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git/entry.c

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#define USE_THE_REPOSITORY_VARIABLE
#include "git-compat-util.h"
#include "object-store-ll.h"
#include "dir.h"
#include "environment.h"
#include "gettext.h"
#include "hex.h"
#include "name-hash.h"
#include "sparse-index.h"
#include "streaming.h"
#include "submodule.h"
#include "symlinks.h"
#include "progress.h"
#include "fsmonitor.h"
#include "entry.h"
#include "parallel-checkout.h"
static void create_directories(const char *path, int path_len,
const struct checkout *state)
{
char *buf = xmallocz(path_len);
int len = 0;
while (len < path_len) {
do {
buf[len] = path[len];
len++;
} while (len < path_len && path[len] != '/');
if (len >= path_len)
break;
buf[len] = 0;
/*
* For 'checkout-index --prefix=<dir>', <dir> is
* allowed to be a symlink to an existing directory,
* and we set 'state->base_dir_len' below, such that
* we test the path components of the prefix with the
* stat() function instead of the lstat() function.
*/
if (has_dirs_only_path(buf, len, state->base_dir_len))
continue; /* ok, it is already a directory. */
/*
* If this mkdir() would fail, it could be that there
* is already a symlink or something else exists
* there, therefore we then try to unlink it and try
* one more time to create the directory.
*/
if (mkdir(buf, 0777)) {
if (errno == EEXIST && state->force &&
!unlink_or_warn(buf) && !mkdir(buf, 0777))
continue;
die_errno("cannot create directory at '%s'", buf);
}
}
free(buf);
}
static void remove_subtree(struct strbuf *path)
{
DIR *dir = opendir(path->buf);
struct dirent *de;
int origlen = path->len;
if (!dir)
die_errno("cannot opendir '%s'", path->buf);
while ((de = readdir_skip_dot_and_dotdot(dir)) != NULL) {
struct stat st;
strbuf_addch(path, '/');
strbuf_addstr(path, de->d_name);
if (lstat(path->buf, &st))
die_errno("cannot lstat '%s'", path->buf);
if (S_ISDIR(st.st_mode))
remove_subtree(path);
else if (unlink(path->buf))
die_errno("cannot unlink '%s'", path->buf);
strbuf_setlen(path, origlen);
}
closedir(dir);
if (rmdir(path->buf))
die_errno("cannot rmdir '%s'", path->buf);
}
static int create_file(const char *path, unsigned int mode)
{
mode = (mode & 0100) ? 0777 : 0666;
return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
}
void *read_blob_entry(const struct cache_entry *ce, size_t *size)
{
enum object_type type;
unsigned long ul;
void *blob_data = repo_read_object_file(the_repository, &ce->oid,
&type, &ul);
*size = ul;
if (blob_data) {
if (type == OBJ_BLOB)
return blob_data;
free(blob_data);
}
return NULL;
}
static int open_output_fd(char *path, const struct cache_entry *ce, int to_tempfile)
{
int symlink = (ce->ce_mode & S_IFMT) != S_IFREG;
if (to_tempfile) {
xsnprintf(path, TEMPORARY_FILENAME_LENGTH, "%s",
symlink ? ".merge_link_XXXXXX" : ".merge_file_XXXXXX");
return mkstemp(path);
} else {
return create_file(path, !symlink ? ce->ce_mode : 0666);
}
}
int fstat_checkout_output(int fd, const struct checkout *state, struct stat *st)
{
/* use fstat() only when path == ce->name */
if (fstat_is_reliable() &&
state->refresh_cache && !state->base_dir_len) {
return !fstat(fd, st);
}
return 0;
}
static int streaming_write_entry(const struct cache_entry *ce, char *path,
struct stream_filter *filter,
const struct checkout *state, int to_tempfile,
int *fstat_done, struct stat *statbuf)
{
int result = 0;
int fd;
fd = open_output_fd(path, ce, to_tempfile);
if (fd < 0)
return -1;
result |= stream_blob_to_fd(fd, &ce->oid, filter, 1);
*fstat_done = fstat_checkout_output(fd, state, statbuf);
result |= close(fd);
if (result)
unlink(path);
return result;
}
void enable_delayed_checkout(struct checkout *state)
{
if (!state->delayed_checkout) {
state->delayed_checkout = xmalloc(sizeof(*state->delayed_checkout));
state->delayed_checkout->state = CE_CAN_DELAY;
string_list_init_nodup(&state->delayed_checkout->filters);
string_list_init_nodup(&state->delayed_checkout->paths);
}
}
static int remove_available_paths(struct string_list_item *item, void *cb_data)
{
struct string_list *available_paths = cb_data;
struct string_list_item *available;
available = string_list_lookup(available_paths, item->string);
if (available)
available->util = item->util;
return !available;
}
static int string_is_not_null(struct string_list_item *item, void *data UNUSED)
{
return !!item->string;
}
int finish_delayed_checkout(struct checkout *state, int show_progress)
{
int errs = 0;
unsigned processed_paths = 0;
off_t filtered_bytes = 0;
struct string_list_item *filter, *path;
struct progress *progress = NULL;
struct delayed_checkout *dco = state->delayed_checkout;
if (!state->delayed_checkout)
return errs;
dco->state = CE_RETRY;
if (show_progress)
progress = start_delayed_progress(_("Filtering content"), dco->paths.nr);
while (dco->filters.nr > 0) {
for_each_string_list_item(filter, &dco->filters) {
struct string_list available_paths = STRING_LIST_INIT_DUP;
if (!async_query_available_blobs(filter->string, &available_paths)) {
/* Filter reported an error */
errs = 1;
filter->string = NULL;
continue;
}
if (available_paths.nr <= 0) {
/*
* Filter responded with no entries. That means
* the filter is done and we can remove the
* filter from the list (see
* "string_list_remove_empty_items" call below).
*/
filter->string = NULL;
continue;
}
/*
* In dco->paths we store a list of all delayed paths.
* The filter just send us a list of available paths.
* Remove them from the list.
*/
filter_string_list(&dco->paths, 0,
&remove_available_paths, &available_paths);
for_each_string_list_item(path, &available_paths) {
struct cache_entry* ce;
if (!path->util) {
error("external filter '%s' signaled that '%s' "
"is now available although it has not been "
"delayed earlier",
filter->string, path->string);
errs |= 1;
/*
* Do not ask the filter for available blobs,
* again, as the filter is likely buggy.
*/
filter->string = NULL;
continue;
}
ce = index_file_exists(state->istate, path->string,
strlen(path->string), 0);
if (ce) {
display_progress(progress, ++processed_paths);
errs |= checkout_entry(ce, state, NULL, path->util);
filtered_bytes += ce->ce_stat_data.sd_size;
display_throughput(progress, filtered_bytes);
} else
errs = 1;
}
string_list_clear(&available_paths, 0);
}
filter_string_list(&dco->filters, 0, string_is_not_null, NULL);
}
stop_progress(&progress);
string_list_clear(&dco->filters, 0);
/* At this point we should not have any delayed paths anymore. */
errs |= dco->paths.nr;
for_each_string_list_item(path, &dco->paths) {
error("'%s' was not filtered properly", path->string);
}
string_list_clear(&dco->paths, 0);
free(dco);
state->delayed_checkout = NULL;
return errs;
}
void update_ce_after_write(const struct checkout *state, struct cache_entry *ce,
struct stat *st)
{
if (state->refresh_cache) {
assert(state->istate);
fill_stat_cache_info(state->istate, ce, st);
ce->ce_flags |= CE_UPDATE_IN_BASE;
mark_fsmonitor_invalid(state->istate, ce);
state->istate->cache_changed |= CE_ENTRY_CHANGED;
}
}
/* Note: ca is used (and required) iff the entry refers to a regular file. */
static int write_entry(struct cache_entry *ce, char *path, struct conv_attrs *ca,
const struct checkout *state, int to_tempfile,
int *nr_checkouts)
{
unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
struct delayed_checkout *dco = state->delayed_checkout;
int fd, ret, fstat_done = 0;
char *new_blob;
struct strbuf buf = STRBUF_INIT;
size_t size;
ssize_t wrote;
size_t newsize = 0;
struct stat st;
const struct submodule *sub;
struct checkout_metadata meta;
static int scratch_nr_checkouts;
clone_checkout_metadata(&meta, &state->meta, &ce->oid);
if (ce_mode_s_ifmt == S_IFREG) {
struct stream_filter *filter = get_stream_filter_ca(ca, &ce->oid);
if (filter &&
!streaming_write_entry(ce, path, filter,
state, to_tempfile,
&fstat_done, &st))
goto finish;
}
switch (ce_mode_s_ifmt) {
case S_IFLNK:
new_blob = read_blob_entry(ce, &size);
if (!new_blob)
return error("unable to read sha1 file of %s (%s)",
ce->name, oid_to_hex(&ce->oid));
/*
* We can't make a real symlink; write out a regular file entry
* with the symlink destination as its contents.
*/
if (!has_symlinks || to_tempfile)
goto write_file_entry;
ret = symlink(new_blob, path);
free(new_blob);
if (ret)
return error_errno("unable to create symlink %s", path);
break;
case S_IFREG:
/*
* We do not send the blob in case of a retry, so do not
* bother reading it at all.
*/
if (dco && dco->state == CE_RETRY) {
new_blob = NULL;
size = 0;
} else {
new_blob = read_blob_entry(ce, &size);
if (!new_blob)
return error("unable to read sha1 file of %s (%s)",
ce->name, oid_to_hex(&ce->oid));
}
/*
* Convert from git internal format to working tree format
*/
if (dco && dco->state != CE_NO_DELAY) {
ret = async_convert_to_working_tree_ca(ca, ce->name,
new_blob, size,
&buf, &meta, dco);
if (ret) {
struct string_list_item *item =
string_list_lookup(&dco->paths, ce->name);
if (item) {
item->util = nr_checkouts ? nr_checkouts
: &scratch_nr_checkouts;
free(new_blob);
goto delayed;
}
}
} else {
ret = convert_to_working_tree_ca(ca, ce->name, new_blob,
size, &buf, &meta);
}
if (ret) {
free(new_blob);
new_blob = strbuf_detach(&buf, &newsize);
size = newsize;
}
/*
* No "else" here as errors from convert are OK at this
* point. If the error would have been fatal (e.g.
* filter is required), then we would have died already.
*/
write_file_entry:
fd = open_output_fd(path, ce, to_tempfile);
if (fd < 0) {
free(new_blob);
return error_errno("unable to create file %s", path);
}
wrote = write_in_full(fd, new_blob, size);
if (!to_tempfile)
fstat_done = fstat_checkout_output(fd, state, &st);
close(fd);
free(new_blob);
if (wrote < 0)
return error("unable to write file %s", path);
break;
case S_IFGITLINK:
if (to_tempfile)
return error("cannot create temporary submodule %s", ce->name);
if (mkdir(path, 0777) < 0)
return error("cannot create submodule directory %s", path);
sub = submodule_from_ce(ce);
if (sub)
return submodule_move_head(ce->name, state->super_prefix,
NULL, oid_to_hex(&ce->oid),
state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0);
break;
default:
return error("unknown file mode for %s in index", ce->name);
}
finish:
if (state->refresh_cache) {
if (!fstat_done && lstat(ce->name, &st) < 0)
return error_errno("unable to stat just-written file %s",
ce->name);
update_ce_after_write(state, ce , &st);
}
if (nr_checkouts)
(*nr_checkouts)++;
delayed:
return 0;
}
/*
* This is like 'lstat()', except it refuses to follow symlinks
* in the path, after skipping "skiplen".
*/
static int check_path(const char *path, int len, struct stat *st, int skiplen)
{
const char *slash = path + len;
while (path < slash && *slash != '/')
slash--;
if (!has_dirs_only_path(path, slash - path, skiplen)) {
errno = ENOENT;
return -1;
}
return lstat(path, st);
}
static void mark_colliding_entries(const struct checkout *state,
struct cache_entry *ce, struct stat *st)
{
int i, trust_ino = check_stat;
#if defined(GIT_WINDOWS_NATIVE) || defined(__CYGWIN__)
trust_ino = 0;
#endif
ce->ce_flags |= CE_MATCHED;
/* TODO: audit for interaction with sparse-index. */
ensure_full_index(state->istate);
for (i = 0; i < state->istate->cache_nr; i++) {
struct cache_entry *dup = state->istate->cache[i];
if (dup == ce) {
/*
* Parallel checkout doesn't create the files in index
* order. So the other side of the collision may appear
* after the given cache_entry in the array.
*/
if (parallel_checkout_status() == PC_RUNNING)
continue;
else
break;
}
if (dup->ce_flags & (CE_MATCHED | CE_VALID | CE_SKIP_WORKTREE))
continue;
if ((trust_ino && !match_stat_data(&dup->ce_stat_data, st)) ||
paths_collide(ce->name, dup->name)) {
dup->ce_flags |= CE_MATCHED;
break;
}
}
}
int checkout_entry_ca(struct cache_entry *ce, struct conv_attrs *ca,
const struct checkout *state, char *topath,
int *nr_checkouts)
{
static struct strbuf path = STRBUF_INIT;
struct stat st;
struct conv_attrs ca_buf;
if (ce->ce_flags & CE_WT_REMOVE) {
if (topath)
/*
* No content and thus no path to create, so we have
* no pathname to return.
*/
BUG("Can't remove entry to a path");
unlink_entry(ce, state->super_prefix);
return 0;
}
if (topath) {
if (S_ISREG(ce->ce_mode) && !ca) {
convert_attrs(state->istate, &ca_buf, ce->name);
ca = &ca_buf;
}
return write_entry(ce, topath, ca, state, 1, nr_checkouts);
}
strbuf_reset(&path);
strbuf_add(&path, state->base_dir, state->base_dir_len);
strbuf_add(&path, ce->name, ce_namelen(ce));
if (!check_path(path.buf, path.len, &st, state->base_dir_len)) {
const struct submodule *sub;
unsigned changed = ie_match_stat(state->istate, ce, &st,
CE_MATCH_IGNORE_VALID | CE_MATCH_IGNORE_SKIP_WORKTREE);
/*
* Needs to be checked before !changed returns early,
* as the possibly empty directory was not changed
*/
sub = submodule_from_ce(ce);
if (sub) {
int err;
if (!is_submodule_populated_gently(ce->name, &err)) {
struct stat sb;
if (lstat(ce->name, &sb))
die(_("could not stat file '%s'"), ce->name);
if (!(st.st_mode & S_IFDIR))
unlink_or_warn(ce->name);
return submodule_move_head(ce->name, state->super_prefix,
NULL, oid_to_hex(&ce->oid), 0);
} else
return submodule_move_head(ce->name, state->super_prefix,
"HEAD", oid_to_hex(&ce->oid),
state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0);
}
if (!changed)
return 0;
if (!state->force) {
if (!state->quiet)
fprintf(stderr,
"%s already exists, no checkout\n",
path.buf);
return -1;
}
if (state->clone)
mark_colliding_entries(state, ce, &st);
/*
* We unlink the old file, to get the new one with the
* right permissions (including umask, which is nasty
* to emulate by hand - much easier to let the system
* just do the right thing)
*/
if (S_ISDIR(st.st_mode)) {
/* If it is a gitlink, leave it alone! */
if (S_ISGITLINK(ce->ce_mode))
return 0;
/*
* We must avoid replacing submodules' leading
* directories with symbolic links, lest recursive
* clones can write into arbitrary locations.
*
* Technically, this logic is not limited
* to recursive clones, or for that matter to
* submodules' paths colliding with symbolic links'
* paths. Yet it strikes a balance in favor of
* simplicity, and if paths are colliding, we might
* just as well keep the directories during a clone.
*/
if (state->clone && S_ISLNK(ce->ce_mode))
return 0;
remove_subtree(&path);
} else if (unlink(path.buf))
return error_errno("unable to unlink old '%s'", path.buf);
} else if (state->not_new)
return 0;
create_directories(path.buf, path.len, state);
if (S_ISREG(ce->ce_mode) && !ca) {
convert_attrs(state->istate, &ca_buf, ce->name);
ca = &ca_buf;
}
if (!enqueue_checkout(ce, ca, nr_checkouts))
return 0;
return write_entry(ce, path.buf, ca, state, 0, nr_checkouts);
}
void unlink_entry(const struct cache_entry *ce, const char *super_prefix)
{
const struct submodule *sub = submodule_from_ce(ce);
if (sub) {
/* state.force is set at the caller. */
submodule_move_head(ce->name, super_prefix, "HEAD", NULL,
SUBMODULE_MOVE_HEAD_FORCE);
}
if (check_leading_path(ce->name, ce_namelen(ce), 1) >= 0)
return;
if (remove_or_warn(ce->ce_mode, ce->name))
return;
schedule_dir_for_removal(ce->name, ce_namelen(ce));
}
int remove_or_warn(unsigned int mode, const char *file)
{
return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file);
}
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