Re: [PATCH v2 04/23] rebase -i: hide interactive command messages in verbose mode

Hi Thomas,

Thomas Rast writes:

Fabian Ruch [off-list ref] writes:

quoted

@@ -923,6 +923,8 @@ EOF
 	;;
 esac
 
+mkdir -p "$state_dir" || die "Could not create temporary $state_dir"
+
 git var GIT_COMMITTER_IDENT >/dev/null ||
 	die "You need to set your committer info first"
 

@@ -938,7 +940,6 @@ then
 fi
 
 orig_head=$(git rev-parse --verify HEAD) || die "No HEAD?"
-mkdir -p "$state_dir" || die "Could not create temporary $state_dir"
 
 : > "$state_dir"/interactive || die "Could not mark as interactive"
 write_basic_state

Why this change?  I can't figure out how it relates to the output
change.

Creating the state directory a few steps earlier into
'git_rebase__interactive' is necessary because the changed definition of
'output' needs it for 'editor.sh'. This change was triggered by a
failing test case that used the <branch> argument with git-rebase. The
'git checkout <branch>', which is executed if 'switch_to' is set to
<branch>, is wrapped into an 'output' line and 'output' failed because
it wasn't able to create 'editor.sh'.

The state directory (of git-rebase--interactive!) is now created
directly after the case expression that handles --continue, --skip and
--edit-todo. They all assume the existence of the state directory and
either jump into 'do_rest' or 'exit' immediately, that is creating the
directory earlier would make the options handling code somewhat
incorrect and would not change anything for the start sequence of
git-rebase--interactive.

The patch message now reads as follows (with the reference to 7725cb5 in
the second paragraph and the complete third paragraph added):

rebase -i: hide interactive command messages in verbose mode

git-rebase--interactive prints summary messages of the commits it
creates in the final history only if the `--verbose` option is
specified by the user and suppresses them otherwise. This behaviour
is implemented by wrapping git-commit calls in a shell function named
`output` which redirects stderr to stdout, captures stdout in a shell
variable and ignores its contents unless the command exits with an
error status.

The command lines used to implement the to-do list commands `reword`
and `squash` print diagnostic messages even in non-verbose mode. The
reason for this inconsistency is that both commands launch the log
message editor which usually requires a working terminal attached to
stdin. Wrapping the `reword` and `squash` command lines in `output`
would seemingly freeze the terminal (see commit 7725cb5, "rebase -i:
fix reword when using a terminal editor"). Temporarily redirect the
editor output to a third file descriptor in order to ship it around
the capture stream. Wrap the remaining git-commit command lines in
the new `output`.

In order to temporarily redirect the editor output, the new
definition of `output` creates a script in the state directory to be
used as `GIT_EDITOR`. Make sure the state directory exists before
`output` is called for the first time.

fake_editor prints the to-do list before and after applying the
`FAKE_LINES` rewrite rules to it. Redirect this debug output to
stderr so that it does not interfere with the git-rebase status
output. Add test.

   Fabian