release_handler模块¶

Unpacking and Installation of Release Packages

简介¶

状态:

unpacked, current, permanent, or old
% 各状态转换:

Status     Action                NextStatus
-------------------------------------------
-          unpack                unpacked
unpacked   install               current
           remove                -
current    make_permanent        permanent
           install other         old
           remove                -
permanent  make other permanent  old
           install               permanent
old        reboot_old            permanent
           install               current
           remove                -

framework包含:

Offline support - systools for generating scripts and building release packages
Online support - release_handler for unpacking and installing release packages

install_release/1/2¶

结构:

install_release(Vsn) -> {ok, OtherVsn, Descr} | {error, Reason}
install_release(Vsn, [Opt]) -> {ok, OtherVsn, Descr} | {continue_after_restart, OtherVsn, Descr} | {error, Reason}
类型:
Vsn = OtherVsn = string()
Opt = {error_action, Action} | {code_change_timeout, Timeout}
   | {suspend_timeout, Timeout} | {update_paths, Bool}
 Action = restart | reboot
 Timeout = default | infinity | pos_integer()
 Bool = boolean()
Descr = term()
Reason = {illegal_option, Opt} | {already_installed, Vsn} | {change_appl_data, term()} | {missing_base_app, OtherVsn, App} | {could_not_create_hybrid_boot, term()} | term()
App = atom()

make_permanent/1¶

结构:

make_permanent(Vsn) -> ok | {error, Reason}
类型:
Vsn = string()
Reason = {bad_status, Status} | term()
Makes the specified release version Vsn permanent.

remove_release/1¶

结构:

remove_release(Vsn) -> ok | {error, Reason}
Types
Vsn = string()
Reason = {permanent, Vsn} | client_node | term()
Removes a release and its files from the system. The release must not be the permanent release. Removes only the files and directories not in use by another release.