diff options
Diffstat (limited to 'general-concepts')
| -rw-r--r-- | general-concepts/dependencies/text.xml | 31 |
1 files changed, 23 insertions, 8 deletions
diff --git a/general-concepts/dependencies/text.xml b/general-concepts/dependencies/text.xml index 18fcefd..f83506a 100644 --- a/general-concepts/dependencies/text.xml +++ b/general-concepts/dependencies/text.xml @@ -209,19 +209,35 @@ asterisk. Also note that when selecting all versions in a specific <body> <p> -Sometimes two packages cannot be installed in parallel. This is handled by -blockers. A softblocker is specified as follows: +When two packages (package slots, versions) can not be installed +simultaneously, blockers can be used to expose such a conflict +to the package manager. </p> +<p> +There are two kinds of blockers: soft blockers and hard blockers. +</p> + +<p>A soft blocker is defined using the following syntax:</p> + <codesample lang="ebuild"> RDEPEND="!app-misc/foo" </codesample> <p> -Portage will try to resolve this conflict automatically if possible. -Sometimes we need to use a hardblocker to ensure correct emerge order. -Those cannot be resolved by Portage and must be taken care of by the user. -A hardblocker is specified as follows: +The package manager will try to resolve this conflict automatically. +The package blocked by a soft blocker can be uninstalled <e>after</e> +installing the package blocking it. However, it exempts the common +files from file collision checks. Soft blockers are usually used +to solve file collisions between packages and are meaningful only +in <c>RDEPEND</c>. +</p> + +<p> +If it is strictly necessary to resolve the blocker before the package +is built (installed) or if automatic resolution is undesired, +a hard blocker must be used instead. Hard blockers are not resolved +automatically, and are expressed using the following syntax: </p> <codesample lang="ebuild"> @@ -229,8 +245,7 @@ RDEPEND="!!app-misc/foo" </codesample> <p> -Hardblockers always take precedence over softblockers and need at least EAPI=2. -Also note that blockers are usually <e>runtime</e> rather than buildtime. +Hard blocks require EAPI 2 or newer. </p> <p> |