[Toybox] [PATCH] find: add -inum option.

[enh]

find: add -inum option

-inum is a commonly implemented extension to search by inode number.

Linux's fs-layer tracepoints log many events in terms of inodes, so
"find -inum" is useful for mapping those events back to specific files.

Signed-off-by: Greg Hackmann <ghackmann at google.com>

diff --git a/toys/posix/find.c b/toys/posix/find.c
index 69e370d..1e9bdfe 100644
--- a/toys/posix/find.c
+++ b/toys/posix/find.c
@@ -32,6 +32,7 @@
     -ctime N       created N days ago        -mtime N    modified N days
ago
     -newer FILE    newer mtime than FILE     -mindepth # at least # dirs
down
     -depth         ignore contents of dir    -maxdepth # at most # dirs
down
+    -inum  N       inode number N
     -type [bcdflps] (block, char, dir, file, symlink, pipe, socket)

     Numbers N may be prefixed by a - (less than) or + (greater than):
@@ -341,6 +342,9 @@
           test = compare_numsign(new->st.st_size, 512, ss[1]);
       } else if (!strcmp(s, "links")) {
         if (check) test = compare_numsign(new->st.st_nlink, 0, ss[1]);
+      } else if (!strcmp(s, "inum")) {
+        if (check)
+          test = compare_numsign(new->st.st_ino, 0, ss[1]);
       } else if (!strcmp(s, "mindepth") || !strcmp(s, "maxdepth")) {
         if (check) {
           struct dirtree *dt = new;
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