Question

I am trying to get specific version in git and commit it as the current version. Consider this example scenario:

tag : v2 (current version)
files : 1.txt,2.txt,3.txt

tag : v1
files : 55.xml,33.yml

I am trying to switch to tag v1 and make it as my current version (get this specific version)

By searching web, i could able to find out way to get all the files

git checkout tag_name
# ex. git checkout v1

And this actually fetches the files from the specific version and loads into my working directory.

But i cannot commit the existing files and push it back to server.

(When it try to push, it shows like no changes pending)

Answer 1

It shows no changes pending because there are no changes. If you want master on the remote to point to v1, you can do an update-ref or a reset on the remote. If you want to create a new commit which is a child of v2 that has the same tree as v1, you could do a merge. What exactly is it that you want to do? Is the remote a bare repo, or is it a working directory? If the former, you should do nothing and anyone who wants to see the files at v1 should checkout v1. If the latter, you should simply checkout v1 on the remote but make no new commits.

From your comments, it sounds like you want to make a new commit to the remote repo which has the same file content as the tag v1. It really is best to simply use update-ref on the remote repo to reset it back to v1, but it is certainly possible to make a new commit. One approach is:

git reset $( echo 'Resetting repo to v1' | git commit-tree $(
    git show -s --format='%T' v1 ) -p v2 )

This computes the tree of v1, invokes commit-tree with that argument to create a new commit object whose parent is v2 (or use HEAD, or whatever you want to be the parent of the new commit) using the commit log “Resetting repo to v1” and then resets the repo so that HEAD points to the new commit. After doing this, you should be able to push to the repo. It might be simpler to just do a pull and merge in the old tree, but that may require a fair bit of manual intervention resolving conflicts.