12:37 a.m.
The dirent's d_type field is not portable to all platforms. So we have
to use stat() to determine the type of file for the functions that need
to be cross-platform. Fix virFileChownFiles() by calling the new
virFileIsRegular() function.
Signed-off-by: Stefan Berger <stefanb(a)linux.vnet.ibm.com>
---
src/libvirt_private.syms | 1 +
src/util/virfile.c | 17 +++++++++++++----
src/util/virfile.h | 1 +
3 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 43bbdef8f1..b4ab1f3629 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1796,6 +1796,7 @@ virFileIsDir;
virFileIsExecutable;
virFileIsLink;
virFileIsMountPoint;
+virFileIsRegular;
virFileIsSharedFS;
virFileIsSharedFSType;
virFileLength;
diff --git a/src/util/virfile.c b/src/util/virfile.c
index e41881f6c9..12b41a64e0 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -1851,6 +1851,15 @@ virFileIsDir(const char *path)
return (stat(path, &s) == 0) && S_ISDIR(s.st_mode);
}
+
+bool
+virFileIsRegular(const char *path)
+{
+ struct stat s;
+ return (stat(path, &s) == 0) && S_ISREG(s.st_mode);
+}
+
+
/**
* virFileExists: Check for presence of file
* @path: Path of file to check
@@ -3005,12 +3014,13 @@ int virFileChownFiles(const char *name,
return -1;
while ((direrr = virDirRead(dir, &ent, name)) > 0) {
- if (ent->d_type != DT_REG)
- continue;
-
+ VIR_FREE(path);
if (virAsprintf(&path, "%s/%s", name, ent->d_name) < 0)
goto cleanup;
+ if (!virFileIsRegular(path))
+ continue;
+
if (chown(path, uid, gid) < 0) {
virReportSystemError(errno,
_("cannot chown '%s' to (%u, %u)"),
@@ -3018,7 +3028,6 @@ int virFileChownFiles(const char *name,
(unsigned int) gid);
goto cleanup;
}
- VIR_FREE(path);
}
if (direrr < 0)
diff --git a/src/util/virfile.h b/src/util/virfile.h
index c7a32c30a8..59c14b97a6 100644
--- a/src/util/virfile.h
+++ b/src/util/virfile.h
@@ -194,6 +194,7 @@ off_t virFileLength(const char *path, int fd) ATTRIBUTE_NONNULL(1);
bool virFileIsDir (const char *file) ATTRIBUTE_NONNULL(1);
bool virFileExists(const char *file) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NOINLINE;
bool virFileIsExecutable(const char *file) ATTRIBUTE_NONNULL(1);
+bool virFileIsRegular(const char *file) ATTRIBUTE_NONNULL(1);
enum {
VIR_FILE_SHFS_NFS = (1 << 0),
--
2.14.4
12:48 a.m.
On Wed, Jun 06, 2018 at 12:37:06PM -0400, Stefan Berger wrote:
The dirent's d_type field is not portable to all platforms. So we
have
to use stat() to determine the type of file for the functions that need
to be cross-platform. Fix virFileChownFiles() by calling the new
virFileIsRegular() function.
Signed-off-by: Stefan Berger <stefanb(a)linux.vnet.ibm.com>
---
src/libvirt_private.syms | 1 +
src/util/virfile.c | 17 +++++++++++++----
src/util/virfile.h | 1 +
3 files changed, 15 insertions(+), 4 deletions(-)
Reviewed-by: Daniel P. Berrangé <berrange(a)redhat.com>
Regards,
Daniel
--
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12:57 a.m.
On 06/06/2018 11:37 AM, Stefan Berger wrote:
The dirent's d_type field is not portable to all platforms. So we
have
to use stat() to determine the type of file for the functions that need
to be cross-platform. Fix virFileChownFiles() by calling the new
virFileIsRegular() function.
Signed-off-by: Stefan Berger <stefanb(a)linux.vnet.ibm.com>
---
src/libvirt_private.syms | 1 +
src/util/virfile.c | 17 +++++++++++++----
src/util/virfile.h | 1 +
3 files changed, 15 insertions(+), 4 deletions(-)
+
+bool
+virFileIsRegular(const char *path)
+{
+ struct stat s;
+ return (stat(path, &s) == 0) && S_ISREG(s.st_mode);
This always does a stat.
+}
+
+
/**
* virFileExists: Check for presence of file
* @path: Path of file to check
@@ -3005,12 +3014,13 @@ int virFileChownFiles(const char *name,
return -1;
while ((direrr = virDirRead(dir, &ent, name)) > 0) {
- if (ent->d_type != DT_REG)
- continue;
And this was the non-portable code you're getting rid of, which was
already buggy - even on systems with d_type, a return of DT_UNKNOWN
requires a stat() rather than a blind continue. However, your
replacement is pessimizing platforms where d_type is reliable, by making
us do a stat() where we previously did not need to.
Better would be using macros that use d_type where possible, and fall
back to stat() only when d_type does not exist or is DT_UNKNOWN; for
example, here's how gnulib does it:
#if HAVE_STRUCT_DIRENT_D_TYPE
/* True if the type of the directory entry D is known. */
# define DT_IS_KNOWN(d) ((d)->d_type != DT_UNKNOWN)
/* True if the type of the directory entry D must be T. */
# define DT_MUST_BE(d, t) ((d)->d_type == (t))
# define D_TYPE(d) ((d)->d_type)
#else
# define DT_IS_KNOWN(d) false
# define DT_MUST_BE(d, t) false
# define D_TYPE(d) DT_UNKNOWN
# undef DT_UNKNOWN
# define DT_UNKNOWN 0
(although we have to be careful with licensing, because that is from
lib/fts.c which is marked GPLv3+).
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
8:31 p.m.
On 06/06/2018 12:57 PM, Eric Blake wrote:
On 06/06/2018 11:37 AM, Stefan Berger wrote:
> The dirent's d_type field is not portable to all platforms. So we have
> to use stat() to determine the type of file for the functions that need
> to be cross-platform. Fix virFileChownFiles() by calling the new
> virFileIsRegular() function.
>
> Signed-off-by: Stefan Berger <stefanb(a)linux.vnet.ibm.com>
> ---
> src/libvirt_private.syms | 1 +
> src/util/virfile.c | 17 +++++++++++++----
> src/util/virfile.h | 1 +
> 3 files changed, 15 insertions(+), 4 deletions(-)
> +
> +bool
> +virFileIsRegular(const char *path)
> +{
> + struct stat s;
> + return (stat(path, &s) == 0) && S_ISREG(s.st_mode);
This always does a stat.
> +}
> +
> +
> /**
> * virFileExists: Check for presence of file
> * @path: Path of file to check
> @@ -3005,12 +3014,13 @@ int virFileChownFiles(const char *name,
> return -1;
> while ((direrr = virDirRead(dir, &ent, name)) > 0) {
> - if (ent->d_type != DT_REG)
> - continue;
And this was the non-portable code you're getting rid of, which was
already buggy - even on systems with d_type, a return of DT_UNKNOWN
requires a stat() rather than a blind continue. However, your
replacement is pessimizing platforms where d_type is reliable, by
making us do a stat() where we previously did not need to.
Better would be using macros that use d_type where possible, and fall
back to stat() only when d_type does not exist or is DT_UNKNOWN; for
example, here's how gnulib does it:
#if HAVE_STRUCT_DIRENT_D_TYPE
/* True if the type of the directory entry D is known. */
# define DT_IS_KNOWN(d) ((d)->d_type != DT_UNKNOWN)
/* True if the type of the directory entry D must be T. */
# define DT_MUST_BE(d, t) ((d)->d_type == (t))
# define D_TYPE(d) ((d)->d_type)
#else
# define DT_IS_KNOWN(d) false
# define DT_MUST_BE(d, t) false
# define D_TYPE(d) DT_UNKNOWN
# undef DT_UNKNOWN
# define DT_UNKNOWN 0
(although we have to be careful with licensing, because that is from
lib/fts.c which is marked GPLv3+).
gnulib seems to implement readdir() but they also set d_type there and
what you are showing above is unfortunately not in a header file but in
fts.c :-(
I guess for our purposes it would be good enough to have an equivalent
of HAVE_STRUCT_DIRENT_D_TYPE set by test-compiling in configure?
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2339
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4 comments
3 participants
participants (3)
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Daniel P. Berrangé -
Eric Blake -
Stefan Berger