mktemp: add -t and fix behavior.

The new tests pass on the host (coreutils 8.28) and with toybox after
this patch is applied.

2 files changed, 37 insertions, 13 deletions

diff --git a/tests/mktemp.test b/tests/mktemp.test
new file mode 100755
index 00000000..d09d2c4c
--- /dev/null
+++ b/tests/mktemp.test
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+[ -f testing.sh ] && . testing.sh
+
+#testing "name" "command" "result" "infile" "stdin"
+
+# mktemp by default should use tmp.XXXXXXXXXX as the template,
+# and $TMPDIR as the directory.
+testing "mktemp" "TMPDIR=/t mktemp -u | grep -q '^/t/tmp\...........$' && echo yes" "yes\n" "" ""
+
+# mktemp with a template should *not* use $TMPDIR.
+testing "mktemp TEMPLATE" "TMPDIR=/t mktemp -u hello.XXXXXXXX | grep -q '^hello\.........$' && echo yes" "yes\n" "" ""
+
+# mktemp with -t and a template should use $TMPDIR.
+testing "mktemp -t TEMPLATE" "TMPDIR=/t mktemp -u -t hello.XXXXXXXX | grep -q '^/t/hello\.........$' && echo yes" "yes\n" "" ""
+
+# mktemp with -p DIR and a template should use DIR.
+testing "mktemp -p DIR TEMPLATE" "TMPDIR=/t mktemp -u -p DIR hello.XXXXXXXX | grep -q '^DIR/hello\.........$' && echo yes" "yes\n" "" ""
+
+# mktemp -p DIR and -t: -t wins.
+testing "mktemp -p DIR -t TEMPLATE" "TMPDIR=/t mktemp -u -p DIR -t hello.XXXXXXXX | grep -q '^/t/hello\.........$' && echo yes" "yes\n" "" ""
diff --git a/toys/lsb/mktemp.c b/toys/lsb/mktemp.c
index 21bb9b36..440cf6b1 100644
--- a/toys/lsb/mktemp.c
+++ b/toys/lsb/mktemp.c
@@ -4,7 +4,7 @@
  *
  * http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/mktemp.html
 
-USE_MKTEMP(NEWTOY(mktemp, ">1uqd(directory)p(tmpdir):", TOYFLAG_BIN))
+USE_MKTEMP(NEWTOY(mktemp, ">1uqd(directory)p(tmpdir):t", TOYFLAG_BIN))
 
 config MKTEMP
   bool "mktemp"
@@ -17,11 +17,11 @@ config MKTEMP
     -d	Create directory instead of file (--directory)
     -p	Put new file in DIR (--tmpdir)
     -q	Quiet, no error messages
+    -t	Prepend $TMPDIR or /tmp if unset
     -u	Don't create anything, just print what would be created
 
     Each X in TEMPLATE is replaced with a random printable character. The
-    default TEMPLATE is tmp.XXXXXX, and the default DIR is $TMPDIR if set,
-    else "/tmp".
+    default TEMPLATE is tmp.XXXXXXXXXX.
 */
 
 #define FOR_mktemp
@@ -33,24 +33,27 @@ GLOBALS(
 
 void mktemp_main(void)
 {
-  int d_flag = toys.optflags & FLAG_d;
   char *template = *toys.optargs;
 
-  if (!template) template = "tmp.XXXXXX";
+  if (!template) {
+    toys.optflags |= FLAG_t;
+    template = "tmp.XXXXXXXXXX";
+  }
 
-  if (!TT.p) TT.p = getenv("TMPDIR");
+  if (!TT.p || (toys.optflags & FLAG_t)) TT.p = getenv("TMPDIR");
   if (!TT.p || !*TT.p) TT.p = "/tmp";
 
-  template = strchr(template, '/') ? xstrdup(template)
-             : xmprintf("%s/%s", TT.p, template);
+  // TODO: coreutils cleans paths, so -p /t/// would result in /t/xxx...
+  template = (strchr(template, '/') || !(toys.optflags & (FLAG_p|FLAG_t)))
+      ? xstrdup(template) : xmprintf("%s/%s", TT.p, template);
 
-  if (d_flag ? !mkdtemp(template) : mkstemp(template) == -1) {
+  if (toys.optflags & FLAG_u) {
+    mktemp(template);
+    xputs(template);
+  } else if (toys.optflags & FLAG_d ? !mkdtemp(template) : mkstemp(template) == -1) {
     if (toys.optflags & FLAG_q) toys.exitval = 1;
     else perror_exit("Failed to create %s %s/%s",
-                     d_flag ? "directory" : "file", TT.p, template);
-  } else {
-    if (toys.optflags & FLAG_u) unlink(template);
-    xputs(template);
+        toys.optflags & FLAG_d ? "directory" : "file", TT.p, template);
   }
 
   if (CFG_TOYBOX_FREE) free(template);