core: chroot: add .exists() method (MR 2252)

Add a method to determine if a chroot exists.

Signed-off-by: Caleb Connolly <caleb@postmarketos.org>

pmb/chroot/init.py

@@ -115,7 +115,7 @@ def init(chroot: Chroot, usr_merge=UsrMerge.AUTO):
 
     pmb.chroot.mount(chroot)
     mark_in_chroot(chroot)
-    if (chroot / "bin/sh").is_symlink():
+    if chroot.exists():
         pmb.config.workdir.chroot_check_channel(chroot)
         copy_resolv_conf(chroot)
         pmb.chroot.apk.update_repository_list(chroot)

pmb/chroot/zap.py

@@ -159,7 +159,7 @@ def zap_pkgs_online_mismatch(confirm=True, dry=False):
         # Skip if chroot does not exist
         # FIXME: should we init the buildroot to do it anyway?
         # what if we run apk.static with --arch instead?
-        if not chroot.path.is_dir():
+        if not chroot.exists():
             continue
 
         # Clean the cache with apk

pmb/core/chroot.py

@@ -74,6 +74,10 @@ class Chroot:
         return Path(get_context().config.work, self.dirname)
 
 
+    def exists(self) -> bool:
+        return (self / "bin/sh").is_symlink()
+
+
     @property
     def arch(self) -> Arch:
         if self.type == ChrootType.NATIVE: