最近发生件奇怪的事，我的git管理，clone,add,commit 都可以。但是git tag 时候就报错：git tag :gpg: skipped "xxx@xxx": secret key not available。网上找了很久找到办法记录下：
https://stackoverflow.com/questions/12061645/generating-a-gpg-key-for-%20git-tagging
1、首先运行下面命令
$ gpg --list-key运行完了发现什么都没用，原来是我没有gpg key，那就创建下
$ gpg --gen-key gpg (GnuPG) 2.0.14; Copyright (C) 2009 Free Software Foundation, Inc. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Please select what kind of key you want: (1) RSA and RSA (default) (2) DSA and Elgamal (3) DSA (sign only) (4) RSA (sign only) Your selection? 1 RSA keys may be between 1024 and 4096 bits long. What keysize do you want? (2048)我选择了第一个类型，问你要多大长度，根据提示输入了2048.
Requested keysize is 2048 bits Please specify how long the key should be valid. 0 = key does not expire <n> = key expires in n days <n>w = key expires in n weeks <n>m = key expires in n months <n>y = key expires in n years Key is valid for? (0) Key does not expire at all Is this correct? (y/N) ykey 选择0，输入y确认，
GnuPG needs to construct a user ID to identify your key. Real name: xxx Email address: xxx@example.com Comment: gpg for xxx
分别输入 real name,email comment .
然后按要求输入密码。直接回车就好，和创建git-key 类似。
最后再次输入git tag -s v1.0 -m"xxxx" 终于可以了。
补充：
过了一段时间发现问题又出现了:
继续输入gpg --list-key 发现key是存在的，此时需要对key从先签入。
signingkey为908F90A5
执行命令：
git config user.signingkey 908F90A5终于又正常了
