Re: Git clean enumerates ignored directories (since 2.27)

[Elijah Newren <newren@gmail.com>]

On Thu, Apr 15, 2021 at 1:51 AM Jeff King <peff@peff.net> wrote:
>
> On Wed, Apr 14, 2021 at 10:56:14PM +0000, brian m. carlson wrote:
>
> > ----
> > #!/bin/sh
> >
> > git init test-repo
> > cd test-repo
> > longname="directory"
> > touch "$longname.txt"
> > last=400
> > for x in $(seq 1 $last); do
> >   mkdir "x$longname$x"
> >   mv directory* "x$longname$x"
> >   mv "x$longname$x" "$longname$x"
> > done
> > git clean -ffdxn -e directory$last
> > ----
> >
> > When it fails, it will complain that it wasn't able to open the
> > directory.  It still exits zero, however.
> >
> > I haven't bisected this, so I don't know if those patches are related to
> > the problem or not.  I'm a little short on time today to investigate
> > further, but hopefully this can get someone on the right path with a
> > modified version and git bisect run if nothing else.
>
> It bisects to 8d92fb2927 (dir: replace exponential algorithm with a
> linear one, 2020-04-01). I won't pretend to understand everything going
> on in that commit, though.

I've got a patch series to fix this and another traversal problem, and
the tests pass on all platforms.  Wahoo!

BUT!

On alpine linux-musl, I get an "error: Tests passed but test cleanup
failed; aborting", which makes it report as a failed build.  I'm not
sure how to fix it and am asking for ideas.

Apparently the deeply nested directory hierarchy cannot be removed on
that platform with a simple "rm -rf $dirname".  It throws a "rm: can't
stat '/__w/git/git/t/trash
directory.t7300-clean/avoid-traversing-deep-hierarchy/directory400/directory399/directory398/.....(you
get the idea)....': Filename too long" error message.[1]

Adding a "test_when_finished find directory400 -delete" also gives a
"Filename too long" message followed by a lot of "Directory not empty"
messages.[2]

Anyone have any bright ideas about how to tweak this test?  See [3]
for the current incarnation of the code, which was basically taken
from Brian's sample testcase.

[1] https://github.com/git/git/pull/1020/checks?check_run_id=2523414561
[2] https://github.com/git/git/pull/1020/checks?check_run_id=2523594095
[3] https://github.com/git/git/pull/1020