% git format-patch -M origin..
0001-Rename-Leon-Brocard-to-Orange-Brocard.patch
+Or for a lot of changes, e.g. from a topic branch:
+
+ % git format-patch --stdout -M origin.. > topic-branch-changes.patch
+
You should now send an email to
L<perlbug@perl.org|mailto:perlbug@perl.org> with a description of your
changes, and include this patch file as an attachment. In addition to
it carefully, many questions are answered directly by the git status
output.
-=head2 Using git to send patch emails
-
-Please read L<perlhack> first in order to figure out where your patches
-should be sent.
-
-In your ~/git/perl repository, set the destination email to perl's bug
-tracker:
-
- $ git config sendemail.to perlbug@perl.org
-
-Or maybe perl5-porters:
-
- $ git config sendemail.to perl5-porters@perl.org
-
-Then you can use git directly to send your patch emails:
+=head2 Sending patch emails
- $ git send-email 0001-Rename-Leon-Brocard-to-Orange-Brocard.patch
+After you've generated your patch you should sent it to either
+perlbug@perl.org or perl5-porters@perl.org (as discussed L<in the
+previous section|/"Patch workflow"> with a normal mail client as an
+attachment, along with a description of the patch.
-You may need to set some configuration variables for your particular
-email service provider. For example, to set your global git config to
-send email via a gmail account:
+You B<must not> use git-send-email(1) to send patches generated with
+git-format-patch(1). The RT ticketing system living behind
+perlbug@perl.org does not respect the inline contents of E-Mails,
+sending an inline patch to RT guarantees that your patch will be
+destroyed.
- $ git config --global sendemail.smtpserver smtp.gmail.com
- $ git config --global sendemail.smtpssl 1
- $ git config --global sendemail.smtpuser YOURUSERNAME@gmail.com
-
-With this configuration, you will be prompted for your gmail password
-when you run 'git send-email'. You can also configure
-C<sendemail.smtppass> with your password if you don't care about having
-your password in the .gitconfig file.
+Someone may download your patch from RT, which will result in the
+subject (the first line of the commit message) being omitted. See RT
+#74192 and commit a4583001 for an example. Alternatively someone may
+apply your patch from RT after it arrived in their mailbox, by which
+time RT will have modified the inline content of the message. See RT
+#74532 and commit f9bcfeac for a bad example of this failure mode.
=head2 A note on derived files
=head2 Bisecting
-C<git> provides a built-in way to determine, with a binary search in
-the history, which commit should be blamed for introducing a given bug.
+C<git> provides a built-in way to determine which commit should be blamed
+for introducing a given bug. C<git bisect> performs a binary search of
+history to locate the first failing commit. It is fast, powerful and
+flexible, but requires some setup and to automate the process an auxiliary
+shell script is needed.
+
+The core provides a wrapper program, F<Porting/bisect.pl>, which attempts to
+simplify as much as possible, making bisecting as simple as running a Perl
+one-liner. For example, if you want to know when this became an error:
+
+ perl -e 'my $a := 2'
+
+you simply run this:
+
+ .../Porting/bisect.pl -e 'my $a := 2;'
+
+Using C<bisect.pl>, with one command (and no other files) it's easy to find
+out
+
+=over 4
-Suppose that we have a script F<~/testcase.pl> that exits with C<0>
-when some behaviour is correct, and with C<1> when it's faulty. You
-need an helper script that automates building C<perl> and running the
-testcase. For an example script, see F<Porting/bisect-example.sh>, which
-you should copy B<outside> of the repository as the bisect process will
-reset the state to a clean checkout as it runs. The instructions below assume
-that you copied it as F<~/run> and then edited as appropriate.
+=item *
+
+Which commit caused this example code to break?
+
+=item *
-This script may return C<125> to indicate that the corresponding commit
-should be skipped. Otherwise, it returns the status of
-F<~/testcase.pl>.
+Which commit caused this example code to start working?
+
+=item *
+
+Which commit added the first file to match this regex?
+
+=item *
+
+Which commit removed the last file to match this regex?
+
+=back
+
+usually without needing to know which versions of perl to use as start and
+end revisions, as F<bisect.pl> automatically searches to find the earliest
+stable version for which the test case passes. Run
+C<Porting/bisect.pl --help> for the full documentation, including how to
+set the C<Configure> and build time options.
+
+If you require more flexibility than F<Porting/bisect.pl> has to offer, you'll
+need to run C<git bisect> yourself. It's most useful to use C<git bisect run>
+to automate the building and testing of perl revisions. For this you'll need
+a shell script for C<git> to call to test a particular revision. An example
+script is F<Porting/bisect-example.sh>, which you should copy B<outside> of
+the repository, as the bisect process will reset the state to a clean checkout
+as it runs. The instructions below assume that you copied it as F<~/run> and
+then edited it as appropriate.
You first enter in bisect mode with:
C<git help bisect> has much more information on how you can tweak your
binary searches.
-=head1 Topic branches and rewriting history
+=head2 Topic branches and rewriting history
Individual committers should create topic branches under
B<yourname>/B<some_descriptive_name>. Other committers should check
% git config --global user.name "Ævar Arnfjörð Bjarmason"
% git config --global user.email avarab@gmail.com
-However if you'd like to override that just for perl then execute then
+However, if you'd like to override that just for perl,
execute something like the following in F<perl>:
% git config user.email avar@cpan.org
The C<fetch> command just updates the C<camel> refs, as the objects
themselves should have been fetched when pulling from C<origin>.
-=head1 Accepting a patch
+=head2 Accepting a patch
If you have received a patch file generated using the above section,
you should try out the patch.
% git checkout blead
% git merge experimental
- % git push
+ % git push origin blead
If you want to delete your temporary branch, you may do so with:
=back
-=head3 On merging and rebasing
+=head2 On merging and rebasing
Simple, one-off commits pushed to the 'blead' branch should be simple
commits that apply cleanly. In other words, you should make sure your
And then push back to the repository:
- % git push
+ % git push origin blead
+
+=head2 Using a smoke-me branch to test changes
+
+Sometimes a change affects code paths which you cannot test on the OSes
+which are directly available to you and it would be wise to have users
+on other OSes test the change before you commit it to blead.
+
+Fortunately, there is a way to get your change smoke-tested on various
+OSes: push it to a "smoke-me" branch and wait for certain automated
+smoke-testers to report the results from their OSes.
+
+The procedure for doing this is roughly as follows (using the example of
+of tonyc's smoke-me branch called win32stat):
+
+First, make a local branch and switch to it:
+
+ % git checkout -b win32stat
+
+Make some changes, build perl and test your changes, then commit them to
+your local branch. Then push your local branch to a remote smoke-me
+branch:
+
+ % git push origin win32stat:smoke-me/tonyc/win32stat
+
+Now you can switch back to blead locally:
+
+ % git checkout blead
+
+and continue working on other things while you wait a day or two,
+keeping an eye on the results reported for your smoke-me branch at
+L<http://perl.develop-help.com/?b=smoke-me/tonyc/win32state>.
+
+If all is well then update your blead branch:
+
+ % git pull
+
+then checkout your smoke-me branch once more and rebase it on blead:
+
+ % git rebase blead win32stat
+
+Now switch back to blead and merge your smoke-me branch into it:
+
+ % git checkout blead
+ % git merge win32stat
+
+As described earlier, if there are many changes on your smoke-me branch
+then you should prepare a merge commit in which to give an overview of
+those changes by using the following command instead of the last
+command above:
+
+ % git merge win32stat --no-ff --no-commit
+
+You should now build perl and test your (merged) changes one last time
+(ideally run the whole test suite, but failing that at least run the
+F<t/porting/*.t> tests) before pushing your changes as usual:
+
+ % git push origin blead
+
+Finally, you should then delete the remote smoke-me branch:
+
+ % git push origin :smoke-me/tonyc/win32stat
+
+(which is likely to produce a warning like this, which can be ignored:
+
+ remote: fatal: ambiguous argument 'refs/heads/smoke-me/tonyc/win32stat':
+ unknown revision or path not in the working tree.
+ remote: Use '--' to separate paths from revisions
+
+) and then delete your local branch:
+
+ % git branch -d win32stat
=head2 A note on camel and dromedary
https://perl5.git.perl.org / perl5.git / blobdiff