ash: fix a bug in >${varexp} handling. Closes 5282

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

3 files changed, 26 insertions, 10 deletions

diff --git a/shell/ash.c b/shell/ash.c
index d197fa19a..e23b2034d 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -23,8 +23,9 @@
  *      define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
  *      define DEBUG=2 to compile in and turn on debugging.
  *
- * When debugging is on, debugging info will be written to ./trace and
- * a quit signal will generate a core dump.
+ * When debugging is on (DEBUG is 1 and "set -o debug" was executed),
+ * debugging info will be written to ./trace and a quit signal
+ * will generate a core dump.
  */
 #define DEBUG 0
 /* Tweak debug output verbosity here */
@@ -5105,15 +5106,14 @@ openredirect(union node *redir)
         char *fname;
         int f;
 
+        fname = redir->nfile.expfname;
         switch (redir->nfile.type) {
         case NFROM:
-                fname = redir->nfile.expfname;
                 f = open(fname, O_RDONLY);
                 if (f < 0)
                         goto eopen;
                 break;
         case NFROMTO:
-                fname = redir->nfile.expfname;
                 f = open(fname, O_RDWR|O_CREAT, 0666);
                 if (f < 0)
                         goto ecreate;
@@ -5124,7 +5124,6 @@ openredirect(union node *redir)
 #endif
                 /* Take care of noclobber mode. */
                 if (Cflag) {
-                        fname = redir->nfile.expfname;
                         f = noclobberopen(fname);
                         if (f < 0)
                                 goto ecreate;
@@ -5132,13 +5131,11 @@ openredirect(union node *redir)
                 }
                 /* FALLTHROUGH */
         case NCLOBBER:
-                fname = redir->nfile.expfname;
                 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
                 if (f < 0)
                         goto ecreate;
                 break;
         case NAPPEND:
-                fname = redir->nfile.expfname;
                 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
                 if (f < 0)
                         goto ecreate;
@@ -6138,7 +6135,9 @@ argstr(char *p, int flags, struct strlist *var_str_list)
                         length++;
                         goto addquote;
                 case CTLVAR:
+                        TRACE(("argstr: evalvar('%s')\n", p));
                         p = evalvar(p, flags, var_str_list);
+                        TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
                         goto start;
                 case CTLBACKQ:
                         c = '\0';
@@ -6846,8 +6845,7 @@ evalvar(char *p, int flags, struct strlist *var_str_list)
                 patloc = expdest - (char *)stackblock();
                 if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
                                 startloc, varflags,
-//TODO: | EXP_REDIR too? All other such places do it too
-                                /* quotes: */ flags & (EXP_FULL | EXP_CASE),
+                                /* quotes: */ flags & (EXP_FULL | EXP_CASE | EXP_REDIR),
                                 var_str_list)
                 ) {
                         int amount = expdest - (
@@ -7249,6 +7247,7 @@ expandarg(union node *arg, struct arglist *arglist, int flag)
         STARTSTACKSTR(expdest);
         ifsfirst.next = NULL;
         ifslastp = NULL;
+        TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
         argstr(arg->narg.text, flag,
                         /* var_str_list: */ arglist ? arglist->list : NULL);
         p = _STPUTC('\0', expdest);
@@ -7257,6 +7256,7 @@ expandarg(union node *arg, struct arglist *arglist, int flag)
                 return;                 /* here document expanded */
         }
         p = grabstackstr(p);
+        TRACE(("expandarg: p:'%s'\n", p));
         exparg.lastp = &exparg.list;
         /*
          * TODO - EXP_REDIR
@@ -7267,8 +7267,10 @@ expandarg(union node *arg, struct arglist *arglist, int flag)
                 exparg.lastp = &exparg.list;
                 expandmeta(exparg.list /*, flag*/);
         } else {
-                if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
+                if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
                         rmescapes(p, 0);
+                        TRACE(("expandarg: rmescapes:'%s'\n", p));
+                }
                 sp = stzalloc(sizeof(*sp));
                 sp->text = p;
                 *exparg.lastp = sp;
@@ -8665,6 +8667,7 @@ expredir(union node *n)
                 case NCLOBBER:
                 case NAPPEND:
                         expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
+                        TRACE(("expredir expanded to '%s'\n", fn.list->text));
 #if ENABLE_ASH_BASH_COMPAT
  store_expfname:
 #endif
diff --git a/shell/ash_test/ash-redir/redirA.right b/shell/ash_test/ash-redir/redirA.right
new file mode 100644
index 000000000..31406e336
--- /dev/null
+++ b/shell/ash_test/ash-redir/redirA.right
@@ -0,0 +1,2 @@
+tmp11
+tmp11
diff --git a/shell/ash_test/ash-redir/redirA.tests b/shell/ash_test/ash-redir/redirA.tests
new file mode 100755
index 000000000..56833f938
--- /dev/null
+++ b/shell/ash_test/ash-redir/redirA.tests
@@ -0,0 +1,11 @@
+x="tmp11:tmp22"
+
+# Bug was incorrectly expanding variables in >redir
+echo "${x%:*}" >"${x%:*}"
+echo tmp1*
+rm tmp1*
+
+# Also try unquoted
+echo "${x%:*}" >${x%:*}
+echo tmp1*
+rm tmp1*