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authorKevin Tian <kevin.tian@intel.com>2010-09-25 14:54:44 +0800
committerRichard Purdie <rpurdie@linux.intel.com>2010-09-29 16:42:15 +0100
commit22cbcd964fceb43c89142be77db8950425b4303e (patch)
tree34879ea75a7e06fddd6c174820ec3f715d72abdf /meta/classes/update-alternatives.bbclass
parent5f289ac80f81681f1d31e8637ceeeb5217aa40ca (diff)
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update-alternative.bbclass: add batch alternatives support
With new batch ability, we can use below simple 2 lines for multiple alternatives updates: ALTERNATIVE_LINKS = "${bindir}/cmd1 {sbindir}/cmd2 ..." ALTERNATIVE_PRIORITY = "100" Then for each command "/path/cmd" listed in ALTERNATIVE_LINKS, below is done automatically: ${D}/path/cmd is renamed to ${D}/path/cmd.{PN} a new alternative named 'cmd' is created which: links /path/cmd to /path/cmd.{PN} with priority specified in ALTERNATIVE_PRIORITY This way the recipe with multiple alternatives could be simplified a lot. There are still some cases where above assumptions may break, but I expect more recipes should benefit from this simple enhancement Fix [BUGID #257] Signed-off-by: Kevin Tian <kevin.tian@intel.com>
Diffstat (limited to 'meta/classes/update-alternatives.bbclass')
-rw-r--r--meta/classes/update-alternatives.bbclass83
1 files changed, 81 insertions, 2 deletions
diff --git a/meta/classes/update-alternatives.bbclass b/meta/classes/update-alternatives.bbclass
index ddbf4c1947..fdb4214b65 100644
--- a/meta/classes/update-alternatives.bbclass
+++ b/meta/classes/update-alternatives.bbclass
@@ -1,3 +1,41 @@
+# This class is used to help the alternatives system which is useful when
+# multiple sources provide same command. You can use update-alternatives
+# command directly in your recipe, but in most cases this class simplifies
+# that job.
+#
+# There're two basic modes supported: 'single update' and 'batch update'
+#
+# 'single update' is used for a single alternative command, and you're
+# expected to provide at least below keywords:
+#
+# ALTERNATIVE_NAME - the name that the alternative is registered
+# ALTERNATIVE_PATH - the path of installed alternative
+#
+# ALTENATIVE_PRIORITY and ALTERNATIVE_LINK are optional which have defautls
+# in this class.
+#
+# 'batch update' is used if you have multiple alternatives to be updated.
+# Unlike 'single update', 'batch update' in most times only require two
+# parameter:
+#
+# ALTERNATIVE_LINKS - a list of symbol links for which you'd like to
+# create alternatives, with space as delimiter, e.g:
+#
+# ALTERNATIVE_LINKS = "${bindir}/cmd1 ${sbindir}/cmd2 ..."
+#
+# ALTNERATIVE_PRIORITY - optional, applies to all
+#
+# To simplify the design, this class has the assumption that for a name
+# listed in ALTERNATIVE_LINKS, say /path/cmd:
+#
+# the name of the alternative would be: cmd
+# the path of installed alternative would be: /path/cmd.${PN}
+# ${D}/path/cmd will be renamed to ${D}/path/cmd.{PN} automatically
+# priority will be the same from ALTERNATIVE_PRIORITY
+#
+# If above assumption breaks your requirement, then you still need to use
+# your own update-alternatives command directly.
+
# defaults
ALTERNATIVE_PRIORITY = "10"
ALTERNATIVE_LINK = "${bindir}/${ALTERNATIVE_NAME}"
@@ -10,7 +48,42 @@ update_alternatives_postrm() {
update-alternatives --remove ${ALTERNATIVE_NAME} ${ALTERNATIVE_PATH}
}
+# for batch alternatives, we use a simple approach to require only one parameter
+# with the rest info deduced implicitly
+update_alternatives_batch_postinst() {
+for link in ${ALTERNATIVE_LINKS}
+do
+ name=`basename ${link}`
+ path=${link}.${PN}
+ update-alternatives --install ${link} ${name} ${path} ${ALTERNATIVE_PRIORITY}
+done
+}
+
+update_alternatives_batch_postrm() {
+for link in ${ALTERNATIVE_LINKS}
+do
+ name=`basename ${link}`
+ path=${link}.${PN}
+ update-alternatives --remove ${name} $path
+done
+}
+
+update_alternatives_batch_doinstall() {
+if [ "${PN}" = "${BPN}" ] ; then
+ for link in ${ALTERNATIVE_LINKS}
+ do
+ mv ${D}${link} ${D}${link}.${PN}
+ done
+fi
+}
+
def update_alternatives_after_parse(d):
+ if bb.data.getVar('ALTERNATIVE_LINKS', d) != None:
+ doinstall = bb.data.getVar('do_install', d, 1)
+ doinstall += bb.data.getVar('update_alternatives_batch_doinstall', d, 1)
+ bb.data.setVar('do_install', doinstall, d)
+ return
+
if bb.data.getVar('ALTERNATIVE_NAME', d) == None:
raise bb.build.FuncFailed, "%s inherits update-alternatives but doesn't set ALTERNATIVE_NAME" % bb.data.getVar('FILE', d)
if bb.data.getVar('ALTERNATIVE_PATH', d) == None:
@@ -26,11 +99,17 @@ python populate_packages_prepend () {
postinst = bb.data.getVar('pkg_postinst_%s' % pkg, d, 1) or bb.data.getVar('pkg_postinst', d, 1)
if not postinst:
postinst = '#!/bin/sh\n'
- postinst += bb.data.getVar('update_alternatives_postinst', d, 1)
+ if bb.data.getVar('ALTERNATIVE_LINKS', d) != None:
+ postinst += bb.data.getVar('update_alternatives_batch_postinst', d, 1)
+ else:
+ postinst += bb.data.getVar('update_alternatives_postinst', d, 1)
bb.data.setVar('pkg_postinst_%s' % pkg, postinst, d)
postrm = bb.data.getVar('pkg_postrm_%s' % pkg, d, 1) or bb.data.getVar('pkg_postrm', d, 1)
if not postrm:
postrm = '#!/bin/sh\n'
- postrm += bb.data.getVar('update_alternatives_postrm', d, 1)
+ if bb.data.getVar('ALTERNATIVE_LINKS', d) != None:
+ postrm += bb.data.getVar('update_alternatives_batch_postrm', d, 1)
+ else:
+ postrm += bb.data.getVar('update_alternatives_postrm', d, 1)
bb.data.setVar('pkg_postrm_%s' % pkg, postrm, d)
}