feat: add possibility to specify a log directory

Close: #1

src/log_proxy.c

@@ -188,7 +188,7 @@ int main(int argc, char *argv[])
     setlocale(LC_ALL, "");
     context = g_option_context_new("LOGFILE  - log proxy");
     g_option_context_add_main_entries(context, entries, NULL);
-    gchar *description = "Optional environment variables to override defaults: \n    LOGPROXY_ROTATION_SIZE\n    LOGPROXY_ROTATION_TIME\n    LOGPROXY_ROTATION_SUFFIX\n    LOGPROXY_ROTATED_FILES\n\nExample for rotation-size option:\n- If log_proxy is run with the option --rotation-size on the command line, rotation-size will take the provided value\n- If the option --rotation-size is not provided on command line :\n  - If the environment variable LOGPROXY_ROTATION_SIZE is set, rotation-size will take this value\n  - If the environment variable LOGPROXY_ROTATION_SIZE is not set, rotation-size will take the default value 104857600\n";
+    gchar *description = "Optional environment variables to override defaults: \n    LOGPROXY_ROTATION_SIZE\n    LOGPROXY_ROTATION_TIME\n    LOGPROXY_ROTATION_SUFFIX\n    LOGPROXY_LOG_DIRECTORY\n    LOGPROXY_ROTATED_FILES\n\nExample for rotation-size option:\n- If log_proxy is run with the option --rotation-size on the command line, rotation-size will take the provided value\n- If the option --rotation-size is not provided on command line :\n  - If the environment variable LOGPROXY_ROTATION_SIZE is set, rotation-size will take this value\n  - If the environment variable LOGPROXY_ROTATION_SIZE is not set, rotation-size will take the default value 104857600\n";
     g_option_context_set_description(context, description);
     if (!g_option_context_parse(context, &argc, &argv, NULL)) {
         g_print(g_option_context_get_help(context, TRUE, NULL));
@@ -201,8 +201,17 @@ int main(int argc, char *argv[])
     atexit(exit_handler);
     signal(SIGTERM, signal_handler);
     signal(SIGINT, signal_handler);
-    log_file = g_strdup(argv[1]);
     set_default_values_from_env();
+    log_file = compute_file_path(log_directory, argv[1]);
+    // Create log directory if not existing
+    gchar *log_dir = g_path_get_dirname(log_file);
+    if ( ! g_file_test(log_dir, G_FILE_TEST_IS_DIR) ) {
+        if ( g_mkdir_with_parents(log_dir, 0755) == -1 ) {
+            g_critical("Can't create directory %s => exit", log_dir);
+            return 1;
+        }
+    }
+    g_free(log_dir);
     GIOChannel *in = NULL;
     if (fifo == NULL) {
         // We read from stdin

src/options.h

@@ -4,11 +4,14 @@
 #include <glib.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
+#include <limits.h>
 
 static gchar *log_file = NULL;
 static glong rotation_size = -1;
 static glong rotation_time = -1;
 static gchar *rotation_suffix = NULL;
+static gchar *log_directory = NULL;
 static gint rotated_files = -1;
 static gboolean rm_fifo_at_exit = FALSE;
 static gchar *fifo = NULL;
@@ -57,12 +60,23 @@ void set_default_values_from_env()
             rotated_files = 5;
         }
     }
+
+    if ( log_directory ==  NULL ) {
+        env_val = g_getenv("LOGPROXY_LOG_DIRECTORY");
+        if ( env_val != NULL ) {
+            log_directory = (gchar *)env_val;
+        }
+        else {
+            log_directory = g_strdup(g_get_current_dir());
+        }
+    }
 }
 
 static GOptionEntry entries[] = {
     { "rotation-size", 's', 0, G_OPTION_ARG_INT64, &rotation_size, "maximum size (in bytes) for a log file before rotation (0 => no maximum, default: content of environment variable LOGPROXY_ROTATION_SIZE or 104857600 (100MB))", NULL },
     { "rotation-time", 't', 0, G_OPTION_ARG_INT64, &rotation_time, "maximum lifetime (in seconds) for a log file before rotation (0 => no maximum, default: content of environment variable LOGPROXY_ROTATION_TIME or 86400 (24H))", NULL },
-    { "rotation-suffix", 'S', 0, G_OPTION_ARG_STRING, &rotation_suffix, "strftime based suffix to append to rotated log files (default: content of environment variable LOGPROXY_ROTATION_SUFFIX or .%%Y%%m%%d%%H%%M%%S", NULL },
+    { "rotation-suffix", 'S', 0, G_OPTION_ARG_STRING, &rotation_suffix, "strftime based suffix to append to rotated log files (default: content of environment variable LOGPROXY_ROTATION_SUFFIX or .%%Y%%m%%d%%H%%M%%S)", NULL },
+    { "log-directory", 'd', 0, G_OPTION_ARG_STRING, &log_directory, "directory to store log files (default: content of environment variable LOGPROXY_LOG_DIRECTORY or current directory), directory is created if missing", NULL },
     { "rotated-files", 'n', 0, G_OPTION_ARG_INT, &rotated_files, "maximum number of rotated files to keep including main one (0 => no cleaning, default: content of environment variable LOGPROXY_ROTATED_FILES or 5)", NULL },
     { "use-locks", 'm', 0, G_OPTION_ARG_NONE, &use_locks, "use locks to append to main log file (useful if several process writes to the same file)", NULL },
     { "fifo", 'f', 0, G_OPTION_ARG_STRING, &fifo, "if set, read lines on this fifo instead of stdin", NULL },

src/util.c

@@ -3,6 +3,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <limits.h>
 #include "util.h"
 
 static GRand *__rand = NULL;
@@ -112,6 +113,28 @@ gchar *compute_strftime_suffix(const gchar *str, const gchar *strftime_suffix) {
     return g_strdup_printf("%s%s", str, outstr);
 }
 
+/**
+ * Compute absolute file path from directory path and file name
+ *
+ * @param directory absolute or relative directory path
+ * @param file_name file name (absolute or relative, if absolute directory is ignored)
+ * @return newly allocated string (free it with g_free) with absolute path to the file
+ */
+gchar *compute_file_path(const gchar *directory, const gchar *file_name) {
+    if ( file_name[0] == '/' ) {
+        return g_strdup_printf("%s", file_name);
+    }
+    else {
+        if ( directory[0] == '/' ) {
+            return g_strdup_printf("%s/%s", directory, file_name);
+        }
+        else {
+            return g_strdup_printf("%s/%s/%s", g_get_current_dir(), directory,
+                                   file_name);
+        }
+    }
+}
+
 /**
  * Create an empty file if it does not exist
  *

src/util.h

@@ -10,5 +10,6 @@ gchar *get_unique_hexa_identifier();
 glong get_file_inode(const gchar *file_path);
 glong get_fd_inode(int fd);
 gboolean create_empty(const gchar *file_path);
+gchar *compute_file_path(const gchar *directory, const gchar *file_name);
 
 #endif /* UTIL_H_ */