[Fix] --save: avoid a conflict with set -e

.github/workflows/nvm-install-test.yml

@@ -0,0 +1,98 @@
+name: 'Tests: nvm install with set -e'
+
+on:
+  pull_request:
+  push:
+  workflow_dispatch:
+    inputs:
+      ref:
+        description: 'git ref to use'
+        required: false
+        default: 'HEAD'
+
+jobs:
+  matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.matrix.outputs.matrix }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - id: matrix
+        run: |
+          if [ "${{ github.event_name }}" == "workflow_dispatch" ] && [ -n "${{ github.event.inputs.ref }}" ]; then
+            echo "matrix=\"[\"${{ github.event.inputs.ref }}\"]\"" >> $GITHUB_OUTPUT
+          else
+            TAGS="$((echo "HEAD" && git tag --sort=-v:refname --merged HEAD --format='%(refname:strip=2) %(creatordate:short)' | grep '^v' | while read tag date; do
+              if [ "$(uname)" == "Darwin" ]; then
+                timestamp=$(date -j -f "%Y-%m-%d" "$date" +%s)
+                threshold=$(date -j -v-4y +%s)
+              else
+                timestamp=$(date -d "$date" +%s)
+                threshold=$(date -d "4 years ago" +%s)
+              fi
+              if [ $timestamp -ge $threshold ]; then echo "$tag"; fi
+            done) | xargs)"
+            echo $TAGS
+            TAGS_JSON=$(printf "%s\n" $TAGS | jq -R . | jq -sc .)
+            echo "matrix=${TAGS_JSON}" >> $GITHUB_OUTPUT
+          fi
+
+  test:
+    needs: [matrix]
+    runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.ref == 'v0.40.0' }} # https://github.com/nvm-sh/nvm/issues/3405
+    strategy:
+      fail-fast: false
+      matrix:
+        ref: ${{ fromJson(needs.matrix.outputs.matrix) }}
+        has-nvmrc:
+           - 'no nvmrc'
+           - 'nvmrc'
+        shell-level:
+           - 1 shlvl
+           - 2 shlvls
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: resolve HEAD to sha
+        run: |
+          if [ '${{ matrix.ref }}' = 'HEAD' ]; then
+            REF="$(git rev-parse HEAD)"
+          else
+            REF="${{ matrix.ref }}"
+          fi
+          echo "resolved ref: ${REF}"
+          echo "ref="$REF"" >> $GITHUB_ENV
+      - run: echo $- # which options are set
+      - run: echo node > .nvmrc
+        if: ${{ matrix.has-nvmrc == 'nvmrc' }}
+      - run:  curl -I --compressed -v https://nodejs.org/dist/
+      - name: 'install nvm'
+        run: |
+          set -e
+          curl -o- "https://raw.githubusercontent.com/nvm-sh/nvm/${ref}/install.sh" | bash
+      - name: nvm install in 1 shell level, ${{ matrix.has-nvmrc }}
+        if: ${{ matrix.shell-level == '1 shlvl' }}
+        run: |
+          set -e && source ~/.nvm/nvm.sh
+          echo nvm.sh sourced
+          nvm --version
+          if [ '${{ matrix.has-nvmrc }}' == 'nvmrc' ]; then
+            nvm install
+          fi
+      - name: nvm install in 2 shell levels, ${{ matrix.has-nvmrc }}
+        if: ${{ matrix.shell-level == '2 shlvls' }}
+        run: |
+          if [ '${{ matrix.has-nvmrc }}' == 'nvmrc' ]; then
+            bash -c "set -e && source ~/.nvm/nvm.sh && echo nvm.sh sourced && nvm --version && nvm install"
+          else
+            bash -c "set -e && source ~/.nvm/nvm.sh && echo nvm.sh sourced && nvm --version"
+          fi
+
+  finisher:
+    runs-on: ubuntu-latest
+    needs: [test]
+    steps:
+      - run: true

nvm.sh

@@ -3360,6 +3360,10 @@ nvm() {
             shift
           ;;
           --save | -w)
+            if [ $NVM_WRITE_TO_NVMRC -eq 1 ]; then
+              nvm_err '--save and -w may only be provided once'
+              return 6
+            fi
             NVM_WRITE_TO_NVMRC=1
             shift
           ;;
@@ -3511,6 +3515,11 @@ nvm() {
           nvm_ensure_default_set "${provided_version}"
         fi
 
+        if [ $NVM_WRITE_TO_NVMRC -eq 1 ]; then
+          nvm_write_nvmrc "${VERSION}"
+          EXIT_CODE=$?
+        fi
+
         if [ $EXIT_CODE -ne 0 ] && [ -n "${ALIAS-}" ]; then
           nvm alias "${ALIAS}" "${provided_version}"
           EXIT_CODE=$?
@@ -3746,6 +3755,8 @@ nvm() {
       local NVM_LTS
       local IS_VERSION_FROM_NVMRC
       IS_VERSION_FROM_NVMRC=0
+      local NVM_WRITE_TO_NVMRC
+      NVM_WRITE_TO_NVMRC=0
 
       while [ $# -ne 0 ]; do
         case "$1" in
@@ -3757,7 +3768,13 @@ nvm() {
           --) ;;
           --lts) NVM_LTS='*' ;;
           --lts=*) NVM_LTS="${1##--lts=}" ;;
-          --save | -w) NVM_WRITE_TO_NVMRC=1 ;;
+          --save | -w)
+            if [ $NVM_WRITE_TO_NVMRC -eq 1 ]; then
+              nvm_err '--save and -w may only be provided once'
+              return 6
+            fi
+            NVM_WRITE_TO_NVMRC=1
+          ;;
           --*) ;;
           *)
             if [ -n "${1-}" ]; then
@@ -3791,8 +3808,8 @@ nvm() {
         return 127
       fi
 
-      if [ "${NVM_WRITE_TO_NVMRC:-0}" -eq 1 ]; then
+      if [ $NVM_WRITE_TO_NVMRC -eq 1 ]; then
-        nvm_write_nvmrc "$VERSION"
+        nvm_write_nvmrc "${VERSION}"
       fi
 
       if [ "_${VERSION}" = '_system' ]; then
@@ -4539,31 +4556,41 @@ nvm_supports_xz() {
 nvm_auto() {
   local NVM_MODE
   NVM_MODE="${1-}"
-  local VERSION
+
-  local NVM_CURRENT
+  case "${NVM_MODE}" in
-  if [ "_${NVM_MODE}" = '_install' ]; then
+    none) return 0 ;;
-    VERSION="$(nvm_alias default 2>/dev/null || nvm_echo)"
+    use | install)
-    if [ -n "${VERSION}" ] && ! [ "_${VERSION}" = '_N/A' ] && nvm_is_valid_version "${VERSION}"; then
+      local VERSION
-      nvm install "${VERSION}" >/dev/null
+      local NVM_CURRENT
-    elif nvm_rc_version >/dev/null 2>&1; then
+      NVM_CURRENT="$(nvm_ls_current)"
-      nvm install >/dev/null
+      if [ "_${NVM_CURRENT}" = '_none' ] || [ "_${NVM_CURRENT}" = '_system' ]; then
-    fi
+        VERSION="$(nvm_resolve_local_alias default 2>/dev/null || nvm_echo)"
-  elif [ "_$NVM_MODE" = '_use' ]; then
+        if [ -n "${VERSION}" ]; then
-    NVM_CURRENT="$(nvm_ls_current)"
+          if [ "_${VERSION}" != '_N/A' ] && nvm_is_valid_version "${VERSION}"; then
-    if [ "_${NVM_CURRENT}" = '_none' ] || [ "_${NVM_CURRENT}" = '_system' ]; then
+            if [ "_${NVM_MODE}" = '_install' ]; then
-      VERSION="$(nvm_resolve_local_alias default 2>/dev/null || nvm_echo)"
+              nvm install "${VERSION}" >/dev/null
-      if [ -n "${VERSION}" ] && ! [ "_${VERSION}" = '_N/A' ] && nvm_is_valid_version "${VERSION}"; then
+            else
-        nvm use --silent "${VERSION}" >/dev/null
+              nvm use --silent "${VERSION}" >/dev/null
-      elif nvm_rc_version >/dev/null 2>&1; then
+            fi
-        nvm use --silent >/dev/null
+          else
+            return 0
+          fi
+        elif nvm_rc_version >/dev/null 2>&1; then
+          if [ "_${NVM_MODE}" = '_install' ]; then
+            nvm install >/dev/null
+          else
+            nvm use --silent >/dev/null
+          fi
+        fi
+      else
+        nvm use --silent "${NVM_CURRENT}" >/dev/null
       fi
-    else
+    ;;
-      nvm use --silent "${NVM_CURRENT}" >/dev/null
+    *)
-    fi
+      nvm_err 'Invalid auto mode supplied.'
-  elif [ "_${NVM_MODE}" != '_none' ]; then
+      return 1
-    nvm_err 'Invalid auto mode supplied.'
+    ;;
-    return 1
+  esac
-  fi
 }
 
 nvm_process_parameters() {