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-rw-r--r--erts/doc/src/erl_prim_loader.xml16
-rw-r--r--erts/preloaded/src/erl_prim_loader.erl38
-rw-r--r--lib/kernel/src/erl_boot_server.erl6
-rw-r--r--lib/stdlib/src/filelib.erl14
-rw-r--r--lib/stdlib/test/filelib_SUITE.erl25
5 files changed, 85 insertions, 14 deletions
diff --git a/erts/doc/src/erl_prim_loader.xml b/erts/doc/src/erl_prim_loader.xml
index 6751deda4d..171f84decc 100644
--- a/erts/doc/src/erl_prim_loader.xml
+++ b/erts/doc/src/erl_prim_loader.xml
@@ -148,6 +148,22 @@
</desc>
</func>
<func>
+ <name name="read_link_info" arity="1"/>
+ <fsummary>Get information about a link or file</fsummary>
+ <desc>
+ <p>This function works like
+ <seealso marker="#read_file_info/1">read_file_info/1</seealso>
+ except that if <c><anno>Filename</anno></c> is a symbolic link,
+ information about the link will be returned in the <c>file_info</c>
+ record and the <c>type</c> field of the record will be set to
+ <c>symlink</c>.</p>
+ <p>If <c><anno>Filename</anno></c> is not a symbolic link, this function
+ returns exactly the same result as <c>read_file_info/1</c>.
+ On platforms that do not support symbolic links, this function
+ is always equivalent to <c>read_file_info/1</c>.</p>
+ </desc>
+ </func>
+ <func>
<name name="set_path" arity="1"/>
<fsummary>Set the path of the loader</fsummary>
<desc>
diff --git a/erts/preloaded/src/erl_prim_loader.erl b/erts/preloaded/src/erl_prim_loader.erl
index 578913b633..466e0b0020 100644
--- a/erts/preloaded/src/erl_prim_loader.erl
+++ b/erts/preloaded/src/erl_prim_loader.erl
@@ -42,11 +42,11 @@
%% Public
-export([start/3, set_path/1, get_path/0, get_file/1, get_files/2,
- list_dir/1, read_file_info/1, get_cwd/0, get_cwd/1]).
+ list_dir/1, read_file_info/1, read_link_info/1, get_cwd/0, get_cwd/1]).
%% Used by erl_boot_server
-export([prim_init/0, prim_get_file/2, prim_list_dir/2,
- prim_read_file_info/2, prim_get_cwd/2]).
+ prim_read_file_info/3, prim_get_cwd/2]).
%% Used by escript and code
-export([set_primary_archive/4, release_archives/0]).
@@ -223,6 +223,12 @@ list_dir(Dir) ->
read_file_info(File) ->
check_file_result(read_file_info, File, request({read_file_info,File})).
+-spec read_link_info(Filename) -> {'ok', FileInfo} | 'error' when
+ Filename :: string(),
+ FileInfo :: file:file_info().
+read_link_info(File) ->
+ check_file_result(read_link_info, File, request({read_link_info,File})).
+
-spec get_cwd() -> {'ok', string()} | 'error'.
get_cwd() ->
check_file_result(get_cwd, [], request({get_cwd,[]})).
@@ -325,6 +331,9 @@ loop(State, Parent, Paths) ->
{read_file_info,File} ->
{Res,State1} = handle_read_file_info(State, File),
{Res,State1,Paths};
+ {read_link_info,File} ->
+ {Res,State1} = handle_read_link_info(State, File),
+ {Res,State1,Paths};
{get_cwd,[]} ->
{Res,State1} = handle_get_cwd(State, []),
{Res,State1,Paths};
@@ -387,10 +396,15 @@ handle_list_dir(State = #state{loader = inet}, Dir) ->
?SAFE2(inet_list_dir(State, Dir), State).
handle_read_file_info(State = #state{loader = efile}, File) ->
- ?SAFE2(efile_read_file_info(State, File), State);
+ ?SAFE2(efile_read_file_info(State, File, true), State);
handle_read_file_info(State = #state{loader = inet}, File) ->
?SAFE2(inet_read_file_info(State, File), State).
+handle_read_link_info(State = #state{loader = efile}, File) ->
+ ?SAFE2(efile_read_file_info(State, File, false), State);
+handle_read_link_info(State = #state{loader = inet}, File) ->
+ ?SAFE2(inet_read_link_info(State, File), State).
+
handle_get_cwd(State = #state{loader = efile}, Drive) ->
?SAFE2(efile_get_cwd(State, Drive), State);
handle_get_cwd(State = #state{loader = inet}, Drive) ->
@@ -514,8 +528,8 @@ efile_list_dir(#state{prim_state = PS} = State, Dir) ->
{Res, PS2} = prim_list_dir(PS, Dir),
{Res, State#state{prim_state = PS2}}.
-efile_read_file_info(#state{prim_state = PS} = State, File) ->
- {Res, PS2} = prim_read_file_info(PS, File),
+efile_read_file_info(#state{prim_state = PS} = State, File, FollowLinks) ->
+ {Res, PS2} = prim_read_file_info(PS, File, FollowLinks),
{Res, State#state{prim_state = PS2}}.
efile_get_cwd(#state{prim_state = PS} = State, Drive) ->
@@ -718,6 +732,10 @@ inet_list_dir(State, Dir) ->
inet_read_file_info(State, File) ->
inet_send_and_rcv({read_file_info,File}, read_file_info, State).
+%% -> {{ok,Info},State} | {{error,Reason},State}
+inet_read_link_info(State, File) ->
+ inet_send_and_rcv({read_link_info,File}, read_link_info, State).
+
%% -> {{ok,Cwd},State} | {{error,Reason},State}
inet_get_cwd(State, []) ->
inet_send_and_rcv(get_cwd, get_cwd, State);
@@ -951,16 +969,18 @@ prim_list_dir(PS, Dir) ->
debug(PS, {return, Res2}),
{Res2, PS3}.
--spec prim_read_file_info(prim_state(), file:filename()) ->
+-spec prim_read_file_info(prim_state(), file:filename(), boolean()) ->
{{'ok', #file_info{}}, prim_state()}
| {{'error', term()}, prim_state()}.
-prim_read_file_info(PS, File) ->
+prim_read_file_info(PS, File, FollowLinks) ->
debug(PS, {read_file_info, File}),
{Res2, PS2} =
case name_split(PS#prim_state.primary_archive, File) of
{file, PrimFile} ->
- Res = prim_file:read_file_info(PrimFile),
- {Res, PS};
+ case FollowLinks of
+ true -> {prim_file:read_file_info(PrimFile), PS};
+ false -> {prim_file:read_link_info(PrimFile), PS}
+ end;
{archive, ArchiveFile, []} ->
%% Fake top directory
debug(PS, {archive_read_file_info, ArchiveFile}),
diff --git a/lib/kernel/src/erl_boot_server.erl b/lib/kernel/src/erl_boot_server.erl
index 9a49655a9f..ef09d86ca4 100644
--- a/lib/kernel/src/erl_boot_server.erl
+++ b/lib/kernel/src/erl_boot_server.erl
@@ -341,9 +341,13 @@ handle_command(S, PS, Msg) ->
send_file_result(S, list_dir, Res),
PS2;
{read_file_info,File} ->
- {Res, PS2} = erl_prim_loader:prim_read_file_info(PS, File),
+ {Res, PS2} = erl_prim_loader:prim_read_file_info(PS, File, true),
send_file_result(S, read_file_info, Res),
PS2;
+ {read_link_info,File} ->
+ {Res, PS2} = erl_prim_loader:prim_read_file_info(PS, File, false),
+ send_file_result(S, read_link_info, Res),
+ PS2;
get_cwd ->
{Res, PS2} = erl_prim_loader:prim_get_cwd(PS, []),
send_file_result(S, get_cwd, Res),
diff --git a/lib/stdlib/src/filelib.erl b/lib/stdlib/src/filelib.erl
index c0921e4cf1..9efbe8da20 100644
--- a/lib/stdlib/src/filelib.erl
+++ b/lib/stdlib/src/filelib.erl
@@ -265,7 +265,7 @@ do_wildcard(Pattern, Cwd, Mod) ->
lists:sort(Files).
do_wildcard_1({exists,File}, Mod) ->
- case eval_read_file_info(File, Mod) of
+ case eval_read_link_info(File, Mod) of
{ok,_} -> [File];
_ -> []
end;
@@ -488,7 +488,7 @@ badpattern(Reason) ->
error({badpattern,Reason}).
eval_read_file_info(File, file) ->
- file:read_link_info(File);
+ file:read_file_info(File);
eval_read_file_info(File, erl_prim_loader) ->
case erl_prim_loader:read_file_info(File) of
error -> {error, erl_prim_loader};
@@ -497,6 +497,16 @@ eval_read_file_info(File, erl_prim_loader) ->
eval_read_file_info(File, Mod) ->
Mod:read_file_info(File).
+eval_read_link_info(File, file) ->
+ file:read_link_info(File);
+eval_read_link_info(File, erl_prim_loader) ->
+ case erl_prim_loader:read_link_info(File) of
+ error -> {error, erl_prim_loader};
+ Res-> Res
+ end;
+eval_read_link_info(File, Mod) ->
+ Mod:read_link_info(File).
+
eval_list_dir(Dir, file) ->
file:list_dir(Dir);
eval_list_dir(Dir, erl_prim_loader) ->
diff --git a/lib/stdlib/test/filelib_SUITE.erl b/lib/stdlib/test/filelib_SUITE.erl
index 8203a03a7a..f1a072194a 100644
--- a/lib/stdlib/test/filelib_SUITE.erl
+++ b/lib/stdlib/test/filelib_SUITE.erl
@@ -23,7 +23,8 @@
init_per_group/2,end_per_group/2,
init_per_testcase/2,end_per_testcase/2,
wildcard_one/1,wildcard_two/1,wildcard_errors/1,
- fold_files/1,otp_5960/1,ensure_dir_eexist/1,symlinks/1]).
+ fold_files/1,otp_5960/1,ensure_dir_eexist/1,ensure_dir_symlink/1,
+ symlinks/1]).
-import(lists, [foreach/2]).
@@ -43,7 +44,7 @@ suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[wildcard_one, wildcard_two, wildcard_errors,
- fold_files, otp_5960, ensure_dir_eexist, symlinks].
+ fold_files, otp_5960, ensure_dir_eexist, ensure_dir_symlink, symlinks].
groups() ->
[].
@@ -367,6 +368,26 @@ ensure_dir_eexist(Config) when is_list(Config) ->
?line {error, eexist} = filelib:ensure_dir(NeedFileB),
ok.
+ensure_dir_symlink(Config) when is_list(Config) ->
+ PrivDir = ?config(priv_dir, Config),
+ Dir = filename:join(PrivDir, "ensure_dir_symlink"),
+ Name = filename:join(Dir, "same_name_as_file_and_dir"),
+ ok = filelib:ensure_dir(Name),
+ ok = file:write_file(Name, <<"some string\n">>),
+ %% With a symlink to the directory.
+ Symlink = filename:join(PrivDir, "ensure_dir_symlink_link"),
+ case file:make_symlink(Dir, Symlink) of
+ {error,enotsup} ->
+ {skip,"Symlinks not supported on this platform"};
+ {error,eperm} ->
+ {win32,_} = os:type(),
+ {skip,"Windows user not privileged to create symlinks"};
+ ok ->
+ SymlinkedName = filename:join(Symlink, "same_name_as_file_and_dir"),
+ ok = filelib:ensure_dir(SymlinkedName)
+ end.
+
+
symlinks(Config) when is_list(Config) ->
PrivDir = ?config(priv_dir, Config),
Dir = filename:join(PrivDir, ?MODULE_STRING++"_symlinks"),
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 16:22:06 +0000