# [PATCH 1/2] (resend) stash bug: stash can lose data in a file removed from the index

4 messages from 2010-04-15 to 2010-04-15. Participants: Charles Bailey, Thomas Rast, Jeff King.
Thread: https://gitlist.dev/t/23465

## Charles Bailey, 2010-04-15 00:24

Subject: [PATCH 1/2] (resend) stash bug: stash can lose data in a file removed from the index
Message-ID: <1271291062-32154-1-git-send-email-charles@hashpling.org>
URL: https://gitlist.dev/e/1271291062-32154-1-git-send-email-charles%40hashpling.org

```
If a file is removed from the index and then modified in the working
tree then stash will discard the working tree file with no way to
recover the changes.

This can might be done in one of a number of ways.

git rm file
vi file              # edit a new version
git stash

or with git mv

git mv file newfile
vi file              # make a new file with the old name
git stash

Signed-off-by: Charles Bailey <charles@hashpling.org>
---
 t/t3903-stash.sh |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 476e5ec..c85bf44 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -228,4 +228,13 @@ test_expect_success 'stash --invalid-option' '
 	test bar,bar2 = $(cat file),$(cat file2)
 '
 
+test_expect_failure 'stash git rm' '
+    git reset --hard &&
+	git rm file &&
+	echo bar7 > file &&
+	git stash &&
+	git stash apply &&
+	test bar7 = $(cat file)
+'
+
 test_done
-- 
1.7.1.rc1.241.g4e72f

```

## Charles Bailey, 2010-04-15 00:24

Subject: [PATCH 2/2] (resend) stash: Don't overwrite files that have gone from the index
Message-ID: <1271291062-32154-2-git-send-email-charles@hashpling.org>
URL: https://gitlist.dev/e/1271291062-32154-2-git-send-email-charles%40hashpling.org
In-Reply-To: <1271291062-32154-1-git-send-email-charles@hashpling.org>

```
---

This patch is deliberately not signed off. It feels kludgy and uses a
non-portable xargs invocation.

It is designed as a starting point for discussion, that is all.

 git-stash.sh |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/git-stash.sh b/git-stash.sh
index 908aab2..9efc544 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -87,6 +87,8 @@ create_stash () {
 			export GIT_INDEX_FILE &&
 			git read-tree -m $i_tree &&
 			git add -u &&
+			{ git diff --quiet --diff-filter=D --cached ||
+				git diff -z --name-only --diff-filter=D --cached | xargs -0 git add --ignore-errors; } &&
 			git write-tree &&
 			rm -f "$TMP-index"
 		) ) ||
-- 
1.7.1.rc1.241.g4e72f

```

## Thomas Rast, 2010-04-15 07:33

Subject: Re: [PATCH 2/2] (resend) stash: Don't overwrite files that have gone from the index
Message-ID: <201004150933.41330.trast@student.ethz.ch>
URL: https://gitlist.dev/e/201004150933.41330.trast%40student.ethz.ch
In-Reply-To: <1271291062-32154-2-git-send-email-charles@hashpling.org>

```
Charles Bailey wrote:
> diff --git a/git-stash.sh b/git-stash.sh
> index 908aab2..9efc544 100755
> --- a/git-stash.sh
> +++ b/git-stash.sh
> @@ -87,6 +87,8 @@ create_stash () {
>  			export GIT_INDEX_FILE &&
>  			git read-tree -m $i_tree &&
>  			git add -u &&
> +			{ git diff --quiet --diff-filter=D --cached ||
> +				git diff -z --name-only --diff-filter=D --cached | xargs -0 git add --ignore-errors; } &&

I think you'll also have to turn it into an 'add -f' invocation since
the file in question could conceivably have been ignored-but-tracked,
and straight 'add' would refuse to re-track it.

(No, I don't have any good ideas on how to get rid of xargs short of
some shell loop...)

-- 
Thomas Rast
trast@{inf,student}.ethz.ch

```

## Jeff King, 2010-04-15 07:38

Subject: Re: [PATCH 2/2] (resend) stash: Don't overwrite files that have gone from the index
Message-ID: <20100415073856.GC27542@coredump.intra.peff.net>
URL: https://gitlist.dev/e/20100415073856.GC27542%40coredump.intra.peff.net
In-Reply-To: <201004150933.41330.trast@student.ethz.ch>

```
On Thu, Apr 15, 2010 at 09:33:40AM +0200, Thomas Rast wrote:

> Charles Bailey wrote:
> > diff --git a/git-stash.sh b/git-stash.sh
> > index 908aab2..9efc544 100755
> > --- a/git-stash.sh
> > +++ b/git-stash.sh
> > @@ -87,6 +87,8 @@ create_stash () {
> >  			export GIT_INDEX_FILE &&
> >  			git read-tree -m $i_tree &&
> >  			git add -u &&
> > +			{ git diff --quiet --diff-filter=D --cached ||
> > +				git diff -z --name-only --diff-filter=D --cached | xargs -0 git add --ignore-errors; } &&
> 
> I think you'll also have to turn it into an 'add -f' invocation since
> the file in question could conceivably have been ignored-but-tracked,
> and straight 'add' would refuse to re-track it.
> 
> (No, I don't have any good ideas on how to get rid of xargs short of
> some shell loop...)

It should probably use update-index, which has a --stdin mode, and which
doesn't care about ignores.

-Peff

PS I have not looked carefully into this issue yet, so I don't know if
   the patch actually does the right thing or not.

```