diff --git a/minui/resources.c b/minui/resources.c
index 72f39fb..c0a9cca 100644
--- a/minui/resources.c
+++ b/minui/resources.c
@@ -93,9 +93,13 @@
     png_set_sig_bytes(png_ptr, sizeof(header));
     png_read_info(png_ptr, info_ptr);
 
-    int color_type = info_ptr->color_type;
-    int bit_depth = info_ptr->bit_depth;
-    int channels = info_ptr->channels;
+    int color_type, bit_depth;
+    size_t width, height;
+    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
+            &color_type, NULL, NULL, NULL);
+
+    int channels = png_get_channels(png_ptr, info_ptr);
+
     if (!(bit_depth == 8 &&
           ((channels == 3 && color_type == PNG_COLOR_TYPE_RGB) ||
            (channels == 4 && color_type == PNG_COLOR_TYPE_RGBA) ||
@@ -105,8 +109,6 @@
         goto exit;
     }
 
-    size_t width = info_ptr->width;
-    size_t height = info_ptr->height;
     size_t stride = (color_type == PNG_COLOR_TYPE_GRAY ? 1 : 4) * width;
     size_t pixelSize = stride * height;
 
@@ -246,13 +248,11 @@
     png_set_sig_bytes(png_ptr, sizeof(header));
     png_read_info(png_ptr, info_ptr);
 
-    size_t width = info_ptr->width;
-    size_t height = info_ptr->height;
-    size_t stride = 4 * width;
-
-    int color_type = info_ptr->color_type;
-    int bit_depth = info_ptr->bit_depth;
-    int channels = info_ptr->channels;
+    int color_type, bit_depth;
+    size_t width, height;
+    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
+            &color_type, NULL, NULL, NULL);
+    int channels = png_get_channels(png_ptr, info_ptr);
 
     if (!(bit_depth == 8 &&
           (channels == 1 && color_type == PNG_COLOR_TYPE_GRAY))) {
diff --git a/minzip/DirUtil.c b/minzip/DirUtil.c
index 8dd5da1..fe2c880 100644
--- a/minzip/DirUtil.c
+++ b/minzip/DirUtil.c
@@ -234,61 +234,3 @@
     /* delete target directory */
     return rmdir(path);
 }
-
-int
-dirSetHierarchyPermissions(const char *path,
-        int uid, int gid, int dirMode, int fileMode)
-{
-    struct stat st;
-    if (lstat(path, &st)) {
-        return -1;
-    }
-
-    /* ignore symlinks */
-    if (S_ISLNK(st.st_mode)) {
-        return 0;
-    }
-
-    /* directories and files get different permissions */
-    if (chown(path, uid, gid) ||
-        chmod(path, S_ISDIR(st.st_mode) ? dirMode : fileMode)) {
-        return -1;
-    }
-
-    /* recurse over directory components */
-    if (S_ISDIR(st.st_mode)) {
-        DIR *dir = opendir(path);
-        if (dir == NULL) {
-            return -1;
-        }
-
-        errno = 0;
-        const struct dirent *de;
-        while (errno == 0 && (de = readdir(dir)) != NULL) {
-            if (!strcmp(de->d_name, "..") || !strcmp(de->d_name, ".")) {
-                continue;
-            }
-
-            char dn[PATH_MAX];
-            snprintf(dn, sizeof(dn), "%s/%s", path, de->d_name);
-            if (!dirSetHierarchyPermissions(dn, uid, gid, dirMode, fileMode)) {
-                errno = 0;
-            } else if (errno == 0) {
-                errno = -1;
-            }
-        }
-
-        if (errno != 0) {
-            int save = errno;
-            closedir(dir);
-            errno = save;
-            return -1;
-        }
-
-        if (closedir(dir)) {
-            return -1;
-        }
-    }
-
-    return 0;
-}
diff --git a/minzip/DirUtil.h b/minzip/DirUtil.h
index a5cfa76..85a0012 100644
--- a/minzip/DirUtil.h
+++ b/minzip/DirUtil.h
@@ -48,14 +48,6 @@
  */
 int dirUnlinkHierarchy(const char *path);
 
-/* chown -R <uid>:<gid> <path>
- * chmod -R <mode> <path>
- *
- * Sets directories to <dirMode> and files to <fileMode>.  Skips symlinks.
- */
-int dirSetHierarchyPermissions(const char *path,
-         int uid, int gid, int dirMode, int fileMode);
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/updater/install.c b/updater/install.c
index 0a85945..061aa7b 100644
--- a/updater/install.c
+++ b/updater/install.c
@@ -524,88 +524,6 @@
     return StringValue(strdup(""));
 }
 
-
-Value* SetPermFn(const char* name, State* state, int argc, Expr* argv[]) {
-    char* result = NULL;
-    bool recursive = (strcmp(name, "set_perm_recursive") == 0);
-
-    int min_args = 4 + (recursive ? 1 : 0);
-    if (argc < min_args) {
-        return ErrorAbort(state, "%s() expects %d+ args, got %d",
-                          name, min_args, argc);
-    }
-
-    char** args = ReadVarArgs(state, argc, argv);
-    if (args == NULL) return NULL;
-
-    char* end;
-    int i;
-    int bad = 0;
-
-    int uid = strtoul(args[0], &end, 0);
-    if (*end != '\0' || args[0][0] == 0) {
-        ErrorAbort(state, "%s: \"%s\" not a valid uid", name, args[0]);
-        goto done;
-    }
-
-    int gid = strtoul(args[1], &end, 0);
-    if (*end != '\0' || args[1][0] == 0) {
-        ErrorAbort(state, "%s: \"%s\" not a valid gid", name, args[1]);
-        goto done;
-    }
-
-    if (recursive) {
-        int dir_mode = strtoul(args[2], &end, 0);
-        if (*end != '\0' || args[2][0] == 0) {
-            ErrorAbort(state, "%s: \"%s\" not a valid dirmode", name, args[2]);
-            goto done;
-        }
-
-        int file_mode = strtoul(args[3], &end, 0);
-        if (*end != '\0' || args[3][0] == 0) {
-            ErrorAbort(state, "%s: \"%s\" not a valid filemode",
-                       name, args[3]);
-            goto done;
-        }
-
-        for (i = 4; i < argc; ++i) {
-            dirSetHierarchyPermissions(args[i], uid, gid, dir_mode, file_mode);
-        }
-    } else {
-        int mode = strtoul(args[2], &end, 0);
-        if (*end != '\0' || args[2][0] == 0) {
-            ErrorAbort(state, "%s: \"%s\" not a valid mode", name, args[2]);
-            goto done;
-        }
-
-        for (i = 3; i < argc; ++i) {
-            if (chown(args[i], uid, gid) < 0) {
-                printf("%s: chown of %s to %d %d failed: %s\n",
-                        name, args[i], uid, gid, strerror(errno));
-                ++bad;
-            }
-            if (chmod(args[i], mode) < 0) {
-                printf("%s: chmod of %s to %o failed: %s\n",
-                        name, args[i], mode, strerror(errno));
-                ++bad;
-            }
-        }
-    }
-    result = strdup("");
-
-done:
-    for (i = 0; i < argc; ++i) {
-        free(args[i]);
-    }
-    free(args);
-
-    if (bad) {
-        free(result);
-        return ErrorAbort(state, "%s: some changes failed", name);
-    }
-    return StringValue(result);
-}
-
 struct perm_parsed_args {
     bool has_uid;
     uid_t uid;
@@ -1398,11 +1316,6 @@
     RegisterFunction("package_extract_file", PackageExtractFileFn);
     RegisterFunction("symlink", SymlinkFn);
 
-    // Maybe, at some future point, we can delete these functions? They have been
-    // replaced by perm_set and perm_set_recursive.
-    RegisterFunction("set_perm", SetPermFn);
-    RegisterFunction("set_perm_recursive", SetPermFn);
-
     // Usage:
     //   set_metadata("filename", "key1", "value1", "key2", "value2", ...)
     // Example: