downgrade-annex

#!/bin/bash

set -eu

export PS4='> '
# set -x

function info () {
  echo "INFO: $*"
}

function error() {
  echo "ERROR: $1" >&2
  exit "${2:-1}"
}

function fsck() {
  info "FSCKing"
  git annex fsck --fast -q
}

function check_clean() {
  info "Checking if all clean"
  git diff --quiet --exit-code --ignore-submodules && git diff --exit-code --ignore-submodules --cached --quiet
}


if $(git config --global annex.autoupgraderepository) != false; then
  error "Please disable auto upgrades first"
fi

cd "${1:-.}"

annex_version=$(git annex version | awk -e '/^git-annex version:/{print $3}')
case "$annex_version" in
  5.*|6.*|7.*) info "git-annex $annex_version . Good, proceeding";;
  *) error "git-annex $annex_version . Please downgrade to proceed";;
esac

repo_annex_version=$(git config annex.version)
case "$repo_annex_version" in
  5) echo "you are good - already version $repo_annex_version"; exit 0;;
  8) ;;
  *) error "do not know how to downgrade $repo_annex_version, fix me"
esac

# needs recent annex
# unlocked=( $(git annex find --unlocked) )
unlocked=( $(git grep -l -a --no-textconv --cached '^/annex/objects/' || :) )
if [ "${#unlocked[*]}" -ge 1 ]; then
    error "Found ${#unlocked[*]} unlocked files. Cannot do: ${unlocked[*]}" 2
fi

# Cannot do - needs more recent annex
# fsck
check_clean

git config --remove-section filter.annex || echo "Failed to remove filter.annex, may be gone already"
sed -i -n -e '/filter=annex/d' .git/info/attributes
rm -f .git/hooks/post-checkout .git/hooks/post-merge
rm -rf .git/annex/keysdb .git/annex/fsck .git/annex/export

git config annex.version 5

fsck
check_clean

## Let's do a dummy basic operation test
#echo data > data
#git annex add data
#git commit -m 'sample data' data
#
#fsck
#check_clean

info "DONE, all good"