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classes/image: Use xargs to set file timestamps

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Instead of having find directly invoke touch for each file in the root
file system, pass a list to xargs for batching. This significantly
reduces the number of times the touch program is invoked and speeds up
the do_image task time:

    PKG           TASK      ABSDIFF  RELDIFF  CPUTIME1 -> CPUTIME2
    my-image      do_image   -45.3s   -94.2%     48.1s -> 2.8s

    Cumulative cputime:
      -44.3s    -92.3%    00:48.1 (48.1s) -> 00:03.7 (3.7s)

(From OE-Core rev: 15c65f90a3aa1e98c2beab2539403157df1fca08)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Joshua Watt
2021-05-05 16:40:06 -05:00
committed by Richard Purdie
parent c8e1aeebd8
commit ad3879eb61
1 changed files with 1 additions and 1 deletions
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2
meta/classes/image.bbclass
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@@ -657,7 +657,7 @@ reproducible_final_image_task () {
fi
# Set mtime of all files to a reproducible value
bbnote "reproducible_final_image_task: mtime set to $REPRODUCIBLE_TIMESTAMP_ROOTFS"
find ${IMAGE_ROOTFS} -exec touch -h --date=@$REPRODUCIBLE_TIMESTAMP_ROOTFS {} \;
find ${IMAGE_ROOTFS} -print0 | xargs -0 touch -h --date=@$REPRODUCIBLE_TIMESTAMP_ROOTFS
fi
}