git提示“Pull is not possible because you have unmerged files.”的解決辦法

在git pull的過程中，如果有衝突，那麼除了衝突的檔案之外，其它的檔案都會做為staged區的檔案儲存起來。

重現：

$ git pull

A    Applications/Commerce/BookingAnalysis.java
A    Applications/Commerce/ClickSummaryFormatter.java
M    Applications/CommerceForecasting/forecast/Forecast.java
A    Applications/CommerceForecasting/forecast/ForecastCurveProviderCategory.java
M    Applications/CommerceForecasting/forecast/ForecastProvider.java
M    Applications/CommerceForecasting/forecast/InputPropertyItem.java
......

A    Applications/LocalezeImporter/com/tripadvisor/feeds/SingleMenuLocalezeMatcher.java
A    Applications/LocalezeImporter/com/tripadvisor/feeds/TypeCategory.java

Pull is not possible because you have unmerged files.
Please, fix them up in the work tree, and then use 'git add/rm <file>'
as appropriate to mark resolution, or use 'git commit -a'.

通過git status你會發現下面古怪的事情：

zhonghua@pts/ttys000 $ git status
# On branch sns
# Your branch and 'snsconnect/sns' have diverged,
# and have 1 and 52 different commit(s) each, respectively.
#
# Changes to be committed:
#
#    new file:   src/config/features_daodao.ini
#    new file:   src/config/services.xml
#    new file:   src/config/svnroot/hooks/mailer.conf
#    new file:   src/config/svnroot/hooks/mailer.py
#    new file:   src/config/svnroot/hooks/post-commit
#    new file:   src/config/svnroot/hooks/pre-commit
#    new file:   src/config/svnroot/hooks/prerelease_notifications.py
#    new file:   src/config/svnroot/hooks/run_checks.py
…….

# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#    _build/
#    css/combined/
#    css/gen/
#    daodao-site.patch
#    daodao-site.patch1
#    js/combined/
#    js/gen/
#    lib/weibo/
#    src/bin/

Pull is not possible because you have unmerged files.

解決：

1.pull會使用git merge導致衝突，需要將衝突的檔案resolve掉 git add -u, git commit之後才能成功pull.

2.如果想放棄本地的檔案修改，可以使用

git reset --hard FETCH_HEAD

FETCH_HEAD表示上一次成功git pull之後形成的commit點。然後git pull.
注意：

git merge會形成MERGE-HEAD(FETCH-HEAD) 。git push會形成HEAD這樣的引用。HEAD代表本地最近成功push後形成的引用。