![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
index ca13266b113c058af9eee3052a404521defee094..08d1310bf5fc5590ada1ee5b2af77d361ff4d874 100644 (file)
-------------------------------------------------
If you run "git branch" at this point, you'll see that git has
-temporarily moved you to a new branch named "bisect". This branch
-points to a commit (with commit id 65934...) that is reachable from
-"master" but not from v2.6.18. Compile and test it, and see whether
-it crashes. Assume it does crash. Then:
+temporarily moved you in "(no branch)". HEAD is now detached from any
+branch and points directly to a commit (with commit id 65934...) that
+is reachable from "master" but not from v2.6.18. Compile and test it,
+and see whether it crashes. Assume it does crash. Then:
-------------------------------------------------
$ git bisect bad
$ git bisect reset
-------------------------------------------------
-to return you to the branch you were on before and delete the
-temporary "bisect" branch.
+to return you to the branch you were on before.
Note that the version which git-bisect checks out for you at each
point is just a suggestion, and you're free to try a different
-------------------------------------------------
which will run gitk and label the commit it chose with a marker that
-says "bisect". Chose a safe-looking commit nearby, note its commit
+says "bisect". Choose a safe-looking commit nearby, note its commit
id, and check it out with:
-------------------------------------------------
then test, run "bisect good" or "bisect bad" as appropriate, and
continue.
+Instead of "git bisect visualize" and then "git reset --hard
+fb47ddb2db...", you might just want to tell git that you want to skip
+the current commit:
+
+-------------------------------------------------
+$ git bisect skip
+-------------------------------------------------
+
+In this case, though, git may not eventually be able to tell the first
+bad one between some first skipped commits and a latter bad commit.
+
+There are also ways to automate the bisecting process if you have a
+test script that can tell a good from a bad commit. See
+linkgit:git-bisect[1] for more information about this and other "git
+bisect" features.
+
[[naming-commits]]
Naming commits
--------------
backup files made by your editor. Of course, 'not' tracking files with git
is just a matter of 'not' calling "`git-add`" on them. But it quickly becomes
annoying to have these untracked files lying around; e.g. they make
-"`git add .`" and "`git commit -a`" practically useless, and they keep
-showing up in the output of "`git status`".
+"`git add .`" practically useless, and they keep showing up in the output of
+"`git status`".
You can tell git to ignore certain files by creating a file called .gitignore
in the top level of your working directory, with contents such as:
$ git diff --theirs file.txt # same as the above.
-------------------------------------------------
-The linkgit:git-log[1] and gitk[1] commands also provide special help
+The linkgit:git-log[1] and linkgit:gitk[1] commands also provide special help
for merges:
-------------------------------------------------
$ mv proj.git /home/you/public_html/proj.git
$ cd proj.git
$ git --bare update-server-info
-$ chmod a+x hooks/post-update
+$ mv hooks/post-update.sample hooks/post-update
-------------------------------------------------
(For an explanation of the last two lines, see
This can happen, for example, if you:
- - use `git reset --hard` to remove already-published commits, or
- - use `git commit --amend` to replace already-published commits
+ - use `git-reset --hard` to remove already-published commits, or
+ - use `git-commit --amend` to replace already-published commits
(as in <<fixing-a-mistake-by-rewriting-history>>), or
- - use `git rebase` to rebase any already-published commits (as
+ - use `git-rebase` to rebase any already-published commits (as
in <<using-git-rebase>>).
You may force git-push to perform the update anyway by preceding the
It's also possible for a push to fail in this way when other people have
the right to push to the same repository. In that case, the correct
-solution is to retry the push after first updating your work by either a
-pull or a fetch followed by a rebase; see the
+solution is to retry the push after first updating your work: either by a
+pull, or by a fetch followed by a rebase; see the
<<setting-up-a-shared-repository,next section>> and
linkgit:gitcvs-migration[7] for more.
changes are in a specific branch, use:
-------------------------------------------------
-$ git log linux..branchname | git-shortlog
+$ git log linux..branchname | git shortlog
-------------------------------------------------
To see whether it has already been merged into the test or release branches,
-------------------------------------------------
This will remove each of your commits from mywork, temporarily saving
-them as patches (in a directory named ".dotest"), update mywork to
+them as patches (in a directory named ".git/rebase-apply"), update mywork to
point at the latest version of origin, then apply each of the saved
patches to the new mywork. The result will look like:
................................................
In the process, it may discover conflicts. In that case it will stop
-and allow you to fix the conflicts; after fixing conflicts, use "git
-add" to update the index with those contents, and then, instead of
+and allow you to fix the conflicts; after fixing conflicts, use "git-add"
+to update the index with those contents, and then, instead of
running git-commit, just run
-------------------------------------------------
git fetch and fast-forwards
---------------------------
-In the previous example, when updating an existing branch, "git
-fetch" checks to make sure that the most recent commit on the remote
+In the previous example, when updating an existing branch, "git-fetch"
+checks to make sure that the most recent commit on the remote
branch is a descendant of the most recent commit on your copy of the
branch before updating your copy of the branch to point at the new
commit. Git calls this process a <<fast-forwards,fast forward>>.
o--o--o <-- new head of the branch
................................................
-In this case, "git fetch" will fail, and print out a warning.
+In this case, "git-fetch" will fail, and print out a warning.
In that case, you can still force git to update to the new head, as
described in the following section. However, note that in the
$ git config remote.example.fetch +master:ref/remotes/example/master
-------------------------------------------------
-Don't do this unless you're sure you won't mind "git-fetch" possibly
-throwing away commits on mybranch.
+Don't do this unless you're sure you won't mind "git fetch" possibly
+throwing away commits on 'example/master'.
Also note that all of the above configuration can be performed by
directly editing the file .git/config instead of using
"tag".
- A <<def_blob_object,"blob" object>> is used to store file data.
-- A <<def_tree_object,"tree" object>> is an object that ties one or more
+- A <<def_tree_object,"tree" object>> ties one or more
"blob" objects into a directory structure. In addition, a tree object
can refer to other tree objects, thus creating a directory hierarchy.
- A <<def_commit_object,"commit" object>> ties such directory hierarchies
A tag object contains an object, object type, tag name, the name of the
person ("tagger") who created the tag, and a message, which may contain
-a signature, as can be seen using the linkgit:git-cat-file[1]:
+a signature, as can be seen using linkgit:git-cat-file[1]:
------------------------------------------------
$ git cat-file tag v1.5.0
to remove any of the "loose" objects that are now contained in the
pack. This will also remove any unreferenced objects (which may be
-created when, for example, you use "git reset" to remove a commit).
+created when, for example, you use "git-reset" to remove a commit).
You can verify that the loose objects are gone by looking at the
.git/objects directory or by running
pointer itself just doesn't, since you replaced it with another one.
There are also other situations that cause dangling objects. For
-example, a "dangling blob" may arise because you did a "git add" of a
+example, a "dangling blob" may arise because you did a "git-add" of a
file, but then, before you actually committed it and made it part of the
bigger picture, you changed something else in that file and committed
that *updated* thing--the old state that you added originally ends up
almost always the result of either being a half-way mergebase (the blob
will often even have the conflict markers from a merge in it, if you
have had conflicting merges that you fixed up by hand), or simply
-because you interrupted a "git fetch" with ^C or something like that,
+because you interrupted a "git-fetch" with ^C or something like that,
leaving _some_ of the new objects in the object database, but just
dangling and useless.
$ git init
$ for i in a b c d
do
- git submodule add ~/git/$i
+ git submodule add ~/git/$i $i
done
-------------------------------------------------
. .. .git .gitmodules a b c d
-------------------------------------------------
-The `git-submodule add` command does a couple of things:
+The `git-submodule add <repo> <path>` command does a couple of things:
-- It clones the submodule under the current directory and by default checks out
- the master branch.
+- It clones the submodule from <repo> to the given <path> under the
+ current directory and by default checks out the master branch.
- It adds the submodule's clone path to the linkgit:gitmodules[5] file and
adds this file to the index, ready to be committed.
- It adds the submodule's current commit ID to the index, ready to be
considering a removed file to be a valid thing, and if the file really
does not exist any more, it will update the index accordingly.
-As a special case, you can also do `git-update-index --refresh`, which
+As a special case, you can also do `git update-index --refresh`, which
will refresh the "stat" information of each index to match the current
stat information. It will 'not' update the object status itself, and
it will only update the fields that are used to quickly test whether
Tying it all together
~~~~~~~~~~~~~~~~~~~~~
-To commit a tree you have instantiated with "git-write-tree", you'd
+To commit a tree you have instantiated with "git write-tree", you'd
create a "commit" object that refers to that tree and the history
behind it--most notably the "parent" commits that preceded it in
history.
which will do all trivial merge operations for you directly in the
index file, and you can just write the result out with
-`git-write-tree`.
+`git write-tree`.
[[merging-multiple-trees-2]]
$ git update-index hello.c
-------------------------------------------------
-When a path is in unmerged state, running `git-update-index` for
+When a path is in the "unmerged" state, running `git-update-index` for
that path tells git to mark the path resolved.
The above is the description of a git merge at the lowest level,
to help you understand what conceptually happens under the hood.
-In practice, nobody, not even git itself, uses three `git-cat-file`
-for this. There is `git-merge-index` program that extracts the
+In practice, nobody, not even git itself, runs `git-cat-file` three times
+for this. There is a `git-merge-index` program that extracts the
stages to temporary files and calls a "merge" script on it:
-------------------------------------------------
README in that revision uses the word "changeset" to describe what we
now call a <<def_commit_object,commit>>.
-Also, we do not call it "cache" any more, but "index", however, the
+Also, we do not call it "cache" any more, but rather "index"; however, the
file is still called `cache.h`. Remark: Not much reason to change it now,
especially since there is no good single name for it anyway, because it is
basically _the_ header file which is included by _all_ of Git's C sources.
This is just to get you into the groove for the most libified part of Git:
the revision walker.
-Basically, the initial version of `git log` was a shell script:
+Basically, the initial version of `git-log` was a shell script:
----------------------------------------------------------------
$ git-rev-list --pretty $(git-rev-parse --default HEAD "$@") | \
`git show v1.3.0{tilde}155^2{tilde}4` and scroll down to that function (note that you
no longer need to call `setup_pager()` directly).
-Nowadays, `git log` is a builtin, which means that it is _contained_ in the
+Nowadays, `git-log` is a builtin, which means that it is _contained_ in the
command `git`. The source side of a builtin is
- a function called `cmd_<bla>`, typically defined in `builtin-<bla>.c`,
_not_ named like the `.c` file in which they live have to be listed in
`BUILT_INS` in the `Makefile`.
-`git log` looks more complicated in C than it does in the original script,
+`git-log` looks more complicated in C than it does in the original script,
but that allows for a much greater flexibility and performance.
Here again it is a good point to take a pause.
So, think about something which you are interested in, say, "how can I
access a blob just knowing the object name of it?". The first step is to
find a Git command with which you can do it. In this example, it is either
-`git show` or `git cat-file`.
+`git-show` or `git-cat-file`.
-For the sake of clarity, let's stay with `git cat-file`, because it
+For the sake of clarity, let's stay with `git-cat-file`, because it
- is plumbing, and