work dir v4: delete invalid armhf triplet pkgs (!1801)

Alpine's abuild has a arch_to_hostspec function, which translates an
architecture name ("x86_64") to a hostspec triplet
("x86_64-alpine-linux-musl"). We are using this function in some
APKBUILDs in pmaports.git. The triplet had been changed in [1] and
now we must rebuild all relevant packages, or we will run into weird
issues like [2].

As some of these packages are generated with "pmbootstrap aportgen",
we can't simply bump the pkgrel and force a rebuild. That would break
the upstream compatibility checks, which rely on pkgver and pkgrel
being the same as the originating packages from Alpine.

Create a new workdir version with a migration that zaps the chroots and
deletes the affected package versions from the cache. Before this gets
merged, I will rebuild the affected packages in the binary package
repository, so pmbootstrap will always use the fixed packages after the
migration.

[1] https://github.com/alpinelinux/abuild/pull/56
[2] https://gitlab.com/postmarketOS/pmaports/issues/295

pmb/config/__init__.py

@@ -45,7 +45,7 @@ pmaports_min_version = "4"
 # Version of the work folder (as asked during 'pmbootstrap init'). Increase
 # this number, whenever migration is required and provide the migration code,
 # see migrate_work_folder()).
-work_version = 3
+work_version = 4
 
 # Keys saved in the config file (mostly what we ask in 'pmbootstrap init')
 config_keys = ["ccache_size", "device", "extra_packages", "hostname", "jobs",

pmb/helpers/other.py

@@ -16,6 +16,7 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with pmbootstrap.  If not, see <http://www.gnu.org/licenses/>.
 """
+import glob
 import logging
 import os
 import re
@@ -75,6 +76,24 @@ def check_binfmt_misc(args):
                        " armhf on x86_64):\n See: <" + link + ">")
 
 
+def delete_apk(args, pkgname, version):
+    """
+    Remove a cached binary package for all arches.
+
+    :param pkgname: package name (e.g. "binutils-armhf")
+    :param version: $pkgver-r$pkgrel (e.g. "1.0.0-r2")
+    """
+    pattern = args.work + "/cache_apk_*/" + pkgname + "-" + version + ".*.apk"
+    matches = glob.glob(pattern)
+    logging.info("(native) Removing package: " + pkgname + "-" + version)
+    if not matches:
+        logging.info("(native) (Package not found, nothing to do.)")
+        return
+    for match in matches:
+        logging.info("(native) % rm " + match)
+        pmb.helpers.run.root(args, ["rm", match])
+
+
 def migrate_success(args, version):
     logging.info("Migration to version " + str(version) + " done")
     with open(args.work + "/version", "w") as handle:
@@ -154,6 +173,31 @@ def migrate_work_folder(args):
         migrate_success(args, 3)
         current = 3
 
+    if current == 3:
+        logging.info("Changelog:")
+        logging.info("* armhf triplet was changed in abuild (pmaports#295)")
+        logging.info("Migration will do the following:")
+        logging.info("* Zap your chroots")
+        logging.info("* Delete invalid armhf packages from cache")
+        logging.info("Note:")
+        logging.info("* If you are getting strange compiling errors when")
+        logging.info("  compiling to armhf (and other arches work fine!),")
+        logging.info("  then the invalid packages are probably still")
+        logging.info("  cached in your network. In that case, ask in the chat")
+        logging.info("  for advice: https://postmarketos.org/chat")
+        if not pmb.helpers.cli.confirm(args):
+            raise RuntimeError("Aborted.")
+
+        pmb.chroot.zap(args, False)
+        delete_apk(args, "binutils-armhf", "2.31.1-r2")
+        delete_apk(args, "busybox-static-armhf", "1.30.1-r2")
+        delete_apk(args, "gcc-armhf", "8.3.0-r0")
+        delete_apk(args, "gcc4-armhf", "9999-r1")
+        delete_apk(args, "gcc6-armhf", "9999-r6")
+        delete_apk(args, "musl-armhf", "1.1.22-r2")
+        migrate_success(args, 4)
+        current = 4
+
     # Can't migrate, user must delete it
     if current != required:
         raise RuntimeError("Sorry, we can't migrate that automatically. Please"