Re: git-gui patch staging errors

[Pratyush Yadav <me@yadavpratyush.com>]

Hi,

Sorry for the late reply.

On 12/05/20 01:42PM, J. Paul Reed wrote:
> 
> Hey Richard,

You replied to the wrong person ;-)

> Using your test case, I still get the error (which is, specifically an
> error dialog saying:
> 
>    Failed to stage selected line.
> 
>    error: patch failed: glacierupload.sh:55
>    error:glacierupload.sh: patch does not apply
> 
> Note that I'm highlighting the change in the source code, then
> right-clicking it and selecting "Stage lines for commit." ("Stage hunk for
> commit" also results in the error.)
> 
> If I stage the entire file by clicking on it in the upper-lefthand pane,
> things work fine.
> 
> This is a Gentoo box, so I wonder I happened to build Tcl without the
> appropriate unicode support (that one would find in most package-based
> distros)?
> 
> In briefly digging a bit more, it would seem that git gui is foisting the
> work onto "git apply" to create a patch and stage it? (If I'm reading the
> source correctly, It looks like the error dialog title is from
> https://github.com/prati0100/git-gui/blob/master/lib/diff.tcl#L700

You are close, but not quite there. We don't use "git apply" to _create_ 
a patch. We create the patch ourselves, and then pass it to git apply to 
stage/unstage the lines selected.

I suspect it is some encoding mismatch. Can you apply this patch below 
and send what the output is?

-- 8< --
diff --git a/lib/diff.tcl b/lib/diff.tcl
index 871ad48..6226a89 100644
--- a/lib/diff.tcl
+++ b/lib/diff.tcl
@@ -851,8 +851,13 @@ proc apply_or_revert_range_or_line {x y revert} {
 		set first_l [$ui_diff index "$next_l + 1 lines"]
 	}
 
+	puts "Diff we will send to git-apply:"
+	puts -nonewline "$current_diff_header"
+	puts -nonewline "$wholepatch"
+
 	if {[catch {
 		set enc [get_path_encoding $current_diff_path]
+		puts "\nEncoding: $enc"
 		set p [eval git_write $apply_cmd]
 		fconfigure $p -translation binary -encoding $enc
 		puts -nonewline $p $current_diff_header
-- >8 --
 
> and then the error strings that populate the dialog are bubbled up from git
> apply.
> 
> Any ideas on what would make "git apply" potentially choke? I wonder if it
> has to do with a mixed file encoding?

git-gui not preparing the patch text properly would be a prime 
candidate.
 
> I tried setting both:
> 
> core.checkRoundTripEncoding true 
> gui.encoding utf-8
> 
> on that repo; git gui still errored out in the same way. 
> 
> I also tried changing gui.encoding to utf-16; no dice...
> 
> To reiterate, git add -i worked fine...

-- 
Regards,
Pratyush Yadav