name: 'Kernel Fixes'
description: 'Applies compatibility fixes based on android/kernel/sublevel'
inputs:
  version:
    required: true
    type: string
  android_version:
    required: true
    type: string
  kernel_version:
    required: true
    type: string
  sublevel:
    required: true
    type: string
  os_patch_level:
    required: true
    type: string

runs:
  using: composite
  steps:
    - name: 'Apply Makefile and parse-options.c fixes for GLIBC >= 2.38'
      working-directory: ${{ github.workspace }}/kernel/common
      shell: bash
      run: |
        set -euo pipefail
        GLIBC_VERSION="$(ldd --version 2>/dev/null | head -n 1 | awk '{print $NF}')"
        echo "[INFO] Detected GLIBC version: $GLIBC_VERSION"
        if [ "$(printf '%s\n' "2.38" "$GLIBC_VERSION" | sort -V | head -n 1)" = "2.38" ]; then
          echo "[INFO] GLIBC >= 2.38, attempting Makefile fix."
          # Check if the pattern that needs fixing actually exists
          if grep -q '\$(Q)\$(MAKE) -C \$(SUBCMD_SRC) OUTPUT=\$(abspath \$(dir \$@))\/ \$(abspath \$@)' tools/bpf/resolve_btfids/Makefile; then
            echo "[INFO] Found pattern to fix, applying sed."
            sed -i '/\$(Q)\$(MAKE) -C \$(SUBCMD_SRC) OUTPUT=\$(abspath \$(dir \$@))\/ \$(abspath \$@)/s//$(Q)$(MAKE) -C $(SUBCMD_SRC) EXTRA_CFLAGS="$(CFLAGS)" OUTPUT=$(abspath $(dir $@))\/ $(abspath $@)/' tools/bpf/resolve_btfids/Makefile
            MAKEFILE_FIXED="true"
          elif grep -q 'EXTRA_CFLAGS' tools/bpf/resolve_btfids/Makefile; then
            echo "[INFO] EXTRA_CFLAGS already present, no fix needed."
            MAKEFILE_FIXED="already_fixed"
          else
            echo "[WARN] Neither pattern found in Makefile."
            MAKEFILE_FIXED="false"
          fi
          echo "MAKEFILE_FIXED=$MAKEFILE_FIXED" >> $GITHUB_ENV
           if [[ "${{ inputs.version }}" == "android13-5.10" && "${{ inputs.sublevel }}" -le 186 ]] || \
             [[ "${{ inputs.version }}" == "android13-5.15" && "${{ inputs.sublevel }}" -le 119 ]] || \
             [[ "${{ inputs.version }}" == "android14-5.15" && "${{ inputs.sublevel }}" -le 110 ]]; then
            echo "[INFO] Applying parse-options.c fixes."
            sed -i '/char \*buf = NULL;/a int i;' tools/lib/subcmd/parse-options.c 2>/dev/null || true
            sed -i 's/for (int i = 0; subcommands\[i\]; i++) {/for (i = 0; subcommands[i]; i++) {/' tools/lib/subcmd/parse-options.c 2>/dev/null || true
            sed -i '/if (subcommands) {/a int i;' tools/lib/subcmd/parse-options.c 2>/dev/null || true
            sed -i 's/for (int i = 0; subcommands\[i\]; i++)/for (i = 0; subcommands[i]; i++)/' tools/lib/subcmd/parse-options.c 2>/dev/null || true
            echo "PARSE_OPTIONS_FIXED=true" >> $GITHUB_ENV
          else
            echo "PARSE_OPTIONS_FIXED=false" >> $GITHUB_ENV
          fi
        else
          echo "[SKIP] GLIBC version < 2.38, skipping Makefile fix."
        fi

    - name: 'Apply mmap.c fix for specific versions'
      shell: bash
      if: ${{ inputs.version == 'android15-6.6' && inputs.sublevel <= '58' }}
      working-directory: ${{ github.workspace }}/kernel/common
      run: |
        echo "[INFO] Checking for android15 + kernel 6.6 include fix..."
        if [[ "${{ inputs.android_version }}" == "android15" && "${{ inputs.kernel_version }}" == "6.6" ]]; then
          echo "[MATCH] android15 + 6.6, checking for fs.h include."
          cd "${{ github.workspace }}/kernel/common"
          if ! grep -qxF '#include <trace/hooks/fs.h>' ./fs/namespace.c; then
            echo "[INFO] Adding missing #include <trace/hooks/fs.h> to fs/namespace.c."
            sed -i '/#include <trace\/hooks\/blk.h>/a #include <trace\/hooks\/fs.h>' ./fs/namespace.c
            echo "MMAP_NAMESPACE_FIX=true" >> "$GITHUB_ENV"
          else
            echo "[INFO] #include <trace/hooks/fs.h> already present."
            echo "MMAP_NAMESPACE_FIX=already_present" >> "$GITHUB_ENV"
          fi
        fi

    - name: 'Apply mmap.c fix for specific versions'
      shell: bash
      if: ${{ (inputs.version == 'android12-5.10' && inputs.sublevel == 226) || (inputs.version == 'android13-5.10' && inputs.sublevel == 223) || (inputs.version == 'android13-5.15' && inputs.sublevel == 167) || (inputs.version == 'android14-5.15' && inputs.sublevel == 167) }}
      working-directory: ${{ github.workspace }}/kernel/common
      run: |
        echo "[INFO] Applying mmap.c fix for specific version combo."
        sed -i 's/\s*vm_flags_clear(new_vma, VM_PAD_MASK);/                new_vma->vm_flags \&= ~VM_PAD_MASK;/' mm/mmap.c
        echo "MMAP_VM_FLAGS_FIX=true" >> "$GITHUB_ENV"

    - name: 'Final Kernel Fixes Summary'
      shell: bash
      run: |
        echo "## Final Kernel Fixes Summary" >> "$GITHUB_STEP_SUMMARY"
        echo "" >> "$GITHUB_STEP_SUMMARY"
        echo "**Kernel Version:** ${{ inputs.android_version }} + ${{ inputs.kernel_version }} (sublevel ${{ inputs.sublevel }})" >> "$GITHUB_STEP_SUMMARY"
        echo "" >> "$GITHUB_STEP_SUMMARY"
        echo "### Fix Status" >> "$GITHUB_STEP_SUMMARY"

        GLIBC_VERSION="$(ldd --version 2>/dev/null | head -n 1 | awk '{print $NF}')"
        if [ "$(printf '%s\n' "2.38" "$GLIBC_VERSION" | sort -V | head -n 1)" = "2.38" ]; then
          if [ "${MAKEFILE_FIXED:-false}" = "true" ]; then
            echo "- Makefile EXTRA_CFLAGS fix: applied" >> "$GITHUB_STEP_SUMMARY"
          elif [ "${MAKEFILE_FIXED:-false}" = "already_fixed" ]; then
            echo "- Makefile EXTRA_CFLAGS fix: already present" >> "$GITHUB_STEP_SUMMARY"
          else
            echo "- Makefile EXTRA_CFLAGS fix: pattern not found" >> "$GITHUB_STEP_SUMMARY"
          fi

          if [ "${PARSE_OPTIONS_FIXED:-false}" = "true" ]; then
            echo "- parse-options.c fix: applied" >> "$GITHUB_STEP_SUMMARY"
          else
            echo "- parse-options.c fix: not applicable" >> "$GITHUB_STEP_SUMMARY"
          fi
        else
          echo "- Makefile EXTRA_CFLAGS fix: skipped because GLIBC < 2.38" >> "$GITHUB_STEP_SUMMARY"
          echo "- parse-options.c fix: skipped because GLIBC < 2.38" >> "$GITHUB_STEP_SUMMARY"
        fi

        if [ "${MMAP_NAMESPACE_FIX:-not_applicable}" = "true" ]; then
          echo "- fs/namespace.c include fix: applied" >> "$GITHUB_STEP_SUMMARY"
        elif [ "${MMAP_NAMESPACE_FIX:-not_applicable}" = "already_present" ]; then
          echo "- fs/namespace.c include fix: already present" >> "$GITHUB_STEP_SUMMARY"
        else
          echo "- fs/namespace.c include fix: not applicable" >> "$GITHUB_STEP_SUMMARY"
        fi

        if [ "${MMAP_VM_FLAGS_FIX:-not_applicable}" = "true" ]; then
          echo "- mm/mmap.c VM_PAD_MASK fix: applied" >> "$GITHUB_STEP_SUMMARY"
        else
          echo "- mm/mmap.c VM_PAD_MASK fix: not applicable" >> "$GITHUB_STEP_SUMMARY"
        fi