git-gui - remove obsolete Cygwin specific code

In the current git release, git-gui runs on Cygwin without enabling any
of git-gui's Cygwin specific code.  This happens as the Cygwin specific
code in git-gui was (mostly) written in 2007-2008 to work with Cygwin's
then supplied Tcl/Tk which was an incompletely ported variant of the
8.4.1 Windows Tcl/Tk code.  In March, 2012, that 8.4.1 package was
replaced with a full port based upon the upstream unix/X11 code,
since maintained up to date. The two Tcl/Tk packages are completely
incompatible, and have different signatures.

When Cygwin's Tcl/Tk signature changed in 2012, git-gui no longer
detected Cygwin, so did not enable Cygwin specific code, and the POSIX
environment provided by Cygwin since 2012 supported git-gui as a generic
unix. Thus, no-one apparently noticed the existence of incompatible
Cygwin specific code.

However, since commit c5766eae6f in the git-gui source tree
(https://github.com/prati0100/git-gui, master at a5005ded), and not yet
pulled into the git repository, the is_Cygwin function does detect
Cygwin using the unix/X11 Tcl/Tk.  The Cygwin specific code is enabled,
causing use of Windows rather than unix pathnames, and enabling
incorrect warnings about environment variables that were relevant only
to the old Tcl/Tk.  The end result is that (upstream) git-gui is now
incompatible with Cygwin.

So, delete Cygwin specific code (code protected by "if is_Cygwin") that
is not needed in any form to work with the unix/X11 Tcl/Tk.

Cygwin specific code required to enable file browsing and shortcut
creation is not addressed in this patch, does not currently work, and
invocation of those items may leave git-gui in a confused state.

Signed-off-by: Mark Levedahl <mlevedahl@gmail.com>
Acked-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Pratyush Yadav <me@yadavpratyush.com>
2 files changed
tree: 6c95de56f66b753d08161fc20ec9cf8df73404cb
  1. lib/
  2. macosx/
  3. po/
  4. windows/
  5. .gitattributes
  6. .gitignore
  7. git-gui--askpass
  8. git-gui.sh
  9. GIT-VERSION-GEN
  10. Makefile
  11. README.md
README.md

Git GUI - A graphical user interface for Git

Git GUI allows you to use the Git source control management tools via a GUI. This includes staging, committing, adding, pushing, etc. It can also be used as a blame viewer, a tree browser, and a citool (make exactly one commit before exiting and returning to shell). More details about Git GUI can be found in its manual page by either running man git-gui, or by visiting the online manual page.

Git GUI was initially written by Shawn O. Pearce, and is distributed with the standard Git installation.

Building and installing

You need to have the following dependencies installed before you begin:

  • Git
  • Tcl
  • Tk
  • wish
  • Gitk (needed for browsing history)
  • msgfmt

Most of Git GUI is written in Tcl, so there is no compilation involved. Still, some things do need to be done (mostly some substitutions), so you do need to “build” it.

You can build Git GUI using:

make

And then install it using:

make install

You probably need to have root/admin permissions to install.

Contributing

The project is currently maintained by Pratyush Yadav over at https://github.com/prati0100/git-gui. Even though the project is hosted at GitHub, the development does not happen over GitHub Issues and Pull Requests. Instead, an email based workflow is used. The Git mailing list git@vger.kernel.org is where the patches are discussed and reviewed.

More information about the Git mailing list and instructions to subscribe can be found here.

Sending your changes

Since the development happens over email, you need to send in your commits in text format. Commits can be converted to emails via the two tools provided by Git: git-send-email and git-format-patch.

You can use git-format-patch to generate patches in mbox format from your commits that can then be sent via email. Let's say you are working on a branch called ‘foo’ that was created on top of ‘master’. You can run:

git format-patch -o output_dir master..foo

to convert all the extra commits in ‘foo’ into a set of patches saved in the folder output_dir.

If you are sending multiple patches, it is recommended to include a cover letter. A cover letter is an email explaining in brief what the series is supposed to do. A cover letter template can be generated by passing --cover-letter to git-format-patch.

After you send your patches, you might get a review suggesting some changes. Make those changes, and re-send your patch(es) in reply to the first patch of your initial version. Also please mention the version of the patch. This can be done by passing -v X to git-format-patch, where ‘X’ is the version number of the patch(es).

Using git-send-email

You can use git-send-email to send patches generated via git-format-patch. While you can directly send patches via git-send-email, it is recommended that you first use git-format-patch to generate the emails, audit them, and then send them via git-send-email.

A pretty good guide to configuring and using git-send-email can be found here.

Using your email client

If your email client supports sending mbox format emails, you can use git-format-patch to get an mbox file for each commit, and then send them. If there is more than one patch in the series, then all patches after the first patch (or the cover letter) need to be sent as replies to the first. git-send-email does this by default.

Using GitGitGadget

Since some people prefer a GitHub pull request based workflow, they can use GitGitGadget to send in patches. The tool was originally written for sending patches to the Git project, but it now also supports sending patches for git-gui.

Instructions for using GitGitGadget to send git-gui patches, courtesy of Johannes Schindelin:

If you don't already have a fork of the git/git repo, you need to make one. Then clone your fork:

git clone https://github.com/<your-username>/git

Then add GitGitGadget as a remote:

git remote add gitgitgadget https://github.com/gitgitgadget/git

Then fetch the git-gui branch:

git fetch gitgitgadget git-gui/master

Then create a new branch based on git-gui/master:

git checkout -b <your-branch-name> git-gui/master

Make whatever commits you need to, push them to your fork, and then head over to https://github.com/gitgitgadget/git/pulls and open a Pull Request targeting git-gui/master.

GitGitGadget will welcome you with a (hopefully) helpful message.

Signing off

You need to sign off your commits before sending them to the list. You can do that by passing the -s option to git-commit. You can also use the “Sign Off” option in Git GUI.

A sign-off is a simple ‘Signed-off-by: A U Thor <author@example.com>’ line at the end of the commit message, after your explanation of the commit.

A sign-off means that you are legally allowed to send the code, and it serves as a certificate of origin. More information can be found at developercertificate.org.

Responding to review comments

It is quite likely your patches will get review comments. Those comments are sent on the Git mailing list as replies to your patch, and you will usually be Cc'ed in those replies.

You are expected to respond by either explaining your code further to convince the reviewer what you are doing is correct, or acknowledge the comments and re-send the patches with those comments addressed.

Some tips for those not familiar with communication on a mailing list:

  • Use only plain text emails. No HTML at all.
  • Wrap lines at around 75 characters.
  • Do not send attachments. If you do need to send some files, consider using a hosting service, and paste the link in your email.
  • Do not top post.
  • Always “reply all”. Keep all correspondents and the list in Cc. If you reply directly to a reviewer, and not Cc the list, other people would not be able to chime in.