[Libguestfs] [PATCH] virt-diff: add additional ignore options
Gabriele Cerami
gcerami at redhat.com
Fri Jan 2 22:57:43 UTC 2015
added:
--no-compare-xattrs
--no-compare-extra-stats
--no-compare-perms
--no-compare-uids
--no-compare-times
to ignore specified files informations when comparing.
The current strategy to disable comparison on file informations is to
flatten data structure so they return the same 0/NULL value on
comparison and be, in fact, ignored to determine if the files differ.
This patch preserve original information on copies. Comparison is still
made on flattened structures, but preserved structure are used when
showing file informations
---
diff/diff.c | 81 +++++++++++++++++++++++++++++++++++++++++++-----------
diff/virt-diff.pod | 12 ++++++++
2 files changed, 77 insertions(+), 16 deletions(-)
diff --git a/diff/diff.c b/diff/diff.c
index 6a374af..426184e 100644
--- a/diff/diff.c
+++ b/diff/diff.c
@@ -66,6 +66,11 @@ static int enable_extra_stats = 0;
static int enable_times = 0;
static int enable_uids = 0;
static int enable_xattrs = 0;
+static int no_compare_xattrs = 0;
+static int no_compare_perms = 0;
+static int no_compare_extra_stats = 0;
+static int no_compare_times = 0;
+static int no_compare_uids = 0;
static int time_t_output = 0;
static int time_relative = 0; /* 1 = seconds, 2 = days */
static const char *checksum = NULL;
@@ -125,6 +130,11 @@ usage (int status)
" -V|--version Display version and exit\n"
" -x Trace libguestfs API calls\n"
" --xattrs Display extended attributes\n"
+ " --no-compare-xattrs Do not compare extended attributes\n"
+ " --no-compare-extra-stats Do not compare stats\n"
+ " --no-compare-perms Do not compare permissions\n"
+ " --no-compare-uids Do not compare uid and gid\n"
+ " --no-compare-times Do not compare times\n"
"For more information, see the manpage %s(1).\n"),
program_name, program_name, program_name,
program_name);
@@ -179,6 +189,11 @@ main (int argc, char *argv[])
{ "version", 0, 0, 'V' },
{ "xattr", 0, 0, 0 },
{ "xattrs", 0, 0, 0 },
+ { "no-compare-xattrs", 0, 0, 0 },
+ { "no-compare-perms", 0, 0, 0 },
+ { "no-compare-uids", 0, 0, 0 },
+ { "no-compare-times", 0, 0, 0 },
+ { "no-compare-extra-stats", 0, 0, 0 },
{ 0, 0, 0, 0 }
};
struct drv *drvs = NULL; /* First guest. */
@@ -260,6 +275,16 @@ main (int argc, char *argv[])
} else if (STREQ (long_options[option_index].name, "xattr") ||
STREQ (long_options[option_index].name, "xattrs")) {
enable_xattrs = 1;
+ } else if (STREQ (long_options[option_index].name, "no-compare-xattrs")) {
+ no_compare_xattrs = 1;
+ } else if (STREQ (long_options[option_index].name, "no-compare-perms")) {
+ no_compare_perms = 1;
+ } else if (STREQ (long_options[option_index].name, "no-compare-uids")) {
+ no_compare_uids = 1;
+ } else if (STREQ (long_options[option_index].name, "no-compare-times")) {
+ no_compare_times = 1;
+ } else if (STREQ (long_options[option_index].name, "no-compare-extra-stats")) {
+ no_compare_extra_stats = 1;
} else {
fprintf (stderr, _("%s: unknown long option: %s (%d)\n"),
program_name, long_options[option_index].name, option_index);
@@ -404,6 +429,8 @@ struct file {
char *path;
struct guestfs_statns *stat;
struct guestfs_xattr_list *xattrs;
+ struct guestfs_statns *stat_orig;
+ struct guestfs_xattr_list *xattrs_orig;
char *csum; /* Checksum. If NULL, use file times and size. */
};
@@ -466,6 +493,8 @@ visit_entry (const char *dir, const char *name,
char *path = NULL, *csum = NULL;
struct guestfs_statns *stat = NULL;
struct guestfs_xattr_list *xattrs = NULL;
+ struct guestfs_statns *stat_copy = NULL;
+ struct guestfs_xattr_list *xattrs_copy = NULL;
size_t i;
path = full_path (dir, name);
@@ -474,15 +503,33 @@ visit_entry (const char *dir, const char *name,
* free them after we return.
*/
stat = guestfs_copy_statns (stat_orig);
+ stat_copy = guestfs_copy_statns (stat_orig);
if (stat == NULL) {
perror ("guestfs_copy_stat");
goto error;
}
+ if (no_compare_perms)
+ stat->st_mode &= 0170000;
+
+ if (no_compare_extra_stats)
+ stat->st_dev = stat->st_ino = stat->st_nlink = stat->st_rdev =
+ stat->st_blocks = 0;
+
+ if (no_compare_uids)
+ stat->st_uid = stat->st_gid = 0;
+
+ if (no_compare_times)
+ stat->st_atime_sec = stat->st_mtime_sec = stat->st_ctime_sec =
+ stat->st_atime_nsec = stat->st_mtime_nsec = stat->st_ctime_nsec = 0;
+
xattrs = guestfs_copy_xattr_list (xattrs_orig);
+ xattrs_copy = guestfs_copy_xattr_list (xattrs_orig);
if (xattrs == NULL) {
perror ("guestfs_copy_xattr_list");
goto error;
}
+ if (no_compare_xattrs)
+ xattrs->len = 0;
if (checksum && is_reg (stat->st_mode)) {
csum = guestfs_checksum (t->g, checksum, path);
@@ -534,6 +581,8 @@ visit_entry (const char *dir, const char *name,
t->files[i].stat = stat;
t->files[i].xattrs = xattrs;
t->files[i].csum = csum;
+ t->files[i].stat_orig = stat_copy;
+ t->files[i].xattrs_orig = xattrs_copy;
return 0;
@@ -778,29 +827,29 @@ output_file (guestfs_h *g, struct file *file)
filetype = "u";
output_string (filetype);
- output_int64_perms (file->stat->st_mode & 07777);
+ output_int64_perms (file->stat_orig->st_mode & 07777);
- output_int64_size (file->stat->st_size);
+ output_int64_size (file->stat_orig->st_size);
/* Display extra fields when enabled. */
if (enable_uids) {
- output_int64_uid (file->stat->st_uid);
- output_int64_uid (file->stat->st_gid);
+ output_int64_uid (file->stat_orig->st_uid);
+ output_int64_uid (file->stat_orig->st_gid);
}
if (enable_times) {
if (atime)
- output_int64_time (file->stat->st_atime_sec, file->stat->st_atime_nsec);
- output_int64_time (file->stat->st_mtime_sec, file->stat->st_mtime_nsec);
- output_int64_time (file->stat->st_ctime_sec, file->stat->st_ctime_nsec);
+ output_int64_time (file->stat_orig->st_atime_sec, file->stat_orig->st_atime_nsec);
+ output_int64_time (file->stat_orig->st_mtime_sec, file->stat_orig->st_mtime_nsec);
+ output_int64_time (file->stat_orig->st_ctime_sec, file->stat_orig->st_ctime_nsec);
}
if (enable_extra_stats) {
- output_int64_dev (file->stat->st_dev);
- output_int64 (file->stat->st_ino);
- output_int64 (file->stat->st_nlink);
- output_int64_dev (file->stat->st_rdev);
- output_int64 (file->stat->st_blocks);
+ output_int64_dev (file->stat_orig->st_dev);
+ output_int64 (file->stat_orig->st_ino);
+ output_int64 (file->stat_orig->st_nlink);
+ output_int64_dev (file->stat_orig->st_rdev);
+ output_int64 (file->stat_orig->st_blocks);
}
if (file->csum)
@@ -816,10 +865,10 @@ output_file (guestfs_h *g, struct file *file)
}
if (enable_xattrs) {
- for (i = 0; i < file->xattrs->len; ++i) {
- output_string (file->xattrs->val[i].attrname);
- output_binary (file->xattrs->val[i].attrval,
- file->xattrs->val[i].attrval_len);
+ for (i = 0; i < file->xattrs_orig->len; ++i) {
+ output_string (file->xattrs_orig->val[i].attrname);
+ output_binary (file->xattrs_orig->val[i].attrval,
+ file->xattrs_orig->val[i].attrval_len);
}
}
}
diff --git a/diff/virt-diff.pod b/diff/virt-diff.pod
index e1d67f3..4ffb33a 100644
--- a/diff/virt-diff.pod
+++ b/diff/virt-diff.pod
@@ -214,6 +214,18 @@ Enable tracing of libguestfs API calls.
Display extended attributes.
+=item B<--no-compare-xattrs>
+
+=item B<--no-compare-extra-stats>
+
+=item B<--no-compare-perms>
+
+=item B<--no-compare-uids>
+
+=item B<--no-compare-times>
+
+When comparing, do not consider files different if xattrs, extra-stats, permissions, uid/gid and times differ, respectively
+
=back
=head1 NOTE ABOUT CSV FORMAT
--
1.9.3
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