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Clean up daemon handling

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Split `common.sh` into the vars and functions definitions vs starting
the daemon (and possibly other initialization logic). This way,
`init.sh` can just `source` the former. Trying to start the daemon
before `nix.conf` is written will fail because `nix daemon` requires
`--experimental-features 'nix-command'`.

`killDaemon` is idempotent, so it's safe to call when no daemon is
running.

`startDaemon` and `killDaemon` use the PID (which is now exported to
subshells) to decide whether there is work to be done, rather than
`NIX_REMOTE`, which might conceivably be set differently even if a
daemon is running.

`startDaemon` and `killDaemon` can save/restore the old `NIX_REMOTE` as
`NIX_REMOTE_OLD`.

`init.sh` kills daemon before deleting everything (including the daemon
socket).
This commit is contained in:
John Ericson 2021-12-09 15:16:18 +00:00
parent 5dbbf23332
commit 87da941348
6 changed files with 44 additions and 27 deletions
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.gitignore vendored
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@ -75,7 +75,7 @@ perl/Makefile.config
# /tests/
/tests/test-tmp
/tests/common.sh
/tests/common/vars-and-functions.sh
/tests/result*
/tests/restricted-innocent
/tests/shell