Björn Steinbrink <B.Steinbrink@xxxxxx> writes:
> when you cherry-pick -n a commit that has changes to a file missing in
> the current tree, that file will be added as "Unmerged". A subsequent
> cherry-pick that tries to pick a commit that has changes to that file
> will then fail with:
>
> fatal: git-write-tree: error building trees
Yeah, this was because the original "rewrite in C" did somewhat
a sloppy job while stealing code from git-write-tree.
The caller pretends as if the write_tree() function would return
an error code and being able to issue a sensible error message
itself, but write_tree() function just calls die() and never
returns an error. Worse yet, the function claims that it was
running git-write-tree (which is no longer true after
cherry-pick stole it).
I think you would need to do something like this patch. I will
not apply it during the -rc period, but testing and resending
with "Tested-by:" would be helpful after post 1.5.4 cycle opens.
---
builtin-revert.c | 5 ++-
builtin-write-tree.c | 74 +++++++++++---------------------------------------
builtin.h | 1 -
cache-tree.c | 59 +++++++++++++++++++++++++++++++++++++++
cache-tree.h | 5 +++
5 files changed, 83 insertions(+), 61 deletions(-)
diff --git a/builtin-revert.c b/builtin-revert.c
index 4bf8eb2..d71f414 100644
--- a/builtin-revert.c
+++ b/builtin-revert.c
@@ -8,6 +8,7 @@
#include "exec_cmd.h"
#include "utf8.h"
#include "parse-options.h"
+#include "cache-tree.h"
/*
* This implements the builtins revert and cherry-pick.
@@ -270,7 +271,7 @@ static int revert_or_cherry_pick(int argc, const char **argv)
* that represents the "current" state for merge-recursive
* to work on.
*/
- if (write_tree(head, 0, NULL))
+ if (write_cache_as_tree(head, 0, NULL))
die ("Your index file is unmerged.");
} else {
struct wt_status s;
@@ -357,7 +358,7 @@ static int revert_or_cherry_pick(int argc, const char **argv)
if (merge_recursive(sha1_to_hex(base->object.sha1),
sha1_to_hex(head), "HEAD",
sha1_to_hex(next->object.sha1), oneline) ||
- write_tree(head, 0, NULL)) {
+ write_cache_as_tree(head, 0, NULL)) {
add_to_msg("\nConflicts:\n\n");
read_cache();
for (i = 0; i < active_nr;) {
diff --git a/builtin-write-tree.c b/builtin-write-tree.c
index b89d02e..e838d01 100644
--- a/builtin-write-tree.c
+++ b/builtin-write-tree.c
@@ -11,66 +11,12 @@
static const char write_tree_usage[] =
"git-write-tree [--missing-ok] [--prefix=<prefix>/]";
-int write_tree(unsigned char *sha1, int missing_ok, const char *prefix)
-{
- int entries, was_valid, newfd;
-
- /* We can't free this memory, it becomes part of a linked list parsed atexit() */
- struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
-
- newfd = hold_locked_index(lock_file, 1);
-
- entries = read_cache();
- if (entries < 0)
- die("git-write-tree: error reading cache");
-
- if (!active_cache_tree)
- active_cache_tree = cache_tree();
-
- was_valid = cache_tree_fully_valid(active_cache_tree);
-
- if (!was_valid) {
- if (cache_tree_update(active_cache_tree,
- active_cache, active_nr,
- missing_ok, 0) < 0)
- die("git-write-tree: error building trees");
- if (0 <= newfd) {
- if (!write_cache(newfd, active_cache, active_nr)
- && !close(newfd)) {
- commit_lock_file(lock_file);
- newfd = -1;
- }
- }
- /* Not being able to write is fine -- we are only interested
- * in updating the cache-tree part, and if the next caller
- * ends up using the old index with unupdated cache-tree part
- * it misses the work we did here, but that is just a
- * performance penalty and not a big deal.
- */
- }
-
- if (prefix) {
- struct cache_tree *subtree =
- cache_tree_find(active_cache_tree, prefix);
- if (!subtree)
- die("git-write-tree: prefix %s not found", prefix);
- hashcpy(sha1, subtree->sha1);
- }
- else
- hashcpy(sha1, active_cache_tree->sha1);
-
- if (0 <= newfd)
- close(newfd);
- rollback_lock_file(lock_file);
-
- return 0;
-}
-
int cmd_write_tree(int argc, const char **argv, const char *unused_prefix)
{
int missing_ok = 0, ret;
const char *prefix = NULL;
unsigned char sha1[20];
+ const char *me = "git-write-tree";
git_config(git_default_config);
while (1 < argc) {
@@ -87,8 +33,20 @@ int cmd_write_tree(int argc, const char **argv, const char *unused_prefix)
if (argc > 2)
die("too many options");
- ret = write_tree(sha1, missing_ok, prefix);
- printf("%s\n", sha1_to_hex(sha1));
-
+ ret = write_cache_as_tree(sha1, missing_ok, prefix);
+ switch (ret) {
+ case 0:
+ printf("%s\n", sha1_to_hex(sha1));
+ break;
+ case WRITE_TREE_UNREADABLE_INDEX:
+ die("%s: error reading the index", me);
+ break;
+ case WRITE_TREE_UNMERGED_INDEX:
+ die("%s: error building trees; the index is unmerged?", me);
+ break;
+ case WRITE_TREE_PREFIX_ERROR:
+ die("%s: prefix %s not found", me, prefix);
+ break;
+ }
return ret;
}
diff --git a/builtin.h b/builtin.h
index cb675c4..3d1628c 100644
--- a/builtin.h
+++ b/builtin.h
@@ -8,7 +8,6 @@ extern const char git_usage_string[];
extern void list_common_cmds_help(void);
extern void help_unknown_cmd(const char *cmd);
-extern int write_tree(unsigned char *sha1, int missing_ok, const char *prefix);
extern void prune_packed_objects(int);
extern int cmd_add(int argc, const char **argv, const char *prefix);
diff --git a/cache-tree.c b/cache-tree.c
index 50b3526..69d0b46 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -529,3 +529,62 @@ struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
}
return it;
}
+
+int write_cache_as_tree(unsigned char *sha1, int missing_ok, const char *prefix)
+{
+ int entries, was_valid, newfd;
+
+ /*
+ * We can't free this memory, it becomes part of a linked list
+ * parsed atexit()
+ */
+ struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
+
+ newfd = hold_locked_index(lock_file, 1);
+
+ entries = read_cache();
+ if (entries < 0)
+ return WRITE_TREE_UNREADABLE_INDEX;
+
+ if (!active_cache_tree)
+ active_cache_tree = cache_tree();
+
+ was_valid = cache_tree_fully_valid(active_cache_tree);
+
+ if (!was_valid) {
+ if (cache_tree_update(active_cache_tree,
+ active_cache, active_nr,
+ missing_ok, 0) < 0)
+ return WRITE_TREE_UNMERGED_INDEX;
+ if (0 <= newfd) {
+ if (!write_cache(newfd, active_cache, active_nr)
+ && !close(newfd)) {
+ commit_lock_file(lock_file);
+ newfd = -1;
+ }
+ }
+ /* Not being able to write is fine -- we are only interested
+ * in updating the cache-tree part, and if the next caller
+ * ends up using the old index with unupdated cache-tree part
+ * it misses the work we did here, but that is just a
+ * performance penalty and not a big deal.
+ */
+ }
+
+ if (prefix) {
+ struct cache_tree *subtree =
+ cache_tree_find(active_cache_tree, prefix);
+ if (!subtree)
+ return WRITE_TREE_PREFIX_ERROR;
+ hashcpy(sha1, subtree->sha1);
+ }
+ else
+ hashcpy(sha1, active_cache_tree->sha1);
+
+ if (0 <= newfd)
+ close(newfd);
+ rollback_lock_file(lock_file);
+
+ return 0;
+}
+
diff --git a/cache-tree.h b/cache-tree.h
index 8243228..44aad42 100644
--- a/cache-tree.h
+++ b/cache-tree.h
@@ -30,4 +30,9 @@ int cache_tree_update(struct cache_tree *, struct cache_entry **, int, int, int)
struct cache_tree *cache_tree_find(struct cache_tree *, const char *);
+#define WRITE_TREE_UNREADABLE_INDEX (-1)
+#define WRITE_TREE_UNMERGED_INDEX (-2)
+#define WRITE_TREE_PREFIX_ERROR (-3)
+
+int write_cache_as_tree(unsigned char *sha1, int missing_ok, const char *prefix);
#endif
-
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