classes: Fix alternatives and rc.d ordering

When using an alternative as an initscript, the ordering between
update-rc.d and update-alternatives tasks during prerm and postinst
tasks must always be the following in order to work:
  * prerm:
    - stop daemon
    - remove alternative

  * postinst:
    - add alternative
    - start daemon

This patchset adds comments to the scripts generated by both classes and
organize the generated sections based on those comments.

[YOCTO #10433]

Changes since v5:
    - Remove boolean in d.getVar() calls

Signed-off-by: David Vincent <freesilicon@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

1 files changed, 22 insertions, 7 deletions

diff --git a/meta/classes/update-alternatives.bbclass b/meta/classes/update-alternatives.bbclass
index 0460bf0241..a90ef19e45 100644
--- a/meta/classes/update-alternatives.bbclass
+++ b/meta/classes/update-alternatives.bbclass
@@ -195,8 +195,8 @@ python populate_packages_updatealternatives () {
     pkgdest = d.getVar('PKGD')
     for pkg in (d.getVar('PACKAGES') or "").split():
         # Create post install/removal scripts
-        alt_setup_links = ""
-        alt_remove_links = ""
+        alt_setup_links = "# Begin section update-alternatives\n"
+        alt_remove_links = "# Begin section update-alternatives\n"
         for alt_name in (d.getVar('ALTERNATIVE_%s' % pkg) or "").split():
             alt_link     = d.getVarFlag('ALTERNATIVE_LINK_NAME', alt_name)
             alt_target   = d.getVarFlag('ALTERNATIVE_TARGET_%s' % pkg, alt_name) or d.getVarFlag('ALTERNATIVE_TARGET', alt_name)
@@ -219,10 +219,13 @@ python populate_packages_updatealternatives () {
             # Default to generate shell script.. eventually we may want to change this...
             alt_target = os.path.normpath(alt_target)
 
-            alt_setup_links  += '\tupdate-alternatives --install %s %s %s %s\n' % (alt_link, alt_name, alt_target, alt_priority)
-            alt_remove_links += '\tupdate-alternatives --remove  %s %s\n' % (alt_name, alt_target)
+            alt_setup_links  += 'update-alternatives --install %s %s %s %s\n' % (alt_link, alt_name, alt_target, alt_priority)
+            alt_remove_links += 'update-alternatives --remove  %s %s\n' % (alt_name, alt_target)
 
-        if alt_setup_links:
+        alt_setup_links += "# End section update-alternatives\n"
+        alt_remove_links += "# End section update-alternatives\n"
+
+        if len(alt_setup_links.splitlines()) > 2:
             # RDEPENDS setup
             provider = d.getVar('VIRTUAL-RUNTIME_update-alternatives')
             if provider:
@@ -232,12 +235,24 @@ python populate_packages_updatealternatives () {
             bb.note('adding update-alternatives calls to postinst/prerm for %s' % pkg)
             bb.note('%s' % alt_setup_links)
             postinst = d.getVar('pkg_postinst_%s' % pkg) or '#!/bin/sh\n'
-            postinst += alt_setup_links
+            postinst = postinst.splitlines(True)
+            try:
+                index = postinst.index('# Begin section update-rc.d\n')
+                postinst.insert(index, alt_setup_links)
+            except ValueError:
+                postinst.append(alt_setup_links)
+            postinst = ''.join(postinst)
             d.setVar('pkg_postinst_%s' % pkg, postinst)
 
             bb.note('%s' % alt_remove_links)
             prerm = d.getVar('pkg_prerm_%s' % pkg) or '#!/bin/sh\n'
-            prerm += alt_remove_links
+            prerm = prerm.splitlines(True)
+            try:
+                index = prerm.index('# End section update-rc.d\n')
+                prerm.insert(index + 1, alt_remove_links)
+            except ValueError:
+                prerm.append(alt_remove_links)
+            prerm = ''.join(prerm)
             d.setVar('pkg_prerm_%s' % pkg, prerm)
 }