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* gnu/services/herd.scm (with-shepherd): Use 'dynamic-wind' and close
CONNECTION at the end.
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Fixes a regression introduced in
0642838b2e9ab2bd988dccb64b9e1130006347bf.
* gnu/services/herd.scm (invoke-action): Explain that we get a list of
results.
(current-services): Expect a list of result and use the first one.
(unload-service, %load-file, eval-there): Likewise.
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* gnu/services/herd.scm (stop-service): New procedure.
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Previously the match expression case for a successful response
(where error is #f) required that the result component contained a list with a
single element.
As far as I see when looking at the responses from the shepherd, this is not
normally the case. Therefore, to avoid treating successful responses as
errors, make the match requirement more permissive, accepting any value.
* gnu/services/herd.scm (invoke-action): Change match condition for ok responses.
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* gnu/services/herd.scm (%shepherd-socket-file): Make it an exported
parameter.
(open-connection): Adapt.
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* gnu/services/herd.scm (<live-service>): New record type.
(current-services): Change to return a single value: #f or a list of
<live-service>.
* guix/scripts/system.scm (call-with-service-upgrade-info): Adjust
accordingly.
* gnu/tests/base.scm (run-basic-test)["shepherd services"]: Adjust
accordingly.
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* guix/utils.scm (compile-time-value, memoize, fold2)
(fold-tree, fold-tree-leaves): Move to...
* guix/combinators: ... here. New file.
* tests/utils.scm ("fold2, 1 list", "fold2, 2 lists")
(fold-tree tests): Move to...
* tests/combinators.scm: ... here. New file.
* Makefile.am (MODULES, SCM_TESTS): Add them.
* gnu/packages.scm, gnu/packages/bootstrap.scm,
gnu/services/herd.scm, guix/build-system/gnu.scm,
guix/build-system/python.scm, guix/derivations.scm,
guix/gnu-maintenance.scm, guix/import/elpa.scm,
guix/scripts/archive.scm, guix/scripts/build.scm,
guix/scripts/graph.scm, guix/scripts/lint.scm,
guix/scripts/size.scm, guix/scripts/substitute.scm,
guix/serialization.scm, guix/store.scm, guix/ui.scm: Adjust imports
accordingly.
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This makes (gnu services herd) independent of (guix ui).
* gnu/services/herd.scm (&shepherd-error, &service-not-found-error)
(&action-not-found-error, &action-exception-error)
(&unknown-shepherd-error): New error condition types.
(report-action-error): Remove.
(raise-shepherd-error): New procedure.
(display-message): Do not use 'info' and '_'.
(invoke-action): Use 'raise-shepherd-error' instead of
'report-action-error'. Do not use 'warning'.
(current-services): Do not use 'warning'.
* guix/scripts/system.scm (with-shepherd-error-handling): New macro.
(report-shepherd-error, call-with-service-upgrade-info): New
procedures.
(upgrade-shepherd-services): Use it.
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* gnu/services/herd.scm (report-action-error): Add missing newlines in
messages.
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Before that 'open-connection' would return #f, and thus
'current-services' would return a single #f value when its continuation
expects two.
Reported by calher on #guix.
* gnu/services/herd.scm (open-connection): Rethrow system-error
exceptions.
(with-shepherd): Expect CONNECTION to always be true; remove useless
'dynamic-wind'.
* guix/scripts/system.scm (warn-on-system-error): New macro.
(upgrade-shepherd-services): Wrap body in 'warn-on-system-error'.
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Partly fixes <http://bugs.gnu.org/22039>.
* gnu/services/herd.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/services/shepherd.scm (shepherd-service-canonical-name): New
procedure.
(shepherd-service-file): Export.
* guix/scripts/system.scm (upgrade-shepherd-services): New procedure.
(switch-to-system): Use it.
* guix/ui.scm (info): New procedure.
* doc/guix.texi (Invoking guix system): Mention system services.
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