run: allow non-absolute paths as command

2 files changed, 56 insertions, 0 deletions

diff --git a/src/shared/path-util.c b/src/shared/path-util.c
index 6888135778..8e108db531 100644
--- a/src/shared/path-util.c
+++ b/src/shared/path-util.c
@@ -425,3 +425,51 @@ int path_is_os_tree(const char *path) {
 
         return r < 0 ? 0 : 1;
 }
+
+int find_binary(const char *name, char **filename) {
+        assert(name);
+        if (strchr(name, '/')) {
+                char *p;
+
+                if (path_is_absolute(name))
+                        p = strdup(name);
+                else
+                        p = path_make_absolute_cwd(name);
+                if (!p)
+                        return -ENOMEM;
+
+                *filename = p;
+                return 0;
+        } else {
+                const char *path;
+                char *state, *w;
+                size_t l;
+
+                /**
+                 * Plain getenv, not secure_getenv, because we want
+                 * to actually allow the user to pick the binary.
+                 */
+                path = getenv("PATH");
+                if (!path)
+                        path = DEFAULT_PATH;
+
+                FOREACH_WORD_SEPARATOR(w, l, path, ":", state) {
+                        char *p;
+
+                        if (asprintf(&p, "%.*s/%s", l, w, name) < 0)
+                                return -ENOMEM;
+
+                        if (access(p, X_OK) < 0) {
+                                free(p);
+                                continue;
+                        }
+
+                        path_kill_slashes(p);
+                        *filename = p;
+
+                        return 0;
+                }
+
+                return -ENOENT;
+        }
+}
diff --git a/src/shared/path-util.h b/src/shared/path-util.h
index d187743769..9452931586 100644
--- a/src/shared/path-util.h
+++ b/src/shared/path-util.h
@@ -25,6 +25,12 @@
 
 #include "macro.h"
 
+#ifdef HAVE_SPLIT_USR
+#  define DEFAULT_PATH "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
+#else
+#  define DEFAULT_PATH "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin"
+#endif
+
 bool is_path(const char *p) _pure_;
 char** path_split_and_make_absolute(const char *p);
 char* path_get_file_name(const char *p) _pure_;
@@ -43,3 +49,5 @@ char** path_strv_canonicalize_uniq(char **l);
 int path_is_mount_point(const char *path, bool allow_symlink);
 int path_is_read_only_fs(const char *path);
 int path_is_os_tree(const char *path);
+
+int find_binary(const char *name, char **filename);