misc: port github.com/grafana/river into syntax

This commit brings the github.com/grafana/river code into the syntax
package, which is intended to be a submodule.

There are a few reasons to do this:

1. "River" is being sunset as a term in favor of the "Alloy
   configuration syntax," so it no longer makes sense for River to exist
   on its own.

2. With the transition to Alloy configuration syntax, error messages and
   alike should remove references to the word "River."

3. It is likely that the Alloy configuration syntax will be receiving a
   stream of updates soon after the 1.0 release, where having it in a
   separate repo would slow us down and risks desyncing documentation.

4. There are projects which depend on River, so it must be importable if
   we bring it into Alloy. However, since we don't want to mark the Go
   API as 1.0 yet, constraining the Alloy configuration syntax to a
   submodule allows us to version it separately.

go.mod

@@ -29,14 +29,13 @@ require (
 	github.com/docker/go-connections v0.4.0
 	github.com/drone/envsubst/v2 v2.0.0-20210730161058-179042472c46
 	github.com/fatih/color v1.15.0
-	github.com/fatih/structs v1.1.0
 	github.com/fortytw2/leaktest v1.3.0
 	github.com/fsnotify/fsnotify v1.6.0
 	github.com/github/smimesign v0.2.0
 	github.com/go-git/go-git/v5 v5.11.0
 	github.com/go-kit/log v0.2.1
 	github.com/go-logfmt/logfmt v0.6.0
-	github.com/go-logr/logr v1.4.1
+	github.com/go-logr/logr v1.4.1 // indirect
 	github.com/go-sourcemap/sourcemap v2.1.3+incompatible
 	github.com/go-sql-driver/mysql v1.7.1
 	github.com/gogo/protobuf v1.3.2
@@ -45,7 +44,6 @@ require (
 	github.com/google/cadvisor v0.47.0
 	github.com/google/dnsmasq_exporter v0.2.1-0.20230620100026-44b14480804a
 	github.com/google/go-cmp v0.6.0
-	github.com/google/go-jsonnet v0.18.0
 	github.com/google/pprof v0.0.0-20240117000934-35fc243c5815
 	github.com/google/renameio/v2 v2.0.0
 	github.com/google/uuid v1.4.0
@@ -162,7 +160,6 @@ require (
 	github.com/spf13/cobra v1.7.0
 	github.com/stretchr/testify v1.8.4
 	github.com/testcontainers/testcontainers-go v0.25.0
-	github.com/testcontainers/testcontainers-go/modules/k3s v0.0.0-20230615142642-c175df34bd1d
 	github.com/uber/jaeger-client-go v2.30.0+incompatible
 	github.com/vincent-petithory/dataurl v1.0.0
 	github.com/webdevops/azure-metrics-exporter v0.0.0-20230717202958-8701afc2b013
@@ -226,7 +223,7 @@ require (
 	gopkg.in/yaml.v3 v3.0.1
 	gotest.tools v2.2.0+incompatible
 	k8s.io/api v0.28.3
-	k8s.io/apiextensions-apiserver v0.28.0
+	k8s.io/apiextensions-apiserver v0.28.0 // indirect
 	k8s.io/client-go v0.28.3
 	k8s.io/component-base v0.28.1
 	k8s.io/klog/v2 v2.100.1
@@ -766,3 +763,9 @@ exclude (
 )
 
 replace github.com/github/smimesign => github.com/grafana/smimesign v0.2.1-0.20220408144937-2a5adf3481d3
+
+// Submodules.
+// TODO(rfratto): Change all imports of github.com/grafana/river in favor of
+// importing github.com/grafana/alloy/syntax and change module and package
+// names to remove references of "river".
+replace github.com/grafana/river => ./syntax

go.sum

@@ -666,12 +666,10 @@ github.com/fatih/camelcase v1.0.0 h1:hxNvNX/xYBp0ovncs8WyWZrOrpBNub/JfaMvbURyft8
 github.com/fatih/camelcase v1.0.0/go.mod h1:yN2Sb0lFhZJUdVvtELVWefmrXpuZESvPmqwoZc+/fpc=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
-github.com/fatih/color v1.10.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
 github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
 github.com/fatih/color v1.15.0 h1:kOqh6YHBtK8aywxGerMG2Eq3H6Qgoqeo13Bk2Mv/nBs=
 github.com/fatih/color v1.15.0/go.mod h1:0h5ZqXfHYED7Bhv2ZJamyIOUej9KtShiJESRwBDUSsw=
 github.com/fatih/structs v0.0.0-20180123065059-ebf56d35bba7/go.mod h1:9NiDSp5zOcgEDl+j00MP/WkGVPOlPRLejGD8Ga6PJ7M=
-github.com/fatih/structs v1.1.0 h1:Q7juDM0QtcnhCpeyLGQKyg4TOIghuNXrkL32pHAUMxo=
 github.com/fatih/structs v1.1.0/go.mod h1:9NiDSp5zOcgEDl+j00MP/WkGVPOlPRLejGD8Ga6PJ7M=
 github.com/felixge/fgprof v0.9.3 h1:VvyZxILNuCiUCSXtPtYmmtGvb65nqXh2QFWc0Wpf2/g=
 github.com/felixge/fgprof v0.9.3/go.mod h1:RdbpDgzqYVh/T9fPELJyV7EYJuHB55UTEULNun8eiPw=
@@ -957,8 +955,6 @@ github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
 github.com/google/go-github/v32 v32.1.0/go.mod h1:rIEpZD9CTDQwDK9GDrtMTycQNA4JU3qBsCizh3q2WCI=
-github.com/google/go-jsonnet v0.18.0 h1:/6pTy6g+Jh1a1I2UMoAODkqELFiVIdOxbNwv0DDzoOg=
-github.com/google/go-jsonnet v0.18.0/go.mod h1:C3fTzyVJDslXdiTqw/bTFk7vSGyCtH3MGRbDfvEwGd0=
 github.com/google/go-querystring v0.0.0-20170111101155-53e6ce116135/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/google/go-querystring v1.1.0 h1:AnCroh3fv4ZBgVIf1Iwtovgjaw/GiKJo8M8yD/fhyJ8=
@@ -1084,8 +1080,6 @@ github.com/grafana/pyroscope/ebpf v0.4.3 h1:gPfm2FKabdycRfFIej/s0awSzsbAaoSefaeh
 github.com/grafana/pyroscope/ebpf v0.4.3/go.mod h1:Iv66aj9WsDWR8bGMPQzCQPCgVgCru0KizGrbcR3YmLk=
 github.com/grafana/regexp v0.0.0-20221123153739-15dc172cd2db h1:7aN5cccjIqCLTzedH7MZzRZt5/lsAHch6Z3L2ZGn5FA=
 github.com/grafana/regexp v0.0.0-20221123153739-15dc172cd2db/go.mod h1:M5qHK+eWfAv8VR/265dIuEpL3fNfeC21tXXp9itM24A=
-github.com/grafana/river v0.3.1-0.20240123144725-960753160cd1 h1:mCOKdWkLv8n9X0ORWrPR+W/zLOAa1o6iM+Dfy0ofQUs=
-github.com/grafana/river v0.3.1-0.20240123144725-960753160cd1/go.mod h1:tAiNX2zt3HUsNyPNUDSvE6AgQ4+kqJvljBI+ACppMtM=
 github.com/grafana/smimesign v0.2.1-0.20220408144937-2a5adf3481d3 h1:UPkAxuhlAcRmJT3/qd34OMTl+ZU7BLLfOO2+NXBlJpY=
 github.com/grafana/smimesign v0.2.1-0.20220408144937-2a5adf3481d3/go.mod h1:iZiiwNT4HbtGRVqCQu7uJPEZCuEE5sfSSttcnePkDl4=
 github.com/grafana/snowflake-prometheus-exporter v0.0.0-20221213150626-862cad8e9538 h1:tkT0yha3JzB5S5VNjfY4lT0cJAe20pU8XGt3Nuq73rM=
@@ -1529,7 +1523,6 @@ github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaO
 github.com/mattn/go-colorable v0.1.1/go.mod h1:FuOcm+DKB9mbwrcAfNl7/TZVBZ6rcnceauSikq3lYCQ=
 github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
 github.com/mattn/go-colorable v0.1.6/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
-github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
 github.com/mattn/go-colorable v0.1.9/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
 github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
 github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
@@ -2074,7 +2067,6 @@ github.com/segmentio/fasthash v1.0.3 h1:EI9+KE1EwvMLBWwjpRDc+fEM+prwxDYbslddQGtr
 github.com/segmentio/fasthash v1.0.3/go.mod h1:waKX8l2N8yckOgmSsXJi7x1ZfdKZ4x7KRMzBtS3oedY=
 github.com/sercand/kuberesolver/v5 v5.1.1 h1:CYH+d67G0sGBj7q5wLK61yzqJJ8gLLC8aeprPTHb6yY=
 github.com/sercand/kuberesolver/v5 v5.1.1/go.mod h1:Fs1KbKhVRnB2aDWN12NjKCB+RgYMWZJ294T3BtmVCpQ=
-github.com/sergi/go-diff v1.1.0/go.mod h1:STckp+ISIX8hZLjrqAeVduY0gWCT9IjLuqbuNXdaHfM=
 github.com/sergi/go-diff v1.2.0 h1:XU+rvMAioB0UC3q1MFrIQy4Vo5/4VsRDQQXHsEya6xQ=
 github.com/sergi/go-diff v1.2.0/go.mod h1:STckp+ISIX8hZLjrqAeVduY0gWCT9IjLuqbuNXdaHfM=
 github.com/shirou/gopsutil v0.0.0-20181107111621-48177ef5f880/go.mod h1:5b4v6he4MtMOwMlS0TUMTu2PcXUg8+E1lC7eC3UO/RA=
@@ -2196,8 +2188,6 @@ github.com/tencentcloud/tencentcloud-sdk-go v1.0.162/go.mod h1:asUz5BPXxgoPGaRgZ
 github.com/tent/http-link-go v0.0.0-20130702225549-ac974c61c2f9/go.mod h1:RHkNRtSLfOK7qBTHaeSX1D6BNpI3qw7NTxsmNr4RvN8=
 github.com/testcontainers/testcontainers-go v0.25.0 h1:erH6cQjsaJrH+rJDU9qIf89KFdhK0Bft0aEZHlYC3Vs=
 github.com/testcontainers/testcontainers-go v0.25.0/go.mod h1:4sC9SiJyzD1XFi59q8umTQYWxnkweEc5OjVtTUlJzqQ=
-github.com/testcontainers/testcontainers-go/modules/k3s v0.0.0-20230615142642-c175df34bd1d h1:KyYCHo9iBoQYw5AzcozD/77uNbFlRjTmMTA7QjSxHOQ=
-github.com/testcontainers/testcontainers-go/modules/k3s v0.0.0-20230615142642-c175df34bd1d/go.mod h1:Pa91ahCbzRB6d9FBi6UAjurTEm7WmyBVeuklLkwAKKs=
 github.com/tg123/go-htpasswd v1.2.1 h1:i4wfsX1KvvkyoMiHZzjS0VzbAPWfxzI8INcZAKtutoU=
 github.com/tg123/go-htpasswd v1.2.1/go.mod h1:erHp1B86KXdwQf1X5ZrLb7erXZnWueEQezb2dql4q58=
 github.com/tidwall/gjson v1.6.0/go.mod h1:P256ACg0Mn+j1RXIDXoss50DeIABTYK1PULOJHhxOls=

internal/cmd/integration-tests/configs/otel-metrics-gen/Dockerfile

@@ -1,6 +1,7 @@
 FROM golang:1.21 as build
 WORKDIR /app/
 COPY go.mod go.sum ./
+COPY syntax/go.mod syntax/go.sum ./syntax/
 RUN go mod download
 COPY ./internal/cmd/integration-tests/configs/otel-metrics-gen/ ./
 RUN CGO_ENABLED=0 go build -o main main.go

internal/cmd/integration-tests/configs/prom-gen/Dockerfile

@@ -1,6 +1,7 @@
 FROM golang:1.21 as build
 WORKDIR /app/
 COPY go.mod go.sum ./
+COPY syntax/go.mod syntax/go.sum ./syntax/
 RUN go mod download
 COPY ./internal/cmd/integration-tests/configs/prom-gen/ ./
 RUN CGO_ENABLED=0 go build -o main main.go