1 files changed, 103 insertions, 20 deletions

diff --git a/builtin-rm.c b/builtin-rm.c
index 33d04bd01..5b078c419 100644
--- a/builtin-rm.c
+++ b/builtin-rm.c
@@ -7,9 +7,10 @@
 #include "builtin.h"
 #include "dir.h"
 #include "cache-tree.h"
+#include "tree-walk.h"
 
 static const char builtin_rm_usage[] =
-"git-rm [-n] [-v] [-f] <filepattern>...";
+"git-rm [-n] [-f] [--cached] <filepattern>...";
 
 static struct {
 	int nr, alloc;
@@ -41,12 +42,75 @@ static int remove_file(const char *name)
 	return ret;
 }
 
+static int check_local_mod(unsigned char *head)
+{
+	/* items in list are already sorted in the cache order,
+	 * so we could do this a lot more efficiently by using
+	 * tree_desc based traversal if we wanted to, but I am
+	 * lazy, and who cares if removal of files is a tad
+	 * slower than the theoretical maximum speed?
+	 */
+	int i, no_head;
+	int errs = 0;
+
+	no_head = is_null_sha1(head);
+	for (i = 0; i < list.nr; i++) {
+		struct stat st;
+		int pos;
+		struct cache_entry *ce;
+		const char *name = list.name[i];
+		unsigned char sha1[20];
+		unsigned mode;
+
+		pos = cache_name_pos(name, strlen(name));
+		if (pos < 0)
+			continue; /* removing unmerged entry */
+		ce = active_cache[pos];
+
+		if (lstat(ce->name, &st) < 0) {
+			if (errno != ENOENT)
+				fprintf(stderr, "warning: '%s': %s",
+					ce->name, strerror(errno));
+			/* It already vanished from the working tree */
+			continue;
+		}
+		else if (S_ISDIR(st.st_mode)) {
+			/* if a file was removed and it is now a
+			 * directory, that is the same as ENOENT as
+			 * far as git is concerned; we do not track
+			 * directories.
+			 */
+			continue;
+		}
+		if (ce_match_stat(ce, &st, 0))
+			errs = error("'%s' has local modifications "
+				     "(hint: try -f)", ce->name);
+		if (no_head)
+			continue;
+		/*
+		 * It is Ok to remove a newly added path, as long as
+		 * it is cache-clean.
+		 */
+		if (get_tree_entry(head, name, sha1, &mode))
+			continue;
+		/*
+		 * Otherwise make sure the version from the HEAD
+		 * matches the index.
+		 */
+		if (ce->ce_mode != create_ce_mode(mode) ||
+		    hashcmp(ce->sha1, sha1))
+			errs = error("'%s' has changes staged in the index "
+				     "(hint: try -f)", name);
+	}
+	return errs;
+}
+
 static struct lock_file lock_file;
 
 int cmd_rm(int argc, const char **argv, const char *prefix)
 {
 	int i, newfd;
-	int verbose = 0, show_only = 0, force = 0;
+	int show_only = 0, force = 0, index_only = 0, recursive = 0;
 	const char **pathspec;
 	char *seen;
 
@@ -62,23 +126,20 @@ int cmd_rm(int argc, const char **argv, const char *prefix)
 
 		if (*arg != '-')
 			break;
-		if (!strcmp(arg, "--")) {
+		else if (!strcmp(arg, "--")) {
 			i++;
 			break;
 		}
-		if (!strcmp(arg, "-n")) {
+		else if (!strcmp(arg, "-n"))
 			show_only = 1;
-			continue;
-		}
-		if (!strcmp(arg, "-v")) {
-			verbose = 1;
-			continue;
-		}
-		if (!strcmp(arg, "-f")) {
+		else if (!strcmp(arg, "--cached"))
+			index_only = 1;
+		else if (!strcmp(arg, "-f"))
 			force = 1;
-			continue;
-		}
-		usage(builtin_rm_usage);
+		else if (!strcmp(arg, "-r"))
+			recursive = 1;
+		else
+			usage(builtin_rm_usage);
 	}
 	if (argc <= i)
 		usage(builtin_rm_usage);
@@ -99,14 +160,36 @@ int cmd_rm(int argc, const char **argv, const char *prefix)
 	if (pathspec) {
 		const char *match;
 		for (i = 0; (match = pathspec[i]) != NULL ; i++) {
-			if (*match && !seen[i])
-				die("pathspec '%s' did not match any files", match);
+			if (!seen[i])
+				die("pathspec '%s' did not match any files",
+				    match);
+			if (!recursive && seen[i] == MATCHED_RECURSIVELY)
+				die("not removing '%s' recursively without -r",
+				    *match ? match : ".");
 		}
 	}
 
 	/*
+	 * If not forced, the file, the index and the HEAD (if exists)
+	 * must match; but the file can already been removed, since
+	 * this sequence is a natural "novice" way:
+	 *
+	 *	rm F; git fm F
+	 *
+	 * Further, if HEAD commit exists, "diff-index --cached" must
+	 * report no changes unless forced.
+	 */
+	if (!force) {
+		unsigned char sha1[20];
+		if (get_sha1("HEAD", sha1))
+			hashclr(sha1);
+		if (check_local_mod(sha1))
+			exit(1);
+	}
+
+	/*
 	 * First remove the names from the index: we won't commit
-	 * the index unless all of them succeed
+	 * the index unless all of them succeed.
 	 */
 	for (i = 0; i < list.nr; i++) {
 		const char *path = list.name[i];
@@ -121,14 +204,14 @@ int cmd_rm(int argc, const char **argv, const char *prefix)
 		return 0;
 
 	/*
-	 * Then, if we used "-f", remove the filenames from the
-	 * workspace. If we fail to remove the first one, we
+	 * Then, unless we used "--cache", remove the filenames from
+	 * the workspace. If we fail to remove the first one, we
 	 * abort the "git rm" (but once we've successfully removed
 	 * any file at all, we'll go ahead and commit to it all:
 	 * by then we've already committed ourselves and can't fail
 	 * in the middle)
 	 */
-	if (force) {
+	if (!index_only) {
 		int removed = 0;
 		for (i = 0; i < list.nr; i++) {
 			const char *path = list.name[i];