Failures in sage0 pexpect interface with specific length of $DOT_SAGE using a "screen" terminal

[Jeroen Demeyer]

In similar spirit as #12221, the following is a reproducible failure on sage.math when the $HOME directory is set to /mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/home using a "screen" terminal (with 138 columns if this matters):

sage -t  -force_lib devel/sage/sage/interfaces/sage0.py
**********************************************************************
File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/devel/sage-main/sage/interfaces/sage0.py", line 448:
    sage: F == sage0(F)._sage_()
Exception raised:
    Traceback (most recent call last):
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/ncadoctest.py", line 1231, in run_one_test
        self.run_one_example(test, example, filename, compileflags)
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/sagedoctest.py", line 38, in run_one_example
        OrigDocTestRunner.run_one_example(self, test, example, filename, compileflags)
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/ncadoctest.py", line 1172, in run_one_example
        compileflags, 1) in test.globs
      File "<doctest __main__.example_20[4]>", line 1, in <module>
        F == sage0(F)._sage_()###line 448:
    sage: F == sage0(F)._sage_()
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/lib/python/site-packages/sage/interfaces/sage0.py", line 458, in _sage_
        return load(P._local_tmpfile())
      File "sage_object.pyx", line 775, in sage.structure.sage_object.load (sage/structure/sage_object.c:7937)
    IOError: [Errno 2] No such file or directory: '/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/home/.sage//temp/sage.math.washington.edu/29758//interface//tmp29886.sobj'
**********************************************************************
File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/devel/sage-main/sage/interfaces/sage0.py", line 466:
    sage: four_gcd(6)
Expected:
    2
Got:
    <BLANKLINE>
**********************************************************************
File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/devel/sage-main/sage/interfaces/sage0.py", line 489:
    sage: sage0(4).gcd
Expected:
    <built-in method gcd of sage.rings.integer.Integer object at 0x...>
Got:
    <BLANKLINE>
**********************************************************************
File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/devel/sage-main/sage/interfaces/sage0.py", line 515:
    sage: half = reduce_load_element(s); half
Expected:
    1/2
Got:
    <BLANKLINE>
**********************************************************************
File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/devel/sage-main/sage/interfaces/sage0.py", line 547:
    sage: sage0_version() == version()
Expected:
    True
Got:
    False
**********************************************************************
File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/devel/sage-main/sage/interfaces/sage0.py", line 174:
    sage: print "ignore this";  sage0.cputime()     # random output
Exception raised:
    Traceback (most recent call last):
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/ncadoctest.py", line 1231, in run_one_test
        self.run_one_example(test, example, filename, compileflags)
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/sagedoctest.py", line 38, in run_one_example
        OrigDocTestRunner.run_one_example(self, test, example, filename, compileflags)
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/ncadoctest.py", line 1172, in run_one_example
        compileflags, 1) in test.globs
      File "<doctest __main__.example_3[2]>", line 1, in <module>
        print "ignore this";  sage0.cputime()     # random output###line 174:
    sage: print "ignore this";  sage0.cputime()     # random output
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/lib/python/site-packages/sage/interfaces/sage0.py", line 185, in cputime
        return float(s)
    ValueError: could not convert string to float:
**********************************************************************
File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/devel/sage-main/sage/interfaces/sage0.py", line 176:
    sage: sage0('factor(2^157-1)')
Expected:
    852133201 * 60726444167 * 1654058017289 * 2134387368610417
Got:
    <BLANKLINE>
**********************************************************************
File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/devel/sage-main/sage/interfaces/sage0.py", line 178:
    sage: print "ignore this";  sage0.cputime()     # random output
Exception raised:
    Traceback (most recent call last):
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/ncadoctest.py", line 1231, in run_one_test
        self.run_one_example(test, example, filename, compileflags)
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/sagedoctest.py", line 38, in run_one_example
        OrigDocTestRunner.run_one_example(self, test, example, filename, compileflags)
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/ncadoctest.py", line 1172, in run_one_example
        compileflags, 1) in test.globs
      File "<doctest __main__.example_3[4]>", line 1, in <module>
        print "ignore this";  sage0.cputime()     # random output###line 178:
    sage: print "ignore this";  sage0.cputime()     # random output
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/lib/python/site-packages/sage/interfaces/sage0.py", line 185, in cputime
        return float(s)
    ValueError: invalid literal for float(): 852133201 * 60726444167 * 1654058017289 * 2134387368610417
**********************************************************************
File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/devel/sage-main/sage/interfaces/sage0.py", line 191:
    sage: t = sage0.trait_names()
Exception raised:
    Traceback (most recent call last):
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/ncadoctest.py", line 1231, in run_one_test
        self.run_one_example(test, example, filename, compileflags)
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/sagedoctest.py", line 38, in run_one_example
        OrigDocTestRunner.run_one_example(self, test, example, filename, compileflags)
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/ncadoctest.py", line 1172, in run_one_example
        compileflags, 1) in test.globs
      File "<doctest __main__.example_4[2]>", line 1, in <module>
        t = sage0.trait_names()###line 191:
    sage: t = sage0.trait_names()
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/lib/python/site-packages/sage/interfaces/sage0.py", line 197, in trait_names
        return eval(self.eval('print repr(globals().keys())'))
      File "<string>", line 0

       ^
    SyntaxError: unexpected EOF while parsing
**********************************************************************
File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/devel/sage-main/sage/interfaces/sage0.py", line 192:
    sage: len(t) > 100
Exception raised:
    Traceback (most recent call last):
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/ncadoctest.py", line 1231, in run_one_test
        self.run_one_example(test, example, filename, compileflags)
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/sagedoctest.py", line 38, in run_one_example
        OrigDocTestRunner.run_one_example(self, test, example, filename, compileflags)
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/ncadoctest.py", line 1172, in run_one_example
        compileflags, 1) in test.globs
      File "<doctest __main__.example_4[3]>", line 1, in <module>
        len(t) > Integer(100)###line 192:
    sage: len(t) > 100
    NameError: name 't' is not defined
**********************************************************************
File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/devel/sage-main/sage/interfaces/sage0.py", line 194:
    sage: 'gcd' in t
Exception raised:
    Traceback (most recent call last):
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/ncadoctest.py", line 1231, in run_one_test
        self.run_one_example(test, example, filename, compileflags)
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/sagedoctest.py", line 38, in run_one_example
        OrigDocTestRunner.run_one_example(self, test, example, filename, compileflags)
      File "/mnt/usb1/scratch/jdemeyer/merger/sage-5.0.beta1/local/bin/ncadoctest.py", line 1172, in run_one_example
        compileflags, 1) in test.globs
      File "<doctest __main__.example_4[4]>", line 1, in <module>
        'gcd' in t###line 194:
    sage: 'gcd' in t
    NameError: name 't' is not defined
**********************************************************************

This reproducible error is fixed by #12221.

The above error also sometimes happens in different circumstances in a non-reproducible way. It is regularly seen on the buildbot for example.

[Jeroen Demeyer]

This might very well be a duplicate of #12221.

[Jeroen Demeyer]

Closing this as duplicate of #12221.