Repository: containrrr/watchtower
Pull request #748 (2021-01-09 22:56:14)

Fix notifications and old instance cleanup
- Update `shoutrrr` to v0.3.0
- Add support for discord-via-slack URLs
- Clarify errors relating to old watchtower instance cleanup
- Only treat stopping errors as fatal to support multiple scoped watchtowers using the same image


Patch:
diff --git a/go.mod b/go.mod
index 02d1253..87327db 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,8 @@ module github.com/containrrr/watchtower
 
 go 1.12
 
+replace golang.org/x/sys => golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a
+
 require (
 	github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 // indirect
 	github.com/Microsoft/go-winio v0.4.12 // indirect
@@ -15,7 +17,7 @@ require (
 	github.com/cenkalti/backoff v2.2.1+incompatible // indirect
 	github.com/cloudflare/cfssl v0.0.0-20190911221928-1a911ca1b1d6 // indirect
 	github.com/containerd/continuity v0.0.0-20181203112020-004b46473808 // indirect
-	github.com/containrrr/shoutrrr v0.0.0-20200601144753-78bb9685bc2f
+	github.com/containrrr/shoutrrr v0.3.0
 	github.com/docker/cli v0.0.0-20190327152802-57b27434ea29
 	github.com/docker/distribution v2.7.1+incompatible
 	github.com/docker/docker v0.0.0-20190404075923-dbe4a30928d4
@@ -49,15 +51,14 @@ require (
 	github.com/prometheus/client_golang v0.9.3
 	github.com/robfig/cron v0.0.0-20180505203441-b41be1df6967
 	github.com/sirupsen/logrus v1.4.1
-	github.com/spf13/cobra v0.0.3
-	github.com/spf13/pflag v1.0.3
-	github.com/spf13/viper v1.4.0
+	github.com/spf13/cobra v0.0.7
+	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.6.3
 	github.com/stretchr/testify v1.3.0
 	github.com/theupdateframework/notary v0.6.1 // indirect
 	github.com/zmap/zlint v1.0.2 // indirect
 	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 // indirect
 	golang.org/x/net v0.0.0-20191004110552-13f9640d40b9
-	golang.org/x/sys v0.0.0-20190830141801-acfa387b8d69 // indirect
 	golang.org/x/text v0.3.4 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	gopkg.in/dancannon/gorethink.v3 v3.0.5 // indirect
diff --git a/go.sum b/go.sum
index d1d77ae..c2e851a 100644
--- a/go.sum
+++ b/go.sum
@@ -45,11 +45,15 @@ github.com/containerd/continuity v0.0.0-20181203112020-004b46473808 h1:4BX8f882b
 github.com/containerd/continuity v0.0.0-20181203112020-004b46473808/go.mod h1:GL3xCUCBDV3CZiTSEKksMWbLE66hEyuu9qyDOOqM47Y=
 github.com/containrrr/shoutrrr v0.0.0-20200601144753-78bb9685bc2f h1:Ln4yl+CYjrapeTEzMJQpgBwLjruKHcMosWFB/d1M4RQ=
 github.com/containrrr/shoutrrr v0.0.0-20200601144753-78bb9685bc2f/go.mod h1:eotQeC9bHbsf9eMUnXOU/y5bskegseWNB4PwmxRO7Wc=
+github.com/containrrr/shoutrrr v0.3.0 h1:2o1BKQUThSDtcidiMUq99CJijSRDa/nIB8kRhLBYmbk=
+github.com/containrrr/shoutrrr v0.3.0/go.mod h1:gqR3sngKPBVaLrmq9Pfw34x/MXxn0ATjY8/dW+rXzrU=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
+github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -82,8 +86,12 @@ github.com/erikstmartin/go-testdb v0.0.0-20160219214506-8d10e4a1bae5 h1:Yzb9+7DP
 github.com/erikstmartin/go-testdb v0.0.0-20160219214506-8d10e4a1bae5/go.mod h1:a2zkGnVExMxdzMo3M0Hi/3sEU+cWnZpSni0O6/Yb/P0=
 github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
+github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
+github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
+github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
@@ -124,9 +132,11 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
 github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
+github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
 github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51q0aT7Yg=
 github.com/gorilla/mux v1.6.2/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/mux v1.7.0 h1:tOSd0UKHQd6urX6ApfOn4XdBMY6Sh1MfxV3kmaazO+U=
@@ -159,7 +169,9 @@ github.com/johntdyer/slack-go v0.0.0-20180213144715-95fac1160b22/go.mod h1:u0Jo4
 github.com/johntdyer/slackrus v0.0.0-20180518184837-f7aae3243a07 h1:+kBG/8rjCa6vxJZbUjAiE4MQmBEBYc8nLEb51frnvBY=
 github.com/johntdyer/slackrus v0.0.0-20180518184837-f7aae3243a07/go.mod h1:j1kV/8f3jowErEq4XyeypkCdvg5EeHkf0YCKCcq5Ybo=
 github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
+github.com/json-iterator/go v1.1.9/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
+github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
 github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0 h1:iQTw/8FWTuc7uiaSepXwyf3o52HaUYcV+Tu66S3F5GA=
 github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0/go.mod h1:1NbS8ALrpOvjt0rHPNLyCIeMtbizbir8U//inJ+zuB8=
@@ -179,18 +191,30 @@ github.com/lib/pq v1.2.0 h1:LXpIM/LZ5xGFhOpXAQUIMM1HdyqzVYM13zNdjCEEcA0=
 github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/magiconair/properties v1.8.0 h1:LLgXmsheXeRoUOBOjtwPQCWIYqM/LU1ayDtDePerRcY=
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
+github.com/magiconair/properties v1.8.1 h1:ZC2Vc7/ZFkGmsVC9KvOjumD+G5lXy2RtTKyzRKO2BQ4=
+github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/mattn/go-colorable v0.1.2 h1:/bC9yWikZXAL9uJdulbSfyVNIR3n3trXl+v8+1sx8mU=
 github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
+github.com/mattn/go-colorable v0.1.4 h1:snbPLB8fVfU9iwbbo30TPtbLRzwWu6aJS6Xh4eaaviA=
+github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
 github.com/mattn/go-isatty v0.0.8 h1:HLtExJ+uU2HOZ+wI0Tt5DtUDrx8yhUqDcp7fYERX4CE=
 github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-isatty v0.0.11 h1:FxPOTFNqGkuDUGi3H/qkUbQO4ZiBa2brKq5r0l8TGeM=
+github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOAqxQCu2WE=
 github.com/mattn/go-sqlite3 v1.11.0 h1:LDdKkqtYlom37fkvqs8rMPFKAMe8+SgjbwZ6ex1/A/Q=
 github.com/mattn/go-sqlite3 v1.11.0/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/miekg/pkcs11 v0.0.0-20190401114359-553cfdd26aaa h1:gOXc1BXmFuxWYmTfoK51YJR7srco3CwbsVHgr+8Y4r0=
 github.com/miekg/pkcs11 v0.0.0-20190401114359-553cfdd26aaa/go.mod h1:XsNlhZGX73bx86s2hdc/FuaLm2CPZJemRLMA+WTFxgs=
+github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQzvN1EDeE=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
+github.com/mitchellh/mapstructure v1.2.2 h1:dxe5oCinTXiTIcfgmZecdCzPmAJKd46KsCWc35r0TV4=
+github.com/mitchellh/mapstructure v1.2.2/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
+github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
+github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/morikuni/aec v0.0.0-20170113033406-39771216ff4c h1:nXxl5PrvVm2L/wCy8dQu6DMTwH4oIuGN8GJDAlqDdVE=
 github.com/morikuni/aec v0.0.0-20170113033406-39771216ff4c/go.mod h1:BbKIizmSmc5MMPqRYbxO4ZU0S0+P200+tUnFx7PXmsc=
 github.com/mreiferson/go-httpclient v0.0.0-20160630210159-31f0106b4474/go.mod h1:OQA4XLvDbMgS8P0CevmM4m9Q3Jq4phKUzcocxuGJ5m8=
@@ -217,6 +241,8 @@ github.com/opencontainers/runc v0.1.1/go.mod h1:qT5XzbpPznkRYVz/mWwUaVBUv2rmF59P
 github.com/openzipkin/zipkin-go v0.1.6/go.mod h1:QgAqvLzwWbR/WpD4A3cGpPtJrZXNIiJc5AZX7/PBEpw=
 github.com/pelletier/go-toml v1.2.0 h1:T5zMGML61Wp+FlcbWjRDT7yAxhJNAiPPLOFECq181zc=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
+github.com/pelletier/go-toml v1.7.0 h1:7utD74fnzVc/cpcyy8sjrlFr5vYpypUixARcHIMIGuI=
+github.com/pelletier/go-toml v1.7.0/go.mod h1:vwGMzjaWMwyfHwgIBhI2YUM4fB6nL6lVAvS1LBMMhTE=
 github.com/pierrec/lz4 v2.0.5+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
@@ -245,30 +271,48 @@ github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqn
 github.com/robfig/cron v0.0.0-20180505203441-b41be1df6967 h1:x7xEyJDP7Hv3LVgvWhzioQqbC/KtuUhTigKlH/8ehhE=
 github.com/robfig/cron v0.0.0-20180505203441-b41be1df6967/go.mod h1:JGuDeoQd7Z6yL4zQhZ3OPEVHB7fL6Ka6skscFHfmt2k=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/sirupsen/logrus v1.3.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/sirupsen/logrus v1.4.1 h1:GL2rEmy6nsikmW0r8opw9JIRScdMF5hA8cOYLH7In1k=
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+github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
+github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
 github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4kGIyLM=
 github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
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+github.com/spf13/afero v1.2.2 h1:5jhuqJyZCZf2JRofRvN/nIFgIWNzPa3/Vz8mYylgbWc=
+github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
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+github.com/spf13/cast v1.3.1 h1:nFm6S0SMdyzrzcmThSipiEubIDy8WEXKNZ0UOgiRpng=
+github.com/spf13/cast v1.3.1/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
 github.com/spf13/cobra v0.0.3 h1:ZlrZ4XsMRm04Fr5pSFxBgfND2EBVa1nLpiy1stUsX/8=
 github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
+github.com/spf13/cobra v0.0.7 h1:FfTH+vuMXOas8jmfb5/M7dzEYx7LpcLb7a0LPe34uOU=
+github.com/spf13/cobra v0.0.7/go.mod h1:/6GTrnGXV9HjY+aR4k0oJ5tcvakLuG6EuKReYlHNrgE=
 github.com/spf13/jwalterweatherman v1.0.0 h1:XHEdyB+EcvlqZamSM4ZOMGlc93t6AcsBEu9Gc1vn7yk=
 github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
+github.com/spf13/jwalterweatherman v1.1.0 h1:ue6voC5bR5F8YxI5S67j9i582FU4Qvo2bmqnqMYADFk=
+github.com/spf13/jwalterweatherman v1.1.0/go.mod h1:aNWZUN0dPAAO/Ljvb5BEdw96iTZ0EXowPYD95IqWIGo=
 github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
 github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/viper v1.4.0 h1:yXHLWeravcrgGyFSyCgdYpXQ9dR9c/WED3pg1RhxqEU=
 github.com/spf13/viper v1.4.0/go.mod h1:PTJ7Z/lr49W6bUbkmS1V3by4uWynFiR9p7+dSq/yZzE=
+github.com/spf13/viper v1.6.3 h1:pDDu1OyEDTKzpJwdq4TiuLyMsUgRa/BT5cn5O62NoHs=
+github.com/spf13/viper v1.6.3/go.mod h1:jUMtyi0/lB5yZH/FjyGAoH7IMNrIhlBf6pXZmbMDvzw=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1 h1:2vfRuCMp5sSVIDSqO8oNnWJq7mPa6KVP3iPIwFBuy8A=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/subosito/gotenv v1.2.0 h1:Slr1R9HxAlEKefgq5jn9U+DnETlIUa6HfgEzj0g5d7s=
+github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
 github.com/theupdateframework/notary v0.6.1 h1:7wshjstgS9x9F5LuB1L5mBI2xNMObWqjz+cjWoom6l0=
 github.com/theupdateframework/notary v0.6.1/go.mod h1:MOfgIfmox8s7/7fduvB2xyPPMJCrjRLRizA8OFwpnKY=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
@@ -316,6 +360,7 @@ golang.org/x/net v0.0.0-20191004110552-13f9640d40b9 h1:rjwSpXsdiK0dV8/Naq3kAw9ym
 golang.org/x/net v0.0.0-20191004110552-13f9640d40b9/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
+golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -331,12 +376,19 @@ golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO9UxmJRx8K0gsfABByQ=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190830141801-acfa387b8d69 h1:Wdn4Yb8d5VrsO3jWgaeSZss09x1VLVBMePDh4VW/xSQ=
 golang.org/x/sys v0.0.0-20190830141801-acfa387b8d69/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200409092240-59c9f1ba88fa h1:mQTN3ECqfsViCNBgq+A40vdwhkGykrrQlYe3mPj6BoU=
+golang.org/x/sys v0.0.0-20200409092240-59c9f1ba88fa/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2 h1:z99zHgr7hKfrUcX/KsoJk5FJfjTceCKIp96+biqP4To=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.4 h1:0YWbFKbhXG/wIiuHDSKpS0Iy7FSA+u45VtBMfQcFTTc=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -349,6 +401,7 @@ golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
@@ -387,6 +440,9 @@ gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/gorethink/gorethink.v3 v3.0.5 h1:e2Uc/Xe+hpcVQFsj6MuHlYog3r0JYpnTzwDj/y2O4MU=
 gopkg.in/gorethink/gorethink.v3 v3.0.5/go.mod h1:+3yIIHJUGMBK+wyPH+iN5TP+88ikFDfZdqTlK3Y9q8I=
+gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/ini.v1 v1.55.0 h1:E8yzL5unfpW3M6fz/eB7Cb5MQAYSZ7GKo4Qth+N2sgQ=
+gopkg.in/ini.v1 v1.55.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
@@ -395,6 +451,7 @@ gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gosrc.io/xmpp v0.1.1 h1:iMtE9W3fx254+4E6rI34AOPJDqWvpfQR6EYaVMzhJ4s=
diff --git a/internal/actions/check.go b/internal/actions/check.go
index aeff0cd..87133fc 100644
--- a/internal/actions/check.go
+++ b/internal/actions/check.go
@@ -1,15 +1,12 @@
 package actions
 
 import (
-	"errors"
 	"fmt"
 	"sort"
-	"strings"
 	"time"
 
 	"github.com/containrrr/watchtower/pkg/filters"
 	"github.com/containrrr/watchtower/pkg/sorter"
-
 	"github.com/sirupsen/logrus"
 
 	log "github.com/sirupsen/logrus"
@@ -40,7 +37,6 @@ func CheckForMultipleWatchtowerInstances(client container.Client, cleanup bool,
 }
 
 func cleanupExcessWatchtowers(containers []container.Container, client container.Client, cleanup bool) error {
-	var cleanupErrors int
 	var stopErrors int
 
 	sort.Sort(sorter.ByCreated(containers))
@@ -49,37 +45,23 @@ func cleanupExcessWatchtowers(containers []container.Container, client container
 	for _, c := range allContainersExceptLast {
 		if err := client.StopContainer(c, 10*time.Minute); err != nil {
 			// logging the original here as we're just returning a count
-			logrus.Error(err)
+			logrus.WithError(err).Error("Could not stop a previous watchtower instance.")
 			stopErrors++
 			continue
 		}
 
 		if cleanup {
 			if err := client.RemoveImageByID(c.ImageID()); err != nil {
-				// logging the original here as we're just returning a count
-				logrus.Error(err)
-				cleanupErrors++
+				logrus.WithError(err).Warning("Could not cleanup watchtower images, possibly because of other watchtowers instances in other scopes.")
 			}
 		}
 	}
 
-	return createErrorIfAnyHaveOccurred(stopErrors, cleanupErrors)
-}
-
-func createErrorIfAnyHaveOccurred(c int, i int) error {
-	if c == 0 && i == 0 {
-		return nil
+	if stopErrors > 0 {
+		return fmt.Errorf("%d errors while stopping watchtower containers", stopErrors)
 	}
 
-	var output strings.Builder
-
-	if c > 0 {
-		output.WriteString(fmt.Sprintf("%d errors while stopping containers", c))
-	}
-	if i > 0 {
-		output.WriteString(fmt.Sprintf("%d errors while cleaning up images", c))
-	}
-	return errors.New(output.String())
+	return nil
 }
 
 func awaitDockerClient() {
diff --git a/pkg/notifications/email.go b/pkg/notifications/email.go
index 2356978..184bf84 100644
--- a/pkg/notifications/email.go
+++ b/pkg/notifications/email.go
@@ -1,9 +1,11 @@
 package notifications
 
 import (
+	"fmt"
 	"os"
 	"time"
 
+	"github.com/containrrr/shoutrrr/pkg/format"
 	"github.com/spf13/cobra"
 
 	shoutrrrSmtp "github.com/containrrr/shoutrrr/pkg/services/smtp"
@@ -75,10 +77,16 @@ func (e *emailTypeNotifier) GetURL() string {
 		UseHTML:     false,
 	}
 
+	pkr := format.NewPropKeyResolver(conf)
+	var err error
 	if len(e.User) > 0 {
-		conf.Set("auth", "Plain")
+		err = pkr.Set("auth", "Plain")
 	} else {
-		conf.Set("auth", "None")
+		err = pkr.Set("auth", "None")
+	}
+
+	if err != nil {
+		fmt.Printf("Could not set auth type for email notifier: %v", err)
 	}
 
 	return conf.GetURL().String()
diff --git a/pkg/notifications/slack.go b/pkg/notifications/slack.go
index f8cbd45..ede7141 100644
--- a/pkg/notifications/slack.go
+++ b/pkg/notifications/slack.go
@@ -3,6 +3,7 @@ package notifications
 import (
 	"strings"
 
+	shoutrrrDisco "github.com/containrrr/shoutrrr/pkg/services/discord"
 	shoutrrrSlack "github.com/containrrr/shoutrrr/pkg/services/slack"
 	t "github.com/containrrr/watchtower/pkg/types"
 	"github.com/johntdyer/slackrus"
@@ -31,6 +32,7 @@ func newSlackNotifier(c *cobra.Command, acceptedLogLevels []log.Level) t.Convert
 	channel, _ := flags.GetString("notification-slack-channel")
 	emoji, _ := flags.GetString("notification-slack-icon-emoji")
 	iconURL, _ := flags.GetString("notification-slack-icon-url")
+
 	n := &slackTypeNotifier{
 		SlackrusHook: slackrus.SlackrusHook{
 			HookURL:        hookURL,
@@ -45,16 +47,25 @@ func newSlackNotifier(c *cobra.Command, acceptedLogLevels []log.Level) t.Convert
 }
 
 func (s *slackTypeNotifier) GetURL() string {
+	trimmedURL := strings.TrimRight(s.HookURL, "/")
+	trimmedURL = strings.TrimLeft(trimmedURL, "https://")
+	parts := strings.Split(trimmedURL, "/")
+
+	if parts[0] == "discord.com" || parts[0] == "discordapp.com" {
+		log.Debug("Detected a discord slack wrapper URL, using shoutrrr discord service")
+		conf := &shoutrrrDisco.Config{
+			Channel: parts[len(parts)-3],
+			Token:   parts[len(parts)-2],
+		}
+		return conf.GetURL().String()
+	}
+
 	rawTokens := strings.Replace(s.HookURL, "https://hooks.slack.com/services/", "", 1)
 	tokens := strings.Split(rawTokens, "/")
 
 	conf := &shoutrrrSlack.Config{
 		BotName: s.Username,
-		Token: shoutrrrSlack.Token{
-			A: tokens[0],
-			B: tokens[1],
-			C: tokens[2],
-		},
+		Token:   tokens,
 	}
 
 	return conf.GetURL().String()


Test patch:
diff --git a/pkg/api/metrics/metrics_test.go b/pkg/api/metrics/metrics_test.go
index c1a4df0..156601f 100644
--- a/pkg/api/metrics/metrics_test.go
+++ b/pkg/api/metrics/metrics_test.go
@@ -55,7 +55,7 @@ var _ = Describe("the metrics", func() {
 
 		Expect(err).NotTo(HaveOccurred())
 		contents, err := ioutil.ReadAll(res.Body)
-		fmt.Printf("%s\n", string(contents))
+
 		Expect(string(contents)).To(ContainSubstring("watchtower_containers_updated 3"))
 		Expect(string(contents)).To(ContainSubstring("watchtower_containers_failed 1"))
 		Expect(string(contents)).To(ContainSubstring("watchtower_containers_scanned 4"))
@@ -69,9 +69,8 @@ var _ = Describe("the metrics", func() {
 		res, err = getWithToken(c, "http://localhost:8080/v1/metrics")
 		Expect(err).NotTo(HaveOccurred())
 		contents, err = ioutil.ReadAll(res.Body)
-		fmt.Printf("%s\n", string(contents))
 
 		Expect(string(contents)).To(ContainSubstring("watchtower_scans_total 4"))
 		Expect(string(contents)).To(ContainSubstring("watchtower_scans_skipped 3"))
 	})
-})
\ No newline at end of file
+})
diff --git a/pkg/notifications/notifier_test.go b/pkg/notifications/notifier_test.go
index 6440bbc..57132ac 100644
--- a/pkg/notifications/notifier_test.go
+++ b/pkg/notifications/notifier_test.go
@@ -22,19 +22,32 @@ func TestActions(t *testing.T) {
 }
 
 var _ = Describe("notifications", func() {
-	// TODO: Either, we delete this test or we need to pass it valid URLs in the cobra command.
-	// ---
-	// When("getting notifiers from a types array", func() {
-	// 	It("should return the same amount of notifiers a string entries", func() {
-
-	// 		notifier := &notifications.Notifier{}
-	// 		notifiers := notifier.GetNotificationTypes(&cobra.Command{}, []log.Level{}, []string{"slack", "email"})
-	// 		Expect(len(notifiers)).To(Equal(2))
-	// 	})
-	// })
 	Describe("the slack notifier", func() {
+		builderFn := notifications.NewSlackNotifier
+
+		When("passing a discord url to the slack notifier", func() {
+			channel := "123456789"
+			token := "abvsihdbau"
+			expected := fmt.Sprintf("discord://%s@%s", token, channel)
+			buildArgs := func(url string) []string {
+				return []string{
+					"--notifications",
+					"slack",
+					"--notification-slack-hook-url",
+					url,
+				}
+			}
+
+			It("should return a discord url when using a hook url with the domain discord.com", func() {
+				hookURL := fmt.Sprintf("https://%s/api/webhooks/%s/%s/slack", "discord.com", channel, token)
+				testURL(builderFn, buildArgs(hookURL), expected)
+			})
+			It("should return a discord url when using a hook url with the domain discordapp.com", func() {
+				hookURL := fmt.Sprintf("https://%s/api/webhooks/%s/%s/slack", "discordapp.com", channel, token)
+				testURL(builderFn, buildArgs(hookURL), expected)
+			})
+		})
 		When("converting a slack service config into a shoutrrr url", func() {
-			builderFn := notifications.NewSlackNotifier
 
 			It("should return the expected URL", func() {
 
@@ -43,9 +56,8 @@ var _ = Describe("notifications", func() {
 				tokenB := "bbb"
 				tokenC := "ccc"
 
-				password := fmt.Sprintf("%s-%s-%s", tokenA, tokenB, tokenC)
 				hookURL := fmt.Sprintf("https://hooks.slack.com/services/%s/%s/%s", tokenA, tokenB, tokenC)
-				expectedOutput := fmt.Sprintf("slack://%s:%s@%s/%s/%s", username, password, tokenA, tokenB, tokenC)
+				expectedOutput := fmt.Sprintf("slack://%s@%s/%s/%s", username, tokenA, tokenB, tokenC)
 
 				args := []string{
 					"--notification-slack-hook-url",
@@ -144,8 +156,8 @@ func buildExpectedURL(username string, password string, host string, port int, f
 
 	subject := fmt.Sprintf("Watchtower updates on %s", hostname)
 
-	var template = "smtp://%s:%s@%s:%d/?fromAddress=%s&fromName=Watchtower&toAddresses=%s&auth=%s&subject=%s&startTls=Yes&useHTML=No"
-	return fmt.Sprintf(template, username, password, host, port, from, to, auth, subject)
+	var template = "smtp://%s:%s@%s:%d/?auth=%s&encryption=None&fromaddress=%s&fromname=Watchtower&starttls=Yes&subject=%s&toaddresses=%s&usehtml=No"
+	return fmt.Sprintf(template, username, password, host, port, auth, from, subject, to)
 }
 
 type builderFn = func(c *cobra.Command, acceptedLogLevels []log.Level) types.ConvertableNotifier