GIT 致命：模棱两可的参数“HEAD”：未知修订版或路径不在 Travis 的工作树中

Question

我有以下配置：

git version 1.8.5.6
GNU bash, version 4.2.25(1)-release (x86_64-pc-linux-gnu)

我打电话给zgit_info_update 并尝试提交。但是在 Travis (Git diff command returns error #6069) 中从 Bash 运行 git diff --name-only dev 时我仍然遇到问题。

我怎样才能让它工作？

这里是输出：

git version 1.8.5.6
GNU bash, version 4.2.25(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later       <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
* (detached from FETCH_HEAD)
  master
  remotes/origin/HEAD -> origin/master
  remotes/origin/master
[detached HEAD 72afa70] Add package.json
 1 file changed, 37 insertions(+)
 create mode 100644 package.json
fatal: ambiguous argument 'dev': unknown revision or path not in the   working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'

Answer 1

更简单的解决方法是

git remote set-branches --add origin $BRANCH_TO_DIFF_AGAINST
git fetch
git diff origin/$BRANCH_TO_DIFF_AGAINST

Answer 2

使用以下命令解决了该问题：

if [ "$TRAVIS" == "true" ]; then
  # Resolving `detached HEAD` by attaching HEAD to the `TRAVIS_FROM_BRANCH` branch
  TRAVIS_FROM_BRANCH="travis_from_branch"
  git branch $TRAVIS_FROM_BRANCH
  git checkout $TRAVIS_FROM_BRANCH

  # Fetching `TRAVIS_BRANCH` branch
  git fetch origin $TRAVIS_BRANCH
  git checkout -qf FETCH_HEAD
  git branch $TRAVIS_BRANCH
  git checkout $TRAVIS_BRANCH

  # Switch to `TRAVIS_FROM_BRANCH`
  git checkout $TRAVIS_FROM_BRANCH
fi