the fab hang issue

[tbxy09]

using the step debugger pudb to run the fabfile.py, instead of run the cli fab

python -m pudb fabfile.py

when running the this line

from fabric.api import cd, lcd, env, local,serial

it hang about more than 60 seconds sometime

turns out, this line will import tons of modules including pynacl,then refer this issue to pynacl #327

this has a more detail description libsodium-php94

[tbxy09]

I am now wondering using the fab to manage my cloud service,but turns out this is very deep issue
the uname output

     Linux lev 4.15.0-36-generic #39~16.04.1-Ubuntu SMP Tue Sep 25 08:59:23 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

[tbxy09]

https://libsodium.gitbook.io/doc/usage

    #if defined(__linux__)
    # include <fcntl.h>
    # include <unistd.h>
    # include <sys/ioctl.h>
    # include <linux/random.h>
    #endif
    // ...
    #if defined(__linux__) && defined(RNDGETENTCNT)
    int fd;
    int c;
    ​
    if ((fd = open("/dev/random", O_RDONLY)) != -1) {
        if (ioctl(fd, RNDGETENTCNT, &c) == 0 && c < 160) {
            fputs("This system doesn't provide enough entropy to quickly generate high-quality random numbers.\n"
                  "Installing the rng-utils/rng-tools, jitterentropy or haveged packages may help.\n"
                  "On virtualized Linux environments, also consider using virtio-rng.\n"
                  "The service will not start until enough entropy has been collected.\n", stderr);
        }
        (void) close(fd);
    }
    #endif