#!/bin/bash
# SPDX-License-Identifier: GPL-2.0-only

#  (kgit-scc), (process a series of .scc files into a full repository)

#  Copyright (c) 2008-2014 Wind River Systems, Inc.

#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License version 2 as
#  published by the Free Software Foundation.

#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#  See the GNU General Public License for more details.

#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

# Example full build invocation:
# 
#  kgit scc -v \
#   -I <path to>/kernel-cache \
#      <path to kernel.org reference git repo> linux
#

# For consistent behaviour with "grep -w"
LC_ALL=C
export LC_ALL

path=`dirname $0`
. $path/kgit
PATH=`cd $path; pwd`:$PATH

# For consistent behaviour with "grep -w"
LC_ALL=C
export LC_ALL

usage()
{
cat <<EOF

 kgit-scc [-e <dir>] [--prep <feat1 feat2 feat3>]
          [-v] [-h] [-j <count>] [-I<dirs to search>] 
          <input> <output>

  A front end to the 'series code compiler (scc)'. It facilitiates
  using scc to build a complete repository or to search/interpret 
  .scc (source) files without actually building a tree.

   -n         :  don't remove existing object files before
                 starting the build
   -e <dir>   :  run executables and put the output in this
                 subdirectory directory of <output>
   --src      :  find all of the source files (.scc) matching the pattern
                 <input> in the passed include directories
   --prep:    : features that should be used to prep a repository build
   --meta-dir <metadir>:  dir with meta content (default "meta")
   --meta-branch <metabr>:  branch to store meta content (default "meta")

   -I <dirs>  : directories to search for .scc files
   -i <dirs>  : directories to serach for source repos
   -j         : jobs. launch at most 'count' jobs when building the
                repository. Default is 10.

   <input> : base repository. if both input and output are passed, then
             a full repository build is triggered.
   <output>: directory in which to place the output of the compilation

   -h: help
   -v: verbose

EOF
}

wait_for_jobs()
{
    local message="$1"
    shift
    local jlist="$@"
    
    if [ -n "$jlist" ]; then
	echo ""
	echo "    $message"
	echo ""

	wait $jlist
    fi
}

search_includes()
{
    search_expr=$1
    parent_leaf=$2

    for dir in $search_dirs; do
	if [ -n "$tgt" ]; then
	    continue
	fi

	found=`find $dir/ -regex "$search_expr"`
	if [ -n "$found" ]; then
	    for f in $found; do
		if [ -n "$tgt" ]; then
		    continue
		fi
		if [ "$parent_leaf" != "any" ]; then
		    x=`grep -e ".*scc_leaf.*" -e ".*define.*KTYPE" $f`
		    if [ -n "$x" ]; then
			echo "$x" | grep -q -w $parent_leaf
			if [ $? -eq 0 ]; then
			    tgt=$f
			fi
		    fi
		else
		    tgt=$f
		fi
	    done
	fi
    done

    echo $tgt
}

# search for the descriptions (.scc files) for a list
# of features.
find_feature_descriptions()
{
    flist=$@
    out_list=""

    for feat in $flist; do
	# exact matches in the search directories for the passed
	# list of features
	f=`search_includes ".*/$feat" any`
	if [ -n "$out_list" ]; then
	    out_list=`echo "$out_list"; echo "$f"`
	else
	    out_list=`echo "$f"`
	fi
    done

    echo "$out_list"
}

get_feat_list()
{
    dir=$1

    flist=$(find $dir -maxdepth 3 -regex '.*[a-zA-Z0-9_]*\.scc$')
    flist=$(echo "$flist" | sort)
    for f in $flist; do
	grep -q ".*define.*KTYPE" $f
	if [ $? -eq 0 ]; then
	    leaf_flist="$leaf_flist $f"
        fi
    done

    echo "$leaf_flist"
}

# command line processing
search_dirs=
vlevel=0
while [ $# -gt 0 ]; do
    case "$1" in
	-v|--v)
		verbose=t
		vlevel=`expr $vlevel + 1`
		;;
	-e|--e)
		exec_dir=$2
		shift
		;;
	--init)
	        init=t
		;;
	--apply)
	        apply=t
		;;
	--compile)
	        compile=t
		;;
	--link)
	        link=t
		;;
	--exec)
	        exec=t
		;;
	--clean)
	        clean=t
		;;
	-j|--jobs)
		jobs=$2
		shift
		;;
	--meta-dir)
		top_meta_dir="$2"
		shift
		;;
	--src)
		src=t
		;;
	--resume)
                resume=t
		;;
	-n|--noclean|--nc)
	        noclean=t
		;;
	-I*|--I*)  if [ "$1" == "-I" ] || [ "$1" == "--I" ]; then
	              x=$2; shift;
	           else
	              x=`echo $1 | sed s%^\-*I%%`
                   fi
                   search_dirs="$search_dirs $x"
		   inc_dirs="$inc_dirs -I $x"
                ;;
        --prep) prep_features=$2
                shift
                ;;
        -i*|--i*)  if [ "$1" == "-i" ] || [ "$1" == "--i" ]; then
	              x=$2; shift;
	           else
	              x=`echo $1 | sed s%^\-*i%%`
                   fi
                   repo_dir="$repo_dir -I $x"
	       ;;
	-h|--h|--help) 
	        usage
                exit;
                ;;
        -*)   
                echo Invalid arg \"$1\".
                usage
                exit
               ;;
	*)
	        break
		;;
    esac
    shift
done

if [ -z "$1" ]; then
    echo no args given.  Try \"-h\".
    usage
    exit
fi

if [ -z "$jobs" ]; then
    jobs=10
fi

use_per_build_obj_dir=t


if [ -z "$init" ] && [ -z "$apply" ] && [ -z "$compile" ] &&
   [ -z "$link" ] && [ -z "$exec" ] && [ -z "$clean" ]; then
    # nothing was indicated, so lets do it all!
    init=t
    compile=t
    link=t
    exec=t
    apply=t
    clean=t
fi

if [ -n "$verbose" ]; then
    vflags="-v"
    if [ $vlevel -eq 2 ]; then
	vflags="-v -v"
    fi
fi

# if just one parm is left, it is output.
# if two are passed, it is input and output and we 
# trigger a full repo build
output=$1
if [ -n "$2" ]; then
    input=$1
    output=$2
    full_build=t
fi

if [ -n "$resume" ]; then
    if [ ! -d $output ]; then
	echo ERROR: asked to resume but output dir \"$output\" does not exist
	exit 1
    fi
fi

if [ -z "$top_meta_dir" ]; then
	top_meta_dir=meta
fi
if [ -z "$meta_branch" ]; then
	meta_branch=meta
fi
meta_dir=$top_meta_dir/cfg/scratch
exec_dir=$meta_dir/obj

if [ -n "$src" ]; then
    pattern=$output

    for dir in $search_dirs; do
	found=`find $dir/ -name "$pattern"`
	if [ -n "$found" ]; then
	    for f in $found; do
		tgt="$tgt $f"
	    done
	fi
    done
    echo "$tgt"

    # flee, we are done
    exit 0
fi

if [ -n "$input" ] && [ ! -d "$input" ]; then
    echo "ERROR. '$input' is not a directory"
    exit
fi
if [ -n "$output" ] && [ ! -d "$output" ]; then
    mkdir "$output"
    if [ ! $? -eq 0 ]; then
	echo "ERROR. '$output' is not a directory"
	exit
    fi
fi

echo ""
echo ""

phase_count=1
if [ -z "$clean" ]; then
    if [ -z "$noclean" ]; then
        # we are allowed to tidy up ...
	echo " phase # $phase_count) cleaning existing object files"
	if [ -d "$exec_dir" ]; then
	    rm -f $exec_dir
	fi
	let phase_count=$phase_count+1
    fi
fi

# create the directory that will hold all of our work
if [ ! -d "$exec_dir" ]; then
    mkdir -p $output/$exec_dir
fi

# find the base version from the kernel-caches
new_inc_dirs=
new_search_dirs=
echo " phase # $phase_count) migrating include dirs"
let phase_count=$phase_count+1

if [ -z "$resume" ]; then
    for dir in $search_dirs; do
	if [ -d $dir ]; then
	    if [ -e $dir/kver ]; then
		base_ver=`cat $dir/kver`
            else
                echo WARNING: no file $dir/kver to set base version
	    fi

	    abs_dir=$(cd $dir; pwd)

	    last_dir=`basename $abs_dir`

 	    echo "   copying $dir to $output/$top_meta_dir/cfg"
 	    (
		mkdir -p $output/$top_meta_dir/cfg/$last_dir
		cd  $output/$top_meta_dir/cfg/$last_dir
 		tar -C $abs_dir --exclude=.git --exclude=docs -cpf - . | tar xpf - .
	   
		captured_dir=`pwd`
            )

	    new_inc_dirs="$new_inc_dirs -I `cd $output/$top_meta_dir/cfg/$last_dir; pwd`"
	    new_search_dirs="$new_search_dirs `cd $output/$top_meta_dir/cfg/$last_dir; pwd`"
        else
            echo WARNING: search dir $dir does not exist
	fi
    done
else
    # resuming
    old_pwd=`pwd`

    if [ ! -d $output/$top_meta_dir/cfg/ ]; then
	echo ERROR: something evil happened: $output/$top_meta_dir/cfg/ is gone
	exit 1
    fi
    cd $output/$top_meta_dir/cfg/
    for d in `ls | grep cache`; do
	new_inc_dirs="$new_inc_dirs -I `cd $d; pwd`"
	new_search_dirs="$new_search_dirs `cd $d; pwd`"
    done
    cd $old_pwd

    if [ -e $d/kver ]; then
	base_ver=`cat $d/kver`
    else
        echo WARNING: no file $d/kver to set base version
    fi
fi
inc_dirs=$new_inc_dirs
search_dirs=$new_search_dirs

find_executables()
{
    old_pwd=`pwd`
    count=0
    exec_total=0
    possible=$(find . -name 'meta-series')
    for d in $possible; do
	executables="$executables $d"
	count=$[$count+1]
	exec_total=$[$exec_total+1]
    done
}

if [ -n "$resume" ]; then
    echo "[INFO] resuming existing tree generation"
    echo "         includes: $inc_dirs"
    echo "         search: $search_dirs"
fi

if [ -n "$init" ]; then
    if [ ! -d $output/.git ]; then
	echo " phase # $phase_count) cloning source repository"

	if [ -z "$base_ver" ]; then
	    echo "ERROR. No base branch version found, exiting"
	    exit 1
	fi

	kgit-init -v $input $base_ver $output
	if [ $? -ne 0 ]; then
	    echo "ERROR. Unable to clone source repository $input"
	    exit 1
	fi

	(
            cd $output;
	    for f in `git ls-files -m`; do
	        git add $f
	    done
	    git commit -s -m "kgit: creating baseline state"
	)
    else
        (
            ii=$(readlink -f $input)
            cd $output
            git checkout master
            git fetch $ii master:master-new
            mb=$(git merge-base master master-new)
            if [ -n "${mb}" ]; then
                git reset --hard ${mb}
                git pull $ii master

                git cat-file -e ${base_ver} 2> /dev/null
                if [ $? -ne 0 ]; then
                    # the commit isn't in the tree, try to fetch it
                    git fetch -n $ii tag ${base_ver}
                fi

                git cat-file -e ${base_ver} 2> /dev/null
                if [ $? -ne 0 ]; then
                    echo "[ERROR]: could not fetch base revision ${base_ver}"
                    exit 1
                fi
                git reset --hard ${base_ver}
                git branch -D master-new
            fi
        )
    fi
    let phase_count=$phase_count+1
fi

if [ -z "$base_ver" ]; then
    for dir in $search_dirs; do
	if [ -d $dir ]; then
	    if [ -e $dir/kver ]; then
		base_ver=`cat $dir/kver`
	    fi
	fi
    done
fi

prep_feature_desc=`find_feature_descriptions $prep_features`

if [ -n "$link" ] || [ -n "$compile" ]; then
    count=1
    executables=""
    old_dir=`pwd`
    exec_total=0
    failed=`mktemp`
    for dir in $search_dirs; do
	if [ -d $dir ]; then
	    echo ""
	    echo ""
	    echo " phase # $phase_count) linking $dir"

	    feat_list=`get_feat_list $dir`
	    total=$(echo "$feat_list" "$prep_feature_desc" | tr ' ' '\n' | wc -l)

	    bops=
	    jcount=0
	    for f in $prep_feature_desc $feat_list; do	    
		if [ $? -eq 0 ]; then
		    outname=`basename $f .scc`

                    if [ ! -z "$BLACKLIST" ]; then
                        echo $BLACKLIST | grep -q "$outname"
                        if [ $? = 0 ]; then
                            echo Skipping $outname, since blacklisted
                            continue
                        fi
                    fi

                    if [ ! -z "$BLACKREGEX" ]; then
                        echo $outname | grep -q "$BLACKREGEX"
                        if [ $? = 0 ]; then
                            echo Skipping $outname, matches blacklisted regex \"$BLACKREGEX\"
                            continue
                        fi
                    fi

                    if [ ! -z "$WHITELIST" ]; then
                        echo $WHITELIST | grep -q "$outname"
                        if [ $? != 0 ]; then
                            echo Skipping $outname, since not explicitly whitelisted
                            continue
                        fi
                    fi

                    if [ ! -z "$WHITEREGEX" ]; then
                        echo $outname | grep -q "$WHITEREGEX"
                        if [ $? != 0 ]; then
                            echo Skipping $outname - does not match whitelisted regex \"$WHITEREGEX\"
                            continue
                        fi
                    fi

		    # this is where we put 'jcount' jobs into the background
		    echo "   [$count/$total] scc -v -o $output/$exec_dir/$outname $inc_dirs --cmds branch,patch $f"
		    (
                        if [ ! -d $output/$exec_dir/$outname ];then
			    mkdir -p $output/$exec_dir/$outname
                        fi

                        # the magic
			scc -o $output/$exec_dir/$outname $inc_dirs --cmds branch,patch $f
			if [ $? -ne 0 ]; then
			    echo "ERROR: could not generate $outname-meta"
			    echo $outname-meta >> $failed
			    exit 1
			fi
                    ) &
		    op=$!
 		    bops="$bops $op"
		    let jcount=$jcount+1

		    if [ "$jcount" -ge "$jobs" ]; then
			wait_for_jobs \
                           "Waiting for $jcount link jobs to complete ..." \
                           $bops
			bops=
			jcount=0
		    fi

		    executables="$executables $exec_dir/$outname/meta-series"
		    let count=$count+1
		    let exec_total=$exec_total+1
		fi
		cd $old_dir
	    done

	    wait_for_jobs \
                "Waiting for series linkage to complete ..." $bops

	    let phase_count=$phase_count+1
	fi
    done
fi

if [ -s "$failed" ]; then
    echo ERROR: aborting due to meta series generation failure:
    cat $failed
    rm -f $failed
    exit 1
fi

if [ -n "$apply" ]; then
    if [ -n "$full_build" ]; then
	echo " phase # $phase_count) running meta series"

	old=`pwd`
	cd $output

	if [ -z "$executables" ]; then
	    find_executables
	fi

	# exec_total was calculuated when we generated all the meta_series
	total=$exec_total
	start_branch=`git branch --no-color | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'`
	count=1
	for e in $executables; do
	    # this will trigger a complete copy of all the config
	    # fragments into the repository. Normal meta series
	    # process will also copy kconf files to the repo, but 
	    # only when a branch is being first populated. If a branch
	    # has already been created AND a meta series has a conditional
	    # configuration, it won't be copied since the branch will
	    # be skipped to speedup execution.
	    if [ -n "$verbose" ]; then
		echo "Applying patches [$count/$total]"
	    fi

	    if [ -n "$verbose" ]; then
		echo "running: kgit-meta $vflags $e"
	    fi
	    kgit-meta $vflags $e

	    if [ $? -ne 0 ]; then
		echo "ERROR. Could not apply meta series $e"
		exit 1
	    fi
	    
	    git checkout $start_branch

	    let count=$count+1
	done
	let phase_count=$phase_count+1
	cd $old

        # make the publish clean with respect to the last
        # meta series used
	rm -f $top_meta_dir/meta-series
    fi
fi

if [ -n "$apply" ]; then
    if [ -z "$noclean" ]; then
        # we are allowed to tidy up ...
	echo " phase # $phase_count) cleaning new object files"
	(
	    cd $output/.git/rebase-apply 2> /dev/null
	    if [ $? -eq 0 ]; then
		rm -rf *
	    fi
	)
	(
	    cd $output/$exec_dir 2> /dev/null
	    if [ $? -eq 0 ]; then
		rm -rf *
		echo "scc object files are placed in this directory" > README
	    fi
	)
	(
	    cd $output/$meta_dir 2> /dev/null
	    if [ $? -eq 0 ]; then
		rm -rf *-meta
	    fi
	)
	let phase_count=$phase_count+1
    fi
fi

if [ -s $meta_dir/refresh ]; then
	echo **********************************************************
	echo "[INFO]" There are patches needing refresh,
	echo               See file $meta_dir/refresh
	echo **********************************************************
fi