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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: guix-devel-bounces+larch=yhetil.org@gnu.org X-Migadu-Flow: FLOW_IN X-Migadu-Country: US X-Migadu-Queue-Id: C28848002C X-Migadu-Scanner: mx13.migadu.com X-Migadu-Spam-Score: -10.13 X-Spam-Score: -10.13 X-TUID: WephHnx+NHya Hi! Efraim Flashner skribis: > 0.2.0 is now out! > 100% fewer GOOPS! > 'shepherd-run --version' now returns the correct string! Wo0t! Inspired by shepherd-run, I thought =E2=80=9Chey let=E2=80=99s add this to = Shepherd proper for 1.0, easy!=E2=80=9D. Turns out that finding a way to pass the various options (=E2=80=98-d=E2=80=99, =E2=80=98-E=E2=80=99, etc.) to the a= ction that spawns a service was still an open issue. Solution: add these options to =E2=80=98herd=E2= =80=99, and have it pass them as keyword arguments to the action that=E2=80=99s invoked. That=E2=80=99s allowed me to unify =E2=80=98herd schedule timer=E2=80=99 an= d the new =E2=80=98herd spawn transient=E2=80=99 (the name of the Awk-less GOOPS-less C-less =E2=80=98sys= temd-run=E2=80=99). Here=E2=80=99s the doc: --8<---------------cut here---------------start------------->8--- The =E2=80=9Ctransient service maker=E2=80=9D lets you run commands in the = background, and it does so by wrapping those commands in transient services (*note Defining Services::). It is similar to the =E2=80=98systemd-run=E2=80=99 (https://www.freedesktop.org/software/systemd/man/latest/systemd-run.html) command, which you might have encountered before. A simple configuration file that uses this service looks like this: (use-modules (shepherd service transient)) (register-services (list (transient-service))) This creates a service called =E2=80=98transient=E2=80=99 that has a =E2= =80=98spawn=E2=80=99 action, which you can use like this: # Run 'make' from the current directory. herd spawn transient -d "$PWD" -- make -j4 # Run 'rsync' from the home directory, inheriting # the 'SSH_AUTH_SOCK' environment variable. herd spawn transient \ --log-file=3Dbackup.log \ -E SSH_AUTH_SOCK=3D$SSH_AUTH_SOCK -- \ rsync -e ssh -vur . backup.example.org: Each of these =E2=80=98herd spawn transient=E2=80=99 commands creates a = new transient service. Like any other service, they can be inspected and stopped. Running =E2=80=98herd stop transient=E2=80=99 stops all the currently runni= ng transients. The command runs from the directory specified by =E2=80=98default-service-directory=E2=80=99 or from that specified by the =E2=80=98--working-directory=E2=80=99 option of =E2=80=98herd=E2=80=99; it = has with the environment variables in =E2=80=98default-environment-variables=E2=80=99, augmented wit= h =E2=80=98HOME=E2=80=99 when running as a different user, with the addition of variables passed with =E2=80=98--environment-variable=E2=80=99. *Note Invoking herd::, for more = info on influential command-line options. -- Procedure: transient-service [PROVISION] [#:requirement '()] Return a service with the given PROVISION and REQUIREMENT. The service has a =E2=80=98spawn=E2=80=99 action that lets users run comma= nds in the background. --8<---------------cut here---------------end--------------->8--- It=E2=80=99s too big a change in between two release candidates, but it see= med better to get that right before 1.0. Lemme know what you think! Ludo=E2=80=99.