This minimalist script depends only on programs from OpenBSD base. To encrypt your files use bioctl(8) with CRYPTO, openssl(1), or scrypt.
Tested on OpenBSD 6.3 and 6.4
arc is an archiver with compression. It creates a spec of the original file tree with mtree(8), then creates a compressed archive with pax(1) and gzip(1).
$ ftp -Vo ~/bin/arc https://rgz.ee/bin/arc arc 100% |********************| 1192 00:00 $ chmod +x ~/bin/arc
$ arc ~/src /tmp/archive /home/romanzolotarev/src 24080K /tmp/archive 16752K $ ls -1 /tmp/archive* /tmp/archive /tmp/archive.tree.gz /tmp/archive.tree.sha256 $
Restore a single file from the archive and compare its contents with the original.
$ cd /tmp $ pax -pe -rzf /tmp/archive ./www/arc.md $ diff ~/src/www/arc.md ./www/arc.md $
arc_extract restores the archive into the current directory and compares restored files with the spec created by mtree(8).
Note: time of original files in the spec is in nanoseconds, while pax(1) restores time in seconds. Therefore, we use sed(1) to cut those nanoseconds.
$ mkdir -p /tmp/restored && cd /tmp/restored $ arc_extract /tmp/archive $
or just do the same manually:
$ mkdir -p /tmp/restored && cd /tmp/restored $ pax -pe -rzf /tmp/archive $ gunzip < /tmp/archive.tree.gz > /tmp/archive.tree $ sha256 < tree; cat /tmp/archive.tree.sha256 a4bc68... a4bc68... $ sed 's/time=\([0-9]*\)\.[0-9]*/time=\1.0/' /tmp/archive.tree|mtree $