[PATCH] package_manager.py: add debugging support for rpm scriptlet execution

[Patrick Ohly <patrick.ohly@intel.com>]

By default, smart is invoked with --log-level=warning, which hides all
output from pre/post install scriptlets. That makes it hard to debug
scriptlet failure or why they get postponed to first-boot via
/etc/rpm-postinst.

The new ROOTFS_RPM_DEBUG variabled is expected to be set to an integer in
local.conf an incrementally adds more output:
  0 = default, only warnings
  1 = --log-level=info (includes information about executing scriptlets and their output)
  2 = --log-level=debug
  3 = --log-level=debug plus dumps of scriplet content and command invocation

The default behavior is not changed yet, but it seems that level 1 would
be a better default.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
---
 meta/lib/oe/package_manager.py | 35 ++++++++++++++++++++++++++++++-----
 1 file changed, 30 insertions(+), 5 deletions(-)

diff --git a/meta/lib/oe/package_manager.py b/meta/lib/oe/package_manager.py
index fd9caa3..32afeaf 100644
--- a/meta/lib/oe/package_manager.py
+++ b/meta/lib/oe/package_manager.py
@@ -685,8 +685,16 @@ class RpmPM(PackageManager):
         self.install_dir_path = os.path.join(self.target_rootfs, self.install_dir_name)
         self.rpm_cmd = bb.utils.which(os.getenv('PATH'), "rpm")
         self.smart_cmd = bb.utils.which(os.getenv('PATH'), "smart")
-        self.smart_opt = "--log-level=warning --data-dir=" + os.path.join(target_rootfs,
-                                                      'var/lib/smart')
+        # 0 = default, only warnings
+        # 1 = --log-level=info (includes information about executing scriptlets and their output)
+        # 2 = --log-level=debug
+        # 3 = --log-level=debug plus dumps of scriplet content and command invocation
+        self.debug_level = int(d.getVar('ROOTFS_RPM_DEBUG', True) or "0")
+        self.smart_opt = "--log-level=%s --data-dir=%s" % \
+                         ("warning" if self.debug_level == 0 else
+                          "info" if self.debug_level == 1 else
+                          "debug",
+                          os.path.join(target_rootfs, 'var/lib/smart'))
         self.scriptlet_wrapper = self.d.expand('${WORKDIR}/scriptlet_wrapper')
         self.solution_manifest = self.d.expand('${T}/saved/%s_solution' %
                                                self.task_name)
@@ -1051,6 +1059,17 @@ class RpmPM(PackageManager):
             scriptletcmd = "$2 $1/$3 $4\n"
             scriptpath = "$1/$3"
 
+        # When self.debug_level >= 3, also dump the content of the
+        # executed scriptlets and how they get invoked.  We have to
+        # replace "exit 1" and "ERR" because printing those as-is
+        # would trigger a log analysis failure.
+        if self.debug_level >= 3:
+            dump_invocation = 'echo "Executing ${name} ${kind} with: ' + scriptletcmd + '"\n'
+            dump_script = 'cat ' + scriptpath + '| sed -e "s/exit 1/exxxit 1/g" -e "s/ERR/IRR/g"; echo\n'
+        else:
+            dump_invocation = 'echo "Executing ${name} ${kind}"\n'
+            dump_script = ''
+
         SCRIPTLET_FORMAT = "#!/bin/bash\n" \
             "\n" \
             "export PATH=%s\n" \
@@ -1061,19 +1080,25 @@ class RpmPM(PackageManager):
             "export INTERCEPT_DIR=%s\n" \
             "export NATIVE_ROOT=%s\n" \
             "\n" \
+            "name=`head -1 " + scriptpath + " | cut -d\' \' -f 2`\n" \
+            "kind=`head -1 " + scriptpath + " | cut -d\' \' -f 4`\n" \
+            + dump_invocation \
+            + dump_script \
             + scriptletcmd + \
-            "if [ $? -ne 0 ]; then\n" \
+            "ret=$?\n" \
+            "echo Result of ${name} ${kind}: ${ret}\n" \
+            "if [ ${ret} -ne 0 ]; then\n" \
             "  if [ $4 -eq 1 ]; then\n" \
             "    mkdir -p $1/etc/rpm-postinsts\n" \
             "    num=100\n" \
             "    while [ -e $1/etc/rpm-postinsts/${num}-* ]; do num=$((num + 1)); done\n" \
-            "    name=`head -1 " + scriptpath + " | cut -d\' \' -f 2`\n" \
             '    echo "#!$2" > $1/etc/rpm-postinsts/${num}-${name}\n' \
             '    echo "# Arg: $4" >> $1/etc/rpm-postinsts/${num}-${name}\n' \
             "    cat " + scriptpath + " >> $1/etc/rpm-postinsts/${num}-${name}\n" \
             "    chmod +x $1/etc/rpm-postinsts/${num}-${name}\n" \
+            '    echo "Info: deferring ${name} ${kind} install scriptlet to first boot"\n' \
             "  else\n" \
-            '    echo "Error: pre/post remove scriptlet failed"\n' \
+            '    echo "Error: ${name} ${kind} remove scriptlet failed"\n' \
             "  fi\n" \
             "fi\n"
 
-- 
2.1.4