annotate tests/test-extdiff.out @ 11769:ca6cebd8734e stable

dirstate: ignore symlinks when fs cannot handle them (issue1888)

When the filesystem cannot handle the executable bit, we currently
ignore it completely when looking for modified files. Similarly, it is
impossible to set or clear the bit when the filesystem ignores it.

This patch makes Mercurial treat symbolic links the same way.

Symlinks are a little different since they manifest themselves as
small files containing a filename (the symlink target). On Windows,
these files show up as regular files, and on Linux and Mac they show
up as real symlinks.

Issue1888 presents a case where the symlink files are better ignored
from the Windows side. A Linux client creates symlinks in a working
copy which is shared over a network between Linux and Windows clients.

The Samba server is helpful and defererences the symlink when the
Windows client looks at it. This means that Mercurial on the Windows
side sees file content instead of a file name in the symlink, and
hence flags the link as modified. Ignoring the change would be much
more helpful, similarly to how Mercurial does not report any changes
when executable bits are ignored in a checkout on Windows.

An initial checkout of a symbolic link on a file system that cannot
handle symbolic links will still result in a regular file containing
the target file name as its content. Sharing such a checkout with a
Linux client will not turn the file into a symlink automatically, but
'hg revert' can fix that. After the revert, the Windows client will
see the correct file content (provided by the Samba server when it
follows the link on the Linux side) and otherwise ignore the change.

Running 'hg perfstatus' 10 times gives these results:

  Before:          After:
  min: 0.544703    min: 0.546549
  med: 0.547592    med: 0.548881
  avg: 0.549146    avg: 0.548549
  max: 0.564112    max: 0.551504

The median time is increased about 0.24%.

adding a
adding b
Only in a: a
Only in a: b
diffing a.000000000000 a
hg falabala [OPTION]... [FILE]...

use 'echo' to diff repository (or selected files)

    Show differences between revisions for the specified files, using the
    'echo' program.

    When two revision arguments are given, then changes are shown between
    those revisions. If only one revision is specified then that revision is
    compared to the working directory, and, when no revisions are specified,
    the working directory files are compared to its parent.

options:

 -o --option OPT [+]       pass option to comparison program
 -r --rev REV [+]          revision
 -c --change REV           change made by revision
 -I --include PATTERN [+]  include names matching the given patterns
 -X --exclude PATTERN [+]  exclude names matching the given patterns

[+] marked option can be specified multiple times

use "hg -v help falabala" to show global options
diffing a.8a5febb7f867/a a.34eed99112ab/a
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
created new head
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
diffing a.2a13a4d2da36/a [tmp]/test-extdiff/a/a
diffing a.8a5febb7f867/a a.34eed99112ab/a
diffing a.2a13a4d2da36/a a.46c0e4daeb72/a
diff-like tools yield a non-zero exit code

% test extdiff of multiple files in tmp dir:
% diff in working directory, before
diff --git a/a b/a
--- a/a
+++ b/a
@@ -1,1 +1,1 @@
-a
+changed
diff --git a/b b/b
old mode 100644
new mode 100755
--- a/b
+++ b/b
@@ -1,1 +1,1 @@
-b
+changed
% edit with extdiff -p
% diff in working directory, after
diff --git a/a b/a
--- a/a
+++ b/a
@@ -1,1 +1,2 @@
-a
+changed
+edited
diff --git a/b b/b
old mode 100644
new mode 100755
--- a/b
+++ b/b
@@ -1,1 +1,2 @@
-b
+changed
+edited

% test extdiff with --option
this a.8a5febb7f867/a a.34eed99112ab/a
diffing this a.8a5febb7f867/a a.34eed99112ab/a