pids: re-enabled tests on Alpine Linux (#4405)

* [WIP] pids: re-enabled tests on Alpine Linux

* trying to compile a simple-faked sleep command

* make FreeBSD happy

* remove the block testing for Alpine Linux

* simpler version of sleeper.c

* simpler version of sleeper.c, part II

* Update tests/integration/targets/pids/tasks/main.yml

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update tests/integration/targets/pids/tasks/main.yml

Co-authored-by: Felix Fontein <felix@fontein.de>

* added license to sleeper.c file

Co-authored-by: Felix Fontein <felix@fontein.de>

tests/integration/targets/pids/files/sleeper.c

@@ -0,0 +1,12 @@
+/*
+ * (c) 2022, Alexei Znamensky <russoz@gmail.com>
+ * GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+
+int main(int argc, char **argv) {
+    int delay = atoi(argv[1]);
+    sleep(delay);
+}

tests/integration/targets/pids/tasks/main.yml

@@ -7,10 +7,6 @@
 # Copyright: (c) 2019, Saranya Sridharan
 # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
-- when:
-    - not (ansible_os_family == 'Alpine')  # TODO
-  block:
-
 - name: Attempt installation of latest 'psutil' version
   pip:
     name: psutil
@@ -37,35 +33,32 @@
   set_fact:
     random_name: some-random-long-name-{{ 99999999 | random }}
 
-  - name: "finding the 'sleep' binary"
+- name: Copy the fake 'sleep' source code
-    command: which sleep
+  copy:
-    register: find_sleep
+    src: sleeper.c
+    dest: "{{ remote_tmp_dir }}/sleeper.c"
+    mode: 0644
 
-  - name: "Copying 'sleep' binary"
+- name: Compile fake 'sleep' binary
-    command: cp {{ find_sleep.stdout }} {{ remote_tmp_dir }}/{{ random_name }}
+  command: cc {{ remote_tmp_dir }}/sleeper.c -o {{ remote_tmp_dir }}/{{ random_name }}
-    # The following does not work on macOS 11.1 (it uses shutil.copystat, and that will die with a PermissionError):
-    # copy:
-    #   src: "{{ find_sleep.stdout }}"
-    #   dest: "{{ remote_tmp_dir }}/{{ random_name }}"
-    #   mode: "0777"
-    #   remote_src: true
 
 - name: Copy helper script
   copy:
     src: obtainpid.sh
     dest: "{{ remote_tmp_dir }}/obtainpid.sh"
+    mode: 0755
 
-  - name: "Running the copy of 'sleep' binary"
+- name: "Run the fake 'sleep' binary"
   command: "sh {{ remote_tmp_dir }}/obtainpid.sh '{{ remote_tmp_dir }}/{{ random_name }}' '{{ remote_tmp_dir }}/obtainpid.txt'"
 
   async: 100
   poll: 0
 
-  - name: "Wait for one second to make sure that the sleep copy has actually been started"
+- name: "Wait for one second to make sure that the fake 'sleep' binary has actually been started"
   pause:
     seconds: 1
 
-  - name: "Checking the process IDs (PIDs) of sleep binary"
+- name: "Checking the process IDs (PIDs) of fake 'sleep' binary"
   pids:
     name: "{{ random_name }}"
   register: pids