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Merge several orphan branches into one branch

I had a directory containing several repositories and it looks like this:

folder
|- repo1
|  |- .git
|  |- File1.txt
|- repo2
|  |- .git
|  |- File2.txt
|- repo3
|  |- .git
|  |- File3

I wanted to merge them into one git repository, and I did it following these instructions.

After this instruction, I have the following structure:

folder
|- .git
|- repo1
|  |- File1.txt
|- repo2
|  |- File2.txt
|- repo3
|  |- File3

And that’s great. But now I have a main branch (from repo1) and two orphans in history:

* Merge repo3
|\
| * Add third file
* Merge repo2
|\ 
| * Add second file
* Add first file

What I would like to receive is something like this

* Merge repo 3
* Add third file
* Merge repo 2
* Add second file
* Add first file

or even better

* Add third file
* Add second file
* Add first file.

Is something like this possible? And How?

Learn more about the answer provided by VonC.

I'll start with this:

$ git log --graph
*   commit 888bb0d7a81a40f8b42da7ad3f02103e898f5c1f
|\  Merge: cf85078 eab1269
| | Author: Bojan Delic <...>
| | Date:   Sun Oct 6 13:12:36 2013 +0200
| |
| |     Merge repo3
| |
| * commit eab1269be53929450c34c30416820c13a8058678
|   Author: Bojan Delic <...>
|   Date:   Sun Oct 6 13:07:39 2013 +0200
|
|       Add third file
|
*   commit cf85078ca96d52f2277ad7e4c6f45b04a38cf7ee
|\  Merge: 92fa311 42333f8
| | Author: Bojan Delic <...>
| | Date:   Sun Oct 6 13:12:33 2013 +0200
| |
| |     Merge repo2
| |
| * commit 42333f8589e20d29e5e444d5e16ff1a5d63b8288
|   Author: Bojan Delic <...>
|   Date:   Sun Oct 6 13:07:09 2013 +0200
|
|       Add second file
|
* commit 92fa3113507548a62407431188c308685f72865d
  Author: Bojan Delic <...>
  Date:   Sun Oct 6 13:06:39 2013 +0200

      Add first file

Then I do:

$ git branch -v
* master 888bb0d Merge repo3
$ git checkout -b branch2 eab1269be53929450c34c30416820c13a8058678
$ git checkout -b branch3 42333f8589e20d29e5e444d5e16ff1a5d63b8288
$ git checkout branch2
Switched to branch 'branch2'
$ git rebase master
First, rewinding head to replay your work on top of it...
Fast-forwarded branch2 to master.
$ git checkout master
Switched to branch 'master'
$ git merge branch2
Already up-to-date.
$ git checkout branch3
Switched to branch 'branch3'
$ git rebase master
First, rewinding head to replay your work on top of it...
Fast-forwarded branch3 to master.
$ git checkout master
Switched to branch 'master'
$ git merge branch3
Already up-to-date.

Thereafter:

$ git log --graph
*   commit 888bb0d7a81a40f8b42da7ad3f02103e898f5c1f
|\  Merge: cf85078 eab1269
| | Author: Bojan Delic <...>
| | Date:   Sun Oct 6 13:12:36 2013 +0200
| |
| |     Merge repo3
| |
| * commit eab1269be53929450c34c30416820c13a8058678
|   Author: Bojan Delic <...>
|   Date:   Sun Oct 6 13:07:39 2013 +0200
|
|       Add third file
|
*   commit cf85078ca96d52f2277ad7e4c6f45b04a38cf7ee
|\  Merge: 92fa311 42333f8
| | Author: Bojan Delic <...>
| | Date:   Sun Oct 6 13:12:33 2013 +0200
| |
| |     Merge repo2
| |
| * commit 42333f8589e20d29e5e444d5e16ff1a5d63b8288
|   Author: Bojan Delic <...>
|   Date:   Sun Oct 6 13:07:09 2013 +0200
|
|       Add second file
|
* commit 92fa3113507548a62407431188c308685f72865d
  Author: Bojan Delic <...>
  Date:   Sun Oct 6 13:06:39 2013 +0200

      Add first file

$ git branch -a
  branch2
  branch3
* master
+4
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1 answer

You can reinstall two orphan branches on top of the current master(from repo1)

git checkout branch2
git rebase master
git checkout master
git merge branch2 # fast-forward master to branch2

git checkout branch3
git rebase master
git checkout master
git merge branch3 # fast-forward master to branch3

, ( ),... :

master.
rebase master... master.
eab1269 42333f: , .
, , ( , git gc --aggressive --prune=now )

: git 2.9 ( 2016) (commit d04aa7e --allow-unrelated-histories:

git merge --allow-unrelated-histories a b
+6

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