背景
想要修改或者调试ceph代码，编译代码是少不了的。一些升级工作，也是需要替换二进制，从而需要编译。
步骤do_cmake.sh
1 首先下载代码
参考https://github.com/ceph/ceph，切到你想要的分支，这里我想编译14.2.22，因此运行git checkout v14.2.22。注意这里代码下载要包含各个子模块git submodule update --init --recursive， 可能需要翻墙。 按理也可以通过tarball下载，参考https://download.ceph.com/tarballs/, 这里tarball用来制作rpm包。
2 编译
参考官网 https://docs.ceph.com/en/nautilus/install/build-ceph/编译步骤，按理是比较简单的，这里遇到几个问题。
2.1 python-scipy问题 （针对14.2.22）
参考python-scipy， 需要判断scipy
# diff ceph.spec.in ceph.spec.org （针对14.2.22）
299,303c299
< %if 0%{without python2}
< BuildRequires: python3-scipy
< %else
< BuildRequires: python27-scipy
< %endif
---
> BuildRequires: python%{_python_buildid}-scipy
2.2 gcc 版本问题
参考 升级gcc， 因为c++17，需要升级gcc7， 需要升级gcc。。
2.3 Can't find sphinx-build.
解决办法：
yum install python-sphinx
2.4 systemed-sysusers依赖问题
添加skip-broken，参考下图
2.5 编译错误googletest
有人提交了解决方案，参考https://github.com/ceph/ceph/pull/43491/files
2.6 Could NOT find verbs (missing: VERBS_LIBRARIES VERBS_INCLUDE_DIR)
解决办法：
yum install rdma-core-devel
2.7 Could NOT find udev (missing: UDEV_LIBRARIES UDEV_INCLUDE_DIR)
解决办法：
yum install systemd-devel
2.8 Could NOT find blkid (missing: BLKID_LIBRARIES BLKID_INCLUDE_DIR)
解决办法：
yum install libblkid-devel
2.9 Could NOT find keyutils (missing: KEYUTILS_LIBRARIES KEYUTILS_INCLUDE_DIR)
yum install keyutils-libs-devel
2.10 Could NOT find OpenLdap (missing: OPENLDAP_INCLUDE_DIR LDAP_LIBRARY
yum install openldap-devel
2.11 Could NOT find leveldb (missing: LEVELDB_LIBRARIES LEVELDB_INCLUDE_DIR)
yum install leveldb-devel
2.12 Could NOT find snappy (missing: SNAPPY_LIBRARIES SNAPPY_INCLUDE_DIR)
yum install snappy-devel
2.13 Could NOT find LZ4 (missing: LZ4_LIBRARY LZ4_INCLUDE_DIR) (Required is at
least version "1.7")
yum install lz4-devel
2.14 12.Could NOT find CURL (missing: CURL_LIBRARY CURL_INCLUDE_DIR)
yum install curl-devel
2.15 no package nss found
yum install nss-devel.x86_64
2.16 PythonLibs
yum install python-devel.x86_64
2.17
yum install Cython.x86_64
yum install ncurses-devel
2.15 其它
yum install libaio-devel openssl-devel expat-devel liboath-devel lttng-ust-devel libbabeltrace-devel python36-Cython fuse-devel libnl3-devel librabbitmq-devel libcap-ng-devel gperf librabbitmq-devel librdkafka-devel nss
2.16 需要使用vscode的，要在CMakelist.txt的这个位置上加上CMAKE_EXPORT_COMPILE_COMMANDS
set(VERSION 14.2.16)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
2.7 最后编译rpm有几个问题
参考http://strugglesquirrel.com/2019/01/03/%E6%89%8B%E5%8A%A8%E7%BC%96%E8%AF%91ceph/， 这里面都有说明，不再详述
步骤build （14.2.16）
python setup.py egg_info failed with error code 1 in /tmp/pip-build
参考 https://www.mlzhilu.com/archives/commandpythonsetuppyegginfofailedwitherrorcode1intmppip-build- 解决方法1npx build: not found
修改ceph/build/src/pybind/mgr/dashboard/CMakeFiles/mgr-dashboard-frontend-build.dir/build.make, 从"build: -- -- --progress=false" 到"build:en-US -- -- --progress=false"， 我理解en-US是一个任务，而这里没指定任务
参考：
[1] https://blog.csdn.net/helloanthea/article/details/103728684
