kernel: extract functions for kernel modules to separate bbclass

* this way we can reuse the same functionality also for external modules
  including module_autoload_foo and module_conf_foo functionality
* MODULE_PACKAGES variable was removed (splited modules are now returned
  by do_split_packages
* KERNEL_MODULES_META_PACKAGE is used to append all splitted packages
  to RDEPENDS. In kernel.bbclass it's old "kernel-modules" in
  module.bbclass it defaults to ${PN} for upgrade path from
  single PN with all modules to PN depending on all new kernel-module-*

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 185 insertions, 0 deletions

diff --git a/meta/classes/kernel-module-split.bbclass b/meta/classes/kernel-module-split.bbclass
new file mode 100644
index 0000000000..aa0c499b79
--- /dev/null
+++ b/meta/classes/kernel-module-split.bbclass
@@ -0,0 +1,185 @@
+pkg_postinst_modules () {
+if [ -z "$D" ]; then
+	depmod -a ${KERNEL_VERSION}
+else
+	depmodwrapper -a -b $D ${KERNEL_VERSION}
+fi
+}
+
+pkg_postrm_modules () {
+if [ -z "$D" ]; then
+	depmod -a ${KERNEL_VERSION}
+else
+	depmodwrapper -a -b $D ${KERNEL_VERSION}
+fi
+}
+
+autoload_postinst_fragment() {
+if [ x"$D" = "x" ]; then
+	modprobe %s || true
+fi
+}
+
+do_install_append() {
+	install -d ${D}${sysconfdir}/modules-load.d/ ${D}${sysconfdir}/modprobe.d/
+}
+
+PACKAGESPLITFUNCS_prepend = "split_kernel_module_packages "
+
+KERNEL_MODULES_META_PACKAGE ?= "kernel-modules"
+
+python split_kernel_module_packages () {
+    import re
+
+    modinfoexp = re.compile("([^=]+)=(.*)")
+    kerverrexp = re.compile('^(.*-hh.*)[\.\+].*$')
+    depmodpat0 = re.compile("^(.*\.k?o):..*$")
+    depmodpat1 = re.compile("^(.*\.k?o):\s*(.*\.k?o)\s*$")
+    depmodpat2 = re.compile("^(.*\.k?o):\s*(.*\.k?o)\s*\\\$")
+    depmodpat3 = re.compile("^\t(.*\.k?o)\s*\\\$")
+    depmodpat4 = re.compile("^\t(.*\.k?o)\s*$")
+
+    def extract_modinfo(file):
+        import tempfile, subprocess
+        tempfile.tempdir = d.getVar("WORKDIR", True)
+        tf = tempfile.mkstemp()
+        tmpfile = tf[1]
+        cmd = "%sobjcopy -j .modinfo -O binary %s %s" % (d.getVar("HOST_PREFIX", True) or "", file, tmpfile)
+        subprocess.call(cmd, shell=True)
+        f = open(tmpfile)
+        l = f.read().split("\000")
+        f.close()
+        os.close(tf[0])
+        os.unlink(tmpfile)
+        vals = {}
+        for i in l:
+            m = modinfoexp.match(i)
+            if not m:
+                continue
+            vals[m.group(1)] = m.group(2)
+        return vals
+
+    def parse_depmod():
+
+        dvar = d.getVar('PKGD', True)
+
+        kernelver = d.getVar('KERNEL_VERSION', True)
+        kernelver_stripped = kernelver
+        m = kerverrexp.match(kernelver)
+        if m:
+            kernelver_stripped = m.group(1)
+        staging_kernel_dir = d.getVar("STAGING_KERNEL_DIR", True)
+        system_map_file = "%s/boot/System.map-%s" % (dvar, kernelver)
+        if not os.path.exists(system_map_file):
+            system_map_file = "%s/System.map-%s" % (staging_kernel_dir, kernelver)
+            if not os.path.exists(system_map_file):
+                bb.fatal("System.map-%s does not exist in '%s/boot' nor STAGING_KERNEL_DIR '%s'" % (kernelver, dvar, staging_kernel_dir))
+
+        cmd = "depmod -n -a -b %s -F %s %s" % (dvar, system_map_file, kernelver_stripped)
+        f = os.popen(cmd, 'r')
+
+        deps = {}
+        line = f.readline()
+        while line:
+            if not depmodpat0.match(line):
+                line = f.readline()
+                continue
+            m1 = depmodpat1.match(line)
+            if m1:
+                deps[m1.group(1)] = m1.group(2).split()
+            else:
+                m2 = depmodpat2.match(line)
+                if m2:
+                    deps[m2.group(1)] = m2.group(2).split()
+                    line = f.readline()
+                    m3 = depmodpat3.match(line)
+                    while m3:
+                        deps[m2.group(1)].extend(m3.group(1).split())
+                        line = f.readline()
+                        m3 = depmodpat3.match(line)
+                    m4 = depmodpat4.match(line)
+                    deps[m2.group(1)].extend(m4.group(1).split())
+            line = f.readline()
+        f.close()
+        return deps
+
+    def get_dependencies(file, pattern, format):
+        # file no longer includes PKGD
+        file = file.replace(d.getVar('PKGD', True) or '', '', 1)
+        # instead is prefixed with /lib/modules/${KERNEL_VERSION}
+        file = file.replace("/lib/modules/%s/" % d.getVar('KERNEL_VERSION', True) or '', '', 1)
+
+        if module_deps.has_key(file):
+            dependencies = []
+            for i in module_deps[file]:
+                m = re.match(pattern, os.path.basename(i))
+                if not m:
+                    continue
+                on = legitimize_package_name(m.group(1))
+                dependency_pkg = format % on
+                dependencies.append(dependency_pkg)
+            return dependencies
+        return []
+
+    def frob_metadata(file, pkg, pattern, format, basename):
+        vals = extract_modinfo(file)
+
+        dvar = d.getVar('PKGD', True)
+
+        # If autoloading is requested, output /etc/modules-load.d/<name>.conf and append
+        # appropriate modprobe commands to the postinst
+        autoload = d.getVar('module_autoload_%s' % basename, True)
+        if autoload:
+            name = '%s/etc/modules-load.d/%s.conf' % (dvar, basename)
+            f = open(name, 'w')
+            for m in autoload.split():
+                f.write('%s\n' % m)
+            f.close()
+            postinst = d.getVar('pkg_postinst_%s' % pkg, True)
+            if not postinst:
+                bb.fatal("pkg_postinst_%s not defined" % pkg)
+            postinst += d.getVar('autoload_postinst_fragment', True) % autoload
+            d.setVar('pkg_postinst_%s' % pkg, postinst)
+
+        # Write out any modconf fragment
+        modconf = d.getVar('module_conf_%s' % basename, True)
+        if modconf:
+            name = '%s/etc/modprobe.d/%s.conf' % (dvar, basename)
+            f = open(name, 'w')
+            f.write("%s\n" % modconf)
+            f.close()
+
+        files = d.getVar('FILES_%s' % pkg, True)
+        files = "%s /etc/modules-load.d/%s.conf /etc/modprobe.d/%s.conf" % (files, basename, basename)
+        d.setVar('FILES_%s' % pkg, files)
+
+        if vals.has_key("description"):
+            old_desc = d.getVar('DESCRIPTION_' + pkg, True) or ""
+            d.setVar('DESCRIPTION_' + pkg, old_desc + "; " + vals["description"])
+
+        rdepends = bb.utils.explode_dep_versions2(d.getVar('RDEPENDS_' + pkg, True) or "")
+        for dep in get_dependencies(file, pattern, format):
+            if not dep in rdepends:
+                rdepends[dep] = []
+        d.setVar('RDEPENDS_' + pkg, bb.utils.join_deps(rdepends, commasep=False))
+
+    module_deps = parse_depmod()
+    module_regex = '^(.*)\.k?o$'
+    module_pattern = 'kernel-module-%s'
+
+    postinst = d.getVar('pkg_postinst_modules', True)
+    postrm = d.getVar('pkg_postrm_modules', True)
+
+    modules = do_split_packages(d, root='/lib/modules', file_regex=module_regex, output_pattern=module_pattern, description='%s kernel module', postinst=postinst, postrm=postrm, recursive=True, hook=frob_metadata, extra_depends='kernel-%s' % (d.getVar("KERNEL_VERSION", True)))
+    if modules:
+        metapkg = d.getVar('KERNEL_MODULES_META_PACKAGE', True)
+        d.appendVar('RDEPENDS_' + metapkg, ' '.join(modules))
+
+    # If modules-load.d and modprobe.d are empty at this point, remove them to
+    # avoid warnings. removedirs only raises an OSError if an empty
+    # directory cannot be removed.
+    dvar = d.getVar('PKGD', True)
+    for dir in ["%s/etc/modprobe.d" % (dvar), "%s/etc/modules-load.d" % (dvar), "%s/etc" % (dvar)]:
+        if len(os.listdir(dir)) == 0:
+            os.rmdir(dir)
+}