X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Fpath-util.c;h=0b50ea646aa984a3a1a64b15946f438ac17527e1;hb=66e35261ef51119189486e9a31e7b97e8e18e255;hp=2bdbd22dc71becce8484dec92fb81dc8326e68ef;hpb=cde9cb343ae101660dd36992cae730b63c7cd617;p=elogind.git

diff --git a/src/shared/path-util.c b/src/shared/path-util.c
index 2bdbd22dc..0b50ea646 100644
--- a/src/shared/path-util.c
+++ b/src/shared/path-util.c
@@ -35,6 +35,7 @@
 #include "log.h"
 #include "strv.h"
 #include "path-util.h"
+#include "missing.h"
 
 bool path_is_absolute(const char *p) {
         return p[0] == '/';
@@ -134,7 +135,8 @@ char *path_make_absolute_cwd(const char *p) {
         if (path_is_absolute(p))
                 return strdup(p);
 
-        if (!(cwd = get_current_dir_name()))
+        cwd = get_current_dir_name();
+        if (!cwd)
                 return NULL;
 
         r = path_make_absolute(p, cwd);
@@ -180,6 +182,7 @@ char **path_strv_canonicalize(char **l) {
 
                 t = path_make_absolute_cwd(*s);
                 free(*s);
+                *s = NULL;
 
                 if (!t) {
                         enomem = true;
@@ -188,14 +191,18 @@ char **path_strv_canonicalize(char **l) {
 
                 errno = 0;
                 u = canonicalize_file_name(t);
-                free(t);
-
                 if (!u) {
-                        if (errno == ENOMEM || !errno)
-                                enomem = true;
-
-                        continue;
-                }
+                        if (errno == ENOENT)
+                                u = t;
+                        else {
+                                free(t);
+                                if (errno == ENOMEM || !errno)
+                                        enomem = true;
+
+                                continue;
+                        }
+                } else
+                        free(t);
 
                 l[k++] = u;
         }
@@ -208,24 +215,14 @@ char **path_strv_canonicalize(char **l) {
         return l;
 }
 
-char **path_strv_remove_empty(char **l) {
-        char **f, **t;
+char **path_strv_canonicalize_uniq(char **l) {
+        if (strv_isempty(l))
+                return l;
 
-        if (!l)
+        if (!path_strv_canonicalize(l))
                 return NULL;
 
-        for (f = t = l; *f; f++) {
-
-                if (dir_is_empty(*f) > 0) {
-                        free(*f);
-                        continue;
-                }
-
-                *(t++) = *f;
-        }
-
-        *t = NULL;
-        return l;
+        return strv_uniq(l);
 }
 
 char *path_kill_slashes(char *path) {
@@ -263,12 +260,12 @@ char *path_kill_slashes(char *path) {
         return path;
 }
 
-bool path_startswith(const char *path, const char *prefix) {
+char* path_startswith(const char *path, const char *prefix) {
         assert(path);
         assert(prefix);
 
         if ((path[0] == '/') != (prefix[0] == '/'))
-                return false;
+                return NULL;
 
         for (;;) {
                 size_t a, b;
@@ -277,19 +274,19 @@ bool path_startswith(const char *path, const char *prefix) {
                 prefix += strspn(prefix, "/");
 
                 if (*prefix == 0)
-                        return true;
+                        return (char*) path;
 
                 if (*path == 0)
-                        return false;
+                        return NULL;
 
                 a = strcspn(path, "/");
                 b = strcspn(prefix, "/");
 
                 if (a != b)
-                        return false;
+                        return NULL;
 
                 if (memcmp(path, prefix, a) != 0)
-                        return false;
+                        return NULL;
 
                 path += a;
                 prefix += b;
@@ -334,6 +331,7 @@ int path_is_mount_point(const char *t, bool allow_symlink) {
         int r;
         struct file_handle *h;
         int mount_id, mount_id_parent;
+        struct stat a, b;
 
         /* We are not actually interested in the file handles, but
          * name_to_handle_at() also passes us the mount ID, hence use
@@ -347,6 +345,12 @@ int path_is_mount_point(const char *t, bool allow_symlink) {
 
         r = name_to_handle_at(AT_FDCWD, t, h, &mount_id, allow_symlink ? AT_SYMLINK_FOLLOW : 0);
         if (r < 0) {
+                if (errno == ENOSYS || errno == ENOTSUP)
+                        /* This kernel or file system does not support
+                         * name_to_handle_at(), hence fallback to the
+                         * traditional stat() logic */
+                        goto fallback;
+
                 if (errno == ENOENT)
                         return 0;
 
@@ -361,11 +365,42 @@ int path_is_mount_point(const char *t, bool allow_symlink) {
         r = name_to_handle_at(AT_FDCWD, parent, h, &mount_id_parent, 0);
         free(parent);
 
-        if (r < 0)
-                return -errno;
+        if (r < 0) {
+                /* The parent can't do name_to_handle_at() but the
+                 * directory we are interested in can? If so, it must
+                 * be a mount point */
+                if (errno == ENOTSUP)
+                        return 1;
 
+                return -errno;
+        }
 
         return mount_id != mount_id_parent;
+
+fallback:
+        if (allow_symlink)
+                r = stat(t, &a);
+        else
+                r = lstat(t, &a);
+
+        if (r < 0) {
+                if (errno == ENOENT)
+                        return 0;
+
+                return -errno;
+        }
+
+        r = path_get_parent(t, &parent);
+        if (r < 0)
+                return r;
+
+        r = lstat(parent, &b);
+        free(parent);
+
+        if (r < 0)
+                return -errno;
+
+        return a.st_dev != b.st_dev;
 }
 
 int path_is_read_only_fs(const char *path) {