Bug in installing

[jpisongithub]

When trying to install on OctoPi Version 1.3.6 running on raspi0 I get the following...

Installing plugin "OctoPrint-Webhooks" from https://github.com/2blane/OctoPrint-Webhooks/archive/master.zip.../home/pi/oprint/bin/python2 -m pip install https://github.com/2blane/OctoPrint-Webhooks/archive/master.zipCollecting https://github.com/2blane/OctoPrint-Webhooks/archive/master.zipDownloading https://github.com/2blane/OctoPrint-Webhooks/archive/master.zipRequirement already satisfied: OctoPrint in /home/pi/oprint/lib/python2.7/site-packages (from OctoPrint-Webhooks==3.0.3)Requirement already satisfied: requests in /home/pi/oprint/lib/python2.7/site-packages (from OctoPrint-Webhooks==3.0.3)Collecting pillow (from OctoPrint-Webhooks==3.0.3)Downloading https://files.pythonhosted.org/packages/b3/d0/a20d8440b71adfbf133452d4f6e0fe80de2df7c2578c9b498fb812083383/Pillow-6.2.2.tar.gz (37.8MB)Exception:Traceback (most recent call last):File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/basecommand.py", line 215, in mainstatus = self.run(options, args)File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/commands/install.py", line 335, in runwb.build(autobuilding=True)File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/wheel.py", line 749, in buildself.requirement_set.prepare_files(self.finder)File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/req/req_set.py", line 380, in prepare_filesignore_dependencies=self.ignore_dependencies))File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/req/req_set.py", line 620, in _prepare_filesession=self.session, hashes=hashes)File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/download.py", line 821, in unpack_urlhashes=hashesFile "/home/pi/oprint/local/lib/python2.7/site-packages/pip/download.py", line 659, in unpack_http_urlhashes)File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/download.py", line 882, in _download_http_url_download_url(resp, link, content_file, hashes)File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/download.py", line 603, in _download_urlhashes.check_against_chunks(downloaded_chunks)File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/utils/hashes.py", line 46, in check_against_chunksfor chunk in chunks:File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/download.py", line 571, in written_chunksfor chunk in chunks:File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/utils/ui.py", line 139, in iterfor x in it:File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/download.py", line 560, in resp_readdecode_content=False):File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/_vendor/urllib3/response.py", line 436, in streamdata = self.read(amt=amt, decode_content=decode_content)File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/_vendor/urllib3/response.py", line 384, in readdata = self._fp.read(amt)File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/_vendor/cachecontrol/filewrapper.py", line 63, in readself._close()File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/_vendor/cachecontrol/filewrapper.py", line 50, in _closeself.__callback(self.__buf.getvalue())File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/_vendor/cachecontrol/controller.py", line 275, in cache_responseself.serializer.dumps(request, response, body=body),File "/home/pi/oprint/local/lib/python2.7/site-packages/pip/_vendor/cachecontrol/serialize.py", line 86, in dumpsdata, separators=(",", ":"), sort_keys=True,File "/usr/lib/python2.7/json/init.py", line 251, in dumpssort_keys=sort_keys, **kw).encode(obj)File "/usr/lib/python2.7/json/encoder.py", line 210, in encodereturn ''.join(chunks)MemoryError

[2blane]

Hmm, if you look at the very last word there is a 'MemoryError'. Seems your Raspberry Pi 0 ran out of memory trying to install 'Pillow' which is a package needed by the plugin. Seems to be an issue on smaller devices. Will look into if there is a workaround

[2blane]

@jpisongithub
Looks like it's a common issue. See these links for more guidance. It looks a little involved to fix, but basically, the Pi 0 doesn't have a ton of memory so it only allows a certain amount to things like temporary downloads (which is used by PIP to install the plugin and its dependencies). My plugin isn't the only one you'll run into issues with.

General Octoprint Issue

Installing another plugin with issues

[jpisongithub]

Interesting, just found this... python-pillow/Pillow#4555 will try ssh into the pi then running "sudo pip install --no-cache-dir Pillow" and report back

[jpisongithub]

pip install command via SSH doesn't work due to another documented blunder

workaround follows using the octopi web interface...

went into settings and then to plugin manager
click the wrench in the upper right hand corner
scroll all the way down to the bottom

for additional arguments enter: --no-cache-dir
and check: Force the user of the --user flag with pop install

then install webhooks

then reboot the pi when prompted

works 👍 thanks for pointing me in the right direction!

[2blane]

@jpisongithub great to hear! Glad you got it working!