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manifestor
Asked: 2018-07-21 00:57:26 +0800 CST

如何找出 debconf-set-selections 的变量名？

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假设我想mysql从脚本安装，而不被问到任何配置问题，比如我想设置什么 root 密码apt。然后我会预设debconf变量：

echo mysql-server-5.5 mysql-server/root_password password xyzzy | debconf-set-selections
echo mysql-server-5.5 mysql-server/root_password_again password xyzzy | debconf-set-selections

我从教程中得到了这个。我不清楚的是：这家伙是如何找到变量名的？他怎么知道他必须分别设置mysql-server-5.5 mysql-server/root_password password和mysql-server-5.5 mysql-server/root_password_again？

我知道我可以.deb通过发布来提取包dpkg-deb -R package.deb EXTRACTDIR/- 但我看不到这些变量的存储位置。

我如何找出debconf任何其他包的变量？

debian apt

2 个回答

  1. 您可以使用获取特定已安装软件包的变量debconf-show packagename

    前任。

    $ sudo debconf-show mysql-server-5.7
* mysql-server/root_password: (password omitted)
* mysql-server/root_password_again: (password omitted)
  mysql-server-5.7/start_on_boot: true
  mysql-server/no_upgrade_when_using_ndb:
  mysql-server/password_mismatch:
  mysql-server-5.7/really_downgrade: false
  mysql-server-5.7/nis_warning:
  mysql-server-5.7/postrm_remove_databases: false
  mysql-server-5.7/installation_freeze_mode_active:

    您可以使用 获取在数据库中具有变量的所有已安装软件包的列表debconf-show --listowners，因此如果您不确定软件包名称是什么，您可以执行类似的操作

    # debconf-show --listowners | grep mysql | xargs debconf-show
* mysql-server/root_password: (password omitted)
* mysql-server/root_password_again: (password omitted)
  mysql-server-5.7/postrm_remove_databases: false
  mysql-server-5.7/nis_warning:
  mysql-server-5.7/installation_freeze_mode_active:
  mysql-server/password_mismatch:
  mysql-server-5.7/start_on_boot: true
  mysql-server/no_upgrade_when_using_ndb:
  mysql-server-5.7/really_downgrade: false
    • 15
  2. Best Answer

    您可以debconf使用debconf-get-selections. 如果您实际上已经完成了安装，这将很有用。

    或者，这些设置用于包维护者脚本。使用dpkg-deb您运行的命令，这些DEBIAN位于EXTRACTDIR.

    例如，来自lightdm：

    $ grep db_ lightdm/DEBIAN -R
lightdm/DEBIAN/postrm:  db_purge
lightdm/DEBIAN/prerm:    db_unregister shared/default-x-display-manager
lightdm/DEBIAN/prerm:    if db_get shared/default-x-display-manager; then
lightdm/DEBIAN/prerm:      db_metaget shared/default-x-display-manager owners
lightdm/DEBIAN/prerm:      db_subst shared/default-x-display-manager choices "$RET"
lightdm/DEBIAN/prerm:      db_get shared/default-x-display-manager
lightdm/DEBIAN/prerm:     if db_get "$RET"/daemon_name; then
lightdm/DEBIAN/prerm:        db_fset shared/default-x-display-manager seen false
lightdm/DEBIAN/prerm:        db_input critical shared/default-x-display-manager || true
lightdm/DEBIAN/prerm:        db_go
lightdm/DEBIAN/prerm:          db_get shared/default-x-display-manager
lightdm/DEBIAN/prerm:          db_get "$RET"/daemon_name
lightdm/DEBIAN/postinst:  if db_get shared/default-x-display-manager; then
lightdm/DEBIAN/postinst:    if db_get "$DEFAULT_DISPLAY_MANAGER"/daemon_name; then
lightdm/DEBIAN/postinst:db_stop
lightdm/DEBIAN/config:if db_metaget shared/default-x-display-manager owners; then
lightdm/DEBIAN/config:if db_metaget shared/default-x-display-manager choices; then
lightdm/DEBIAN/config:  db_subst shared/default-x-display-manager choices "$OWNERS" || :
lightdm/DEBIAN/config:  db_fset shared/default-x-display-manager seen false || :
lightdm/DEBIAN/config:    db_set shared/default-x-display-manager "$CURRENT_DEFAULT"
lightdm/DEBIAN/config:  if db_get shared/default-x-display-manager; then
lightdm/DEBIAN/config:    db_set shared/default-x-display-manager lightdm
lightdm/DEBIAN/config:    db_fset shared/default-x-display-manager seen true
lightdm/DEBIAN/config:    db_input high shared/default-x-display-manager || :
lightdm/DEBIAN/config:    db_go || :
lightdm/DEBIAN/config:if db_get shared/default-x-display-manager; then

    各种db_*函数是用于处理的辅助函数debconf，从/usr/share/debconf/confmodule.

    因此，在 的情况下lightdm，shared/default-x-display-manager是一个重要的debconf关键。

    • 4

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