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Merge branch 'lt/gitlink'

Browse source 
* lt/gitlink:
  Tests for core subproject support
  Expose subprojects as special files to "git diff" machinery
  Fix some "git ls-files -o" fallout from gitlinks
  Teach "git-read-tree -u" to check out submodules as a directory
  Teach git list-objects logic to not follow gitlinks
  Fix gitlink index entry filesystem matching
  Teach "git-read-tree -u" to check out submodules as a directory
  Teach git list-objects logic not to follow gitlinks
  Don't show gitlink directories when we want "other" files
  Teach git-update-index about gitlinks
  Teach directory traversal about subprojects
  Fix thinko in subproject entry sorting
  Teach core object handling functions about gitlinks
  Teach "fsck" not to follow subproject links
  Add "S_IFDIRLNK" file mode infrastructure for git links
  Add 'resolve_gitlink_ref()' helper function
  Avoid overflowing name buffer in deep directory structures
  diff-lib: use ce_mode_from_stat() rather than messing with modes manually
This commit is contained in:
Junio C Hamano 2007-04-21 17:21:10 -07:00
parent 99ebd06c18 1c3e5c4ebc
commit afb5b6a24b
18 changed files with 639 additions and 120 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
builtin-fsck.c
View file

@ -253,6 +253,7 @@ static int fsck_tree(struct tree *item)
case S_IFREG | 0644:
case S_IFLNK:
case S_IFDIR:
case S_IFDIRLNK:
break;
/*
* This is nonstandard, but we had a few of these
@ -703,8 +704,14 @@ int cmd_fsck(int argc, char **argv, const char *prefix)
int i;
read_cache();
for (i = 0; i < active_nr; i++) {
struct blob *blob = lookup_blob(active_cache[i]->sha1);
unsigned int mode;
struct blob *blob;
struct object *obj;
mode = ntohl(active_cache[i]->ce_mode);
if (S_ISDIRLNK(mode))
continue;
blob = lookup_blob(active_cache[i]->sha1);
if (!blob)
continue;
obj = &blob->object;

32
builtin-ls-files.c
View file

@ -89,20 +89,38 @@ static void show_dir_entry(const char *tag, struct dir_entry *ent)
static void show_other_files(struct dir_struct *dir)
{
int i;
/*
* Skip matching and unmerged entries for the paths,
* since we want just "others".
*
* (Matching entries are normally pruned during
* the directory tree walk, but will show up for
* gitlinks because we don't necessarily have
* dir->show_other_directories set to suppress
* them).
*/
for (i = 0; i < dir->nr; i++) {
/* We should not have a matching entry, but we
* may have an unmerged entry for this path.
*/
struct dir_entry *ent = dir->entries[i];
int pos = cache_name_pos(ent->name, ent->len);
int len, pos;
struct cache_entry *ce;
/*
* Remove the '/' at the end that directory
* walking adds for directory entries.
*/
len = ent->len;
if (len && ent->name[len-1] == '/')
len--;
pos = cache_name_pos(ent->name, len);
if (0 <= pos)
die("bug in show-other-files");
continue; /* exact match */
pos = -pos - 1;
if (pos < active_nr) {
ce = active_cache[pos];
if (ce_namelen(ce) == ent->len &&
!memcmp(ce->name, ent->name, ent->len))
if (ce_namelen(ce) == len &&
!memcmp(ce->name, ent->name, len))
continue; /* Yup, this one exists unmerged */
}
show_dir_entry(tag_other, ent);

20
builtin-ls-tree.c
View file

@ -6,6 +6,7 @@
#include "cache.h"
#include "blob.h"
#include "tree.h"
#include "commit.h"
#include "quote.h"
#include "builtin.h"
@ -59,7 +60,24 @@ static int show_tree(const unsigned char *sha1, const char *base, int baselen,
int retval = 0;
const char *type = blob_type;
if (S_ISDIR(mode)) {
if (S_ISDIRLNK(mode)) {
/*
* Maybe we want to have some recursive version here?
*
* Something like:
*
if (show_subprojects(base, baselen, pathname)) {
if (fork()) {
chdir(base);
exec ls-tree;
}
waitpid();
}
*
* ..or similar..
*/
type = commit_type;
} else if (S_ISDIR(mode)) {
if (show_recursive(base, baselen, pathname)) {
retval = READ_TREE_RECURSIVE;
if (!(ls_options & LS_SHOW_TREES))

200
builtin-update-index.c
View file

@ -9,6 +9,7 @@
#include "cache-tree.h"
#include "tree-walk.h"
#include "builtin.h"
#include "refs.h"
/*
* Default to not allowing changes to the list of files. The
@ -60,76 +61,151 @@ static int mark_valid(const char *path)
return -1;
}
static int process_file(const char *path)
static int remove_one_path(const char *path)
{
int size, namelen, option, status;
struct cache_entry *ce;
struct stat st;
if (!allow_remove)
return error("%s: does not exist and --remove not passed", path);
if (remove_file_from_cache(path))
return error("%s: cannot remove from the index", path);
return 0;
}
status = lstat(path, &st);
/*
* Handle a path that couldn't be lstat'ed. It's either:
* - missing file (ENOENT or ENOTDIR). That's ok if we're
* supposed to be removing it and the removal actually
* succeeds.
* - permission error. That's never ok.
*/
static int process_lstat_error(const char *path, int err)
{
if (err == ENOENT || err == ENOTDIR)
return remove_one_path(path);
return error("lstat(\"%s\"): %s", path, strerror(errno));
}
static int add_one_path(struct cache_entry *old, const char *path, int len, struct stat *st)
{
int option, size = cache_entry_size(len);
struct cache_entry *ce = xcalloc(1, size);
memcpy(ce->name, path, len);
ce->ce_flags = htons(len);
fill_stat_cache_info(ce, st);
ce->ce_mode = ce_mode_from_stat(old, st->st_mode);
if (index_path(ce->sha1, path, st, !info_only))
return -1;
option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
if (add_cache_entry(ce, option))
return error("%s: cannot add to the index - missing --add option?", path);
return 0;
}
/*
* Handle a path that was a directory. Four cases:
*
* - it's already a gitlink in the index, and we keep it that
* way, and update it if we can (if we cannot find the HEAD,
* we're going to keep it unchanged in the index!)
*
* - it's a *file* in the index, in which case it should be
* removed as a file if removal is allowed, since it doesn't
* exist as such any more. If removal isn't allowed, it's
* an error.
*
* (NOTE! This is old and arguably fairly strange behaviour.
* We might want to make this an error unconditionally, and
* use "--force-remove" if you actually want to force removal).
*
* - it used to exist as a subdirectory (ie multiple files with
* this particular prefix) in the index, in which case it's wrong
* to try to update it as a directory.
*
* - it doesn't exist at all in the index, but it is a valid
* git directory, and it should be *added* as a gitlink.
*/
static int process_directory(const char *path, int len, struct stat *st)
{
unsigned char sha1[20];
int pos = cache_name_pos(path, len);
/* Exact match: file or existing gitlink */
if (pos >= 0) {
struct cache_entry *ce = active_cache[pos];
if (S_ISDIRLNK(ntohl(ce->ce_mode))) {
/* Do nothing to the index if there is no HEAD! */
if (resolve_gitlink_ref(path, "HEAD", sha1) < 0)
return 0;
return add_one_path(ce, path, len, st);
}
/* Should this be an unconditional error? */
return remove_one_path(path);
}
/* Inexact match: is there perhaps a subdirectory match? */
pos = -pos-1;
while (pos < active_nr) {
struct cache_entry *ce = active_cache[pos++];
if (strncmp(ce->name, path, len))
break;
if (ce->name[len] > '/')
break;
if (ce->name[len] < '/')
continue;
/* Subdirectory match - error out */
return error("%s: is a directory - add individual files instead", path);
}
/* No match - should we add it as a gitlink? */
if (!resolve_gitlink_ref(path, "HEAD", sha1))
return add_one_path(NULL, path, len, st);
/* Error out. */
return error("%s: is a directory - add files inside instead", path);
}
/*
* Process a regular file
*/
static int process_file(const char *path, int len, struct stat *st)
{
int pos = cache_name_pos(path, len);
struct cache_entry *ce = pos < 0 ? NULL : active_cache[pos];
if (ce && S_ISDIRLNK(ntohl(ce->ce_mode)))
return error("%s is already a gitlink, not replacing", path);
return add_one_path(ce, path, len, st);
}
static int process_path(const char *path)
{
int len;
struct stat st;
/* We probably want to do this in remove_file_from_cache() and
* add_cache_entry() instead...
*/
cache_tree_invalidate_path(active_cache_tree, path);
if (status < 0 || S_ISDIR(st.st_mode)) {
/* When we used to have "path" and now we want to add
* "path/file", we need a way to remove "path" before
* being able to add "path/file". However,
* "git-update-index --remove path" would not work.
* --force-remove can be used but this is more user
* friendly, especially since we can do the opposite
* case just fine without --force-remove.
*/
if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
if (allow_remove) {
if (remove_file_from_cache(path))
return error("%s: cannot remove from the index",
path);
else
return 0;
} else if (status < 0) {
return error("%s: does not exist and --remove not passed",
path);
}
}
if (0 == status)
return error("%s: is a directory - add files inside instead",
path);
else
return error("lstat(\"%s\"): %s", path,
strerror(errno));
}
/*
* First things first: get the stat information, to decide
* what to do about the pathname!
*/
if (lstat(path, &st) < 0)
return process_lstat_error(path, errno);
namelen = strlen(path);
size = cache_entry_size(namelen);
ce = xcalloc(1, size);
memcpy(ce->name, path, namelen);
ce->ce_flags = htons(namelen);
fill_stat_cache_info(ce, &st);
len = strlen(path);
if (S_ISDIR(st.st_mode))
return process_directory(path, len, &st);
if (trust_executable_bit && has_symlinks)
ce->ce_mode = create_ce_mode(st.st_mode);
else {
/* If there is an existing entry, pick the mode bits and type
* from it, otherwise assume unexecutable regular file.
*/
struct cache_entry *ent;
int pos = cache_name_pos(path, namelen);
ent = (0 <= pos) ? active_cache[pos] : NULL;
ce->ce_mode = ce_mode_from_stat(ent, st.st_mode);
}
if (index_path(ce->sha1, path, &st, !info_only))
return -1;
option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
if (add_cache_entry(ce, option))
return error("%s: cannot add to the index - missing --add option?",
path);
return 0;
return process_file(path, len, &st);
}
static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
@ -210,8 +286,8 @@ static void update_one(const char *path, const char *prefix, int prefix_length)
report("remove '%s'", path);
goto free_return;
}
if (process_file(p))
die("Unable to process file %s", path);
if (process_path(p))
die("Unable to process path %s", path);
report("add '%s'", path);
free_return:
if (p < path || p > path + strlen(path))

2
cache-tree.c
View file

@ -326,7 +326,7 @@ static int update_one(struct cache_tree *it,
mode = ntohl(ce->ce_mode);
entlen = pathlen - baselen;
}
if (!missing_ok && !has_sha1_file(sha1))
if (mode != S_IFDIRLNK && !missing_ok && !has_sha1_file(sha1))
return error("invalid object %s", sha1_to_hex(sha1));
if (!ce->ce_mode)

20
cache.h
View file

@ -24,6 +24,22 @@
#define DTYPE(de) DT_UNKNOWN
#endif
/*
* A "directory link" is a link to another git directory.
*
* The value 0160000 is not normally a valid mode, and
* also just happens to be S_IFDIR + S_IFLNK
*
* NOTE! We *really* shouldn't depend on the S_IFxxx macros
* always having the same values everywhere. We should use
* our internal git values for these things, and then we can
* translate that to the OS-specific value. It just so
* happens that everybody shares the same bit representation
* in the UNIX world (and apparently wider too..)
*/
#define S_IFDIRLNK 0160000
#define S_ISDIRLNK(m) (((m) & S_IFMT) == S_IFDIRLNK)
/*
* Intensive research over the course of many years has shown that
* port 9418 is totally unused by anything else. Or
@ -104,6 +120,8 @@ static inline unsigned int create_ce_mode(unsigned int mode)
{
if (S_ISLNK(mode))
return htonl(S_IFLNK);
if (S_ISDIR(mode) || S_ISDIRLNK(mode))
return htonl(S_IFDIRLNK);
return htonl(S_IFREG | ce_permissions(mode));
}
static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
@ -121,7 +139,7 @@ static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned in
}
#define canon_mode(mode) \
(S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
S_ISLNK(mode) ? S_IFLNK : S_IFDIR)
S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFDIRLNK)
#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)

15
diff-lib.c
View file

@ -373,7 +373,7 @@ int run_diff_files(struct rev_info *revs, int silent_on_removed)
continue;
}
else
dpath->mode = canon_mode(st.st_mode);
dpath->mode = ntohl(ce_mode_from_stat(ce, st.st_mode));
while (i < entries) {
struct cache_entry *nce = active_cache[i];
@ -390,8 +390,7 @@ int run_diff_files(struct rev_info *revs, int silent_on_removed)
int mode = ntohl(nce->ce_mode);
num_compare_stages++;
hashcpy(dpath->parent[stage-2].sha1, nce->sha1);
dpath->parent[stage-2].mode =
canon_mode(mode);
dpath->parent[stage-2].mode = ntohl(ce_mode_from_stat(nce, mode));
dpath->parent[stage-2].status =
DIFF_STATUS_MODIFIED;
}
@ -440,15 +439,7 @@ int run_diff_files(struct rev_info *revs, int silent_on_removed)
if (!changed && !revs->diffopt.find_copies_harder)
continue;
oldmode = ntohl(ce->ce_mode);
newmode = canon_mode(st.st_mode);
if (!trust_executable_bit &&
S_ISREG(newmode) && S_ISREG(oldmode) &&
((newmode ^ oldmode) == 0111))
newmode = oldmode;
else if (!has_symlinks &&
S_ISREG(newmode) && S_ISLNK(oldmode))
newmode = oldmode;
newmode = ntohl(ce_mode_from_stat(ce, st.st_mode));
diff_change(&revs->diffopt, oldmode, newmode,
ce->sha1, (changed ? null_sha1 : ce->sha1),
ce->name, NULL);

20
diff.c
View file

@ -1397,6 +1397,22 @@ static int populate_from_stdin(struct diff_filespec *s)
return 0;
}
static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
{
int len;
char *data = xmalloc(100);
len = snprintf(data, 100,
"Subproject commit %s\n", sha1_to_hex(s->sha1));
s->data = data;
s->size = len;
s->should_free = 1;
if (size_only) {
s->data = NULL;
free(data);
}
return 0;
}
/*
* While doing rename detection and pickaxe operation, we may need to
* grab the data for the blob (or file) for our own in-core comparison.
@ -1415,6 +1431,10 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
if (s->data)
return err;
if (S_ISDIRLNK(s->mode))
return diff_populate_gitlink(s, size_only);
if (!s->sha1_valid ||
reuse_worktree_file(s->path, s->sha1, 0)) {
struct stat st;

138
dir.c
View file

@ -7,12 +7,17 @@
*/
#include "cache.h"
#include "dir.h"
#include "refs.h"
struct path_simplify {
int len;
const char *path;
};
static int read_directory_recursive(struct dir_struct *dir,
const char *path, const char *base, int baselen,
int check_only, const struct path_simplify *simplify);
int common_prefix(const char **pathspec)
{
const char *path, *slash, *next;
@ -286,15 +291,111 @@ struct dir_entry *dir_add_name(struct dir_struct *dir, const char *pathname, int
return ent;
}
static int dir_exists(const char *dirname, int len)
enum exist_status {
index_nonexistent = 0,
index_directory,
index_gitdir,
};
/*
* The index sorts alphabetically by entry name, which
* means that a gitlink sorts as '\0' at the end, while
* a directory (which is defined not as an entry, but as
* the files it contains) will sort with the '/' at the
* end.
*/
static enum exist_status directory_exists_in_index(const char *dirname, int len)
{
int pos = cache_name_pos(dirname, len);
if (pos >= 0)
return 1;
pos = -pos-1;
if (pos >= active_nr) /* can't */
return 0;
return !strncmp(active_cache[pos]->name, dirname, len);
if (pos < 0)
pos = -pos-1;
while (pos < active_nr) {
struct cache_entry *ce = active_cache[pos++];
unsigned char endchar;
if (strncmp(ce->name, dirname, len))
break;
endchar = ce->name[len];
if (endchar > '/')
break;
if (endchar == '/')
return index_directory;
if (!endchar && S_ISDIRLNK(ntohl(ce->ce_mode)))
return index_gitdir;
}
return index_nonexistent;
}
/*
* When we find a directory when traversing the filesystem, we
* have three distinct cases:
*
* - ignore it
* - see it as a directory
* - recurse into it
*
* and which one we choose depends on a combination of existing
* git index contents and the flags passed into the directory
* traversal routine.
*
* Case 1: If we *already* have entries in the index under that
* directory name, we always recurse into the directory to see
* all the files.
*
* Case 2: If we *already* have that directory name as a gitlink,
* we always continue to see it as a gitlink, regardless of whether
* there is an actual git directory there or not (it might not
* be checked out as a subproject!)
*
* Case 3: if we didn't have it in the index previously, we
* have a few sub-cases:
*
* (a) if "show_other_directories" is true, we show it as
* just a directory, unless "hide_empty_directories" is
* also true and the directory is empty, in which case
* we just ignore it entirely.
* (b) if it looks like a git directory, and we don't have
* 'no_dirlinks' set we treat it as a gitlink, and show it
* as a directory.
* (c) otherwise, we recurse into it.
*/
enum directory_treatment {
show_directory,
ignore_directory,
recurse_into_directory,
};
static enum directory_treatment treat_directory(struct dir_struct *dir,
const char *dirname, int len,
const struct path_simplify *simplify)
{
/* The "len-1" is to strip the final '/' */
switch (directory_exists_in_index(dirname, len-1)) {
case index_directory:
return recurse_into_directory;
case index_gitdir:
if (dir->show_other_directories)
return ignore_directory;
return show_directory;
case index_nonexistent:
if (dir->show_other_directories)
break;
if (!dir->no_dirlinks) {
unsigned char sha1[20];
if (resolve_gitlink_ref(dirname, "HEAD", sha1) == 0)
return show_directory;
}
return recurse_into_directory;
}
/* This is the "show_other_directories" case */
if (!dir->hide_empty_directories)
return show_directory;
if (!read_directory_recursive(dir, dirname, dirname, len, 1, simplify))
return ignore_directory;
return show_directory;
}
/*
@ -353,6 +454,9 @@ static int read_directory_recursive(struct dir_struct *dir, const char *path, co
!strcmp(de->d_name + 1, "git")))
continue;
len = strlen(de->d_name);
/* Ignore overly long pathnames! */
if (len + baselen + 8 > sizeof(fullname))
continue;
memcpy(fullname + baselen, de->d_name, len+1);
if (simplify_away(fullname, baselen + len, simplify))
continue;
@ -377,19 +481,17 @@ static int read_directory_recursive(struct dir_struct *dir, const char *path, co
case DT_DIR:
memcpy(fullname + baselen + len, "/", 2);
len++;
if (dir->show_other_directories &&
!dir_exists(fullname, baselen + len)) {
if (dir->hide_empty_directories &&
!read_directory_recursive(dir,
fullname, fullname,
baselen + len, 1, simplify))
continue;
switch (treat_directory(dir, fullname, baselen + len, simplify)) {
case show_directory:
break;
case recurse_into_directory:
contents += read_directory_recursive(dir,
fullname, fullname, baselen + len, 0, simplify);
continue;
case ignore_directory:
continue;
}
contents += read_directory_recursive(dir,
fullname, fullname, baselen + len, 0, simplify);
continue;
break;
case DT_REG:
case DT_LNK:
break;

3
dir.h
View file

@ -33,7 +33,8 @@ struct dir_struct {
int nr, alloc;
unsigned int show_ignored:1,
show_other_directories:1,
hide_empty_directories:1;
hide_empty_directories:1,
no_dirlinks:1;
struct dir_entry **entries;
/* Exclude info */

45
entry.c
View file

@ -62,26 +62,33 @@ static int create_file(const char *path, unsigned int mode)
return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
}
static void *read_blob_entry(struct cache_entry *ce, const char *path, unsigned long *size)
{
enum object_type type;
void *new = read_sha1_file(ce->sha1, &type, size);
if (new) {
if (type == OBJ_BLOB)
return new;
free(new);
}
return NULL;
}
static int write_entry(struct cache_entry *ce, char *path, struct checkout *state, int to_tempfile)
{
int fd;
void *new;
unsigned long size;
long wrote;
enum object_type type;
new = read_sha1_file(ce->sha1, &type, &size);
if (!new || type != OBJ_BLOB) {
if (new)
free(new);
return error("git-checkout-index: unable to read sha1 file of %s (%s)",
path, sha1_to_hex(ce->sha1));
}
switch (ntohl(ce->ce_mode) & S_IFMT) {
char *buf;
unsigned long nsize;
char *buf, *new;
unsigned long size, nsize;
case S_IFREG:
new = read_blob_entry(ce, path, &size);
if (!new)
return error("git-checkout-index: unable to read sha1 file of %s (%s)",
path, sha1_to_hex(ce->sha1));
if (to_tempfile) {
strcpy(path, ".merge_file_XXXXXX");
fd = mkstemp(path);
@ -111,6 +118,10 @@ static int write_entry(struct cache_entry *ce, char *path, struct checkout *stat
return error("git-checkout-index: unable to write file %s", path);
break;
case S_IFLNK:
new = read_blob_entry(ce, path, &size);
if (!new)
return error("git-checkout-index: unable to read sha1 file of %s (%s)",
path, sha1_to_hex(ce->sha1));
if (to_tempfile || !has_symlinks) {
if (to_tempfile) {
strcpy(path, ".merge_link_XXXXXX");
@ -136,8 +147,13 @@ static int write_entry(struct cache_entry *ce, char *path, struct checkout *stat
"symlink %s (%s)", path, strerror(errno));
}
break;
case S_IFDIRLNK:
if (to_tempfile)
return error("git-checkout-index: cannot create temporary subproject %s", path);
if (mkdir(path, 0777) < 0)
return error("git-checkout-index: cannot create subproject directory %s", path);
break;
default:
free(new);
return error("git-checkout-index: unknown file mode for %s", path);
}
@ -179,6 +195,9 @@ int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
*/
unlink(path);
if (S_ISDIR(st.st_mode)) {
/* If it is a gitlink, leave it alone! */
if (S_ISDIRLNK(ntohl(ce->ce_mode)))
return 0;
if (!state->force)
return error("%s is a directory", path);
remove_subtree(path);

34
list-objects.c
View file

@ -25,6 +25,37 @@ static void process_blob(struct rev_info *revs,
add_object(obj, p, path, name);
}
/*
* Processing a gitlink entry currently does nothing, since
* we do not recurse into the subproject.
*
* We *could* eventually add a flag that actually does that,
* which would involve:
* - is the subproject actually checked out?
* - if so, see if the subproject has already been added
* to the alternates list, and add it if not.
* - process the commit (or tag) the gitlink points to
* recursively.
*
* However, it's unclear whether there is really ever any
* reason to see superprojects and subprojects as such a
* "unified" object pool (potentially resulting in a totally
* humongous pack - avoiding which was the whole point of
* having gitlinks in the first place!).
*
* So for now, there is just a note that we *could* follow
* the link, and how to do it. Whether it necessarily makes
* any sense what-so-ever to ever do that is another issue.
*/
static void process_gitlink(struct rev_info *revs,
const unsigned char *sha1,
struct object_array *p,
struct name_path *path,
const char *name)
{
/* Nothing to do */
}
static void process_tree(struct rev_info *revs,
struct tree *tree,
struct object_array *p,
@ -56,6 +87,9 @@ static void process_tree(struct rev_info *revs,
process_tree(revs,
lookup_tree(entry.sha1),
p, &me, entry.path);
else if (S_ISDIRLNK(entry.mode))
process_gitlink(revs, entry.sha1,
p, &me, entry.path);
else
process_blob(revs,
lookup_blob(entry.sha1),

35
read-cache.c
View file

@ -5,6 +5,7 @@
*/
#include "cache.h"
#include "cache-tree.h"
#include "refs.h"
/* Index extensions.
*
@ -91,6 +92,23 @@ static int ce_compare_link(struct cache_entry *ce, size_t expected_size)
return match;
}
static int ce_compare_gitlink(struct cache_entry *ce)
{
unsigned char sha1[20];
/*
* We don't actually require that the .git directory
* under DIRLNK directory be a valid git directory. It
* might even be missing (in case nobody populated that
* sub-project).
*
* If so, we consider it always to match.
*/
if (resolve_gitlink_ref(ce->name, "HEAD", sha1) < 0)
return 0;
return hashcmp(sha1, ce->sha1);
}
static int ce_modified_check_fs(struct cache_entry *ce, struct stat *st)
{
switch (st->st_mode & S_IFMT) {
@ -102,6 +120,9 @@ static int ce_modified_check_fs(struct cache_entry *ce, struct stat *st)
if (ce_compare_link(ce, xsize_t(st->st_size)))
return DATA_CHANGED;
break;
case S_IFDIR:
if (S_ISDIRLNK(ntohl(ce->ce_mode)))
return 0;
default:
return TYPE_CHANGED;
}
@ -127,6 +148,12 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st)
(has_symlinks || !S_ISREG(st->st_mode)))
changed |= TYPE_CHANGED;
break;
case S_IFDIRLNK:
if (!S_ISDIR(st->st_mode))
changed |= TYPE_CHANGED;
else if (ce_compare_gitlink(ce))
changed |= DATA_CHANGED;
return changed;
default:
die("internal error: ce_mode is %o", ntohl(ce->ce_mode));
}
@ -334,10 +361,14 @@ int add_file_to_cache(const char *path, int verbose)
if (lstat(path, &st))
die("%s: unable to stat (%s)", path, strerror(errno));
if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode))
die("%s: can only add regular files or symbolic links", path);
if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
die("%s: can only add regular files, symbolic links or git-directories", path);
namelen = strlen(path);
if (S_ISDIR(st.st_mode)) {
while (namelen && path[namelen-1] == '/')
namelen--;
}
size = cache_entry_size(namelen);
ce = xcalloc(1, size);
memcpy(ce->name, path, namelen);

80
refs.c
View file

@ -283,6 +283,86 @@ static struct ref_list *get_loose_refs(void)
/* We allow "recursive" symbolic refs. Only within reason, though */
#define MAXDEPTH 5
#define MAXREFLEN (1024)
static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result)
{
FILE *f;
struct cached_refs refs;
struct ref_list *ref;
int retval;
strcpy(name + pathlen, "packed-refs");
f = fopen(name, "r");
if (!f)
return -1;
read_packed_refs(f, &refs);
fclose(f);
ref = refs.packed;
retval = -1;
while (ref) {
if (!strcmp(ref->name, refname)) {
retval = 0;
memcpy(result, ref->sha1, 20);
break;
}
ref = ref->next;
}
free_ref_list(refs.packed);
return retval;
}
static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion)
{
int fd, len = strlen(refname);
char buffer[128], *p;
if (recursion > MAXDEPTH || len > MAXREFLEN)
return -1;
memcpy(name + pathlen, refname, len+1);
fd = open(name, O_RDONLY);
if (fd < 0)
return resolve_gitlink_packed_ref(name, pathlen, refname, result);
len = read(fd, buffer, sizeof(buffer)-1);
close(fd);
if (len < 0)
return -1;
while (len && isspace(buffer[len-1]))
len--;
buffer[len] = 0;
/* Was it a detached head or an old-fashioned symlink? */
if (!get_sha1_hex(buffer, result))
return 0;
/* Symref? */
if (strncmp(buffer, "ref:", 4))
return -1;
p = buffer + 4;
while (isspace(*p))
p++;
return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1);
}
int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result)
{
int len = strlen(path), retval;
char *gitdir;
while (len && path[len-1] == '/')
len--;
if (!len)
return -1;
gitdir = xmalloc(len + MAXREFLEN + 8);
memcpy(gitdir, path, len);
memcpy(gitdir + len, "/.git/", 7);
retval = resolve_gitlink_ref_recursive(gitdir, len+6, refname, result, 0);
free(gitdir);
return retval;
}
const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
{

3
refs.h
View file

@ -60,4 +60,7 @@ extern int check_ref_format(const char *target);
/** rename ref, return 0 on success **/
extern int rename_ref(const char *oldref, const char *newref, const char *logmsg);
/** resolve ref in nested "gitlink" repository */
extern int resolve_gitlink_ref(const char *name, const char *refname, unsigned char *result);
#endif /* REFS_H */

3
sha1_file.c
View file

@ -13,6 +13,7 @@
#include "commit.h"
#include "tag.h"
#include "tree.h"
#include "refs.h"
#ifndef O_NOATIME
#if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
@ -2392,6 +2393,8 @@ int index_path(unsigned char *sha1, const char *path, struct stat *st, int write
path);
free(target);
break;
case S_IFDIR:
return resolve_gitlink_ref(path, "HEAD", sha1);
default:
return error("%s: unsupported file type", path);
}

85
t/t3040-subprojects-basic.sh Executable file
View file

@ -0,0 +1,85 @@
#!/bin/sh
test_description='Basic subproject functionality'
. ./test-lib.sh
test_expect_success 'Super project creation' \
': >Makefile &&
git add Makefile &&
git commit -m "Superproject created"'
cat >expected <<EOF
:000000 160000 00000... A sub1
:000000 160000 00000... A sub2
EOF
test_expect_success 'create subprojects' \
'mkdir sub1 &&
( cd sub1 && git init && : >Makefile && git add * &&
git commit -q -m "subproject 1" ) &&
mkdir sub2 &&
( cd sub2 && git init && : >Makefile && git add * &&
git commit -q -m "subproject 2" ) &&
git update-index --add sub1 &&
git add sub2 &&
git commit -q -m "subprojects added" &&
git diff-tree --abbrev=5 HEAD^ HEAD |cut -d" " -f-3,5- >current &&
git diff expected current'
git branch save HEAD
test_expect_success 'check if fsck ignores the subprojects' \
'git fsck --full'
test_expect_success 'check if commit in a subproject detected' \
'( cd sub1 &&
echo "all:" >>Makefile &&
echo " true" >>Makefile &&
git commit -q -a -m "make all" ) && {
git diff-files --exit-code
test $? = 1
}'
test_expect_success 'check if a changed subproject HEAD can be committed' \
'git commit -q -a -m "sub1 changed" && {
git diff-tree --exit-code HEAD^ HEAD
test $? = 1
}'
test_expect_success 'check if diff-index works for subproject elements' \
'git diff-index --exit-code --cached save -- sub1
test $? = 1'
test_expect_success 'check if diff-tree works for subproject elements' \
'git diff-tree --exit-code HEAD^ HEAD -- sub1
test $? = 1'
test_expect_success 'check if git diff works for subproject elements' \
'git diff --exit-code HEAD^ HEAD
test $? = 1'
test_expect_success 'check if clone works' \
'git ls-files -s >expected &&
git clone -l -s . cloned &&
( cd cloned && git ls-files -s ) >current &&
git diff expected current'
test_expect_success 'removing and adding subproject' \
'git update-index --force-remove -- sub2 &&
mv sub2 sub3 &&
git add sub3 &&
git commit -q -m "renaming a subproject" && {
git diff -M --name-status --exit-code HEAD^ HEAD
test $? = 1
}'
# the index must contain the object name the HEAD of the
# subproject sub1 was at the point "save"
test_expect_success 'checkout in superproject' \
'git checkout save &&
git diff-index --exit-code --raw --cached save -- sub1'
# just interesting what happened...
# git diff --name-status -M save master
test_done

15
tree.c
View file

@ -143,6 +143,14 @@ struct tree *lookup_tree(const unsigned char *sha1)
return (struct tree *) obj;
}
/*
* NOTE! Tree refs to external git repositories
* (ie gitlinks) do not count as real references.
*
* You don't have to have those repositories
* available at all, much less have the objects
* accessible from the current repository.
*/
static void track_tree_refs(struct tree *item)
{
int n_refs = 0, i;
@ -152,8 +160,11 @@ static void track_tree_refs(struct tree *item)
/* Count how many entries there are.. */
init_tree_desc(&desc, item->buffer, item->size);
while (tree_entry(&desc, &entry))
while (tree_entry(&desc, &entry)) {
if (S_ISDIRLNK(entry.mode))
continue;
n_refs++;
}
/* Allocate object refs and walk it again.. */
i = 0;
@ -162,6 +173,8 @@ static void track_tree_refs(struct tree *item)
while (tree_entry(&desc, &entry)) {
struct object *obj;
if (S_ISDIRLNK(entry.mode))
continue;
if (S_ISDIR(entry.mode))
obj = &lookup_tree(entry.sha1)->object;
else