repo sync 命令的替代方案是什么？

Question

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。测量不同情况下正常git命令和repo sync命令之间的时间差异。但我不确定 repo 使用哪个 git 命令。

我知道 repo 只是 git 大型代码库的包装器。

我只想知道如果我有以下变量，git clone 的确切命令是什么。

- 姓名 - 小路 - 修订 - 上游 - 远程

我知道如何为 git 克隆形成 url，但不确定修订版和上游。

Answer 1

这是一个示例清单 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

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

Download 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

根据本地清单初始化

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

修改 repo 的源代码以获得更多调试输出（除了 --trace 和 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 }' > trim1 < temp
awk -F 'trace: built-in:' '{print }' > trim2 < temp
paste -d' ' trim1 trim2 > filtered_log

过滤后的日志显示正在执行的 git 个命令的顺序

  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

现在有很多命令了。（观察：repo 使用 curl 下载存储库）。

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

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，您可以这样做：

# 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命令获取git命令的总执行时间

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

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 git 中使用的 Debugging Variables 的更多信息：

GIT_TRACE_PERFORMANCE

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

GIT_TRACE

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

repo sync 命令的替代方案是什么？

What will be the alternative for repo sync command?

git

android-manifest

repo