update dotfiles install script

.local/bin/dotfiles-install.sh

@@ -2,20 +2,21 @@
 # this script will install the dotfiles from the target git repository, and back up any conflicting files
 # credit for the basic outline of this script goes to https://www.atlassian.com/git/tutorials/dotfiles
 
+set -eu
+
 DOTFILES_REPO_DIR="$HOME/git/dotfiles"
 DOTFILES_REPO_URL="https://git.blakenorth.net/dotfiles"
 DOTFILES_BACKUP_DIR="$HOME/.dotfiles-backup_$(date +'%Y-%m-%d_%H:%m:%S')"
 
-set -e
-
-printf "\n  Installing dotfiles from $DOTFILES_REPO_URL\n\n"
+printf "\n  Installing dotfiles from %s\n\n" "$DOTFILES_REPO_URL"
 
 # check for the git command and exit if it doesn't exist
 if ! command -v git > /dev/null;then
-   echo 'git is not installed or could not be found in PATH, please install git to proceed'
-   exit 1
+   echo 'Error: git is not installed or could not be found in PATH. Please install git to proceed.' >&2
+   return 1
 fi
 
+mkdir -p "$DOTFILES_REPO_DIR"
 git clone --bare "$DOTFILES_REPO_URL" "$DOTFILES_REPO_DIR" || echo "  Resuming installation"
 
 dot() {
@@ -28,14 +29,19 @@ if ! dot checkout > /dev/null 2>&1; then
    mkdir -p "$DOTFILES_BACKUP_DIR"
 
    # get the list of files that need to be backed up
-   while read -r LINE; do
+   dot checkout 2>&1 \
+      | grep -Po '\t\K.*$' \
+      | while read -r LINE; do
       LINE_DIR="$(dirname "$LINE")" # No file
+      [ "$LINE_DIR" = '.' ] || [ "$LINE_DIR" = '..' ] && continue
       mkdir -p "$DOTFILES_BACKUP_DIR/$LINE_DIR"
       mv "$HOME/$LINE" "$DOTFILES_BACKUP_DIR/$LINE_DIR"
-   done <<< "$(dot checkout 2>&1 | grep -Po '\t\K.*$')"
+   done
+
+   # now that all the files are out of the way, we can do one final checkout
+   dot checkout
 fi
 
-dot checkout
 dot config status.showUntrackedFiles no
 
 printf "\n  Installation complete!\n"