Bug#923166: sagemath-common: sage -version doesn't work

[John Scott]

Package: sagemath-common
Version: 8.6-5
Severity: normal
Control: affects -1 cantor-backend-sage

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sage -v tries to source sage-version.sh, but neither
$SAGE_SCRIPTS_DIR nor $SAGE_ROOT are set, so
  $ sage -v
  /usr/bin/sage: line 16: /src/bin/sage-version.sh: No such file or directory
from trying to open $SAGE_ROOT/src/bin/sage-version.sh.
I found that this affects Cantor's backend [1] with
help there.

Here's a hideous workaround that works for me.
  # mkdir -p /src/bin/
  # ln -s /usr/share/sagemath/bin/sage-version.sh /src/bin/sage-version.sh
  $ sage -v
  SageMath version 8.6, Release Date: 2019-01-15

[1] https://bugs.kde.org/show_bug.cgi?id=404752

- -- System Information:
Debian Release: buster/sid
  APT prefers testing-debug
  APT policy: (500, 'testing-debug'), (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-2-amd64 (SMP w/2 CPU cores)
Kernel taint flags: TAINT_FIRMWARE_WORKAROUND
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages sagemath-common depends on:
ii  python  2.7.15-4

sagemath-common recommends no packages.

sagemath-common suggests no packages.

- -- no debconf information

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