setup_env failed on Debian8/9 with error "GnuTLS: Error in the pull function"

[xinliang]

$ git clone https://github.com/openstack/refstack-client
$ cd refstack-clent
$./setup_env failed at:
Resolving github.com (github.com)... 13.229.188.59, 52.74.223.119, 13.250.177.223
Connecting to github.com (github.com)|13.229.188.59|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://codeload.github.com/pypa/virtualenv/tar.gz/15.0.3 [following]
--2018-05-30 11:48:33-- https://codeload.github.com/pypa/virtualenv/tar.gz/15.0.3
Resolving codeload.github.com (codeload.github.com)... 13.229.189.0, 13.250.162.133, 54.251.140.56
Connecting to codeload.github.com (codeload.github.com)|13.229.189.0|:443... connected.
GnuTLS: Error in the pull function.
Unable to establish SSL connection.
+ tar xvfz 15.0.3.tar.gz
tar (child): 15.0.3.tar.gz: Cannot open: No such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now
+ rm 15.0.3.tar.gz
rm: cannot remove '15.0.3.tar.gz': No such file or directory

verified on debian 8 and debian 9, both have this issue.

[Marcin Juszkiewicz (hrw)]

Works for me:

+ VENV_VERSION=15.0.3
++ timer_start
++ timer=0
+ wget https://github.com/pypa/virtualenv/archive/15.0.3.tar.gz
--2018-05-30 10:00:48-- https://github.com/pypa/virtualenv/archive/15.0.3.tar.gz
Resolving github.com (github.com)... 192.30.253.112, 192.30.253.113
Connecting to github.com (github.com)|192.30.253.112|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://codeload.github.com/pypa/virtualenv/tar.gz/15.0.3 [following]
--2018-05-30 10:00:48-- https://codeload.github.com/pypa/virtualenv/tar.gz/15.0.3
Resolving codeload.github.com (codeload.github.com)... 192.30.253.121, 192.30.253.120
Connecting to codeload.github.com (codeload.github.com)|192.30.253.121|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [application/x-gzip]
Saving to: ‘15.0.3.tar.gz’

15.0.3.tar.gz [ <=> ] 1.76M 3.32MB/s in 0.5s

2018-05-30 10:00:49 (3.32 MB/s) - ‘15.0.3.tar.gz’ saved [1847120]

++ timer_start
++ timer=0
+ tar xvfz 15.0.3.tar.gz
vi...

[xinliang (xin3liang)]

hmm.., I confirmed that this only happened on my own local lab environment:(