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OpenZFS 8605 - zfs channel programs fix zfs.exists

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Authored by: Chris Williamson <chris.williamson@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Ported-by: Don Brady <don.brady@delphix.com>

zfs.exists() in channel programs doesn't return any result, and should
have a man page entry. This patch corrects zfs.exists so that it
returns a value indicating if the dataset exists or not. It also adds
documentation about it in the man page.

OpenZFS-issue: https://www.illumos.org/issues/8605
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/1e85e111
This commit is contained in:
Chris Williamson
2018-02-08 09:17:52 -07:00
committed by Brian Behlendorf
parent d99a015343
commit 475eca4908
6 changed files with 88 additions and 3 deletions
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man/man8/zfs-program.8
+12
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@@ -289,6 +289,18 @@ msg (string)
.Bd -ragged -compact -offset "xxxx"
Debug message to be printed.
.Ed
.It Em zfs.exists(dataset)
Returns true if the given dataset exists, or false if it doesn't.
A fatal error will be thrown if the dataset is not in the target pool.
That is, in a channel program running on rpool,
zfs.exists("rpool/nonexistent_fs") returns false, but
zfs.exists("somepool/fs_that_may_exist") will error.
.Pp
dataset (string)
.Bd -ragged -compact -offset "xxxx"
Dataset to check for existence.
Must be in the target pool.
.Ed
.It Em zfs.get_prop(dataset, property)
Returns two values.
First, a string, number or table containing the property value for the given