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authorMartin Pitt <martin.pitt@ubuntu.com>2015-05-27 09:56:03 +0200
committerMartin Pitt <martin.pitt@ubuntu.com>2015-05-29 17:40:12 +0200
commit5d409034017e9f9f8c4392157d95511fc2e05d87 (patch)
treee0223a0ec6b7ec9c516e00370da305e5f8c2d96a /src/core
parent2fe9e87a2475d5c2f5e2bb1a7e711c59fd0b2c6d (diff)
path-util: Fix path_is_mount_point for files
Commits 27cc6f166 and f25afeb broke path_is_mount_point() for files (such as /etc/machine-id → /run/machine-id bind mounts) as with the factorization of fd_is_mount_point() we lost the parent directory. We cannot determine that from an fd only as openat(fd, "..") only works for directory fds. Change fd_is_mount_point() to behave like openat(): It now takes a file descriptor of the containing directory, a file name in it, and flags (which can be 0 or AT_SYMLINK_FOLLOW). Unlike name_to_handle_at() or openat(), fstatat() only accepts the inverse flag AT_SYMLINK_NOFOLLOW and complains with EINVAL about AT_SYMLINK_FOLLOW; so we need to transform the flags for that fallback. Adjust rm_rf_children() accordingly (only other caller of fd_is_mount_point() aside from path_is_mount_point()). Add test cases for files, links, and file bind mounts (the latter will only work when running as root). Split out a new test_path_is_mount_point() test case function as it got significantly larger now.
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