|
|
|
@ -15,7 +15,7 @@ only accessible in read-only mode, through some clearly defined functions.
|
|
|
|
|
In addition to "alpm.h", the interfaces of "alpm_list.h" have also been made
|
|
|
|
|
available to the frontend. It is not a requirement for the frontend to use
|
|
|
|
|
these list functions; however, it prevents frontends from having to reimplement
|
|
|
|
|
possibly useful functions.
|
|
|
|
|
a list data structure.
|
|
|
|
|
|
|
|
|
|
Several structures and functions have been renamed compared to pacman 2.9 code.
|
|
|
|
|
This was done at first for the sake of naming scheme consistency, and then
|
|
|
|
@ -25,53 +25,68 @@ same name declared in both spaces. To avoid such conflicts, internal function
|
|
|
|
|
names have been prepended with "_alpm_".
|
|
|
|
|
|
|
|
|
|
In a general manner, public library functions are named "alpm_<type>_<action>"
|
|
|
|
|
(examples: alpm_trans_commit(), alpm_lib_release(), alpm_pkg_getinfo(), ...).
|
|
|
|
|
(examples: alpm_trans_commit(), alpm_release(), alpm_pkg_getinfo(), ...).
|
|
|
|
|
Internal (and thus private) functions should be named "_alpm_XXX" for instance
|
|
|
|
|
(examples: _alpm_needbackup(), _alpm_runscriplet(), ...). Functions defined and
|
|
|
|
|
used inside a single file should be defined as "static".
|
|
|
|
|
|
|
|
|
|
NOTE: The below descriptions may be severely outdated. Yes it needs updating,
|
|
|
|
|
but it may be better done by doxygen comments and generated documentation.
|
|
|
|
|
|
|
|
|
|
[HANDLE] (see handle.c)
|
|
|
|
|
[Initialization]
|
|
|
|
|
|
|
|
|
|
The "handle" object is the heart of the library. It is a global
|
|
|
|
|
structure available from almost all other objects (althought some very
|
|
|
|
|
low level objects should not be aware of the handle object, like chained
|
|
|
|
|
list, package or groups structures.
|
|
|
|
|
alpm_init() is used to initialize library internals and to create
|
|
|
|
|
a transparent handle object. Before its call, the library can't be used.
|
|
|
|
|
|
|
|
|
|
There is only one instance, created by the frontend upon
|
|
|
|
|
"alpm_lib_init()" call, and destroyed upon "alpm_lib_release()" call.
|
|
|
|
|
|
|
|
|
|
alpm_lib_init() is used to initialize library internals and to create
|
|
|
|
|
the handle object (handle != NULL).
|
|
|
|
|
Before its call, the library can't be used.
|
|
|
|
|
alpm_lib_release() just does the opposite (memory used by the library is
|
|
|
|
|
freed, and handle is set to NULL).
|
|
|
|
|
After its call, the library is no more available.
|
|
|
|
|
|
|
|
|
|
The aim of the handle is to provide a central placeholder for essential
|
|
|
|
|
library parameters (filesystem root, pointers to database objects,
|
|
|
|
|
configuration parameters, ...)
|
|
|
|
|
|
|
|
|
|
The handle also allows to register a log callback usable by the frontend
|
|
|
|
|
to catch all sort of notifications from the library.
|
|
|
|
|
The frontend can choose the level of verbosity (i.e. the mask), or can
|
|
|
|
|
simply choose to not use the log callback.
|
|
|
|
|
A friendly frontend should care at least for WARNING and ERROR
|
|
|
|
|
notifications.
|
|
|
|
|
Other notifications can safely be ignored and are mainly available for
|
|
|
|
|
troubleshooting purpose.
|
|
|
|
|
|
|
|
|
|
Last, but not least, the handle holds a _unique_ transaction object.
|
|
|
|
|
alpm_lib_release() just does the opposite (memory used by the library, and the
|
|
|
|
|
handle is freed). After its call, the library is no longer available.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
[TRANSACTION] (see trans.c, and also alpm.c)
|
|
|
|
|
[Options]
|
|
|
|
|
|
|
|
|
|
In the future, the library will not use any configuration file. It will be up
|
|
|
|
|
to the front end to The handle holds a
|
|
|
|
|
number of configuration options instead (IGNOREPKG, SYSLOG usage,
|
|
|
|
|
log file name, registered databases, ...).
|
|
|
|
|
|
|
|
|
|
All of the following options have a alpm_option_get_* and alpm_option_set_*
|
|
|
|
|
function for getting and setting the value. The cannot be set before the
|
|
|
|
|
library is initialized.
|
|
|
|
|
|
|
|
|
|
* logcb: The callback function for "log" operations.
|
|
|
|
|
* dlcb: The callback function for download progress.
|
|
|
|
|
* logmask: The logging mask for which level of output is sent to the logcb.
|
|
|
|
|
* root: The root directory on which pacman operates (Default: /)
|
|
|
|
|
* dbpath: The base path to pacman's databases (Default: var/lib/pacman)
|
|
|
|
|
* cachedir: The base path to pacman's download cache (Default: var/cache/pacman)
|
|
|
|
|
* logfile: The base path to pacman's log file (Default: var/log/pacman.log)
|
|
|
|
|
* usesyslog: Log to syslog instead of `logfile` for file-base logging.
|
|
|
|
|
* upgradedelay: The time span to wait before listing a package as an upgrade (Default: 0)
|
|
|
|
|
* xfercommand: The command to use for downloading instead of pacman's internal
|
|
|
|
|
downloading functionality.
|
|
|
|
|
* nopassiveftp: Do not use passive FTP commands for ftp connections.
|
|
|
|
|
* chomp: No way, easter eggs are secret!
|
|
|
|
|
* usecolor: Unimplemented, but for the future. You can assume what it means.
|
|
|
|
|
|
|
|
|
|
The following options also have a `alpm_option_add_*` function, as the values
|
|
|
|
|
are list structures (NOTE: The add functions are NOT plural, as they're in
|
|
|
|
|
english: alpm_option_get_noupgrades -> alpm_option_add_noupgrade).
|
|
|
|
|
|
|
|
|
|
* noupgrades: Files which will never be touched by pacman (extracted as .pacnew)
|
|
|
|
|
* noextracts: Files which will never be extracted at all (no .pacnew file)
|
|
|
|
|
* ignorepkgs: Packages to ignore when upgrading.
|
|
|
|
|
* holdpkgs: Packages which must be upgraded before continuing.
|
|
|
|
|
|
|
|
|
|
The following options are read-only, having ONLY alpm_option_get_* functions:
|
|
|
|
|
|
|
|
|
|
* localdb: A pmdb_t structure for the local (installed) database
|
|
|
|
|
* syncdbs: A list of pmdb_t structures to which pacman can sync from.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
[Transactions]
|
|
|
|
|
|
|
|
|
|
The transaction sturcture permits easy manipulations of several packages
|
|
|
|
|
at a time (i.e. adding, upgrade and removal operations).
|
|
|
|
|
|
|
|
|
|
A transaction can be initiatied with a type (ADD, UPGRADE or REMOVE),
|
|
|
|
|
A transaction can be initiated with a type (ADD, UPGRADE or REMOVE),
|
|
|
|
|
and some flags (NODEPS, FORCE, CASCADE, ...).
|
|
|
|
|
|
|
|
|
|
Note: there can only be one type at a time: a transaction is either
|
|
|
|
@ -91,97 +106,60 @@ These targets represent the list of packages to be handled.
|
|
|
|
|
|
|
|
|
|
Then, a transaction needs to be prepared (alpm_trans_prepare()). It
|
|
|
|
|
means that the various targets added, will be inspected and challenged
|
|
|
|
|
against the set of alreayd installed packages (dependency checkings,
|
|
|
|
|
against the set of already installed packages (dependency checkings,
|
|
|
|
|
|
|
|
|
|
Last, a callback is associated with each transaction. During the
|
|
|
|
|
transaction resolution, each time a new step is started or done (i.e
|
|
|
|
|
dependency or conflict checkings, package adding or removal, ...), the
|
|
|
|
|
dependency or conflict checking, package adding or removal, ...), the
|
|
|
|
|
callback is called, allowing the frontend to be aware of the progress of
|
|
|
|
|
the resolution. Can be useful to implement a progress bar.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
[CONFIGURATION/OPTIONS] (see handle.c)
|
|
|
|
|
[Package Cache]
|
|
|
|
|
|
|
|
|
|
The library does not use any configuration file. The handle holds a
|
|
|
|
|
number of configuration options instead (IGNOREPKG, SYSLOG usage,
|
|
|
|
|
log file name, registered databases, ...).
|
|
|
|
|
It is up to the frontend to set the options of the library.
|
|
|
|
|
Options can be manipulated using calls to
|
|
|
|
|
alpm_set_option()/alpm_get_option().
|
|
|
|
|
|
|
|
|
|
Note: the file system root is a special option which can only be defined
|
|
|
|
|
when calling alpm_lib_init(). It can't be modified afterwards.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
[CACHE] (see cache.c)
|
|
|
|
|
|
|
|
|
|
Compared to pacman 2.9, there is now one cache object connected to each
|
|
|
|
|
database object.
|
|
|
|
|
There are both a package and a group cache.
|
|
|
|
|
The cache is loaded only on demand (i.e the cache is loaded the first
|
|
|
|
|
time data from it should be used).
|
|
|
|
|
|
|
|
|
|
Note: the cache of a database is always updated by the library after
|
|
|
|
|
libalpm maintains two caches for each DB. One is a general package cache, the
|
|
|
|
|
other is a group cache (for package groups). These caches are loaded on demand,
|
|
|
|
|
and freed when the libary is.
|
|
|
|
|
It is important to note tha, as a general rule, package structures should NOT be
|
|
|
|
|
freed manually, as they SHOULD be part of the cache.
|
|
|
|
|
The cache of a database is always updated by the library after
|
|
|
|
|
an operation changing the database content (adding and/or removal of
|
|
|
|
|
packages).
|
|
|
|
|
Beware frontends ;)
|
|
|
|
|
packages). Beware frontends ;)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
[PACKAGE] (see package.c, and also db.c)
|
|
|
|
|
[Package]
|
|
|
|
|
|
|
|
|
|
The package structure is using three new fields, namely: origin, data,
|
|
|
|
|
infolevel.
|
|
|
|
|
The purpose of these fields is to know some extra info about data stored
|
|
|
|
|
in package structures.
|
|
|
|
|
The package structure maintains all information for a package. In general,
|
|
|
|
|
packages should never be freed from front-ends, as they should always be part of
|
|
|
|
|
the package cache.
|
|
|
|
|
|
|
|
|
|
For instance, where is the package coming from (i.e origin)?
|
|
|
|
|
Was it loaded from a file or loaded from the cache?
|
|
|
|
|
If it's coming from a file, then the field data holds the full path and
|
|
|
|
|
name of the file, and infolevel is set to the highest possible value
|
|
|
|
|
(all package fields are reputed to be known).
|
|
|
|
|
Otherwise, if the package comes from a database, data is a pointer to
|
|
|
|
|
the database structure hosting the package, and infolevel is set
|
|
|
|
|
according to the db_read() infolevel parameter (it is possible using
|
|
|
|
|
db_read() to only read a part of the package datas).
|
|
|
|
|
|
|
|
|
|
Indeed, to reduce database access, all packages data requested by the
|
|
|
|
|
frontend are comming from the cache. As a consequence, the library needs
|
|
|
|
|
to know exactly the level of information about packages it holds, and
|
|
|
|
|
then decide if more data needs to be fetched from the database.
|
|
|
|
|
|
|
|
|
|
In file alpm.c, have a look at alpm_pkg_getinfo() function to get an
|
|
|
|
|
overview.
|
|
|
|
|
The 'origin' data member indicates whether the package is from a file
|
|
|
|
|
(i.e. -U operations) or from the package cache. In the case of a file, all data
|
|
|
|
|
members available are present in the structure. Packages indicated as being
|
|
|
|
|
from the cache have data members filled on demand. For this reason, the
|
|
|
|
|
alpm_pkg_get_* functions will load the data from the DB as needed.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
[ERRORS] (error.c)
|
|
|
|
|
[Errors]
|
|
|
|
|
|
|
|
|
|
The library provides a global variable pm_errno.
|
|
|
|
|
It aims at being to the library what errno is for C system calls.
|
|
|
|
|
|
|
|
|
|
Almost all public library functions are returning an integer value: 0
|
|
|
|
|
indicating success, whereas -1 would indicate a failure.
|
|
|
|
|
indicating success, -1 indicating a failure.
|
|
|
|
|
If -1 is returned, the variable pm_errno is set to a meaningful value
|
|
|
|
|
(not always yet, but it should improve ;).
|
|
|
|
|
Wise frontends should always care for these returned values.
|
|
|
|
|
|
|
|
|
|
Note: the helper function alpm_strerror() can also be used to translate
|
|
|
|
|
the error code into a more friendly sentence.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
[LIST] (see list.c, and especially list wrappers in alpm.c)
|
|
|
|
|
[List - alpm_list_t]
|
|
|
|
|
The alpm_list_t structure is a doubly-linked list for use with the libalpm
|
|
|
|
|
routines. This type is provided publicly so that frontends are free to use it
|
|
|
|
|
if they have no native list type (C++, glib, python, etc all have list types).
|
|
|
|
|
See the proper man pages for alpm_list_t references.
|
|
|
|
|
|
|
|
|
|
It is a double chained list structure, use only for the internal needs
|
|
|
|
|
of the library.
|
|
|
|
|
A frontend should be free to use its own data structures to manipulate
|
|
|
|
|
packages.
|
|
|
|
|
For instance, consider a graphical frontend using the gtk toolkit (and
|
|
|
|
|
as a consequence the glib library). The frontend will make use of the
|
|
|
|
|
glib chained lists or trees.
|
|
|
|
|
As a consequence, the library only provides a simple and very small
|
|
|
|
|
interface to retrieve pointers to its internal data (see functions
|
|
|
|
|
alpm_list_first(), alpm_list_next() and alpm_list_getdata()), giving to
|
|
|
|
|
the frontend the responsibility to copy and store the data retrieved
|
|
|
|
|
from the library in its own data structures.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
PACMAN frontend overview & internals
|
|
|
|
@ -189,7 +167,7 @@ PACMAN frontend overview & internals
|
|
|
|
|
|
|
|
|
|
Here are some words about the frontend responsibilities.
|
|
|
|
|
The library can operate only a small set of well defined operations and
|
|
|
|
|
dumy operations.
|
|
|
|
|
dummy operations.
|
|
|
|
|
|
|
|
|
|
High level features are left to the frontend ;)
|
|
|
|
|
|
|
|
|
@ -212,7 +190,7 @@ remove.c and sync.c).
|
|
|
|
|
[CONFIGURATION] (see conf.c)
|
|
|
|
|
|
|
|
|
|
The frontend is using a configuration file, usually "/etc/pacman.conf".
|
|
|
|
|
Part of these options are only usefull for the frontend only (mainly,
|
|
|
|
|
Part of these options are only useful for the frontend only (mainly,
|
|
|
|
|
the download stuffs, and some options like HOLDPKG).
|
|
|
|
|
The rest is used to configure the library.
|
|
|
|
|
|
|
|
|
@ -224,28 +202,8 @@ Nothing new here, excepted some reorganization.
|
|
|
|
|
The file pacman.c has been divided into several smaller files, namely
|
|
|
|
|
add.c, remove.c, sync.c and query.c, to hold the big parts: pacman_add,
|
|
|
|
|
pacman_remove, pacman_sync.
|
|
|
|
|
These 3 functions have been splitted too to ease the code reading.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
[DONWLOAD] (see download.c)
|
|
|
|
|
|
|
|
|
|
The library is not providing download facilities. As a consequence, it
|
|
|
|
|
is up the the frontend to retrieve packages from Arch Linux servers.
|
|
|
|
|
To do so, pacman is linked against an improved version of libftp
|
|
|
|
|
supporting both http and ftp donwloads.
|
|
|
|
|
As a consequence, the frontend is repsonsible for the directory
|
|
|
|
|
/var/cache/pacman/pkgs.
|
|
|
|
|
One can consider that this cache is a facility provided by pacman.
|
|
|
|
|
|
|
|
|
|
Note: other frontends have to download packages by themselves too,
|
|
|
|
|
although the cache directory can be shared by several frontends.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
[LIST] (see list.c)
|
|
|
|
|
|
|
|
|
|
Single chained list.
|
|
|
|
|
A minimalistic chained list implementation to store options from the
|
|
|
|
|
configuration file, and targets passed to pacman on the command line.
|
|
|
|
|
These 3 functions have been split to ease the code reading.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
LIMITATIONS/BEHAVIOR CHANGES COMPARED TO PACMAN 2.9
|
|
|
|
|