git: 2f11393fee4d - main - libbe: don't hardcode /tmp

The branch main has been updated by kevans:

URL: https://cgit.FreeBSD.org/src/commit/?id=2f11393fee4d60d38634a261edf9aa9fea39c75c

commit 2f11393fee4d60d38634a261edf9aa9fea39c75c
Author:     Kyle Evans <kevans@FreeBSD.org>
AuthorDate: 2025-04-21 03:47:59 +0000
Commit:     Kyle Evans <kevans@FreeBSD.org>
CommitDate: 2025-04-21 03:49:28 +0000

    libbe: don't hardcode /tmp
    
    Respect $TMPDIR if it's set, fallback to _PATH_TMP (not hardcoded /tmp)
    if it's not.
    
    Bump .Dd after recent commits.
    
    Reviewed by:    rcm
    Differential Revision:  https://reviews.freebsd.org/D42244
---
 lib/libbe/be_access.c | 14 ++++++++++++--
 lib/libbe/libbe.3     |  6 +++++-
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/lib/libbe/be_access.c b/lib/libbe/be_access.c
index 51f5a75e957d..44e7eb1e651c 100644
--- a/lib/libbe/be_access.c
+++ b/lib/libbe/be_access.c
@@ -33,7 +33,7 @@
 #include "be.h"
 #include "be_impl.h"
 
-#define	LIBBE_MOUNT_PREFIX	"be_mount."	/* XXX */
+#define	LIBBE_MOUNT_PREFIX	"be_mount."
 
 struct be_mountcheck_info {
 	const char *path;
@@ -261,7 +261,17 @@ be_mount(libbe_handle_t *lbh, const char *bootenv, const char *mountpoint,
 
 	/* Create mountpoint if it is not specified */
 	if (mountpoint == NULL) {
-		strlcpy(mnt_temp, "/tmp/be_mount.XXXX", sizeof(mnt_temp));
+		const char *tmpdir;
+
+		tmpdir = getenv("TMPDIR");
+		if (tmpdir == NULL)
+			tmpdir = _PATH_TMP;
+
+		if (snprintf(mnt_temp, sizeof(mnt_temp), "%s%s%sXXXX", tmpdir,
+		    tmpdir[strlen(tmpdir) - 1] == '/' ? "" : "/",
+		     LIBBE_MOUNT_PREFIX) >= (int)sizeof(mnt_temp))
+			return (set_error(lbh, BE_ERR_PATHLEN));
+
 		if (mkdtemp(mnt_temp) == NULL)
 			return (set_error(lbh, BE_ERR_IO));
 	}
diff --git a/lib/libbe/libbe.3 b/lib/libbe/libbe.3
index 113763311796..3b10711dd0f9 100644
--- a/lib/libbe/libbe.3
+++ b/lib/libbe/libbe.3
@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd April 9, 2024
+.Dd April 20, 2025
 .Dt LIBBE 3
 .Os
 .Sh NAME
@@ -358,6 +358,10 @@ If
 is
 .Dv NULL ,
 a mount point will be generated in
+.Ev TMPDIR
+or, if
+.Ev TMPDIR
+is not set,
 .Pa /tmp
 using
 .Xr mkdtemp 3 .