[PATCH] branch.c: delete size check of newly tracked branch names

[PATCH] branch.c: delete size check of newly tracked branch names

[Jacopo Notarstefano]

Since commit 6f084a56 the length of a newly tracked branch name was limited
to 1019 = 1024 - 7 - 7 - 1 characters, a bound derived by having to store
this name in a char[1024] called key with two strings of length at most 7
and a '\0' character.

This was no longer necessary as of commit a9f2c136, which uses a strbuf
(documented in Documentation/technical/api-strbuf.txt) to store this value.

This patch removes this unneeded check and thus allows for branch names
longer than 1019 characters.

Signed-off-by: Jacopo Notarstefano <jacopo.notarstefano@gmail.com>
---

Submitted as GSoC microproject #3.

 branch.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/branch.c b/branch.c
index 723a36b..05feaff 100644
--- a/branch.c
+++ b/branch.c
@@ -114,10 +114,6 @@ static int setup_tracking(const char *new_ref, const char *orig_ref,
 	struct tracking tracking;
 	int config_flags = quiet ? 0 : BRANCH_CONFIG_VERBOSE;
 
-	if (strlen(new_ref) > 1024 - 7 - 7 - 1)
-		return error(_("Tracking not set up: name too long: %s"),
-				new_ref);
-
 	memset(&tracking, 0, sizeof(tracking));
 	tracking.spec.dst = (char *)orig_ref;
 	if (for_each_remote(find_tracked_branch, &tracking))
-- 
1.9.0.1.g5abca64

Re: [PATCH] branch.c: delete size check of newly tracked branch names

[Jacopo Notarstefano]

> This patch removes this unneeded check and thus allows for branch names
> longer than 1019 characters.
>

Ach! I amended the commit in my local history to read "Remove this
unneded check and thus allow for branch names longer than 1019
characters", but for some reason git format-patch -1 --signoff isn't
reflecting this change.

Re: [PATCH] branch.c: delete size check of newly tracked branch names

[Duy Nguyen]

On Fri, Feb 28, 2014 at 6:09 PM, Jacopo Notarstefano
<jacopo.notarstefano@gmail.com> wrote:
> Since commit 6f084a56 the length of a newly tracked branch name was limited
> to 1019 = 1024 - 7 - 7 - 1 characters, a bound derived by having to store
> this name in a char[1024] called key with two strings of length at most 7
> and a '\0' character.
>
> This was no longer necessary as of commit a9f2c136, which uses a strbuf
> (documented in Documentation/technical/api-strbuf.txt) to store this value.
>
> This patch removes this unneeded check and thus allows for branch names
> longer than 1019 characters.

Nice. new_ref is passed in install_branch_config() in latest code. I
guess you already made sure this function did not make any assumption
about new_ref's length?

>
> Signed-off-by: Jacopo Notarstefano <jacopo.notarstefano@gmail.com>
> ---
>
> Submitted as GSoC microproject #3.
>
>  branch.c | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/branch.c b/branch.c
> index 723a36b..05feaff 100644
> --- a/branch.c
> +++ b/branch.c
> @@ -114,10 +114,6 @@ static int setup_tracking(const char *new_ref, const char *orig_ref,
>         struct tracking tracking;
>         int config_flags = quiet ? 0 : BRANCH_CONFIG_VERBOSE;
>
> -       if (strlen(new_ref) > 1024 - 7 - 7 - 1)
> -               return error(_("Tracking not set up: name too long: %s"),
> -                               new_ref);
> -
>         memset(&tracking, 0, sizeof(tracking));
>         tracking.spec.dst = (char *)orig_ref;
>         if (for_each_remote(find_tracked_branch, &tracking))
> --
> 1.9.0.1.g5abca64
>
> --
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-- 
Duy

Re: [PATCH] branch.c: delete size check of newly tracked branch names

[Jacopo Notarstefano]

> Nice. new_ref is passed in install_branch_config() in latest code. I
> guess you already made sure this function did not make any assumption
> about new_ref's length?
>

The function install_branch_config uses the strbuf, as I wrote in the
commit message. The contents of this buffer are then fed to
git_config_set, which, after a few more function calls, parses the key
with git_config_parse_key. This function does not rely on any
assumptions (as far as I can tell!) on the name's length, and
allocates enough space for it in
https://github.com/git/git/blob/master/config.c#L1462.

Re: [PATCH] branch.c: delete size check of newly tracked branch names

[Duy Nguyen]

On Fri, Feb 28, 2014 at 7:14 PM, Jacopo Notarstefano
<jacopo.notarstefano@gmail.com> wrote:
>> Nice. new_ref is passed in install_branch_config() in latest code. I
>> guess you already made sure this function did not make any assumption
>> about new_ref's length?
>>
>
> The function install_branch_config uses the strbuf, as I wrote in the
> commit message. The contents of this buffer are then fed to
> git_config_set, which, after a few more function calls, parses the key
> with git_config_parse_key. This function does not rely on any
> assumptions (as far as I can tell!) on the name's length, and
> allocates enough space for it in
> https://github.com/git/git/blob/master/config.c#L1462.

Thanks for checking!
-- 
Duy