ref: 55104888794793069cc60b2d00d46a530f1c1cbe
parent: 0ff4099a608e58970d6ad38cef5b27c53fd3bbf4
parent: 07e3d1c2547049a23d2768f404334d1ef205b452
author: Ori Bernstein <[email protected]>
date: Wed Nov 20 11:12:21 EST 2019
merge
--- a/sys/man/1/vac
+++ b/sys/man/1/vac
@@ -6,6 +6,9 @@
[
.B -mqsv
] [
+.B -a
+.I vacfile
+] [
.B -b
.I blocksize
] [
@@ -23,12 +26,15 @@
] [
.B -h
.I host
+] [
+.B -x
+.I excludefile
]
.I file ...
.PP
.B unvac
[
-.B -Tctv
+.B -Tcdtv
] [
.B -h
.I host
@@ -70,6 +76,26 @@
.TF "-d\fI oldvacfile"
.PD
.TP
+.BI -a " vacfile
+Specifies that vac should create or update a backup archive, inserting
+the files under an extra two levels of directory hierarchy named
+.I yyyy/mmdd
+(year, month, day)
+in the style of the dump file system
+(see Plan 9's \fIfs\fR(4)).
+If
+.I vacfile
+already exists, an additional backup day is added to the
+existing hierarchy, behaving as though the
+.B -d
+flag was specified giving the most recent backup tree in the archive.
+Typically, this option
+is used as part of a nightly backup script.
+This option cannot be used with
+.B -d
+or
+.BR -f .
+.TP
.BI -b " blocksize
Specifies the block size that data will be broken into.
The units for the size can be specified by appending
@@ -90,6 +116,12 @@
Do not include the file or directory specified by
.IR exclude .
This option may be repeated multiple times.
+.I Exclude
+can be a shell pattern as accepted by
+.IR rc (1),
+with one extension:
+.B \&...
+matches any sequence of characters including slashes.
.TP
.BI -f " vacfile
The results of
@@ -137,6 +169,27 @@
.B -v
Produce more verbose output on standard error, including the name of the files added to the archive
and the vac archives that are expanded and merged.
+.TP
+.BI -x " excfile
+Read exclude patterns from the file
+.IR excfile .
+Blank lines and lines beginning with
+.B #
+are ignored.
+All other lines should be of the form
+.B include
+.I pattern
+or
+.B exclude
+.I pattern .
+When considering whether to include a directory or file
+in the vac archive,
+the earliest matching pattern in the file
+applies.
+The patterns are the same syntax accepted by the
+.B -e
+option.
+This option may be repeated multiple times.
.PP
.I Unvac
lists or extracts files stored in the vac archive
@@ -156,9 +209,12 @@
.B -c
Write extracted files to standard output instead of creating a file.
.TP
-.B -h
-as per
-.IR vac .
+.B -d
+Reduce the number of blocks read from Venti by
+comparing the files to be stored with their counterparts
+in the file system.
+This option cannot be used with
+.BR -c .
.TP
.B -t
Print a list of the files to standard output rather than extracting them.
@@ -167,6 +223,10 @@
If extracting files, print the name of each file and directory
to standard error.
If listing files, print metadata in addition to the names.
+.TP
+.B -h
+as per
+.IR vac .
.SH SOURCE
.B /sys/src/cmd/vac
.SH "SEE ALSO"
--- a/sys/src/cmd/vac/vac.c
+++ b/sys/src/cmd/vac/vac.c
@@ -8,7 +8,7 @@
void
usage(void)
{- fprint(2, "vac [-imqsv] [-a archive.vac] [-b bsize] [-d old.vac] [-f new.vac] [-e exclude]... [-h host] file...\n");
+ fprint(2, "vac [-imqsv] [-a archive.vac] [-b bsize] [-d old.vac] [-e exclude] [-f new.vac] [-i name] [-h host] [-x excludefile] file...\n");
threadexitsall("usage");}