db8c40249f
pkgtasks is a shell script library to ease writing POSIX-compliant
shell scripts to handle common tasks during installation or removal
of a package, e.g.,
* creating groups and users needed by the package
* creating and removing directories with special permissions and
ownership,
* copying example config files to their final locations during
package installation, and removing them during package removal
if they don't differ from the example ones,
* reminding the user of files that may be customized after
package installation.
120 lines
4 KiB
Text
120 lines
4 KiB
Text
# Copyright (c) 2017 The NetBSD Foundation, Inc.
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# All rights reserved.
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#
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# This code is derived from software contributed to The NetBSD Foundation
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# by Johnny C. Lam.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# NAME
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# refcount.subr -- reference-count API
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#
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# SYNOPSIS
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# task_refcount exists database resource
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# task_refcount delete database resource
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# task_refcount add [-t token] database resource
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# task_refcount remove [-t token] database resource
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#
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# task_refcount prop_exists database resource property
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# task_refcount prop_put database resource property [value ...]
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# task_refcount prop_match database resource property [value ...]
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# task_refcount prop_delete database resource property
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#
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# DESCRIPTION
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# task_refcount exists database resource
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# Checks whether there is a reference on the resource.
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#
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# task_refcount delete database resource
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# Deletes any reference counts and properties on the
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# resource.
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#
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# task_refcount add [-t token] database resource
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# task_refcount remove [-t token] database resource
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# Adds or removes a reference identified by token on the
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# resource.
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#
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# task_refcount prop_exists database resource property
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# Checks whether a stored value exists for the property on
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# the resoure for the package.
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#
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# task_refcount prop_delete database resource property
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# Removes the property on the resource for the package.
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#
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# task_refcount prop_put database resource property [value ...]
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# Stores a value for the property on the resource for the
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# package. If no value is given, then the default value for
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# the property is stored.
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#
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# task_refcount prop_match database resource property [value ...]
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# Checks whether the stored value of the property on the
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# resource for the package matches the given value. If no
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# value is given, then the default value for the property
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# is used.
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#
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# RETURN VALUES
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# The exists, prop_exists and prop_match commands return 0 on success,
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# and >0 otherwise.
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#
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# The remaining commands return 0 on success, and >0 if an error
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# occurs.
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#
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# EXAMPLES
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# o Adding a reference count on resource alpha:
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#
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# if task_refcount exists resource alpha; then
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# refcount_was_zero=
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# else
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# refcount_was_zero="yes"
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# fi
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# if task_refcount add resource alpha; then
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# if resource_exists alpha; then
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# if [ -n "$refcount_was_zero" ]; then
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# task_refcount prop_put resource alpha preexist
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# fi
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# else
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# # create resource alpha
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# ...
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# fi
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# fi
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#
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# o Removing a reference count on resource alpha:
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#
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# if task_refcount remove resource alpha; then
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# if task_refcount exists resource alpha; then
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# : "refcount is not zero"
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# elif task_refcount prop_exists resource alpha preexist; then
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# : "resource was pre-existing; don't remove"
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# elif resource_exists alpha; then
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# # destroy resource alpha
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# ...
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# fi
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# fi
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#
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__task_refcount__="yes"
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task_load refcount_file
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task_refcount()
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{
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task_refcount_file "$@"
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}
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