remove local postmarketOS mirror folder support (!1718)

Obscure feature: it was possible to specify a local path as
--mirror-pmOS. It would then get mounted to /mnt/postmarketos-mirror
inside the chroot, and be specified as such in the generated
/etc/apk/repositories file.

I had used this once for some testing scripts, but I am sure nobody is
using this anymore. The same can be achieved with running a local http
server anyway:
<https://wiki.postmarketos.org/wiki/Installing_packages_on_a_running_phone>

Removing this makes it easier to support multiple postmarketOS mirrors
(next commit).

pmb/chroot/mount.py

@@ -97,11 +97,6 @@ def mount(args, suffix="native"):
         source = source.replace("$ARCH", arch)
         mountpoints[source] = target
 
-    # Add the pmOS binary repo (in case it is set and points to a local folder)
-    mirror = args.mirror_postmarketos
-    if os.path.exists(mirror):
-        mountpoints[mirror] = "/mnt/postmarketos-mirror"
-
     # Mount if necessary
     for source, target in mountpoints.items():
         target_full = args.work + "/chroot_" + suffix + target

pmb/helpers/repo.py

@@ -68,10 +68,7 @@ def urls(args, user_repository=True, postmarketos_mirror=True):
 
     # Upstream postmarketOS binary repository
     if postmarketos_mirror and args.mirror_postmarketos:
-        if os.path.exists(args.mirror_postmarketos):
-            ret.append("/mnt/postmarketos-mirror")
-        else:
-            ret.append(args.mirror_postmarketos)
+        ret.append(args.mirror_postmarketos)
 
     # Upstream Alpine Linux repositories
     directories = ["main", "community"]
@@ -98,11 +95,7 @@ def apkindex_files(args, arch=None):
     urls_todo = []
     mirror = args.mirror_postmarketos
     if mirror:
-        if os.path.exists(mirror):
-            ret.append(mirror + "/" + arch + "/APKINDEX.tar.gz")
-        else:
-            # Non-local path: treat it like other URLs
-            urls_todo.append(mirror)
+        urls_todo.append(mirror)
 
     # Resolve the APKINDEX.$HASH.tar.gz files
     urls_todo += urls(args, False, False)