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Before this change, it was difficult to discern which job emitted which
output, as there was no information connecting the job to the output it
produced. This change rectifies that by annotating each line output by
cron/mcron with a prefix that contains a timestamp and the job name. It also
reports about when the job runs and whether it completed successfully or
failed. It was initially suggested here: <https://issues.guix.gnu.org/36510>.
Thanks to the fine people from the #guile libera.chat IRC channel for
providing ideas and help; this change would not have been possible without
them!
* src/mcron/base.scm (install-suspendable-ports!): Install suspendable ports.
(%date-format, %log-format): New parameters.
(validate-date-format, validate-log-format): New procedures.
(<job-data>): New record.
(run-job): Update doc. Redirect stdout and stderr to a pipe. Return a
<job-data> instance containing the input port and other information about the
job. Output job status messages.
(process-output): New procedure.
(child-cleanup): Add docstring. Use positive logic. Call 'process-output'
one last time after a child process is collected.
(run-job-loop): Add a CHILDREN-DATA variable to the loop. Provide the open
file descriptors of the children ports to select*, and collect their output
when they trigger select.
* tests/base.scm ("run-job: basic"): Adjust and fix indentation.
(dummy-job/capture-output): New procedure.
("run-job, output"): New test.
("validate-date-format, valid", "validate-date-format, invalid")
("validate-log-format, valid", "validate-log-format, invalid")
("run-job, output with custom format", "run-job, failure")
("run-job, failure in shell action"): New tests.
* src/mcron/scripts/cron.scm (show-help): Document new options.
(%options) [log-format, date-format]: New options.
(main): Parameterize the main loop with the new parameter options (or their
default values when not provided); move exception handling elsewhere (see
below).
* src/mcron/scripts/mcron.scm: Likewise.
* src/cron.in: Install error handler here.
* src/mcron.in: Likewise.
* doc/mcron.texi: Document new cron and mcron options, as well as new
(mcron base) APIs.
* tests/basic.sh: Test the new options.
Suggested-by: Robert Vollmert <rob@vllmrt.net>
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Paul has been in touch to say that the crontab format was not his invention,
and that his program was based off of V7's cron's functionality, not later
AT&T and Berkeley ones.
Thus the mcron manual is edited extensively to emphasise more the POSIX
standard crontab format, and to point out a more accurate history of cron
developments.
* doc/mcron.texi: small changes throughout the document.
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The second example under the manual heading Simple Examples does not work.
The call to next-minute-from errs because the second argument must be a
list. It can’t be the raw number 15.
Thanks to Colton Lewis.
* doc/mcron.texi: edited text.
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Replace his/hers with theirs, etc.
*doc/mcron.text: light edits only.
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* doc/mcron.texi (Every second Sunday): If the first day of the month is
Sunday, then the second Sunday of the month is seven days later not
eight.
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Reifying the notion of a schedule helps reasoning about the code.
Passing a schedule as an argument to related procedures allows writing
simpler unit tests.
* src/mcron/base.scm(<schedule>): New record data type.
(make-schedule, schedule-user, set-schedule-user!)
(schedule-system, set-schedule-system!)
(schedule-current, set-schedule-current!): New procedures.
(system-job-list, user-job-list, configuration-source): Replace those
global variables with ...
(%global-schedule): ... this global <schedule> instance.
* src/mcron/base.scm (use-system-job-list, use-user-job-list)
(remove-user-jobs, clear-system-jobs, add-job, find-next-jobs)
(display-schedule, run-job-loop): Add '#:SCHEDULE' keyword argument.
* doc/mcron.texi (The base module): Update documentation.
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This procedure is a more generic and less coupled version of
'get-schedule' which has been kept for backward compatibility and
deprecated.
* src/mcron/base.scm (display-schedule): New procedure.
(get-schedule): Move to ...
* src/mcron/core.scm: ... here.
* src/mcron/scripts/cron.scm (main): Use 'display-schedule'.
* src/mcron/scripts/mcron.scm (main): Likewise.
* doc/mcron.texi (The base module): Document it.
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* doc/mcron.texi (Invoking cron or crond): Use 'unless' form and put
"/etc/crontab" inside a @code command.
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* src/mcron/job-specifier.scm (job): Add #:user keyword argument.
* doc/mcron.texi (Job specification): Document it.
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The 'configure' script deletes the 'core.*' files. Having a file named
'base.scm' instead of 'core.scm' simplifies the build process without
changing the semantics.
* src/mcron/mcron-core.scm: Rename to ...
* src/mcron/base.scm: ... this.
All module users changed.
* Makefile.am (MODULES): Add 'src/mcron/base.scm'.
(CP): Remove variable.
(src/mcron/core.scm): Remove target.
(GEN_MODULES): Remove 'src/mcron/core.scm'.
(dist_mcronmodule_DATA): Remove 'src/mcron/mcron-core.scm'
* doc/mcron.texi: Adapt to name change.
* .gitignore: Update.
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* doc/fdl.texi: New file.
* doc/mcron.texi: Include it.
* makefile.am (doc_mcron_TEXINFOS): New variable.
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* mcron.texinfo.in: Rename to ...
* doc/mcron.texi: ... this.
* doc/config.texi.in: New file.
* configure.ac: Adapt to it.
* makefile.am: Likewise.
* .gitignore: Likewise.
* README--git: Likewise.
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