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-rwxr-xr-xextra/scripts/install_headers.sh46
1 files changed, 26 insertions, 20 deletions
diff --git a/extra/scripts/install_headers.sh b/extra/scripts/install_headers.sh
index 5f57695cb..dd6bc9aee 100755
--- a/extra/scripts/install_headers.sh
+++ b/extra/scripts/install_headers.sh
@@ -50,7 +50,8 @@ done
# Just copy (no sanitization) some kernel headers.
eval `grep ^KERNEL_HEADERS "$top_builddir/.config"`
-if ! test -d "$KERNEL_HEADERS/asm" \
+if ! test "$KERNEL_HEADERS" \
+|| ! test -d "$KERNEL_HEADERS/asm" \
|| ! test -d "$KERNEL_HEADERS/asm-generic" \
|| ! test -d "$KERNEL_HEADERS/linux" \
; then
@@ -58,25 +59,30 @@ if ! test -d "$KERNEL_HEADERS/asm" \
echo "Check KERNEL_HEADERS= in your .config file."
exit 1
fi
-# NB: source or target files and directories may be symlinks,
-# and for all we know, good reasons.
-# We must work correctly in these cases. This includes "do not replace
-# target symlink with real directory" rule. So, no rm -rf here please.
-mkdir -p "$2/asm" 2>/dev/null
-mkdir -p "$2/asm-generic" 2>/dev/null
-mkdir -p "$2/linux" 2>/dev/null
-# Exists, but is not a dir? That's bad, bail out
-die_if_not_dir "$2/asm" "$2/asm-generic" "$2/linux"
-# cp -HL creates regular destination files even if sources are symlinks.
-# This is intended.
-# (NB: you need busybox 1.11.x for this. earlier ones are slightly buggy)
-cp -RHL "$KERNEL_HEADERS/asm"/* "$2/asm" || exit 1
-cp -RHL "$KERNEL_HEADERS/asm-generic"/* "$2/asm-generic" || exit 1
-cp -RHL "$KERNEL_HEADERS/linux"/* "$2/linux" || exit 1
-if ! test -f "$2/linux/version.h"; then
- echo "Warning: '$KERNEL_HEADERS/linux/version.h' is not found"
- echo "in kernel headers directory specified in .config."
- echo "Some programs won't like that. Consider fixing it by hand."
+# Do the copying only if src and dst dirs are not the same
+# Be thorough: do not settle just for textual compare,
+# and guard against "pwd" being handled as shell builtin
+if test `(cd "$KERNEL_HEADERS"; env pwd)` != `(cd "$2"; env pwd)`; then
+ # NB: source or target files and directories may be symlinks,
+ # and for all we know, good reasons.
+ # We must work correctly in these cases. This includes "do not replace
+ # target symlink with real directory" rule. So, no rm -rf here please.
+ mkdir -p "$2/asm" 2>/dev/null
+ mkdir -p "$2/asm-generic" 2>/dev/null
+ mkdir -p "$2/linux" 2>/dev/null
+ # Exists, but is not a dir? That's bad, bail out
+ die_if_not_dir "$2/asm" "$2/asm-generic" "$2/linux"
+ # cp -HL creates regular destination files even if sources are symlinks.
+ # This is intended.
+ # (NB: you need busybox 1.11.x for this. earlier ones are slightly buggy)
+ cp -RHL "$KERNEL_HEADERS/asm"/* "$2/asm" || exit 1
+ cp -RHL "$KERNEL_HEADERS/asm-generic"/* "$2/asm-generic" || exit 1
+ cp -RHL "$KERNEL_HEADERS/linux"/* "$2/linux" || exit 1
+ if ! test -f "$2/linux/version.h"; then
+ echo "Warning: '$KERNEL_HEADERS/linux/version.h' is not found"
+ echo "in kernel headers directory specified in .config."
+ echo "Some programs won't like that. Consider fixing it by hand."
+ fi
fi