| 468 | | - `registry_active` takes a port name as argument and returns a list of matching active ports. It is defined in code:trunk/base/src/macports1.0/macports.tcl as an alias of `registry::active`. While it might seem odd that it returns a list, it makes sense if you know that it will return a list of all active ports when called with an empty argument. |
| 469 | | - `registry::active` is defined in code:trunk/base/src/registry2.0/registry.tcl. The only relevant case (since we're all using the SQLite registry by now) forwards the call to `receipt_sqlite::active` (in code:trunk/base/src/registry2.0/receipt_sqlite.tcl), where it queries all matching ports using `registry::entry installed $name` (which is defined as `entry_installed` in code:trunk/base/src/registry2.0/entry.c, if you want to dig in). It then converts the returned list of registry entry objects to a Tcl list using the following line of code (which is the reason why we've been digging through the code): |
| 470 | | |
| | 468 | * `registry_active` takes a port name as argument and returns a list of matching active ports. It is defined in source:trunk/base/src/macports1.0/macports.tcl as an alias of `registry::active`. While it might seem odd that it returns a list, it makes sense if you know that it will return a list of all active ports when called with an empty argument. |
| | 469 | * `registry::active` is defined in source:trunk/base/src/registry2.0/registry.tcl. The only relevant case (since we're all using the SQLite registry by now) forwards the call to `receipt_sqlite::active` (in source:trunk/base/src/registry2.0/receipt_sqlite.tcl), where it queries all matching ports using `registry::entry installed $name` (which is defined as `entry_installed` in source:trunk/base/src/registry2.0/entry.c, if you want to dig in). It then converts the returned list of registry entry objects to a Tcl list using the following line of code (which is the reason why we've been digging through the code): |
| | 470 | {{{ |
| 475 | | |
| 476 | | - Index 0: name of the port |
| 477 | | - Index 1: port version |
| 478 | | - Index 2: port revision |
| 479 | | - Index 3: port variants (this is what the active_variants PortGroup uses!) |
| 480 | | - Index 4: 1, if the port is installed, 0 otherwise |
| 481 | | - Index 5: port epoch |
| 482 | | - From this journey into MacPorts internals, we know that `registry_active` will return a list, but in our case it will always only contain one element. We can strip the outer list using `[lindex $returnval_of_registry_active 0]`. |
| 483 | | - Because `registry_active` will raise an error if the port requested is not active, we need to wrap it in a catch statement. If catch returns 0 (i.e., no error occured), we know the port in question is active. |
| 484 | | - In the example above, we retrieve the version of `kerberos5` (from index 1) and check using `vercmp` whether it is lower than 1.11. If it is, we need to deactivate the `kerberos5` port. |
| 485 | | - To do that, we can use `registry_deactivate_composite` (and you can probably guess that this is an alias, too, and where you can find it). `registry_deactivate_composite $name "" $options` is a shorthand for `registry_deactivate $name "" "" 0 $options` and will deactivate the port indicated by `$name`. The second argument is a version number, which we can leave empty in this case. If we would normally try to deactivate `kerberos5` it might fail, because other ports might still depend on `kerberos5` being present. Since we know that it will be reinstalled soon anyway, we can just force deactivation without paying respect to the dependent ports (which we do by passing `[list ports_nodepcheck 1]` as `$options` argument. |
| | 475 | This snippet tells us which values can be found at which offsets in the (second level) list returned by `registry_active` to the Portfile: |
| | 476 | - Index 0: name of the port |
| | 477 | - Index 1: port version |
| | 478 | - Index 2: port revision |
| | 479 | - Index 3: port variants (this is what the active_variants PortGroup uses!) |
| | 480 | - Index 4: 1, if the port is installed, 0 otherwise |
| | 481 | - Index 5: port epoch |
| | 482 | * From this journey into MacPorts internals, we know that `registry_active` will return a list, but in our case it will always only contain one element. We can strip the outer list using `[lindex $returnval_of_registry_active 0]`. |
| | 483 | * Because `registry_active` will raise an error if the port requested is not active, we need to wrap it in a catch statement. If catch returns 0 (i.e., no error occured), we know the port in question is active. |
| | 484 | * In the example above, we retrieve the version of `kerberos5` (from index 1) and check using `vercmp` whether it is lower than 1.11. If it is, we need to deactivate the `kerberos5` port. |
| | 485 | * To do that, we can use `registry_deactivate_composite` (and you can probably guess that this is an alias, too, and where you can find it). `registry_deactivate_composite $name "" $options` is a shorthand for `registry_deactivate $name "" "" 0 $options` and will deactivate the port indicated by `$name`. The second argument is a version number, which we can leave empty in this case. If we would normally try to deactivate `kerberos5` it might fail, because other ports might still depend on `kerberos5` being present. Since we know that it will be reinstalled soon anyway, we can just force deactivation without paying respect to the dependent ports (which we do by passing `[list ports_nodepcheck 1]` as `$options` argument. |
