How to search a Git repository by commit message?

I checked some source code into GIT with the commit message "Build 0051".

However, I can't seem to find that source code any more - how do I extract this source from the GIT repository, using the command line?

Update

Checked in versions 0043, 0044, 0045 and 0046 using SmartGIT.

Checked out 0043, and checked in versions up to 0051 on a different branch.

Checked out 0043 again.

Now, 0051 has disappeared.

Update

The source code is definitely there, now its a matter of checking it out:

C:Source>git log -g --grep="0052"
commit 77b1f718d19e5cf46e2fab8405a9a0859c9c2889
Reflog: HEAD@{10} (unknown <Mike@.(none)>)
Reflog message: commit: 20110819 - 1724 - GL: Intermediate version. File version:  v0.5.0 build 0052.
Author: unknown <Mike@.(none)>
Date:   Fri Aug 19 17:24:51 2011 +0100

    20110819 - 1724 - GL: Intermediate version. File version: v0.5.0 build 0052.

C:Source>

Update

Used the following to retrieve the lost source code:

C:Source>git checkout HEAD@{10}
Previous HEAD position was aa09ace... 20110819 - 1045 - GL: Intermediate version. File     version: v0.5.0 build 0043.
HEAD is now at 77b1f71... 20110819 - 1724 - GL: Intermediate version. File version: v0.5.0 build 0052.

Now, everything is visible in SmartGit again. Problem solved - you guys are the best, especially @shelhamer!

---

To search the commit log (across all branches) for the given text:

git log --all --grep='Build 0051'

To search the actual content of commits through a repo's history, use:

git grep 'Build 0051' $(git rev-list --all)

to show all instances of the given text, the containing file name, and the commit sha1.

Finally, as a last resort in case your commit is dangling and not connected to history at all, you can search the reflog itself with the -g flag (short for --walk-reflogs :

git log -g --grep='Build 0051'

EDIT: if you seem to have lost your history, check the reflog as your safety net. Look for Build 0051 in one of the commits listed by

git reflog

You may have simply set your HEAD to a part of history in which the 'Build 0051' commit is not visible, or you may have actually blown it away. The git-ready reflog article may be of help.

To recover your commit from the reflog : do a git checkout of the commit you found (and optionally make a new branch or tag of it for reference)

git checkout 77b1f718d19e5cf46e2fab8405a9a0859c9c2889
# alternative, using reflog (see git-ready link provided)
# git checkout HEAD@{10}
git checkout -b build_0051 # make a new branch with the build_0051 as the tip

---

I put this in my ~/.gitconfig:

[alias]
    find = log --pretty="format:%Cgreen%H %Cblue%s" --name-status --grep

Then I can type "git find string" and I get a list of all the commits containing that string in the message. For example, to find all commits referencing ticket #33:

029a641667d6d92e16deccae7ebdeef792d8336b Added isAttachmentEditable() and isAttachmentViewable() methods. (references #33)
M       library/Dbs/Db/Row/Login.php

a1bccdcd29ed29573d2fb799e2a564b5419af2e2 Add permissions checks for attachments of custom strategies. (references #33).
M       application/controllers/AttachmentController.php

38c8db557e5ec0963a7292aef0220ad1088f518d Fix permissions. (references #33)
M       application/views/scripts/attachment/_row.phtml

041db110859e7259caeffd3fed7a3d7b18a3d564 Fix permissions. (references #33)
M       application/views/scripts/attachment/index.phtml

388df3b4faae50f8a8d8beb85750dd0aa67736ed Added getStrategy() method. (references #33)
M       library/Dbs/Db/Row/Attachment.php

---

git log --grep=<pattern>
            Limit the commits output to ones with log message that matches the
            specified pattern (regular expression).

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