mirror of
https://github.com/git/git.git
synced 2024-10-31 06:17:56 +01:00
691f1a28bf
This helps to notice when something's going wrong, especially on systems which lock open files. I used the following criteria when selecting the code for replacement: - it was already printing a warning for the unlink failures - it is in a function which already printing something or is called from such a function - it is in a static function, returning void and the function is only called from a builtin main function (cmd_) - it is in a function which handles emergency exit (signal handlers) - it is in a function which is obvously cleaning up the lockfiles Signed-off-by: Alex Riesen <raa.lkml@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
220 lines
5.6 KiB
C
220 lines
5.6 KiB
C
#include "cache.h"
|
|
#include "blob.h"
|
|
#include "dir.h"
|
|
|
|
static void create_directories(const char *path, int path_len,
|
|
const struct checkout *state)
|
|
{
|
|
char *buf = xmalloc(path_len + 1);
|
|
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("cannot create directory at %s", buf);
|
|
}
|
|
}
|
|
free(buf);
|
|
}
|
|
|
|
static void remove_subtree(const char *path)
|
|
{
|
|
DIR *dir = opendir(path);
|
|
struct dirent *de;
|
|
char pathbuf[PATH_MAX];
|
|
char *name;
|
|
|
|
if (!dir)
|
|
die("cannot opendir %s (%s)", path, strerror(errno));
|
|
strcpy(pathbuf, path);
|
|
name = pathbuf + strlen(path);
|
|
*name++ = '/';
|
|
while ((de = readdir(dir)) != NULL) {
|
|
struct stat st;
|
|
if (is_dot_or_dotdot(de->d_name))
|
|
continue;
|
|
strcpy(name, de->d_name);
|
|
if (lstat(pathbuf, &st))
|
|
die("cannot lstat %s (%s)", pathbuf, strerror(errno));
|
|
if (S_ISDIR(st.st_mode))
|
|
remove_subtree(pathbuf);
|
|
else if (unlink(pathbuf))
|
|
die("cannot unlink %s (%s)", pathbuf, strerror(errno));
|
|
}
|
|
closedir(dir);
|
|
if (rmdir(path))
|
|
die("cannot rmdir %s (%s)", path, strerror(errno));
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static void *read_blob_entry(struct cache_entry *ce, 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, const struct checkout *state, int to_tempfile)
|
|
{
|
|
unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
|
|
int fd, ret, fstat_done = 0;
|
|
char *new;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
unsigned long size;
|
|
size_t wrote, newsize = 0;
|
|
struct stat st;
|
|
|
|
switch (ce_mode_s_ifmt) {
|
|
case S_IFREG:
|
|
case S_IFLNK:
|
|
new = read_blob_entry(ce, &size);
|
|
if (!new)
|
|
return error("git checkout-index: unable to read sha1 file of %s (%s)",
|
|
path, sha1_to_hex(ce->sha1));
|
|
|
|
if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) {
|
|
ret = symlink(new, path);
|
|
free(new);
|
|
if (ret)
|
|
return error("git checkout-index: unable to create symlink %s (%s)",
|
|
path, strerror(errno));
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Convert from git internal format to working tree format
|
|
*/
|
|
if (ce_mode_s_ifmt == S_IFREG &&
|
|
convert_to_working_tree(ce->name, new, size, &buf)) {
|
|
free(new);
|
|
new = strbuf_detach(&buf, &newsize);
|
|
size = newsize;
|
|
}
|
|
|
|
if (to_tempfile) {
|
|
if (ce_mode_s_ifmt == S_IFREG)
|
|
strcpy(path, ".merge_file_XXXXXX");
|
|
else
|
|
strcpy(path, ".merge_link_XXXXXX");
|
|
fd = mkstemp(path);
|
|
} else if (ce_mode_s_ifmt == S_IFREG) {
|
|
fd = create_file(path, ce->ce_mode);
|
|
} else {
|
|
fd = create_file(path, 0666);
|
|
}
|
|
if (fd < 0) {
|
|
free(new);
|
|
return error("git checkout-index: unable to create file %s (%s)",
|
|
path, strerror(errno));
|
|
}
|
|
|
|
wrote = write_in_full(fd, new, size);
|
|
/* use fstat() only when path == ce->name */
|
|
if (fstat_is_reliable() &&
|
|
state->refresh_cache && !to_tempfile && !state->base_dir_len) {
|
|
fstat(fd, &st);
|
|
fstat_done = 1;
|
|
}
|
|
close(fd);
|
|
free(new);
|
|
if (wrote != size)
|
|
return error("git checkout-index: unable to write file %s", path);
|
|
break;
|
|
case S_IFGITLINK:
|
|
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:
|
|
return error("git checkout-index: unknown file mode for %s", path);
|
|
}
|
|
|
|
if (state->refresh_cache) {
|
|
if (!fstat_done)
|
|
lstat(ce->name, &st);
|
|
fill_stat_cache_info(ce, &st);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
|
|
{
|
|
static char path[PATH_MAX + 1];
|
|
struct stat st;
|
|
int len = state->base_dir_len;
|
|
|
|
if (topath)
|
|
return write_entry(ce, topath, state, 1);
|
|
|
|
memcpy(path, state->base_dir, len);
|
|
strcpy(path + len, ce->name);
|
|
len += ce_namelen(ce);
|
|
|
|
if (!lstat(path, &st)) {
|
|
unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID);
|
|
if (!changed)
|
|
return 0;
|
|
if (!state->force) {
|
|
if (!state->quiet)
|
|
fprintf(stderr, "git-checkout-index: %s already exists\n", path);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
if (!state->force)
|
|
return error("%s is a directory", path);
|
|
remove_subtree(path);
|
|
} else if (unlink(path))
|
|
return error("unable to unlink old '%s' (%s)", path, strerror(errno));
|
|
} else if (state->not_new)
|
|
return 0;
|
|
create_directories(path, len, state);
|
|
return write_entry(ce, path, state, 0);
|
|
}
|