native::Core

Section: User Contributed Perl Documentation (3)
Updated: 2019-01-20
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NAME

SVN::Core - Core module of the subversion perl bindings

SYNOPSIS

    use SVN::Core; # does apr_initialize and cleanup for you

    # create a root pool and set it as default pool for later use
    my $pool = SVN::Pool->new_default;

    sub something {
        # create a subpool of the current default pool
        my $pool = SVN::Pool->new_default_sub;
        # some svn operations...

        # $pool gets destroyed and the previous default pool
        # is restored when $pool's lexical scope ends
    }

    # svn_stream_t as native perl io handle
    my $stream = $txn->root->apply_text('trunk/filea', undef);
    print $stream $text;
    close $stream;

    # native perl io handle as svn_stream_t
    SVN::Repos::dump_fs($repos, \*STDOUT, \*STDERR,
                        0, $repos->fs->youngest_rev, 0);

DESCRIPTION

SVN::Core implements higher level functions of fundamental subversion functions.

FUNCTIONS

SVN::Core::auth_open([auth provider array]);: Takes a reference to an array of authentication providers and returns an auth_baton. If you use prompt providers you can not use this function, but need to use the auth_open_helper.
SVN::Core::auth_open_helper([auth provider array]);: Prompt providers return two values instead of one. The 2nd parameter is a reference to whatever was passed into them as the callback. auth_open_helper splits up these arguments, passing the provider objects into auth_open which gives it an auth_baton and putting the other ones in an array. The first return value of this function is the auth_baton, the second is a reference to an array containing the references to the callbacks.
These callback arrays should be stored in the object the auth_baton is attached to.

OTHER OBJECTS

svn_stream_t - SVN::Stream

You can use native perl io handles (including io globs) as svn_stream_t in subversion functions. Returned svn_stream_t are also translated into perl io handles, so you could access them with regular print, read, etc.

Note that some functions take a stream to read from or write to, but do not close the stream while still holding the reference to the io handle. In this case the handle won't be destroyed properly. You should always set up the correct default pool before calling such functions.

svn_pool_t - SVN::Pool

The perl bindings significantly simplify the usage of pools, while still being manually adjustable.

For functions requiring a pool as the last argument (which are, almost all of the subversion functions), the pool argument is optional. The default pool is used if it is omitted. When "SVN::Core" is loaded, it creates a new default pool, which is also available from "SVN::Core->gpool".

For callback functions providing a pool to your subroutine, you could also use $pool->default to make it the default pool in the scope.

Methods

new([$parent]): Create a new pool. The pool is a root pool if $parent is not supplied.
new_default([$parent]): Create a new pool. The pool is a root pool if $parent is not supplied. Set the new pool as default pool.
new_default_sub: Create a new subpool of the current default pool, and set the resulting pool as new default pool.
clear: Clear the pool.
DESTROY: Destroy the pool. If the pool was the default pool, restore the previous default pool. This is normally called automatically when the SVN::Pool object is no longer used and destroyed by the perl garbage collector.

svn_error_t - SVN::Error

By default the perl bindings handle exceptions for you. The default handler automatically croaks with an appropriate error message. This is likely sufficient for simple scripts, but more complex usage may demand handling of errors.

You can override the default exception handler by changing the $SVN::Error::handler variable. This variable holds a reference to a perl sub that should be called whenever an error is returned by a svn function. This sub will be passed a svn_error_t object. Its return value is ignored.

If you set the $SVN::Error::handler to undef then each call will return an svn_error_t object as its first return in the case of an error, followed by the normal return values. If there is no error then a svn_error_t will not be returned and only the normal return values will be returned. When using this mode you should be careful only to call functions in array context. For example: my ($ci) = $ctx->mkdir('http://svn/foo'); In this case $ci will be an svn_error_t object if an error occurs and a svn_client_commit_info object otherwise. If you leave the parenthesis off around $ci (scalar context) it will be the commit_info object, which in the case of an error will be undef.

If you plan on using explicit exception handling, understanding the exception handling system the C API uses is helpful. You can find information on it in the HACKING file and the API documentation. Looking at the implementation of SVN::Error::croak_on_error and SVN::Error::expanded_message may be helpful as well.

$svn_error_t->apr_err()

APR error value, possibly SVN_ custom error.

$svn_error_t->message()

Details from producer of error.

$svn_error_t->child()

svn_error_t object of the error that's wrapped.

$svn_error_t->pool()

The pool holding this error and any child errors it wraps.

$svn_error_t->file()

Source file where the error originated.

$svn_error_t->line()

Source line where the error originated.

SVN::Error::strerror($apr_status_t)

Returns the english description of the status code.

$svn_error_t->strerror()

Returns the english description of the apr_err status code set on the $svn_error_t. This is short for: SVN::Error::strerror($svn_error_t->apr_err());

SVN::Error::create($apr_err, $child, $message);

Returns a new svn_error_t object with the error status specified in $apr_err, the child as $child, and error message of $message.

SVN::Error::quick_wrap($child, $new_msg); or $child->quick_wrap($new_msg);

A quick n' easy way to create a wrappered exception with your own message before throwing it up the stack.

$child is the svn_error_t object you want to wrap and $new_msg is the new error string you want to set.

SVN::Error::compose($chain, $new_error); or $chain->compose($new_error);

Add new_err to the end of $chain's chain of errors.

The $new_err chain will be copied into $chain's pool and destroyed, so $new_err itself becomes invalid after this function.

SVN::Error::clear($svn_error_t); or $svn_error_t->clear();

Free the memory used by $svn_error_t, as well as all ancestors and descendants of $svn_error_t.

You must call this on every svn_error_t object you get or you will leak memory.

SVN::Error::expanded_message($svn_error_t) or $svn_error_t->expanded_message()

Returns the error message by tracing through the svn_error_t object and its children and concatenating the error messages. This is how the internal exception handlers get their error messages.

SVN::Error::is_error($value)

Returns true if value is of type svn_error. Returns false if value is anything else or undefined. This is useful for seeing if a call has returned an error.

SVN::Error::croak_on_error

Default error handler. It takes an svn_error_t and extracts the error messages from it and croaks with those messages.

It can be used in two ways. The first is detailed above as setting it as the automatic exception handler via setting $SVN::Error::handler.

The second is if you have $SVN::Error::handler set to undef as a wrapper for calls you want to croak on when there is an error, but you don't want to write an explicit error handler. For example:

my $rev = SVN::Error::croak_on_error($ctx->checkout($url,$path,'HEAD',1));

If there is no error then croak_on_error will return the arguments passed to it unchanged.

SVN::Error::confess_on_error

The same as croak_on_error except it will give a more detailed stack backtrace, including internal calls within the implementation of the perl bindings. This is useful when you are doing development work on the bindings themselves.

SVN::Error::ignore_error

This is useful for wrapping around calls which you wish to ignore any potential error. It checks to see if the first parameter is an error and if it is it clears it. It then returns all the other parameters.

svn_log_changed_path_t

$lcp->action(): 'A'dd, 'D'elete, 'R'eplace, 'M'odify
$lcp->copyfrom_path(): Source path of copy, or "undef" if there isn't any previous revision history.
$lcp->copyfrom_rev(): Source revision of copy, or $SVN::Core::INVALID_REVNUM if there is no previous history.

svn_log_changed_path2_t

An object to represent a path that changed for a log entry.

$lcp->action(): 'A'dd, 'D'elete, 'R'eplace, 'M'odify
$lcp->copyfrom_path(): Source path of copy, or "undef" if there isn't any previous revision history.
$lcp->copyfrom_rev(): Source revision of copy, or $SVN::Core::INVALID_REVNUM if there is no previous history.
$lcp->node_kind(): The type of the node, a $SVN::Node enum; may be $SVN::Node::unknown.
$lcp->text_modified(): Is the text modified, a "SVN::Tristate" enum, may be $SVN::Tristate::unknown.
$lcp->props_modified(): Are properties modified, a "SVN::Tristate" enum, may be $SVN::Tristate::unknown.

svn_node_kind_t - SVN::Node

An enum of the following constants:

$SVN::Node::none, $SVN::Node::file, $SVN::Node::dir, $SVN::Node::unknown.

svn_tristate_t - SVN::Tristate

An enum of the following constants:

$SVN::Tristate::true, $SVN::Tristate::false, $SVN::Tristate::unknown

Note that these true/false values have nothing to do with Perl's concept of truth. In fact, each constant would evaluate to true in a boolean context.

svn_depth_t - SVN::Depth

An enum of the following constants:

$SVN::Depth::unknown: Depth undetermined or ignored. In some contexts, this means the client should choose an appropriate default depth. The server will generally treat it as $SVN::Depth::infinity.
$SVN::Depth::exclude: Exclude (i.e., don't descend into) directory D.
Note: In Subversion 1.5, $SVN::Depth::exclude is not supported anyhwere in the client-side (Wc/Client/etc) code; it is only supported as an argument to set_path functions in the Ra and Repos reporters. (This will enable future versions of Subversion to run updates, etc, against 1.5 servers with proper $SVN::Depth::exclude behavior, once we get a chance to implement client side support for $SVN::Depth::exclude).
$SVN::Depth::empty: Just the named directory D, no entries.
Updates will not pull in any files or subdirectories not already present.
$SVN::Depth::files: D + its files children, but not subdirs.
Updates will pull in any files not already present, but not subdirectories.
$SVN::Depth::immediates: D + immediate children (D and its entries).
Updates will pull in any files or subdirectories not already present; those subdirectories' this_dir entries will have depth-empty.
$SVN::Depth::infinity: D + all descendants (full recursion from D).
Updates will pull in any files or subdirectories not already present; those subdirectories' this_dir entries will have depth-infinity. Equivalent to the pre 1.5 default update behavior.

svn_opt_revision_t

A revision, specified in one of "SVN::Core::opt_revision_*" ways.

$rev->kind(): An enum denoting how the revision $rev was specified. One of $SVN::Core::opt_revision_unspecified, $SVN::Core::opt_revision_number, $SVN::Core::opt_revision_date, $SVN::Core::opt_revision_committed, $SVN::Core::opt_revision_previous, $SVN::Core::opt_revision_base, $SVN::Core::opt_revision_working or $SVN::Core::opt_revision_head.
$rev->value(): Extra data about the revision. Only relevant if "$rev->kind" is $SVN::Core::opt_revision_number (where it contains the revision number) or $SVN::Core::opt_revision_date (where it contains a date).

svn_opt_revision_range_t

An object representing a range of revisions.

$range->start(): The first revision in the range, a "_p_svn_opt_revision_t" object.
$range->end(): The last revision in the range, a "_p_svn_opt_revision_t" object.

svn_config_t

Opaque object describing a set of configuration options.

svn_dirent_t

$dirent->kind(): Node kind. A number which matches one of these constants: $SVN::Node::none, $SVN::Node::file, $SVN::Node::dir, $SVN::Node::unknown.
$dirent->size(): Length of file text, or 0 for directories.
$dirent->has_props(): Does the node have properties?
$dirent->created_rev(): Last revision in which this node changed.
$dirent->time(): Time of created_rev (mod-time).
$dirent->last_author(): Author of created rev.

svn_commit_info_t

$commit->revision(): Just committed revision.
$commit->date(): Server-side date of the commit.
$commit->author(): Author of the commit.
$commit->post_commit_err(): Error message from the post-commit hook, or undef.
$commit->repos_root(): Repository root, may be "undef" if unknown.

svn_log_entry_t

$entry->revision(): The revision of the commit.
$entry->revprops(): A reference to a hash of requested revision properties, which may be "undef" if it would contain no revprops.
$entry->has_children(): Whether or not this message has children.
$entry->changed_paths2(): A reference to hash containing as keys every path committed in "$entry->revision()"; the values are "_p_svn_log_changed_path2_t" objects.
$entry->non_inheritable(): Whether "$entry->revision()" should be interpreted as non-inheritable in the same sense of "_p_svn_merge_range_t".
$entry->subtractive_merge(): Whether "$entry->revision()" is a merged revision resulting from a reverse merge.

svn_auth_cred_simple_t

$simple->username(): Username.
$simple->password(): Password.
$simple->may_save(): Indicates if the credentials may be saved (to disk).

svn_auth_cred_username_t

$username->username(): Username.
$username->may_save(): Indicates if the credentials may be saved (to disk).

svn_auth_cred_ssl_server_trust_t

$strust->may_save(): Indicates if the credentials may be saved (to disk).
$strust->accepted_failures(): Bit mask of the accepted failures.

svn_auth_ssl_server_cert_info_t

$scert->hostname(): Primary CN.
$scert->fingerprint(): ASCII fingerprint.
$scert->valid_from(): ASCII date from which the certificate is valid.
$scert->valid_until(): ASCII date until which the certificate is valid.
$scert->issuer_dname(): DN of the certificate issuer.
$scert->ascii_cert(): Base-64 encoded DER certificate representation.

svn_auth_cred_ssl_client_cert_t

$ccert->cert_file(): Full paths to the certificate file.
$ccert->may_save(): Indicates if the credentials may be saved (to disk).

svn_auth_cred_ssl_client_cert_pw_t

$ccertpw->password(): Certificate password.
$ccertpw->may_save(): Indicates if the credentials may be saved (to disk).

CONSTANTS

SVN::Auth::SSL

$SVN::Auth::SSL::NOTYETVALID: Certificate is not yet valid.
$SVN::Auth::SSL::EXPIRED: Certificate has expired.
$SVN::Auth::SSL::CNMISMATCH: Certificate's CN (hostname) does not match the remote hostname.
$SVN::Auth::SSL::UNKNOWNCA: Certificate authority is unknown (i.e. not trusted).
$SVN::Auth::SSL::OTHER: Other failure. This can happen if some unknown error condition occurs.

_p_svn_lock_t

Objects of this class contain information about locks placed on files in a repository. It has the following accessor methods:

path: The full path to the file which is locked, starting with a forward slash ("/").
token: A string containing the lock token, which is a unique URI.
owner: The username of whoever owns the lock.
comment: A comment associated with the lock, or undef if there isn't one.
is_dav_comment: True if the comment was made by a generic DAV client.
creation_date: Time at which the lock was created, as the number of microseconds since 00:00:00 January 1, 1970 UTC. Divide it by 1_000_000 to get a Unix time_t value.
expiration_date: When the lock will expire. Has the value '0' if the lock will never expire.

AUTHORS

Chia-liang Kao <clkao@clkao.org>

COPYRIGHT

    Licensed to the Apache Software Foundation (ASF) under one
    or more contributor license agreements.  See the NOTICE file
    distributed with this work for additional information
    regarding copyright ownership.  The ASF licenses this file
    to you under the Apache License, Version 2.0 (the
    "License"); you may not use this file except in compliance
    with the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing,
    software distributed under the License is distributed on an
    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    KIND, either express or implied.  See the License for the
    specific language governing permissions and limitations
    under the License.