repo sync命令的替代方法是什么? [英] What will be the alternative for repo sync command?

问题描述

我是git的新手，我想在执行repo init之后手动执行清单文件，而不是执行repo sync.在不同情况下测量普通git命令和repo sync之间的时间差.但是我不确定要使用哪个git命令来回购.

I am new to git and I want to execute manifest file manually after doing repo init, instead of doing repo sync. To measure the time difference between normal git commands and repo sync in different cases. But I am not sure which git command to does repo uses.

我知道repo只是大型代码库的git包装.

I know that repo is just an wrapper for git for large codebase.

如果我具有以下变量，我只想知道git clone的确切命令是什么.

I just want to know what will be the exact command for git clone If I have the following Variables.

-名称 - 小路 - 修订 - 上游 -远程

- name - path - revision - upstream - remote

我知道如何为git clone形成一个url，但是不确定版本和上游.

I know how to form a url for git clone but not sure about revision and upstream.

推荐答案

以下是示例清单default.xml:

<manifest>
        <remote  name="aosp"
               fetch="https://android.googlesource.com/"/>
        <remote  name="test"
               fetch="https://github.com/test/"/>
        <default revision="master"
               remote="test"
               sync-j="4" />
        <project name="platform/tools/motodev" path="tools/motodev" revision="69989786cefbde82527960a1e100ec9afba46a98" upstream="master" remote="aosp"/>
</manifest>

创建用于测试的父目录

mkdir repotest
cd repotest

为清单创建git存储库

Create a git repository for the manifest

mkdir local_manifest
cd local_manifest
git init
# Create the default.xml file
git add default.xml
git commit -m "Local Manifest"
cd ..

下载 repo工具

mkdir -p .bin
PATH="${HOME}/repotest/.bin:${PATH}"
curl https://storage.googleapis.com/git-repo-downloads/repo > .bin/repo
chmod a+rx .bin/repo

基于本地清单的初始化

mkdir test
cd test
repo init -u ~/repotest/local_manifest/

修改repo的源代码以获取更多调试输出(除了--trace和GIT_TRACE=1之外)

Modify source code of repo to get more debugging output (in addition to --trace and GIT_TRACE=1)

nano .repo/repo/git_command.py
# Remove stderr argument from the subprocess.Popen call (line no: ~292)
# Also comment the line at line no: ~331 which includes the use of the above removed argument stderr
# Save the file and exit

同步

export GIT_TRACE=1
repo --trace sync &> ../log
cd ..

过滤日志

grep "built-in:\|curl\|export" < log > temp
awk -F '[0-9][0-9]:[0-9][0-9]:[0-9][0-9].[0-9]+ git.c:' '{print $1}' > trim1 < temp
awk -F 'trace: built-in:' '{print $2}' > trim2 < temp
paste -d' ' trim1 trim2 > filtered_log

过滤日志显示正在执行的git命令的顺序

Filtered Log shows the sequence of git commands being executed

  git version
  git describe HEAD
  git config --file /home/test/repotest/test/.repo/manifests.git/config --null --list
  git config --file /home/test/repotest/test/.repo/repo/.git/config --null --list
: export GIT_DIR=/home/test/repotest/test/.repo/manifests.git 
  git fetch origin --tags '+refs/tags/*:refs/tags/*' '+refs/heads/*:refs/remotes/origin/*' +refs/heads/master:refs/remotes/origin/master
  git upload-pack /home/test/repotest/local_manifest/
  git rev-list --objects --stdin --not --all --quiet --alternate-refs
  git gc --auto
  git symbolic-ref -m 'manifest set to refs/heads/master' refs/remotes/m/master refs/remotes/origin/master
: export GIT_DIR=/home/test/repotest/test/.repo/project-objects/platform/tools/motodev.git 
  git init
  git config --file /home/test/repotest/test/.repo/projects/tools/motodev.git/config --null --list
  git config --file /home/test/repotest/test/.repo/projects/tools/motodev.git/config --replace-all filter.lfs.smudge 'git-lfs smudge --skip -- %f'
  git config --file /home/test/repotest/test/.repo/projects/tools/motodev.git/config --replace-all filter.lfs.process 'git-lfs filter-process --skip'
  git config --file /home/test/repotest/test/.repo/projects/tools/motodev.git/config --unset-all core.bare
  git config --file /home/test/repotest/test/.repo/projects/tools/motodev.git/config --replace-all remote.aosp.url https://android.googlesource.com/platform/tools/motodev
  git config --file /home/test/repotest/test/.repo/projects/tools/motodev.git/config --replace-all remote.aosp.projectname platform/tools/motodev
  git config --file /home/test/repotest/test/.repo/projects/tools/motodev.git/config --replace-all remote.aosp.fetch '+refs/heads/*:refs/remotes/aosp/*'
curl --fail --output /home/test/repotest/test/.repo/projects/tools/motodev.git/clone.bundle.tmp --netrc --location https://android.googlesource.com/platform/tools/motodev/clone.bundle 
: export GIT_DIR=/home/test/repotest/test/.repo/projects/tools/motodev.git 
  git fetch /home/test/repotest/test/.repo/projects/tools/motodev.git/clone.bundle '+refs/heads/*:refs/remotes/aosp/*' '+refs/tags/*:refs/tags/*'
  git index-pack --fix-thin --stdin
  git rev-list --objects --stdin --not --all --quiet --alternate-refs
  git gc --auto
  git fetch aosp --tags '+refs/tags/*:refs/tags/*' '+refs/heads/*:refs/remotes/aosp/*' +refs/heads/master:refs/remotes/aosp/master
  git fetch-pack --stateless-rpc --stdin --lock-pack --thin --no-progress https://android.googlesource.com/platform/tools/motodev/
  git unpack-objects -q --pack_header=2,2
  git rev-list --objects --stdin --not --all --quiet --alternate-refs
  git gc --auto
  git update-ref -m 'manifest set to 69989786cefbde82527960a1e100ec9afba46a98' --no-deref refs/remotes/m/master 69989786cefbde82527960a1e100ec9afba46a98^0
  git gc --auto
  git read-tree --reset -u -v HEAD

现在有很多命令. (观察:repo使用curl下载存储库.)

Now that's a lot of commands. (Observation: repo uses curl to download the repositories).

根据用户 ElpieKay 的建议，对于上述清单文件，git命令的近似值为:

As suggested by User ElpieKay, for the above manifest file, an approximation of git commands would be:

git clone https://android.googlesource.com/platform/tools/motodev -b master -- tools/motodev 
cd tools/motodev
git checkout 69989786cefbde82527960a1e100ec9afba46a98

要比较repo工具和git的性能，可以执行以下操作:

To compare the performance of the repo tool and git, you can do :

# For repo tool
repo --time sync

# For git commands
export GIT_TRACE_PERFORMANCE=1
git clone $remote -b $upstream -- $path 
cd $path 
git checkout $revision

或使用 time 命令获得全部执行git命令的时间

or using time command to get the total execution time of the git commands

time -p sh -c 'git clone $remote -b $upstream -- $path ; cd $path ; git checkout $revision'

注意:远程具有fetch属性，其值是服务器的url前缀.前缀和名称构成了远程存储库的实际URL-用户 ElpieKay

Note: remote has an attribute fetch whose value is the url prefix of the server. The prefix and name form the actual url to the remote repository - User ElpieKay

有关调试变量的更多信息， git:

More on the Debugging Variables used in git:

GIT_TRACE_PERFORMANCE

控制性能数据的记录.输出 显示每个特定的git调用需要多长时间.

controls logging of performance data. The output shows how long each particular git invocation takes.

GIT_TRACE

控制常规迹线，这些迹线不属于任何特定类别. 这包括扩展别名，以及将其委托给其他人. 子程序.

controls general traces, which don’t fit into any specific category. This includes the expansion of aliases, and delegation to other sub-programs.

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