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add an essay about rsync options

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Michael Hudson-Doyle 2023-08-23 22:30:44 +12:00
parent 2b80fdecd2
commit e992090dca
1 changed files with 17 additions and 1 deletions
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18
live-build/lb_binary_layered
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@ -152,7 +152,23 @@ build_layered_squashfs () {
# layer.
mkdir -p chroot-2 "$overlay_dir-2"
mount_overlay "$lowerdirs" "$overlay_dir-2" chroot-2
rsync -caXHAS --no-t --del chroot/ chroot-2/
# rsync takes many, many options. The subset
# we pass here is quite important:
# -a is standard to operate in the basic way required here.
# -X to preserve xattrs
# -H to preserve hardlinks
# -A to preserve ACLs
# -S to preserve sparseness
# --checksum to skip copies based on the content of the file
# (rather than the default which is to skip copies based
# on size + mtime)
# --no-times to not copy mtimes from source to dest (we
# don't care about mtime in the image and want to
# deduplicate files that have indentical contents but
# different mtimes)
# --del because we want to remove files that have been
# deleted in this layer.
rsync -aXHAS --checksum --no-times --del chroot/ chroot-2/
umount chroot-2
rmdir chroot-2
overlay_dir="$overlay_dir-2"