[v3] doc: hint about GIT_DEBUGGER in CodingGuidelines
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Message ID 20190523005533.260611-1-emilyshaffer@google.com
State New
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  • [v3] doc: hint about GIT_DEBUGGER in CodingGuidelines
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Commit Message

Emily Shaffer May 23, 2019, 12:55 a.m. UTC
We check for a handy environment variable GIT_DEBUGGER when running via
bin-wrappers/, but this feature is undocumented. Add a hint to how to
use it into the CodingGuidelines (which is where other useful
environment settings like DEVELOPER are documented).

You can use GIT_DEBUGGER to pick gdb by default, or you can hand it your
own debugger if you like to use something else (or if you want custom
flags for gdb). This commit documents that intent within
CodingGuidelines.

Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
---

Since v2, only the commit message has changed. Removed some weak
language to make the commit message read more easily.

 Documentation/CodingGuidelines | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

Eric Sunshine May 23, 2019, 10:09 a.m. UTC | #1
On Wed, May 22, 2019 at 8:56 PM Emily Shaffer <emilyshaffer@google.com> wrote:
> We check for a handy environment variable GIT_DEBUGGER when running via
> bin-wrappers/, but this feature is undocumented. Add a hint to how to
> use it into the CodingGuidelines (which is where other useful
> environment settings like DEVELOPER are documented).
>
> You can use GIT_DEBUGGER to pick gdb by default, or you can hand it your
> own debugger if you like to use something else (or if you want custom
> flags for gdb). This commit documents that intent within
> CodingGuidelines.

This last sentence is repeating what is already stated in the first
paragraph, thus doesn't seem to add value. In fact, the remainder of
the second paragraph seems to be repeating what is in the patch
proper, thus could likely be dropped.

> Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
> ---
> diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
> @@ -412,6 +412,12 @@ For C programs:
> + - You can launch gdb around your program using the shorthand GIT_DEBUGGER.
> +   Run `GIT_DEBUGGER=1 ./bin-wrappers/git foo` to simply use gdb as is, or
> +   run `GIT_DEBUGGER=my-debugger-binary my-args ./bin-wrappers/git foo` to

Don't you need to bind my-debugger-binary and my-args together with
shell quotes? Also, placeholders like these are often ensconced in
angle brackets, so perhaps:

    ... `GIT_DEBUGGER="<debugger> <debugger-args>" ./bin-wrappers/git ...

> +   use your own debugger and arguments. Example: `GIT_DEBUGGER="ddd --gdb"
> +   ./bin-wrappers/git log` (See `wrap-for-bin.sh`.)
Emily Shaffer May 28, 2019, 7:05 p.m. UTC | #2
On Thu, May 23, 2019 at 06:09:17AM -0400, Eric Sunshine wrote:
> On Wed, May 22, 2019 at 8:56 PM Emily Shaffer <emilyshaffer@google.com> wrote:
> > We check for a handy environment variable GIT_DEBUGGER when running via
> > bin-wrappers/, but this feature is undocumented. Add a hint to how to
> > use it into the CodingGuidelines (which is where other useful
> > environment settings like DEVELOPER are documented).
> >
> > You can use GIT_DEBUGGER to pick gdb by default, or you can hand it your
> > own debugger if you like to use something else (or if you want custom
> > flags for gdb). This commit documents that intent within
> > CodingGuidelines.
> 
> This last sentence is repeating what is already stated in the first
> paragraph, thus doesn't seem to add value. In fact, the remainder of
> the second paragraph seems to be repeating what is in the patch
> proper, thus could likely be dropped.

Yes, you're right. Dropped.

> 
> > Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
> > ---
> > diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
> > @@ -412,6 +412,12 @@ For C programs:
> > + - You can launch gdb around your program using the shorthand GIT_DEBUGGER.
> > +   Run `GIT_DEBUGGER=1 ./bin-wrappers/git foo` to simply use gdb as is, or
> > +   run `GIT_DEBUGGER=my-debugger-binary my-args ./bin-wrappers/git foo` to
> 
> Don't you need to bind my-debugger-binary and my-args together with
> shell quotes? Also, placeholders like these are often ensconced in
> angle brackets, so perhaps:
> 
>     ... `GIT_DEBUGGER="<debugger> <debugger-args>" ./bin-wrappers/git ...

Fixed. I did get the dq in the example but missed it with the
placeholders. :) Thanks, good catch.

> > +   use your own debugger and arguments. Example: `GIT_DEBUGGER="ddd --gdb"
> > +   ./bin-wrappers/git log` (See `wrap-for-bin.sh`.)

Patch update to follow. Thanks.

 - Emily

Patch
diff mbox series

diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
index 32210a4386..e99af36df9 100644
--- a/Documentation/CodingGuidelines
+++ b/Documentation/CodingGuidelines
@@ -412,6 +412,12 @@  For C programs:
    must be declared with "extern" in header files. However, function
    declarations should not use "extern", as that is already the default.
 
+ - You can launch gdb around your program using the shorthand GIT_DEBUGGER.
+   Run `GIT_DEBUGGER=1 ./bin-wrappers/git foo` to simply use gdb as is, or
+   run `GIT_DEBUGGER=my-debugger-binary my-args ./bin-wrappers/git foo` to
+   use your own debugger and arguments. Example: `GIT_DEBUGGER="ddd --gdb"
+   ./bin-wrappers/git log` (See `wrap-for-bin.sh`.)
+
 For Perl programs:
 
  - Most of the C guidelines above apply.