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@ -107,57 +107,6 @@ lb_chroot_includes () {
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cd "${OLDPWD}"
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}
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reduce_pass_size () {
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# Remove duplicated files between parent and current pass
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# Note the empty directories created in a child pass are not removed
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local pass=$1
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local parent="$(get_parent_pass $pass)"
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$(is_root_layer $pass) && return
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pass_dir="overlay.${pass}"
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parent_pass_dir="overlay.${parent}"
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local list_pass=$(mktemp)
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local list_parent=$(mktemp)
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(cd $pass_dir && find . ! -type d -printf "%h/%f|%s|%y|%U|%G|%m\n"|sort > $list_pass)
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(cd $parent_pass_dir && find . ! -type d -printf "%h/%f|%s|%y|%U|%G|%m\n"|sort > $list_parent)
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# Only iterate on common files with same type, owner, permission and size
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comm -12 $list_pass $list_parent|cut -d'|' -f1|while read f; do
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# If file contents are different, keep it
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if ! diff --brief --no-dereference "$pass_dir/$f" "$parent_pass_dir/$f" >/dev/null; then
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continue
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fi
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p="$(dirname "$f")"
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while [ "$p" != . ]; do
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# As explained in the overlayfs documentation
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# https://www.kernel.org/doc/html/latest/filesystems/overlayfs.html#whiteouts-and-opaque-directories
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# an xattr of trusted.overlay.opaque indicates an 'opaque' directory
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# that was deleted from the overlay. Removing files from within the
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# directory, even if identical with one in the lower layer, will result
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# in it going missing from the combined filesystem.
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#
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# It would be possible to be more clever, e.g. if the two directories
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# are still similar, we could the delete the attribute and convert any
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# still-needed deletions to whiteouts but it doesn't seem worth it in
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# the cases seen so far.
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if [ -n "$(getfattr -n trusted.overlay.opaque -h --only-values -- "$pass_dir/$p" 2>/dev/null)" ]; then
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Echo_message "reduce_pass_size: '%s' would be removed from overlay but for trusted.overlay.opaque on '%s'" "$f" "$p"
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continue 2
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fi
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p="$(dirname "$p")"
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done
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# Files are strictly identical between the 2 passes (only mod or access times differs). No need for unused delta.
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Echo_message "reduce_pass_size: '%s' is strictly identical between %s and %s. Removing." "$f" "$pass" "$parent"
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rm "$pass_dir/$f"
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done
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rm $list_pass
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rm $list_parent
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}
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create_chroot_pass () {
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local pass=$1
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shift 1 # restore ${*}
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@ -182,8 +131,8 @@ create_chroot_pass () {
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mkdir -p "$overlay_dir/"
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lowerdirs=$(get_lowerdirs_for_pass $pass)
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if [ -n "$lowerdirs" ]; then
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mkdir -p chroot/
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mount_overlay "$lowerdirs" "$overlay_dir" chroot/
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mkdir -p chroot "${overlay_dir}-initial"
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mount_overlay "$lowerdirs" "${overlay_dir}-initial" chroot/
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else
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ln -s "$overlay_dir/" chroot
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fi
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@ -319,13 +268,22 @@ create_chroot_pass () {
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lb chroot_devpts remove ${*}
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if [ -n "$lowerdirs" ]; then
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umount chroot
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rmdir chroot
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# Although the current chroot was created as an overlay over
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# the previous layer, many operations can result in redundant
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# files in the upperdir. Rather than trying to minimize the
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# overlay by hand, we rsync the chroot into a fresh overlay,
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# rely on rsyncs ability to avoid redundant file operations,
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# and take _that_ overlay's upperdir as the content of the
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# layer.
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mkdir chroot-2
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mount_overlay "$lowerdirs" "$overlay_dir" chroot-2/
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rsync -aXHAS --del chroot/ chroot-2/
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umount chroot chroot-2
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rmdir chroot chroot-2
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rm -rf ${overlay_dir}-initial
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else
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rm chroot
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fi
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reduce_pass_size $pass
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}
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if [ ! -d chroot.bootstrap/ ]; then
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Łukasz 'sil2100' Zemczak
1 year ago