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Allow piping into kamal exec #1485 #1544

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prullmann
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This PR enables data to be piped to remote commands via STDIN.

An example use case would be to restore a database backup from your local dev machine:
kamal accessory exec -i --reuse mysql 'mysql example_db"' < example_db_backup.sql

As discussed in #1485, the implementation for interactive mode now checks if STDIN is connected to a TTY and only then it uses the current '-it' options for docker, else it uses '-i', which enables the transfer of data via STDIN.

The implementation should be straight forward, just the tests were a bit tricky.
I made sure the tests also still work when not run from a tty (eg within CI).
I hope it's OK like this, any comments are welcome.

prullmann added 2 commits May 8, 2025 12:41
also adding helpers to simulate STDIN being tty or file
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Hi @djmb, Do you have any comments? Is there anything I can do to make this easier for you to review?

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fdev commented Jun 13, 2025

This is a very welcome change. It enables me to perform all common management tasks through kamal aliases, instead of just a subset. Hopefully it gets merged soon.

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