remove `Nim-csources-v1` and `nimble` checkouts (#75)

When `build_nim.sh` detects that `skipIntegrityCheck` is supported,
it runs the upstream toolchain for building Nim, ignoring the locally
checked out `Nim-csources-v1` and `nimble` sub-repositories. So, having
those repos checked out is not useful in that scenario.

When `skipIntegrityCheck` is unsupported, `build_nim.sh` uses the local
sub-repositories if they are available. But, it also clones them if they
are unavailable using commits as specified by environment variables.
Because the clone will happen as part of the script, having the repos
linked as sub-repositories is also not useful. Even worse, if the script
has different commit hashes than the subrepository, the behaviour is
different depending on whether `build_nim.sh` is run before or after
the submodules are checked out.

Therefore, we can remove the `Nim-csources-v1` and `nimble` sub-repos,
using the upstream build system if available, or the hardcoded commits
inside `build_nim.sh` to have a manual build, as before.

Also moves the various variables that control the used versions into
the manual section to emphasize that these only take effect in manual
mode, but not when using upstream build system (`skipIntegrityCheck`).

If one wants to use a custom `Nimble` version, fork `Nim` and adjust the
config in that fork. That also works with the upstream build system.

.gitmodules

@@ -3,13 +3,3 @@
 	url = https://github.com/status-im/Nim.git
 	ignore = dirty
 	branch = nimbus
-[submodule "vendor/nimble"]
-	path = vendor/nimble
-	url = https://github.com/nim-lang/nimble.git
-	ignore = dirty
-	branch = master
-[submodule "vendor/Nim-csources-v1"]
-	path = vendor/Nim-csources-v1
-	url = https://github.com/nim-lang/csources_v1.git
-	ignore = untracked
-	branch = master

makefiles/targets.mk

@@ -85,7 +85,7 @@ build-nim: | sanity-checks
 		MAKE="$(MAKE)" \
 		ARCH_OVERRIDE=$(ARCH_OVERRIDE) \
 		QUICK_AND_DIRTY_COMPILER=$(QUICK_AND_DIRTY_COMPILER) \
-		"$(CURDIR)/$(BUILD_SYSTEM_DIR)/scripts/build_nim.sh" "$(NIM_DIR)" ../Nim-csources-v1 ../nimble "$(CI_CACHE)"
+		"$(CURDIR)/$(BUILD_SYSTEM_DIR)/scripts/build_nim.sh" "$(NIM_DIR)" ../Nim-csources ../nimble "$(CI_CACHE)"
 
 # Check if the update might cause loss of work. Abort, if so, while allowing an override mechanism.
 update-test:

scripts/build_nim.sh

@@ -10,23 +10,14 @@
 
 set -e
 
-# Git commits
-: ${CSOURCES_V1_COMMIT:=561b417c65791cd8356b5f73620914ceff845d10}
-: ${CSOURCES_V2_COMMIT:=86742fb02c6606ab01a532a0085784effb2e753e}
-: ${CSOURCES_V1_REPO:=https://github.com/nim-lang/csources_v1.git}
-: ${CSOURCES_V2_REPO:=https://github.com/nim-lang/csources_v2.git}
-
-# After this Nim commit, use csources v2
-: ${CSOURCES_V2_START_COMMIT:=f7c203fb6c89b5cef83c4f326aeb23ef8c4a2c40}
-: ${NIMBLE_COMMIT:=d13f3b8ce288b4dc8c34c219a4e050aaeaf43fc9} # 0.13.1
 # NIM_COMMIT could be a (partial) commit hash, a tag, a branch name, etc. Empty by default.
 NIM_COMMIT_HASH="" # full hash for NIM_COMMIT, retrieved in "nim_needs_rebuilding()"
 
 # script arguments
 [[ $# -ne 4 ]] && { echo "Usage: $0 nim_dir csources_dir nimble_dir ci_cache_dir"; exit 1; }
 NIM_DIR="$1"
-CSOURCES_DIR="$2" # can be relative to NIM_DIR
-NIMBLE_DIR="$3" # can be relative to NIM_DIR
+CSOURCES_DIR="$2" # can be relative to NIM_DIR; only used when `skipIntegrityCheck` unsupported
+NIMBLE_DIR="$3" # can be relative to NIM_DIR; only used when `skipIntegrityCheck` unsupported
 CI_CACHE="$4"
 
 ## env vars
@@ -128,7 +119,11 @@ build_nim() {
 	pushd "$NIM_DIR"
 
 	if grep -q skipIntegrityCheck koch.nim; then
-		# Run Nim buildchain
+		# Run Nim buildchain, with matching dependency versions
+		# - CSOURCES_REPO from Nim/config/build_config.txt (nim_csourcesUrl)
+		# - CSOURCES_COMMIT from Nim/config/build_config.txt (nim_csourcesHash)
+		# - NIMBLE_REPO from Nim/koch.nim (bundleNimbleExe)
+		# - NIMBLE_COMMIT from Nim/koch.nim (NimbleStableCommit)
 		. ci/funs.sh
 		NIMCORES=1 nimBuildCsourcesIfNeeded $UCPU
 		bin/nim c --noNimblePath --skipUserCfg --skipParentCfg --warnings:off --hints:off koch
@@ -141,6 +136,17 @@ build_nim() {
 			./koch nimble -d:release --skipUserCfg --skipParentCfg --warnings:off --hints:off
 		fi
 	else
+		# Git commits
+		: ${CSOURCES_V1_COMMIT:=561b417c65791cd8356b5f73620914ceff845d10}
+		: ${CSOURCES_V2_COMMIT:=86742fb02c6606ab01a532a0085784effb2e753e}
+		: ${CSOURCES_V1_REPO:=https://github.com/nim-lang/csources_v1.git}
+		: ${CSOURCES_V2_REPO:=https://github.com/nim-lang/csources_v2.git}
+
+		# After this Nim commit, use csources v2
+		: ${CSOURCES_V2_START_COMMIT:=f7c203fb6c89b5cef83c4f326aeb23ef8c4a2c40}
+		: ${NIMBLE_REPO:=https://github.com/nim-lang/nimble.git}
+		: ${NIMBLE_COMMIT:=d13f3b8ce288b4dc8c34c219a4e050aaeaf43fc9} # 0.13.1
+
 		# Custom buildchain for older versions
 		# TODO Remove this once the default NIM_COMMIT supports `--skipIntegrityCheck`
 		# We will still be able to compile older versions by removing the flag,
@@ -170,7 +176,7 @@ build_nim() {
 		if [[ ! -d "$NIMBLE_DIR" ]]; then
 			mkdir -p "$NIMBLE_DIR"
 			pushd "$NIMBLE_DIR"
-			git clone https://github.com/nim-lang/nimble.git .
+			git clone $NIMBLE_REPO .
 			git checkout $NIMBLE_COMMIT
 			# we have to delete .git or koch.nim will checkout a branch tip, overriding our target commit
 			rm -rf .git

vendor/Nim-csources-v1

@@ -1 +0,0 @@
-Subproject commit 561b417c65791cd8356b5f73620914ceff845d10

vendor/nimble

@@ -1 +0,0 @@
-Subproject commit d13f3b8ce288b4dc8c34c219a4e050aaeaf43fc9