Add --clearenv option

This allows environment variables to be set when running bwrap itself
(perhaps a custom LD_LIBRARY_PATH), but cleared for the command that
runs in the container, without having to enumerate all the variables.

Because PWD is set later, as a side-effect of changing directory, this
actually clears everything except PWD.

A portable program would check for clearenv() (and if not found, fall
back to using environ = NULL), but bubblewrap is Linux-specific, and
Linux C libraries (at least glibc and musl) do have clearenv().

Signed-off-by: Simon McVittie <smcv@collabora.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/utils.h b/utils.h
index 8c4db61..b107171 100644
--- a/utils.h
+++ b/utils.h
@@ -62,6 +62,7 @@ void *xrealloc (void  *ptr,
                 size_t size);
 char *xstrdup (const char *str);
 void  strfreev (char **str_array);
+void  xclearenv (void);
 void  xsetenv (const char *name,
                const char *value,
                int         overwrite);