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util: add rename_noreplace

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renameat2() exists since Linux 3.15 but btrfs support for the flag
RENAME_NOREPLACE was added later.

This patch implements a fallback when renameat2() returns EINVAL.
EINVAL is the error returned when the filesystem does not support one of
the flags.
This commit is contained in:
Alban Crequy
2015-03-10 18:23:46 +01:00
committed by Lennart Poettering
parent 27cc6f166b
commit f85ef957e6
9 changed files with 69 additions and 15 deletions
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src/shared/machine-pool.c
+3 -2
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@@ -140,8 +140,9 @@ static int setup_machine_raw(uint64_t size, sd_bus_error *error) {
goto fail;
}
if (renameat2(AT_FDCWD, tmp, AT_FDCWD, "/var/lib/machines.raw", RENAME_NOREPLACE) < 0) {
r = sd_bus_error_set_errnof(error, errno, "Failed to move /var/lib/machines.raw into place: %m");
r = rename_noreplace(AT_FDCWD, tmp, AT_FDCWD, "/var/lib/machines.raw");
if (r < 0) {
sd_bus_error_set_errnof(error, r, "Failed to move /var/lib/machines.raw into place: %m");
goto fail;
}