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try to find shell via os.environ if detect_shell fail (#2115) #2147

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merged 3 commits into from
Apr 6, 2020
Merged

try to find shell via os.environ if detect_shell fail (#2115) #2147

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e29b3a5
new (utils.shell): try to find shell via os.environ if detect_shell fail
Mar 8, 2020
8c3a071
fix (utils.shell): pass error message when finding shell via environm…
Mar 9, 2020
0b2af04
change (util.shell): check if env variables are available
finswimmer Apr 4, 2020
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12 changes: 11 additions & 1 deletion poetry/utils/shell.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
from shellingham import detect_shell

from ._compat import WINDOWS
from ._compat import Path
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from .env import VirtualEnv


Expand Down Expand Up @@ -41,7 +42,16 @@ def get(cls): # type: () -> Shell

try:
name, path = detect_shell(os.getpid())
except (RuntimeError, ShellDetectionFailure):
except ShellDetectionFailure:
if os.name == "posix":
shell = os.environ["SHELL"]
elif os.name == "nt":
shell = os.environ["COMSPEC"]
else:
raise RuntimeError("Unable to detect the current shell.")

name, path = Path(shell).stem, shell
except RuntimeError:
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Suggested change
except ShellDetectionFailure:
if os.name == "posix":
shell = os.environ["SHELL"]
elif os.name == "nt":
shell = os.environ["COMSPEC"]
else:
raise RuntimeError("Unable to detect the current shell.")
name, path = Path(shell).stem, shell
except RuntimeError:
except (RuntimeError, ShellDetectionFailure):
if os.name == "posix":
shell = os.environ["SHELL"]
elif os.name == "nt":
shell = os.environ["COMSPEC"]

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If you want to really guard against failure, then we should probably check the env var exists before accessing it :)

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According to https://github.com/sarugaku/shellingham#notes-for-application-developers the env vars should always exists. But yes, testing it doesn't hurt.

raise RuntimeError("Unable to detect the current shell.")

cls._shell = cls(name, path)
Expand Down