[PATCH] classes: Fix alternatives and rc.d ordering

[David Vincent <freesilicon@gmail.com>]

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]

Signed-off-by: David Vincent <freesilicon@gmail.com>
---
 meta/classes/update-alternatives.bbclass | 29 ++++++++++++++++++++++-------
 meta/classes/update-rc.d.bbclass         | 20 ++++++++++++++++++--
 2 files changed, 40 insertions(+), 9 deletions(-)

diff --git a/meta/classes/update-alternatives.bbclass b/meta/classes/update-alternatives.bbclass
index 1fdd681..65929e5 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', True)
     for pkg in (d.getVar('PACKAGES', True) 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, True) or "").split():
             alt_link     = d.getVarFlag('ALTERNATIVE_LINK_NAME', alt_name, True)
             alt_target   = d.getVarFlag('ALTERNATIVE_TARGET_%s' % pkg, alt_name, True) or d.getVarFlag('ALTERNATIVE_TARGET', alt_name, True)
@@ -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', True)
             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, True) 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, True) 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)
 }
 
diff --git a/meta/classes/update-rc.d.bbclass b/meta/classes/update-rc.d.bbclass
index 321924b..18df2dc 100644
--- a/meta/classes/update-rc.d.bbclass
+++ b/meta/classes/update-rc.d.bbclass
@@ -26,6 +26,7 @@ fi
 }
 
 updatercd_postinst() {
+# Begin section update-rc.d
 if type update-rc.d >/dev/null 2>/dev/null; then
 	if [ -n "$D" ]; then
 		OPT="-r $D"
@@ -34,12 +35,15 @@ if type update-rc.d >/dev/null 2>/dev/null; then
 	fi
 	update-rc.d $OPT ${INITSCRIPT_NAME} ${INITSCRIPT_PARAMS}
 fi
+# End section update-rc.d
 }
 
 updatercd_prerm() {
+# Begin section update-rc.d
 if [ -z "$D" -a -x "${INIT_D_DIR}/${INITSCRIPT_NAME}" ]; then
 	${INIT_D_DIR}/${INITSCRIPT_NAME} stop || :
 fi
+# End section update-rc.d
 }
 
 updatercd_postrm() {
@@ -102,13 +106,25 @@ python populate_packages_updatercd () {
         postinst = d.getVar('pkg_postinst_%s' % pkg, True)
         if not postinst:
             postinst = '#!/bin/sh\n'
-        postinst += localdata.getVar('updatercd_postinst', True)
+        postinst = postinst.splitlines(True)
+        try:
+            index = postinst.index('# End section update-alternatives\n')
+            postinst.insert(index + 1, localdata.getVar('updatercd_postinst', True))
+        except ValueError:
+            postinst.append(localdata.getVar('updatercd_postinst', True))
+        postinst = ''.join(postinst)
         d.setVar('pkg_postinst_%s' % pkg, postinst)
 
         prerm = d.getVar('pkg_prerm_%s' % pkg, True)
         if not prerm:
             prerm = '#!/bin/sh\n'
-        prerm += localdata.getVar('updatercd_prerm', True)
+        prerm = prerm.splitlines(True)
+        try:
+            index = prerm.index('# Begin section update-alternatives\n')
+            prerm.insert(index, localdata.getVar('updatercd_prerm', True))
+        except ValueError:
+            prerm.append(localdata.getVar('updatercd_prerm', True))
+        prerm = ''.join(prerm)
         d.setVar('pkg_prerm_%s' % pkg, prerm)
 
         postrm = d.getVar('pkg_postrm_%s' % pkg, True)
-- 
2.10.2