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#!/bin/bash

# Set the current target version
# The default is the version detected from TDE core header.
TARGET=${TARGET:-}

# When $SUFFIX = true then the package tarball name will be $package-trinity.
# When $SUFFIX != true then the package tarball name will be trinity-$package.
# Choose the option that satisfies any distro package name rules.
SUFFIX=${SUFFIX:-"true"}

# Setting where the tarball will be created.
# The default is the parent directory (..).
TARBALL_DIR=${TARBALL_DIR:-".."}

# Set compression method
case ${COMPRESS:="xz"} in
  "gzip"*|"pigz"*) TAR_SUFFIX=".gz";;
  "bzip2"|"pbzip2") TAR_SUFFIX=".bz2";;
  "xz"|"pxz") TAR_SUFFIX=".xz";;
esac

# Check git-dir
if [[ ! -e .git ]] ||
   [[ -z "`git rev-parse --git-dir 2>/dev/null`" ]]; then
        echo "This script can only be run from a top level git directory.  Exiting..."
        exit 1
fi

# Check remote branch
branch=`git symbolic-ref -q HEAD | sed "s|^refs/heads/||"`
if [[ -z "$branch" ]]; then
    branch=`git branch --contains HEAD | egrep -v "no branch|detached" | head -n1 | cut -c 3-`
fi
if [[ -z "$branch" ]] ||
   [[ -z "`git rev-parse --symbolic-full-name --remotes=\"*/$branch\"`" ]]; then
        echo "There is not active upstream branch.  Exiting..."
        exit 1
fi

# Get submodule name
REMOTE_URL=$(git config --get remote.origin.url)
if [ "$REMOTE_URL" = "${REMOTE_URL%/tde}" ]; then
    TDEROOT=$( cd `git rev-parse --show-toplevel` &&
               cd .. &&
               cd `git rev-parse --show-toplevel` &&
               pwd )
    SUBROOT=$( cd `git rev-parse --show-toplevel` &&
               pwd )
elif [ -f .gitignore ]; then
    TDEROOT=$( cd `git rev-parse --show-toplevel` &&
               pwd )
    SUBROOT=$PWD
    METAPACKAGE=true
fi
MODULE=${SUBROOT#$TDEROOT/main/}

# Set target version
if [ -z "$TARGET" ]; then
    if [ -f $TDEROOT/main/tdelibs/tdecore/tdeversion.h ]; then
        tdeversionHeader=$TDEROOT/main/tdelibs/tdecore/tdeversion.h
    fi
    if [ -f $TDEROOT/main/tdelibs/kdecore/kdeversion.h ]; then
        tdeversionHeader=$TDEROOT/main/tdelibs/kdecore/kdeversion.h
    fi
    if [ -z "$tdeversionHeader" ]; then
        echo "Cannot find TDE core headers. Exiting."
        exit 1
    fi
    TARGET=`sed -n 's|#define [KT]DE_VERSION_STRING "[^0-9]\?\([^ "]*\).*|\1|p' $tdeversionHeader`
fi

# Check branch by target
if [ "$TARGET" != "${TARGET#3.5.}" ]; then
    if [ "$TARGET" != "${TARGET#3.5.13.}" ]; then
        targetBranch=v3.5.13-sru
    else
        targetBranch=master
    fi
else
    if [ "$TARGET" != "${TARGET%.0}" ]; then
        targetBranch=master
    else
        targetBranch=r${TARGET%.*}.x
    fi
fi
if [ "$branch" != "$targetBranch" ]; then
    echo "Target $TARGET is not valid on $branch branch. Exiting."
    exit 1
fi

# Check submodules
if [[ -e .gitmodules ]]; then
    sed -n "s|^\[submodule \"\([^\"]*\)\"\]$|\1|p" <.gitmodules | \
    while read submodule; do
        if [[ ! -e "$submodule/.git" ]]; then
            git submodule init -- "$submodule"
            git submodule update -- "$submodule"
        fi
    done
fi

# Check status
if [[ ! -z "`git status --porcelain`" ]]; then
        echo "Current tree contains changes that have not been committed.  Exiting..."
        exit 1
fi
if [[ -z "`git branch -r --contains HEAD`" ]]; then
        echo "Current tree contains commits not pushed to the server.  Exiting..."
        exit 1
fi

target_tag=`git tag | grep -F "$TARGET" | head -n1`
if [[ -n "$target_tag" ]] && \
   [[ `git log $target_tag..HEAD | wc -l` -gt 0 ]]; then
        echo "Current tree contains commits beyond target release tag $target_tag.  Exiting..."
        exit 1
fi
if [[ -n "$target_tag" ]] && \
   [[ `git log HEAD..$target_tag | wc -l` -gt 0 ]]; then
        echo "Current tree is behind target release tag $target_tag.  Exiting..."
        exit 1
fi

# Calculate version
tag=`git tag | \
     sed "s|^\([^0-9]\)|\1.|" | sort -t. -k 1,1nr -k 2,2nr -k 3,3nr -k 4,4nr -k 5,5nr | sed "s|^\([^0-9]\)\.|\1|" | \
     while read t; do \
     git branch --contains $t | cut -c 3- | grep -x "$branch" >/dev/null && \
     echo "$t..HEAD" && break; done`

count=`git log $tag --pretty=oneline | wc -l`

if [ "$SUFFIX" = "true" ]; then
    package=$(basename $PWD)-trinity-$TARGET
else
    package=trinity-$(basename $PWD)-$TARGET
fi
if [[ "$count" -gt 0 ]] || [[ -z "$target_tag" ]]; then
    package=$package~pre$count+$(git rev-parse HEAD | cut -c 1-8)
fi

# Create tarball
echo "Package name: $package"
if [ ! -e $TARBALL_DIR/$package.tar$TAR_SUFFIX ]; then
  echo "Creating tarball in $TARBALL_DIR."
  echo "# TDE SCM module information" > .tdescminfo
  echo "Name: $MODULE" >> .tdescminfo
  echo "Revision: $branch-$(git rev-parse HEAD)" >> .tdescminfo
  git log -1 --pretty=format:"DateTime: %cd%n" --date=format:"%m/%d/%Y %H:%M" >> .tdescminfo
  trap "rm $TARBALL_DIR/tar-$$; rm .tdescminfo; exit 1" INT
  find ./ -print0 | LC_ALL=C sort -z | \
  tar c --no-recursion --null -T - \
    --mtime "@$(git log -1 --pretty=format:"%ct")" \
    --owner=root --group=users --exclude .git --exclude .gitmodules \
    --pax-option=exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime \
    --transform "s|^\.\(/\|$\)|$package\1|" ./ | \
  $COMPRESS -9 >$TARBALL_DIR/tar-$$ && \
  mv $TARBALL_DIR/tar-$$ $TARBALL_DIR/$package.tar$TAR_SUFFIX || \
  rm $TARBALL_DIR/tar-$$
  rm .tdescminfo
  [ -f $TARBALL_DIR/$package.tar$TAR_SUFFIX ] && \
  touch -d "@$(git log -1 --pretty=format:"%ct")" $TARBALL_DIR/$package.tar$TAR_SUFFIX
else
  echo "Unchanged tarball in $TARBALL_DIR."
  exit 2
fi