Re: [PATCH v2 4/4] ls-files: fix bug when recursing with relative pathspec

> On Tue, Mar 14, 2017 at 3:11 PM, Brandon Williams <bmwill@google.com> wrote:
> > When using the --recurse-submodules flag with a relative pathspec which
> > includes "..", an error is produced inside the child process spawned for a
> > submodule.  When creating the pathspec struct in the child, the ".." is
> > interpreted to mean "go up a directory" which causes an error stating that the
> > path ".." is outside of the repository.
> >
> > While it is true that ".." is outside the scope of the submodule, it is
> > confusing to a user who originally invoked the command where ".." was indeed
> > still inside the scope of the superproject.  Since the child process launched
> > for the submodule has some context that it is operating underneath a
> > superproject, this error could be avoided.
> >
> > This patch fixes the bug by passing the 'prefix' to the child process.  Now
> > each child process that works on a submodule has two points of reference to the
> > superproject: (1) the 'super_prefix' which is the path from the root of the
> > superproject down to root of the submodule and (2) the 'prefix' which is the
> > path from the root of the superproject down to the directory where the user
> > invoked the git command.
> >
> > With these two pieces of information a child process can correctly interpret
> > the pathspecs provided by the user as well as being able to properly format its
> > output relative to the directory the user invoked the original command from.
> >
> > Signed-off-by: Brandon Williams <bmwill@google.com>
> > ---
> >  builtin/ls-files.c                     | 41 +++++++++++++++++-----------------
> >  t/t3007-ls-files-recurse-submodules.sh | 39 ++++++++++++++++++++++++++++++++
> >  2 files changed, 60 insertions(+), 20 deletions(-)
> >
> > diff --git a/builtin/ls-files.c b/builtin/ls-files.c
> > index 1c0f057d0..d449e46db 100644
> > --- a/builtin/ls-files.c
> > +++ b/builtin/ls-files.c
> > @@ -30,7 +30,7 @@ static int line_terminator = '\n';
> >  static int debug_mode;
> >  static int show_eol;
> >  static int recurse_submodules;
> > -static struct argv_array submodules_options = ARGV_ARRAY_INIT;
> > +static struct argv_array submodule_options = ARGV_ARRAY_INIT;
> >
> >  static const char *prefix;
> >  static const char *super_prefix;
> > @@ -172,20 +172,27 @@ static void show_killed_files(struct dir_struct *dir)
> >  /*
> >   * Compile an argv_array with all of the options supported by --recurse_submodules
> >   */
> > -static void compile_submodule_options(const struct dir_struct *dir, int show_tag)
> > +static void compile_submodule_options(const char **argv,
> > +                                     const struct dir_struct *dir,
> > +                                     int show_tag)
> >  {
> >         if (line_terminator == '\0')
> > -               argv_array_push(&submodules_options, "-z");
> > +               argv_array_push(&submodule_options, "-z");
> >         if (show_tag)
> > -               argv_array_push(&submodules_options, "-t");
> > +               argv_array_push(&submodule_options, "-t");
> >         if (show_valid_bit)
> > -               argv_array_push(&submodules_options, "-v");
> > +               argv_array_push(&submodule_options, "-v");
> >         if (show_cached)
> > -               argv_array_push(&submodules_options, "--cached");
> > +               argv_array_push(&submodule_options, "--cached");
> >         if (show_eol)
> > -               argv_array_push(&submodules_options, "--eol");
> > +               argv_array_push(&submodule_options, "--eol");
> >         if (debug_mode)
> > -               argv_array_push(&submodules_options, "--debug");
> > +               argv_array_push(&submodule_options, "--debug");
> 
> Up to here we only rename a variable? If you want to help reviewers,
> please separate this into two patches. One refactoring, stating it doesn't
> change behavior; and the other adding the behavioral changes.

> 
> > +
> > +       /* Add Pathspecs */
> > +       argv_array_push(&submodule_options, "--");
> > +       for (; *argv; argv++)
> > +               argv_array_push(&submodule_options, *argv);
> >  }