The idea of a secrets plugin operations is that the secret of secrets file[2] is published in the container under the variable $testvar2 not with this task[1]?
[1] { "id": "/test/test-secrets", "instances": 1, "cpus": 1, "mem": 32, "cmd": "while [ true ]; do echo $(date +'%m%d %H%M%S'): $HOSTNAME $testvar1 $testvar2 >> file ; env >> file ; sleep 15 ; done", "acceptedResourceRoles": ["*"], "constraints": [["hostname", "CLUSTER", "m01.local"]], "backoffSeconds": 10, "networks": [ { "mode": "host" } ], "env": { "testvar1": "testval1", "testvar2": { "secret": "secretpassword"} }, "secrets": { "secretpassword": { "source": "testagain" } }, "container": { "type": "MESOS" } } [2] { "secrets": { "testagain": { "target": [ { "app": "/test/" } ], "value": "LS0tLS1CRUdJTiBQS0NTNy0tLS0tCk1JSUNpUVlKS29aSWh2Y05BUWNEb0lJQ2VqQ0NBbll DQVFBeGdnSTZNSUlDTmdJQkFEQWVNQkV4RHpBTkJnTlYKQkFNTUJsQkxRMU1qTndJSkFKM3E 0eW1QYlYyVU1BMEdDU3FHU0liM0RRRUJBUVVBQklJQ0FIL1A1K0c0TFlhMwpkdnhndkdLVyt 6aGxFUTFqYzhDN1FXc1NBWTNqLzBxWEZOeHBmMUNlUGtoMnYwNlh4ZkhCR0hXYVZLOEZMMTN rCnZxRmptclNSNzVQNXFVRHNwcWFuWTJucG1YNmpHaWxRQ1k2UkxKWHZIeWdld0k4UWFQazc wM1pPN3BOUmM1QWMKVjNYc0lxVCtySXZiL1cxSzY5YWJEZlBPb1F2aTA2NkNGbDB2V2F2dkc rdmFkSndJZXhpOGE3NEpZN0hVQWNmegpDMlJIcUs3RlUrYkl4SElxUE5POTFGR3MwUHlPcFJ ZS1dsditEWEUvQ0NkSUZjdWhlaHRCT1UvbUtYN3JhYk4wCjNwdFFDTEhLN085cTlidkhlRHl MSDJkTmY5amFsam5TcXZ4Q2ZIa2gyTUJzcVVUOWUyZHl5RS84ZTFCS1ZTSncKUW5TRFFrQVJ wUHF0ZzZlc0QyRTYzeEVDeklhbDFJelBDT1NMNEVpbjVtN2FualBPcTAzZ3N5WkVYQUtxTlh wcApaUHM2c0d5RFVsanNpRURjZ2MzMXIxRXFNMVMyLzl6aXRveUx5eEpzS0pVM2lTaXVqQjJ xNHdlSjZRYnBpQWlvCks5aUZzVDZ1QUNjMjdnM2xJMUVhWlhIQTJGSzRtUERmcWlhQUZ1L0p 2bEU5aDRLZStGeGZSZ01zVTBxVzR3ZzYKMU9DOS9aWEFUcWpqSEM4WVZIN0dzTXRZeHlscWV DQzloMmdUdlpFVjRLWVpEN1dablBoRzd6eHZhclQyeU1IWgpBTmNyQ1pOdUZYNzQ0TzlBMXh CMEx5citNUDNtTkRwOVlrRGF3QmM3R2ljZFJFZ3R0c1NFalhySFdJZTdSZUdECk43d1NWQ0F zcDM3MDdrQ0VHYXU3Z2lOMzNDenJmaGJYTURNR0NTcUdTSWIzRFFFSEFUQVVCZ2dxaGtpRzl 3MEQKQndRSWJrUElOWlQ5REErQUVKVERCUDlnRG55ZFlpTy83a2tJUS84PQotLS0tLUVORCB QS0NTNy0tLS0tCg==" }, "some.test.value": { "value": "LS0tLS1CRUdJTiBQS0NTNy0tLS0tCk1JSUNpUVlKS29aSWh2Y05BUWNEb0lJQ2VqQ0NBbll DQVFBeGdnSTZNSUlDTmdJQkFEQWVNQkV4RHpBTkJnTlYKQkFNTUJsQkxRMU1qTndJSkFKM3E 0eW1QYlYyVU1BMEdDU3FHU0liM0RRRUJBUVVBQklJQ0FIL1A1K0c0TFlhMwpkdnhndkdLVyt 6aGxFUTFqYzhDN1FXc1NBWTNqLzBxWEZOeHBmMUNlUGtoMnYwNlh4ZkhCR0hXYVZLOEZMMTN rCnZxRmptclNSNzVQNXFVRHNwcWFuWTJucG1YNmpHaWxRQ1k2UkxKWHZIeWdld0k4UWFQazc wM1pPN3BOUmM1QWMKVjNYc0lxVCtySXZiL1cxSzY5YWJEZlBPb1F2aTA2NkNGbDB2V2F2dkc rdmFkSndJZXhpOGE3NEpZN0hVQWNmegpDMlJIcUs3RlUrYkl4SElxUE5POTFGR3MwUHlPcFJ ZS1dsditEWEUvQ0NkSUZjdWhlaHRCT1UvbUtYN3JhYk4wCjNwdFFDTEhLN085cTlidkhlRHl MSDJkTmY5amFsam5TcXZ4Q2ZIa2gyTUJzcVVUOWUyZHl5RS84ZTFCS1ZTSncKUW5TRFFrQVJ wUHF0ZzZlc0QyRTYzeEVDeklhbDFJelBDT1NMNEVpbjVtN2FualBPcTAzZ3N5WkVYQUtxTlh wcApaUHM2c0d5RFVsanNpRURjZ2MzMXIxRXFNMVMyLzl6aXRveUx5eEpzS0pVM2lTaXVqQjJ xNHdlSjZRYnBpQWlvCks5aUZzVDZ1QUNjMjdnM2xJMUVhWlhIQTJGSzRtUERmcWlhQUZ1L0p 2bEU5aDRLZStGeGZSZ01zVTBxVzR3ZzYKMU9DOS9aWEFUcWpqSEM4WVZIN0dzTXRZeHlscWV DQzloMmdUdlpFVjRLWVpEN1dablBoRzd6eHZhclQyeU1IWgpBTmNyQ1pOdUZYNzQ0TzlBMXh CMEx5citNUDNtTkRwOVlrRGF3QmM3R2ljZFJFZ3R0c1NFalhySFdJZTdSZUdECk43d1NWQ0F zcDM3MDdrQ0VHYXU3Z2lOMzNDenJmaGJYTURNR0NTcUdTSWIzRFFFSEFUQVVCZ2dxaGtpRzl 3MEQKQndRSWJrUElOWlQ5REErQUVKVERCUDlnRG55ZFlpTy83a2tJUS84PQotLS0tLUVORCB QS0NTNy0tLS0tCg==", "target": [ { "app": "/group/app-v1.2.4" } ] }, "other.secret.pass": { "value": "LS0tLS1CRUdJTiBQS0NTNy0tLS0tCk1JSUNpUVlKS29aSWh2Y05BUWNEb0lJQ2VqQ0NBbll DQVFBeGdnSTZNSUlDTmdJQkFEQWVNQkV4RHpBTkJnTlYKQkFNTUJsQkxRMU1qTndJSkFKM3E 0eW1QYlYyVU1BMEdDU3FHU0liM0RRRUJBUVVBQklJQ0FBd2lGMk1yWVhNcQorRDFhc1hTZVl pNWxLRW9wTGI0YnVXSW9QNzQ4T1psQ0Y5bUkzNUJZbTdLWlROU0pjaDdRcUVRaU4wMjVUaEx xCjIzeDhSb3dHL21rOWc5RFUzQmpnWDFmck9TSUU1UW5HWE5aVTV3VmFKOGJZQk8wODMxTXI 0cEh2NmZGWEhQTDgKRWRzeGdSRFJHNHFIS3FUcW1jTW4zQlU1QW5BRzRQc3FLSVUyVGV2N3F CWlYvUXBZWHBuZ29LVEtVNlVEMzAxVQpBaUt6eUtHc25vVjVaMDh0a3R6S0ZQaFJHZ3hjRE1 HQ3ZMWklFNkZUbDJTS0ZnMGF1UXIrUDFsYkZPZWJ4dDhZClJjaU5SbXlsRitZZTRrUVQ0bWh aYVlqcWl2TXhoWnJKUmtoRy9GQnV5OHRRYy9wa3VFQjl0NHZlcUY3OGVVUDkKcHBsZnRTYm8 rVlJKeE9kOGtDd3JUbWRlVW9tZ1BiVjFtdWhJZURpR3VUSS9CdjU5L3JZb1J4ZzJPYW5LcU9 lVgphakpMZi9aVmUzRU5WUEdaY0FIdm1rSWxnczl3T3VXdHJER1JhUHBTUE9IN2pMYURqaDR WTUx5K0VxaEhBVVFoCkF2a2dEMjRhVWkzd2tabFZDd1poV3RkdGtybTRzSHo1MEh4MzVDdVl lWllSVk9kNHNqZUw4QzJkRWR1ODVnN3kKR1F5dWRmbkMvZCtCZmpzR3QxZ0ZvN0NWT0hFaWp XN3VrWi82eVhiOG5qaTh0TVJ2ZHJMV2tHb1F2QzB0d0NFbwp5VXp6SCtUQ0ZnVnNLZTJ3Sit nK2t0VjErRFR1UkQ2RjFQdTVvV0tKa0V5dE1oSll6elNSOHQ0MVZuRnhnbTg0CnF4NnpOMEk 4aUVjVFhZN2l6RGFuL0hUQzljNTVPZTZLTURNR0NTcUdTSWIzRFFFSEFUQVVCZ2dxaGtpRzl 3MEQKQndRSUw3eFRmTS9EdDZhQUVNRTVJUXJWNjRuKzgyTzd1aC8raEJvPQotLS0tLUVORCB QS0NTNy0tLS0tCg==", "target": [ { "app": "/group/" } ] } } }