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List: busybox-cvs
Subject: [git commit] ash: fix interactive "command eval STRING" exiting on errors.
From: Denys Vlasenko <vda.linux () googlemail ! com>
Date: 2016-10-28 13:43:50
Message-ID: 20161028135641.208DC81941 () busybox ! osuosl ! org
[Download RAW message or body]
commit: https://git.busybox.net/busybox/commit/?id=d81e9f5093b222369d510d0b1c0587a411e4c83e
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master
This bug is also present in current dash
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
shell/ash.c | 25 ++++++++++++++++++++++++-
shell/ash_test/ash-vars/readonly1.right | 2 ++
shell/ash_test/ash-vars/readonly1.tests | 7 +++++++
3 files changed, 33 insertions(+), 1 deletion(-)
diff --git a/shell/ash.c b/shell/ash.c
index 1ef02b8..fe11245 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -2180,6 +2180,7 @@ setvareq(char *s, int flags)
if (flags & VNOSAVE)
free(s);
n = vp->var_text;
+ exitstatus = 1;
ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
}
@@ -9599,7 +9600,7 @@ evalcommand(union node *cmd, int flags)
if (evalbltin(cmdentry.u.cmd, argc, argv, flags)) {
if (exception_type == EXERROR && spclbltin <= 0) {
FORCE_INT_ON;
- break;
+ goto readstatus;
}
raise:
longjmp(exception_handler->loc, 1);
@@ -12280,6 +12281,10 @@ expandstr(const char *ps)
static int
evalstring(char *s, int flags)
{
+ struct jmploc *volatile savehandler = exception_handler;
+ struct jmploc jmploc;
+ int ex;
+
union node *n;
struct stackmark smark;
int status;
@@ -12289,6 +12294,19 @@ evalstring(char *s, int flags)
setstackmark(&smark);
status = 0;
+ /* On exception inside execution loop, we must popfile().
+ * Try interactively:
+ * readonly a=a
+ * command eval "a=b" # throws "is read only" error
+ * "command BLTIN" is not supposed to abort (even in non-interactive use).
+ * But if we skip popfile(), we hit EOF in eval's string, and exit.
+ */
+ savehandler = exception_handler;
+ exception_handler = &jmploc;
+ ex = setjmp(jmploc.loc);
+ if (ex)
+ goto out;
+
while ((n = parsecmd(0)) != NODE_EOF) {
int i;
@@ -12299,10 +12317,15 @@ evalstring(char *s, int flags)
if (evalskip)
break;
}
+ out:
popstackmark(&smark);
popfile();
stunalloc(s);
+ exception_handler = savehandler;
+ if (ex)
+ longjmp(exception_handler->loc, ex);
+
return status;
}
diff --git a/shell/ash_test/ash-vars/readonly1.right b/shell/ash_test/ash-vars/readonly1.right
new file mode 100644
index 0000000..2b363e3
--- /dev/null
+++ b/shell/ash_test/ash-vars/readonly1.right
@@ -0,0 +1,2 @@
+One:1
+One:1
diff --git a/shell/ash_test/ash-vars/readonly1.tests b/shell/ash_test/ash-vars/readonly1.tests
new file mode 100755
index 0000000..81b461f
--- /dev/null
+++ b/shell/ash_test/ash-vars/readonly1.tests
@@ -0,0 +1,7 @@
+readonly bla=123
+# Bare "eval bla=123" should abort ("eval" is a special builtin):
+(eval bla=123 2>/dev/null; echo BUG)
+echo One:$?
+# "command BLTIN" disables "special-ness", should not abort:
+command eval bla=123 2>/dev/null
+echo One:$?
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