pull

#!/usr/bin/env bash
# vim: set ft=bash ts=3 sw=3 expandtab:
# Pull shared code from an existing repository.

# The general rule is that individual repos may customize only tasks, not any
# of the other code.  This means that when synchronizing shared code, it's always
# safe to overwrite the run script, util.sh, and all of the command scripts.
#
# For tasks, we pull in only non-customized tasks.  If the source repository
# contains a new task that doesn't already exist here, we will pull it in as
# long as it's not a customized task. A repo can flag a customized task using a
# marker comment "# runscript: customized=true".  If this marker is found in
# first 5 lines of code, then the script is considered customized and will be
# ignored.

if [ $# != 1 ]; then
   echo "usage: pull <source-repo-dir>"
   exit 1
fi

SOURCE_DIR=$(echo "$(cd $(dirname "$1");pwd)/$(basename "$1")") # get the absolute path
TARGET_DIR=$PWD

if [ ! -d "$SOURCE_DIR" ]; then
   echo "Source repository does not exist: $SOURCE_DIR"
   exit 1
fi

if [ ! -f "$SOURCE_DIR/run" ] || [ ! -d "$SOURCE_DIR/.run/commands" ]; then
   echo "Common run script framework not found in repository: $SOURCE_DIR"
   exit 1
fi

echo -n "Synchronizing run script..."
cp -f "$SOURCE_DIR/run" run
echo "done"

echo -n "Synchronizing util.sh script..."
cp -f "$SOURCE_DIR/.run/util.sh" util.sh
echo "done"

echo -n "Synchronizing all commands..."
cp -f "$SOURCE_DIR/.run/commands"/* commands/
echo "done"

echo -n "Synchronizing non-customized tasks..."
cd "$SOURCE_DIR/.run/tasks"
for TASK in *.sh; do
   head -5 $TASK | grep -q "^# runscript: customized=true"
   if [ $? != 0 ]; then
      cp -f $TASK "$TARGET_DIR/tasks"
   fi
done
echo "done"