Rollback last "git pull upstream" (conflict occurs) into the old state -

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i did update file , committed changes (efe5e5d (head, master) change caption), fired git pull upstream while upstream's code changed recently, of course caused me conflict.

git show-ref

efe5e5d65603419288e40b8e964aecba4626c99f refs/heads/master 879020dbcd1cf1f797577b66a9416c1007a1ad29 refs/remotes/upstream/head 20e54d8ccaa4dba7890fa5db2e89394ab33a0c81 refs/remotes/upstream/dev 879020dbcd1cf1f797577b66a9416c1007a1ad29 refs/remotes/upstream/master

the conflicted file (index.html)

<<<<<<< head     <a href="about.html" class="btn btn-success">goto about</a> =======     <a href="about.html" class="btn btn-success">about page</a> >>>>>>> 879020dbcd1cf1f797577b66a9416c1007a1ad29

git status

your branch , 'upstream/master' have diverged, , have 1 , 1 different commit each, respectively.   (use "git pull" merge remote branch yours)  have unmerged paths.   (fix conflicts , run "git commit")  unmerged paths:   (use "git add <file>..." mark resolution)          both modified:   index.html

git log

* efe5e5d f72465f (head, master) change caption      * f72465f 28645ce add link button                          * 28645ce 48c2640 20e54d8 merge branch dev'

question how rollback last git pull upstream old state?

the purpose of learn, it's not real code. think cannot use git reset, think following related.

  1. git update-ref refs/remotes/upstream/master refs/remotes/upstream/master@{1}
  2. git checkout -- index.html (i'm not sure because git status suggest this)
  3. what should refs/remotes/upstream/head ?

please guide thanks.

edited

i think have found solution problem.

  1. git merge --abort
  2. git update-ref refs/remotes/upstream/master refs/remotes/upstream/master@{1}

with these 2 commands, can fire git pull upstream again never happenned before.

while doing git pull, tracking branch updated , merge performed between remote branch , local branch. if conflict occurs, merge stops in between allowing resolve them , git commit. have @ this: 

you have unmerged paths.   (fix conflicts , run "git commit")

the merge finishes after git commit. so, return state branch before git pull upstream, you'll have hard reset since changes still unmerged.

git reset --hard

it remove staged changes. remove conflicted files also(which unstaged), following.

git add index.html git reset --hard

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