Basically its for Compressed Android Rom source for slow internet/limited bandwidth devs.

RomSourceCompressor.sh

ROMNAME=lineage-14.1
LINK=https://github.com/LineageOS/android
BRANCH=cm-14.1
THREAD_COUNT_SYNC=Number of your CPU Threads

echo -e "# Installing necessary packages..."
sudo apt install bc pxz wput
echo -e "# Installed"

echo -e "# Installing repo..."
repo init -u $LINK -b $BRANCH --depth 1 -q
echo -e "# Installed"

echo -e "# Syncing..."
repo sync -c -f -q --force-sync --no-clone-bundle --no-tags --optimized-fetch --prune -j$THREAD_COUNT_SYNC
echo -e "# Synced"

echo -e "# Starting Compression..."
export XZ_OPT=-9e
tar -I pxz -cf - * | split -b 4500M - $ROMNAME.tar.xz.
echo -e "# Compressed"

echo -e "# Uploading..."

echo -e "# Done"