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Choose an appropriate python version for x.py at runtime #80585

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Choose an appropriate python version for x.py at runtime #80585

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16 changes: 15 additions & 1 deletion x.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,18 @@
#!/usr/bin/env python
# The beginning of this script is both valid shell and valid python, such that
# the script starts with the shell and is reexecuted with the right python.
# This works because shells only execute a line at a time.
# Thanks to `./mach` from servo for the idea!
''':' && {
exists() { command -v "$1" >/dev/null 2>&1; }
if exists python3; then
exec python3 "$0" "$@"
elif exists python; then
exec python "$0" "$@"
else
exec python2 "$0" "$@"
fi
}
'''

# This file is only a "symlink" to bootstrap.py, all logic should go there.

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