Merge branch 'main' into patch-1

srl-labs · Nov 22, 2021 · 8ca32b7 · 8ca32b7
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diff --git a/.gitignore b/.gitignore
@@ -11,6 +11,8 @@ rpm/*
 dist
 private
 clab-*
+clab/.*.yaml
+clab/.*.yml
 
 # Test binary, built with `go test -c`
 *.test

diff --git a/docs/community.md b/docs/community.md
@@ -10,17 +10,19 @@ Everybody is welcome to join and chat with our community members about all thing
 ## In The Media
 We are always happy to showcase containerlab and demonstrate its powers. Luckily, the network engineering community has lots of events worldwide, and we participated in some. Below you will find recordings of containerlab talks in different formats and on various venues listed in reverse chronological order[^1].
 
-### Containerlab Makes Container And VM Networking Labs Easy
-<small>:material-podcast: Podcast · [Packet Pushers](https://packetpushers.net/podcast/tech-bytes-containerlab-makes-container-and-vm-networking-labs-easy-sponsored/) · :material-calendar: 2021-11-15</small>
+### Packet Pushers Tech Bytes
+<small>:material-podcast: [Containerlab Makes Container And VM Networking Labs Easy](https://packetpushers.net/podcast/tech-bytes-containerlab-makes-container-and-vm-networking-labs-easy-sponsored/) · :material-calendar: 2021-11-15</small>
 
 A short, 14 minutes long introductory talk about Containerlab. If you wanted to know what containerlab is, but all you have is 15 minutes break - go check it out.
 
+<div class="iframe-audio2-container">
 <iframe width="320" height="30" src="https://packetpushers.net/?powerpress_embed=52038-podcast&amp;powerpress_player=mediaelement-audio" frameborder="0" scrolling="no"></iframe>
+</div>
 
 Participants: [:material-twitter:][rdodin-twitter][:material-linkedin:][rdodin-linkedin] Roman Dodin
 
-### Containerlab - running networking labs with Docker UX
-<small>:material-youtube: Screencast · [NANOG 83](https://www.youtube.com/watch?v=qigCla1qY3k) · :material-calendar: 2021-11-03</small>
+### NANOG 83
+<small>:material-youtube: [Containerlab - running networking labs with Docker UX](https://www.youtube.com/watch?v=qigCla1qY3k) · :material-calendar: 2021-11-03</small>
 
 Our very first NANOG appearance and we went full-steam there. This talk is the most comprehensive containerlab tutorial captured to that date. It starts with the basics and escalates to the [advanced DC fabric deployment](https://youtu.be/qigCla1qY3k?t=2131) with HA telemetry cluster created. All driven by a single containerlab topology file.
 
@@ -33,8 +35,8 @@ Participants:
 * [:material-twitter:][rdodin-twitter][:material-linkedin:][rdodin-linkedin] Roman Dodin
 * [:material-linkedin:][karim-linkedin] Karim Radhouani
 
-### Containerlab - a Modern way to Deploy Networking Topologies for Labs, CI, and Testing
-<small>:material-youtube: Screencast · [Open Networking & Edge Summit 2021](https://www.youtube.com/watch?v=snQTlFahY1c) · :material-calendar: 2021-10-11</small>
+### Open Networking & Edge Summit 2021
+<small>:material-youtube: [Containerlab - a Modern way to Deploy Networking Topologies for Labs, CI, and Testing](https://www.youtube.com/watch?v=snQTlFahY1c) · :material-calendar: 2021-10-11</small>
 
 This 30mins screencast introduces containerlab by going through a multivendor lab example consisting of Nokia SR Linux, Arista cEOS, and GoBGP containers participating in a route reflection scenario.
 
@@ -46,8 +48,8 @@ The talk starts with the reasoning as to why containerlab development was warran
 
 Participants: [:material-twitter:][rdodin-twitter][:material-linkedin:][rdodin-linkedin] Roman Dodin
 
-### Containerlab at NLNOG 2021
-<small>:material-youtube: Screencast · [NLNOG 2021](https://www.youtube.com/watch?v=n81Tc1g4W5U) · :material-calendar: 2021-09-05</small>
+### NLNOG 2021
+<small>:material-youtube: [Running networking labs with Docker User Experience](https://www.youtube.com/watch?v=n81Tc1g4W5U) · :material-calendar: 2021-09-05</small>
 
 The first public talk around containerlab happened in the Netherlands at an in-person (sic!) networking event NLNOG 2021.
 
@@ -57,6 +59,17 @@ The first public talk around containerlab happened in the Netherlands at an in-p
 
 Participants: [:material-twitter:][rdodin-twitter][:material-linkedin:][rdodin-linkedin] Roman Dodin
 
+### Modem Podcast s01e10
+<small>:material-youtube: [Containerlab: Declarative network labbing](https://www.modem.show/post/s01e10/) · :material-calendar: 2021-06-06</small>
+
+Building large-scale network labs can be tedious and error prone—More importantly, they can be notoriously hard to spin up automatically. Containerlab is a new tool that promises to “redefine the way you run networking labs” and I really think it hits that target. On this episode of the Modulate Demodulate podcast, Nick and Chris C. are joined by Roman Dodin, one of the brains behind Containerlab.
+
+<div class="iframe-audio-container">
+<iframe src="https://anchor.fm/modulate-demodulate/embed/episodes/Containerlab-Declarative-Network-Labbing-with-Roman-Dodin-e129cuc/a-a5q33b1" height="102px" width="400px" frameborder="0" scrolling="no"></iframe>
+</div>
+
+Participants: [:material-twitter:][rdodin-twitter][:material-linkedin:][rdodin-linkedin] Roman Dodin
+
 [rdodin-twitter]: https://twitter.com/ntdvps
 [rdodin-linkedin]: https://linkedin.com/in/rdodin
 [karim-linkedin]: https://www.linkedin.com/in/karim-radhouani/

diff --git a/docs/lab-examples/templated01.md b/docs/lab-examples/templated01.md
@@ -54,6 +54,5 @@ The `configure.sh` script relies on [gomplate](https://docs.gomplate.ca) and [gn
 [topofile]: https://github.com/srl-labs/containerlab/tree/main/lab-examples/templated01/templated01.clab.gotmpl
 [topovarfile]: https://github.com/srl-labs/containerlab/tree/main/lab-examples/templated01/templated01.clab_vars.yaml
 
-[^1]: Resource requirements are provisional. Consult with SR Linux Software Installation guide for additional information.
 
 <script type="text/javascript" src="https://cdn.jsdelivr.net/gh/hellt/drawio-js@main/embed2.js" async></script>
diff --git a/docs/lab-examples/templated02.md b/docs/lab-examples/templated02.md
@@ -61,6 +61,5 @@ bash configure.sh
 [topofile]: https://github.com/srl-labs/containerlab/tree/main/lab-examples/templated01/templated01.clab.gotmpl
 [topovarfile]: https://github.com/srl-labs/containerlab/tree/main/lab-examples/templated01/templated01.clab_vars.yaml
 
-[^1]: Resource requirements are provisional. Consult with SR Linux Software Installation guide for additional information.
 
 <script type="text/javascript" src="https://cdn.jsdelivr.net/gh/hellt/drawio-js@main/embed2.js" async></script>
diff --git a/docs/rn/0.20.md b/docs/rn/0.20.md
@@ -0,0 +1,33 @@
+# Release 0.20
+:material-calendar: 2021-11-17
+
+## Templated topologies
+In [#658](https://github.com/srl-labs/containerlab/pull/658) @karimra added support for templated topologies. This feature allows users to generate topology files based on the variables defined in a file. With templates, users can create a template once and then deploy different flavors of the topologies by using variables files, which are naturally smaller and way more human-readable.
+
+Check the [lab examples](../manual/topo-def-file.md#generated-topologies) for addition details.
+
+## Limiting CPU and Memory resources for nodes
+In [#679](https://github.com/srl-labs/containerlab/pull/679) @karimra adds resource limitation capabilities for the nodes. It is possible to limit the amount of available [CPU](../manual/nodes.md#cpu), [Memory](../manual/nodes.md#memory) and [allocate specific cores](../manual/nodes.md#cpu-set) to the nodes.
+
+## Containerlab in the media
+Containerlab has recently been vocal in the network engineering community by participating in various podcasts and conferences. Don't worry if you missed some, now we have every notable material aggregated [In The Media](../community.md#in-the-media) section.
+
+For example, here is our [NANOG83 talk](../community.md):
+
+<div class="iframe-container">
+<iframe width="100%" src="https://www.youtube.com/embed/qigCla1qY3k" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+</div>
+
+## Miscellaneous
+
+* Ignite runtime support for containerized clab execution ([#670](https://github.com/srl-labs/containerlab/pull/670))
+* Containerlab' config engine will not error on the nodes for which credentials were not found ([#675](https://github.com/srl-labs/containerlab/pull/675))
+* SONiC boot will not block in case of failures ([#678](https://github.com/srl-labs/containerlab/pull/678))
+
+## Patches
+
+### 0.20.1
+* Fix panic when copy files ([#684](https://github.com/srl-labs/containerlab/pull/684))
+
+## New contributors
+Welcome [@LimeHat](https://github.com/LimeHat), and thank you for your contributions to containerlab!
diff --git a/docs/stylesheets/extra.css b/docs/stylesheets/extra.css
@@ -43,4 +43,32 @@
   left: 0;
   width: 100%;
   height: 100%;
+}
+/* this is for anchor.fm iframes */
+.iframe-audio-container {
+  position: relative;
+  width: 100%;
+  padding-bottom: 7rem;
+  height: 0;
+}
+.iframe-audio-container iframe {
+  position: absolute;
+  top:0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+}
+/* this is for low-height iframe audio containers */
+.iframe-audio2-container {
+  position: relative;
+  width: 100%;
+  padding-bottom: 2rem;
+  height: 0;
+}
+.iframe-audio2-container iframe {
+  position: absolute;
+  top:0;
+  left: 0;
+  width: 100%;
+  height: 100%;
 }
diff --git a/go.mod b/go.mod
@@ -5,7 +5,7 @@ go 1.17
 require (
 	github.com/awalterschulze/gographviz v2.0.1+incompatible
 	github.com/cloudflare/cfssl v1.4.1
-	github.com/containerd/containerd v1.5.7
+	github.com/containerd/containerd v1.5.8
 	github.com/containernetworking/cni v0.8.1
 	github.com/containernetworking/plugins v0.9.1
 	github.com/digitalocean/go-openvswitch v0.0.0-20201214180534-ce0f183468d8
@@ -41,7 +41,7 @@ require (
 	cloud.google.com/go/storage v1.16.1 // indirect
 	github.com/Masterminds/goutils v1.1.1 // indirect
 	github.com/Microsoft/go-winio v0.5.0 // indirect
-	github.com/Microsoft/hcsshim v0.8.21 // indirect
+	github.com/Microsoft/hcsshim v0.8.23 // indirect
 	github.com/ProtonMail/go-crypto v0.0.0-20210920160938-87db9fbc61c7 // indirect
 	github.com/Shopify/ejson v1.3.0 // indirect
 	github.com/acomagu/bufpipe v1.0.3 // indirect
@@ -65,7 +65,7 @@ require (
 	github.com/containerd/fifo v1.0.0 // indirect
 	github.com/containerd/go-cni v1.0.2 // indirect
 	github.com/containerd/go-runc v1.0.0 // indirect
-	github.com/containerd/ttrpc v1.0.2 // indirect
+	github.com/containerd/ttrpc v1.1.0 // indirect
 	github.com/containerd/typeurl v1.0.2 // indirect
 	github.com/containers/image v3.0.2+incompatible // indirect
 	github.com/coreos/go-iptables v0.5.0 // indirect
@@ -133,7 +133,7 @@ require (
 	github.com/modern-go/reflect2 v1.0.1 // indirect
 	github.com/nightlyone/lockfile v1.0.0 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
-	github.com/opencontainers/image-spec v1.0.1 // indirect
+	github.com/opencontainers/image-spec v1.0.2 // indirect
 	github.com/opencontainers/runc v1.0.2 // indirect
 	github.com/opencontainers/selinux v1.8.2 // indirect
 	github.com/otiai10/copy v1.1.1 // indirect

diff --git a/go.sum b/go.sum
@@ -143,8 +143,8 @@ github.com/Microsoft/hcsshim v0.8.9/go.mod h1:5692vkUqntj1idxauYlpoINNKeqCiG6Sg3
 github.com/Microsoft/hcsshim v0.8.14/go.mod h1:NtVKoYxQuTLx6gEq0L96c9Ju4JbRJ4nY2ow3VK6a9Lg=
 github.com/Microsoft/hcsshim v0.8.15/go.mod h1:x38A4YbHbdxJtc0sF6oIz+RG0npwSCAvn69iY6URG00=
 github.com/Microsoft/hcsshim v0.8.16/go.mod h1:o5/SZqmR7x9JNKsW3pu+nqHm0MF8vbA+VxGOoXdC600=
-github.com/Microsoft/hcsshim v0.8.21 h1:btRfUDThBE5IKcvI8O8jOiIkujUsAMBSRsYDYmEi6oM=
-github.com/Microsoft/hcsshim v0.8.21/go.mod h1:+w2gRZ5ReXQhFOrvSQeNfhrYB/dg3oDwTOcER2fw4I4=
+github.com/Microsoft/hcsshim v0.8.23 h1:47MSwtKGXet80aIn+7h4YI6fwPmwIghAnsx2aOUrG2M=
+github.com/Microsoft/hcsshim v0.8.23/go.mod h1:4zegtUJth7lAvFyc6cH2gGQ5B3OFQim01nnU2M8jKDg=
 github.com/Microsoft/hcsshim/test v0.0.0-20201218223536-d3e5debf77da/go.mod h1:5hlzMzRKMLyo42nCZ9oml8AdTlq/0cvIaBv6tK1RehU=
 github.com/Microsoft/hcsshim/test v0.0.0-20210227013316-43a75bb4edd3/go.mod h1:mw7qgWloBUl75W/gVH3cQszUg1+gUITj7D6NY7ywVnY=
 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
@@ -261,6 +261,7 @@ github.com/carlmontanari/difflibgo v0.0.0-20210718170140-424f52054f94/go.mod h1:
 github.com/cenkalti/backoff/v3 v3.0.0/go.mod h1:cIeZDE3IrqwwJl6VUwCN6trj1oXrTS4rc0ij+ULvLYs=
 github.com/cenkalti/backoff/v3 v3.2.2 h1:cfUAAO3yvKMYKPrvhDuHSwQnhZNk/RMHKdZqKTxfm6M=
 github.com/cenkalti/backoff/v3 v3.2.2/go.mod h1:cIeZDE3IrqwwJl6VUwCN6trj1oXrTS4rc0ij+ULvLYs=
+github.com/cenkalti/backoff/v4 v4.1.1/go.mod h1:scbssz8iZGpm3xbr14ovlUdkxfGXNInqkPWOWmG2CLw=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/census-instrumentation/opencensus-proto v0.3.0/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/certifi/gocertifi v0.0.0-20180118203423-deb3ae2ef261/go.mod h1:GJKEexRPVJrBSOjoqN5VNOIKJ5Q3RViH6eu3puDRwx4=
@@ -321,13 +322,13 @@ github.com/containerd/containerd v1.3.4/go.mod h1:bC6axHOhabU15QhwfG7w5PipXdVtMX
 github.com/containerd/containerd v1.4.0-beta.2.0.20200729163537-40b22ef07410/go.mod h1:bC6axHOhabU15QhwfG7w5PipXdVtMXFTttgp+kVtyUA=
 github.com/containerd/containerd v1.4.1/go.mod h1:bC6axHOhabU15QhwfG7w5PipXdVtMXFTttgp+kVtyUA=
 github.com/containerd/containerd v1.4.3/go.mod h1:bC6axHOhabU15QhwfG7w5PipXdVtMXFTttgp+kVtyUA=
+github.com/containerd/containerd v1.4.9/go.mod h1:bC6axHOhabU15QhwfG7w5PipXdVtMXFTttgp+kVtyUA=
 github.com/containerd/containerd v1.5.0-beta.1/go.mod h1:5HfvG1V2FsKesEGQ17k5/T7V960Tmcumvqn8Mc+pCYQ=
 github.com/containerd/containerd v1.5.0-beta.3/go.mod h1:/wr9AVtEM7x9c+n0+stptlo/uBBoBORwEx6ardVcmKU=
 github.com/containerd/containerd v1.5.0-beta.4/go.mod h1:GmdgZd2zA2GYIBZ0w09ZvgqEq8EfBp/m3lcVZIvPHhI=
 github.com/containerd/containerd v1.5.0-rc.0/go.mod h1:V/IXoMqNGgBlabz3tHD2TWDoTJseu1FGOKuoA4nNb2s=
-github.com/containerd/containerd v1.5.1/go.mod h1:0DOxVqwDy2iZvrZp2JUx/E+hS0UNTVn7dJnIOwtYR4g=
-github.com/containerd/containerd v1.5.7 h1:rQyoYtj4KddB3bxG6SAqd4+08gePNyJjRqvOIfV3rkM=
-github.com/containerd/containerd v1.5.7/go.mod h1:gyvv6+ugqY25TiXxcZC3L5yOeYgEw0QMhscqVp1AR9c=
+github.com/containerd/containerd v1.5.8 h1:NmkCC1/QxyZFBny8JogwLpOy2f+VEbO/f6bV2Mqtwuw=
+github.com/containerd/containerd v1.5.8/go.mod h1:YdFSv5bTFLpG2HIYmfqDpSYYTDX+mc5qtSuYx1YUb/s=
 github.com/containerd/continuity v0.0.0-20190426062206-aaeac12a7ffc/go.mod h1:GL3xCUCBDV3CZiTSEKksMWbLE66hEyuu9qyDOOqM47Y=
 github.com/containerd/continuity v0.0.0-20190815185530-f2a389ac0a02/go.mod h1:GL3xCUCBDV3CZiTSEKksMWbLE66hEyuu9qyDOOqM47Y=
 github.com/containerd/continuity v0.0.0-20191127005431-f65d91d395eb/go.mod h1:GL3xCUCBDV3CZiTSEKksMWbLE66hEyuu9qyDOOqM47Y=
@@ -368,8 +369,9 @@ github.com/containerd/ttrpc v0.0.0-20190828154514-0e0f228740de/go.mod h1:PvCDdDG
 github.com/containerd/ttrpc v0.0.0-20190828172938-92c8520ef9f8/go.mod h1:PvCDdDGpgqzQIzDW1TphrGLssLDZp2GuS+X5DkEJB8o=
 github.com/containerd/ttrpc v0.0.0-20191028202541-4f1b8fe65a5c/go.mod h1:LPm1u0xBw8r8NOKoOdNMeVHSawSsltak+Ihv+etqsE8=
 github.com/containerd/ttrpc v1.0.1/go.mod h1:UAxOpgT9ziI0gJrmKvgcZivgxOp8iFPSk8httJEt98Y=
-github.com/containerd/ttrpc v1.0.2 h1:2/O3oTZN36q2xRolk0a2WWGgh7/Vf/liElg5hFYLX9U=
 github.com/containerd/ttrpc v1.0.2/go.mod h1:UAxOpgT9ziI0gJrmKvgcZivgxOp8iFPSk8httJEt98Y=
+github.com/containerd/ttrpc v1.1.0 h1:GbtyLRxb0gOLR0TYQWt3O6B0NvT8tMdorEHqIQo/lWI=
+github.com/containerd/ttrpc v1.1.0/go.mod h1:XX4ZTnoOId4HklF4edwc4DcqskFZuvXB1Evzy5KFQpQ=
 github.com/containerd/typeurl v0.0.0-20180627222232-a93fcdb778cd/go.mod h1:Cm3kwCdlkCfMSHURc+r6fwoGH6/F1hH3S4sg0rLFWPc=
 github.com/containerd/typeurl v0.0.0-20190911142611-5eb25027c9fd/go.mod h1:GeKYzf2pQcqv7tJ0AoCuuhtnqhva5LNU3U+OyKxxJpk=
 github.com/containerd/typeurl v1.0.1/go.mod h1:TB1hUtrpaiO88KEK56ijojHS1+NeF0izUACaJW2mdXg=
@@ -451,8 +453,9 @@ github.com/docker/distribution v2.7.1+incompatible/go.mod h1:J2gT2udsDAN96Uj4Kfc
 github.com/docker/docker v0.7.3-0.20190327010347-be7ac8be2ae0/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
 github.com/docker/docker v1.4.2-0.20200203170920-46ec8731fbce/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
 github.com/docker/docker v1.4.2-0.20200319182547-c7ad2b866182/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
-github.com/docker/docker v20.10.6+incompatible h1:oXI3Vas8TI8Eu/EjH4srKHJBVqraSzJybhxY7Om9faQ=
 github.com/docker/docker v20.10.6+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
+github.com/docker/docker v20.10.11+incompatible h1:OqzI/g/W54LczvhnccGqniFoQghHx3pklbLuhfXpqGo=
+github.com/docker/docker v20.10.11+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
 github.com/docker/docker-credential-helpers v0.6.3 h1:zI2p9+1NQYdnG6sMU26EX4aVGlqbInSQxQXLvzJ4RPQ=
 github.com/docker/docker-credential-helpers v0.6.3/go.mod h1:WRaJzqw3CTB9bk10avuGsjVBZsD05qeibJ1/TYlvc0Y=
 github.com/docker/go-connections v0.4.0 h1:El9xVISelRB7BuFusrZozjnkIM5YnzCViNKohAFqRJQ=
@@ -1209,8 +1212,9 @@ github.com/opencontainers/go-digest v1.0.0-rc1.0.20180430190053-c9281466c8b2/go.
 github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8Oi/yOhh5U=
 github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM=
 github.com/opencontainers/image-spec v1.0.0/go.mod h1:BtxoFyWECRxE4U/7sNtV5W15zMzWCbyJoFRP3s7yZA0=
-github.com/opencontainers/image-spec v1.0.1 h1:JMemWkRwHx4Zj+fVxWoMCFm/8sYGGrUVojFA6h/TRcI=
 github.com/opencontainers/image-spec v1.0.1/go.mod h1:BtxoFyWECRxE4U/7sNtV5W15zMzWCbyJoFRP3s7yZA0=
+github.com/opencontainers/image-spec v1.0.2 h1:9yCKha/T5XdGtO0q9Q9a6T5NUCsTn/DrBg0D7ufOcFM=
+github.com/opencontainers/image-spec v1.0.2/go.mod h1:BtxoFyWECRxE4U/7sNtV5W15zMzWCbyJoFRP3s7yZA0=
 github.com/opencontainers/runc v0.0.0-20190115041553-12f6a991201f/go.mod h1:qT5XzbpPznkRYVz/mWwUaVBUv2rmF59PVA73FjuZG0U=
 github.com/opencontainers/runc v0.1.1/go.mod h1:qT5XzbpPznkRYVz/mWwUaVBUv2rmF59PVA73FjuZG0U=
 github.com/opencontainers/runc v1.0.0-rc8.0.20190926000215-3e425f80a8c9/go.mod h1:qT5XzbpPznkRYVz/mWwUaVBUv2rmF59PVA73FjuZG0U=

diff --git a/mkdocs.yml b/mkdocs.yml
@@ -84,6 +84,7 @@ nav:
           - Leaf-spine topology: lab-examples/templated01.md
           - 5-stage Clos topology: lab-examples/templated02.md
   - Release notes:
+      - "0.20": rn/0.20.md
       - 0.19: rn/0.19.md
       - 0.18: rn/0.18.md
       - 0.17: rn/0.17.md

diff --git a/utils/file.go b/utils/file.go
@@ -50,14 +50,14 @@ func CopyFile(src, dst string, mode os.FileMode) (err error) {
 		if !os.IsNotExist(err) {
 			return err
 		}
-	}
-
-	if !(dfi.Mode().IsRegular()) {
-		return fmt.Errorf("file copy failed: destination file %s (%q): %w", dfi.Name(), dfi.Mode().String(), errNonRegularFile)
-	}
+	} else {
+		if !(dfi.Mode().IsRegular()) {
+			return fmt.Errorf("file copy failed: destination file %s (%q): %w", dfi.Name(), dfi.Mode().String(), errNonRegularFile)
+		}
 
-	if sfi != nil && os.SameFile(sfi, dfi) {
-		return nil
+		if sfi != nil && os.SameFile(sfi, dfi) {
+			return nil
+		}
 	}
 
 	return CopyFileContents(src, dst, mode)