bash - 如何将变量注入(inject) git submodule foreach？

Question

我有 2 个问题，(1) 如何将变量注入(inject)这个 foreach环形？在下面的例子中，$user_branch无法在第 2 行访问。

USER_BRANCH="foo"
git submodule foreach -q --recursive 'branch="$(git config -f $toplevel/.gitmodules submodule.$name.branch)"; [ "$branch" = "" ] && git checkout $USER_BRANCH || git checkout $branch' –

(2) 有没有办法让这个 foreach进入常规循环？，类似于:

foreach $(git submodules --recursive); do
  #do something
  #more
  #and more
done

Answer 1

解决您的第一个问题，问题是您使用的是单引号，因此您的变量不会被扩展。切换到双引号应该可以修复该部分。

git submodule foreach -q --recursive "git checkout $user_branch"

对于第二个问题， documentation建议您可以在每个模块中运行任意 shell 命令，因此虽然您不能像 bash for 循环那样构造它，但您可以运行 shell 脚本或由 ; 连接的多个命令。 .

foreach [--recursive]

Evaluates an arbitrary shell command in each checked out submodule. The command has access to the variables $name, $path, $sha1 and $toplevel: $name is the name of the relevant submodule section in .gitmodules, $path is the name of the submodule directory relative to the superproject, $sha1 is the commit as recorded in the superproject, and $toplevel is the absolute path to the top-level of the superproject. Any submodules defined in the superproject but not checked out are ignored by this command. Unless given --quiet, foreach prints the name of each submodule before evaluating the command. If --recursive is given, submodules are traversed recursively (i.e. the given shell command is evaluated in nested submodules as well). A non-zero return from the command in any submodule causes the processing to terminate. This can be overridden by adding || : to the end of the command.