pxe-server/webapp/views/blancco_update.py

"""Updates > Blancco: install a new Blancco Drive Eraser release, test first.

Upload (or pick) the vendor ISO / USB image, stage it as a background job
into WEB_ROOT/blancco/staged/<version>/, boot it from a test entry in the
iPXE menu, then activate it (backup + atomic swap) or roll back. Staging is
a background job (systemd-run) whose progress JSON the page polls; the rest
are renames and small file writes and run inline. Logic lives in
services/blancco_update.py; this module is the route surface.
"""

from flask import (Blueprint, abort, flash, jsonify, redirect, render_template, request,
                   send_file, url_for)

from services import blancco_update as bu
from services.audit import audit

bp = Blueprint("blancco_update", __name__, url_prefix="/updates/blancco")


def _back():
    return redirect(url_for("blancco_update.page"))


@bp.route("/")
def page():
    job = bu.job_state()
    return render_template(
        "updates_blancco.html",
        current=bu.current(),
        staged=bu.staged(),
        backups=bu.backups(),
        sources=bu.sources(),
        job=job,
        job_running=job.get("state") == "running",
        test=bu.test_entry(),
        initrd=bu.initrd_supports_base(),
        upload_dir=bu.upload_dir(),
        source_dirs=bu.source_dirs(),
        server=bu.SERVER,
    )


@bp.route("/status.json")
def status():
    job = bu.job_state()
    return jsonify({k: job.get(k) for k in ("state", "step", "percent", "message", "log",
                                            "version", "source", "started", "finished")})


@bp.route("/upload", methods=["POST"])
def upload():
    """Raw body (the page's fetch upload, name in ?name=) streams straight to
    disk; a plain multipart form works too."""
    f = request.files.get("release_file")
    try:
        if f is not None:
            name, size = bu.save_upload(f.stream, f.filename)
        else:
            name, size = bu.save_upload(request.stream, request.args.get("name", ""),
                                        request.content_length)
    except (ValueError, RuntimeError, OSError) as ex:
        if f is None:
            return jsonify({"ok": False, "error": str(ex)}), 400
        flash(f"Upload failed: {ex}", "danger")
        return _back()
    audit("BLANCCO_UPLOAD", f"{name} ({size} bytes)")
    if f is None:
        return jsonify({"ok": True, "name": name, "size": size})
    flash(f"Uploaded {name}.", "success")
    return _back()


@bp.route("/stage", methods=["POST"])
def stage():
    key, _, name = request.form.get("source", "").partition(":")
    try:
        path = bu.resolve_source(key, name)
        bu.start_stage(path)
    except (ValueError, RuntimeError, OSError) as ex:
        flash(f"Staging not started: {ex}", "danger")
        return _back()
    audit("BLANCCO_STAGE", path)
    flash(f"Staging {name}. This takes a minute or two; the page follows the job.", "info")
    return _back()


@bp.route("/cancel", methods=["POST"])
def cancel():
    bu.cancel_stage()
    audit("BLANCCO_STAGE_CANCEL", "")
    flash("Staging cancelled; partial files removed.", "warning")
    return _back()


@bp.route("/prefs/<version>", methods=["POST"])
def merged_prefs(version):
    f = request.files.get("prefs_file")
    if not f or not f.filename:
        flash("Choose the merged preferences.xml first.", "danger")
        return _back()
    try:
        meta = bu.save_merged_prefs(version, f.read(4 << 20))
    except bu.StageBlocked as ex:
        flash(str(ex), "danger")
        return _back()
    except (ValueError, RuntimeError, OSError) as ex:
        flash(f"Preferences not accepted: {ex}", "danger")
        return _back()
    audit("BLANCCO_PREFS_MERGE", f"{version} preferences {meta.get('prefs_version')}")
    flash(f"Merged preferences accepted; Blancco {version} is staged and ready to test. "
          "Commit the same file to playbook/blancco-preferences.xml so a playbook run "
          "does not put the old one back.", "success")
    return _back()


@bp.route("/vendor-prefs/<version>.xml")
def vendor_prefs(version):
    try:
        path = bu.vendor_prefs_file(version)
    except ValueError:
        abort(404)
    if not path:
        abort(404)
    return send_file(path, mimetype="application/xml", as_attachment=True,
                     download_name=f"vendor-preferences-{version}.xml")


@bp.route("/test/<version>", methods=["POST"])
def test_add(version):
    try:
        backup = bu.add_test_entry(version)
    except (ValueError, RuntimeError, OSError) as ex:
        flash(f"Test entry not added: {ex}", "danger")
        return _back()
    audit("BLANCCO_TEST_ENTRY_ADD", f"{version} (menu backup {backup})")
    flash(f"Boot menu now has \"Blancco Drive Eraser {version} (STAGED - TEST)\". "
          "PXE boot a test machine and pick it.", "success")
    return _back()


@bp.route("/test/remove", methods=["POST"])
def test_remove():
    try:
        backup = bu.remove_test_entry()
    except (RuntimeError, OSError) as ex:
        flash(f"Test entry not removed: {ex}", "danger")
        return _back()
    audit("BLANCCO_TEST_ENTRY_REMOVE", f"menu backup {backup}" if backup else "none present")
    flash("Test entry removed from the boot menu." if backup else "No test entry in the menu.", "success")
    return _back()


@bp.route("/activate/<version>", methods=["POST"])
def activate(version):
    try:
        backup, files, removed = bu.activate(version)
    except (ValueError, RuntimeError, OSError) as ex:
        flash(f"Not activated: {ex}", "danger")
        return _back()
    audit("BLANCCO_ACTIVATE", f"{version}; previous release saved in {backup}")
    flash(f"Blancco {version} is live ({len(files)} files swapped). The previous release is in "
          f"{backup}." + (" The test menu entry was removed." if removed is True else ""), "success")
    if isinstance(removed, str):
        flash(f"Blancco {version} is live, but {removed}.", "warning")
    return _back()


@bp.route("/rollback/<name>", methods=["POST"])
def rollback(name):
    try:
        backup, files = bu.rollback(name)
    except (ValueError, RuntimeError, OSError) as ex:
        flash(f"Not rolled back: {ex}", "danger")
        return _back()
    audit("BLANCCO_ROLLBACK", f"restored {name}; the replaced release saved in {backup}")
    flash(f"Restored {name} ({len(files)} files); its folder is released now that the files are "
          f"live. What was live before is saved in {backup}.", "success")
    return _back()


@bp.route("/staged/<version>/delete", methods=["POST"])
def delete_staged(version):
    try:
        bu.delete_staged(version)
    except (ValueError, RuntimeError, OSError) as ex:
        flash(f"Not deleted: {ex}", "danger")
        return _back()
    audit("BLANCCO_DELETE_STAGED", version)
    flash(f"Deleted staged {version}.", "success")
    return _back()


@bp.route("/backup/<name>/delete", methods=["POST"])
def delete_backup(name):
    try:
        bu.delete_backup(name)
    except (ValueError, OSError) as ex:
        flash(f"Not deleted: {ex}", "danger")
        return _back()
    audit("BLANCCO_DELETE_BACKUP", name)
    flash(f"Deleted {name}.", "success")
    return _back()


@bp.route("/uploads/<name>/delete", methods=["POST"])
def delete_upload(name):
    try:
        bu.delete_upload(name)
    except (ValueError, OSError) as ex:
        flash(f"Not deleted: {ex}", "danger")
        return _back()
    audit("BLANCCO_DELETE_UPLOAD", name)
    flash(f"Deleted {name}.", "success")
    return _back()