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cmd: add 'help' subcommand to zpool and zfs

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'program help subcommand' is a reasonably common pattern for
multifunction command-line programs. This commit adds support for that
style to the zpool and zfs commands.

When run as 'zpool help [<topic>]' or 'zfs help [<topic>]', executes the
'man' program on the PATH with the most likely manpage name for the
requested topic: "zpool-<topic>" or "zfs-<topic>" for subcommands, or
"zpool<topic>" or "zfs<topic>" for the "concepts" and "props" topics.
If no topic is supplied, uses the top "zpool" or "zfs" pages.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Kay Pedersen <mail@mkwg.de>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #15288
This commit is contained in:
Rob N
2023-09-20 02:06:47 +10:00
committed by Brian Behlendorf
parent 9aa1a2878e
commit 3af63683fe
3 changed files with 64 additions and 1 deletions
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tests/zfs-tests/tests/functional/cli_root/zfs_program/zfs_program_json.ksh
+3 -1
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@@ -117,7 +117,9 @@ usage:
For the property list, run: zfs set|get
For the delegated permission list, run: zfs allow|unallow")
For the delegated permission list, run: zfs allow|unallow
For further help on a command or topic, run: zfs help [<topic>]")
cnt=0
for cmd in ${neg_cmds[@]}; do
log_mustnot zfs program $cmd $TESTPOOL $TESTZCP $TESTDS 2>&1