| .. SPDX-License-Identifier: CC-BY-2.5 |
| |
| ================== |
| Variables Glossary |
| ================== |
| |
| | |
| |
| This chapter lists common variables used by BitBake and gives an |
| overview of their function and contents. |
| |
| .. note:: |
| |
| Following are some points regarding the variables listed in this |
| glossary: |
| |
| - The variables listed in this glossary are specific to BitBake. |
| Consequently, the descriptions are limited to that context. |
| |
| - Also, variables exist in other systems that use BitBake (e.g. The |
| Yocto Project and OpenEmbedded) that have names identical to those |
| found in this glossary. For such cases, the variables in those |
| systems extend the functionality of the variable as it is |
| described here in this glossary. |
| |
| .. glossary:: |
| :sorted: |
| |
| :term:`ASSUME_PROVIDED` |
| Lists recipe names (:term:`PN` values) BitBake does not |
| attempt to build. Instead, BitBake assumes these recipes have already |
| been built. |
| |
| In OpenEmbedded-Core, :term:`ASSUME_PROVIDED` mostly specifies native |
| tools that should not be built. An example is ``git-native``, which |
| when specified allows for the Git binary from the host to be used |
| rather than building ``git-native``. |
| |
| :term:`AZ_SAS` |
| Azure Storage Shared Access Signature, when using the |
| :ref:`Azure Storage fetcher <bitbake-user-manual/bitbake-user-manual-fetching:fetchers>` |
| This variable can be defined to be used by the fetcher to authenticate |
| and gain access to non-public artifacts. |
| :: |
| |
| AZ_SAS = ""se=2021-01-01&sp=r&sv=2018-11-09&sr=c&skoid=<skoid>&sig=<signature>"" |
| |
| For more information see Microsoft's Azure Storage documentation at |
| https://docs.microsoft.com/en-us/azure/storage/common/storage-sas-overview |
| |
| |
| :term:`B` |
| The directory in which BitBake executes functions during a recipe's |
| build process. |
| |
| :term:`BB_ALLOWED_NETWORKS` |
| Specifies a space-delimited list of hosts that the fetcher is allowed |
| to use to obtain the required source code. Following are |
| considerations surrounding this variable: |
| |
| - This host list is only used if |
| :term:`BB_NO_NETWORK` is either not set or |
| set to "0". |
| |
| - Limited support for the "``*``" wildcard character for matching |
| against the beginning of host names exists. For example, the |
| following setting matches ``git.gnu.org``, ``ftp.gnu.org``, and |
| ``foo.git.gnu.org``. :: |
| |
| BB_ALLOWED_NETWORKS = "\*.gnu.org" |
| |
| .. important:: |
| |
| The use of the "``*``" character only works at the beginning of |
| a host name and it must be isolated from the remainder of the |
| host name. You cannot use the wildcard character in any other |
| location of the name or combined with the front part of the |
| name. |
| |
| For example, ``*.foo.bar`` is supported, while ``*aa.foo.bar`` |
| is not. |
| |
| - Mirrors not in the host list are skipped and logged in debug. |
| |
| - Attempts to access networks not in the host list cause a failure. |
| |
| Using :term:`BB_ALLOWED_NETWORKS` in conjunction with |
| :term:`PREMIRRORS` is very useful. Adding the |
| host you want to use to :term:`PREMIRRORS` results in the source code |
| being fetched from an allowed location and avoids raising an error |
| when a host that is not allowed is in a |
| :term:`SRC_URI` statement. This is because the |
| fetcher does not attempt to use the host listed in :term:`SRC_URI` after |
| a successful fetch from the :term:`PREMIRRORS` occurs. |
| |
| :term:`BB_CHECK_SSL_CERTS` |
| Specifies if SSL certificates should be checked when fetching. The default |
| value is ``1`` and certificates are not checked if the value is set to ``0``. |
| |
| :term:`BB_CONSOLELOG` |
| Specifies the path to a log file into which BitBake's user interface |
| writes output during the build. |
| |
| :term:`BB_CURRENTTASK` |
| Contains the name of the currently running task. The name does not |
| include the ``do_`` prefix. |
| |
| :term:`BB_DANGLINGAPPENDS_WARNONLY` |
| Defines how BitBake handles situations where an append file |
| (``.bbappend``) has no corresponding recipe file (``.bb``). This |
| condition often occurs when layers get out of sync (e.g. ``oe-core`` |
| bumps a recipe version and the old recipe no longer exists and the |
| other layer has not been updated to the new version of the recipe |
| yet). |
| |
| The default fatal behavior is safest because it is the sane reaction |
| given something is out of sync. It is important to realize when your |
| changes are no longer being applied. |
| |
| :term:`BB_DEFAULT_TASK` |
| The default task to use when none is specified (e.g. with the ``-c`` |
| command line option). The task name specified should not include the |
| ``do_`` prefix. |
| |
| :term:`BB_DEFAULT_UMASK` |
| The default umask to apply to tasks if specified and no task specific |
| umask flag is set. |
| |
| :term:`BB_DISKMON_DIRS` |
| Monitors disk space and available inodes during the build and allows |
| you to control the build based on these parameters. |
| |
| Disk space monitoring is disabled by default. When setting this |
| variable, use the following form:: |
| |
| BB_DISKMON_DIRS = "<action>,<dir>,<threshold> [...]" |
| |
| where: |
| |
| <action> is: |
| ABORT: Immediately abort the build when |
| a threshold is broken. |
| STOPTASKS: Stop the build after the currently |
| executing tasks have finished when |
| a threshold is broken. |
| WARN: Issue a warning but continue the |
| build when a threshold is broken. |
| Subsequent warnings are issued as |
| defined by the |
| BB_DISKMON_WARNINTERVAL variable, |
| which must be defined. |
| |
| <dir> is: |
| Any directory you choose. You can specify one or |
| more directories to monitor by separating the |
| groupings with a space. If two directories are |
| on the same device, only the first directory |
| is monitored. |
| |
| <threshold> is: |
| Either the minimum available disk space, |
| the minimum number of free inodes, or |
| both. You must specify at least one. To |
| omit one or the other, simply omit the value. |
| Specify the threshold using G, M, K for Gbytes, |
| Mbytes, and Kbytes, respectively. If you do |
| not specify G, M, or K, Kbytes is assumed by |
| default. Do not use GB, MB, or KB. |
| |
| Here are some examples:: |
| |
| BB_DISKMON_DIRS = "ABORT,${TMPDIR},1G,100K WARN,${SSTATE_DIR},1G,100K" |
| BB_DISKMON_DIRS = "STOPTASKS,${TMPDIR},1G" |
| BB_DISKMON_DIRS = "ABORT,${TMPDIR},,100K" |
| |
| The first example works only if you also set the |
| :term:`BB_DISKMON_WARNINTERVAL` |
| variable. This example causes the build system to immediately abort |
| when either the disk space in ``${TMPDIR}`` drops below 1 Gbyte or |
| the available free inodes drops below 100 Kbytes. Because two |
| directories are provided with the variable, the build system also |
| issues a warning when the disk space in the ``${SSTATE_DIR}`` |
| directory drops below 1 Gbyte or the number of free inodes drops |
| below 100 Kbytes. Subsequent warnings are issued during intervals as |
| defined by the :term:`BB_DISKMON_WARNINTERVAL` variable. |
| |
| The second example stops the build after all currently executing |
| tasks complete when the minimum disk space in the ``${TMPDIR}`` |
| directory drops below 1 Gbyte. No disk monitoring occurs for the free |
| inodes in this case. |
| |
| The final example immediately aborts the build when the number of |
| free inodes in the ``${TMPDIR}`` directory drops below 100 Kbytes. No |
| disk space monitoring for the directory itself occurs in this case. |
| |
| :term:`BB_DISKMON_WARNINTERVAL` |
| Defines the disk space and free inode warning intervals. |
| |
| If you are going to use the :term:`BB_DISKMON_WARNINTERVAL` variable, you |
| must also use the :term:`BB_DISKMON_DIRS` |
| variable and define its action as "WARN". During the build, |
| subsequent warnings are issued each time disk space or number of free |
| inodes further reduces by the respective interval. |
| |
| If you do not provide a :term:`BB_DISKMON_WARNINTERVAL` variable and you |
| do use :term:`BB_DISKMON_DIRS` with the "WARN" action, the disk |
| monitoring interval defaults to the following: |
| BB_DISKMON_WARNINTERVAL = "50M,5K" |
| |
| When specifying the variable in your configuration file, use the |
| following form:: |
| |
| BB_DISKMON_WARNINTERVAL = "<disk_space_interval>,<disk_inode_interval>" |
| |
| where: |
| |
| <disk_space_interval> is: |
| An interval of memory expressed in either |
| G, M, or K for Gbytes, Mbytes, or Kbytes, |
| respectively. You cannot use GB, MB, or KB. |
| |
| <disk_inode_interval> is: |
| An interval of free inodes expressed in either |
| G, M, or K for Gbytes, Mbytes, or Kbytes, |
| respectively. You cannot use GB, MB, or KB. |
| |
| Here is an example:: |
| |
| BB_DISKMON_DIRS = "WARN,${SSTATE_DIR},1G,100K" |
| BB_DISKMON_WARNINTERVAL = "50M,5K" |
| |
| These variables cause BitBake to |
| issue subsequent warnings each time the available disk space further |
| reduces by 50 Mbytes or the number of free inodes further reduces by |
| 5 Kbytes in the ``${SSTATE_DIR}`` directory. Subsequent warnings |
| based on the interval occur each time a respective interval is |
| reached beyond the initial warning (i.e. 1 Gbytes and 100 Kbytes). |
| |
| :term:`BB_ENV_EXTRAWHITE` |
| Specifies an additional set of variables to allow through (whitelist) |
| from the external environment into BitBake's datastore. This list of |
| variables are on top of the internal list set in |
| :term:`BB_ENV_WHITELIST`. |
| |
| .. note:: |
| |
| You must set this variable in the external environment in order |
| for it to work. |
| |
| :term:`BB_ENV_WHITELIST` |
| Specifies the internal whitelist of variables to allow through from |
| the external environment into BitBake's datastore. If the value of |
| this variable is not specified (which is the default), the following |
| list is used: :term:`BBPATH`, :term:`BB_PRESERVE_ENV`, |
| :term:`BB_ENV_WHITELIST`, and :term:`BB_ENV_EXTRAWHITE`. |
| |
| .. note:: |
| |
| You must set this variable in the external environment in order |
| for it to work. |
| |
| :term:`BB_FETCH_PREMIRRORONLY` |
| When set to "1", causes BitBake's fetcher module to only search |
| :term:`PREMIRRORS` for files. BitBake will not |
| search the main :term:`SRC_URI` or |
| :term:`MIRRORS`. |
| |
| :term:`BB_FILENAME` |
| Contains the filename of the recipe that owns the currently running |
| task. For example, if the ``do_fetch`` task that resides in the |
| ``my-recipe.bb`` is executing, the :term:`BB_FILENAME` variable contains |
| "/foo/path/my-recipe.bb". |
| |
| :term:`BB_GENERATE_MIRROR_TARBALLS` |
| Causes tarballs of the Git repositories, including the Git metadata, |
| to be placed in the :term:`DL_DIR` directory. Anyone |
| wishing to create a source mirror would want to enable this variable. |
| |
| For performance reasons, creating and placing tarballs of the Git |
| repositories is not the default action by BitBake. :: |
| |
| BB_GENERATE_MIRROR_TARBALLS = "1" |
| |
| :term:`BB_HASHBASE_WHITELIST` |
| Lists variables that are excluded from checksum and dependency data. |
| Variables that are excluded can therefore change without affecting |
| the checksum mechanism. A common example would be the variable for |
| the path of the build. BitBake's output should not (and usually does |
| not) depend on the directory in which it was built. |
| |
| :term:`BB_HASHCHECK_FUNCTION` |
| Specifies the name of the function to call during the "setscene" part |
| of the task's execution in order to validate the list of task hashes. |
| The function returns the list of setscene tasks that should be |
| executed. |
| |
| At this point in the execution of the code, the objective is to |
| quickly verify if a given setscene function is likely to work or not. |
| It's easier to check the list of setscene functions in one pass than |
| to call many individual tasks. The returned list need not be |
| completely accurate. A given setscene task can still later fail. |
| However, the more accurate the data returned, the more efficient the |
| build will be. |
| |
| :term:`BB_HASHCONFIG_WHITELIST` |
| Lists variables that are excluded from base configuration checksum, |
| which is used to determine if the cache can be reused. |
| |
| One of the ways BitBake determines whether to re-parse the main |
| metadata is through checksums of the variables in the datastore of |
| the base configuration data. There are variables that you typically |
| want to exclude when checking whether or not to re-parse and thus |
| rebuild the cache. As an example, you would usually exclude ``TIME`` |
| and ``DATE`` because these variables are always changing. If you did |
| not exclude them, BitBake would never reuse the cache. |
| |
| :term:`BB_HASHSERVE` |
| Specifies the Hash Equivalence server to use. |
| |
| If set to ``auto``, BitBake automatically starts its own server |
| over a UNIX domain socket. |
| |
| If set to ``host:port``, BitBake will use a remote server on the |
| specified host. This allows multiple clients to share the same |
| hash equivalence data. |
| |
| :term:`BB_INVALIDCONF` |
| Used in combination with the ``ConfigParsed`` event to trigger |
| re-parsing the base metadata (i.e. all the recipes). The |
| ``ConfigParsed`` event can set the variable to trigger the re-parse. |
| You must be careful to avoid recursive loops with this functionality. |
| |
| :term:`BB_LOGCONFIG` |
| Specifies the name of a config file that contains the user logging |
| configuration. See |
| :ref:`bitbake-user-manual/bitbake-user-manual-execution:logging` |
| for additional information |
| |
| :term:`BB_LOGFMT` |
| Specifies the name of the log files saved into |
| ``${``\ :term:`T`\ ``}``. By default, the :term:`BB_LOGFMT` |
| variable is undefined and the log file names get created using the |
| following form:: |
| |
| log.{task}.{pid} |
| |
| If you want to force log files to take a specific name, you can set this |
| variable in a configuration file. |
| |
| :term:`BB_NICE_LEVEL` |
| Allows BitBake to run at a specific priority (i.e. nice level). |
| System permissions usually mean that BitBake can reduce its priority |
| but not raise it again. See :term:`BB_TASK_NICE_LEVEL` for |
| additional information. |
| |
| :term:`BB_NO_NETWORK` |
| Disables network access in the BitBake fetcher modules. With this |
| access disabled, any command that attempts to access the network |
| becomes an error. |
| |
| Disabling network access is useful for testing source mirrors, |
| running builds when not connected to the Internet, and when operating |
| in certain kinds of firewall environments. |
| |
| :term:`BB_NUMBER_PARSE_THREADS` |
| Sets the number of threads BitBake uses when parsing. By default, the |
| number of threads is equal to the number of cores on the system. |
| |
| :term:`BB_NUMBER_THREADS` |
| The maximum number of tasks BitBake should run in parallel at any one |
| time. If your host development system supports multiple cores, a good |
| rule of thumb is to set this variable to twice the number of cores. |
| |
| :term:`BB_ORIGENV` |
| Contains a copy of the original external environment in which BitBake |
| was run. The copy is taken before any whitelisted variable values are |
| filtered into BitBake's datastore. |
| |
| .. note:: |
| |
| The contents of this variable is a datastore object that can be |
| queried using the normal datastore operations. |
| |
| :term:`BB_PRESERVE_ENV` |
| Disables whitelisting and instead allows all variables through from |
| the external environment into BitBake's datastore. |
| |
| .. note:: |
| |
| You must set this variable in the external environment in order |
| for it to work. |
| |
| :term:`BB_RUNFMT` |
| Specifies the name of the executable script files (i.e. run files) |
| saved into ``${``\ :term:`T`\ ``}``. By default, the |
| :term:`BB_RUNFMT` variable is undefined and the run file names get |
| created using the following form:: |
| |
| run.{task}.{pid} |
| |
| If you want to force run files to take a specific name, you can set this |
| variable in a configuration file. |
| |
| :term:`BB_RUNTASK` |
| Contains the name of the currently executing task. The value includes |
| the "do\_" prefix. For example, if the currently executing task is |
| ``do_config``, the value is "do_config". |
| |
| :term:`BB_SCHEDULER` |
| Selects the name of the scheduler to use for the scheduling of |
| BitBake tasks. Three options exist: |
| |
| - *basic* - The basic framework from which everything derives. Using |
| this option causes tasks to be ordered numerically as they are |
| parsed. |
| |
| - *speed* - Executes tasks first that have more tasks depending on |
| them. The "speed" option is the default. |
| |
| - *completion* - Causes the scheduler to try to complete a given |
| recipe once its build has started. |
| |
| :term:`BB_SCHEDULERS` |
| Defines custom schedulers to import. Custom schedulers need to be |
| derived from the ``RunQueueScheduler`` class. |
| |
| For information how to select a scheduler, see the |
| :term:`BB_SCHEDULER` variable. |
| |
| :term:`BB_SETSCENE_DEPVALID` |
| Specifies a function BitBake calls that determines whether BitBake |
| requires a setscene dependency to be met. |
| |
| When running a setscene task, BitBake needs to know which |
| dependencies of that setscene task also need to be run. Whether |
| dependencies also need to be run is highly dependent on the metadata. |
| The function specified by this variable returns a "True" or "False" |
| depending on whether the dependency needs to be met. |
| |
| :term:`BB_SIGNATURE_EXCLUDE_FLAGS` |
| Lists variable flags (varflags) that can be safely excluded from |
| checksum and dependency data for keys in the datastore. When |
| generating checksum or dependency data for keys in the datastore, the |
| flags set against that key are normally included in the checksum. |
| |
| For more information on varflags, see the |
| ":ref:`bitbake-user-manual/bitbake-user-manual-metadata:variable flags`" |
| section. |
| |
| :term:`BB_SIGNATURE_HANDLER` |
| Defines the name of the signature handler BitBake uses. The signature |
| handler defines the way stamp files are created and handled, if and |
| how the signature is incorporated into the stamps, and how the |
| signature itself is generated. |
| |
| A new signature handler can be added by injecting a class derived |
| from the ``SignatureGenerator`` class into the global namespace. |
| |
| :term:`BB_SRCREV_POLICY` |
| Defines the behavior of the fetcher when it interacts with source |
| control systems and dynamic source revisions. The |
| :term:`BB_SRCREV_POLICY` variable is useful when working without a |
| network. |
| |
| The variable can be set using one of two policies: |
| |
| - *cache* - Retains the value the system obtained previously rather |
| than querying the source control system each time. |
| |
| - *clear* - Queries the source controls system every time. With this |
| policy, there is no cache. The "clear" policy is the default. |
| |
| :term:`BB_STAMP_POLICY` |
| Defines the mode used for how timestamps of stamp files are compared. |
| You can set the variable to one of the following modes: |
| |
| - *perfile* - Timestamp comparisons are only made between timestamps |
| of a specific recipe. This is the default mode. |
| |
| - *full* - Timestamp comparisons are made for all dependencies. |
| |
| - *whitelist* - Identical to "full" mode except timestamp |
| comparisons are made for recipes listed in the |
| :term:`BB_STAMP_WHITELIST` variable. |
| |
| .. note:: |
| |
| Stamp policies are largely obsolete with the introduction of |
| setscene tasks. |
| |
| :term:`BB_STAMP_WHITELIST` |
| Lists files whose stamp file timestamps are compared when the stamp |
| policy mode is set to "whitelist". For information on stamp policies, |
| see the :term:`BB_STAMP_POLICY` variable. |
| |
| :term:`BB_STRICT_CHECKSUM` |
| Sets a more strict checksum mechanism for non-local URLs. Setting |
| this variable to a value causes BitBake to report an error if it |
| encounters a non-local URL that does not have at least one checksum |
| specified. |
| |
| :term:`BB_TASK_IONICE_LEVEL` |
| Allows adjustment of a task's Input/Output priority. During |
| Autobuilder testing, random failures can occur for tasks due to I/O |
| starvation. These failures occur during various QEMU runtime |
| timeouts. You can use the :term:`BB_TASK_IONICE_LEVEL` variable to adjust |
| the I/O priority of these tasks. |
| |
| .. note:: |
| |
| This variable works similarly to the :term:`BB_TASK_NICE_LEVEL` |
| variable except with a task's I/O priorities. |
| |
| Set the variable as follows:: |
| |
| BB_TASK_IONICE_LEVEL = "class.prio" |
| |
| For *class*, the default value is "2", which is a best effort. You can use |
| "1" for realtime and "3" for idle. If you want to use realtime, you |
| must have superuser privileges. |
| |
| For *prio*, you can use any value from "0", which is the highest |
| priority, to "7", which is the lowest. The default value is "4". You |
| do not need any special privileges to use this range of priority |
| values. |
| |
| .. note:: |
| |
| In order for your I/O priority settings to take effect, you need the |
| Completely Fair Queuing (CFQ) Scheduler selected for the backing block |
| device. To select the scheduler, use the following command form where |
| device is the device (e.g. sda, sdb, and so forth):: |
| |
| $ sudo sh -c "echo cfq > /sys/block/device/queu/scheduler" |
| |
| :term:`BB_TASK_NICE_LEVEL` |
| Allows specific tasks to change their priority (i.e. nice level). |
| |
| You can use this variable in combination with task overrides to raise |
| or lower priorities of specific tasks. For example, on the `Yocto |
| Project <http://www.yoctoproject.org>`__ autobuilder, QEMU emulation |
| in images is given a higher priority as compared to build tasks to |
| ensure that images do not suffer timeouts on loaded systems. |
| |
| :term:`BB_TASKHASH` |
| Within an executing task, this variable holds the hash of the task as |
| returned by the currently enabled signature generator. |
| |
| :term:`BB_VERBOSE_LOGS` |
| Controls how verbose BitBake is during builds. If set, shell scripts |
| echo commands and shell script output appears on standard out |
| (stdout). |
| |
| :term:`BB_WORKERCONTEXT` |
| Specifies if the current context is executing a task. BitBake sets |
| this variable to "1" when a task is being executed. The value is not |
| set when the task is in server context during parsing or event |
| handling. |
| |
| :term:`BBCLASSEXTEND` |
| Allows you to extend a recipe so that it builds variants of the |
| software. Some examples of these variants for recipes from the |
| OpenEmbedded-Core metadata are "natives" such as ``quilt-native``, |
| which is a copy of Quilt built to run on the build system; "crosses" |
| such as ``gcc-cross``, which is a compiler built to run on the build |
| machine but produces binaries that run on the target ``MACHINE``; |
| "nativesdk", which targets the SDK machine instead of ``MACHINE``; |
| and "mulitlibs" in the form "``multilib:``\ multilib_name". |
| |
| To build a different variant of the recipe with a minimal amount of |
| code, it usually is as simple as adding the variable to your recipe. |
| Here are two examples. The "native" variants are from the |
| OpenEmbedded-Core metadata:: |
| |
| BBCLASSEXTEND =+ "native nativesdk" |
| BBCLASSEXTEND =+ "multilib:multilib_name" |
| |
| .. note:: |
| |
| Internally, the :term:`BBCLASSEXTEND` mechanism generates recipe |
| variants by rewriting variable values and applying overrides such |
| as ``_class-native``. For example, to generate a native version of |
| a recipe, a :term:`DEPENDS` on "foo" is |
| rewritten to a :term:`DEPENDS` on "foo-native". |
| |
| Even when using :term:`BBCLASSEXTEND`, the recipe is only parsed once. |
| Parsing once adds some limitations. For example, it is not |
| possible to include a different file depending on the variant, |
| since ``include`` statements are processed when the recipe is |
| parsed. |
| |
| :term:`BBDEBUG` |
| Sets the BitBake debug output level to a specific value as |
| incremented by the ``-D`` command line option. |
| |
| .. note:: |
| |
| You must set this variable in the external environment in order |
| for it to work. |
| |
| :term:`BBFILE_COLLECTIONS` |
| Lists the names of configured layers. These names are used to find |
| the other ``BBFILE_*`` variables. Typically, each layer appends its |
| name to this variable in its ``conf/layer.conf`` file. |
| |
| :term:`BBFILE_PATTERN` |
| Variable that expands to match files from |
| :term:`BBFILES` in a particular layer. This |
| variable is used in the ``conf/layer.conf`` file and must be suffixed |
| with the name of the specific layer (e.g. |
| ``BBFILE_PATTERN_emenlow``). |
| |
| :term:`BBFILE_PRIORITY` |
| Assigns the priority for recipe files in each layer. |
| |
| This variable is useful in situations where the same recipe appears |
| in more than one layer. Setting this variable allows you to |
| prioritize a layer against other layers that contain the same recipe |
| - effectively letting you control the precedence for the multiple |
| layers. The precedence established through this variable stands |
| regardless of a recipe's version (:term:`PV` variable). |
| For example, a layer that has a recipe with a higher :term:`PV` value but |
| for which the :term:`BBFILE_PRIORITY` is set to have a lower precedence |
| still has a lower precedence. |
| |
| A larger value for the :term:`BBFILE_PRIORITY` variable results in a |
| higher precedence. For example, the value 6 has a higher precedence |
| than the value 5. If not specified, the :term:`BBFILE_PRIORITY` variable |
| is set based on layer dependencies (see the :term:`LAYERDEPENDS` variable |
| for more information. The default priority, if unspecified for a |
| layer with no dependencies, is the lowest defined priority + 1 (or 1 |
| if no priorities are defined). |
| |
| .. tip:: |
| |
| You can use the command bitbake-layers show-layers to list all |
| configured layers along with their priorities. |
| |
| :term:`BBFILES` |
| A space-separated list of recipe files BitBake uses to build |
| software. |
| |
| When specifying recipe files, you can pattern match using Python's |
| `glob <https://docs.python.org/3/library/glob.html>`_ syntax. |
| For details on the syntax, see the documentation by following the |
| previous link. |
| |
| :term:`BBFILES_DYNAMIC` |
| Activates content depending on presence of identified layers. You |
| identify the layers by the collections that the layers define. |
| |
| Use the :term:`BBFILES_DYNAMIC` variable to avoid ``.bbappend`` files whose |
| corresponding ``.bb`` file is in a layer that attempts to modify other |
| layers through ``.bbappend`` but does not want to introduce a hard |
| dependency on those other layers. |
| |
| Additionally you can prefix the rule with "!" to add ``.bbappend`` and |
| ``.bb`` files in case a layer is not present. Use this avoid hard |
| dependency on those other layers. |
| |
| Use the following form for :term:`BBFILES_DYNAMIC`:: |
| |
| collection_name:filename_pattern |
| |
| The following example identifies two collection names and two filename |
| patterns:: |
| |
| BBFILES_DYNAMIC += "\ |
| clang-layer:${LAYERDIR}/bbappends/meta-clang/*/*/*.bbappend \ |
| core:${LAYERDIR}/bbappends/openembedded-core/meta/*/*/*.bbappend \ |
| " |
| |
| When the collection name is prefixed with "!" it will add the file pattern in case |
| the layer is absent:: |
| |
| BBFILES_DYNAMIC += "\ |
| !clang-layer:${LAYERDIR}/backfill/meta-clang/*/*/*.bb \ |
| " |
| |
| This next example shows an error message that occurs because invalid |
| entries are found, which cause parsing to abort:: |
| |
| ERROR: BBFILES_DYNAMIC entries must be of the form {!}<collection name>:<filename pattern>, not: |
| /work/my-layer/bbappends/meta-security-isafw/*/*/*.bbappend |
| /work/my-layer/bbappends/openembedded-core/meta/*/*/*.bbappend |
| |
| :term:`BBINCLUDED` |
| Contains a space-separated list of all of all files that BitBake's |
| parser included during parsing of the current file. |
| |
| :term:`BBINCLUDELOGS` |
| If set to a value, enables printing the task log when reporting a |
| failed task. |
| |
| :term:`BBINCLUDELOGS_LINES` |
| If :term:`BBINCLUDELOGS` is set, specifies |
| the maximum number of lines from the task log file to print when |
| reporting a failed task. If you do not set :term:`BBINCLUDELOGS_LINES`, |
| the entire log is printed. |
| |
| :term:`BBLAYERS` |
| Lists the layers to enable during the build. This variable is defined |
| in the ``bblayers.conf`` configuration file in the build directory. |
| Here is an example:: |
| |
| BBLAYERS = " \ |
| /home/scottrif/poky/meta \ |
| /home/scottrif/poky/meta-yocto \ |
| /home/scottrif/poky/meta-yocto-bsp \ |
| /home/scottrif/poky/meta-mykernel \ |
| " |
| |
| This example enables four layers, one of which is a custom, user-defined |
| layer named ``meta-mykernel``. |
| |
| :term:`BBLAYERS_FETCH_DIR` |
| Sets the base location where layers are stored. This setting is used |
| in conjunction with ``bitbake-layers layerindex-fetch`` and tells |
| ``bitbake-layers`` where to place the fetched layers. |
| |
| :term:`BBMASK` |
| Prevents BitBake from processing recipes and recipe append files. |
| |
| You can use the :term:`BBMASK` variable to "hide" these ``.bb`` and |
| ``.bbappend`` files. BitBake ignores any recipe or recipe append |
| files that match any of the expressions. It is as if BitBake does not |
| see them at all. Consequently, matching files are not parsed or |
| otherwise used by BitBake. |
| |
| The values you provide are passed to Python's regular expression |
| compiler. Consequently, the syntax follows Python's Regular |
| Expression (re) syntax. The expressions are compared against the full |
| paths to the files. For complete syntax information, see Python's |
| documentation at http://docs.python.org/3/library/re.html. |
| |
| The following example uses a complete regular expression to tell |
| BitBake to ignore all recipe and recipe append files in the |
| ``meta-ti/recipes-misc/`` directory:: |
| |
| BBMASK = "meta-ti/recipes-misc/" |
| |
| If you want to mask out multiple directories or recipes, you can |
| specify multiple regular expression fragments. This next example |
| masks out multiple directories and individual recipes:: |
| |
| BBMASK += "/meta-ti/recipes-misc/ meta-ti/recipes-ti/packagegroup/" |
| BBMASK += "/meta-oe/recipes-support/" |
| BBMASK += "/meta-foo/.*/openldap" |
| BBMASK += "opencv.*\.bbappend" |
| BBMASK += "lzma" |
| |
| .. note:: |
| |
| When specifying a directory name, use the trailing slash character |
| to ensure you match just that directory name. |
| |
| :term:`BBMULTICONFIG` |
| Enables BitBake to perform multiple configuration builds and lists |
| each separate configuration (multiconfig). You can use this variable |
| to cause BitBake to build multiple targets where each target has a |
| separate configuration. Define :term:`BBMULTICONFIG` in your |
| ``conf/local.conf`` configuration file. |
| |
| As an example, the following line specifies three multiconfigs, each |
| having a separate configuration file:: |
| |
| BBMULTIFONFIG = "configA configB configC" |
| |
| Each configuration file you use must reside in the |
| build directory within a directory named ``conf/multiconfig`` (e.g. |
| build_directory\ ``/conf/multiconfig/configA.conf``). |
| |
| For information on how to use :term:`BBMULTICONFIG` in an environment |
| that supports building targets with multiple configurations, see the |
| ":ref:`bitbake-user-manual/bitbake-user-manual-intro:executing a multiple configuration build`" |
| section. |
| |
| :term:`BBPATH` |
| Used by BitBake to locate class (``.bbclass``) and configuration |
| (``.conf``) files. This variable is analogous to the ``PATH`` |
| variable. |
| |
| If you run BitBake from a directory outside of the build directory, |
| you must be sure to set :term:`BBPATH` to point to the build directory. |
| Set the variable as you would any environment variable and then run |
| BitBake:: |
| |
| $ BBPATH="build_directory" |
| $ export BBPATH |
| $ bitbake target |
| |
| :term:`BBSERVER` |
| Points to the server that runs memory-resident BitBake. The variable |
| is only used when you employ memory-resident BitBake. |
| |
| :term:`BBTARGETS` |
| Allows you to use a configuration file to add to the list of |
| command-line target recipes you want to build. |
| |
| :term:`BITBAKE_UI` |
| Used to specify the UI module to use when running BitBake. Using this |
| variable is equivalent to using the ``-u`` command-line option. |
| |
| .. note:: |
| |
| You must set this variable in the external environment in order |
| for it to work. |
| |
| :term:`BUILDNAME` |
| A name assigned to the build. The name defaults to a datetime stamp |
| of when the build was started but can be defined by the metadata. |
| |
| :term:`BZRDIR` |
| The directory in which files checked out of a Bazaar system are |
| stored. |
| |
| :term:`CACHE` |
| Specifies the directory BitBake uses to store a cache of the metadata |
| so it does not need to be parsed every time BitBake is started. |
| |
| :term:`CVSDIR` |
| The directory in which files checked out under the CVS system are |
| stored. |
| |
| :term:`DEFAULT_PREFERENCE` |
| Specifies a weak bias for recipe selection priority. |
| |
| The most common usage of this is variable is to set it to "-1" within |
| a recipe for a development version of a piece of software. Using the |
| variable in this way causes the stable version of the recipe to build |
| by default in the absence of :term:`PREFERRED_VERSION` being used to |
| build the development version. |
| |
| .. note:: |
| |
| The bias provided by DEFAULT_PREFERENCE is weak and is overridden by |
| :term:`BBFILE_PRIORITY` if that variable is different between two |
| layers that contain different versions of the same recipe. |
| |
| :term:`DEPENDS` |
| Lists a recipe's build-time dependencies (i.e. other recipe files). |
| |
| Consider this simple example for two recipes named "a" and "b" that |
| produce similarly named packages. In this example, the :term:`DEPENDS` |
| statement appears in the "a" recipe:: |
| |
| DEPENDS = "b" |
| |
| Here, the dependency is such that the ``do_configure`` task for recipe "a" |
| depends on the ``do_populate_sysroot`` task of recipe "b". This means |
| anything that recipe "b" puts into sysroot is available when recipe "a" is |
| configuring itself. |
| |
| For information on runtime dependencies, see the :term:`RDEPENDS` |
| variable. |
| |
| :term:`DESCRIPTION` |
| A long description for the recipe. |
| |
| :term:`DL_DIR` |
| The central download directory used by the build process to store |
| downloads. By default, :term:`DL_DIR` gets files suitable for mirroring for |
| everything except Git repositories. If you want tarballs of Git |
| repositories, use the :term:`BB_GENERATE_MIRROR_TARBALLS` variable. |
| |
| :term:`EXCLUDE_FROM_WORLD` |
| Directs BitBake to exclude a recipe from world builds (i.e. |
| ``bitbake world``). During world builds, BitBake locates, parses and |
| builds all recipes found in every layer exposed in the |
| ``bblayers.conf`` configuration file. |
| |
| To exclude a recipe from a world build using this variable, set the |
| variable to "1" in the recipe. |
| |
| .. note:: |
| |
| Recipes added to :term:`EXCLUDE_FROM_WORLD` may still be built during a world |
| build in order to satisfy dependencies of other recipes. Adding a |
| recipe to :term:`EXCLUDE_FROM_WORLD` only ensures that the recipe is not |
| explicitly added to the list of build targets in a world build. |
| |
| :term:`FAKEROOT` |
| Contains the command to use when running a shell script in a fakeroot |
| environment. The :term:`FAKEROOT` variable is obsolete and has been |
| replaced by the other ``FAKEROOT*`` variables. See these entries in |
| the glossary for more information. |
| |
| :term:`FAKEROOTBASEENV` |
| Lists environment variables to set when executing the command defined |
| by :term:`FAKEROOTCMD` that starts the |
| bitbake-worker process in the fakeroot environment. |
| |
| :term:`FAKEROOTCMD` |
| Contains the command that starts the bitbake-worker process in the |
| fakeroot environment. |
| |
| :term:`FAKEROOTDIRS` |
| Lists directories to create before running a task in the fakeroot |
| environment. |
| |
| :term:`FAKEROOTENV` |
| Lists environment variables to set when running a task in the |
| fakeroot environment. For additional information on environment |
| variables and the fakeroot environment, see the |
| :term:`FAKEROOTBASEENV` variable. |
| |
| :term:`FAKEROOTNOENV` |
| Lists environment variables to set when running a task that is not in |
| the fakeroot environment. For additional information on environment |
| variables and the fakeroot environment, see the |
| :term:`FAKEROOTENV` variable. |
| |
| :term:`FETCHCMD` |
| Defines the command the BitBake fetcher module executes when running |
| fetch operations. You need to use an override suffix when you use the |
| variable (e.g. ``FETCHCMD_git`` or ``FETCHCMD_svn``). |
| |
| :term:`FILE` |
| Points at the current file. BitBake sets this variable during the |
| parsing process to identify the file being parsed. BitBake also sets |
| this variable when a recipe is being executed to identify the recipe |
| file. |
| |
| :term:`FILESPATH` |
| Specifies directories BitBake uses when searching for patches and |
| files. The "local" fetcher module uses these directories when |
| handling ``file://`` URLs. The variable behaves like a shell ``PATH`` |
| environment variable. The value is a colon-separated list of |
| directories that are searched left-to-right in order. |
| |
| :term:`GITDIR` |
| The directory in which a local copy of a Git repository is stored |
| when it is cloned. |
| |
| :term:`HGDIR` |
| The directory in which files checked out of a Mercurial system are |
| stored. |
| |
| :term:`HOMEPAGE` |
| Website where more information about the software the recipe is |
| building can be found. |
| |
| :term:`INHERIT` |
| Causes the named class or classes to be inherited globally. Anonymous |
| functions in the class or classes are not executed for the base |
| configuration and in each individual recipe. The OpenEmbedded build |
| system ignores changes to :term:`INHERIT` in individual recipes. |
| |
| For more information on :term:`INHERIT`, see the |
| ":ref:`bitbake-user-manual/bitbake-user-manual-metadata:\`\`inherit\`\` configuration directive`" |
| section. |
| |
| :term:`LAYERDEPENDS` |
| Lists the layers, separated by spaces, upon which this recipe |
| depends. Optionally, you can specify a specific layer version for a |
| dependency by adding it to the end of the layer name with a colon, |
| (e.g. "anotherlayer:3" to be compared against |
| :term:`LAYERVERSION`\ ``_anotherlayer`` in |
| this case). BitBake produces an error if any dependency is missing or |
| the version numbers do not match exactly (if specified). |
| |
| You use this variable in the ``conf/layer.conf`` file. You must also |
| use the specific layer name as a suffix to the variable (e.g. |
| ``LAYERDEPENDS_mylayer``). |
| |
| :term:`LAYERDIR` |
| When used inside the ``layer.conf`` configuration file, this variable |
| provides the path of the current layer. This variable is not |
| available outside of ``layer.conf`` and references are expanded |
| immediately when parsing of the file completes. |
| |
| :term:`LAYERDIR_RE` |
| When used inside the ``layer.conf`` configuration file, this variable |
| provides the path of the current layer, escaped for use in a regular |
| expression (:term:`BBFILE_PATTERN`). This |
| variable is not available outside of ``layer.conf`` and references |
| are expanded immediately when parsing of the file completes. |
| |
| :term:`LAYERVERSION` |
| Optionally specifies the version of a layer as a single number. You |
| can use this variable within |
| :term:`LAYERDEPENDS` for another layer in |
| order to depend on a specific version of the layer. |
| |
| You use this variable in the ``conf/layer.conf`` file. You must also |
| use the specific layer name as a suffix to the variable (e.g. |
| ``LAYERDEPENDS_mylayer``). |
| |
| :term:`LICENSE` |
| The list of source licenses for the recipe. |
| |
| :term:`MIRRORS` |
| Specifies additional paths from which BitBake gets source code. When |
| the build system searches for source code, it first tries the local |
| download directory. If that location fails, the build system tries |
| locations defined by :term:`PREMIRRORS`, the |
| upstream source, and then locations specified by :term:`MIRRORS` in that |
| order. |
| |
| :term:`MULTI_PROVIDER_WHITELIST` |
| Allows you to suppress BitBake warnings caused when building two |
| separate recipes that provide the same output. |
| |
| BitBake normally issues a warning when building two different recipes |
| where each provides the same output. This scenario is usually |
| something the user does not want. However, cases do exist where it |
| makes sense, particularly in the ``virtual/*`` namespace. You can use |
| this variable to suppress BitBake's warnings. |
| |
| To use the variable, list provider names (e.g. recipe names, |
| ``virtual/kernel``, and so forth). |
| |
| :term:`OVERRIDES` |
| BitBake uses :term:`OVERRIDES` to control what variables are overridden |
| after BitBake parses recipes and configuration files. |
| |
| Following is a simple example that uses an overrides list based on |
| machine architectures: OVERRIDES = "arm:x86:mips:powerpc" You can |
| find information on how to use :term:`OVERRIDES` in the |
| ":ref:`bitbake-user-manual/bitbake-user-manual-metadata:conditional syntax |
| (overrides)`" section. |
| |
| :term:`P4DIR` |
| The directory in which a local copy of a Perforce depot is stored |
| when it is fetched. |
| |
| :term:`PACKAGES` |
| The list of packages the recipe creates. |
| |
| :term:`PACKAGES_DYNAMIC` |
| A promise that your recipe satisfies runtime dependencies for |
| optional modules that are found in other recipes. |
| :term:`PACKAGES_DYNAMIC` does not actually satisfy the dependencies, it |
| only states that they should be satisfied. For example, if a hard, |
| runtime dependency (:term:`RDEPENDS`) of another |
| package is satisfied during the build through the |
| :term:`PACKAGES_DYNAMIC` variable, but a package with the module name is |
| never actually produced, then the other package will be broken. |
| |
| :term:`PE` |
| The epoch of the recipe. By default, this variable is unset. The |
| variable is used to make upgrades possible when the versioning scheme |
| changes in some backwards incompatible way. |
| |
| :term:`PERSISTENT_DIR` |
| Specifies the directory BitBake uses to store data that should be |
| preserved between builds. In particular, the data stored is the data |
| that uses BitBake's persistent data API and the data used by the PR |
| Server and PR Service. |
| |
| :term:`PF` |
| Specifies the recipe or package name and includes all version and |
| revision numbers (i.e. ``eglibc-2.13-r20+svnr15508/`` and |
| ``bash-4.2-r1/``). |
| |
| :term:`PN` |
| The recipe name. |
| |
| :term:`PR` |
| The revision of the recipe. |
| |
| :term:`PREFERRED_PROVIDER` |
| Determines which recipe should be given preference when multiple |
| recipes provide the same item. You should always suffix the variable |
| with the name of the provided item, and you should set it to the |
| :term:`PN` of the recipe to which you want to give |
| precedence. Some examples:: |
| |
| PREFERRED_PROVIDER_virtual/kernel ?= "linux-yocto" |
| PREFERRED_PROVIDER_virtual/xserver = "xserver-xf86" |
| PREFERRED_PROVIDER_virtual/libgl ?= "mesa" |
| |
| :term:`PREFERRED_PROVIDERS` |
| Determines which recipe should be given preference for cases where |
| multiple recipes provide the same item. Functionally, |
| :term:`PREFERRED_PROVIDERS` is identical to |
| :term:`PREFERRED_PROVIDER`. However, the :term:`PREFERRED_PROVIDERS` variable |
| lets you define preferences for multiple situations using the following |
| form:: |
| |
| PREFERRED_PROVIDERS = "xxx:yyy aaa:bbb ..." |
| |
| This form is a convenient replacement for the following:: |
| |
| PREFERRED_PROVIDER_xxx = "yyy" |
| PREFERRED_PROVIDER_aaa = "bbb" |
| |
| :term:`PREFERRED_VERSION` |
| If there are multiple versions of a recipe available, this variable |
| determines which version should be given preference. You must always |
| suffix the variable with the :term:`PN` you want to |
| select, and you should set :term:`PV` accordingly for |
| precedence. |
| |
| The :term:`PREFERRED_VERSION` variable supports limited wildcard use |
| through the "``%``" character. You can use the character to match any |
| number of characters, which can be useful when specifying versions |
| that contain long revision numbers that potentially change. Here are |
| two examples:: |
| |
| PREFERRED_VERSION_python = "2.7.3" |
| PREFERRED_VERSION_linux-yocto = "4.12%" |
| |
| .. important:: |
| |
| The use of the " % " character is limited in that it only works at the |
| end of the string. You cannot use the wildcard character in any other |
| location of the string. |
| |
| If a recipe with the specified version is not available, a warning |
| message will be shown. See :term:`REQUIRED_VERSION` if you want this |
| to be an error instead. |
| |
| :term:`PREMIRRORS` |
| Specifies additional paths from which BitBake gets source code. When |
| the build system searches for source code, it first tries the local |
| download directory. If that location fails, the build system tries |
| locations defined by :term:`PREMIRRORS`, the upstream source, and then |
| locations specified by :term:`MIRRORS` in that order. |
| |
| Typically, you would add a specific server for the build system to |
| attempt before any others by adding something like the following to |
| your configuration:: |
| |
| PREMIRRORS:prepend = "\ |
| git://.*/.* http://www.yoctoproject.org/sources/ \n \ |
| ftp://.*/.* http://www.yoctoproject.org/sources/ \n \ |
| http://.*/.* http://www.yoctoproject.org/sources/ \n \ |
| https://.*/.* http://www.yoctoproject.org/sources/ \n" |
| |
| These changes cause the build system to intercept Git, FTP, HTTP, and |
| HTTPS requests and direct them to the ``http://`` sources mirror. You can |
| use ``file://`` URLs to point to local directories or network shares as |
| well. |
| |
| :term:`PROVIDES` |
| A list of aliases by which a particular recipe can be known. By |
| default, a recipe's own :term:`PN` is implicitly already in its |
| :term:`PROVIDES` list. If a recipe uses :term:`PROVIDES`, the additional |
| aliases are synonyms for the recipe and can be useful satisfying |
| dependencies of other recipes during the build as specified by |
| :term:`DEPENDS`. |
| |
| Consider the following example :term:`PROVIDES` statement from a recipe |
| file ``libav_0.8.11.bb``:: |
| |
| PROVIDES += "libpostproc" |
| |
| The :term:`PROVIDES` statement results in the "libav" recipe also being known |
| as "libpostproc". |
| |
| In addition to providing recipes under alternate names, the |
| :term:`PROVIDES` mechanism is also used to implement virtual targets. A |
| virtual target is a name that corresponds to some particular |
| functionality (e.g. a Linux kernel). Recipes that provide the |
| functionality in question list the virtual target in :term:`PROVIDES`. |
| Recipes that depend on the functionality in question can include the |
| virtual target in :term:`DEPENDS` to leave the |
| choice of provider open. |
| |
| Conventionally, virtual targets have names on the form |
| "virtual/function" (e.g. "virtual/kernel"). The slash is simply part |
| of the name and has no syntactical significance. |
| |
| :term:`PRSERV_HOST` |
| The network based :term:`PR` service host and port. |
| |
| Following is an example of how the :term:`PRSERV_HOST` variable is set:: |
| |
| PRSERV_HOST = "localhost:0" |
| |
| You must set the variable if you want to automatically start a local PR |
| service. You can set :term:`PRSERV_HOST` to other values to use a remote PR |
| service. |
| |
| :term:`PV` |
| The version of the recipe. |
| |
| :term:`RDEPENDS` |
| Lists a package's runtime dependencies (i.e. other packages) that |
| must be installed in order for the built package to run correctly. If |
| a package in this list cannot be found during the build, you will get |
| a build error. |
| |
| Because the :term:`RDEPENDS` variable applies to packages being built, |
| you should always use the variable in a form with an attached package |
| name. For example, suppose you are building a development package |
| that depends on the ``perl`` package. In this case, you would use the |
| following :term:`RDEPENDS` statement:: |
| |
| RDEPENDS:${PN}-dev += "perl" |
| |
| In the example, the development package depends on the ``perl`` package. |
| Thus, the :term:`RDEPENDS` variable has the ``${PN}-dev`` package name as part |
| of the variable. |
| |
| BitBake supports specifying versioned dependencies. Although the |
| syntax varies depending on the packaging format, BitBake hides these |
| differences from you. Here is the general syntax to specify versions |
| with the :term:`RDEPENDS` variable:: |
| |
| RDEPENDS:${PN} = "package (operator version)" |
| |
| For ``operator``, you can specify the following:: |
| |
| = |
| < |
| > |
| <= |
| >= |
| |
| For example, the following sets up a dependency on version 1.2 or |
| greater of the package ``foo``:: |
| |
| RDEPENDS:${PN} = "foo (>= 1.2)" |
| |
| For information on build-time dependencies, see the :term:`DEPENDS` |
| variable. |
| |
| :term:`REPODIR` |
| The directory in which a local copy of a ``google-repo`` directory is |
| stored when it is synced. |
| |
| :term:`REQUIRED_VERSION` |
| If there are multiple versions of a recipe available, this variable |
| determines which version should be given preference. :term:`REQUIRED_VERSION` |
| works in exactly the same manner as :term:`PREFERRED_VERSION`, except |
| that if the specified version is not available then an error message |
| is shown and the build fails immediately. |
| |
| If both :term:`REQUIRED_VERSION` and :term:`PREFERRED_VERSION` are set for |
| the same recipe, the :term:`REQUIRED_VERSION` value applies. |
| |
| :term:`RPROVIDES` |
| A list of package name aliases that a package also provides. These |
| aliases are useful for satisfying runtime dependencies of other |
| packages both during the build and on the target (as specified by |
| :term:`RDEPENDS`). |
| |
| As with all package-controlling variables, you must always use the |
| variable in conjunction with a package name override. Here is an |
| example:: |
| |
| RPROVIDES:${PN} = "widget-abi-2" |
| |
| :term:`RRECOMMENDS` |
| A list of packages that extends the usability of a package being |
| built. The package being built does not depend on this list of |
| packages in order to successfully build, but needs them for the |
| extended usability. To specify runtime dependencies for packages, see |
| the :term:`RDEPENDS` variable. |
| |
| BitBake supports specifying versioned recommends. Although the syntax |
| varies depending on the packaging format, BitBake hides these |
| differences from you. Here is the general syntax to specify versions |
| with the :term:`RRECOMMENDS` variable:: |
| |
| RRECOMMENDS:${PN} = "package (operator version)" |
| |
| For ``operator``, you can specify the following:: |
| |
| = |
| < |
| > |
| <= |
| >= |
| |
| For example, the following sets up a recommend on version |
| 1.2 or greater of the package ``foo``:: |
| |
| RRECOMMENDS:${PN} = "foo (>= 1.2)" |
| |
| :term:`SECTION` |
| The section in which packages should be categorized. |
| |
| :term:`SRC_URI` |
| The list of source files - local or remote. This variable tells |
| BitBake which bits to pull for the build and how to pull them. For |
| example, if the recipe or append file needs to fetch a single tarball |
| from the Internet, the recipe or append file uses a :term:`SRC_URI` entry |
| that specifies that tarball. On the other hand, if the recipe or |
| append file needs to fetch a tarball and include a custom file, the |
| recipe or append file needs an :term:`SRC_URI` variable that specifies |
| all those sources. |
| |
| The following list explains the available URI protocols: |
| |
| - ``file://`` : Fetches files, which are usually files shipped |
| with the metadata, from the local machine. The path is relative to |
| the :term:`FILESPATH` variable. |
| |
| - ``bzr://`` : Fetches files from a Bazaar revision control |
| repository. |
| |
| - ``git://`` : Fetches files from a Git revision control |
| repository. |
| |
| - ``osc://`` : Fetches files from an OSC (OpenSUSE Build service) |
| revision control repository. |
| |
| - ``repo://`` : Fetches files from a repo (Git) repository. |
| |
| - ``http://`` : Fetches files from the Internet using HTTP. |
| |
| - ``https://`` : Fetches files from the Internet using HTTPS. |
| |
| - ``ftp://`` : Fetches files from the Internet using FTP. |
| |
| - ``cvs://`` : Fetches files from a CVS revision control |
| repository. |
| |
| - ``hg://`` : Fetches files from a Mercurial (``hg``) revision |
| control repository. |
| |
| - ``p4://`` : Fetches files from a Perforce (``p4``) revision |
| control repository. |
| |
| - ``ssh://`` : Fetches files from a secure shell. |
| |
| - ``svn://`` : Fetches files from a Subversion (``svn``) revision |
| control repository. |
| |
| - ``az://`` : Fetches files from an Azure Storage account using HTTPS. |
| |
| Here are some additional options worth mentioning: |
| |
| - ``unpack`` : Controls whether or not to unpack the file if it is |
| an archive. The default action is to unpack the file. |
| |
| - ``subdir`` : Places the file (or extracts its contents) into the |
| specified subdirectory. This option is useful for unusual tarballs |
| or other archives that do not have their files already in a |
| subdirectory within the archive. |
| |
| - ``name`` : Specifies a name to be used for association with |
| :term:`SRC_URI` checksums when you have more than one file specified |
| in :term:`SRC_URI`. |
| |
| - ``downloadfilename`` : Specifies the filename used when storing |
| the downloaded file. |
| |
| :term:`SRCDATE` |
| The date of the source code used to build the package. This variable |
| applies only if the source was fetched from a Source Code Manager |
| (SCM). |
| |
| :term:`SRCREV` |
| The revision of the source code used to build the package. This |
| variable applies only when using Subversion, Git, Mercurial and |
| Bazaar. If you want to build a fixed revision and you want to avoid |
| performing a query on the remote repository every time BitBake parses |
| your recipe, you should specify a :term:`SRCREV` that is a full revision |
| identifier and not just a tag. |
| |
| :term:`SRCREV_FORMAT` |
| Helps construct valid :term:`SRCREV` values when |
| multiple source controlled URLs are used in |
| :term:`SRC_URI`. |
| |
| The system needs help constructing these values under these |
| circumstances. Each component in the :term:`SRC_URI` is assigned a name |
| and these are referenced in the :term:`SRCREV_FORMAT` variable. Consider |
| an example with URLs named "machine" and "meta". In this case, |
| :term:`SRCREV_FORMAT` could look like "machine_meta" and those names |
| would have the SCM versions substituted into each position. Only one |
| ``AUTOINC`` placeholder is added and if needed. And, this placeholder |
| is placed at the start of the returned string. |
| |
| :term:`STAMP` |
| Specifies the base path used to create recipe stamp files. The path |
| to an actual stamp file is constructed by evaluating this string and |
| then appending additional information. |
| |
| :term:`STAMPCLEAN` |
| Specifies the base path used to create recipe stamp files. Unlike the |
| :term:`STAMP` variable, :term:`STAMPCLEAN` can contain |
| wildcards to match the range of files a clean operation should |
| remove. BitBake uses a clean operation to remove any other stamps it |
| should be removing when creating a new stamp. |
| |
| :term:`SUMMARY` |
| A short summary for the recipe, which is 72 characters or less. |
| |
| :term:`SVNDIR` |
| The directory in which files checked out of a Subversion system are |
| stored. |
| |
| :term:`T` |
| Points to a directory were BitBake places temporary files, which |
| consist mostly of task logs and scripts, when building a particular |
| recipe. |
| |
| :term:`TOPDIR` |
| Points to the build directory. BitBake automatically sets this |
| variable. |