--list-duplicates codifies what everyone keeps re-implementing with
find -exec b2sum or src:perforate's finddup or whatever.
hardlink already knows this, so make the data available thusly,
in a format well-suited for pipeline processing
(fixed-width key for uniq/cut/&c.,
tab delimiter for cut &a.,
-z for correct filename handling).
---
misc-utils/hardlink.1.adoc | 6 ++++++
misc-utils/hardlink.c | 21 ++++++++++++++++++++-
2 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/misc-utils/hardlink.1.adoc b/misc-utils/hardlink.1.adoc
index b6f07ba70..b85ba09d4 100644
--- a/misc-utils/hardlink.1.adoc
+++ b/misc-utils/hardlink.1.adoc
@@ -76,6 +76,12 @@
*-n*, *--dry-run*::
Do not act, just print what would happen.
+*-l*, *--list-duplicates*::
+Don't link anything, but list the absolute path of every duplicate file, one per line, preceded by a unique 16-byte discriminator and a tab.
+
+*-z*, *--zero*::
+Separate lines with a NUL instead of a newline in *-l* mode.
+
*-o*, *--ignore-owner*::
Link and compare files even if their owner information (user and group) differs. Results may be unpredictable.
diff --git a/misc-utils/hardlink.c b/misc-utils/hardlink.c
index e4b44c6c6..643df7cf2 100644
--- a/misc-utils/hardlink.c
+++ b/misc-utils/hardlink.c
@@ -189,6 +189,8 @@ static struct options {
unsigned int keep_oldest:1;
unsigned int prio_trees:1;
unsigned int dry_run:1;
+ unsigned int list_duplicates:1;
+ char line_delim;
uintmax_t min_size;
uintmax_t max_size;
size_t io_size;
@@ -206,6 +208,7 @@ static struct options {
.respect_xattrs = FALSE,
.keep_oldest = FALSE,
.prio_trees = FALSE,
+ .line_delim = '\n',
.min_size = 1,
.cache_size = 10*1024*1024
};
@@ -1152,6 +1155,10 @@ static void visitor(const void *nodep, const VISIT which, const int depth)
/* final cleanup */
for (other = begin; other != NULL; other = other->next) {
+ if (opts.list_duplicates && other->st.st_nlink > 1)
+ for (struct link *l = other->links; l; l = l->next)
+ printf("%016zu\t%s%c", (size_t)other, l->path, opts.line_delim);
+
if (ul_fileeq_data_associated(&other->data))
ul_fileeq_data_deinit(&other->data);
}
@@ -1182,6 +1189,8 @@ static void __attribute__((__noreturn__)) usage(void)
" lowest hardlink count\n"), out);
fputs(_(" -M, --minimize reverse the meaning of -m\n"), out);
fputs(_(" -n, --dry-run don't actually link anything\n"), out);
+ fputs(_(" -l, --list-duplicates print every group of duplicate files\n"), out);
+ fputs(_(" -z, --zero delimit output with NULs instead of newlines\n"), out);
fputs(_(" -o, --ignore-owner ignore owner changes\n"), out);
fputs(_(" -F, --prioritize-trees files found in the earliest specified top-level\n"
" directory have higher priority (lower precedence\n"
@@ -1223,7 +1232,7 @@ static int parse_options(int argc, char *argv[])
OPT_REFLINK = CHAR_MAX + 1,
OPT_SKIP_RELINKS
};
- static const char optstr[] = "VhvndfpotXcmMFOx:y:i:r:S:s:b:q";
+ static const char optstr[] = "VhvndfpotXcmMFOlzx:y:i:r:S:s:b:q";
static const struct option long_options[] = {
{"version", no_argument, NULL, 'V'},
{"help", no_argument, NULL, 'h'},
@@ -1252,6 +1261,8 @@ static int parse_options(int argc, char *argv[])
{"content", no_argument, NULL, 'c'},
{"quiet", no_argument, NULL, 'q'},
{"cache-size", required_argument, NULL, 'r'},
+ {"list-duplicates", no_argument, NULL, 'l'},
+ {"zero", no_argument, NULL, 'z'},
{NULL, 0, NULL, 0}
};
static const ul_excl_t excl[] = {
@@ -1329,6 +1340,14 @@ static int parse_options(int argc, char *argv[])
case 'b':
opts.io_size = strtosize_or_err(optarg, _("failed to parse I/O size"));
break;
+ case 'l':
+ opts.list_duplicates = TRUE;
+ opts.dry_run = TRUE;
+ quiet = TRUE;
+ break;
+ case 'z':
+ opts.line_delim = '\0';
+ break;
#ifdef USE_REFLINK
case OPT_REFLINK:
reflink_mode = REFLINK_AUTO;
--
2.39.2
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