File `%f` not found by script

[rspencer01]

Steps to reproduce

1. Set up a script that reads the file specified such as the following

#!/usr/bin/env python3
from PIL import Image
import sys, os

print("Opening image",sys.argv[1])
f = open(sys.argv[1]).read()

2. Add rule along the lines of /path/to/script.py %f >> /tmp/test_output
3. Trigger rule

Expected behaviour

The script should execute without error and a line should be logged to /tmp/test_output

Actual behaviour

The following error is thrown

  File "/path/to/script", line 20, in <module>
    f = open(sys.argv[1]).read()
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/oc_tmp_0f9O8Q-.png'

Vexingly this works if the path to my script is replaced by head -c 10 for example.

Server configuration detail

Operating system: Linux 4.15.0-55-generic #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019 x86_64

Webserver: Apache/2.4.29 (Ubuntu) (apache2handler)

Database: mysql 5.7.27

PHP version:

7.2.19-0ubuntu0.18.04.1
Modules loaded: Core, date, libxml, openssl, pcre, zlib, filter, hash, Reflection, SPL, sodium, session, standard, apache2handler, mysqlnd, PDO, xml, calendar, ctype, curl, dom, mbstring, fileinfo, ftp, gd, gettext, iconv, igbinary, imagick, intl, json, exif, mysqli, pdo_mysql, Phar, posix, readline, redis, shmop, SimpleXML, sockets, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xmlreader, xmlwriter, xsl, zip, Zend OPcache

Nextcloud version: 16.0.3 - 16.0.3.0

Updated from an older Nextcloud/ownCloud or fresh install:

Where did you install Nextcloud from: unknown

Signing status

Array
(
[files_rightclick] => Array
(
[EXTRA_FILE] => Array
(
[README.md] => Array
(
[expected] =>
[current] => cf73849388838de5037624e53303618579b164ec69fd55834ce4c5332ae33f778839e36298cbcc8ede90620927e076dbb8883479754e4c09b0491b15bf7653f3
)

            )

    )

)

List of activated apps

Enabled:
 - accessibility: 1.2.0
 - admin_audit: 1.6.0
 - bookmarks: 1.0.8
 - bruteforcesettings: 1.4.0
 - calendar: 1.7.0
 - cloud_federation_api: 0.2.0
 - comments: 1.6.0
 - contacts: 3.1.3
 - dav: 1.9.2
 - encryption: 2.4.0
 - federatedfilesharing: 1.6.0
 - federation: 1.6.0
 - files: 1.11.0
 - files_pdfviewer: 1.5.0
 - files_rightclick: 0.13.0
 - files_sharing: 1.8.0
 - files_versions: 1.9.0
 - files_videoplayer: 1.5.0
 - firstrunwizard: 2.5.0
 - gallery: 18.3.0
 - issuetemplate: 0.5.0
 - logreader: 2.1.0
 - lookup_server_connector: 1.4.0
 - metadata: 0.9.0
 - nextcloud_announcements: 1.5.0
 - notifications: 2.4.1
 - oauth2: 1.4.2
 - passman: 2.3.2
 - password_policy: 1.6.0
 - privacy: 1.0.0
 - provisioning_api: 1.6.0
 - recommendations: 0.4.0
 - serverinfo: 1.6.0
 - sharebymail: 1.6.0
 - support: 1.0.0
 - survey_client: 1.4.0
 - systemtags: 1.6.0
 - theming: 1.7.0
 - twofactor_backupcodes: 1.5.0
 - updatenotification: 1.6.0
 - user_usage_report: 1.1.2
 - viewer: 1.0.0
 - workflow_script: 1.1.0
 - workflowengine: 1.6.0
Disabled:
 - activity
 - files_external
 - files_texteditor
 - files_trashbin
 - previewgenerator
 - user_ldap

Configuration (config/config.php)

{
    "instanceid": "***REMOVED SENSITIVE VALUE***",
    "passwordsalt": "***REMOVED SENSITIVE VALUE***",
    "secret": "***REMOVED SENSITIVE VALUE***",
    "trusted_domains": [
        ***REMOVED SENSITIVE VALUE***
    ],
    "datadirectory": "***REMOVED SENSITIVE VALUE***",
    "dbtype": "mysql",
    "version": "16.0.3.0",
    "dbname": "***REMOVED SENSITIVE VALUE***",
    "dbhost": "***REMOVED SENSITIVE VALUE***",
    "dbtableprefix": "oc_",
    "dbuser": "***REMOVED SENSITIVE VALUE***",
    "dbpassword": "***REMOVED SENSITIVE VALUE***",
    "logtimezone": "UTC",
    "installed": true,
    "mail_from_address": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpmode": "smtp",
    "mail_domain": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpdebug": true,
    "loglevel": 0,
    "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpport": "587",
    "mail_smtpsecure": "tls",
    "mail_smtpauth": 1,
    "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
    "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
    "maintenance": false,
    "theme": "",
    "memcache.local": "\\OC\\Memcache\\Redis",
    "memcache.locking": "\\OC\\Memcache\\Redis",
    "redis": {
        "host": "***REMOVED SENSITIVE VALUE***",
        "port": 6379
    },
    "mail_sendmailmode": "smtp",
    "overwrite.cli.url": "***REMOVED SENSITIVE VALUE***",
    "htaccess.RewriteBase": "\/",
    "updater.secret": "***REMOVED SENSITIVE VALUE***",
    "app_install_overwrite": [
        "calendar"
    ]
}

Are you using external storage, if yes which one: local/smb/sftp/...

Are you using encryption:

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...

Client configuration

Browser: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:67.0) Gecko/20100101 Firefox/67.0

Operating system: Ubuntu 18.04

[blizzz]

Vexingly this works if the path to my script is replaced by head -c 10 for example.

Right, so the placeholder appears to be replaced fine. The location as in the error output seems correct. Did you double check there is nothing else needed to use the parameter in python?

[rspencer01]

I am quite positive. I think it may have something to do with the /tmp/systemd-private-3b3f0...2-apache2.service-dg...e/tmp folder which has some files that match the format of the filename I am expecting. Is this some kind of sandboxing issue?

[blizzz]

Aye, on systemd-based distros the /tmp of a service is jailed in the specific folder (here: /tmp/systemd-private-3b3f0...2-apache2.service-dg...e/). Trying another location like dev/shm/ (memory!) should work.

[jwetzell]

@rspencer01 did you ever get this resolved I'm having the same issue trying to pass the file into a python script, getting the same No such file or directory: error. If I do something like cat %f > /tmp/test_output and add a file that triggers the flow everything runs just fine.

[rspencer01]

I did not unfortunately, and will not be pursuing this further.

[jwetzell]

@rspencer01 I did get a workaround up by doing something like cp %f /tmp/file.txt and then pointing the python script to the /tmp/file.txt

[blizzz]

Should be fixed with #71, please reopen if not.