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Allow process users to set 'raw_stdout', which if set skips redirecting
and saving output from processes.
Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
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If an asynchronous job is running over a reinit, the process can return
and run its callback function after the reinit. This becomes a problem
if the callback function accesses pointers that were only valid before
the reinit (eg. device structs).
If a reinit is requested explicitly stop all active asynchronous jobs
and clear their callback functions before the reinit.
Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
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Allow a custom callback function to be set when registering the IO
waiter for asynchronous processes.
To allow output from processes to be parsed as it is received, add
process_stdout_custom() which passes a new "line" parameter to
process_read_stdout_once() in order to consume output as it appears.
Users of a custom IO callback will only have access to the process_info
struct which is internal to lib/process; the function
procinfo_get_process() is added to allow these callers to access process
information.
Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
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We have a few incorrect checks for the exit status of a process; this
change adds a helper with the correct WIFEXITED && WEXITSTATUS==0 logic.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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For some process execution functions, we'd like to capture stderr as
well as stdout. Currently, we unconditionally redirect subprocess stderr
to the petitboot log file.
This change adds an add_stderr flag to struct process, which indicates
to the process library that we want stderr as well as stdout. If this is
specified, the subprocess' stderr is captured to stdout_buf.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Implement dry-run behaviour on the discover server by passing a bool to
process_init. UIs don't need to support dry runs.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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We've grown-out of pb_run_cmd a little, as we have a number of different
process types:
boot():
- kexec: short-running process, run synchronously
- boot hooks: short-running, run sync, need exit code & stdout
network init:
- interface configuration: short running, run sync
- udhcp processes are long running, we may want completion, but
doesn't block other actions
downloads:
- potentially long-running, block parse progress
config nvram:
- read: short running, can block, need stdout
- write: short running, can block
We'd like to introduce proper asynchronous processes, to allow config &
boot-option downloads without blocking the discover server.
This change introduces a new type for processes, 'struct process'. These
structures are created with process_create, and run with
process_run_sync or process_run_async. The latter reports completion
through a callback member of struct process.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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