There is a very useful feature in Bash where you can redirect the trace
enabled by `set -x` to a file descriptor *different* than 2. This comes
in particularly handy when validating the error output of commands, say,
in Git's test suite, while tracing at the same time.
It is such a useful feature, and very easily implemented.
Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
shell/ash.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/shell/ash.c b/shell/ash.c
index 8c9f4adc6..1d1596fec 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -182,6 +182,8 @@
#define IF_BASH_PATTERN_SUBST IF_ASH_BASH_COMPAT
#define BASH_SUBSTR ENABLE_ASH_BASH_COMPAT
#define IF_BASH_SUBSTR IF_ASH_BASH_COMPAT
+#define BASH_XTRACEFD ENABLE_ASH_BASH_COMPAT
+#define IF_BASH_XTRACEFD IF_ASH_BASH_COMPAT
/* [[ EXPR ]] */
#define BASH_TEST2 (ENABLE_ASH_BASH_COMPAT * ENABLE_ASH_TEST)
#define BASH_SOURCE ENABLE_ASH_BASH_COMPAT
@@ -9740,6 +9742,7 @@ evalcommand(union node *cmd, int flags)
int status;
char **nargv;
smallint cmd_is_exec;
+ IF_BASH_XTRACEFD(const char *xtracefd;)
/* First expand the arguments. */
TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
@@ -9791,6 +9794,10 @@ evalcommand(union node *cmd, int flags)
expredir(cmd->ncmd.redirect);
redir_stop = pushredir(cmd->ncmd.redirect);
+#ifdef BASH_XTRACEFD
+ xtracefd = lookupvar("BASH_XTRACEFD");
+ if (!xtracefd || (preverrout_fd = atoi(xtracefd)) < 0)
+#endif
preverrout_fd = 2;
status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
base-commit: 4dc86699b57ff35c287ca396d562ec206776694a
--
2.13.3.windows.1.1055.g9b9ea5f2d78
Published-As:
https://github.com/dscho/busybox-w32/releases/tag/busybox-xtracefd-v1
Fetch-It-Via: git fetch https://github.com/dscho/busybox-w32 busybox-xtracefd-v1
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