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March 2, 2021 17:54
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shell script to produce a tar representing the difference between two directories or one directory and a base tar. (can be used as a filesystem patch)
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#!/bin/bash | |
BASE=$2 | |
OUT=diff.tar | |
if test -z "$TMP"; then | |
TMP=`mktemp -d -t tardiff-XXXXXXXX` | |
else | |
TMP=`realpath $TMP` | |
fi | |
if [ -f "$BASE" ]; then | |
tar -tf $BASE > $TMP/tar.list | |
rg --passthru '(^\.?/)|(/$)' -r '' $TMP/tar.list | sort | uniq | rg -N . > $TMP/files.base | |
else | |
(cd $BASE && fd -uu ) | sort | uniq > $TMP/files.base | |
fi | |
(cd $1 && fd -uu | sort | uniq) > $TMP/files.1 | |
cat $TMP/files.1 $TMP/files.base | sort | uniq -d > $TMP/files.common | |
if [ -f "$BASE" ]; then | |
#foo $TMP/files.common.t $TMP/tar.list > $TMP/files.common.t | |
sed -e 's/^/.\//' $TMP/files.common > $TMP/files.common.t | |
tar -f "$BASE" --diff --directory $1 --no-recursion -T $TMP/files.common.t | |
else | |
( cd $BASE && tar -c --no-recursion -T $TMP/files.common ) | tee asdf | tar --diff --directory $1 | |
fi | grep -v 'Mod time differs' | rg --passthru ': .*differs?$' -r '' \ | |
| rg --passthru '^\./' -r '' | sort | uniq > $TMP/files.changed | |
cat $TMP/files.1 $TMP/files.common | sort | uniq -u > $TMP/files.added | |
cat $TMP/files.base $TMP/files.common | sort | uniq -u > $TMP/.deleted | |
(tar -c -C $1 --no-recursion -T $CWD/$TMP/files.changed -T $CWD/$TMP/files.added) > $OUT | |
tar -rf $OUT -C $TMP .deleted |
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