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worktree repair: detect relative path in .git file correctly #2205

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66 changes: 40 additions & 26 deletions setup.c
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Original file line number Diff line number Diff line change
Expand Up @@ -963,15 +963,48 @@ void read_gitfile_error_die(int error_code, const char *path)
*/
const char *read_gitfile_gently(const char *path, int *return_error_code)
{
const int max_file_size = 1 << 20; /* 1MB */
int error_code = 0;
char *buf = NULL;
char *dir = NULL;
const char *slash;
static struct strbuf realpath = STRBUF_INIT;

buf = xstrdup_or_null(read_gitfile_raw(path, &error_code));
if (error_code)
goto cleanup_return;

if (!is_absolute_path(buf) && (slash = strrchr(path, '/'))) {
size_t pathlen = slash+1 - path;
char *dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
(int)strlen(buf), buf);
free(buf);
buf = dir;
}
if (!is_git_directory(buf)) {
error_code = READ_GITFILE_ERR_NOT_A_REPO;
goto cleanup_return;
}

strbuf_realpath(&realpath, buf, 1);

cleanup_return:
if (return_error_code)
*return_error_code = error_code;
else if (error_code)
read_gitfile_error_die(error_code, path);

free(buf);
return error_code ? NULL : realpath.buf;
}

const char *read_gitfile_raw(const char *path, int *return_error_code)
{
const int max_file_size = 1 << 20; /* 1MB */
int error_code = 0;
char *buf = NULL;
struct stat st;
int fd;
ssize_t len;
static struct strbuf realpath = STRBUF_INIT;
static struct strbuf contents = STRBUF_INIT;

if (stat(path, &st)) {
if (errno == ENOENT || errno == ENOTDIR)
Expand Down Expand Up @@ -1014,32 +1047,13 @@ const char *read_gitfile_gently(const char *path, int *return_error_code)
error_code = READ_GITFILE_ERR_NO_PATH;
goto cleanup_return;
}
buf[len] = '\0';
dir = buf + 8;

if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
size_t pathlen = slash+1 - path;
dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
(int)(len - 8), buf + 8);
free(buf);
buf = dir;
}
if (!is_git_directory(dir)) {
error_code = READ_GITFILE_ERR_NOT_A_REPO;
goto cleanup_return;
}

strbuf_realpath(&realpath, dir, 1);
path = realpath.buf;
strbuf_reset(&contents);
strbuf_add(&contents, buf+8, len-8);

cleanup_return:
if (return_error_code)
*return_error_code = error_code;
else if (error_code)
read_gitfile_error_die(error_code, path);

*return_error_code = error_code;
free(buf);
return error_code ? NULL : path;
return error_code ? NULL : contents.buf;
}

static void apply_gitdir_and_environment(struct repository *repo, const char *path)
Expand Down
1 change: 1 addition & 0 deletions setup.h
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Expand Up @@ -40,6 +40,7 @@ int is_nonbare_repository_dir(struct strbuf *path);
#define READ_GITFILE_ERR_IS_A_DIR 10
void read_gitfile_error_die(int error_code, const char *path);
const char *read_gitfile_gently(const char *path, int *return_error_code);
const char *read_gitfile_raw(const char *path, int *return_error_code);
#define read_gitfile(path) read_gitfile_gently((path), NULL)
const char *resolve_gitdir_gently(const char *suspect, int *return_error_code);
#define resolve_gitdir(path) resolve_gitdir_gently((path), NULL)
Expand Down
54 changes: 42 additions & 12 deletions t/t2406-worktree-repair.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -228,30 +228,60 @@ test_expect_success 'repair worktree with relative path with missing gitfile' '
test_cmp expect wt/.git
'

test_expect_success 'repair absolute worktree to use relative paths' '
test_when_finished "rm -rf main side sidemoved" &&
test_expect_success 'repair absolute to relative from side worktree' '
test_when_finished "rm -rf main side" &&
test_create_repo main &&
test_commit -C main init &&
git -C main worktree add --detach ../side &&
echo "../../../../sidemoved/.git" >expect-gitdir &&
echo "../../../../side/.git" >expect-gitdir &&
echo "gitdir: ../main/.git/worktrees/side" >expect-gitfile &&
mv side sidemoved &&
git -C main worktree repair --relative-paths ../sidemoved &&
git -C main worktree repair --relative-paths ../side 2>main/err &&
test_grep "gitdir absolute/relative path mismatch" main/err &&
test_cmp expect-gitdir main/.git/worktrees/side/gitdir &&
test_cmp expect-gitfile sidemoved/.git
test_cmp expect-gitfile side/.git
'

test_expect_success 'repair relative worktree to use absolute paths' '
test_when_finished "rm -rf main side sidemoved" &&
test_expect_success 'repair relative to absolute from side worktree' '
test_when_finished "rm -rf main side" &&
test_create_repo main &&
test_commit -C main init &&
git -C main worktree add --relative-paths --detach ../side &&
echo "$(pwd)/sidemoved/.git" >expect-gitdir &&
echo "$(pwd)/side/.git" >expect-gitdir &&
echo "gitdir: $(pwd)/main/.git/worktrees/side" >expect-gitfile &&
mv side sidemoved &&
git -C main worktree repair ../sidemoved &&
git -C main worktree repair ../side 2>main/err &&
test_grep "gitdir absolute/relative path mismatch" main/err &&
test_cmp expect-gitdir main/.git/worktrees/side/gitdir &&
test_cmp expect-gitfile sidemoved/.git
test_cmp expect-gitfile side/.git
'

test_expect_success 'repair absolute to relative from main worktree' '
test_when_finished "rm -rf main side" &&
test_create_repo main &&
git -C main config worktree.useRelativePaths false &&
test_commit -C main init &&
git -C main worktree add --detach ../side &&
echo "../../../../side/.git" >expect-gitdir &&
echo "gitdir: ../main/.git/worktrees/side" >expect-gitfile &&
git -C main config worktree.useRelativePaths true &&
git -C main worktree repair 2>main/err &&
test_grep ".git file absolute/relative path mismatch" main/err &&
test_cmp expect-gitdir main/.git/worktrees/side/gitdir &&
test_cmp expect-gitfile side/.git
'

test_expect_success 'repair relative to absolute from main worktree' '
test_when_finished "rm -rf main side" &&
test_create_repo main &&
git -C main config worktree.useRelativePaths true &&
test_commit -C main init &&
git -C main worktree add --detach ../side &&
echo "$(pwd)/side/.git" >expect-gitdir &&
echo "gitdir: $(pwd)/main/.git/worktrees/side" >expect-gitfile &&
git -C main config worktree.useRelativePaths false &&
git -C main worktree repair 2>main/err &&
test_grep ".git file absolute/relative path mismatch" main/err &&
test_cmp expect-gitdir main/.git/worktrees/side/gitdir &&
test_cmp expect-gitfile side/.git
'

test_done
13 changes: 3 additions & 10 deletions worktree.c
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Original file line number Diff line number Diff line change
Expand Up @@ -667,7 +667,7 @@ static void repair_gitfile(struct worktree *wt,
strbuf_realpath(&repo, path, 1);
strbuf_addf(&dotgit, "%s/.git", wt->path);
strbuf_addf(&gitdir, "%s/gitdir", repo.buf);
dotgit_contents = xstrdup_or_null(read_gitfile_gently(dotgit.buf, &err));
dotgit_contents = xstrdup_or_null(read_gitfile_raw(dotgit.buf, &err));

if (dotgit_contents) {
if (is_absolute_path(dotgit_contents)) {
Expand All @@ -681,7 +681,7 @@ static void repair_gitfile(struct worktree *wt,
if (err == READ_GITFILE_ERR_NOT_A_FILE ||
err == READ_GITFILE_ERR_IS_A_DIR)
fn(1, wt->path, _(".git is not a file"), cb_data);
else if (err)
else if (err || !is_git_directory(backlink.buf))
repair = _(".git file broken");
else if (fspathcmp(backlink.buf, repo.buf))
repair = _(".git file incorrect");
Expand Down Expand Up @@ -857,14 +857,7 @@ void repair_worktree_at_path(struct repository *repo,
strbuf_realpath_forgiving(&inferred_backlink, inferred_backlink.buf, 0);
dotgit_contents = xstrdup_or_null(read_gitfile_gently(dotgit.buf, &err));
if (dotgit_contents) {
if (is_absolute_path(dotgit_contents)) {
strbuf_addstr(&backlink, dotgit_contents);
} else {
strbuf_addbuf(&backlink, &dotgit);
strbuf_strip_suffix(&backlink, ".git");
strbuf_addstr(&backlink, dotgit_contents);
strbuf_realpath_forgiving(&backlink, backlink.buf, 0);
}
strbuf_addstr(&backlink, dotgit_contents);
} else if (err == READ_GITFILE_ERR_NOT_A_FILE ||
err == READ_GITFILE_ERR_IS_A_DIR) {
fn(1, dotgit.buf, _("unable to locate repository; .git is not a file"), cb_data);
Expand Down
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