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authorJakob Unterwurzacher2019-01-20 13:10:59 +0100
committerJakob Unterwurzacher2019-01-20 13:10:59 +0100
commit3d6b2685fb926b40b4eb528a8cbdc3871444d492 (patch)
tree8617e715beb8695248ccaac14b76cd6eb5ca756d /internal/syscallcompat/sys_common.go
parent0805a63df1b5f915b228727f6074c2506922d0ad (diff)
Revert "syscallcompat: drop Faccessat AT_SYMLINK_NOFOLLOW helper"
Breaks mounting on MacOS: unix.Faccessat on Darwin does NOT (yet) support AT_SYMLINK_NOFOLLOW. See d44fe89ba4f3252c5bd00c4f7730197732f2a26a . This reverts commit 0805a63df1b5f915b228727f6074c2506922d0ad.
Diffstat (limited to 'internal/syscallcompat/sys_common.go')
-rw-r--r--internal/syscallcompat/sys_common.go15
1 files changed, 15 insertions, 0 deletions
diff --git a/internal/syscallcompat/sys_common.go b/internal/syscallcompat/sys_common.go
index aedc4da..b6bbdff 100644
--- a/internal/syscallcompat/sys_common.go
+++ b/internal/syscallcompat/sys_common.go
@@ -29,6 +29,21 @@ func Readlinkat(dirfd int, path string) (string, error) {
}
}
+// Faccessat exists both in Linux and in MacOS 10.10+, but the Linux version
+// DOES NOT support any flags. Emulate AT_SYMLINK_NOFOLLOW like glibc does.
+func Faccessat(dirfd int, path string, mode uint32) error {
+ var st unix.Stat_t
+ err := Fstatat(dirfd, path, &st, unix.AT_SYMLINK_NOFOLLOW)
+ if err != nil {
+ return err
+ }
+ if st.Mode&syscall.S_IFMT == syscall.S_IFLNK {
+ // Pretend that a symlink is always accessible
+ return nil
+ }
+ return unix.Faccessat(dirfd, path, mode, 0)
+}
+
// Openat wraps the Openat syscall.
func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) {
if flags&syscall.O_CREAT != 0 {