poky/meta/classes-global/sstate.bbclass

#
# Copyright OpenEmbedded Contributors
#
# SPDX-License-Identifier: MIT
#

SSTATE_VERSION = "14"

SSTATE_ZSTD_CLEVEL ??= "8"

SSTATE_MANIFESTS ?= "${TMPDIR}/sstate-control"
SSTATE_MANFILEPREFIX = "${SSTATE_MANIFESTS}/manifest-${SSTATE_MANMACH}-${PN}"

def generate_sstatefn(spec, hash, taskname, siginfo, d):
    if taskname is None:
       return ""
    extension = ".tar.zst"
    # 8 chars reserved for siginfo
    limit = 254 - 8
    if siginfo:
        limit = 254
        extension = ".tar.zst.siginfo"
    if not hash:
        hash = "INVALID"
    fn = spec + hash + "_" + taskname + extension
    # If the filename is too long, attempt to reduce it
    if len(fn) > limit:
        components = spec.split(":")
        # Fields 0,5,6 are mandatory, 1 is most useful, 2,3,4 are just for information
        # 7 is for the separators
        avail = (limit - len(hash + "_" + taskname + extension) - len(components[0]) - len(components[1]) - len(components[5]) - len(components[6]) - 7) // 3
        components[2] = components[2][:avail]
        components[3] = components[3][:avail]
        components[4] = components[4][:avail]
        spec = ":".join(components)
        fn = spec + hash + "_" + taskname + extension
        if len(fn) > limit:
            bb.fatal("Unable to reduce sstate name to less than 255 chararacters")
    return hash[:2] + "/" + hash[2:4] + "/" + fn

SSTATE_PKGARCH    = "${PACKAGE_ARCH}"
SSTATE_PKGSPEC    = "sstate:${PN}:${PACKAGE_ARCH}${TARGET_VENDOR}-${TARGET_OS}:${PV}:${PR}:${SSTATE_PKGARCH}:${SSTATE_VERSION}:"
SSTATE_SWSPEC     = "sstate:${PN}::${PV}:${PR}::${SSTATE_VERSION}:"
SSTATE_PKGNAME    = "${SSTATE_EXTRAPATH}${@generate_sstatefn(d.getVar('SSTATE_PKGSPEC'), d.getVar('BB_UNIHASH'), d.getVar('SSTATE_CURRTASK'), False, d)}"
SSTATE_PKG        = "${SSTATE_DIR}/${SSTATE_PKGNAME}"
SSTATE_EXTRAPATH   = ""
SSTATE_EXTRAPATHWILDCARD = ""
SSTATE_PATHSPEC   = "${SSTATE_DIR}/${SSTATE_EXTRAPATHWILDCARD}*/*/${SSTATE_PKGSPEC}*_${SSTATE_PATH_CURRTASK}.tar.zst*"

# explicitly make PV to depend on evaluated value of PV variable
PV[vardepvalue] = "${PV}"

# We don't want the sstate to depend on things like the distro string
# of the system, we let the sstate paths take care of this.
SSTATE_EXTRAPATH[vardepvalue] = ""
SSTATE_EXTRAPATHWILDCARD[vardepvalue] = ""

# Avoid docbook/sgml catalog warnings for now
SSTATE_ALLOW_OVERLAP_FILES += "${STAGING_ETCDIR_NATIVE}/sgml ${STAGING_DATADIR_NATIVE}/sgml"
# sdk-provides-dummy-nativesdk and nativesdk-buildtools-perl-dummy overlap for different SDKMACHINE
SSTATE_ALLOW_OVERLAP_FILES += "${DEPLOY_DIR_RPM}/sdk_provides_dummy_nativesdk/ ${DEPLOY_DIR_IPK}/sdk-provides-dummy-nativesdk/"
SSTATE_ALLOW_OVERLAP_FILES += "${DEPLOY_DIR_RPM}/buildtools_dummy_nativesdk/ ${DEPLOY_DIR_IPK}/buildtools-dummy-nativesdk/"
# target-sdk-provides-dummy overlaps that allarch is disabled when multilib is used
SSTATE_ALLOW_OVERLAP_FILES += "${COMPONENTS_DIR}/sdk-provides-dummy-target/ ${DEPLOY_DIR_RPM}/sdk_provides_dummy_target/ ${DEPLOY_DIR_IPK}/sdk-provides-dummy-target/"
# Archive the sources for many architectures in one deploy folder
SSTATE_ALLOW_OVERLAP_FILES += "${DEPLOY_DIR_SRC}"
# ovmf/grub-efi/systemd-boot/intel-microcode multilib recipes can generate identical overlapping files
SSTATE_ALLOW_OVERLAP_FILES += "${DEPLOY_DIR_IMAGE}/ovmf"
SSTATE_ALLOW_OVERLAP_FILES += "${DEPLOY_DIR_IMAGE}/grub-efi"
SSTATE_ALLOW_OVERLAP_FILES += "${DEPLOY_DIR_IMAGE}/systemd-boot"
SSTATE_ALLOW_OVERLAP_FILES += "${DEPLOY_DIR_IMAGE}/microcode"

SSTATE_SCAN_FILES ?= "*.la *-config *_config postinst-*"
SSTATE_SCAN_CMD ??= 'find ${SSTATE_BUILDDIR} \( -name "${@"\" -o -name \"".join(d.getVar("SSTATE_SCAN_FILES").split())}" \) -type f'
SSTATE_SCAN_CMD_NATIVE ??= 'grep -Irl -e ${RECIPE_SYSROOT} -e ${RECIPE_SYSROOT_NATIVE} -e ${HOSTTOOLS_DIR} ${SSTATE_BUILDDIR}'
SSTATE_HASHEQUIV_FILEMAP ?= " \
    populate_sysroot:*/postinst-useradd-*:${TMPDIR} \
    populate_sysroot:*/postinst-useradd-*:${COREBASE} \
    populate_sysroot:*/postinst-useradd-*:regex-\s(PATH|PSEUDO_INCLUDE_PATHS|HOME|LOGNAME|OMP_NUM_THREADS|USER)=.*\s \
    populate_sysroot:*/crossscripts/*:${TMPDIR} \
    populate_sysroot:*/crossscripts/*:${COREBASE} \
    "

BB_HASHFILENAME = "False ${SSTATE_PKGSPEC} ${SSTATE_SWSPEC}"

SSTATE_ARCHS_TUNEPKG ??= "${TUNE_PKGARCH}"
SSTATE_ARCHS = " \
    ${BUILD_ARCH} \
    ${BUILD_ARCH}_${ORIGNATIVELSBSTRING} \
    ${BUILD_ARCH}_${SDK_ARCH}_${SDK_OS} \
    ${SDK_ARCH}_${SDK_OS} \
    ${SDK_ARCH}_${SDK_ARCH}-${SDKPKGSUFFIX} \
    allarch \
    ${SSTATE_ARCHS_TUNEPKG} \
    ${PACKAGE_EXTRA_ARCHS} \
    ${MACHINE_ARCH}"
SSTATE_ARCHS[vardepsexclude] = "ORIGNATIVELSBSTRING"

SSTATE_MANMACH ?= "${SSTATE_PKGARCH}"

SSTATECREATEFUNCS += "sstate_hardcode_path"
SSTATECREATEFUNCS[vardeps] = "SSTATE_SCAN_FILES"
SSTATEPOSTCREATEFUNCS = ""
SSTATEPREINSTFUNCS = ""
SSTATEPOSTUNPACKFUNCS = "sstate_hardcode_path_unpack"
EXTRA_STAGING_FIXMES ?= "HOSTTOOLS_DIR"

# Check whether sstate exists for tasks that support sstate and are in the
# locked signatures file.
SIGGEN_LOCKEDSIGS_SSTATE_EXISTS_CHECK ?= 'error'

# Check whether the task's computed hash matches the task's hash in the
# locked signatures file.
SIGGEN_LOCKEDSIGS_TASKSIG_CHECK ?= "error"

# The GnuPG key ID and passphrase to use to sign sstate archives (or unset to
# not sign)
SSTATE_SIG_KEY ?= ""
SSTATE_SIG_PASSPHRASE ?= ""
# Whether to verify the GnUPG signatures when extracting sstate archives
SSTATE_VERIFY_SIG ?= "0"
# List of signatures to consider valid.
SSTATE_VALID_SIGS ??= ""
SSTATE_VALID_SIGS[vardepvalue] = ""

SSTATE_HASHEQUIV_METHOD ?= "oe.sstatesig.OEOuthashBasic"
SSTATE_HASHEQUIV_METHOD[doc] = "The fully-qualified function used to calculate \
    the output hash for a task, which in turn is used to determine equivalency. \
    "

SSTATE_HASHEQUIV_REPORT_TASKDATA ?= "0"
SSTATE_HASHEQUIV_REPORT_TASKDATA[doc] = "Report additional useful data to the \
    hash equivalency server, such as PN, PV, taskname, etc. This information \
    is very useful for developers looking at task data, but may leak sensitive \
    data if the equivalence server is public. \
    "

python () {
    if bb.data.inherits_class('native', d):
        d.setVar('SSTATE_PKGARCH', d.getVar('BUILD_ARCH', False))
    elif bb.data.inherits_class('crosssdk', d):
        d.setVar('SSTATE_PKGARCH', d.expand("${BUILD_ARCH}_${SDK_ARCH}_${SDK_OS}"))
    elif bb.data.inherits_class('cross', d):
        d.setVar('SSTATE_PKGARCH', d.expand("${BUILD_ARCH}"))
    elif bb.data.inherits_class('nativesdk', d):
        d.setVar('SSTATE_PKGARCH', d.expand("${SDK_ARCH}_${SDK_OS}"))
    elif bb.data.inherits_class('cross-canadian', d):
        d.setVar('SSTATE_PKGARCH', d.expand("${SDK_ARCH}_${PACKAGE_ARCH}"))
    elif bb.data.inherits_class('allarch', d) and d.getVar("PACKAGE_ARCH") == "all":
        d.setVar('SSTATE_PKGARCH', "allarch")
    else:
        d.setVar('SSTATE_MANMACH', d.expand("${PACKAGE_ARCH}"))

    if bb.data.inherits_class('native', d) or bb.data.inherits_class('crosssdk', d) or bb.data.inherits_class('cross', d):
        d.setVar('SSTATE_EXTRAPATH', "${NATIVELSBSTRING}/")
        d.setVar('BB_HASHFILENAME', "True ${SSTATE_PKGSPEC} ${SSTATE_SWSPEC}")
        d.setVar('SSTATE_EXTRAPATHWILDCARD', "${NATIVELSBSTRING}/")

    unique_tasks = sorted(set((d.getVar('SSTATETASKS') or "").split()))
    d.setVar('SSTATETASKS', " ".join(unique_tasks))
    for task in unique_tasks:
        d.prependVarFlag(task, 'prefuncs', "sstate_task_prefunc ")
        # Generally sstate should be last, execpt for buildhistory functions
        postfuncs = (d.getVarFlag(task, 'postfuncs') or "").split()
        newpostfuncs = [p for p in postfuncs if "buildhistory" not in p] + ["sstate_task_postfunc"] + [p for p in postfuncs if "buildhistory" in p]
        d.setVarFlag(task, 'postfuncs', " ".join(newpostfuncs))
        d.setVarFlag(task, 'network', '1')
        d.setVarFlag(task + "_setscene", 'network', '1')
}

def sstate_init(task, d):
    ss = {}
    ss['task'] = task
    ss['dirs'] = []
    ss['plaindirs'] = []
    ss['lockfiles'] = []
    ss['lockfiles-shared'] = []
    return ss

def sstate_state_fromvars(d, task = None):
    if task is None:
        task = d.getVar('BB_CURRENTTASK')
        if not task:
            bb.fatal("sstate code running without task context?!")
        task = task.replace("_setscene", "")

    if task.startswith("do_"):
        task = task[3:]
    inputs = (d.getVarFlag("do_" + task, 'sstate-inputdirs') or "").split()
    outputs = (d.getVarFlag("do_" + task, 'sstate-outputdirs') or "").split()
    plaindirs = (d.getVarFlag("do_" + task, 'sstate-plaindirs') or "").split()
    lockfiles = (d.getVarFlag("do_" + task, 'sstate-lockfile') or "").split()
    lockfilesshared = (d.getVarFlag("do_" + task, 'sstate-lockfile-shared') or "").split()
    fixmedir = d.getVarFlag("do_" + task, 'sstate-fixmedir') or ""
    if not task or len(inputs) != len(outputs):
        bb.fatal("sstate variables not setup correctly?!")

    if task == "populate_lic":
        d.setVar("SSTATE_PKGSPEC", "${SSTATE_SWSPEC}")
        d.setVar("SSTATE_EXTRAPATH", "")
        d.setVar('SSTATE_EXTRAPATHWILDCARD', "")

    ss = sstate_init(task, d)
    for i in range(len(inputs)):
        sstate_add(ss, inputs[i], outputs[i], d)
    ss['lockfiles'] = lockfiles
    ss['lockfiles-shared'] = lockfilesshared
    ss['plaindirs'] = plaindirs
    ss['fixmedir'] = fixmedir
    return ss

def sstate_add(ss, source, dest, d):
    if not source.endswith("/"):
         source = source + "/"
    if not dest.endswith("/"):
         dest = dest + "/"
    source = os.path.normpath(source)
    dest = os.path.normpath(dest)
    srcbase = os.path.basename(source)
    ss['dirs'].append([srcbase, source, dest])
    return ss

def sstate_install(ss, d):
    import oe.path
    import oe.sstatesig
    import subprocess

    def prepdir(dir):
        # remove dir if it exists, ensure any parent directories do exist
        if os.path.exists(dir):
            oe.path.remove(dir)
        bb.utils.mkdirhier(dir)
        oe.path.remove(dir)

    sstateinst = d.getVar("SSTATE_INSTDIR")

    for state in ss['dirs']:
        prepdir(state[1])
        bb.utils.rename(sstateinst + state[0], state[1])

    sharedfiles = []
    shareddirs = []
    bb.utils.mkdirhier(d.expand("${SSTATE_MANIFESTS}"))

    manifest, d2 = oe.sstatesig.sstate_get_manifest_filename(ss['task'], d)

    if os.access(manifest, os.R_OK):
        bb.fatal("Package already staged (%s)?!" % manifest)

    d.setVar("SSTATE_INST_POSTRM", manifest + ".postrm")

    locks = []
    for lock in ss['lockfiles-shared']:
        locks.append(bb.utils.lockfile(lock, True))
    for lock in ss['lockfiles']:
        locks.append(bb.utils.lockfile(lock))

    for state in ss['dirs']:
        bb.debug(2, "Staging files from %s to %s" % (state[1], state[2]))
        for walkroot, dirs, files in os.walk(state[1]):
            for file in files:
                srcpath = os.path.join(walkroot, file)
                dstpath = srcpath.replace(state[1], state[2])
                #bb.debug(2, "Staging %s to %s" % (srcpath, dstpath))
                sharedfiles.append(dstpath)
            for dir in dirs:
                srcdir = os.path.join(walkroot, dir)
                dstdir = srcdir.replace(state[1], state[2])
                #bb.debug(2, "Staging %s to %s" % (srcdir, dstdir))
                if os.path.islink(srcdir):
                    sharedfiles.append(dstdir)
                    continue
                if not dstdir.endswith("/"):
                    dstdir = dstdir + "/"
                shareddirs.append(dstdir)

    # Check the file list for conflicts against files which already exist
    overlap_allowed = (d.getVar("SSTATE_ALLOW_OVERLAP_FILES") or "").split()
    match = []
    for f in sharedfiles:
        if os.path.exists(f):
            f = os.path.normpath(f)
            realmatch = True
            for w in overlap_allowed:
                w = os.path.normpath(w)
                if f.startswith(w):
                    realmatch = False
                    break
            if realmatch:
                match.append(f)
                sstate_search_cmd = "grep -rlF '%s' %s --exclude=index-* | sed -e 's:^.*/::'" % (f, d.expand("${SSTATE_MANIFESTS}"))
                search_output = subprocess.Popen(sstate_search_cmd, shell=True, stdout=subprocess.PIPE).communicate()[0]
                if search_output:
                    match.append("  (matched in %s)" % search_output.decode('utf-8').rstrip())
                else:
                    match.append("  (not matched to any task)")
    if match:
        bb.fatal("Recipe %s is trying to install files into a shared " \
          "area when those files already exist. The files and the manifests listing " \
          "them are:\n  %s\n"
          "Please adjust the recipes so only one recipe provides a given file. " % \
          (d.getVar('PN'), "\n  ".join(match)))

    if ss['fixmedir'] and os.path.exists(ss['fixmedir'] + "/fixmepath.cmd"):
        sharedfiles.append(ss['fixmedir'] + "/fixmepath.cmd")
        sharedfiles.append(ss['fixmedir'] + "/fixmepath")

    # Write out the manifest
    with open(manifest, "w") as f:
        for file in sharedfiles:
            f.write(file + "\n")

        # We want to ensure that directories appear at the end of the manifest
        # so that when we test to see if they should be deleted any contents
        # added by the task will have been removed first.
        dirs = sorted(shareddirs, key=len)
        # Must remove children first, which will have a longer path than the parent
        for di in reversed(dirs):
            f.write(di + "\n")

    # Append to the list of manifests for this PACKAGE_ARCH

    i = d2.expand("${SSTATE_MANIFESTS}/index-${SSTATE_MANMACH}")
    l = bb.utils.lockfile(i + ".lock")
    filedata = d.getVar("STAMP") + " " + d2.getVar("SSTATE_MANFILEPREFIX") + " " + d.getVar("WORKDIR") + "\n"
    manifests = []
    if os.path.exists(i):
        with open(i, "r") as f:
            manifests = f.readlines()
    # We append new entries, we don't remove older entries which may have the same
    # manifest name but different versions from stamp/workdir. See below.
    if filedata not in manifests:
        with open(i, "a+") as f:
            f.write(filedata)
    bb.utils.unlockfile(l)

    # Run the actual file install
    for state in ss['dirs']:
        if os.path.exists(state[1]):
            oe.path.copyhardlinktree(state[1], state[2])

    for plain in ss['plaindirs']:
        workdir = d.getVar('WORKDIR')
        sharedworkdir = os.path.join(d.getVar('TMPDIR'), "work-shared")
        src = sstateinst + "/" + plain.replace(workdir, '')
        if sharedworkdir in plain:
            src = sstateinst + "/" + plain.replace(sharedworkdir, '')
        dest = plain
        bb.utils.mkdirhier(src)
        prepdir(dest)
        bb.utils.rename(src, dest)

    for lock in locks:
        bb.utils.unlockfile(lock)

sstate_install[vardepsexclude] += "SSTATE_ALLOW_OVERLAP_FILES SSTATE_MANMACH SSTATE_MANFILEPREFIX STAMP"

def sstate_installpkg(ss, d):
    from oe.gpg_sign import get_signer

    sstateinst = d.expand("${WORKDIR}/sstate-install-%s/" % ss['task'])
    d.setVar("SSTATE_CURRTASK", ss['task'])
    sstatefetch = d.getVar('SSTATE_PKGNAME')
    sstatepkg = d.getVar('SSTATE_PKG')
    verify_sig = bb.utils.to_boolean(d.getVar("SSTATE_VERIFY_SIG"), False)

    if not os.path.exists(sstatepkg) or (verify_sig and not os.path.exists(sstatepkg + '.sig')):
        pstaging_fetch(sstatefetch, d)

    if not os.path.isfile(sstatepkg):
        bb.note("Sstate package %s does not exist" % sstatepkg)
        return False

    sstate_clean(ss, d)

    d.setVar('SSTATE_INSTDIR', sstateinst)

    if verify_sig:
        if not os.path.isfile(sstatepkg + '.sig'):
            bb.warn("No signature file for sstate package %s, skipping acceleration..." % sstatepkg)
            return False
        signer = get_signer(d, 'local')
        if not signer.verify(sstatepkg + '.sig', d.getVar("SSTATE_VALID_SIGS")):
            bb.warn("Cannot verify signature on sstate package %s, skipping acceleration..." % sstatepkg)
            return False

    # Empty sstateinst directory, ensure its clean
    if os.path.exists(sstateinst):
        oe.path.remove(sstateinst)
    bb.utils.mkdirhier(sstateinst)

    sstateinst = d.getVar("SSTATE_INSTDIR")
    d.setVar('SSTATE_FIXMEDIR', ss['fixmedir'])

    for f in (d.getVar('SSTATEPREINSTFUNCS') or '').split() + ['sstate_unpack_package']:
        # All hooks should run in the SSTATE_INSTDIR
        bb.build.exec_func(f, d, (sstateinst,))

    return sstate_installpkgdir(ss, d)

def sstate_installpkgdir(ss, d):
    import oe.path
    import subprocess

    sstateinst = d.getVar("SSTATE_INSTDIR")
    d.setVar('SSTATE_FIXMEDIR', ss['fixmedir'])

    for f in (d.getVar('SSTATEPOSTUNPACKFUNCS') or '').split():
        # All hooks should run in the SSTATE_INSTDIR
        bb.build.exec_func(f, d, (sstateinst,))

    sstate_install(ss, d)

    return True

python sstate_hardcode_path_unpack () {
    # Fixup hardcoded paths
    #
    # Note: The logic below must match the reverse logic in
    # sstate_hardcode_path(d)
    import subprocess

    sstateinst = d.getVar('SSTATE_INSTDIR')
    sstatefixmedir = d.getVar('SSTATE_FIXMEDIR')
    fixmefn = sstateinst + "fixmepath"
    if os.path.isfile(fixmefn):
        staging_target = d.getVar('RECIPE_SYSROOT')
        staging_host = d.getVar('RECIPE_SYSROOT_NATIVE')

        if bb.data.inherits_class('native', d) or bb.data.inherits_class('cross-canadian', d):
            sstate_sed_cmd = "sed -i -e 's:FIXMESTAGINGDIRHOST:%s:g'" % (staging_host)
        elif bb.data.inherits_class('cross', d) or bb.data.inherits_class('crosssdk', d):
            sstate_sed_cmd = "sed -i -e 's:FIXMESTAGINGDIRTARGET:%s:g; s:FIXMESTAGINGDIRHOST:%s:g'" % (staging_target, staging_host)
        else:
            sstate_sed_cmd = "sed -i -e 's:FIXMESTAGINGDIRTARGET:%s:g'" % (staging_target)

        extra_staging_fixmes = d.getVar('EXTRA_STAGING_FIXMES') or ''
        for fixmevar in extra_staging_fixmes.split():
            fixme_path = d.getVar(fixmevar)
            sstate_sed_cmd += " -e 's:FIXME_%s:%s:g'" % (fixmevar, fixme_path)

        # Add sstateinst to each filename in fixmepath, use xargs to efficiently call sed
        sstate_hardcode_cmd = "sed -e 's:^:%s:g' %s | xargs %s" % (sstateinst, fixmefn, sstate_sed_cmd)

        # Defer do_populate_sysroot relocation command
        if sstatefixmedir:
            bb.utils.mkdirhier(sstatefixmedir)
            with open(sstatefixmedir + "/fixmepath.cmd", "w") as f:
                sstate_hardcode_cmd = sstate_hardcode_cmd.replace(fixmefn, sstatefixmedir + "/fixmepath")
                sstate_hardcode_cmd = sstate_hardcode_cmd.replace(sstateinst, "FIXMEFINALSSTATEINST")
                sstate_hardcode_cmd = sstate_hardcode_cmd.replace(staging_host, "FIXMEFINALSSTATEHOST")
                sstate_hardcode_cmd = sstate_hardcode_cmd.replace(staging_target, "FIXMEFINALSSTATETARGET")
                f.write(sstate_hardcode_cmd)
            bb.utils.copyfile(fixmefn, sstatefixmedir + "/fixmepath")
            return

        bb.note("Replacing fixme paths in sstate package: %s" % (sstate_hardcode_cmd))
        subprocess.check_call(sstate_hardcode_cmd, shell=True)

        # Need to remove this or we'd copy it into the target directory and may
        # conflict with another writer
        os.remove(fixmefn)
}

def sstate_clean_cachefile(ss, d):
    import oe.path

    if d.getVarFlag('do_%s' % ss['task'], 'task'):
        d.setVar("SSTATE_PATH_CURRTASK", ss['task'])
        sstatepkgfile = d.getVar('SSTATE_PATHSPEC')
        bb.note("Removing %s" % sstatepkgfile)
        oe.path.remove(sstatepkgfile)

def sstate_clean_cachefiles(d):
    for task in (d.getVar('SSTATETASKS') or "").split():
        ld = d.createCopy()
        ss = sstate_state_fromvars(ld, task)
        sstate_clean_cachefile(ss, ld)

def sstate_clean_manifest(manifest, d, canrace=False, prefix=None):
    import oe.path

    with open(manifest) as mfile:
        entries = mfile.readlines()

    for entry in entries:
        entry = entry.strip()
        if prefix and not entry.startswith("/"):
            entry = prefix + "/" + entry
        bb.debug(2, "Removing manifest: %s" % entry)
        # We can race against another package populating directories as we're removing them
        # so we ignore errors here.
        try:
            if entry.endswith("/"):
                if os.path.islink(entry[:-1]):
                    os.remove(entry[:-1])
                elif os.path.exists(entry) and len(os.listdir(entry)) == 0 and not canrace:
                    # Removing directories whilst builds are in progress exposes a race. Only
                    # do it in contexts where it is safe to do so.
                    os.rmdir(entry[:-1])
            else:
                os.remove(entry)
        except OSError:
            pass

    postrm = manifest + ".postrm"
    if os.path.exists(manifest + ".postrm"):
        import subprocess
        os.chmod(postrm, 0o755)
        subprocess.check_call(postrm, shell=True)
        oe.path.remove(postrm)

    oe.path.remove(manifest)

def sstate_clean(ss, d):
    import oe.path
    import glob

    d2 = d.createCopy()
    stamp_clean = d.getVar("STAMPCLEAN")
    extrainf = d.getVarFlag("do_" + ss['task'], 'stamp-extra-info')
    if extrainf:
        d2.setVar("SSTATE_MANMACH", extrainf)
        wildcard_stfile = "%s.do_%s*.%s" % (stamp_clean, ss['task'], extrainf)
    else:
        wildcard_stfile = "%s.do_%s*" % (stamp_clean, ss['task'])

    manifest = d2.expand("${SSTATE_MANFILEPREFIX}.%s" % ss['task'])

    if os.path.exists(manifest):
        locks = []
        for lock in ss['lockfiles-shared']:
            locks.append(bb.utils.lockfile(lock))
        for lock in ss['lockfiles']:
            locks.append(bb.utils.lockfile(lock))

        sstate_clean_manifest(manifest, d, canrace=True)

        for lock in locks:
            bb.utils.unlockfile(lock)

    # Remove the current and previous stamps, but keep the sigdata.
    #
    # The glob() matches do_task* which may match multiple tasks, for
    # example: do_package and do_package_write_ipk, so we need to
    # exactly match *.do_task.* and *.do_task_setscene.*
    rm_stamp = '.do_%s.' % ss['task']
    rm_setscene = '.do_%s_setscene.' % ss['task']
    # For BB_SIGNATURE_HANDLER = "noop"
    rm_nohash = ".do_%s" % ss['task']
    for stfile in glob.glob(wildcard_stfile):
        # Keep the sigdata
        if ".sigdata." in stfile or ".sigbasedata." in stfile:
            continue
        # Preserve taint files in the stamps directory
        if stfile.endswith('.taint'):
            continue
        if rm_stamp in stfile or rm_setscene in stfile or \
                stfile.endswith(rm_nohash):
            oe.path.remove(stfile)

sstate_clean[vardepsexclude] = "SSTATE_MANFILEPREFIX"

CLEANFUNCS += "sstate_cleanall"

python sstate_cleanall() {
    bb.note("Removing shared state for package %s" % d.getVar('PN'))

    manifest_dir = d.getVar('SSTATE_MANIFESTS')
    if not os.path.exists(manifest_dir):
        return

    tasks = d.getVar('SSTATETASKS').split()
    for name in tasks:
        ld = d.createCopy()
        shared_state = sstate_state_fromvars(ld, name)
        sstate_clean(shared_state, ld)
}

python sstate_hardcode_path () {
    import subprocess, platform

    # Need to remove hardcoded paths and fix these when we install the
    # staging packages.
    #
    # Note: the logic in this function needs to match the reverse logic
    # in sstate_installpkg(ss, d)

    staging_target = d.getVar('RECIPE_SYSROOT')
    staging_host = d.getVar('RECIPE_SYSROOT_NATIVE')
    sstate_builddir = d.getVar('SSTATE_BUILDDIR')

    sstate_sed_cmd = "sed -i -e 's:%s:FIXMESTAGINGDIRHOST:g'" % staging_host
    if bb.data.inherits_class('native', d) or bb.data.inherits_class('cross-canadian', d):
        sstate_grep_cmd = "grep -l -e '%s'" % (staging_host)
    elif bb.data.inherits_class('cross', d) or bb.data.inherits_class('crosssdk', d):
        sstate_grep_cmd = "grep -l -e '%s' -e '%s'" % (staging_target, staging_host)
        sstate_sed_cmd += " -e 's:%s:FIXMESTAGINGDIRTARGET:g'" % staging_target
    else:
        sstate_grep_cmd = "grep -l -e '%s' -e '%s'" % (staging_target, staging_host)
        sstate_sed_cmd += " -e 's:%s:FIXMESTAGINGDIRTARGET:g'" % staging_target

    extra_staging_fixmes = d.getVar('EXTRA_STAGING_FIXMES') or ''
    for fixmevar in extra_staging_fixmes.split():
        fixme_path = d.getVar(fixmevar)
        sstate_sed_cmd += " -e 's:%s:FIXME_%s:g'" % (fixme_path, fixmevar)
        sstate_grep_cmd += " -e '%s'" % (fixme_path)

    fixmefn =  sstate_builddir + "fixmepath"

    sstate_scan_cmd = d.getVar('SSTATE_SCAN_CMD')
    sstate_filelist_cmd = "tee %s" % (fixmefn)

    # fixmepath file needs relative paths, drop sstate_builddir prefix
    sstate_filelist_relative_cmd = "sed -i -e 's:^%s::g' %s" % (sstate_builddir, fixmefn)

    xargs_no_empty_run_cmd = '--no-run-if-empty'
    if platform.system() == 'Darwin':
        xargs_no_empty_run_cmd = ''

    # Limit the fixpaths and sed operations based on the initial grep search
    # This has the side effect of making sure the vfs cache is hot
    sstate_hardcode_cmd = "%s | xargs %s | %s | xargs %s %s" % (sstate_scan_cmd, sstate_grep_cmd, sstate_filelist_cmd, xargs_no_empty_run_cmd, sstate_sed_cmd)

    bb.note("Removing hardcoded paths from sstate package: '%s'" % (sstate_hardcode_cmd))
    subprocess.check_output(sstate_hardcode_cmd, shell=True, cwd=sstate_builddir)

        # If the fixmefn is empty, remove it..
    if os.stat(fixmefn).st_size == 0:
        os.remove(fixmefn)
    else:
        bb.note("Replacing absolute paths in fixmepath file: '%s'" % (sstate_filelist_relative_cmd))
        subprocess.check_output(sstate_filelist_relative_cmd, shell=True)
}

def sstate_package(ss, d):
    import oe.path
    import time

    tmpdir = d.getVar('TMPDIR')

    sstatebuild = d.expand("${WORKDIR}/sstate-build-%s/" % ss['task'])
    sde = int(d.getVar("SOURCE_DATE_EPOCH") or time.time())
    d.setVar("SSTATE_CURRTASK", ss['task'])
    bb.utils.remove(sstatebuild, recurse=True)
    bb.utils.mkdirhier(sstatebuild)
    exit = False
    for state in ss['dirs']:
        if not os.path.exists(state[1]):
            continue
        srcbase = state[0].rstrip("/").rsplit('/', 1)[0]
        # Find and error for absolute symlinks. We could attempt to relocate but its not
        # clear where the symlink is relative to in this context. We could add that markup
        # to sstate tasks but there aren't many of these so better just avoid them entirely.
        for walkroot, dirs, files in os.walk(state[1]):
            for file in files + dirs:
                srcpath = os.path.join(walkroot, file)
                if not os.path.islink(srcpath):
                    continue
                link = os.readlink(srcpath)
                if not os.path.isabs(link):
                    continue
                if not link.startswith(tmpdir):
                    continue
                bb.error("sstate found an absolute path symlink %s pointing at %s. Please replace this with a relative link." % (srcpath, link))
                exit = True
        bb.debug(2, "Preparing tree %s for packaging at %s" % (state[1], sstatebuild + state[0]))
        bb.utils.rename(state[1], sstatebuild + state[0])
    if exit:
        bb.fatal("Failing task due to absolute path symlinks")

    workdir = d.getVar('WORKDIR')
    sharedworkdir = os.path.join(d.getVar('TMPDIR'), "work-shared")
    for plain in ss['plaindirs']:
        pdir = plain.replace(workdir, sstatebuild)
        if sharedworkdir in plain:
            pdir = plain.replace(sharedworkdir, sstatebuild)
        bb.utils.mkdirhier(plain)
        bb.utils.mkdirhier(pdir)
        bb.utils.rename(plain, pdir)

    d.setVar('SSTATE_BUILDDIR', sstatebuild)
    d.setVar('SSTATE_INSTDIR', sstatebuild)

    if d.getVar('SSTATE_SKIP_CREATION') == '1':
        return

    sstate_create_package = ['sstate_report_unihash', 'sstate_create_and_sign_package']

    for f in (d.getVar('SSTATECREATEFUNCS') or '').split() + \
             sstate_create_package + \
             (d.getVar('SSTATEPOSTCREATEFUNCS') or '').split():
        # All hooks should run in SSTATE_BUILDDIR.
        bb.build.exec_func(f, d, (sstatebuild,))

    # SSTATE_PKG may have been changed by sstate_report_unihash
    siginfo = d.getVar('SSTATE_PKG') + ".siginfo"
    if not os.path.exists(siginfo):
        bb.siggen.dump_this_task(siginfo, d)
    else:
        try:
            os.utime(siginfo, None)
        except PermissionError:
            pass
        except OSError as e:
            # Handle read-only file systems gracefully
            import errno
            if e.errno != errno.EROFS:
                raise e

    return

sstate_package[vardepsexclude] += "SSTATE_SIG_KEY SSTATE_PKG"

def pstaging_fetch(sstatefetch, d):
    import bb.fetch2

    # Only try and fetch if the user has configured a mirror
    mirrors = d.getVar('SSTATE_MIRRORS')
    if not mirrors:
        return

    # Copy the data object and override DL_DIR and SRC_URI
    localdata = bb.data.createCopy(d)

    dldir = localdata.expand("${SSTATE_DIR}")

    localdata.delVar('MIRRORS')
    localdata.setVar('FILESPATH', dldir)
    localdata.setVar('DL_DIR', dldir)
    localdata.setVar('PREMIRRORS', mirrors)

    # if BB_NO_NETWORK is set but we also have SSTATE_MIRROR_ALLOW_NETWORK,
    # we'll want to allow network access for the current set of fetches.
    if bb.utils.to_boolean(localdata.getVar('BB_NO_NETWORK')) and \
            bb.utils.to_boolean(localdata.getVar('SSTATE_MIRROR_ALLOW_NETWORK')):
        localdata.delVar('BB_NO_NETWORK')

    # Try a fetch from the sstate mirror, if it fails just return and
    # we will build the package
    uris = ['file://{0};downloadfilename={0}'.format(sstatefetch),
            'file://{0}.siginfo;downloadfilename={0}.siginfo'.format(sstatefetch)]
    if bb.utils.to_boolean(d.getVar("SSTATE_VERIFY_SIG"), False):
        uris += ['file://{0}.sig;downloadfilename={0}.sig'.format(sstatefetch)]

    with bb.utils.umask(bb.utils.to_filemode(d.getVar("OE_SHARED_UMASK"))):
        bb.utils.mkdirhier(dldir)

        for srcuri in uris:
            localdata.delVar('SRC_URI')
            localdata.setVar('SRC_URI', srcuri)
            try:
                fetcher = bb.fetch2.Fetch([srcuri], localdata, cache=False)
                fetcher.checkstatus()
                fetcher.download()

            except bb.fetch2.BBFetchException:
                pass

def sstate_setscene(d):
    shared_state = sstate_state_fromvars(d)
    accelerate = sstate_installpkg(shared_state, d)
    if not accelerate:
        msg = "No sstate archive obtainable, will run full task instead."
        bb.warn(msg)
        raise bb.BBHandledException(msg)

python sstate_task_prefunc () {
    shared_state = sstate_state_fromvars(d)
    sstate_clean(shared_state, d)
}
sstate_task_prefunc[dirs] = "${WORKDIR}"

python sstate_task_postfunc () {
    shared_state = sstate_state_fromvars(d)

    shared_umask = bb.utils.to_filemode(d.getVar("OE_SHARED_UMASK"))
    omask = os.umask(shared_umask)
    if omask != shared_umask:
       bb.note("Using umask %0o (not %0o) for sstate packaging" % (shared_umask, omask))
    sstate_package(shared_state, d)
    os.umask(omask)

    sstateinst = d.getVar("SSTATE_INSTDIR")
    d.setVar('SSTATE_FIXMEDIR', shared_state['fixmedir'])

    sstate_installpkgdir(shared_state, d)

    bb.utils.remove(d.getVar("SSTATE_BUILDDIR"), recurse=True)
}
sstate_task_postfunc[dirs] = "${WORKDIR}"

# Create a sstate package
# If enabled, sign the package.
# Package and signature are created in a sub-directory
# and renamed in place once created.
python sstate_create_and_sign_package () {
    from pathlib import Path

    # Best effort touch
    def touch(file):
        try:
            file.touch()
        except:
            pass

    def update_file(src, dst, force=False):
        if dst.is_symlink() and not dst.exists():
            force=True
        try:
            # This relies on that src is a temporary file that can be renamed
            # or left as is.
            if force:
                src.rename(dst)
            else:
                os.link(src, dst)
            return True
        except:
            pass

        if dst.exists():
            touch(dst)

        return False

    sign_pkg = (
        bb.utils.to_boolean(d.getVar("SSTATE_VERIFY_SIG")) and
        bool(d.getVar("SSTATE_SIG_KEY"))
    )

    sstate_pkg = Path(d.getVar("SSTATE_PKG"))
    sstate_pkg_sig = Path(str(sstate_pkg) + ".sig")
    if sign_pkg:
        if sstate_pkg.exists() and sstate_pkg_sig.exists():
            touch(sstate_pkg)
            touch(sstate_pkg_sig)
            return
    else:
        if sstate_pkg.exists():
            touch(sstate_pkg)
            return

    # Create the required sstate directory if it is not present.
    if not sstate_pkg.parent.is_dir():
        shared_umask = bb.utils.to_filemode(d.getVar("OE_SHARED_UMASK"))
        with bb.utils.umask(shared_umask):
            bb.utils.mkdirhier(str(sstate_pkg.parent))

    if sign_pkg:
        from tempfile import TemporaryDirectory
        with TemporaryDirectory(dir=sstate_pkg.parent) as tmp_dir:
            tmp_pkg = Path(tmp_dir) / sstate_pkg.name
            sstate_archive_package(tmp_pkg, d)

            from oe.gpg_sign import get_signer
            signer = get_signer(d, 'local')
            signer.detach_sign(str(tmp_pkg), d.getVar('SSTATE_SIG_KEY'), None,
                                d.getVar('SSTATE_SIG_PASSPHRASE'), armor=False)

            tmp_pkg_sig = Path(tmp_dir) / sstate_pkg_sig.name
            if not update_file(tmp_pkg_sig, sstate_pkg_sig):
                # If the created signature file could not be copied into place,
                # then we should not use the sstate package either.
                return

            # If the .sig file was updated, then the sstate package must also
            # be updated.
            update_file(tmp_pkg, sstate_pkg, force=True)
    else:
        from tempfile import NamedTemporaryFile
        with NamedTemporaryFile(prefix=sstate_pkg.name, dir=sstate_pkg.parent) as tmp_pkg_fd:
            tmp_pkg = tmp_pkg_fd.name
            sstate_archive_package(tmp_pkg, d)
            update_file(tmp_pkg, sstate_pkg)
            # update_file() may have renamed tmp_pkg, which must exist when the
            # NamedTemporaryFile() context handler ends.
            touch(Path(tmp_pkg))

}

# Function to generate a sstate package from the current directory.
# The calling function handles moving the sstate package into the final
# destination.
def sstate_archive_package(sstate_pkg, d):
    import subprocess

    cmd = [
        "tar",
        "-I", d.expand("pzstd -${SSTATE_ZSTD_CLEVEL} -p${ZSTD_THREADS}"),
        "-cS",
        "-f", sstate_pkg,
    ]

    # tar refuses to create an empty archive unless told explicitly
    files = sorted(os.listdir("."))
    if not files:
        files = ["--files-from=/dev/null"]

    try:
        subprocess.run(cmd + files, check=True)
    except subprocess.CalledProcessError as e:
        # Ignore error 1 as this is caused by files changing
        # (link count increasing from hardlinks being created).
        if e.returncode != 1:
            raise

    os.chmod(sstate_pkg, 0o664)


python sstate_report_unihash() {
    report_unihash = getattr(bb.parse.siggen, 'report_unihash', None)

    if report_unihash:
        ss = sstate_state_fromvars(d)
        report_unihash(os.getcwd(), ss['task'], d)
}

#
# Shell function to decompress and prepare a package for installation
# Will be run from within SSTATE_INSTDIR.
#
sstate_unpack_package () {
	ZSTD="zstd -T${ZSTD_THREADS}"
	# Use pzstd if available
	if [ -x "$(command -v pzstd)" ]; then
		ZSTD="pzstd -p ${ZSTD_THREADS}"
	fi

	tar -I "$ZSTD" -xvpf ${SSTATE_PKG}
	# update .siginfo atime on local/NFS mirror if it is a symbolic link
	[ ! -h ${SSTATE_PKG}.siginfo ] || [ ! -e ${SSTATE_PKG}.siginfo ] || touch -a ${SSTATE_PKG}.siginfo 2>/dev/null || true
	# update each symbolic link instead of any referenced file
	touch --no-dereference ${SSTATE_PKG} 2>/dev/null || true
	[ ! -e ${SSTATE_PKG}.sig ] || touch --no-dereference ${SSTATE_PKG}.sig 2>/dev/null || true
	[ ! -e ${SSTATE_PKG}.siginfo ] || touch --no-dereference ${SSTATE_PKG}.siginfo 2>/dev/null || true
}

BB_HASHCHECK_FUNCTION = "sstate_checkhashes"

def sstate_checkhashes(sq_data, d, siginfo=False, currentcount=0, summary=True, **kwargs):
    import itertools

    found = set()
    missed = set()

    def gethash(task):
        return sq_data['unihash'][task]

    def getpathcomponents(task, d):
        # Magic data from BB_HASHFILENAME
        splithashfn = sq_data['hashfn'][task].split(" ")
        spec = splithashfn[1]
        if splithashfn[0] == "True":
            extrapath = d.getVar("NATIVELSBSTRING") + "/"
        else:
            extrapath = ""
        
        tname = bb.runqueue.taskname_from_tid(task)[3:]

        if tname in ["fetch", "unpack", "patch", "populate_lic", "preconfigure"] and splithashfn[2]:
            spec = splithashfn[2]
            extrapath = ""

        return spec, extrapath, tname

    def getsstatefile(tid, siginfo, d):
        spec, extrapath, tname = getpathcomponents(tid, d)
        return extrapath + generate_sstatefn(spec, gethash(tid), tname, siginfo, d)

    for tid in sq_data['hash']:

        sstatefile = d.expand("${SSTATE_DIR}/" + getsstatefile(tid, siginfo, d))

        if os.path.exists(sstatefile):
            oe.utils.touch(sstatefile)
            found.add(tid)
            bb.debug(2, "SState: Found valid sstate file %s" % sstatefile)
        else:
            missed.add(tid)
            bb.debug(2, "SState: Looked for but didn't find file %s" % sstatefile)

    foundLocal = len(found)
    mirrors = d.getVar("SSTATE_MIRRORS")
    if mirrors:
        # Copy the data object and override DL_DIR and SRC_URI
        localdata = bb.data.createCopy(d)

        dldir = localdata.expand("${SSTATE_DIR}")
        localdata.delVar('MIRRORS')
        localdata.setVar('FILESPATH', dldir)
        localdata.setVar('DL_DIR', dldir)
        localdata.setVar('PREMIRRORS', mirrors)

        bb.debug(2, "SState using premirror of: %s" % mirrors)

        # if BB_NO_NETWORK is set but we also have SSTATE_MIRROR_ALLOW_NETWORK,
        # we'll want to allow network access for the current set of fetches.
        if bb.utils.to_boolean(localdata.getVar('BB_NO_NETWORK')) and \
                bb.utils.to_boolean(localdata.getVar('SSTATE_MIRROR_ALLOW_NETWORK')):
            localdata.delVar('BB_NO_NETWORK')

        from bb.fetch2 import FetchConnectionCache
        def checkstatus_init():
            while not connection_cache_pool.full():
                connection_cache_pool.put(FetchConnectionCache())

        def checkstatus_end():
            while not connection_cache_pool.empty():
                connection_cache = connection_cache_pool.get()
                connection_cache.close_connections()

        def checkstatus(arg):
            (tid, sstatefile) = arg

            connection_cache = connection_cache_pool.get()
            localdata2 = bb.data.createCopy(localdata)
            srcuri = "file://" + sstatefile
            localdata2.setVar('SRC_URI', srcuri)
            bb.debug(2, "SState: Attempting to fetch %s" % srcuri)

            import traceback

            try:
                fetcher = bb.fetch2.Fetch(srcuri.split(), localdata2,
                            connection_cache=connection_cache)
                fetcher.checkstatus()
                bb.debug(2, "SState: Successful fetch test for %s" % srcuri)
                found.add(tid)
                missed.remove(tid)
            except bb.fetch2.FetchError as e:
                bb.debug(2, "SState: Unsuccessful fetch test for %s (%s)\n%s" % (srcuri, repr(e), traceback.format_exc()))
            except Exception as e:
                bb.error("SState: cannot test %s: %s\n%s" % (srcuri, repr(e), traceback.format_exc()))

            connection_cache_pool.put(connection_cache)

            if progress:
                bb.event.fire(bb.event.ProcessProgress(msg, next(cnt_tasks_done)), d)
            bb.event.check_for_interrupts()

        tasklist = []
        for tid in missed:
            sstatefile = d.expand(getsstatefile(tid, siginfo, d))
            tasklist.append((tid, sstatefile))

        if tasklist:
            nproc = min(int(d.getVar("BB_NUMBER_THREADS")), len(tasklist))

            ## thread-safe counter
            cnt_tasks_done = itertools.count(start = 1)
            progress = len(tasklist) >= 100
            if progress:
                msg = "Checking sstate mirror object availability"
                bb.event.fire(bb.event.ProcessStarted(msg, len(tasklist)), d)

            # Have to setup the fetcher environment here rather than in each thread as it would race
            fetcherenv = bb.fetch2.get_fetcher_environment(d)
            with bb.utils.environment(**fetcherenv):
                bb.event.enable_threadlock()
                import concurrent.futures
                from queue import Queue
                connection_cache_pool = Queue(nproc)
                checkstatus_init()
                with concurrent.futures.ThreadPoolExecutor(max_workers=nproc) as executor:
                    executor.map(checkstatus, tasklist.copy())
                checkstatus_end()
                bb.event.disable_threadlock()

            if progress:
                bb.event.fire(bb.event.ProcessFinished(msg), d)

    inheritlist = d.getVar("INHERIT")
    if "toaster" in inheritlist:
        evdata = {'missed': [], 'found': []};
        for tid in missed:
            sstatefile = d.expand(getsstatefile(tid, False, d))
            evdata['missed'].append((bb.runqueue.fn_from_tid(tid), bb.runqueue.taskname_from_tid(tid), gethash(tid), sstatefile ) )
        for tid in found:
            sstatefile = d.expand(getsstatefile(tid, False, d))
            evdata['found'].append((bb.runqueue.fn_from_tid(tid), bb.runqueue.taskname_from_tid(tid), gethash(tid), sstatefile ) )
        bb.event.fire(bb.event.MetadataEvent("MissedSstate", evdata), d)

    if summary:
        # Print some summary statistics about the current task completion and how much sstate
        # reuse there was. Avoid divide by zero errors.
        total = len(sq_data['hash'])
        complete = 0
        if currentcount:
            complete = (len(found) + currentcount) / (total + currentcount) * 100
        match = 0
        if total:
            match = len(found) / total * 100
        bb.plain("Sstate summary: Wanted %d Local %d Mirrors %d Missed %d Current %d (%d%% match, %d%% complete)" %
            (total, foundLocal, len(found)-foundLocal, len(missed), currentcount, match, complete))

    if hasattr(bb.parse.siggen, "checkhashes"):
        bb.parse.siggen.checkhashes(sq_data, missed, found, d)

    return found
setscene_depvalid[vardepsexclude] = "SSTATE_EXCLUDEDEPS_SYSROOT _SSTATE_EXCLUDEDEPS_SYSROOT"

BB_SETSCENE_DEPVALID = "setscene_depvalid"

def setscene_depvalid(task, taskdependees, notneeded, d, log=None):
    # taskdependees is a dict of tasks which depend on task, each being a 3 item list of [PN, TASKNAME, FILENAME]
    # task is included in taskdependees too
    # Return - False - We need this dependency
    #        - True - We can skip this dependency
    import re

    def logit(msg, log):
        if log is not None:
            log.append(msg)
        else:
            bb.debug(2, msg)

    logit("Considering setscene task: %s" % (str(taskdependees[task])), log)

    directtasks = ["do_populate_lic", "do_deploy_source_date_epoch", "do_shared_workdir", "do_stash_locale", "do_gcc_stash_builddir", "do_create_spdx", "do_deploy_archives"]

    def isNativeCross(x):
        return x.endswith("-native") or "-cross-" in x or "-crosssdk" in x or x.endswith("-cross")

    # We only need to trigger deploy_source_date_epoch through direct dependencies
    if taskdependees[task][1] in directtasks:
        return True

    # We only need to trigger packagedata through direct dependencies
    # but need to preserve packagedata on packagedata links
    if taskdependees[task][1] == "do_packagedata":
        for dep in taskdependees:
            if taskdependees[dep][1] == "do_packagedata":
                return False
        return True

    for dep in taskdependees:
        logit("  considering dependency: %s" % (str(taskdependees[dep])), log)
        if task == dep:
            continue
        if dep in notneeded:
            continue
        # do_package_write_* and do_package doesn't need do_package
        if taskdependees[task][1] == "do_package" and taskdependees[dep][1] in ['do_package', 'do_package_write_deb', 'do_package_write_ipk', 'do_package_write_rpm', 'do_packagedata', 'do_package_qa']:
            continue
        # do_package_write_* need do_populate_sysroot as they're mainly postinstall dependencies
        if taskdependees[task][1] == "do_populate_sysroot" and taskdependees[dep][1] in ['do_package_write_deb', 'do_package_write_ipk', 'do_package_write_rpm']:
            return False
        # do_package/packagedata/package_qa/deploy don't need do_populate_sysroot
        if taskdependees[task][1] == "do_populate_sysroot" and taskdependees[dep][1] in ['do_package', 'do_packagedata', 'do_package_qa', 'do_deploy']:
            continue
        # Native/Cross packages don't exist and are noexec anyway
        if isNativeCross(taskdependees[dep][0]) and taskdependees[dep][1] in ['do_package_write_deb', 'do_package_write_ipk', 'do_package_write_rpm', 'do_packagedata', 'do_package', 'do_package_qa']:
            continue

        # Consider sysroot depending on sysroot tasks
        if taskdependees[task][1] == 'do_populate_sysroot' and taskdependees[dep][1] == 'do_populate_sysroot':
            # Allow excluding certain recursive dependencies. If a recipe needs it should add a
            # specific dependency itself, rather than relying on one of its dependees to pull
            # them in.
            # See also http://lists.openembedded.org/pipermail/openembedded-core/2018-January/146324.html
            not_needed = False
            excludedeps = d.getVar('_SSTATE_EXCLUDEDEPS_SYSROOT')
            if excludedeps is None:
                # Cache the regular expressions for speed
                excludedeps = []
                for excl in (d.getVar('SSTATE_EXCLUDEDEPS_SYSROOT') or "").split():
                    excludedeps.append((re.compile(excl.split('->', 1)[0]), re.compile(excl.split('->', 1)[1])))
                d.setVar('_SSTATE_EXCLUDEDEPS_SYSROOT', excludedeps)
            for excl in excludedeps:
                if excl[0].match(taskdependees[dep][0]):
                    if excl[1].match(taskdependees[task][0]):
                        not_needed = True
                        break
            if not_needed:
                continue
            # For meta-extsdk-toolchain we want all sysroot dependencies
            if taskdependees[dep][0] == 'meta-extsdk-toolchain':
                return False
            # Native/Cross populate_sysroot need their dependencies
            if isNativeCross(taskdependees[task][0]) and isNativeCross(taskdependees[dep][0]):
                return False
            # Target populate_sysroot depended on by cross tools need to be installed
            if isNativeCross(taskdependees[dep][0]):
                return False
            # Native/cross tools depended upon by target sysroot are not needed
            # Add an exception for shadow-native as required by useradd.bbclass
            if isNativeCross(taskdependees[task][0]) and taskdependees[task][0] != 'shadow-native':
                continue
            # Target populate_sysroot need their dependencies
            return False

        if taskdependees[dep][1] in directtasks:
            continue

        # Safe fallthrough default
        logit(" Default setscene dependency fall through due to dependency: %s" % (str(taskdependees[dep])), log)
        return False
    return True

addhandler sstate_eventhandler
sstate_eventhandler[eventmask] = "bb.build.TaskSucceeded"
python sstate_eventhandler() {
    d = e.data
    writtensstate = d.getVar('SSTATE_CURRTASK')
    if not writtensstate:
        taskname = d.getVar("BB_RUNTASK")[3:]
        spec = d.getVar('SSTATE_PKGSPEC')
        swspec = d.getVar('SSTATE_SWSPEC')
        if taskname in ["fetch", "unpack", "patch", "populate_lic", "preconfigure"] and swspec:
            d.setVar("SSTATE_PKGSPEC", "${SSTATE_SWSPEC}")
            d.setVar("SSTATE_EXTRAPATH", "")
        d.setVar("SSTATE_CURRTASK", taskname)
        siginfo = d.getVar('SSTATE_PKG') + ".siginfo"
        if not os.path.exists(siginfo):
            bb.siggen.dump_this_task(siginfo, d)
        else:
            oe.utils.touch(siginfo)
}

SSTATE_PRUNE_OBSOLETEWORKDIR ?= "1"

#
# Event handler which removes manifests and stamps file for recipes which are no
# longer 'reachable' in a build where they once were. 'Reachable' refers to
# whether a recipe is parsed so recipes in a layer which was removed would no
# longer be reachable. Switching between systemd and sysvinit where recipes
# became skipped would be another example.
#
# Also optionally removes the workdir of those tasks/recipes
#
addhandler sstate_eventhandler_reachablestamps
sstate_eventhandler_reachablestamps[eventmask] = "bb.event.ReachableStamps"
python sstate_eventhandler_reachablestamps() {
    import glob
    d = e.data
    stamps = e.stamps.values()
    removeworkdir = (d.getVar("SSTATE_PRUNE_OBSOLETEWORKDIR", False) == "1")
    preservestampfile = d.expand('${SSTATE_MANIFESTS}/preserve-stamps')
    preservestamps = []
    if os.path.exists(preservestampfile):
        with open(preservestampfile, 'r') as f:
            preservestamps = f.readlines()
    seen = []

    # The machine index contains all the stamps this machine has ever seen in this build directory.
    # We should only remove things which this machine once accessed but no longer does.
    machineindex = set()
    bb.utils.mkdirhier(d.expand("${SSTATE_MANIFESTS}"))
    mi = d.expand("${SSTATE_MANIFESTS}/index-machine-${MACHINE}")
    if os.path.exists(mi):
        with open(mi, "r") as f:
            machineindex = set(line.strip() for line in f.readlines())

    for a in sorted(list(set(d.getVar("SSTATE_ARCHS").split()))):
        toremove = []
        i = d.expand("${SSTATE_MANIFESTS}/index-" + a)
        if not os.path.exists(i):
            continue
        manseen = set()
        ignore = []
        with open(i, "r") as f:
            lines = f.readlines()
            for l in reversed(lines):
                try:
                    (stamp, manifest, workdir) = l.split()
                    # The index may have multiple entries for the same manifest as the code above only appends
                    # new entries and there may be an entry with matching manifest but differing version in stamp/workdir.
                    # The last entry in the list is the valid one, any earlier entries with matching manifests
                    # should be ignored.
                    if manifest in manseen:
                        ignore.append(l)
                        continue
                    manseen.add(manifest)
                    if stamp not in stamps and stamp not in preservestamps and stamp in machineindex:
                        toremove.append(l)
                        if stamp not in seen:
                            bb.debug(2, "Stamp %s is not reachable, removing related manifests" % stamp)
                            seen.append(stamp)
                except ValueError:
                    bb.fatal("Invalid line '%s' in sstate manifest '%s'" % (l, i))

        if toremove:
            msg = "Removing %d recipes from the %s sysroot" % (len(toremove), a)
            bb.event.fire(bb.event.ProcessStarted(msg, len(toremove)), d)

            removed = 0
            for r in toremove:
                (stamp, manifest, workdir) = r.split()
                for m in glob.glob(manifest + ".*"):
                    if m.endswith(".postrm"):
                        continue
                    sstate_clean_manifest(m, d)
                bb.utils.remove(stamp + "*")
                if removeworkdir:
                    bb.utils.remove(workdir, recurse = True)
                lines.remove(r)
                removed = removed + 1
                bb.event.fire(bb.event.ProcessProgress(msg, removed), d)
                bb.event.check_for_interrupts()

            bb.event.fire(bb.event.ProcessFinished(msg), d)

        with open(i, "w") as f:
            for l in lines:
                if l in ignore:
                    continue
                f.write(l)
    machineindex |= set(stamps)
    with open(mi, "w") as f:
        for l in machineindex:
            f.write(l + "\n")

    if preservestamps:
        os.remove(preservestampfile)
}


#
# Bitbake can generate an event showing which setscene tasks are 'stale',
# i.e. which ones will be rerun. These are ones where a stamp file is present but
# it is stable (e.g. taskhash doesn't match). With that list we can go through
# the manifests for matching tasks and "uninstall" those manifests now. We do
# this now rather than mid build since the distribution of files between sstate
# objects may have changed, new tasks may run first and if those new tasks overlap
# with the stale tasks, we'd see overlapping files messages and failures. Thankfully
# removing these files is fast.
#
addhandler sstate_eventhandler_stalesstate
sstate_eventhandler_stalesstate[eventmask] = "bb.event.StaleSetSceneTasks"
python sstate_eventhandler_stalesstate() {
    d = e.data
    tasks = e.tasks

    bb.utils.mkdirhier(d.expand("${SSTATE_MANIFESTS}"))

    for a in list(set(d.getVar("SSTATE_ARCHS").split())):
        toremove = []
        i = d.expand("${SSTATE_MANIFESTS}/index-" + a)
        if not os.path.exists(i):
            continue
        with open(i, "r") as f:
            lines = f.readlines()
            for l in lines:
                try:
                    (stamp, manifest, workdir) = l.split()
                    for tid in tasks:
                        for s in tasks[tid]:
                            if s.startswith(stamp):
                                taskname = bb.runqueue.taskname_from_tid(tid)[3:]
                                manname = manifest + "." + taskname
                                if os.path.exists(manname):
                                    bb.debug(2, "Sstate for %s is stale, removing related manifest %s" % (tid, manname))
                                    toremove.append((manname, tid, tasks[tid]))
                                    break
                except ValueError:
                    bb.fatal("Invalid line '%s' in sstate manifest '%s'" % (l, i))

        if toremove:
            msg = "Removing %d stale sstate objects for arch %s" % (len(toremove), a)
            bb.event.fire(bb.event.ProcessStarted(msg, len(toremove)), d)

            removed = 0
            for (manname, tid, stamps) in toremove:
                sstate_clean_manifest(manname, d)
                for stamp in stamps:
                    bb.utils.remove(stamp)
                removed = removed + 1
                bb.event.fire(bb.event.ProcessProgress(msg, removed), d)
                bb.event.check_for_interrupts()

            bb.event.fire(bb.event.ProcessFinished(msg), d)
}