[augeas-devel] Setting list values in the tree

[Raphaël Pinson]

Hello,


In order to easily manage list entries in the tree, it would be useful to
have a `setlist` API entry, which would manage both named nodes as well as
`seq` ones. It could look like this:

    setlist <path> <label|seq> <replace|add|merge> <value> [value [value
[…]]]

For example, having `/files/etc/ssh/sshd_config/AcceptEnv` as:

    { "AcceptEnv"
      { "1" = "LC_*" } }

The following call:

    setlist /files/etc/ssh/sshd_config/AcceptEnv seq replace LANG LC_*

would produce:

    { "AcceptEnv"
      { "1" = "LANG" }
      { "2" = "LC_*" } }

while

    setlist /files/etc/ssh/sshd_config/AcceptEnv seq add LANG FOO

would result in:

    { "AcceptEnv"
      { "1" = "LC_*" }
      { "2" = "LANG" }
      { "3" = "FOO" } }

and

    setlist /files/etc/ssh/sshd_config/AcceptEnv seq merge LANG LC_*

in

    { "AcceptEnv"
      { "1" = "LANG" }
      { "2" = "LC_*" } }

For non-`seq` entries, we could specify the label. For example, having
`/files/etc/group/audio` set to:

    { "audio"
      { "password" = "x" }
      { "gid" = "29" }
      { "user" = "pulse" }
      { "user" = "rpinson" } }

we could do:

    setlist /files/etc/group/audio user add foo bar

resulting in:

    { "audio"
      { "password" = "x" }
      { "gid" = "29" }
      { "user" = "pulse" }
      { "user" = "rpinson" }
      { "user" = "foo" }
      { "user" = "bar" } }

If the nodes need to be created on sublevels, you would use a slash in the
label:

    setlist /path/to/node entry/user replace foo bar



What are your thoughts? What could the C API call look like?


-- 
Raphaël Pinson
Administrateur Systèmes & Réseaux
Camptocamp France
Savoie Technolac
BP 352
48, avenue du Lac du Bourget
73372 Le Bourget du Lac, Cedex
www.camptocamp.com
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