def snapshot():
"""
Takes snapshot of the system packages. The snapshot is only a record of which packages are currently
installed. The record is kept by pisilinux history mechanism as it works automatically on install, remove
and upgrade operations.
"""
installdb = pisilinux.db.installdb.InstallDB()
historydb = pisilinux.db.historydb.HistoryDB()
historydb.create_history("snapshot")
li = installdb.list_installed()
progress = ctx.ui.Progress(len(li))
processed = 0
for name in installdb.list_installed():
package = installdb.get_package(name)
historydb.add_package(pkgBefore=package, operation="snapshot")
# Save changed config files of the package in snapshot
for f in installdb.get_files(name).list:
if f.type == "config" and pisilinux.util.config_changed(f):
fpath = pisilinux.util.join_path(ctx.config.dest_dir(), f.path)
historydb.save_config(name, fpath)
processed += 1
ctx.ui.display_progress(operation = "snapshot",
percent = progress.update(processed),
info = _("Taking snapshot of the system"))
historydb.update_history()
def list_upgradable():
"""
Return a list of packages that are upgraded in the repository -> list_of_strings
"""
installdb = pisilinux.db.installdb.InstallDB()
is_upgradable = pisilinux.operations.upgrade.is_upgradable
upgradable = list(filter(is_upgradable, installdb.list_installed()))
# replaced packages can not pass is_upgradable test, so we add them manually
upgradable.extend(list_replaces())
# consider also blacklist filtering
upgradable = pisilinux.blacklist.exclude_from(upgradable, ctx.const.blacklist)
return upgradable