System properties

platform (plat), platformLE (plat), platformLT (plat), platformGE (plat), platformGT (plat)

platform lets you make requirements on the basic system architecture. Typical examples are

platform('linux-redhat-7.3')  # require RedHat Linux version 7.3
#
#- Require RedHat version 7.3-9 or any version of cygwin
#
{ platformGE('linux-redhat-7.3'); platformLT('linux-redhat-9') OR platformGE('cygwin') } 

You can get a list of supported platforms by doing % pacman -platforms.

tcpPorts (host, portStart, portEnd)

tcpPorts lets you require internet connectivity to host with port range as indicated. The test for connectivity is done once at installation time.

usePort (port)

usePort tries binding a socket to integer port number port as part of the installation. If this succeed, the condition is satisfied. The test is repeated when -verify is used.

rpm (filename), rpmInstalled (filename)

rpm and rpmInstalled let you install an rpm as part of an installation procedure (rpm) or test if an rpm is already installed (rpmInstalled). As with all Pacman operations, if Pacman installs an rpm for you when a package is installed, it will also remove it when the package is uninstalled.

heapSize (bytes), stackSize (bytes), imageSize (bytes)

These atoms test the maximum memory sizes on the installing system. imageSize (bytes) guarantees that a image with size at least bytes can be run.

fileSizeSoft (bytes), fileSizeHard (bytes), fileSize (bytes)

These atoms test maximum allowed file sizes on a system. fileSize (bytes) guarantees that a file with size at least bytes can be created.

timeErrorMaximum (seconds)

timeErrorMaximum requires that the system clock on the installing system to be accurate to within seconds seconds specified as a floating point number. This is typically important for distributed computing or grid applications. The absolute time measurement for timeErrorMaximum is only accurate to about 1 second, so there is no point in being more stringent than that.

downloadTime (FILE, minimumSeconds)

downloadTime is a network performance test. It requires that the FILE (syntax is the same as in download) be downloaded to the installation site within minimumSeconds seconds specified as a floating point number.

cpuSecondsSoft (seconds), cpuSecondsHard (seconds), cpuSeconds (seconds)

Systems sometimes have built in limits on the maximum cpu time a process can used before it is automatically killed. These atoms let you require that such limits are greater than seconds seconds. cpuSeconds requires that the minimum of the soft and hard limits be greater than the seconds argument. As usual, seconds are specified as a floating point number.

openFileDescriptorsSoft (ndesc), openFileDescriptorsHard (ndesc), openFileDescriptors (ndesc)

These atoms test the maximum allowed number of open file descriptors on a system. openFileDescriptors (ndesc) guarantees that at least ndesc file descriptors can be open at once.

runningProcess (processName)

runningProcess requires that processName be a currently running process at the time of installation.

fileCopyMinimumMegsPerSecond (minimumMegsPerSecond [, numberOfMegs [, path='.']])

fileCopyMinimumMegsPerSecond lets you test disk writing speed at the installation machine. This requires that a single file of numberOfMegs (defaults to 1000 Megs) must be able to be copied with a speed of at least minimumMegsPerSecon at location path.

systemWordSize (wordsizestring)

Specify "32" or "64" to determine the system word size.

byteOrder (style)

Specify the system byte order style as in "little".

processor (text)

Specify the system hardware as in "i686".

systemVersion (plat), systemVersionLE (plat), systemVersionLT (plat), systemVersionGE (plat), systemVersionGT (plat)

System version string as returned by the Python platform module.

systemRelease (plat), systemReleaseLE (plat), systemReleaseLT (plat), systemReleaseGE (plat), systemReleaseGT (plat)

System release string as returned by the Python platform module.

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