Fix failed tests on Linux Alpine and add a CI job. (#8532)

* Remove linux/version.h dependency.

This introduces unnecessary dependencies, and generally not a good idea
as the platform we build on may be different than the platform we run
on.

To determine if sync_file_range exists we can simply rely on header file
hints.

* Fix setproctitle() on libmusl.

The previous ifdef checks were a bit too strict for no apparent
reason.

* Fix tests failure on Linux with no backtrace.

* Add alpine daily CI job.

.github/workflows/daily.yml

@@ -221,3 +221,23 @@ jobs:
           MAKE=gmake ./runtest-moduleapi --verbose &&
           ./runtest-sentinel &&
           ./runtest-cluster
+
+  test-alpine:
+    runs-on: ubuntu-latest
+    container: alpine:latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: make
+      run: |
+          apk add build-base
+          make REDIS_CFLAGS='-Werror'
+    - name: test
+      run: |
+        apk add tcl procps
+        ./runtest --accurate --verbose --dump-logs
+    - name: module api test
+      run: ./runtest-moduleapi --verbose
+    - name: sentinel tests
+      run: ./runtest-sentinel
+    - name: cluster tests
+      run: ./runtest-cluster

src/config.h

@@ -35,7 +35,6 @@
 #endif
 
 #ifdef __linux__
-#include <linux/version.h>
 #include <features.h>
 #endif
 
@@ -114,19 +113,7 @@
 
 /* Define rdb_fsync_range to sync_file_range() on Linux, otherwise we use
  * the plain fsync() call. */
-#ifdef __linux__
-#if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
-#if (LINUX_VERSION_CODE >= 0x020611 && __GLIBC_PREREQ(2, 6))
-#define HAVE_SYNC_FILE_RANGE 1
-#endif
-#else
-#if (LINUX_VERSION_CODE >= 0x020611)
-#define HAVE_SYNC_FILE_RANGE 1
-#endif
-#endif
-#endif
-
-#ifdef HAVE_SYNC_FILE_RANGE
+#if (defined(__linux__) && defined(SYNC_FILE_RANGE_WAIT_BEFORE))
 #define rdb_fsync_range(fd,off,size) sync_file_range(fd,off,size,SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE)
 #else
 #define rdb_fsync_range(fd,off,size) fsync(fd)
@@ -143,7 +130,7 @@
 #define ESOCKTNOSUPPORT 0
 #endif
 
-#if ((defined __linux && defined(__GLIBC__)) || defined __APPLE__)
+#if (defined __linux || defined __APPLE__)
 #define USE_SETPROCTITLE
 #define INIT_SETPROCTITLE_REPLACEMENT
 void spt_init(int argc, char *argv[]);

src/fmacros.h

@@ -60,7 +60,6 @@
 
 #ifdef __linux__
 /* features.h uses the defines above to set feature specific defines.  */
-#include <linux/version.h>
 #include <features.h>
 #endif
 

src/setproctitle.c

@@ -232,7 +232,7 @@ void spt_init(int argc, char *argv[]) {
 	if (!(SPT.arg0 = strdup(argv[0])))
 		goto syerr;
 
-#if __GLIBC__
+#if __linux__
 	if (!(tmp = strdup(program_invocation_name)))
 		goto syerr;
 

tests/integration/logging.tcl

@@ -1,6 +1,18 @@
 set system_name [string tolower [exec uname -s]]
+set system_supported 0
 
-if {$system_name eq {linux} || $system_name eq {darwin}} {
+# We only support darwin or Linux with glibc
+if {$system_name eq {darwin}} {
+    set system_supported 1
+} elseif {$system_name eq {linux}} {
+    # Avoid the test on libmusl, which does not support backtrace
+    set ldd [exec ldd src/redis-server]
+    if {![string match {*libc.musl*} $ldd]} {
+        set system_supported 1
+    }
+}
+
+if {$system_supported} {
     set server_path [tmpdir server.log]
     start_server [list overrides [list dir $server_path]] {
         test "Server is able to generate a stack trace on selected systems" {