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install-python
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Write to temp file and rename it 

This is safer and allows changing the shebang on existing files.

It does require write access to the directory, but typically that's
required for installing a file anyway.
This commit is contained in:
Peter J. Holzer 2023-08-18 12:00:30 +02:00
parent 7de842141d
commit c406d13ce8
1 changed files with 4 additions and 1 deletions
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install-python
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@ -1,6 +1,7 @@
#!/usr/bin/env python3 #!/usr/bin/env python3
import argparse import argparse
import os
import shutil import shutil
import sys import sys
@ -11,7 +12,8 @@ ap.add_argument("destination")
args = ap.parse_args() args = ap.parse_args()
with open(args.source) as inf: with open(args.source) as inf:
with open(args.destination, "w") as outf: tmp_dest = args.destination + "." + str(os.getpid())
with open(tmp_dest, "w") as outf:
first_line = inf.readline() first_line = inf.readline()
if first_line.startswith("#!"): if first_line.startswith("#!"):
print("#!", sys.executable, file=outf) print("#!", sys.executable, file=outf)
@ -20,5 +22,6 @@ with open(args.source) as inf:
outf.write(first_line) outf.write(first_line)
for line in inf: for line in inf:
outf.write(line) outf.write(line)
os.rename(tmp_dest, args.destination)
shutil.copymode(args.source, args.destination) shutil.copymode(args.source, args.destination)