo "ERROR! BAD BUNDLE CONTENT!"
                exit
            fi
            for (( i=0; i <$REPO_COUNT; i++ )); do
                if [[ "$SUBDIR" = "${PATCH_PATH_MAP[$i]}" ]]; then
		    PATCH_RANGE_INDEX=$i
	            break
                fi
            done

# !!!!! REVIEW WHERE THIS mkdir SHOULD BE HAPPENING (kind of replaces the clone operation)
            mkdir -p $GIT_DIR/$SUBDIR
            git -C $GIT_DIR/$SUBDIR init
            git -C $GIT_DIR/$SUBDIR remote add origin file://$(readlink -f \
                ${LOCAL_REPO_MAP[$PATCH_RANGE_INDEX]})
            git -C $GIT_DIR/$SUBDIR fetch origin $GIT_BRANCH
            git -C $GIT_DIR/$SUBDIR reset --hard $GITREPO_COMMIT_ISH
            git -C $GIT_DIR/$SUBDIR remote add bundle $BUNDLE_DIR/$entry 
	    # depending on how created, the bundle's head is called HEAD or FETCH_HEAD
            #git -C $GIT_DIR/$SUBDIR fetch bundle HEAD
            git -C $GIT_DIR/$SUBDIR fetch bundle FETCH_HEAD
            git -C $GIT_DIR/$SUBDIR format-patch -N --suffix= --no-renames -o $CMP_DIR -k --stat=72 \
                --indent-heuristic --zero-commit --no-signature --full-index \
		--src-prefix=a/$SUBDIR --dst-prefix=b/$SUBDIR \
                --start-number=$(expr $PATCH_RANGE_INDEX \* $PATCH_RANGE) \
                $GITREPO_COMMIT_ISH..FETCH_HEAD > /dev/null
        done

# ( THIS ISNT WORKING - IS OLD HISTORY:)
    else
        echo "Processing $GIT_BRANCH branch of remote git tree, using"\
            "commitish: $GIT_UPSTREAM_COMMIT_ISH"
        echo "(For fast processing, consider establishing a local git tree"\
            "at ${LOCAL_REPO_MAP[0]})"
# NYI - should be able to combine with local case for the most part
    fi
    QEMU_VERSION=$(cat $GIT_DIR/VERSION)
    SOURCE_VERSION=$OLD_SOURCE_VERSION_AND_EXTRA
    NEW_COMMIT_ISH=
    WRITE_LOG=1
fi

rm -rf $GIT_DIR
rm -rf $BUNDLE_DIR

(
    CHANGED_COUNT=0
    UNCHANGED_COUNT=0
    DELETED_COUNT=0
    ADDED_COUNT=0
    TOTAL_COUNT=0

    shopt -s nullglob

    for i in $CMP_DIR/*; do
        # index line isn't consistent, so cut full index to normal line length
        sed -E -i 's/(^index [a-f0-9]{28})[a-f0-9]{12}([.][.][a-f0-9]{28})[a-f0-9]{12}( [0-9]{6}$)/\1\2\3/' $i
	BASENAME=$(basename $i)
        if [ "$FIVE_DIGIT_POTENTIAL" = "1" ]; then
            if [[ $BASENAME =~ [[:digit:]]{4}-.* ]]; then
                BASENAME=0$BASENAME
            fi
	fi
        if [[ "$NUMBERED_PATCHES" = "0" ]]; then
	    KEEP_COUNT=40+4+$FIVE_DIGIT_POTENTIAL+1
        else
	    KEEP_COUNT=40
	fi
        tail -n +2 $i > $CMP_DIR/${BASENAME:0:$KEEP_COUNT}.patch
	rm $i
    done
    if [[ "$NUMBERED_PATCHES" = "0" ]]; then
        for i in [0-9]*.patch; do
            osc rm --force $i
            echo "calling osc rm on $i"
        done
        # we need to make sure that w/out the numbered prefixes, the patchnames are all unique
        mkdir checkdir
        for i in $CMP_DIR/*; do
            BASENAME=$(basename $i)
	    FINALNAME=${BASENAME:4+$FIVE_DIGIT_POTENTIAL+1:40+1+5}
	    if [[ -e checkdir/$FINALNAME ]]; then
	        echo "ERROR! Patch name $FINALNAME is not unique! Please modify patch subject to achieve uniqueness"
	        exit 1
            fi
	    cp $i checkdir/$FINALNAME
        done
        CHECK_DIR=checkdir
	cp $CMP_DIR/*.patch .
    else
        CHECK_DIR=$CMP_DIR
    fi
#step 0, and 0.1 are done above - question remains if the numbered case should use check dir

    rm -f checkthese
    if [ "$FIVE_DIGIT_POTENTIAL" = "0" ]; then
        CHECK_PREFIX="0"
    else
        CHECK_PREFIX="00"
    fi
    for i in $CHECK_DIR/*; do
        BASENAME=$(basename $i)
        if [ -e $BASENAME ]; then
            if cmp -s $i $BASENAME; then
                touch --reference=$BASENAME $i
                rm $BASENAME
                let UNCHANGED_COUNT+=1
            else
                if [ "${BASENAME:0:1+$FIVE_DIGIT_POTENTIAL}" = "$CHECK_PREFIX" ]; then
	            echo "$BASENAME" >> checkthese
                fi
                rm $BASENAME
                let CHANGED_COUNT+=1
                let TOTAL_COUNT+=1
            fi
        else
            echo "  $BASENAME" >> qemu.changes.added
            if [ "${BASENAME:0:1+$FIVE_DIGIT_POTENTIAL}" = "$CHECK_PREFIX" ]; then
	        echo "$BASENAME" >> checkthese
            fi
            let ADDED_COUNT+=1
            let TOTAL_COUNT+=1
        fi
    done
    if [ "$FIVE_DIGIT_POTENTIAL" = "0" ]; then
        NUMBERED_PATCH_RE="^[[:digit:]]{4}-.*[.]patch$"
    else
        NUMBERED_PATCH_RE="^[[:digit:]]{5}-.*[.]patch$"
    fi
#NEXT is #2 in lgorithm
    for i in *.patch; do
	if [[ $i =~ $NUMBERED_PATCH_RE ]]; then
            if [[ "$NUMBERED_PATCHES" = "1" ]]; then
                osc rm --force $i
                echo "calling osc rm on $i"
                echo "  $i" >> qemu.changes.deleted
                let DELETED_COUNT+=1
                let TOTAL_COUNT+=1
	    fi
        else
            osc rm --force $i
            echo "calling osc rm on $i"
            echo "  $i" >> qemu.changes.deleted
            let DELETED_COUNT+=1
            let TOTAL_COUNT+=1
        fi
    done
    mv $CHECK_DIR/* .
    if [ -e qemu.changes.added ]; then
        xargs osc add < qemu.changes.added
        echo "calling osc add on:"; cat qemu.changes.added
    fi

    # NYI do we need this check?
    if [ ! -e checkpatch.pl ]; then
        tar Jxf qemu-$SOURCE_VERSION$VERSION_EXTRA.tar.xz \
        qemu-$SOURCE_VERSION/scripts/checkpatch.pl --strip-components=2
    fi
    if [[ -e checkthese ]]; then
        for i in $(cat checkthese); do
            ./checkpatch.pl --no-tree --terse --no-summary --summary-file \
            --patch $i >> checkpatch.log || true
        done
    fi
    rm -f checkthese
    rm -f checkpatch.pl
    if [ -s checkpatch.log ]; then
        echo "WARNING: Issues reported by qemu patch checker. Please handle" \
            "ERROR items now:"
        cat checkpatch.log
    fi
    rm -f checkpatch.log
    if [ "$TOTAL_COUNT" != "0" -a "$VERSION_EXTRA" != "" -a "$OLD_COMMIT_ISH" =\
        "$NEW_COMMIT_ISH" ]; then
        # Patches changed, so update the version using current time 
        VERSION_EXTRA=+git.$NOW_SECONDS.$OLD_COMMIT_ISH
        osc mv qemu-$OLD_SOURCE_VERSION_AND_EXTRA.tar.xz \
            qemu-$SOURCE_VERSION$VERSION_EXTRA.tar.xz
        osc add qemu-$SOURCE_VERSION$VERSION_EXTRA.tar.xz
    fi

    echo "QEMU version file: $QEMU_VERSION"
    echo "QEMU source version: $SOURCE_VERSION"
    echo "QEMU version extra: $VERSION_EXTRA"

    SEABIOS_VERSION=$(tar JxfO qemu-$SOURCE_VERSION$VERSION_EXTRA.tar.xz \
        qemu-$SOURCE_VERSION/roms/seabios/.version | cut -d '-' -f 2)

    for package in qemu; do
        while IFS= read -r line; do
            if [ "$line" = "PATCH_FILES" ]; then
                for i in [0-9]*-*.patch; do
                    NUM=${i%%-*}
		    DIV=$((10#$NUM/$PATCH_RANGE))
		    REM=$((10#$NUM%$PATCH_RANGE))
                    if [[ "$REM" = "0" ]]; then
                        if [[ "$DIV" = "0" ]]; then
                            echo "# Patches applied in base project:"
                        else
                            echo "# Patches applied in ${PATCH_PATH_MAP[$DIV]}:"
                        fi
                    fi
                    if [[ "$FIVE_DIGIT_POTENTIAL" != "0" ]]; then
                        if [[ "$NUMBERED_PATCHES" = "0" ]]; then
                            PATCH_NUMBER=${i%%-*}
                            echo -e "Patch$NUM:     ${i:${#PATCH_NUMBER}+1:40+1+5}"
		        else
                            echo -e "Patch$NUM:     $i"
                        fi
		    else
                        if [[ "$NUMBERED_PATCHES" = "0" ]]; then
                            PATCH_NUMBER=${i%%-*}
                            echo -e "Patch$NUM:      ${i:${#PATCH_NUMBER}+1:40+1+5}"
		        else
                            echo -e "Patch$NUM:      $i"
                        fi
                    fi
                done
            elif [ "$line" = "PATCH_EXEC" ]; then
                for i in [0-9]*-*.patch; do
		    S=$(grep "^Include-If: " $i) || true
                    NUM=${i%%-*}
                    if [ "$S" != "" ]; then
			echo "${S:12}"
                        echo "%patch$NUM -p1"
                        echo "%endif"
                    else
                        echo "%patch$NUM -p1"
                    fi
                done
            elif [ "$line" = "QEMU_VERSION" ]; then
                echo "%define qemuver $QEMU_VERSION$VERSION_EXTRA"
                echo "%define srcver  $SOURCE_VERSION$VERSION_EXTRA"
                echo "Version:        %qemuver"
            elif [[ "$line" =~ ^Source: ]]; then
                echo "$line"
                if [ ${#QEMU_TARBALL_SIG[@]} -eq 1 ]; then
                    # We assume the signature file corresponds - just add .sig
                    echo "$line.sig"|sed 's/^Source:  /Source99:/'
                fi
            elif [ "$line" = "SEABIOS_VERSION" ]; then
                echo "Version:        $SEABIOS_VERSION"
            else
                echo "$line"
            fi
        done < $package.spec.in > $CMP_DIR/$package.spec
        if cmp -s $package.spec $CMP_DIR/$package.spec; then
            echo "$package.spec unchanged"
        else
            mv $CMP_DIR/$package.spec $package.spec
            echo "$package.spec regenerated"
            let PACKAGE_CHANGED_COUNT+=1
        fi

        if [ "$WRITE_LOG" = "1" ]; then
            # Factory requires all deleted and added patches to be mentioned
            if [ -e qemu.changes.deleted ] || [ -e qemu.changes.added ]; then
                echo "Patch queue updated from ${GIT_TREE} ${GIT_BRANCH}" > \
                    $package.changes.proposed
            fi
            if [ -e qemu.changes.deleted ]; then
                echo "* Patches dropped:" >> $package.changes.proposed
                cat qemu.changes.deleted  >> $package.changes.proposed
            fi
            if [ -e qemu.changes.added ]; then
                echo "* Patches added:" >> $package.changes.proposed
                cat qemu.changes.added  >> $package.changes.proposed
            fi
            if [ -e $package.changes.proposed ]; then
                osc vc --file=$package.changes.proposed $package
                rm -f $package.changes.proposed
            fi
        fi
    done
    if [[ "$NUMBERED_PATCHES" = "0" ]]; then
        rm -f [0-9]*-*.patch
    fi
    if [ -e qemu.changes.deleted ]; then
        rm -f qemu.changes.deleted
    fi
    if [ -e qemu.changes.added ]; then
        rm -f qemu.changes.added
    fi
    echo "git patch summary"
    echo "  unchanged: $UNCHANGED_COUNT"
    echo "    changed: $CHANGED_COUNT"
    echo "    deleted: $DELETED_COUNT"
    echo "      added: $ADDED_COUNT"
)

rm -rf $CMP_DIR
rm -rf checkdir

osc service localrun format_spec_file