gnupg: use native version for signing, rather than one provided by host

Using host gpg has been problematic, and particularly this removes
the need to serialize package creation, as long as --auto-expand-secmem
is passed to gpg-agent, and gnupg >= 2.2.4 is in use
(https://dev.gnupg.org/T3530).

Sadly, gpg-agent itself is single-threaded, so in the longer run
we might want to seek alternatives:
https://lwn.net/Articles/742542/

(a smaller issue is that rpm itself runs the gpg fronted in a serial
fashion, which slows down the build in cases of recipes with very
large amount of packages, e.g. glibc-locale)

Note that sstate signing and verification continues to use host
gpg, as depending on native gpg would create circular dependencies.

[YOCTO #12022]

(From OE-Core rev: 08fef6198122fe79d4c1213f9a64b862162ed6cd)

Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/sign_package_feed.bbclass

@@ -43,4 +43,4 @@ python () {
 }
 
 do_package_index[depends] += "signing-keys:do_deploy"
-do_rootfs[depends] += "signing-keys:do_populate_sysroot"
+do_rootfs[depends] += "signing-keys:do_populate_sysroot gnupg-native:do_populate_sysroot"

meta/classes/sign_rpm.bbclass

@@ -68,8 +68,4 @@ python sign_rpm () {
 do_package_index[depends] += "signing-keys:do_deploy"
 do_rootfs[depends] += "signing-keys:do_populate_sysroot"
 
-# Newer versions of gpg (at least 2.1.5 and 2.2.1) have issues when signing occurs in parallel
-# so unfortunately the signing must be done serially. Once the upstream problem is fixed,
-# the following line must be removed otherwise we loose all the intrinsic parallelism from
-# bitbake.  For more information, check https://bugzilla.yoctoproject.org/show_bug.cgi?id=12022.
-do_package_write_rpm[lockfiles] += "${TMPDIR}/gpg.lock"
+PACKAGE_WRITE_DEPS += "gnupg-native"

meta/lib/oe/gpg_sign.py

@@ -12,6 +12,7 @@ class LocalSigner(object):
         self.gpg_path = d.getVar('GPG_PATH')
         self.gpg_version = self.get_gpg_version()
         self.rpm_bin = bb.utils.which(os.getenv('PATH'), "rpmsign")
+        self.gpg_agent_bin = bb.utils.which(os.getenv('PATH'), "gpg-agent")
 
     def export_pubkey(self, output_file, keyid, armor=True):
         """Export GPG public key to a file"""
@@ -31,7 +32,7 @@ class LocalSigner(object):
         """Sign RPM files"""
 
         cmd = self.rpm_bin + " --addsign --define '_gpg_name %s'  " % keyid
-        gpg_args = '--no-permission-warning --batch --passphrase=%s' % passphrase
+        gpg_args = '--no-permission-warning --batch --passphrase=%s --agent-program=%s|--auto-expand-secmem' % (passphrase, self.gpg_agent_bin)
         if self.gpg_version > (2,1,):
             gpg_args += ' --pinentry-mode=loopback'
         cmd += "--define '_gpg_sign_cmd_extra_args %s' " % gpg_args
@@ -71,6 +72,9 @@ class LocalSigner(object):
         if self.gpg_version > (2,1,):
             cmd += ['--pinentry-mode', 'loopback']
 
+        if self.gpg_agent_bin:
+            cmd += ["--agent-program=%s|--auto-expand-secmem" % (self.gpg_agent_bin)]
+
         cmd += [input_file]
 
         try:
@@ -99,7 +103,7 @@ class LocalSigner(object):
         import subprocess
         try:
             ver_str = subprocess.check_output((self.gpg_bin, "--version", "--no-permission-warning")).split()[2].decode("utf-8")
-            return tuple([int(i) for i in ver_str.split('.')])
+            return tuple([int(i) for i in ver_str.split("-")[0].split('.')])
         except subprocess.CalledProcessError as e:
             raise bb.build.FuncFailed("Could not get gpg version: %s" % e)
 

meta/recipes-core/meta/signing-keys.bb

@@ -41,6 +41,7 @@ python do_get_public_keys () {
 }
 do_get_public_keys[cleandirs] = "${B}"
 addtask get_public_keys before do_install
+do_get_public_keys[depends] += "gnupg-native:do_populate_sysroot"
 
 do_install () {
     if [ -f "${B}/rpm-key" ]; then