Subject: Re: quick bare clones taking longer?

From: Andy Whitcroft <[email-masked]>
Date: Thu, 10 May 2007 18:04:55 +0100

Junio C Hamano wrote:
> Junio C Hamano <[email-masked]> writes:
> 
>> David Miller <[email-masked]> writes:
>>
>>> From: Junio C Hamano <[email-masked]>
>>> Date: Wed, 09 May 2007 15:59:23 -0700
>>>
>>>> The above sequence is called before we create the new directory
>>>> and chdir to it.  Maybe pwd has funny behaviour (e.g. $PWD) and
>>>> we need to explicitly say /bin/pwd or somesuch...
>>> Indeed:
>>>
>>> [davem@hera ~]$ pwd
>>> /home/davem
>>> [davem@hera ~]$ cd git
>>> [davem@hera git]$ pwd
>>> /home/davem/git
>>> [davem@hera git]$ /bin/pwd
>>> /home/ftp/pub/scm/linux/kernel/git/davem
>>> [davem@hera git]$ 
>> Thanks.
> 
> This would fix it, but I find this kind of ugly.
> 
> -- >8 --
> git-clone: don't get fooled by $PWD
> 
> If you have /home/me/git symlink pointing at /pub/git/mine,
> trying to clone from /pub/git/his/ using relative path would not
> work as expected:
> 
> 	$ cd /home/me
>         $ cd git
>         $ ls ../
>         his    mine
>         $ git clone -l -s -n ../his/stuff.git
> 
> This is because "cd ../his/stuff.git" done inside git-clone to
> check if the repository is local is confused by $PWD, which is
> set to /home/me, and tries to go to /home/his/stuff.git which is
> different from /pub/git/his/stuff.git.
> 
> We could probably say "set -P" (or "cd -P") instead, if we know
> the shell is POSIX, but the way the patch is coded is probably
> more portable.
> 
> Signed-off-by: Junio C Hamano <[email-masked]>
> ---
> 
> diff --git a/git-clone.sh b/git-clone.sh
> index cad5c0c..c5852a2 100755
> --- a/git-clone.sh
> +++ b/git-clone.sh
> @@ -18,7 +18,14 @@ usage() {
>  }
>  
>  get_repo_base() {
> -	(cd "$1" && (cd .git ; pwd)) 2> /dev/null
> +	(
> +		cd "`/bin/pwd`" &&
> +		cd "$1" &&
> +		(
> +			cd .git
> +			pwd
> +		)
> +	) 2>/dev/null
>  }
>  
>  if [ -n "$GIT_SSL_NO_VERIFY" ]; then

That is pretty much how I have seen this solved in the past.  One thing
while you are playing with this code.  There seems to be an extra
sub-shell in there unnecesarily and the error redirection seems a little
aggressive?

This seems to be semantically equivalent:

get_repo_base() {
	(
		cd "`/bin/pwd`" &&
		cd "$1" &&
		{
			cd .git 2>/dev/null
			pwd
		}
	)
}

-apw