I need to create a new branch, from the existing branch using the git checkout and option start-point but I am not sure how I can determine it properly. from git log I need to find a commit which has specific transaction number in the message. E.g. from git log

..........................................
commit b91a725feea867e371c5488e9fe60ca4cd0e927f
Author: john.smith
Date:   Tue Mar 15 11:54:50 2022  0100

    Improve error messages for instrument creation

    [AccuRev transaction: 20839205]

commit c4d1ebd3da59efa7223876b1de37960f2e6bcbff
Author: john.smith
Date:   Fri Mar 11 16:52:04 2022  0100

    Added new libraries

    [AccuRev transaction: 20829020]
   ...............................

So for example I need to find the commit which message contains this string (with specific Transaction number value): [AccuRev transaction: 20829020] So two questions:

1. how to get this specific log message from all the git logs and how to retrieve commit hash id for that particular commit?
2. will it be enough to execute command git checkout -b branchName commitHashId to create a new branch from that specific start-point?

Edit: git log --grep does not provide me with correct result when trying to filter specific ID: Please look at the example:

git log --grep="[AccuRev transaction: 698102]"
commit f6d975e531b15c14683155a9e3ceca45d6a51854 (HEAD -> SoftBroker)
Author: stefan
Date:   Mon Feb 21 10:57:34 2022  0100

    SPRs ,,,JIRA Issues SOF-46,SOF-49,SOF-6782,SOF-6784 Promote pom files.

    [AccuRev transaction: 20754456]

commit 0ee4ede74e3efe9d98a42ae5a6cb4c2641cd1384
Author: alek
Date:   Mon Feb 7 17:08:17 2022  0100

    SOF-6707: Account should be pre-selected after user login    
    [AccuRev transaction: 20706246]

commit 633a0f21584f5578aaac1848255aa850bc95b52a
Author: alek
Date:   Mon Feb 7 17:06:18 2022  0100

    JIRA Issue increasing version to 2022.1.1 and 2022.Q1.1

    [AccuRev transaction: 20706239]

Thanks a lot

CodePudding user response：

To find a revision that has a certain message you do:

git log --grep=whatever-you-need-to-find

That should give you a list of revisions that match the regex that you provided. Then, it is the question about checking out an a branch.

git checkout some-revision-id does not create a new branch. All git will do is go to that revision and put in on the working tree and you will be working on what is called a detached HEAD.... in other words, you will be working without a branch (perfectly fine... one of the best features that git has... among a big list of great features). If you want to create a branch from that point, you should then run

git checkout -b some-new-branch some-revision-id

Which will create the new branch on that revision and check it out, in a single operation.

CodePudding user response：

Git has revision syntax for simply naming commits by message content.

git checkout -b mynewbranch ':/\[AccuRev transaction: 20829020\]'

with the backslashes needed because [ is a syntax marker in the search- expression language