initial commit

configctl

@@ -0,0 +1,68 @@
+#!/usr/bin/env sh
+
+XDG_DATA_HOME="${XDG_DATA_HOME:-$HOME/.local/share}"
+XDG_STATE_HOME="${XDG_STATE_HOME:-$HOME/.local/state}"
+XDG_CONFIG_HOME="${XDG_CONFIG_HOME:-$HOME/.config}"
+
+BASE_CONFIG="$XDG_DATA_HOME/config/base"
+CHANGESET_DIR="$XDG_DATA_HOME/config/changeset"
+MOUNT_POINT="$XDG_CONFIG_HOME"
+
+usage() {
+  SCRIPT_NAME=$(basename $0)
+  echo "Usage: $SCRIPT_NAME <changeset_name> [unmount]"
+  exit 1
+}
+
+if [ $# -lt 1 ]; then
+  usage
+fi
+
+SELECTED="$1"
+CHANGESET="$CHANGESET_DIR/$SELECTED"
+UPPER_DIR="$XDG_STATE_HOME/config/$SELECTED"
+WORKDIR="$XDG_STATE_HOME/config/.work_$SELECTED"
+
+if [ ! -d "$CHANGESET" ]; then
+  echo "'$CHANGESET' not found."
+  exit 1
+fi
+
+if [ ! -d "$UPPER_DIR" ]; then
+  mkdir -p $UPPER_DIR
+fi
+
+if [ "$2" == "unmount" ]; then
+  fusermount -u "$MOUNT_POINT"
+  echo "Unmounted $MOUNT_POINT"
+  exit 0
+fi
+
+# Unmount if already mounted.
+if mountpoint -q "$MOUNT_POINT"; then
+  fusermount -u "$MOUNT_POINT"
+fi
+
+SYSD_DIR="$XDG_CONFIG_HOME/systemd/user"
+SVC_NAME="$SELECTED-automount.service"
+mkdir -p "$SYSD_DIR"
+cat << EOF > "$SYSD_DIR/$SVC_NAME"
+[Unit]
+Description=Mount fuse-overlayfs config
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=fuse-overlayfs -o lowerdir="$BASE_CONFIG:$CHANGESET",upperdir="$UPPER_DIR",workdir="$WORKDIR" "$MOUNT_POINT"
+ExecStop=/usr/bin/fusermount -u ~/.$MOUNT_POINT
+
+[Install]
+WantedBy=default.target
+EOF
+
+mkdir -p "$WORKDIR"
+
+fuse-overlayfs -o lowerdir="$BASE_CONFIG:$CHANGESET",upperdir="$UPPER_DIR",workdir="$WORKDIR" "$MOUNT_POINT"
+
+echo "Mounted $MOUNT_POINT with changeset '$SELECTED'"
+echo "Run 'systemctl --user enable --now $SVC_NAME' to automount this config"