xbps/include/xbps_api.h

/*-
 * Copyright (c) 2008-2011 Juan Romero Pardines.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *-
 */

#ifndef _XBPS_API_H_
#define _XBPS_API_H_

#include <stdio.h>
#include <inttypes.h>

#include <archive.h>
#include <archive_entry.h>
#include <prop/proplib.h>

#ifdef  __cplusplus
# define __BEGIN_DECLS  extern "C" {
# define __END_DECLS    }
#else
# define __BEGIN_DECLS
# define __END_DECLS
#endif

/**
 * @file include/xbps_api.h
 * @brief XBPS Library API header
 *
 * This header documents the full API for the XBPS Library.
 */

/**
 * @def XBPS_RELVER
 * Current library release date.
 */
#define XBPS_RELVER		"20110225"

/** 
 * @def XBPS_META_PATH
 * Default root PATH to store metadata info.
 */
#define XBPS_META_PATH		"/var/db/xbps"

/** 
 * @def XBPS_CACHE_PATH
 * Default cache PATH to store downloaded binpkgs.
 */
#define XBPS_CACHE_PATH		"/var/cache/xbps"

/**
 * @def XBPS_REPOLIST
 * Filename for the global repository property list.
 */
#define XBPS_REPOLIST		"repositories.plist"

/** 
 * @def XBPS_REGPKGDB
 * Filename for the global package register database.
 */
#define XBPS_REGPKGDB		"regpkgdb.plist"

/** 
 * @def XBPS_PKGPROPS
 * Filename for package metadata property list.
 */
#define XBPS_PKGPROPS		"props.plist"

/**
 * @def XBPS_PKGFILES
 * Filename for package metadata files property list.
 */
#define XBPS_PKGFILES		"files.plist"

/** 
 * @def XBPS_PKGINDEX
 * Filename for the repository package index property list.
 */
#define XBPS_PKGINDEX		"pkg-index.plist"

/**
 * @def XBPS_PKGINDEX_VERSION
 * Current version for the repository package index format.
 */
#define XBPS_PKGINDEX_VERSION	"1.1"

/**
 * @def XBPS_FLAG_VERBOSE
 * Verbose flag used in xbps_unpack_binary_pkg() (for now).
 * Must be set through the xbps_init::flags member.
 */
#define XBPS_FLAG_VERBOSE	0x00000001

/**
 * @def XBPS_FLAG_FORCE
 * Force flag used in xbps_configure_pkg() (for now).
 * Must be set through the xbps_init::flags member.
 */
#define XBPS_FLAG_FORCE		0x00000002

__BEGIN_DECLS

void		xbps_printf(const char *, ...);
void		xbps_dbg_printf(const char *, ...);
void		xbps_dbg_printf_append(const char *, ...);
void		xbps_error_printf(const char *, ...);
void		xbps_warn_printf(const char *, ...);

/** @addtogroup initend */ 
/*@{*/

/**
 * @struct xbps_handle xbps_api.h "xbps_api.h"
 * @brief Generic XBPS structure handler for initialization.
 *
 * This structure sets some global properties for libxbps, to set some
 * function callbacks and data to the fetch and unpack functions,
 * the root and cache directory, flags, etc.
 */
struct xbps_handle {
	/**
	 * @var xbps_unpack_cb
	 *
	 * Pointer to the supplied function callback to be used in
	 * xbps_unpack_binary_pkg().
	 */
	void (*xbps_unpack_cb)(void *);
	/**
	 * @var xupd
	 *
	 * Pointer to a xbps_unpack_progress_data structure to be passed
	 * as argument to the \a xbps_unpack_cb function callback.
	 */
	struct xbps_unpack_progress_data *xupd;
	/**
	 * @var xbps_fetch_cb
	 *
	 * Pointer to the supplied function callback to be used in
	 * xbps_fetch_file().
	 */
	void (*xbps_fetch_cb)(void *);
	/**
	 * @var xfpd
	 *
	 * Pointer to a xbps_fetch_progress_data structure to be passed
	 * as argument to the \a xbps_fetch_cb function callback.
	 */
	struct xbps_fetch_progress_data *xfpd;
	/**
	 * @var flags
	 *
	 * Flags to be set globally, possible values:
	 * 	- XBPS_FLAG_VERBOSE
	 * 	- XBPS_FLAG_FORCE
	 */
	int flags;
	/**
	 * @var rootdir
	 *
	 * Root directory for all operations in XBPS. If NULL,
	 * by default it's set to /.
	 */
	const char *rootdir;
	/**
	 * @var cachedir
	 *
	 * Cache directory to store downloaded binary packages.
	 * If NULL default value in \a XBPS_CACHE_PATH is used.
	 */
	const char *cachedir;
	/**
	 * @var with_debug
	 *
	 * Set to true to enable debugging messages to stderr.
	 */
	bool with_debug;
	/**
	 * @var install_reason_auto
	 *
	 * Set to true to make installed or updated target package
	 * (and its dependencies) marked with automatic installation,
	 * thus it will be found as orphan if no packages are depending
	 * on it.
	 */
	bool install_reason_auto;
	/**
	 * @var install_reason_manual
	 *
	 * Set to true to make installed or updated target package
	 * (and its dependencies) marked with manual installation, thus
	 * it will never will be found as orphan.
	 */
	bool install_reason_manual;
};

/**
 * Initialize the XBPS library with the following steps:
 *
 *   - Set function callbacks for fetching and unpacking.
 *   - Set root directory.
 *   - Set cache directory.
 *   - Set global flags.
 *   - Set default cache connections for libfetch.
 *   - Initialize the debug printfs.
 *
 * @param[in] xh Pointer to an xbps_handle structure. It's
 * assumed that this pointer is not NULL.
 */
void xbps_init(struct xbps_handle *xh);

/**
 * Releases all resources used by the XBPS library.
 */
void xbps_end(void);

/**
 * Returns a pointer to the xbps_handle structure set by xbps_init().
 */
const struct xbps_handle *xbps_handle_get(void);

/*@}*/

/** @addtogroup configure */
/*@{*/

/**
 * Configure (or force reconfiguration of) a package.
 *
 * @param[in] pkgname Package name to configure.
 * @param[in] version Package version (<b>optional</b>).
 * @param[in] check_state Set it to true to check that package is
 * in unpacked state.
 * @param[in] update Set it to true if this package is being updated.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_configure_pkg(const char *pkgname,
		       const char *version,
		       bool check_state,
		       bool update);

/**
 * Configure (or force reconfiguration of) all packages.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_configure_all_pkgs(void);

/*@}*/

/** @addtogroup pkgprops */
/*@{*/

/**
 * Sets the property \a prop in a package matching the name \a pkgname.
 *
 * @param[in] prop Property key to be set.
 * @param[in] pkgname Package name to set the property.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_property_set(const char *prop, const char *pkgname);

/**
 * Unsets the property \a prop in a package matching the name \a pkgname.
 *
 * @param[in] prop Property key to be unset.
 * @param[in] pkgname Package name to unset the property.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_property_unset(const char *prop, const char *pkgname);

/*@}*/

/**
 * @ingroup vermatch
 *
 * Compares package version strings.
 *
 * The package version is defined by:
 * ${VERSION}[_${REVISION}][:${EPOCH}].
 *
 * ${EPOCH} supersedes ${VERSION} supersedes ${REVISION}.
 *
 * @param[in] pkg1 a package version string.
 * @param[in] pkg2 a package version string.
 *
 * @return -1, 0 or 1 depending if pkg1 is less than, equal to or
 * greater than pkg2.
 */
int xbps_cmpver(const char *pkg1, const char *pkg2);


/** @addtogroup download */
/*@{*/

/**
 * @struct xbps_fetch_progress_data xbps_api.h "xbps_api.h"
 * @brief Structure to be passed to the fetch progress function callback.
 *
 * This structure is passed as argument to the fetch progress function
 * callback and its members will be updated when there's any progress.
 * All members marked as read-only in this struct are set internally by
 * xbps_unpack_binary_pkg() and shouldn't be modified in the passed
 * function callback.
 */
struct xbps_fetch_progress_data {
	/**
	 * @var file_size
	 *
	 * Filename size for the file to be fetched (set internally,
	 * read only).
	 */
	off_t file_size;
	/**
	 * @var file_offset
	 *
	 * Current offset for the filename being fetched (set internally,
	 * read only).
	 */
	off_t file_offset;
	/**
	 * @var file_dloaded
	 *
	 * Bytes downloaded for the file being fetched (set internally).
	 */
	off_t file_dloaded;
	/**
	 * @var file_name
	 *
	 * File name being fetched (set internally, read only).
	 */
	const char *file_name;
	/**
	 * @var cb_start
	 *
	 * If true the function callback should be prepared to start
	 * the transfer progress (set internally, read only).
	 */
	bool cb_start;
	/**
	 * var cb_update
	 *
	 * If true the function callback should be prepared to
	 * update the transfer progress (set internally, read only).
	 */
	bool cb_update;
	/**
	 * var cb_end
	 *
	 * If true the function callback should be prepated to
	 * end the transfer progress (set internally, read only).
	 */
	bool cb_end;
	/**
	 * @var cookie
	 *
	 * Pointer to private user data.
	 */
	void *cookie;
};

/**
 * Download a file from a remote URL.
 * 
 * @param[in] uri Remote URI string.
 * @param[in] outputdir Directory string to store downloaded file.
 * @param[in] refetch If true and local/remote size/mtime do not match,
 * fetch the file from scratch.
 * @param[in] flags Flags passed to libfetch's fetchXget().
 * 
 * @return -1 on error, 0 if not downloaded (because local/remote size/mtime
 * do not match) and 1 if downloaded successfully.
 **/
int xbps_fetch_file(const char *uri,
		    const char *outputdir,
		    bool refetch,
		    const char *flags);

/**
 * Returns last error string reported by xbps_fetch_file().
 *
 * @return A string with the appropiate error message.
 */
const char *xbps_fetch_error_string(void);

/*@}*/

/**
 * @ingroup pkg_orphans
 *
 * Finds all package orphans currently installed.
 *
 * @param[in] orphans Proplib array of strings with package names of
 * packages that should be treated as they were already removed (optional).
 *
 * @return A proplib array of dictionaries with all orphans found,
 * on error NULL is returned and errno is set appropiately.
 */
prop_array_t xbps_find_pkg_orphans(prop_array_t orphans);

/**
 * @ingroup vermatch
 *
 * Package pattern matching.
 *
 * @param[in] instpkg Package/version string of an installed package.
 * @param[in] pattern Pattern required for \a instpkg to match.
 *
 * @return 1 if \a instpkg is matched against \a pattern, 0 if no match.
 */
int xbps_pkgpattern_match(const char *instpkg, char *pattern);

/** @addtogroup plist */
/*@{*/

/**
 * Adds a proplib object into a proplib dictionary with specified key.
 *
 * @param[in] dict Proplib dictionary to insert the object to.
 * @param[in] obj Proplib object to be inserted.
 * @param[in] key Key associated with \a obj.
 *
 * @return true on success, false otherwise and errno set appropiately.
 */
bool xbps_add_obj_to_dict(prop_dictionary_t dict,
			  prop_object_t obj,
			  const char *key);

/**
 * Adds a proplib object into a proplib array.
 *
 * @param[in] array Proplib array to insert the object to.
 * @param[in] obj Proplib object to be inserted.
 * 
 * @return true on success, false otherwise and xbps_errno set appropiately.
 */
bool xbps_add_obj_to_array(prop_array_t array, prop_object_t obj);

/**
 * Executes a function callback specified in \a fn with \a arg paassed
 * as its argument into they array \a array.
 *
 * @param[in] array Proplib array to iterate.
 * @param[in] fn Function callback to run on every object in the array.
 * While running the function callback, the hird parameter (a pointer to
 * a boolean) can be set to true to stop immediately the loop.
 * @param[in] arg Argument to be passed to the function callback.
 *
 * @return 0 on success, otherwise an errno value is set appropiately.
 */
int xbps_callback_array_iter(prop_array_t array,
			     int (*fn)(prop_object_t, void *, bool *),
			     void *arg);

/**
 * Executes a function callback into the array associated with key \a key,
 * contained in a proplib dictionary.
 *
 * @param[in] dict Proplib dictionary where the array resides.
 * @param[in] key Key associated with array.
 * @param[in] fn Function callback to run on every
 * object in the array. While running the function callback, the third
 * parameter (a pointer to a boolean) can be set to true to stop
 * immediately the loop.
 * @param[in] arg Argument to be passed to the function callback.
 *
 * @return 0 on success (all objects were processed), otherwise an
 * errno value is set appropiately.
 */
int xbps_callback_array_iter_in_dict(prop_dictionary_t dict,
			const char *key,
			int (*fn)(prop_object_t, void *, bool *),
			void *arg);

/**
 * Executes a function callback (in reverse order) into the array
 * associated with key \a key, contained in a proplib dictionary.
 *
 * @param[in] dict Proplib dictionary where the array resides.
 * @param[in] key Key associated with array.
 * @param[in] fn Function callback to run on every
 * object in the array. While running the function callback, the third
 * parameter (a pointer to a boolean) can be set to true to stop
 * immediately the loop.
 * @param[in] arg Argument to be passed to the function callback.
 *
 * @return 0 on success (all objects were processed), otherwise an
 * errno value is set appropiately.
 */
int xbps_callback_array_iter_reverse_in_dict(prop_dictionary_t dict,
			const char *key,
			int (*fn)(prop_object_t, void *, bool *),
			void *arg);

/**
 * Finds the proplib's dictionary associated with a package, by looking
 * it via its name in a proplib dictionary.
 *
 * @param[in] dict Proplib dictionary to look for the package dictionary.
 * @param[in] key Key associated with the array that stores package's dictionary.
 * @param[in] pkgname Package name to look for.
 *
 * @return The package's proplib dictionary on success, NULL otherwise and
 * errno is set appropiately.
 */
prop_dictionary_t xbps_find_pkg_in_dict_by_name(prop_dictionary_t dict,
						const char *key,
						const char *pkgname);

/**
 * Finds the proplib's dictionary associated with a package, by looking
 * at it via a package pattern in a proplib dictionary.
 *
 * @param[in] dict Proplib dictionary to look for the package dictionary.
 * @param[in] key Key associated with the array storing the package's dictionary.
 * @param[in] pattern Package pattern to match.
 *
 * @return The package's proplib dictionary on success, NULL otherwise
 * and errno is set appropiately.
 */
prop_dictionary_t xbps_find_pkg_in_dict_by_pattern(prop_dictionary_t dict,
						   const char *key,
						   const char *pattern);

/**
 * Finds the package's proplib dictionary in a plist file by specifying
 * a package name.
 *
 * @param[in] plist Path to a plist file.
 * @param[in] key Proplib array's key name.
 * @param[in] pkgname Package name to match in array.
 *
 * @return The package's proplib dictionary on success, NULL otherwise and
 * errno is set appropiately. Returned dictionary is copied via
 * prop_dictionary_copy(), which means that caller is responsible to
 * release the object with prop_object_release() when done.
 */
prop_dictionary_t xbps_find_pkg_dict_from_plist_by_name(const char *plist,
							const char *key,
							const char *pkgname);

/**
 * Finds the package's proplib dictionary in a plist file by specifying
 * a package pattern.
 *
 * @param[in] plist Path to a plist file.
 * @param[in] key Proplib array's key name.
 * @param[in] pattern Package pattern to match in array.
 *
 * @return The package's proplib dictionary on success, NULL otherwise and
 * errno is set appropiately. Returned dictionary should be released with
 * prop_object_release() when it's not any longer needed.
 */
prop_dictionary_t xbps_find_pkg_dict_from_plist_by_pattern(const char *plist,
							   const char *key,
							   const char *pattern);

/**
 * Finds a package's dictionary searching in the registered packages
 * database by using a package name or a package pattern.
 *
 * @param[in] str Package name or package pattern.
 * @param[in] bypattern Set it to true to find the package dictionary
 * by using a package pattern. If false, \a str is assumed to be a package name.
 *
 * @return The package's dictionary on success, NULL otherwise and
 * errno is set appropiately. Returned dictionary is copied via
 * prop_dictionary_copy(), which means that caller is responsible to
 * release the object with prop_object_release() when done.
 */
prop_dictionary_t xbps_find_pkg_dict_installed(const char *str,
					       bool bypattern);

/**
 * Finds a virtual package by looking at package's dictionary by
 * using a package name or a package pattern.
 *
 * @param[in] pkgd Package dictionary.
 * @param[in] str Virtual package name or package pattern.
 * @param[in] bypattern If true, \a str should be a package name,
 * otherwise it should be a package pattern.
 *
 * @return True if package dictionary matches the virtual package
 * name or pattern, false otherwise.
 */
bool xbps_find_virtual_pkg_in_dict(prop_dictionary_t pkgd,
				   const char *str,
				   bool bypattern);

/**
 * Finds a package dictionary in a proplib array by matching a package name.
 *
 * @param[in] array The proplib array where to look for.
 * @param[in] name The package name to match.
 *
 * @return true on success, false otherwise and errno is set appropiately.
 */
prop_dictionary_t xbps_find_pkg_in_array_by_name(prop_array_t array,
						 const char *name);

/**
 * Finds a package dictionary in a proplib array by matching a package pattern.
 *
 * @param[in] array The proplib array where to look for.
 * @param[in] pattern The package pattern to match.
 *
 * @return true on success, false otherwise and errno is set appropiately.
 */
prop_dictionary_t xbps_find_pkg_in_array_by_pattern(prop_array_t array,
						    const char *pattern);

/**
 * Finds a package name matching an string object in a proplib array.
 *
 * @param[in] array The proplib array where to look for.
 * @param[in] pkgname The package name to match.
 *
 * @return true on success, false otherwise and errno is set appropiately.
 */
bool xbps_find_pkgname_in_array(prop_array_t array, const char *pkgname);

/**
 * Finds a package pattern matching an string object in a proplib array.
 *
 * @param[in] array The proplib array where to look for.
 * @param[in] pattern The package pattern to match.
 *
 * @return true on success, false otherwise and errno is set appropiately.
 */
bool xbps_find_pkgpattern_in_array(prop_array_t array, const char *pattern);

/**
 * Finds a string matching an object in a proplib array.
 *
 * @param[in] array The proplib array where to look for.
 * @param[in] val The value of string to match.
 *
 * @return true on success, false otherwise and errno is set appropiately.
 */
bool xbps_find_string_in_array(prop_array_t array, const char *val);

/**
 * Gets a proplib object iterator associated with an array, contained
 * in a proplib dictionary matching a key.
 *
 * @param[in] dict Proplib dictionary where to look for the array.
 * @param[in] key Key associated with the array.
 *
 * @return A proplib object iterator on success, NULL otherwise and
 * errno is set appropiately.
 */
prop_object_iterator_t xbps_get_array_iter_from_dict(prop_dictionary_t dict,
						     const char *key);

/**
 * Get a proplib object dictionary associated with the installed package
 * \a pkgn, by internalizing its plist file defined by \a plist.
 *
 * @param[in] pkgn Package name of installed package.
 * @param[in] plist Package metadata property list file.
 *
 * @return The proplib object dictionary on success, NULL otherwise and
 * errno is set appropiately.
 */
prop_dictionary_t xbps_get_pkg_dict_from_metadata_plist(const char *pkgn,
							const char *plist);

/**
 * Removes the package's proplib dictionary matching \a pkgname
 * in a plist file.
 *
 * @param[in] name Package name to match in plist's dictionary.
 * @param[in] plist Path to a plist file.
 *
 * @return true on success, false otherwise and errno is set appropiately.
 */
bool xbps_remove_pkg_dict_from_plist_by_name(const char *name,
					     const char *plist);

/**
 * Removes the package's proplib dictionary matching \a pkgname
 * in a proplib array.
 *
 * @param[in] array Proplib array where to look for.
 * @param[in] name Package name to match in the array.
 *
 * @return true on success, false otherwise and errno is set appropiately.
 */
bool xbps_remove_pkg_from_array_by_name(prop_array_t array, const char *name);

/**
 * Removes the package's proplib dictionary matching \a pkgname,
 * in an array with key \a key stored in a proplib dictionary.
 *
 * @param[in] dict Proplib dictionary storing the proplib array.
 * @param[in] key Key associated with the proplib array.
 * @param[in] name Package name to look for.
 *
 * @return true on success, false otherwise and errno is set appropiately.
 */
bool xbps_remove_pkg_from_dict_by_name(prop_dictionary_t dict,
				       const char *key,
				       const char *name);

/**
 * Removes a string from a proplib's array.
 *
 * @param[in] array Proplib array where to look for.
 * @param[in] str String to match in the array.
 *
 * @return true on success, false otherwise and errno is set appropiately.
 */
bool xbps_remove_string_from_array(prop_array_t array, const char *str);

/**
 * Removes a string from a proplib's array matched by a package name.
 *
 * @param[in] array Proplib array where to look for.
 * @param[in] name Package name to match.
 *
 * @return true on success, false otherwise and errno is set appropiately.
 */
bool xbps_remove_pkgname_from_array(prop_array_t array, const char *name);

/*@}*/

/** @addtogroup purge */
/*@{*/

/**
 * Purge an installed package.
 *
 * @param[in] pkgname Package name to match.
 * @param[in] check_state Set it to true to check that package
 * is in XBPS_PKG_STATE_CONFIG_FILES state.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_purge_pkg(const char *pkgname, bool check_state);

/**
 * Purge all installed packages. Packages that aren't in
 * XBPS_PKG_STATE_CONFIG_FILES state will be ignored.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_purge_all_pkgs(void);

/*@}*/

/** @addtogroup pkg_register */
/*@{*/

/**
 * Register a package into the installed packages database.
 *
 * @param[in] pkg_dict A dictionary with the following objects:
 * \a pkgname, \a version, \a pkgver, \a short_desc (string)
 * and optionally \a provides (array of strings).
 * @param[in] automatic Set it to true to mark package that has been
 * installed by another package, and not explicitly.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_register_pkg(prop_dictionary_t pkg_dict, bool automatic);

/**
 * Unregister a package from the package database.
 *
 * @param[in] pkgname Package name.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_unregister_pkg(const char *pkgname);

/*@}*/

/** @addtogroup regpkgdb */
/*@{*/

/**
 * Initialize resources used by the registered packages database dictionary
 * and returns the internalized proplib dictionary.
 *
 * @note This function is reference counted, if the database has
 * been initialized previously, the counter will be increased by one
 * and dictionary stored in memory will be returned.
 *
 * @warning Don't forget to always use xbps_regpkgdb_dictionary_release()
 * when its dictionary is no longer needed.
 *
 * @return A dictionary as shown above in the Detailed description
 * graph on success, or NULL otherwise and errno is set appropiately.
 */
prop_dictionary_t xbps_regpkgdb_dictionary_get(void);

/**
 * Release resources used by the registered packages database.
 *
 * @note This function is reference counted, if the database
 * is in use (its reference count number is greater than 1), won't be released.
 */ 
void xbps_regpkgdb_dictionary_release(void);

/*@}*/

/** @addtogroup pkg_remove */
/*@{*/

/**
 * Remove an installed package.
 *
 * @param[in] pkgname Package name to match.
 * @param[in] version Package version associated.
 * @param[in] update If true, some steps will be skipped. See in the
 * detailed description above for more information.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_remove_pkg(const char *pkgname, const char *version, bool update);

/**
 * Remove files defined in a proplib array as specified by \a key
 * of an installed package.
 * 
 * @param[in] dict Proplib dictionary internalized from package's
 * <b>XBPS_PKGFILES</b> definition in package's metadata directory.
 * The image in Detailed description shows off its structure.
 * @param[in] key Key of the array object to match, valid values are:
 * <b>files</b>, <b>dirs</b>, <b>links</b> and <b>conf_files</b>.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_remove_pkg_files(prop_dictionary_t dict, const char *key);

/*@}*/

/** @addtogroup repo_register */
/*@{*/

/**
 * Registers a repository into the database.
 *
 * @param[in] uri URI pointing to the repository.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_repository_register(const char *uri);

/**
 * Unregisters a repository from the database.
 *
 * @param[in] uri URI pointing to the repository.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_repository_unregister(const char *uri);

/*@}*/

/** @addtogroup repo_pkgs */
/*@{*/

/**
 * Finds a package by a pattern and enqueues it into
 * the transaction dictionary for future use. The first repository in
 * the pool that matched the pattern wins.
 *
 * @note The function name might be misleading, but is correct because
 * if package is found, it will be marked as "going to be installed".
 *
 * @param pkgpattern Package name or pattern to find.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_repository_install_pkg(const char *pkgpattern);

/**
 * Marks a package as "going to be updated" in the transaction dictionary.
 * All repositories in the pool will be used, and if a newer version
 * is available the package dictionary will be enqueued.
 *
 * @param pkgname The package name to update.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_repository_update_pkg(const char *pkgname);

/**
 * Finds newer versions for all installed packages by looking at the
 * repository pool. If a newer version exists, package will be enqueued
 * into the transaction dictionary.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_repository_update_allpkgs(void);

/*@}*/

/** @addtogroup transdict */
/*@{*/

/**
 * Returns the transaction dictionary, as shown above in the image.
 * Before returning the package list is sorted in the correct order
 * and total installed/download size for the transaction is computed.
 *
 * @return The proplib transaction dictionary on success, otherwise NULL
 * and errno is set appropiately. ENXIO if the transaction
 * dictionary and the missing deps array were not created. ENODEV if
 * there are missing dependencies or any other if there was an error
 * while sorting packages or computing the transaction size.
 *
 * @note
 *  - This function will set errno to ENXIO if xbps_repository_install_pkg()
 *    xbps_repository_update_pkg() functions were not called previously.
 */
prop_dictionary_t xbps_transaction_prepare(void);

/**
 * Returns the missing deps array if xbps_repository_install_pkg()
 * or xbps_repository_update_pkg() failed to find required packages
 * in registered repositories.
 *
 * @return The proplib array, NULL if it couldn't be created.
 */
prop_array_t xbps_transaction_missingdeps_get(void);

/*@}*/

/** @addtogroup repo_plist */
/*@{*/

/**
 * Iterate over the the repository pool and search for a plist file
 * in the binary package named 'pkgname'. The plist file will be
 * internalized to a proplib dictionary.
 *
 * The first repository that has it wins and the loop is stopped.
 * This will work locally and remotely, thanks to libarchive and
 * libfetch!
 *
 * @param[in] pkgname Package name to match.
 * @param[in] plistf Plist file name to match.
 *
 * @return An internalized proplib dictionary, otherwise NULL and
 * errno is set appropiately.
 *
 * @note if NULL is returned and errno is ENOENT, that means that
 * binary package file has been found but the plist file could not
 * be found.
 */
prop_dictionary_t xbps_repository_plist_find_pkg_dict(const char *pkgname,
						      const char *plistf);

/**
 * Finds a plist file in a binary package file stored local or
 * remotely as specified in the URL.
 *
 * @param[in] url URL to binary package file.
 * @param[in] plistf Plist file name to match.
 *
 * @return An internalized proplib dictionary, otherwise NULL and
 * errno is set appropiately.
 */
prop_dictionary_t
	xbps_repository_plist_find_pkg_dict_from_url(const char *url,
						     const char *plistf);

/*@}*/

/** @addtogroup repopool */
/*@{*/

/**
 * @struct repository_pool_index xbps_api.h "xbps_api.h"
 * @brief Repository pool dictionary structure
 *
 * Repository index object structure registered in a private simple queue.
 * The structure contains a dictionary and the URI associated with the
 * registered repository index.
 */
struct repository_pool_index {
	/**
	 * @var rpi_repod
	 * 
	 * Internalized Proplib dictionary of the pkg-index plist file
	 * associated with repository.
	 */
	prop_dictionary_t rpi_repod;
	/**
	 * @var rpi_uri
	 * 
	 * URI string associated with repository.
	 */
	char *rpi_uri;
};

/**
 * Initializes the repository pool.
 *
 * Once it's initialized, access to the repositories can be done
 * through the \a xbps_repository_pool_foreach() and
 * \a xbps_repository_pool_find_pkg() functions.
 *
 * @note This function is reference counted, don't forget to call
 * xbps_repository_pool_release() when it's no longer needed.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_repository_pool_init(void);

/**
 * Releases the repository pool with all registered repositories
 * in the database.
 *
 * @note This function is reference counted, it won't be released until
 * its reference counter is 1.
 */
void xbps_repository_pool_release(void);

/**
 * Iterates over the repository pool and executes the \a fn function
 * callback passing in the void * \a arg argument to it. The bool pointer
 * argument can be used in the callbacks to stop immediately the loop if
 * set to true, otherwise it will only be stopped if it returns a
 * non-zero value.
 *
 * @param[in] fn Function callback to execute for every repository registered in
 * the pool.
 * @param[in] arg Opaque data passed in to the \a fn function callback for
 * client data.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_repository_pool_foreach(
		int (*fn)(struct repository_pool_index *, void *, bool *),
		void *arg);

/**
 * Finds a package dictionary in the repository pool by specifying a
 * package pattern or a package name.
 *
 * @param[in] pkg Package pattern or name.
 * @param[in] bypattern True if \a pkg is a pattern, false if it is a pkgname.
 * @param[in] best True to find the best version available in repo, false to
 * fetch the first package found matching its pkgname.
 *
 * @return The package dictionary if found, NULL otherwise.
 */
prop_dictionary_t
	xbps_repository_pool_find_pkg(const char *pkg, bool bypattern, bool best);

/*@}*/

/** @addtogroup reposync */
/*@{*/

/**
 * Syncs the package index file for a remote repository as specified
 * by the \a uri argument (if necessary).
 *
 * @param[in] uri URI to a remote repository.
 *
 * @return -1 on error (errno is set appropiately), 0 if transfer was
 * not necessary (local/remote size/mtime matched) or 1 if
 * downloaded successfully.
 */
int xbps_repository_sync_pkg_index(const char *uri);

/*@}*/

/** @addtogroup pkgstates */
/*@{*/

/**
 * @enum pkg_state_t
 *
 * Integer representing a state on which a package may be. Possible
 * values for this are:
 *
 * <b>XBPS_PKG_STATE_UNPACKED</b>: Package has been unpacked correctly
 * but has not been configured due to unknown reasons.
 *
 * <b>XBPS_PKG_STATE_INSTALLED</b>: Package has been installed successfully.
 *
 * <b>XBPS_PKG_STATE_BROKEN</b>: not yet used.
 *
 * <b>XBPS_PKG_STATE_CONFIG_FILES</b>: Package has been removed but not
 * yet purged.
 *
 * <b>XBPS_PKG_STATE_NOT_INSTALLED</b>: Package going to be installed in
 * a transaction dictionary but that has not been yet unpacked.
 */
typedef enum pkg_state {
	XBPS_PKG_STATE_UNPACKED = 1,
	XBPS_PKG_STATE_INSTALLED,
	XBPS_PKG_STATE_BROKEN,
	XBPS_PKG_STATE_CONFIG_FILES,
	XBPS_PKG_STATE_NOT_INSTALLED
} pkg_state_t;

/**
 * Gets package state from package \a pkgname, and sets its state
 * into \a state.
 * 
 * @param[in] pkgname Package name.
 * @param[out] state Package state returned.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_get_pkg_state_installed(const char *pkgname, pkg_state_t *state);

/**
 * Gets package state from a package dictionary \a dict, and sets its
 * state into \a state.
 *
 * @param[in] dict Package dictionary.
 * @param[out] state Package state returned.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_get_pkg_state_dictionary(prop_dictionary_t dict, pkg_state_t *state);

/**
 * Sets package state \a state in package \a pkgname.
 *
 * @param[in] pkgname Package name.
 * @param[in] version Package version (optional).
 * @param[in] pkgver Package name/version touple (optional).
 * @param[in] state Package state to be set.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_set_pkg_state_installed(const char *pkgname,
				 const char *version,
				 const char *pkgver,
				 pkg_state_t state);

/**
 * Sets package state \a state in package dictionary \a dict.
 *
 * @param[in] dict Package dictionary.
 * @param[in] state Package state to be set.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_set_pkg_state_dictionary(prop_dictionary_t dict, pkg_state_t state);

/*@}*/

/** @addtogroup unpack */
/*@{*/

/**
 * @struct xbps_unpack_progress_data xbps_api.h "xbps_api.h"
 * @brief Structure to be passed to the unpacking progress function callback.
 *
 * This structure is passed as argument to the unpack progress function
 * callback and its members will be updated when there's any progress.
 * All members in this struct are set internally by xbps_unpack_binary_pkg()
 * and should be used in read-only mode in the function callback.
 */
struct xbps_unpack_progress_data {
	/**
	 * @var entry
	 *
	 * Entry pathname string (set internally, read only).
	 */
	const char *entry;
	/**
	 * @var entry_size
	 *
	 * Entry file size (set internally, read only).
	 */
	int64_t entry_size;
	/**
	 * @var entry_extract_count
	 *
	 * Total number of extracted entries (set internally, read only).
	 */
	ssize_t entry_extract_count;
	/**
	 * @var entry_total_count
	 *
	 * Total number of entries in package (set internally, read only).
	 */
	ssize_t entry_total_count;
	/**
	 * @var entry_is_metadata
	 *
	 * If true "entry" is a package metadata file (set internally,
	 * read only).
	 */
	bool entry_is_metadata;
	/**
	 * @var entry_is_conf
	 *
	 * If true "entry" is a configuration file (set internally,
	 * read only).
	 */
	bool entry_is_conf;
};

/**
 * Unpacks a binary package into specified root directory.
 *
 * @param[in] trans_pkg_dict Package proplib dictionary as stored in the
 * \a packages array returned by the transaction dictionary.
 *
 * @return 0 on success, otherwise an errno value.
 */
int xbps_unpack_binary_pkg(prop_dictionary_t trans_pkg_dict);

/*@}*/

/** @addtogroup util */
/*@{*/

/**
 * Creates a directory (and required components if necessary).
 *
 * @param[in] path Path for final directory.
 * @param[in] mode Mode for final directory (0755 if not specified).
 *
 * @return 0 on success, -1 on error and errno set appropiately.
 */
int xbps_mkpath(const char *path, mode_t mode);

/**
 * Returns a string by concatenating its variable argument list
 * as specified by the format string \a fmt.
 *
 * @param[in] fmt Format string, see printf(3).
 * @return A pointer to a malloc(3)ed string, NULL otherwise and errno
 * is set appropiately. The pointer should be free(3)d when it's
 * no longer needed.
 */
char *xbps_xasprintf(const char *fmt, ...);

/**
 * Returns a string with the sha256 hash for the file specified
 * by \a file.
 *
 * @param[in] file Path to a file.
 * @return A pointer to a malloc(3)ed string, NULL otherwise and errno
 * is set appropiately. The pointer should be free(3)d when it's no
 * longer needed.
 */
char *xbps_get_file_hash(const char *file);

/**
 * Returns a string with the sha256 hash for the file specified
 * by \a file in an array with key \a key in the proplib dictionary
 * \a d.
 *
 * @param[in] d Proplib dictionary to look in.
 * @param[in] key Array key to match in dictionary.
 * @param[in] file Pathname to a file.
 *
 * @return The sha256 hash string if found, NULL otherwise
 * and errno is set appropiately.
 */
const char *xbps_get_file_hash_from_dict(prop_dictionary_t d,
					 const char *key,
					 const char *file);

/**
 * Compares the sha256 hash of the file \a file with the sha256
 * string specified by \a sha256.
 *
 * @param[in] file Path to a file.
 * @param[in] sha256 SHA256 hash to compare.
 *
 * @return 0 if \a file and \a sha256 have the same hash, ERANGE
 * if it differs, or any other errno value on error.
 */
int xbps_check_file_hash(const char *file, const char *sha256);

/**
 * Checks if a package is currently installed by matching a package
 * pattern string.
 *
 * @param[in] pkg Package pattern used to find the package.
 *
 * @return -1 on error (errno set appropiately), 0 if package pattern
 * didn't match installed package, 1 if \a pkg pattern fully
 * matched installed package.
 */
int xbps_check_is_installed_pkg_by_pattern(const char *pkg);

/**
 * Checks if package \a pkgname is currently installed.
 *
 * @param[in] pkgname Package name.
 *
 * @return True if \a pkgname is installed, false otherwise.
 */
bool xbps_check_is_installed_pkg_by_name(const char *pkgname);

/**
 * Checks if the URI specified by \a uri is remote or local.
 *
 * @param[in] uri URI string.
 * 
 * @return true if URI is remote, false if local.
 */
bool xbps_check_is_repository_uri_remote(const char *uri);

/**
 * Gets the full URI to a binary package file as returned by a
 * package dictionary from a repository in \a pkgd, by looking at the
 * repository location object "repository" in its dictionary.
 *
 * @param[in] pkgd Package dictionary stored in a transaction dictionary.
 * @param[in] repoloc Repository URL location string.
 *
 * @return A pointer to a malloc(3)ed string, NULL otherwise and
 * errno is set appropiately. The pointer should be free(3)d when it's
 * no longer needed.
 */ 
char *xbps_get_binpkg_repo_uri(prop_dictionary_t pkgd, const char *repoloc);

/**
 * Gets the full path to a repository package index plist file, as
 * specified by \a uri.
 *
 * @param[in] uri Repository URI.
 *
 * @return A pointer to a malloc(3)d string, NULL otherwise and
 * errno is set appropiately. The pointer should be free(3)d when it's
 * no longer needed.
 */
char *xbps_get_pkg_index_plist(const char *uri);

/**
 * Gets the name of a package string. Package strings are composed
 * by a @<pkgname@>/@<version@> pair and separated by the <em>minus</em>
 * sign, i.e <b>foo-2.0</b>.
 *
 * @param[in] pkg Package string.
 *
 * @return A pointer to a malloc(3)d string, NULL otherwise and
 * errno is set appropiately. The pointer should be free(3)d when it's
 * no longer needed.
 */
char *xbps_get_pkg_name(const char *pkg);

/**
 * Gets a the package name of a package pattern string specified by
 * the \a pattern argument.
 *
 * @param[in] pattern A package pattern. Package patterns are composed
 * by looking at <b>'><='</b> to split components, i.e <b>foo>=2.0</b>,
 * <b>blah<1.0</b>, <b>blob==2.0</b>, etc.
 *
 * @return A pointer to a malloc(3)ed string with the package name,
 * NULL otherwise and errno is set appropiately. The pointer should be
 * free(3)d when it's no longer needed.
 */
char *xbps_get_pkgpattern_name(const char *pattern);

/**
 * Gets the package epoch version in a package string, i.e <b>foo-2.0:epoch</b>.
 *
 * @param[in] pkg Package string.
 * 
 * @return A string with the epoch version string, NULL if it couldn't find
 * the epoch component.
 */
const char *xbps_get_pkg_epoch(const char *pkg);

/**
 * Gets the package version in a package string, i.e <b>foo-2.0</b>.
 * 
 * @param[in] pkg Package string.
 *
 * @return A string with the version string, NULL if it couldn't
 * find the version component.
 */
const char *xbps_get_pkg_version(const char *pkg);

/**
 * Gets the package version of a package pattern string specified by
 * the \a pattern argument.
 *
 * @param[in] pattern A package pattern. The same rules in
 * xbps_get_pkgpattern_name() apply here.
 *
 * @return A string with the pattern version, NULL otherwise and
 * errno is set appropiately.
 */
const char *xbps_get_pkgpattern_version(const char *pattern);

/**
 * Gets the package version revision in a package string.
 *
 * @param[in] pkg Package string, i.e <b>foo-2.0_1</b>.
 *
 * @return A string with the revision number, NULL if it couldn't
 * find the revision component.
 */
const char *xbps_get_pkg_revision(const char *pkg);

/**
 * Checks if a package has run dependencies.
 *
 * @param[in] dict Package dictionary.
 *
 * @return True if package has run dependencies, false otherwise.
 */
bool xbps_pkg_has_rundeps(prop_dictionary_t dict);

/**
 * Converts the 64 bits signed number specified in \a bytes to
 * a human parsable string buffer pointed to \a buf.
 *
 * @param[out] buf Buffer to store the resulting string. At least
 * it should have space for 6 chars.
 * @param[in] bytes 64 bits signed number to convert.
 *
 * @return A negative number is returned on error, 0 otherwise.
 */
int xbps_humanize_number(char *buf, int64_t bytes);

/*@}*/

__END_DECLS

#endif /* !_XBPS_API_H_ */