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diff-index: careful when inspecting work tree items
Earlier, if you changed a staged path into a directory in the work tree,
we happily ran lstat(2) on it and found that it exists, and declared that
the user changed it to a gitlink.
This is wrong for two reasons:
(1) It may be a directory, but it may not be a submodule, and in the
latter case, the change we need to report is "the blob at the path
has disappeared". We need to check with resolve_gitlink_ref() to be
consistent with what "git add" and "git update-index --add" does.
(2) lstat(2) may have succeeded only because a leading component of the
path was turned into a symbolic link that points at something that
exists in the work tree. In such a case, the path itself does not
exist anymore, as far as the index is concerned.
This fixes these breakages in diff-index that the previous patch has
exposed.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
parent
6301f303d4
commit
948dd346fd
69
diff-lib.c
69
diff-lib.c
@ -10,6 +10,7 @@
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#include "cache-tree.h"
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#include "path-list.h"
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#include "unpack-trees.h"
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#include "refs.h"
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/*
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* diff-files
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@ -333,6 +334,26 @@ int run_diff_files_cmd(struct rev_info *revs, int argc, const char **argv)
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}
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return run_diff_files(revs, options);
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}
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/*
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* See if work tree has an entity that can be staged. Return 0 if so,
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* return 1 if not and return -1 if error.
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*/
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static int check_work_tree_entity(const struct cache_entry *ce, struct stat *st, char *symcache)
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{
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if (lstat(ce->name, st) < 0) {
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if (errno != ENOENT && errno != ENOTDIR)
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return -1;
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return 1;
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}
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if (has_symlink_leading_path(ce->name, symcache))
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return 1;
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if (S_ISDIR(st->st_mode)) {
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unsigned char sub[20];
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if (resolve_gitlink_ref(ce->name, "HEAD", sub))
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return 1;
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}
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return 0;
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}
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int run_diff_files(struct rev_info *revs, unsigned int option)
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{
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@ -468,6 +489,11 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
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* diff-index
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*/
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struct oneway_unpack_data {
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struct rev_info *revs;
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char symcache[PATH_MAX];
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};
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/* A file entry went away or appeared */
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static void diff_index_show_file(struct rev_info *revs,
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const char *prefix,
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@ -481,7 +507,8 @@ static void diff_index_show_file(struct rev_info *revs,
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static int get_stat_data(struct cache_entry *ce,
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const unsigned char **sha1p,
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unsigned int *modep,
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int cached, int match_missing)
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int cached, int match_missing,
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struct oneway_unpack_data *cbdata)
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{
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const unsigned char *sha1 = ce->sha1;
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unsigned int mode = ce->ce_mode;
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@ -489,8 +516,11 @@ static int get_stat_data(struct cache_entry *ce,
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if (!cached) {
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int changed;
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struct stat st;
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if (lstat(ce->name, &st) < 0) {
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if (errno == ENOENT && match_missing) {
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changed = check_work_tree_entity(ce, &st, cbdata->symcache);
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if (changed < 0)
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return -1;
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else if (changed) {
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if (match_missing) {
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*sha1p = sha1;
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*modep = mode;
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return 0;
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@ -509,23 +539,25 @@ static int get_stat_data(struct cache_entry *ce,
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return 0;
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}
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static void show_new_file(struct rev_info *revs,
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static void show_new_file(struct oneway_unpack_data *cbdata,
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struct cache_entry *new,
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int cached, int match_missing)
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{
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const unsigned char *sha1;
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unsigned int mode;
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struct rev_info *revs = cbdata->revs;
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/* New file in the index: it might actually be different in
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/*
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* New file in the index: it might actually be different in
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* the working copy.
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*/
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if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0)
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if (get_stat_data(new, &sha1, &mode, cached, match_missing, cbdata) < 0)
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return;
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diff_index_show_file(revs, "+", new, sha1, mode);
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}
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static int show_modified(struct rev_info *revs,
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static int show_modified(struct oneway_unpack_data *cbdata,
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struct cache_entry *old,
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struct cache_entry *new,
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int report_missing,
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@ -533,8 +565,9 @@ static int show_modified(struct rev_info *revs,
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{
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unsigned int mode, oldmode;
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const unsigned char *sha1;
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struct rev_info *revs = cbdata->revs;
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if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0) {
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if (get_stat_data(new, &sha1, &mode, cached, match_missing, cbdata) < 0) {
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if (report_missing)
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diff_index_show_file(revs, "-", old,
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old->sha1, old->ce_mode);
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@ -602,7 +635,8 @@ static void do_oneway_diff(struct unpack_trees_options *o,
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struct cache_entry *idx,
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struct cache_entry *tree)
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{
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struct rev_info *revs = o->unpack_data;
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struct oneway_unpack_data *cbdata = o->unpack_data;
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struct rev_info *revs = cbdata->revs;
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int match_missing, cached;
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/*
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@ -625,7 +659,7 @@ static void do_oneway_diff(struct unpack_trees_options *o,
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* Something added to the tree?
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*/
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if (!tree) {
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show_new_file(revs, idx, cached, match_missing);
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show_new_file(cbdata, idx, cached, match_missing);
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return;
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}
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@ -638,7 +672,7 @@ static void do_oneway_diff(struct unpack_trees_options *o,
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}
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/* Show difference between old and new */
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show_modified(revs, tree, idx, 1, cached, match_missing);
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show_modified(cbdata, tree, idx, 1, cached, match_missing);
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}
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static inline void skip_same_name(struct cache_entry *ce, struct unpack_trees_options *o)
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@ -675,7 +709,8 @@ static int oneway_diff(struct cache_entry **src, struct unpack_trees_options *o)
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{
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struct cache_entry *idx = src[0];
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struct cache_entry *tree = src[1];
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struct rev_info *revs = o->unpack_data;
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struct oneway_unpack_data *cbdata = o->unpack_data;
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struct rev_info *revs = cbdata->revs;
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if (idx && ce_stage(idx))
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skip_same_name(idx, o);
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@ -702,6 +737,7 @@ int run_diff_index(struct rev_info *revs, int cached)
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const char *tree_name;
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struct unpack_trees_options opts;
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struct tree_desc t;
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struct oneway_unpack_data unpack_cb;
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mark_merge_entries();
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@ -711,12 +747,14 @@ int run_diff_index(struct rev_info *revs, int cached)
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if (!tree)
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return error("bad tree object %s", tree_name);
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unpack_cb.revs = revs;
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unpack_cb.symcache[0] = '\0';
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memset(&opts, 0, sizeof(opts));
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opts.head_idx = 1;
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opts.index_only = cached;
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opts.merge = 1;
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opts.fn = oneway_diff;
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opts.unpack_data = revs;
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opts.unpack_data = &unpack_cb;
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opts.src_index = &the_index;
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opts.dst_index = NULL;
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@ -738,6 +776,7 @@ int do_diff_cache(const unsigned char *tree_sha1, struct diff_options *opt)
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struct cache_entry *last = NULL;
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struct unpack_trees_options opts;
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struct tree_desc t;
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struct oneway_unpack_data unpack_cb;
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/*
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* This is used by git-blame to run diff-cache internally;
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@ -766,12 +805,14 @@ int do_diff_cache(const unsigned char *tree_sha1, struct diff_options *opt)
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if (!tree)
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die("bad tree object %s", sha1_to_hex(tree_sha1));
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unpack_cb.revs = &revs;
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unpack_cb.symcache[0] = '\0';
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memset(&opts, 0, sizeof(opts));
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opts.head_idx = 1;
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opts.index_only = 1;
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opts.merge = 1;
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opts.fn = oneway_diff;
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opts.unpack_data = &revs;
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opts.unpack_data = &unpack_cb;
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opts.src_index = &the_index;
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opts.dst_index = &the_index;
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@ -109,7 +109,7 @@ test_expect_failure diff-files '
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diff -u expect-files actual
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'
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test_expect_failure diff-index '
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test_expect_success diff-index '
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git diff-index --raw HEAD -- >actual &&
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diff -u expect-index actual
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'
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