view mercurial/help/diffs.txt @ 34453:40b6d25ed2d5

test-strip: make test compatible with chg

The test was using reposetup which had the logic for stripping
commits. This leads to a situation where if the reposetup was called twice for
an extension (which can happen with chg running), the stripped node would not
be found the second time. Therefore, this commit changes the test to put the
stripping logic inside commands instead of the reposetup. This ensures that the
stripping logic is invoked only when the command is invoked and thus, avoids
any problems.

Test Plan:
Ran the test 'test-strip.t' with and without the '--chg' option.

Differential Revision: https://phab.mercurial-scm.org/D928

Mercurial's default format for showing changes between two versions of
a file is compatible with the unified format of GNU diff, which can be
used by GNU patch and many other standard tools.

While this standard format is often enough, it does not encode the
following information:

- executable status and other permission bits
- copy or rename information
- changes in binary files
- creation or deletion of empty files

Mercurial also supports the extended diff format from the git VCS
which addresses these limitations. The git diff format is not produced
by default because a few widespread tools still do not understand this
format.

This means that when generating diffs from a Mercurial repository
(e.g. with :hg:`export`), you should be careful about things like file
copies and renames or other things mentioned above, because when
applying a standard diff to a different repository, this extra
information is lost. Mercurial's internal operations (like push and
pull) are not affected by this, because they use an internal binary
format for communicating changes.

To make Mercurial produce the git extended diff format, use the --git
option available for many commands, or set 'git = True' in the [diff]
section of your configuration file. You do not need to set this option
when importing diffs in this format or using them in the mq extension.