A macOS shell script for syncing the kib.kiev.ua/x86docs documentation archive

x86docssync

#!/bin/sh

# x86docssync - Syncs documents from kib.kiev.ua/x86docs
#
# Written in 2020, 2022 by Lawrence Velázquez <[email protected]>.
#
# To the extent possible under law, the author(s) have dedicated all
# copyright and related and neighboring rights to this software to the
# public domain worldwide.  This software is distributed without any
# warranty.
#
# For a copy of the CC0 Public Domain Dedication, see
# <https://creativecommons.org/publicdomain/zero/1.0/>.


if test "$#" -eq 0; then
    echo 'usage: x86docssync target_dir' >&2
    exit 1
fi

dst=$1


# ---- STEP 1: SYNC -----

rsyncsrc=rsync://[email protected]/x86docs
httpssrc=https://kib.kiev.ua/x86docs

RSYNC_PASSWORD= rsync --chmod=D755,F644 --recursive --times \
                      --human-readable --itemize-changes --stats --verbose \
                      -- "$rsyncsrc" "$dst"
rc=$?


# ----- STEP 2: ADD EXTRANEOUS EXTENDED ATTRIBUTE -----

cd -- "$dst" || exit

# Export these so I don't have to repeatedly pass them to the script
# through the positional parameters.
export rsyncsrc httpssrc

# NOTE: Remember to embed single quotes properly.
writexattr='
for f
do
    # Percent-encode quotation marks to avoid code-injecting the
    # property list.  Fully encoding the URL is not worth the effort.
    pencf=$(printf '\''%s.\n'\'' "${f#.}" | sed '\''s/"/%22/g'\'')
    rsyncurl=${rsyncsrc}${pencf%.}
    httpsurl=${httpssrc}${pencf%.}
    wherefromval=$(printf '\''["%s","%s"]'\'' "$rsyncurl" "$httpsurl" \
                    | plutil -convert binary1 -o - - \
                    | od -A n -t x1 -v)
    test -n "$wherefromval" || continue
    xattr -wx com.apple.metadata:kMDItemWhereFroms "$wherefromval" "$f"
done
'

# Add "Where from" xattr to files that don't have it.
echo 'Updating xattr com.apple.metadata:kMDItemWhereFroms...' >&2
find . -type f ! -xattrname com.apple.metadata:kMDItemWhereFroms \
        ! -name '.*' -exec sh -c "$writexattr" sh {} +


# ---- STEP 3: PROPAGATE RSYNC'S EXIT STATUS -----

exit "$rc"