只有当我在每月数据限制的移动电话上运行apt更新时才能获取差异？

Question

我正在运行Ubuntu 20.04。我通过移动电话连接互联网，每月的数据限制。当我跑的时候

apt update

它从存储库中获取大约60 MB的数据。是否有一种方法只获取以前运行的apt update之间的差异？

编辑：

sudo apt update 
Hit:1 http://archive.canonical.com/ubuntu focal InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal InRelease
Get:3 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:4 http://archive.ubuntu.com/ubuntu focal-security InRelease [109 kB]
Get:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]
Get:6 http://archive.ubuntu.com/ubuntu focal-updates/main Sources [364 kB]
Get:7 http://archive.ubuntu.com/ubuntu focal-updates/multiverse Sources [9,912 B]
Get:8 http://archive.ubuntu.com/ubuntu focal-updates/restricted Sources [10.1 kB]
Get:9 http://archive.ubuntu.com/ubuntu focal-updates/universe Sources [146 kB]
Get:10 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [795 kB]
Get:11 http://archive.ubuntu.com/ubuntu focal-updates/main Translation-en [192 kB]
Get:12 http://archive.ubuntu.com/ubuntu focal-updates amd64 Contents (deb) [29.7 MB]
Get:13 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages [143 kB]
Get:14 http://archive.ubuntu.com/ubuntu focal-updates/restricted Translation-en [21.3 kB]
Get:15 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [736 kB]
Get:16 http://archive.ubuntu.com/ubuntu focal-updates/universe Translation-en [152 kB]
Get:17 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 Packages [16.9 kB]
Get:18 http://archive.ubuntu.com/ubuntu focal-updates/multiverse Translation-en [5,076 B]
Get:19 http://archive.ubuntu.com/ubuntu focal-security/universe Sources [42.9 kB]
Get:20 http://archive.ubuntu.com/ubuntu focal-security/main Sources [122 kB]   
Get:21 http://archive.ubuntu.com/ubuntu focal-security/restricted Sources [8,960 B]
Get:22 http://archive.ubuntu.com/ubuntu focal-security/main amd64 Packages [480 kB]
Get:23 http://archive.ubuntu.com/ubuntu focal-security/main Translation-en [105 kB]
Get:24 http://archive.ubuntu.com/ubuntu focal-security amd64 Contents (deb) [23.6 MB]
Get:25 http://archive.ubuntu.com/ubuntu focal-security/restricted amd64 Packages [120 kB]
Get:26 http://archive.ubuntu.com/ubuntu focal-security/restricted Translation-en [17.6 kB]
Get:27 http://archive.ubuntu.com/ubuntu focal-security/universe amd64 Packages [532 kB]
Get:27 http://archive.ubuntu.com/ubuntu focal-security/universe amd64 Packages [532 kB]
Get:28 http://archive.ubuntu.com/ubuntu focal-security/universe Translation-en [74.5 kB]

看一看这些：

Get:12 http://archive.ubuntu.com/ubuntu focal-updates amd64 Contents (deb) [29.7 MB]

Get:24 http://archive.ubuntu.com/ubuntu focal-security amd64 Contents (deb) [23.6 MB]

Answer 1

正如@没人提到的那样，你下载的这些大文件都是从apt-file下载的。基于医生们，您可以通过修改/etc/apt/apt.conf.d/50apt-file.conf文件并运行/usr/share/doc/apt-file/examples/apt-file-2-update.sh来配置它。

在那里，您可以为这些.deb文件设置一个本地缓存，如下所示：

$ mkdir -p ~/.cache/apt-file ~/.config
$ touch ~/.cache/apt-file/dpkg-status
$ sed '/^Dir::State/ d; /^Dir::Cache/ d;' \
       /usr/share/doc/apt-file/examples/apt-file.conf \
       > ~/.config/apt-file.conf
$ cat <> ~/.config/apt-file.conf
       Dir::State "$HOME/.cache/apt-file";
       Dir::Cache "$HOME/.cache/apt-file";
       Dir::State::status "$HOME/.cache/apt-file/dpkg-status";

从那里可以独立于apt-file更新apt缓存，方法是调用：

$ apt-file -c ~/.config/apt-file.conf update

这是采取直接从手册中，所以可能需要一些调整。