classes/buildhistory: optimise getting package size list

Invoking oe-pkgdata-util in turn for every package in the list was slow
with a large image. Modify oe-pkgdata-util's read-value command to take
an option to read the list of packages from a file, as well as prefix
the value with the package name; we can then use this to get all of the
package sizes at once. This reduces the time to gather this information
from minutes to just a second or two.

Fixes [YOCTO #7339].

(From OE-Core rev: 51c24904cc1bc823bccc3f179b8d7a192dace168)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/buildhistory.bbclass

@@ -3,7 +3,7 @@
 #
 # Based in part on testlab.bbclass and packagehistory.bbclass
 #
-# Copyright (C) 2011-2014 Intel Corporation
+# Copyright (C) 2011-2016 Intel Corporation
 # Copyright (C) 2007-2011 Koen Kooi <koen@openembedded.org>
 #
 
@@ -416,15 +416,8 @@ buildhistory_get_installed() {
 	rm $1/depends.tmp
 
 	# Produce installed package sizes list
-	printf "" > $1/installed-package-sizes.tmp
-	cat $pkgcache | while read pkg pkgfile pkgarch
-	do
-		size=`oe-pkgdata-util -p ${PKGDATA_DIR} read-value "PKGSIZE" ${pkg}_${pkgarch}`
-		if [ "$size" != "" ] ; then
-			echo "$size $pkg" >> $1/installed-package-sizes.tmp
-		fi
-	done
-	cat $1/installed-package-sizes.tmp | sort -n -r | awk '{print $1 "\tKiB " $2}' > $1/installed-package-sizes.txt
+	oe-pkgdata-util -p ${PKGDATA_DIR} read-value "PKGSIZE" -n -f $pkgcache > $1/installed-package-sizes.tmp
+	cat $1/installed-package-sizes.tmp | awk '{print $2 "\tKiB " $1}' | sort -n -r > $1/installed-package-sizes.txt
 	rm $1/installed-package-sizes.tmp
 
 	# We're now done with the cache, delete it

scripts/oe-pkgdata-util

@@ -161,8 +161,18 @@ def glob(args):
 def read_value(args):
     # Handle both multiple arguments and multiple values within an arg (old syntax)
     packages = []
-    for pkgitem in args.pkg:
-        packages.extend(pkgitem.split())
+    if args.file:
+        with open(args.file, 'r') as f:
+            for line in f:
+                splitline = line.split()
+                if splitline:
+                    packages.append(splitline[0])
+    else:
+        for pkgitem in args.pkg:
+            packages.extend(pkgitem.split())
+        if not packages:
+            logger.error("No packages specified")
+            sys.exit(1)
 
     def readvar(pkgdata_file, valuename):
         val = ""
@@ -187,9 +197,13 @@ def read_value(args):
                 qvar = "%s_%s" % (args.valuename, mappedpkg)
                 # PKGSIZE is now in bytes, but we we want it in KB
                 pkgsize = (int(readvar(revlink, qvar)) + 1024 // 2) // 1024
-                print("%d" % pkgsize)
+                value = "%d" % pkgsize
+            else:
+                value = readvar(revlink, qvar)
+            if args.prefix_name:
+                print('%s %s' % (pkg_name, value))
             else:
-                print(readvar(revlink, qvar))
+                print(value)
 
 def lookup_pkglist(pkgs, pkgdata_dir, reverse):
     if reverse:
@@ -465,7 +479,9 @@ def main():
                                           help='Read any pkgdata value for one or more packages',
                                           description='Reads the named value from the pkgdata files for the specified packages')
     parser_read_value.add_argument('valuename', help='Name of the value to look up')
-    parser_read_value.add_argument('pkg', nargs='+', help='Runtime package name to look up')
+    parser_read_value.add_argument('pkg', nargs='*', help='Runtime package name to look up')
+    parser_read_value.add_argument('-f', '--file', help='Read package names from the specified file (one per line, first field only)')
+    parser_read_value.add_argument('-n', '--prefix-name', help='Prefix output with package name', action='store_true')
     parser_read_value.set_defaults(func=read_value)
 
     parser_glob = subparsers.add_parser('glob',