Implement support for global default.yaml and override.yaml configs

go.mod

@@ -13,6 +13,7 @@ require (
 	github.com/diskfs/go-diskfs v1.2.0
 	github.com/docker/go-units v0.4.0
 	github.com/elastic/go-libaudit/v2 v2.2.0
+	github.com/google/go-cmp v0.5.5
 	github.com/gorilla/mux v1.8.0
 	github.com/hashicorp/go-multierror v1.1.1
 	github.com/lima-vm/sshocker v0.2.2
@@ -24,6 +25,7 @@ require (
 	github.com/opencontainers/go-digest v1.0.0
 	github.com/sirupsen/logrus v1.8.1
 	github.com/spf13/cobra v1.2.1
+	github.com/xorcare/pointer v1.1.0
 	github.com/yalue/native_endian v1.0.2
 	golang.org/x/sys v0.0.0-20210818153620-00dd8d7831e7
 	gopkg.in/yaml.v2 v2.4.0
@@ -36,7 +38,6 @@ require (
 	github.com/fatih/color v1.10.0 // indirect
 	github.com/fsnotify/fsnotify v1.4.9 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/google/go-cmp v0.5.5 // indirect
 	github.com/hashicorp/errwrap v1.0.0 // indirect
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
@@ -53,6 +54,7 @@ require (
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
 	golang.org/x/term v0.0.0-20210503060354-a79de5458b56 // indirect
 	golang.org/x/text v0.3.6 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c // indirect
 	google.golang.org/grpc v1.39.0-dev.0.20210518002758-2713b77e8526 // indirect
 	google.golang.org/protobuf v1.27.1 // indirect

go.sum

@@ -816,6 +816,8 @@ github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415/go.mod h1:
 github.com/xeipuuv/gojsonschema v0.0.0-20180618132009-1d523034197f/go.mod h1:5yf86TLmAcydyeJq5YvxkGPE2fm/u4myDekKRoLuqhs=
 github.com/xeipuuv/gojsonschema v1.2.0/go.mod h1:anYRn/JVcOK2ZgGU+IjEV4nwlhoK5sQluxsYJ78Id3Y=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
+github.com/xorcare/pointer v1.1.0 h1:sFwXOhRF8QZ0tyVZrtxWGIoVZNEmRzBCaFWdONPQIUM=
+github.com/xorcare/pointer v1.1.0/go.mod h1:6KLhkOh6YbuvZkT4YbxIbR/wzLBjyMxOiNzZhJTor2Y=
 github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
 github.com/yalue/native_endian v1.0.2 h1:e4SxBbaCoOOO4E3axd7FSriUhzc1bIzqZGG5jl6Evbg=
 github.com/yalue/native_endian v1.0.2/go.mod h1:cr+I2WnCwDkkPV0DvgBpGQkJV12CDWR5bAoMtT+56iE=

pkg/cidata/cidata.go

@@ -173,7 +173,7 @@ func GenerateISO9660(instDir, name string, y *limayaml.LimaYAML, udpDNSLocalPort
 		}
 	}
 
-	if guestAgentBinary, err := GuestAgentBinary(y.Arch); err != nil {
+	if guestAgentBinary, err := GuestAgentBinary(*y.Arch); err != nil {
 		return err
 	} else {
 		defer guestAgentBinary.Close()

pkg/hostagent/hostagent.go

@@ -156,10 +156,10 @@ func New(instName string, stdout io.Writer, sigintCh chan os.Signal, opts ...Opt
 }
 
 func determineSSHLocalPort(y *limayaml.LimaYAML, instName string) (int, error) {
-	if y.SSH.LocalPort > 0 {
-		return y.SSH.LocalPort, nil
+	if *y.SSH.LocalPort > 0 {
+		return *y.SSH.LocalPort, nil
 	}
-	if y.SSH.LocalPort < 0 {
+	if *y.SSH.LocalPort < 0 {
 		return 0, fmt.Errorf("invalid ssh local port %d", y.SSH.LocalPort)
 	}
 	switch instName {

pkg/limayaml/default.yaml

@@ -229,6 +229,46 @@ useHostResolver: true
 # - 1.1.1.1
 # - 1.0.0.1
 
+# ===================================================================== #
+# GLOBAL DEFAULTS AND OVERRIDES
+# ===================================================================== #
+
+# The builtin defaults can be changed globally by creating a $LIMA_HOME/_config/default.yaml
+# file. It will be used by ALL instances under the same $LIMA_HOME, and it
+# will be applied on each `limactl start`, so can affect instance restarts.
+
+# A similar mechanism is $LIMA_HOME/_config/override.yaml, which will take
+# precedence even over the settings in an instances lima.yaml file.
+# It too applies to ALL instances under the same $LIMA_HOME, and is applied
+# on each restart. It can be used to globally override settings, e.g. make
+# the mount of the home directory writable.
+
+# On each instance start the config settings are determined: If a value is
+# not set in `lima.yaml`, then the `default.yaml` is used. If that file
+# doesn't exist, or the value is not defined in the file, then the buildin
+# default is used. If `override.yaml` exists and defines the value, then
+# it overrides whatever has been choosen so far.
+
+# For slices (e.g. `mounts`, `provision`) and maps (`env`) the entries are
+# combined instead of replacing each other. Slices are produced from override
+# settings, followed by lima.yaml, followed by defaults.yaml (but NOT from
+# builtin defaults). Maps are produced starting with defaults.yaml values,
+# overwriting with lima.yaml ones, overwriting with override.yaml.
+
+# Exceptions:
+# - `dns` will use the list from the highest priority file; they are not
+#   combined. If override.yaml defines a list of `dns` entries, then the
+#   settings in default.yaml and lima.yaml are ignored.
+#
+# - `mounts` will update the `writable` setting when 2 entries have the
+#   same `location` value. For this reason they are processed in the opposite
+#   order: starting with default, followed by lima, and then override.
+#
+# -`networks` will replace lower priority entries with the same `interface`
+#   name with higher priority definitions. This does not apply if the
+#  `interface` field is empty. `networks` are therefore also processed
+#  in lowest to highest priority order.
+
 # ===================================================================== #
 # END OF TEMPLATE
 # ===================================================================== #