From 3c6f6263bb2d87dc863c24a4edc59c2c959270b0 Mon Sep 17 00:00:00 2001 From: Amit Margalit Date: Mon, 8 Jul 2013 12:10:31 -0400 Subject: [PATCH] Allow environment variable LTTNG_HOME to override HOME Patch functionality - If LTTNG_HOME environment variable exists, it is used instead of HOME. Reason for patch - We are trying to deploy LTTng on a system where $HOME is on a filesystem mounted read-only, but cannot afford to run lttng as a different user and cannot move the home directories of users to writeable locations. Signed-off-by: Mathieu Desnoyers --- liblttng-ust/lttng-ust-comm.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/liblttng-ust/lttng-ust-comm.c b/liblttng-ust/lttng-ust-comm.c index 60beef8f..475110cf 100644 --- a/liblttng-ust/lttng-ust-comm.c +++ b/liblttng-ust/lttng-ust-comm.c @@ -188,6 +188,22 @@ extern void lttng_ring_buffer_client_discard_exit(void); extern void lttng_ring_buffer_client_discard_rt_exit(void); extern void lttng_ring_buffer_metadata_client_exit(void); +/* + * Returns the HOME directory path. Caller MUST NOT free(3) the returned + * pointer. + */ +static +const char *get_lttng_home_dir(void) +{ + const char *val; + + val = (const char *) getenv("LTTNG_HOME"); + if (val != NULL) { + return val; + } + return (const char *) getenv("HOME"); +} + /* * Force a read (imply TLS fixup for dlopen) of TLS variables. */ @@ -232,7 +248,7 @@ int setup_local_apps(void) assert(local_apps.allowed == 0); return 0; } - home_dir = (const char *) getenv("HOME"); + home_dir = get_lttng_home_dir(); if (!home_dir) { WARN("HOME environment variable not set. Disabling LTTng-UST per-user tracing."); assert(local_apps.allowed == 0); -- 2.34.1