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Re: Commit blocked by pre-commit hook (exit code 255) with no output.

From: foven <effoven_at_gmail.com>
Date: Thu, 3 Dec 2015 17:39:08 -0500

On Thu, Dec 3, 2015 at 4:02 PM, Mark Phippard <markphip_at_gmail.com> wrote:

> Given that you are using Phabricator, have you tried this?
> https://secure.phabricator.com/book/phabricator/article/diffusion_hooks/
> On Thu, Dec 3, 2015 at 3:55 PM, foven <effoven_at_gmail.com> wrote:
>> On Thu, Dec 3, 2015 at 2:54 PM, <jblist_at_icloud.com> wrote:
>>> On Dec 3, 2015, at 9:40 AM, foven <effoven_at_gmail.com> wrote:
>>> On Wed, Dec 2, 2015 at 9:50 PM, Nico Kadel-Garcia <nkadel_at_gmail.com>
>>> wrote:
>>>> On Wed, Dec 2, 2015 at 2:12 PM, foven <effoven_at_gmail.com> wrote:
>>>> > I looked at the output of "journalctl -n 50", which seems to be enough
>>>> > to see all that is logged for a commit attempt. I also checked
>>>> > /var/log/secure. I didn't see anything that seemed obviously wrong to
>>>> > me either way, although it is possible that I missed something. Are
>>>> > there any other logs that I should check?
>>>> >
>>>> > Also, just to be clear, when I say that svn+ssh is not working, it is
>>>> > working for checkouts and if I remove the pre-commit hook, it works
>>>> for
>>>> > commits as well. Does it still seem likely that this is a ssh issue?
>>>> >
>>>> > Is there any more information I can provide that might help?
>>>> Start at the beginning: As whom is the "svn+ssh" connection being
>>>> made? I assume it's the "phd" user, and that the SSH keys have been
>>>> correctly configured?
>>> Well, this repository is hosted by Phabricator.
>>> <…snip…>
>>> I hope this helps. Please let me know if you need more information.
>>> This almost feels to me as if the path "/bin/sh" is not what it seems.
>>> Do you know if Phabricator is using a chroot'd sshd implementation? They
>>> are usually rare since sshd does not provide that by default, but I have
>>> seen some attempts.
>>> -Joseph
>> I'm not totally sure, but I don't think it is. I'm basing this off the
>> fact that the sshd_config file for Phabricator's sshd instance doesn't
>> seem to use ChrootDirectory. I don't know much about using chroot with
>> sshd, but it seems like that is how the chroot directory is specified.
>> So if it isn't present, that would probably imply that chroot is not
>> being used.
>> Of course, I could be wrong. Not sure what else to look for though.
>> Phabricator does set some limitations in the sshd_config file.
>> Here is what the file looks like, in case it is of interest:
>> # NOTE: You must have OpenSSHD 6.2 or newer; support for
>> AuthorizedKeysCommand
>> # was added in this version.
>> # NOTE: Edit these to the correct values for your setup.
>> AuthorizedKeysCommand /usr/libexec/phabricator-ssh-hook.sh
>> AuthorizedKeysCommandUser vcs
>> AllowUsers vcs
>> # You may need to tweak these options, but mostly they just turn off
>> everything
>> # dangerous.
>> Port 22
>> Protocol 2
>> PermitRootLogin no
>> AllowAgentForwarding no
>> AllowTcpForwarding no
>> PrintMotd no
>> PrintLastLog no
>> PasswordAuthentication no
>> AuthorizedKeysFile none
>> PidFile /var/run/sshd-phabricator.pid
> --
> Thanks
> Mark Phippard
> http://markphip.blogspot.com/

I have, but for a different reason.

I don't think it offers a solution for this issue though, since it
doesn't change the fact that there will always be a hooks/pre-commit
script of some sort and currently it seems that any hooks/pre-commit
script will cause the error that I'm experiencing.

Currently, I'm using a very simple hook in place of the one that is
installed by Phabricator by default, but I am only able to do this
because I have disabled the Phabricator daemons. This is just for
testing while I try to resolve this error. When the daemons are
running, they will overwrite the hooks/pre-commit script before running
it, if it is changed (at least that seems to be the case).

I think that the hooks/pre-commit script installed by Phabricator is
responsible for eventually calling the custom hooks discussed in the
guide that you linked. So if that pre-commit script is not present,
they will never be called and if it is present, I get the error. So I
don't think it will help in this case, unless I have missed something.

Also, I just did a quick test:

I moved my test hook to the hooks/pre-commit-phabricator.d/ directory,
as though it were a custom hook I wanted to use, as explained in the
linked guide. This created a situation where there was no
hooks/pre-commit script and the daemons were not running, so none would be
generated. I then tried a commit and was successful, which my hook
would have prevented if it had run. So it seems likely that
Phabricator's hook/pre-commit script is responsible for calling these
hooks. And of course the presence of this hook causes the error to

So, I don't think I can use this to solve my problem. Please let me
know if I missed anything.
Received on 2015-12-03 23:39:39 CET

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