Turns out O_TMPFILE can fail in interesting ways when the underlying
filesystem doesn't support unnamed inodes, e.g. Azure used by GitHub
Actions. Here's the exact qoute from open(2):
"O_TMPFILE requires support by the underlying filesystem; only a
subset of Linux filesystems provide that support. In the initial
implementation, support was provided in the ext2, ext3, ext4, UDF,
Minix, and shmem filesystems. Support for other filesystems has
subsequently been added as follows: XFS (Linux 3.15); Btrfs (Linux
3.16); F2FS (Linux 3.16); and ubifs (Linux 4.9)"
This patch adds a silent fallback to tmpfile() in these cases.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
Joachim Wiberg
3d2a975f11