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btrfs-progs: add dry-run option to restore command

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Sometimes it is useful to see what btrfs restore is going to do
before provisioning enough external storage to restore onto.
Add a dry-run option so we can see what files and paths are found
by restore, without actually restoring any data.

Signed-off-by: Justin Maggard <jmaggard10@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Justin Maggard 2014-02-14 10:40:47 -08:00 committed by Chris Mason
parent 1500c52c75
commit 2a7f8cf9ee
1 changed files with 17 additions and 3 deletions
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20
cmds-restore.c
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@ -53,6 +53,7 @@ static int verbose = 0;
static int ignore_errors = 0;
static int overwrite = 0;
static int get_xattrs = 0;
static int dry_run = 0;
#define LZO_LEN 4
#define PAGE_CACHE_SIZE 4096
@ -801,6 +802,8 @@ static int search_dir(struct btrfs_root *root, struct btrfs_key *key,
}
if (verbose)
printf("Restoring %s\n", path_name);
if (dry_run)
goto next;
fd = open(path_name, O_CREAT|O_WRONLY, 0644);
if (fd < 0) {
fprintf(stderr, "Error creating %s: %d\n",
@ -873,7 +876,10 @@ static int search_dir(struct btrfs_root *root, struct btrfs_key *key,
printf("Restoring %s\n", path_name);
errno = 0;
ret = mkdir(path_name, 0755);
if (dry_run)
ret = 0;
else
ret = mkdir(path_name, 0755);
if (ret && errno != EEXIST) {
free(dir);
fprintf(stderr, "Error mkdiring %s: %d\n",
@ -1090,6 +1096,7 @@ out:
static struct option long_options[] = {
{ "path-regex", 1, NULL, 256},
{ "dry-run", 0, NULL, 'D'},
{ NULL, 0, NULL, 0}
};
@ -1105,9 +1112,10 @@ const char * const cmd_restore_usage[] = {
"-t <location> tree location",
"-f <offset> filesystem location",
"-u <block> super mirror",
"-r <rootid> root objectid",
"-r <rootid> root objectid",
"-d find dir",
"-l list tree roots",
"-D|--dry-run dry run (only list files that would be recovered)",
"--path-regex <regex>",
" restore only filenames matching regex,",
" you have to use following syntax (possibly quoted):",
@ -1135,7 +1143,7 @@ int cmd_restore(int argc, char **argv)
regex_t match_reg, *mreg = NULL;
char reg_err[256];
while ((opt = getopt_long(argc, argv, "sxviot:u:df:r:lc", long_options,
while ((opt = getopt_long(argc, argv, "sxviot:u:df:r:lDc", long_options,
&option_index)) != -1) {
switch (opt) {
@ -1191,6 +1199,9 @@ int cmd_restore(int argc, char **argv)
case 'l':
list_roots = 1;
break;
case 'D':
dry_run = 1;
break;
case 'c':
match_cflags |= REG_ICASE;
break;
@ -1282,6 +1293,9 @@ int cmd_restore(int argc, char **argv)
mreg = &match_reg;
}
if (dry_run)
printf("This is a dry-run, no files are going to be restored\n");
ret = search_dir(root, &key, dir_name, "", mreg);
out: