[LTP] [PATCH v1] tst_cgroup: use tmpdir

[Petr Vorel]

Hi Edward,

Reviewed-by: Petr Vorel <pvorel@suse.cz>

Although it's oke to have 3 lines duplicate, it'd be better to put it into
function, because we already have few places with this code
(_supported_fs_types.c, getcwd02.c, filecaps_common.h, openposix: tempfile.h).

I'm not sure myself for a correct place, maybe some file in lib/*.c, which uses
tst_fs.h (maybe we could merge some of these files which contain single function
into tst_fs.c and put new function here).

I'm ok to merge it as is and find correct place as another effort.

Kind regards,
Petr

> Use tmpdir instead of hardcoded /tmp path.

> Signed-off-by: Edward Liaw <edliaw@google.com>
> ---
>  lib/tst_cgroup.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)

> diff --git a/lib/tst_cgroup.c b/lib/tst_cgroup.c
> index 6c015e4f8..458b823f2 100644
> --- a/lib/tst_cgroup.c
> +++ b/lib/tst_cgroup.c
> @@ -290,7 +290,7 @@ static struct cgroup_ctrl controllers[] = {
>  static const char *cgroup_ltp_dir = "ltp";
>  static const char *cgroup_ltp_drain_dir = "drain";
>  static char cgroup_test_dir[NAME_MAX + 1];
> -static const char *cgroup_mount_ltp_prefix = "/tmp/cgroup_";
> +static const char *cgroup_mount_ltp_prefix = "cgroup_";
>  static const char *cgroup_v2_ltp_mount = "unified";

>  #define first_root				\
> @@ -645,8 +645,12 @@ static void cgroup_mount_v2(void)
>  {
>  	int ret;
>  	char mnt_path[PATH_MAX];
> +	const char *tmpdir = getenv("TMPDIR");
> +	if (!tmpdir)
> +		tmpdir = "/tmp";

> -	sprintf(mnt_path, "%s%s", cgroup_mount_ltp_prefix, cgroup_v2_ltp_mount);
> +	sprintf(mnt_path, "%s/%s%s",
> +		tmpdir, cgroup_mount_ltp_prefix, cgroup_v2_ltp_mount);

>  	if (!mkdir(mnt_path, 0777)) {
>  		roots[0].mnt_dir.we_created_it = 1;
> @@ -693,6 +697,9 @@ static void cgroup_mount_v1(struct cgroup_ctrl *const ctrl)
>  {
>  	char mnt_path[PATH_MAX];
>  	int made_dir = 0;
> +	const char *tmpdir = getenv("TMPDIR");
> +	if (!tmpdir)
> +		tmpdir = "/tmp";

>  	if (ctrl->ctrl_indx == CTRL_BLKIO && controllers[CTRL_IO].ctrl_root) {
>  		tst_res(TCONF,
> @@ -700,7 +707,8 @@ static void cgroup_mount_v1(struct cgroup_ctrl *const ctrl)
>  		return;
>  	}

> -	sprintf(mnt_path, "%s%s", cgroup_mount_ltp_prefix, ctrl->ctrl_name);
> +	sprintf(mnt_path, "%s/%s%s",
> +		tmpdir, cgroup_mount_ltp_prefix, ctrl->ctrl_name);

>  	if (!mkdir(mnt_path, 0777)) {
>  		made_dir = 1;