package: Refactor to remove isElf/is_elf function duplication

There are probably further cleanups needed here but this at least removes
the major code duplication between these two similar funcitons, keeping the
kernel module ".ko" extension check for efficiency to avoid opening and
reading file contents in the general case.

(From OE-Core rev: 7ad0c0d6ab12bebeac097fc0f5210c876dcfe9be)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/package.bbclass

@@ -936,38 +936,6 @@ python split_and_strip_files () {
     sourcefile = d.expand("${WORKDIR}/debugsources.list")
     bb.utils.remove(sourcefile)
 
-    # Return type (bits):
-    # 0 - not elf
-    # 1 - ELF
-    # 2 - stripped
-    # 4 - executable
-    # 8 - shared library
-    # 16 - kernel module
-    def isELF(path):
-        type = 0
-        result = subprocess.check_output(["file", "-b", path], stderr=subprocess.STDOUT).decode("utf-8")
-
-        # Not stripped
-        if "ELF" in result:
-            type |= 1
-            if "not stripped" not in result:
-                type |= 2
-            if "executable" in result:
-                type |= 4
-            if "shared" in result:
-                type |= 8
-        return type
-
-    def isStaticLib(path):
-        if path.endswith('.a') and not os.path.islink(path):
-            with open(path, 'rb') as fh:
-                # The magic must include the first slash to avoid
-                # matching golang static libraries
-                magic = b'!<arch>\x0a/'
-                start = fh.read(len(magic))
-                return start == magic
-        return False
-
     #
     # First lets figure out all of the files we may have to process ... do this only once!
     #
@@ -987,7 +955,7 @@ python split_and_strip_files () {
                 if file.endswith(".ko") and file.find("/lib/modules/") != -1:
                     kernmods.append(file)
                     continue
-                if isStaticLib(file):
+                if oe.package.is_static_lib(file):
                     staticlibs.append(file)
                     continue
 
@@ -1017,14 +985,14 @@ python split_and_strip_files () {
                     # If it's a symlink, and points to an ELF file, we capture the readlink target
                     if cpath.islink(file):
                         target = os.readlink(file)
-                        if isELF(ltarget):
-                            #bb.note("Sym: %s (%d)" % (ltarget, isELF(ltarget)))
+                        if oe.package.is_elf(ltarget):
+                            #bb.note("Sym: %s (%d)" % (ltarget, oe.package.is_elf(ltarget)))
                             symlinks[file] = target
                         continue
 
                     # It's a file (or hardlink), not a link
                     # ...but is it ELF, and is it already stripped?
-                    elf_file = isELF(file)
+                    elf_file = oe.package.is_elf(file)
                     if elf_file & 1:
                         if elf_file & 2:
                             if 'already-stripped' in (d.getVar('INSANE_SKIP_' + pn) or "").split():

meta/lib/oe/package.py

@@ -1,8 +1,11 @@
+import mmap
+import subprocess
+
 def runstrip(arg):
     # Function to strip a single file, called from split_and_strip_files below
     # A working 'file' (one which works on the target architecture)
     #
-    # The elftype is a bit pattern (explained in split_and_strip_files) to tell
+    # The elftype is a bit pattern (explained in is_elf below) to tell
     # us what type of file we're processing...
     # 4 - executable
     # 8 - shared library
@@ -44,6 +47,44 @@ def runstrip(arg):
 
     return
 
+# Detect .ko module by searching for "vermagic=" string
+def is_kernel_module(path):
+    with open(path) as f:
+        return mmap.mmap(f.fileno(), 0, prot=mmap.PROT_READ).find(b"vermagic=") >= 0
+
+# Return type (bits):
+# 0 - not elf
+# 1 - ELF
+# 2 - stripped
+# 4 - executable
+# 8 - shared library
+# 16 - kernel module
+def is_elf(path):
+    exec_type = 0
+    result = subprocess.check_output(["file", "-b", path], stderr=subprocess.STDOUT).decode("utf-8")
+
+    if "ELF" in result:
+        exec_type |= 1
+        if "not stripped" not in result:
+            exec_type |= 2
+        if "executable" in result:
+            exec_type |= 4
+        if "shared" in result:
+            exec_type |= 8
+        if "relocatable" in result:
+            if path.endswith(".ko") and path.find("/lib/modules/") != -1 and is_kernel_module(path):
+                exec_type |= 16
+    return exec_type
+
+def is_static_lib(path):
+    if path.endswith('.a') and not os.path.islink(path):
+        with open(path, 'rb') as fh:
+            # The magic must include the first slash to avoid
+            # matching golang static libraries
+            magic = b'!<arch>\x0a/'
+            start = fh.read(len(magic))
+            return start == magic
+    return False
 
 def strip_execs(pn, dstdir, strip_cmd, libdir, base_libdir, qa_already_stripped=False):
     """
@@ -56,35 +97,7 @@ def strip_execs(pn, dstdir, strip_cmd, libdir, base_libdir, qa_already_stripped=
     :param qa_already_stripped: Set to True if already-stripped' in ${INSANE_SKIP}
     This is for proper logging and messages only.
     """
-    import stat, errno, oe.path, oe.utils, mmap, subprocess
-
-    # Detect .ko module by searching for "vermagic=" string
-    def is_kernel_module(path):
-        with open(path) as f:
-            return mmap.mmap(f.fileno(), 0, prot=mmap.PROT_READ).find(b"vermagic=") >= 0
-
-    # Return type (bits):
-    # 0 - not elf
-    # 1 - ELF
-    # 2 - stripped
-    # 4 - executable
-    # 8 - shared library
-    # 16 - kernel module
-    def is_elf(path):
-        exec_type = 0
-        result = subprocess.check_output(["file", "-b", path], stderr=subprocess.STDOUT).decode("utf-8")
-
-        if "ELF" in result:
-            exec_type |= 1
-            if "not stripped" not in result:
-                exec_type |= 2
-            if "executable" in result:
-                exec_type |= 4
-            if "shared" in result:
-                exec_type |= 8
-            if "relocatable" in result and is_kernel_module(path):
-                exec_type |= 16
-        return exec_type
+    import stat, errno, oe.path, oe.utils
 
     elffiles = {}
     inodes = {}