I just had a similar problem trying to call a confined app from a
classic one in Python:
subprocess.run("command", stdin=open("/file/path", "rb"))
The way around it is either reading the file into memory and feeding it in:
subprocess.run("command", input=open("/file/path", "rb").read())
Or looping over the file and writing to the process's stdin:
with subprocess.Popen("command", stdin=subprocess.PIPE) as p, \
open("/file/path", "rb") as f:
while True:
buf = f.read(8192)
if buf:
p.stdin.write(buf)
else:
break
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https://bugs.launchpad.net/bugs/1849753
Title:
AppArmor profile prohibits classic snap from inheriting file
descriptors
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