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error: cannot run hooks/pre-receive: No such file or directory

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error: cannot run hooks/pre-receive: No such file or directory

Mathieu Malaterre
Hi all,

  I am trying to use a ruby script to reject commit with non-linear
history (*). However it keeps failing with the following message:

$ git push
Counting objects: 5, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 304 bytes, done.
Total 3 (delta 2), reused 0 (delta 0)
error: cannot run hooks/pre-receive: No such file or directory
To ssh://[hidden email]/gitroot/gdcm/gdcm.old
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to
'ssh://[hidden email]/gitroot/gdcm/gdcm.old'

I tried with something as simple as :

% cat pre-receive
#!/usr/bin/ruby
% which ruby
/usr/bin/ruby

Do I need to do something special with ruby ?

Thanks,
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Mathieu
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Re: error: cannot run hooks/pre-receive: No such file or directory

Dan Johnson
On Wed, Mar 30, 2011 at 9:27 AM, Mathieu Malaterre
<[hidden email]> wrote:

> Hi all,
>
>  I am trying to use a ruby script to reject commit with non-linear
> history (*). However it keeps failing with the following message:
>
> $ git push
> Counting objects: 5, done.
> Delta compression using up to 4 threads.
> Compressing objects: 100% (3/3), done.
> Writing objects: 100% (3/3), 304 bytes, done.
> Total 3 (delta 2), reused 0 (delta 0)
> error: cannot run hooks/pre-receive: No such file or directory
> To ssh://[hidden email]/gitroot/gdcm/gdcm.old
>  ! [remote rejected] master -> master (pre-receive hook declined)
> error: failed to push some refs to
> 'ssh://[hidden email]/gitroot/gdcm/gdcm.old'
>
> I tried with something as simple as :
>
> % cat pre-receive
> #!/usr/bin/ruby
> % which ruby
> /usr/bin/ruby
Check that hooks/pre-receive is executable? (chmod +x)
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Re: error: cannot run hooks/pre-receive: No such file or directory

Jeff King
In reply to this post by Mathieu Malaterre
On Wed, Mar 30, 2011 at 03:27:14PM +0200, Mathieu Malaterre wrote:

> $ git push
> Counting objects: 5, done.
> Delta compression using up to 4 threads.
> Compressing objects: 100% (3/3), done.
> Writing objects: 100% (3/3), 304 bytes, done.
> Total 3 (delta 2), reused 0 (delta 0)
> error: cannot run hooks/pre-receive: No such file or directory
> To ssh://[hidden email]/gitroot/gdcm/gdcm.old
>  ! [remote rejected] master -> master (pre-receive hook declined)
> error: failed to push some refs to
> 'ssh://[hidden email]/gitroot/gdcm/gdcm.old'

We won't try to execute a hook that doesn't exist, so the "no such file
or directory" almost certainly means the #! interpreter is missing.

> I tried with something as simple as :
>
> % cat pre-receive
> #!/usr/bin/ruby
> % which ruby
> /usr/bin/ruby

This might be a stupid question, but which machine is that output from?
The pre-receive hook runs on the server, so you must have ruby there. I
ask mainly because I didn't realize sourceforge would give people
arbitrary shell access on the git boxes.

My next guess would be that the git process runs in some kind of chroot
that doesn't have ruby in it.

> Do I need to do something special with ruby ?

From git's perspective, no, but it may depend on how the server is
configured.

-Peff
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Re: error: cannot run hooks/pre-receive: No such file or directory

Mathieu Malaterre
On Wed, Mar 30, 2011 at 10:04 PM, Jeff King <[hidden email]> wrote:

> On Wed, Mar 30, 2011 at 03:27:14PM +0200, Mathieu Malaterre wrote:
>
>> $ git push
>> Counting objects: 5, done.
>> Delta compression using up to 4 threads.
>> Compressing objects: 100% (3/3), done.
>> Writing objects: 100% (3/3), 304 bytes, done.
>> Total 3 (delta 2), reused 0 (delta 0)
>> error: cannot run hooks/pre-receive: No such file or directory
>> To ssh://[hidden email]/gitroot/gdcm/gdcm.old
>>  ! [remote rejected] master -> master (pre-receive hook declined)
>> error: failed to push some refs to
>> 'ssh://[hidden email]/gitroot/gdcm/gdcm.old'
>
> We won't try to execute a hook that doesn't exist, so the "no such file
> or directory" almost certainly means the #! interpreter is missing.
>
>> I tried with something as simple as :
>>
>> % cat pre-receive
>> #!/usr/bin/ruby
>> % which ruby
>> /usr/bin/ruby
>
> This might be a stupid question, but which machine is that output from?
> The pre-receive hook runs on the server, so you must have ruby there. I
> ask mainly because I didn't realize sourceforge would give people
> arbitrary shell access on the git boxes.
>
> My next guess would be that the git process runs in some kind of chroot
> that doesn't have ruby in it.

Makes complete sense now. I thought initially that the "no such file"
refered to the actual hooks script. I naively assumed my ssh
connection on sf.net gave me access to the actual git boxes (or maybe
it is executed from a chroot).

In any case rewriting the script in pure shell script (no bash either)
seems to work ok now (*).

However I am now being told that this script should rather go in the
update hooks...


(*)
read rev_old rev_new refname

ref_to_check="refs/heads/master"

if [ "$refname" == "$ref_to_check" ]
then
  merge_bases=`git merge-base ${rev_old} ${rev_new}`
  if [ "$merge_bases" != "$rev_old" ]
  then
    echo "Non fastward is disallowed"
    exit 1
  fi
  # non-fast-forward case:
  git rev-list --parents $merge_bases..$rev_new \
    | while read x; do
      set -- $x
      if [ "$#" != "2" ]
      then
        echo "Multiple parents: $x";
        exit 1
      fi;
    done
  [ $? -ne 0 ] && exit 1
fi
exit 0
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