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support/misc/relocate-sdk.sh: pre-calculate files in need of relocation

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Currently, the relocate-sdk.sh script scans the whole extracted SDK tree
to find instances of paths it needs to replace, which can take a
significant amount of time when the SDK is large, particularly relative
to the number of files that actually need to change.

However, the resulting list only depends on the SDK tarball itself, so
we can calculate it at build time and ship it with the tarball so
relocate-sdk.sh can use it directly.

Testing this on my machine with somewhat IOPS-limited rotating media,
the time goes down from:

$ time ./relocate-sdk.sh
Relocating the buildroot SDK from [...] to [...] ...
./relocate-sdk.sh  5.19s user 26.21s system 9% cpu 5:34.40 total

To:

$ time ./relocate-sdk.sh
Relocating the buildroot SDK from [...] to [...] ...
./relocate-sdk.sh  0.49s user 0.29s system 103% cpu 0.749 total

Signed-off-by: Florian Larysch <fl@n621.de>
Signed-off-by: Arnout Vandecappelle <arnout@rnout.be>
This commit is contained in:
Florian Larysch
2025-05-31 02:05:41 +02:00
committed by Arnout Vandecappelle
parent 32c6fffd41
commit 63877f9e86
2 changed files with 13 additions and 8 deletions
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10
Makefile
View File

@@ -602,6 +602,16 @@ prepare-sdk: world
@$(call MESSAGE,"Preparing the SDK")
$(INSTALL) -m 755 $(TOPDIR)/support/misc/relocate-sdk.sh $(HOST_DIR)/relocate-sdk.sh
mkdir -p $(HOST_DIR)/share/buildroot
(\
export LC_ALL=C; \
grep -lr '$(HOST_DIR)' '$(HOST_DIR)' | while read -r FILE; do \
if file -b --mime-type "$$FILE" | grep -q '^text/' && \
[ "$$FILE" != '$(HOST_DIR)/share/buildroot/sdk-location' ] && \
[ "$$FILE" != '$(HOST_DIR)/share/buildroot/sdk-relocs' ]; then \
echo "$$FILE"; \
fi; \
done \
) | sed -e 's|^$(HOST_DIR)|.|g' > $(HOST_DIR)/share/buildroot/sdk-relocs
echo $(HOST_DIR) > $(HOST_DIR)/share/buildroot/sdk-location
BR2_SDK_PREFIX ?= $(GNU_TARGET_NAME)_sdk-buildroot

11
support/misc/relocate-sdk.sh
View File

@@ -37,15 +37,10 @@ fi
echo "Relocating the buildroot SDK from ${OLDPATH} to ${NEWPATH} ..."
# Make sure file uses the right language
export LC_ALL=C
# Replace the old path with the new one in all text files
grep -lr "${OLDPATH}" . | while read -r FILE ; do
if file -b --mime-type "${FILE}" | grep -q '^text/' && [ "${FILE}" != "${LOCFILE}" ]
then
sed -i "s|${OLDPATH}|${NEWPATH}|g" "${FILE}"
fi
done
while read -r FILE ; do
sed -i "s|${OLDPATH}|${NEWPATH}|g" "${FILE}"
done < share/buildroot/sdk-relocs
# At the very end, we update the location file to not break the
# SDK if this script gets interruted.