12:29 p.m.
‘file’ is a small, self-contained API which runs a single command, so
it's a good test case for reimplementing APIs.
---
daemon/Makefile.am | 2 ++
daemon/file.c | 80 -----------------------------------------------
daemon/file.ml | 60 +++++++++++++++++++++++++++++++++++
daemon/file.mli | 19 +++++++++++
generator/actions_core.ml | 1 +
5 files changed, 82 insertions(+), 80 deletions(-)
diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index 40b770762..6fb1c5384 100644
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -256,6 +256,7 @@ guestfsd_CFLAGS = \
SOURCES_MLI = \
chroot.mli \
sysroot.mli \
+ file.mli \
utils.mli
SOURCES_ML = \
@@ -263,6 +264,7 @@ SOURCES_ML = \
utils.ml \
sysroot.ml \
chroot.ml \
+ file.ml \
callbacks.ml \
daemon.ml
diff --git a/daemon/file.c b/daemon/file.c
index 84874dc6f..ee79eb507 100644
--- a/daemon/file.c
+++ b/daemon/file.c
@@ -30,7 +30,6 @@
#include "actions.h"
#include "optgroups.h"
-GUESTFSD_EXT_CMD(str_file, file);
GUESTFSD_EXT_CMD(str_zcat, zcat);
GUESTFSD_EXT_CMD(str_bzcat, bzcat);
@@ -449,85 +448,6 @@ do_pwrite_device (const char *device, const char *content, size_t
size,
return pwrite_fd (fd, content, size, offset, device, 1);
}
-/* This runs the 'file' command. */
-char *
-do_file (const char *path)
-{
- CLEANUP_FREE char *buf = NULL;
- const char *display_path = path;
- const int is_dev = STRPREFIX (path, "/dev/");
- struct stat statbuf;
-
- if (!is_dev) {
- buf = sysroot_path (path);
- if (!buf) {
- reply_with_perror ("malloc");
- return NULL;
- }
- path = buf;
-
- /* For non-dev, check this is a regular file, else just return the
- * file type as a string (RHBZ#582484).
- */
- if (lstat (path, &statbuf) == -1) {
- reply_with_perror ("lstat: %s", display_path);
- return NULL;
- }
-
- if (! S_ISREG (statbuf.st_mode)) {
- char *ret;
-
- if (S_ISDIR (statbuf.st_mode))
- ret = strdup ("directory");
- else if (S_ISCHR (statbuf.st_mode))
- ret = strdup ("character device");
- else if (S_ISBLK (statbuf.st_mode))
- ret = strdup ("block device");
- else if (S_ISFIFO (statbuf.st_mode))
- ret = strdup ("FIFO");
- else if (S_ISLNK (statbuf.st_mode))
- ret = strdup ("symbolic link");
- else if (S_ISSOCK (statbuf.st_mode))
- ret = strdup ("socket");
- else
- ret = strdup ("unknown, not regular file");
-
- if (ret == NULL)
- reply_with_perror ("strdup");
- return ret;
- }
- }
-
- /* Which flags to use? For /dev paths, follow links because
- * /dev/VG/LV is a symbolic link.
- */
- const char *flags = is_dev ? "-zbsL" : "-zb";
-
- char *out;
- CLEANUP_FREE char *err = NULL;
- int r = command (&out, &err, str_file, flags, path, NULL);
-
- if (r == -1) {
- free (out);
- reply_with_error ("%s: %s", display_path, err);
- return NULL;
- }
-
- /* We need to remove the trailing \n from output of file(1). */
- size_t len = strlen (out);
- if (len > 0 && out[len-1] == '\n')
- out[--len] = '\0';
-
- /* Some upstream versions of file add a space at the end of the
- * output. This is fixed in the Fedora version, but we might as
- * well fix it here too. (RHBZ#928995).
- */
- if (len > 0 && out[len-1] == ' ')
- out[--len] = '\0';
-
- return out; /* caller frees */
-}
-
/* zcat | file */
char *
do_zfile (const char *method, const char *path)
diff --git a/daemon/file.ml b/daemon/file.ml
new file mode 100644
index 000000000..557de764b
--- /dev/null
+++ b/daemon/file.ml
@@ -0,0 +1,60 @@
+(* guestfs-inspection
+ * Copyright (C) 2009-2017 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *)
+
+open Unix
+open Printf
+
+open Std_utils
+
+open Utils
+
+(* This runs the [file] command. *)
+let file path =
+ let is_dev = String.is_prefix path "/dev/" in
+
+ (* For non-dev, check this is a regular file, else just return the
+ * file type as a string (RHBZ#582484).
+ *)
+ if not is_dev then (
+ let sysroot = Sysroot.sysroot () in
+ let chroot = Chroot.create sysroot ~name:(sprintf "file: %s" path) in
+
+ let statbuf = Chroot.f chroot lstat path in
+ match statbuf.st_kind with
+ | S_DIR -> "directory"
+ | S_CHR -> "character device"
+ | S_BLK -> "block device"
+ | S_FIFO -> "FIFO"
+ | S_LNK -> "symbolic link"
+ | S_SOCK -> "socket"
+ | S_REG ->
+ (* Regular file, so now run [file] on it. *)
+ let out = command "file" ["-zb"; sysroot // path] in
+
+ (* We need to remove the trailing \n from output of file(1).
+ *
+ * Some upstream versions of file add a space at the end of the
+ * output. This is fixed in the Fedora version, but we might as
+ * well fix it here too. (RHBZ#928995).
+ *)
+ String.trimr out
+ )
+ else (* it's a device *) (
+ let out = command "file" ["-zbsL"; path] in
+ String.trimr out
+ )
diff --git a/daemon/file.mli b/daemon/file.mli
new file mode 100644
index 000000000..bd49bad0b
--- /dev/null
+++ b/daemon/file.mli
@@ -0,0 +1,19 @@
+(* guestfs-inspection
+ * Copyright (C) 2009-2017 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *)
+
+val file : string -> string
diff --git a/generator/actions_core.ml b/generator/actions_core.ml
index 0e667eff1..26ed1274e 100644
--- a/generator/actions_core.ml
+++ b/generator/actions_core.ml
@@ -2321,6 +2321,7 @@ and physical volumes." };
{ defaults with
name = "file"; added = (1, 9, 1);
style = RString (RPlainString, "description"), [String (Dev_or_Path,
"path")], [];
+ impl = OCaml "File.file";
tests = [
InitISOFS, Always, TestResultString (
[["file"; "/empty"]], "empty"), [];
--
2.13.0