[PATCH v3 12/16] apt-fetcher: implement support for unshare backend

'Felix Moessbauer' via isar-users
2026-04-07T14:23:42Z

meta/lib/aptsrc_fetcher.py | 75 ++++++++++++++++++++++++++++++++++++++
1 file changed, 75 insertions(+)

diff --git a/meta/lib/aptsrc_fetcher.py b/meta/lib/aptsrc_fetcher.py
index 1d133aae..933480ea 100644
--- a/meta/lib/aptsrc_fetcher.py
+++ b/meta/lib/aptsrc_fetcher.py
@@ -7,10 +7,13 @@ from bb.fetch2 import FetchError
from bb.fetch2 import FetchMethod
from bb.fetch2 import logger
from bb.fetch2 import runfetchcmd
+import os

class AptSrc(FetchMethod):
@classmethod
def create(cls, d):
+ if d.getVar('ISAR_CHROOT_MODE') == 'unshare':
+ return AptSrcUnshare()
return AptSrcSchroot()

def supports(self, ud, d):
@@ -92,3 +95,75 @@ class AptSrcSchroot(AptSrc):
finally:
runfetchcmd(f'schroot -q -f -e -c {session_id}', d)
bb.build.exec_func('schroot_delete_configs', d)
+
+
+class AptSrcUnshare(AptSrc):
+ def _setup_chroot(self, rootfsdir, d):
+ sbuild_chroot = d.getVar('SBUILD_CHROOT')
+ unshare_cmd = d.getVar('RUN_PRIVILEGED_CMD')
+
+ runfetchcmd(
+ f'''
+{unshare_cmd} /bin/bash -s <<EOF
+ mkdir -p {rootfsdir}
+ tar -xf {sbuild_chroot} -C {rootfsdir}
+ cp /etc/resolv.conf {os.path.join(rootfsdir, 'etc/resolv.conf')}
+EOF
+ ''', d)
+ logger.info(f'rootfs extracted to: {rootfsdir}')
+
+ def _teardown_chroot(self, rootfsdir, d):
+ unshare_cmd = d.getVar('RUN_PRIVILEGED_CMD')
+ runfetchcmd(f'{unshare_cmd} rm -rf {rootfsdir}', d)
+
+ def download(self, ud, d):
+ bb.utils.exec_flat_python_func('isar_export_proxies', d)
+
+ workdir = d.getVar('WORKDIR')
+ rootfsdir = os.path.join(workdir, 'rootfs-fetcher')
+ unshare_cmd = d.getVar('RUN_PRIVILEGED_CMD')
+
+ if not os.path.exists(os.path.join(rootfsdir, 'etc')):
+ self._setup_chroot(rootfsdir, d)
+
+ repo_isar_dir = d.getVar('REPO_ISAR_DIR')
+ lockfile = bb.utils.lockfile(f'{repo_isar_dir}/isar.lock')
+ os.makedirs(self.localpath(ud, d))
+
+ try:
+ runfetchcmd(f'''
+set -e
+{unshare_cmd} /bin/bash -s <<'EOF' | tar -C {self.localpath(ud, d)} -x
+ chroot {rootfsdir} /bin/bash -c '
+ set -e
+ TMPDIR=$(mktemp -d)
+ mkdir -p $TMPDIR/{ud.localfile}
+ cd $TMPDIR/{ud.localfile}
+ apt-get -y -oDebug::NoLocking=1 --download-only --only-source source {ud.src_package} >/dev/null;
+ tar -c --owner=0 --group=0 --numeric-owner .
+ '
+EOF
+ ''', d)
+ except (OSError, FetchError):
+ raise
+ finally:
+ bb.utils.unlockfile(lockfile)
+ self._teardown_chroot(rootfsdir, d)
+
+ def unpack(self, ud, rootdir, d):
+ workdir = d.getVar('WORKDIR')
+ rootfsdir = os.path.join(workdir, 'rootfs-fetcher')
+ extractto = f'{d.getVar("S")}.dpkg'
+ bb.utils.remove(extractto, recurse=True)
+
+ try:
+ runfetchcmd(f'''
+ set -e
+ find {self.localpath(ud, d)} -print -type f -name '*.dsc' -exec dpkg-source -su -x {{}} {extractto} \\;
+ find {extractto} -mindepth 1 -maxdepth 1 -exec mv {{}} {d.getVar('S')}/ \\;
+ ''', d)
+ except (OSError, FetchError):
+ raise
+ finally:
+ bb.utils.remove(extractto, recurse=True)
+ self._teardown_chroot(rootfsdir, d)
--
2.53.0

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