[ISSUE] python3-httplib2 does not have working TLS support because it installs a symlink to /etc/ssl/cert.pem

[ISSUE] python3-httplib2 does not have working TLS support because it installs a symlink to /etc/ssl/cert.pem

[oldlaptop]

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New issue by oldlaptop on void-packages repository

https://github.com/void-linux/void-packages/issues/38065

Description:
### Is this a new report?

Yes

### System Info

Void 5.15.45_1 x86_64 GenuineIntel uptodate rFFF

### Package(s) Affected

python3-httplib2-0.18.1_3, python3-raven-6.10.0_5

### Does a report exist for this bug with the project's home (upstream) and/or another distro?

N/A

### Expected behaviour

Apparently, no package provides /etc/ssl/cert.pem (as opposed to /etc/ssl/certs.pem) anymore, so presumably nothing should be installing symlinks to it.

### Actual behaviour

python3-httplib2 no longer works with TLS because it can't find the certificates:

```
$ python3 
Python 3.10.5 (main, Jun  8 2022, 02:00:39) [GCC 10.2.1 20201203] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from httplib2 import Http
>>> h = Http()
>>> h.request('https://example.com')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.10/site-packages/httplib2/__init__.py", line 1820, in request
    conn = self.connections[conn_key] = connection_type(
  File "/usr/lib/python3.10/site-packages/httplib2/__init__.py", line 1270, in __init__
    context = _build_ssl_context(
  File "/usr/lib/python3.10/site-packages/httplib2/__init__.py", line 214, in _build_ssl_context
    context.load_verify_locations(ca_certs)
FileNotFoundError: [Errno 2] No such file or directory
>>>
```

This appears to be because it's using this symlink as its cert file:
```
$ ls -l /usr/lib/python3.10/site-packages/httplib2/cacerts.txt        
lrwxrwxrwx 1 root root 17 Oct  9  2021 /usr/lib/python3.10/site-packages/httplib2/cacerts.txt -> /etc/ssl/cert.pem
```

Creating a (hard|soft) link from cert.pem to certs.pem solves the problem. 

Furthermore, it appears one other package installs such a symlink:
```
$ xlocate /etc/ssl/cert.pem 
python3-httplib2-0.18.1_3       /usr/lib/python3.10/site-packages/httplib2/cacerts.txt -> /etc/ssl/cert.pem
python3-raven-6.10.0_5  /usr/lib/python3.10/site-packages/raven/data/cacert.pem -> /etc/ssl/cert.pem
```

### Steps to reproduce

Install python3-httplib2 and copy the above interactive python session; alternatively, install python3-httplib2 and observe that it installs a symlink to /etc/ssl/cert.pem.

Re: [ISSUE] [CLOSED] python3-httplib2 does not have working TLS support because it installs a symlink to /etc/ssl/cert.pem

[sgn]

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Closed issue by oldlaptop on void-packages repository

https://github.com/void-linux/void-packages/issues/38065

Description:
### Is this a new report?

Yes

### System Info

Void 5.15.45_1 x86_64 GenuineIntel uptodate rFFF

### Package(s) Affected

python3-httplib2-0.18.1_3, python3-raven-6.10.0_5

### Does a report exist for this bug with the project's home (upstream) and/or another distro?

N/A

### Expected behaviour

Apparently, no package provides /etc/ssl/cert.pem (as opposed to /etc/ssl/certs.pem) anymore, so presumably nothing should be installing symlinks to it.

### Actual behaviour

python3-httplib2 no longer works with TLS because it can't find the certificates:

```
$ python3 
Python 3.10.5 (main, Jun  8 2022, 02:00:39) [GCC 10.2.1 20201203] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from httplib2 import Http
>>> h = Http()
>>> h.request('https://example.com')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.10/site-packages/httplib2/__init__.py", line 1820, in request
    conn = self.connections[conn_key] = connection_type(
  File "/usr/lib/python3.10/site-packages/httplib2/__init__.py", line 1270, in __init__
    context = _build_ssl_context(
  File "/usr/lib/python3.10/site-packages/httplib2/__init__.py", line 214, in _build_ssl_context
    context.load_verify_locations(ca_certs)
FileNotFoundError: [Errno 2] No such file or directory
>>>
```

This appears to be because it's using this symlink as its cert file:
```
$ ls -l /usr/lib/python3.10/site-packages/httplib2/cacerts.txt        
lrwxrwxrwx 1 root root 17 Oct  9  2021 /usr/lib/python3.10/site-packages/httplib2/cacerts.txt -> /etc/ssl/cert.pem
```

Creating a (hard|soft) link from cert.pem to certs.pem solves the problem. 

Furthermore, it appears one other package installs such a symlink:
```
$ xlocate /etc/ssl/cert.pem 
python3-httplib2-0.18.1_3       /usr/lib/python3.10/site-packages/httplib2/cacerts.txt -> /etc/ssl/cert.pem
python3-raven-6.10.0_5  /usr/lib/python3.10/site-packages/raven/data/cacert.pem -> /etc/ssl/cert.pem
```

### Steps to reproduce

Install python3-httplib2 and copy the above interactive python session; alternatively, install python3-httplib2 and observe that it installs a symlink to /etc/ssl/cert.pem.