自上周六 (2019-10-12) 以来，使用 EPEL 存储库的 Amazon Linux 2 AMI 上的依赖项似乎rlwrap已损坏。问题是rlwrap需要 Python3.6（包python36），但无法从任何来源获得。我猜想目前许多包都存在此依赖性问题。
这是 Amazon Linux 或 EPEL 开发人员的疏忽吗？还是我做错了什么？
rlwrap现在找不到依赖项，有什么方法可以安装吗？
问题重现说明
在干净的 Amazon Linux 2 服务器上，启用 EPEL 存储库并尝试安装 rlwrap（以 root 身份，或使用sudo）：
amazon-linux-extras enable epel
yum clean metadata
yum install -y epel-release
yum install -y rlwrap
最后一个命令产生以下输出：
Loaded plugins: extras_suggestions, langpacks, priorities, update-motd
187 packages excluded due to repository priority protections
Resolving Dependencies
--> Running transaction check
---> Package rlwrap.x86_64 0:0.43-2.el7 will be installed
--> Processing Dependency: /usr/bin/python3.6 for package: rlwrap-0.43-2.el7.x86_64
--> Processing Dependency: perl(Data::Dumper) for package: rlwrap-0.43-2.el7.x86_64
--> Processing Dependency: libtinfo.so.5()(64bit) for package: rlwrap-0.43-2.el7.x86_64
--> Running transaction check
---> Package ncurses-compat-libs.x86_64 0:6.0-8.20170212.amzn2.1.3 will be installed
--> Processing Dependency: ncurses-base = 6.0-8.20170212.amzn2.1.3 for package: ncurses-compat-libs-6.0-8.20170212.amzn2.1.3.x86_64
---> Package perl-Data-Dumper.x86_64 0:2.145-3.amzn2.0.2 will be installed
---> Package rlwrap.x86_64 0:0.43-2.el7 will be installed
--> Processing Dependency: /usr/bin/python3.6 for package: rlwrap-0.43-2.el7.x86_64
--> Running transaction check
---> Package ncurses-base.noarch 0:6.0-8.20170212.amzn2.1.2 will be updated
--> Processing Dependency: ncurses-base = 6.0-8.20170212.amzn2.1.2 for package: ncurses-libs-6.0-8.20170212.amzn2.1.2.x86_64
---> Package ncurses-base.noarch 0:6.0-8.20170212.amzn2.1.3 will be an update
---> Package rlwrap.x86_64 0:0.43-2.el7 will be installed
--> Processing Dependency: /usr/bin/python3.6 for package: rlwrap-0.43-2.el7.x86_64
--> Running transaction check
---> Package ncurses-libs.x86_64 0:6.0-8.20170212.amzn2.1.2 will be updated
--> Processing Dependency: ncurses-libs(x86-64) = 6.0-8.20170212.amzn2.1.2 for package: ncurses-6.0-8.20170212.amzn2.1.2.x86_64
---> Package ncurses-libs.x86_64 0:6.0-8.20170212.amzn2.1.3 will be an update
---> Package rlwrap.x86_64 0:0.43-2.el7 will be installed
--> Processing Dependency: /usr/bin/python3.6 for package: rlwrap-0.43-2.el7.x86_64
--> Running transaction check
---> Package ncurses.x86_64 0:6.0-8.20170212.amzn2.1.2 will be updated
---> Package ncurses.x86_64 0:6.0-8.20170212.amzn2.1.3 will be an update
---> Package rlwrap.x86_64 0:0.43-2.el7 will be installed
--> Processing Dependency: /usr/bin/python3.6 for package: rlwrap-0.43-2.el7.x86_64
--> Processing Dependency: /usr/bin/python3.6 for package: rlwrap-0.43-2.el7.x86_64
--> Finished Dependency Resolution
Error: Package: rlwrap-0.43-2.el7.x86_64 (epel)
Requires: /usr/bin/python3.6
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
编辑：同样的问题已发布到AWS 开发人员论坛。显然，Amazon Linux 团队已经意识到了这种不兼容性，并正在努力寻找解决方案。
答案1
你必须python3从amazon-extrasrepo 安装：
amazon-linux-extras install python3
有一个警告：根据amazon-linux-extras list | grep python3，当前支持的版本是3.6.2，如果 AWS 发布对3.7.xvia extras 的支持，那么上面的安装命令就会不明确。
最好使用以下内容：
amazon-linux-extras enable python3
yum clean metadata
yum install python3-3.6.* --disablerepo=amzn2-core
然后yum install -y rlwrap就成功完成了。