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clone: use dir-iterator to avoid explicit dir traversal 

Replace usage of opendir/readdir/closedir API to traverse directories
recursively, at copy_or_link_directory function, by the dir-iterator
API. This simplifies the code and avoids recursive calls to
copy_or_link_directory.

This process also makes copy_or_link_directory call die() in case of an
error on readdir or stat inside dir_iterator_advance. Previously it
would just print a warning for errors on stat and ignore errors on
readdir, which isn't nice because a local git clone could succeed even
though the .git/objects copy didn't fully succeed.

Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Matheus Tavares 2019-07-10 20:59:03 -03:00 committed by Junio C Hamano
parent 14954b799f
commit ff7ccc8c9a
1 changed files with 25 additions and 22 deletions
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47
builtin/clone.c
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@ -23,6 +23,8 @@
#include "transport.h"
#include "strbuf.h"
#include "dir.h"
#include "dir-iterator.h"
#include "iterator.h"
#include "sigchain.h"
#include "branch.h"
#include "remote.h"
@ -407,42 +409,39 @@ static void mkdir_if_missing(const char *pathname, mode_t mode)
}
static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
const char *src_repo, int src_baselen)
const char *src_repo)
{
struct dirent *de;
struct stat buf;
int src_len, dest_len;
DIR *dir;
dir = opendir(src->buf);
if (!dir)
die_errno(_("failed to open '%s'"), src->buf);
struct dir_iterator *iter;
int iter_status;
unsigned int flags;
mkdir_if_missing(dest->buf, 0777);
flags = DIR_ITERATOR_PEDANTIC | DIR_ITERATOR_FOLLOW_SYMLINKS;
iter = dir_iterator_begin(src->buf, flags);
if (!iter)
die_errno(_("failed to start iterator over '%s'"), src->buf);
strbuf_addch(src, '/');
src_len = src->len;
strbuf_addch(dest, '/');
dest_len = dest->len;
while ((de = readdir(dir)) != NULL) {
while ((iter_status = dir_iterator_advance(iter)) == ITER_OK) {
strbuf_setlen(src, src_len);
strbuf_addstr(src, de->d_name);
strbuf_addstr(src, iter->relative_path);
strbuf_setlen(dest, dest_len);
strbuf_addstr(dest, de->d_name);
if (stat(src->buf, &buf)) {
warning (_("failed to stat %s\n"), src->buf);
continue;
}
if (S_ISDIR(buf.st_mode)) {
if (!is_dot_or_dotdot(de->d_name))
copy_or_link_directory(src, dest,
src_repo, src_baselen);
strbuf_addstr(dest, iter->relative_path);
if (S_ISDIR(iter->st.st_mode)) {
mkdir_if_missing(dest->buf, 0777);
continue;
}
/* Files that cannot be copied bit-for-bit... */
if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
if (!strcmp(iter->relative_path, "info/alternates")) {
copy_alternates(src, src_repo);
continue;
}
@ -459,7 +458,11 @@ static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
if (copy_file_with_time(dest->buf, src->buf, 0666))
die_errno(_("failed to copy file to '%s'"), dest->buf);
}
closedir(dir);
if (iter_status != ITER_DONE) {
strbuf_setlen(src, src_len);
die(_("failed to iterate over '%s'"), src->buf);
}
}
static void clone_local(const char *src_repo, const char *dest_repo)
@ -477,7 +480,7 @@ static void clone_local(const char *src_repo, const char *dest_repo)
get_common_dir(&dest, dest_repo);
strbuf_addstr(&src, "/objects");
strbuf_addstr(&dest, "/objects");
copy_or_link_directory(&src, &dest, src_repo, src.len);
copy_or_link_directory(&src, &dest, src_repo);
strbuf_release(&src);
strbuf_release(&dest);
}