If you read Jason's message a bit more closely he is conveying that the script's runtime environment has no knowledge of the parameters - not that they can't be used at all.
They are just tokens that have already been 'realized' or replaced into the content by the time the script/task runs. So the scripting environment itself doesn't know that there were parameters used to generate the content to run/execute and you can't meta-program based on them inside the script's logic. (unlike environment variables) I believe this is in reference to the earlier script-based example you gave which is a little confusing. Anyway, seems you have a way forward here for your core requirement. On Tue, 25 Jul 2023, 11:39 Joshua Franta, <jos...@pracplay.com> wrote: > Jason, your knowledge here is off. Parameters can be used in scripts, see > a previous email I this thread that shows how it works. > > On Mon, Jul 24, 2023, 4:11 PM Jason Smyth <jsm...@taqauto.com> wrote: > >> Hi Josh, >> >> I think there may be some confusion here regarding GoCD terminology and >> common concepts. >> >> > i think the main source of confusion is that I thought parameters >> could only be referred to in scripts! >> > I didn't know you could refer to them inside of other configuration >> properties! >> >> To the best of my knowledge, Parameters (GoCD concept) cannot be >> referenced in scripts. You can call a script that uses parameters >> (scripting concept), but as far as I know, GoCD Parameters are not >> persisted in the Agent's runtime environment unless they are somehow passed >> in via the Task definition. Are you sure you aren't thinking of Environment >> Variables (GoCD concept)? Environment Variables can be defined in a few >> different places in GoCD. As the name suggests, these values are persisted >> in the Agent's runtime environment when a Task is executed. >> >> > I still have a question about how this works in examples using >> templates. >> > If we didn't define the pipeline parameter by default, how would gocd >> interpret what I'm guessing would be a blank resource? >> >> If a Template references a Parameter then every Pipeline that uses that >> Template _must_ define that Parameter. Depending on how the Parameter is >> used in the Template, leaving the Parameter Value blank may be valid. >> >> In the case of using Parameters to define Resources, my testing shows >> that each Parameter must define a single, valid, Resource. That is, if you >> want to specify multiple Parameterized Resources, you must use multiple >> Parameters. You cannot, for example, provide a Parameter Value of "foo, >> bar" to make your Pipeline's Job depend on the "foo" and "bar" Resources. >> GoCD rejects the configuration as invalid if you try to save it. Similarly, >> GoCD rejects the configuration as invalid if a Parameter is used in the >> Resource field and you try to leave its Value blank. >> >> Regarding your specific use case, you can solve it using either >> Environments or Resources. The right solution depends on your requirements >> and how you want to reason about your environment. >> >> The way I understand it, in the context of this discussion you have 2 >> groups of Agents (Agents1 and Agents2) and 2 groups of Pipelines >> (PipelinesA and PipelinesB). The Pipelines in PipelinesA can run on any >> Agent, but the Pipelines in PipelinesB must run on the Agents in Agents2. >> We will ignore the fact that Pipelines can contain multiple Stages and >> multiple Jobs and assume either that all of the Pipelines contain a single >> Stage with a single Job, or that the scheduling requirements are the same >> for all Jobs in a given Pipeline. You have also talked about Pipeline >> priority. >> >> Based on this, I assume your requirements are one of the following: >> >> 1. Agents should be used to the full extent possible; the workload in >> PipelinesB is heavier so those Pipelines must not run on Agents1, or >> 2. Pipelines in PipelinesB have a higher priority than those in >> PipelinesA; Agents in Agents2 should take Jobs from PipelinesA only if >> there are no pending Jobs for PipelinesB. >> >> GoCD supports the first scenario. You can achieve this by assigning 2 >> Resources/Environments. Pipelines in PipelinesA get 1 Resource/Environment; >> Pipelines in PipelinesB get the other. Agents in Agents1 get the PipelinesA >> Resource/Environment; Agents in Agents2 get both. >> >> GoCD does not support the concept of priority, so scenario 2 is not >> supported. The best you could accomplish would be to map each group of >> Pipelines to a single group of Agents. >> >> Hope this helps. If I'm way off base it might help me better understand >> your situation if you would provide snippets of your actual configuration. >> >> Cheers, >> Jason >> >> >> On Monday, 24 July 2023 at 11:43:58 UTC-4 Chad Wilson wrote: >> >>> On Mon, Jul 24, 2023 at 8:44 PM Joshua Franta <jos...@pracplay.com> >>> wrote: >>> >>>> >>>> chad thanks for your answer. >>>> >>>> i think the main source of confusion is that I thought parameters could >>>> only be referred to in scripts! >>>> I didn't know you could refer to them inside of other configuration >>>> properties! >>>> Is this documented? Regardless that's super useful, there's probably >>>> some other things that can be cleaned up knowing that. >>>> >>> >>> >>> https://docs.gocd.org/current/configuration/admin_use_parameters_in_configuration.html#rules-around-usage-of-parameters >>> >>> >>> >>>> I tried this on a pipeline w/out any template and it worked as >>>> described. Just put the parameter reference in resource- UI accepts as >>>> long as parameter exists and works. >>>> >>>> I still have a question about how this works in examples using >>>> templates. >>>> If we didn't define the pipeline parameter by default, how would gocd >>>> interpret what I'm guessing would be a blank resource? >>>> >>>> eg we have >>>> >>>> 1. a pipeline template called FAST_OR_SLOW_PIPE >>>> 2. every pipeline implementing this template defines a parameter >>>> called PIPE_RESOURCE_PARAM >>>> >>>> What happens if somebody only defines PIPE_RESOURCE_PARAM when the >>>> pipeline is FAST? >>>> If it's left as empty for ANY-aka-SLOW resources, will gocd >>>> intepret this as a blank resource requirement and fail? >>>> Or will it ignore blank resources? >>>> >>> >>> I'm not sure - perhaps just try it empirically? It could either fail or >>> see it as blank i.e "no resource requirement" - I don't think there's a >>> strong case for either behaviour being more correct. >>> >>> -Chad >>> >>> >>>> On Sun, Jul 23, 2023 at 10:04 AM Chad Wilson <ch...@thoughtworks.com> >>>> wrote: >>>> >>>>> With that description, if you want to use *environments >>>>> <https://docs.gocd.org/current/introduction/concepts_in_go.html#environment>* >>>>> rather than resources >>>>> <https://docs.gocd.org/current/introduction/concepts_in_go.html#resources> >>>>> (and assuming you don't use environments for any other purpose), I would >>>>> >>>>> *1) Create 2 environments "fast" and "any"* >>>>> >>>>> *2) Map agents to environments* >>>>> agents on GROUPA = machines that have less beefy hardware >>>>> *- declare environments "any" when registered* >>>>> >>>>> agents on GROUPB = more expensive machines >>>>> *- declare both environments "fast" and "any" when registered* >>>>> >>>>> *3) When configuring your pipelines* >>>>> >>>>> 1. have a couple of pipelines only run on the more expensive >>>>> machines *<-- add these pipelines to "fast" environment* >>>>> 2. have all other pipelines run in either group (next available >>>>> agent) *<-- add these pipelines to "any" environment* >>>>> >>>>> This should give you roughly the semantics you say you want, but note >>>>> it won't *prioritise* the GROUPB agents for use by the "couple of >>>>> pipelines only run on the more expensive machines", it will just ensure >>>>> they never run on the slower machines/agents. Something equivalent could >>>>> also be done with resources >>>>> <https://docs.gocd.org/current/introduction/concepts_in_go.html#resources> >>>>> . >>>>> >>>>> There is no way to "try another agent" from inside the actual job's >>>>> tasks. In this sense, the contents of tasks/scripts aren't relevant to >>>>> scheduling. The GoCD resources and environments have to be known at >>>>> schedule time. When you use pipeline parameters, they are realised at >>>>> configuration time as when you create a pipeline from a template, it will >>>>> force you to set the parameter values. >>>>> >>>>> To clarify, when you talked earlier about "a resource requirement" are >>>>> you *actually* referring to GoCD's concept of resources, or were you >>>>> talking in a generic sense? The answers are assuming you are talking about >>>>> GoCD resources >>>>> <https://docs.gocd.org/current/introduction/concepts_in_go.html#resources> >>>>> but now I am more confused by your shell script. *If you want to use >>>>> resources* (rather than environments) to affect scheduling, while >>>>> still avoiding duplication of your templates, we are suggesting you use a >>>>> parameter like *this*, not put it into some task content. You are >>>>> setting the parameterized value into the field that determines the job's >>>>> scheduling, not something that happens at execution time like a task. But >>>>> again, if your goal is to control scheduling at pipeline level, for all >>>>> jobs in a pipeline, you don't need to use resources, and can just use >>>>> environments as in my earlier example above. >>>>> >>>>> [image: image.png] >>>>> >>>>> -Chad >>>>> >>>>> >>>>> On Sun, Jul 23, 2023 at 8:21 PM Joshua Franta <jos...@pracplay.com> >>>>> wrote: >>>>> >>>>>> appreciate so many responses. i think we're a little apart so i'll >>>>>> take the suggestion to give our example: >>>>>> >>>>>> GROUPA = machines that have less beefy hardware >>>>>> GROUPB = more expensive machines >>>>>> >>>>>> we'd like to: >>>>>> >>>>>> 1. have a couple of pipelines only run on the more expensive >>>>>> machines >>>>>> 2. have all other pipelines run in either group (next available >>>>>> agent) >>>>>> >>>>>> perhaps this was not clear from my previous explanations, but a >>>>>> couple of people have suggested pipeline parameters. >>>>>> >>>>>> EXAMPLE >>>>>> >>>>>> a pipeline parameter is only going to be available to the job after >>>>>> the job has already been assigned an agent, right? >>>>>> >>>>>> so if i have a pipeline called 'Priority' w/a parameter called >>>>>> "group-id" and the pipeline has a 'Job' that is a shell script: >>>>>> >>>>>> ---- >>>>>> ##!/bin/sh >>>>>> >>>>>> agent_resource="$GO_AGENT_RESOURCE_VARIABLE" >>>>>> >>>>>> if ! echo "#{group-id}" |grep -q "$agentr_esource"; then >>>>>> >>>>>> echo "agent can't run #{group-id} pipelines" >>>>>> >>>>>> ## won't this will make my pipeline fail when I want it to simply >>>>>> try another agent? >>>>>> exit 1 >>>>>> fi >>>>>> >>>>>> ---- >>>>>> >>>>>> or perhaps people saying this know of some environment variable that >>>>>> where we can request another agent? >>>>>> >>>>>> obviously pipeline parameters themseles don't do anything, so i'm >>>>>> confused how i can affect assignment in a job that requires an agent >>>>>> before >>>>>> it runs. >>>>>> this 2nd part is what i don't get above >>>>>> >>>>>> appreciate any clarifications or suggestions thx >>>>>> >>>>>> >>>>>> On Sat, Jul 22, 2023 at 9:58 AM Chad Wilson <ch...@thoughtworks.com> >>>>>> wrote: >>>>>> >>>>>>> >>>>>>> On Sat, Jul 22, 2023 at 8:21 PM Joshua Franta <jos...@pracplay.com> >>>>>>> wrote: >>>>>>> >>>>>>>> re: using environments rather than resources... environments can't >>>>>>>> be defined at the pipeline level either though? >>>>>>>> >>>>>>> >>>>>>> A pipeline is *assigned* to 0 or 1 environments (via the Admin > >>>>>>> Environments UI if not using pipelines-as-code) - thus it's at the >>>>>>> pipeline >>>>>>> level by definition. It defines a scheduling requirement for all jobs in >>>>>>> that pipeline. Which seems what you asked for with "able to communicate >>>>>>> a >>>>>>> resource requirement at the pipeline level" right? >>>>>>> >>>>>>> >>>>>>> or i guess it's more correct to say that using environments is a bit >>>>>>>> of a side-car feature, in that we use interact w/environments through a >>>>>>>> different prisim/ui/config (no biggie) but also seems it's mutually >>>>>>>> exclusive to maximizing overall usage of agents. for us if a given >>>>>>>> host >>>>>>>> can execute something (a pipeline, a job) it should. and if it can't, >>>>>>>> it >>>>>>>> shouldn't. >>>>>>>> trying to force a hard divider can be useful for prod/qa staging, >>>>>>>> but it seems to limit just being able to have pipelines declare their >>>>>>>> needs. >>>>>>>> maybe i'm missing what you're saying but i don't think environments >>>>>>>> are functionally equivalent to resources? >>>>>>>> >>>>>>> >>>>>>> I didn't imply they were functionally equivalent, but I did try to >>>>>>> imply they were a different mechanism of defining a requirement on a >>>>>>> job's >>>>>>> scheduling, at the pipeline level. If a pipeline is assigned to an >>>>>>> "environment", its jobs must be scheduled on agents that also declare >>>>>>> they >>>>>>> support that "environment". Similarly if a pipeline job declares a >>>>>>> resource >>>>>>> requirement, the agent must also have that resource declared for it to >>>>>>> be >>>>>>> assigned. This is a very similar, but different level of configuration >>>>>>> of a >>>>>>> scheduling requirement, no? >>>>>>> https://docs.gocd.org/current/configuration/managing_environments.html >>>>>>> >>>>>>> Anyway, perhaps I don't understand what you are trying to achieve. >>>>>>> If you are currently trying to "prioritise" pipelines by using resources >>>>>>> you can also "prioritise" pipelines by having pools of agents, say, >>>>>>> dedicated to an environment you call "high-priority". As I said, "Don't >>>>>>> need to get hung up on the name [environment]". >>>>>>> >>>>>>> >>>>>>> >>>>>>>> we use template parameters extensively already. >>>>>>>> eg we even templatize further inside our own jobs by re-using >>>>>>>> scripts that interact with template parameters on most commonly used >>>>>>>> templates (eg our most popular template has maybe 10-15 pipelines). >>>>>>>> however this is more of a job specific thing since it's at the job >>>>>>>> level. >>>>>>>> if you're saying we could change every pipeline to read this at a >>>>>>>> pipeline level is a non trivial change to every job. >>>>>>>> >>>>>>> >>>>>>> You said you had many templates that varied only by the "resources" >>>>>>> field for jobs. If that is the stated problem then parameters are a >>>>>>> possible solution to remove duplication, no? >>>>>>> >>>>>>> >>>>>>>> that's ok but i guess my overall question tho would be that if a >>>>>>>> given job decided it couldn't execute the pipeline parameters... it >>>>>>>> has no >>>>>>>> way to pass the job to another agent? >>>>>>>> >>>>>>> >>>>>>> That's the same problem you have currently if the resource is typoed >>>>>>> or wrong inside the template, no? If the resource requirement has no >>>>>>> available agents, then it can't be scheduled. >>>>>>> >>>>>>> >>>>>>>> in such an example it would just fail the job, no? again maybe >>>>>>>> i'm not following but this seems to not allow the business/value level >>>>>>>> to >>>>>>>> declare minimum needs >>>>>>>> (environments seem like they are more about maximimal requirements, >>>>>>>> but i'm no expert) >>>>>>>> >>>>>>> >>>>>>> I'm not following what you're trying to say here, sorry. >>>>>>> >>>>>>> Perhaps this would be easier if you gave a specific example of how >>>>>>> you achieve "have some pipelines that are given higher preferences for >>>>>>> agent/build resources" currently, rather than talking in abstract terms? >>>>>>> >>>>>>> -Chad >>>>>>> >>>>>>> >>>>>>> On Sat, Jul 22, 2023 at 6:56 AM Chad Wilson <ch...@thoughtworks.com> >>>>>>>> wrote: >>>>>>>> >>>>>>>>> Have you tried to use "environments" (or a mix of environments and >>>>>>>>> resources) to achieve what you are trying to? >>>>>>>>> >>>>>>>>> When scheduling jobs it's the combination of the resource and the >>>>>>>>> environment that are matched to an agent, but the relevant >>>>>>>>> environment is >>>>>>>>> declared at the pipeline level like you refer to. Don't need to get >>>>>>>>> hung up >>>>>>>>> on the name so much. Yes, you can have "environment variables" >>>>>>>>> attached to >>>>>>>>> an environment and propagate those to all pipelines within it, but you >>>>>>>>> don't have to use them like that. >>>>>>>>> >>>>>>>>> Alternatively, to make the templates less duplicated and allow the >>>>>>>>> resource to flow from the pipeline *using* the template, you >>>>>>>>> could try using template parameters >>>>>>>>> <https://docs.gocd.org/current/configuration/admin_use_parameters_in_configuration.html> >>>>>>>>> in the resources field? e.g #{job-resoure-requirement}? If there are >>>>>>>>> only a >>>>>>>>> small number of different resources used across the stages/jobs, you >>>>>>>>> could >>>>>>>>> use the parameters to "model" this I imagine. >>>>>>>>> >>>>>>>>> -Chad >>>>>>>>> >>>>>>>>> On Sat, Jul 22, 2023 at 6:54 PM Josh <jos...@pracplay.com> wrote: >>>>>>>>> >>>>>>>>>> QUESTION: >>>>>>>>>> >>>>>>>>>> Shouldn't we also be able to communicate a resource requirement >>>>>>>>>> at the pipeline level, and not just inside a single job? >>>>>>>>>> >>>>>>>>>> I get that it definately needs to be at the job level since >>>>>>>>>> that's the smallest unit of work and some machines can't execute >>>>>>>>>> certain >>>>>>>>>> tasks. >>>>>>>>>> But at the value-stream/pipeline/business level, you also want to >>>>>>>>>> be able to have some pipelines compiling on preferred resources, no? >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> is there a better way to accomplish this? >>>>>>>>>> or perhaps this already is possible and i'm missing it. >>>>>>>>>> i looked closely at the config since sometimes you can do >>>>>>>>>> something simple that is not possible inside the UI, but I'm not >>>>>>>>>> seeing it. >>>>>>>>>> >>>>>>>>>> To restate use case: We have some pipelines that are given >>>>>>>>>> higher preferences for agent/build resources. Wanting to do a lot >>>>>>>>>> more of >>>>>>>>>> this, but it's tricky because resources can only be defined at the >>>>>>>>>> job >>>>>>>>>> level (in the UI). Also we use a lot of templates, so having >>>>>>>>>> resources >>>>>>>>>> at job level means we end up having lots of alsomost identical >>>>>>>>>> templates >>>>>>>>>> that only vary by the resources used (which somewhat defeats the >>>>>>>>>> point of >>>>>>>>>> the templates and the value of gocd in this respect). >>>>>>>>>> >>>>>>>>>> hoping there is a config hack or maybe i'm missinig something. >>>>>>>>>> also if this could be done in a plugin, any color there would be >>>>>>>>>> helpful (and i would make sure it's open sourced if need be). >>>>>>>>>> >>>>>>>>>> thx >>>>>>>>>> >>>>>>>>>> ps i keep using other ci/cd products and gocd is still one of the >>>>>>>>>> all around bests. >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> -- >>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>> Google Groups "go-cd" group. >>>>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>>>> send an email to go-cd+un...@googlegroups.com. >>>>>>>>>> To view this discussion on the web visit >>>>>>>>>> https://groups.google.com/d/msgid/go-cd/a9a4ba2c-b1c9-4202-9408-3e2566929b59n%40googlegroups.com >>>>>>>>>> <https://groups.google.com/d/msgid/go-cd/a9a4ba2c-b1c9-4202-9408-3e2566929b59n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>>>>> . >>>>>>>>>> >>>>>>>>> -- >>>>>>>>> You received this message because you are subscribed to a topic in >>>>>>>>> the Google Groups "go-cd" group. >>>>>>>>> To unsubscribe from this topic, visit >>>>>>>>> https://groups.google.com/d/topic/go-cd/_j5JGmoA2kI/unsubscribe. >>>>>>>>> To unsubscribe from this group and all its topics, send an email >>>>>>>>> to go-cd+un...@googlegroups.com. >>>>>>>>> To view this discussion on the web visit >>>>>>>>> https://groups.google.com/d/msgid/go-cd/CAA1RwH8zGo6mu0ss0jCCyw0D7Hw4JOwEwfcfNu20yqo0aRRdWw%40mail.gmail.com >>>>>>>>> <https://groups.google.com/d/msgid/go-cd/CAA1RwH8zGo6mu0ss0jCCyw0D7Hw4JOwEwfcfNu20yqo0aRRdWw%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>>>>>> . >>>>>>>>> >>>>>>>> -- >>>>>>>> You received this message because you are subscribed to the Google >>>>>>>> Groups "go-cd" group. >>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>> send an email to go-cd+un...@googlegroups.com. >>>>>>>> To view this discussion on the web visit >>>>>>>> https://groups.google.com/d/msgid/go-cd/CABr%2BOtrG%2B0X3y4B6AWnN7N0K-OSpcKb4KdG-LbS8fCnMOR8Zdw%40mail.gmail.com >>>>>>>> <https://groups.google.com/d/msgid/go-cd/CABr%2BOtrG%2B0X3y4B6AWnN7N0K-OSpcKb4KdG-LbS8fCnMOR8Zdw%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>>>>> . >>>>>>>> >>>>>>> -- >>>>>>> You received this message because you are subscribed to a topic in >>>>>>> the Google Groups "go-cd" group. >>>>>>> To unsubscribe from this topic, visit >>>>>>> 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<https://groups.google.com/d/msgid/go-cd/CABr%2BOtr%3D-R3fKE0devgPVKgNbHGVnsn5E5OwxuP%3DMt1No_RNdg%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>>> . >>>>>> >>>>> -- >>>>> You received this message because you are subscribed to a topic in the >>>>> Google Groups "go-cd" group. >>>>> To unsubscribe from this topic, visit >>>>> https://groups.google.com/d/topic/go-cd/_j5JGmoA2kI/unsubscribe. >>>>> To unsubscribe from this group and all its topics, send an email to >>>>> go-cd+un...@googlegroups.com. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/go-cd/CAA1RwH8XmX4y11RT2PVXeUxQd8hvK0UBgbcx8ja-MWuOVqpfag%40mail.gmail.com >>>>> <https://groups.google.com/d/msgid/go-cd/CAA1RwH8XmX4y11RT2PVXeUxQd8hvK0UBgbcx8ja-MWuOVqpfag%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "go-cd" group. >>>> To unsubscribe from this group and stop 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