# HG changeset patch
# User Simon Sapin <simon.sapin@octobus.net>
# Date 2021-10-12 15:57:57
# Node ID 4d5a13253d34a4c330e7e087e5ee12d249aab2b1
# Parent  1000db4a71f1d41afd621865e92bfba17a2dc0ea

dirstate-v2: Replace the 32-bit `mode` field with two bits

Previously we stored the entire value from `stat_result.st_mode`,
like dirstate-v1 does. However only the executable permission
and type of file (only symbolic links and normal files are supported)
are relevant to Mecurial.

So replace this field with two bits in the existing bitfield byte.
For now the unused space is left as padding, as it will be used
for something else soon.

Differential Revision: https://phab.mercurial-scm.org/D11635

diff --git a/mercurial/helptext/internals/dirstate-v2.txt b/mercurial/helptext/internals/dirstate-v2.txt
--- a/mercurial/helptext/internals/dirstate-v2.txt
+++ b/mercurial/helptext/internals/dirstate-v2.txt
@@ -380,6 +380,9 @@ Node components are:
     P2_INFO = 1 << 2
     HAS_MODE_AND_SIZE = 1 << 3
     HAS_MTIME = 1 << 4
+    MODE_EXEC_PERM = 1 << 5
+    MODE_IS_SYMLINK = 1 << 7
+
 
   Other bits are unset. The meaning of these bits are:
 
@@ -414,14 +417,17 @@ Node components are:
   in order to optimize `hg status`
   by enabling it to skip `readdir` in more cases.
 
-  When a node is for a file tracked anywhere,
-  the rest of the node data is three fields:
+  When a node is for a file tracked anywhere:
+  - If `HAS_MODE_AND_SIZE` is set, the file is expected
+    to be a symbolic link or a normal file based on `MODE_IS_SYMLINK`.
+  - If `HAS_MODE_AND_SIZE` is set, the file’s owner is expected
+    to have execute permission or not based on `MODE_EXEC_PERM`.
+  - If `HAS_MODE_AND_SIZE` is unset,
+    the expected type of file and permission are unknown.
+  The rest of the node data is three fields:
 
   * Offset 31:
-    If `HAS_MODE_AND_SIZE` is unset, four zero bytes.
-    Otherwise, a 32-bit integer for the Unix mode (as in `stat_result.st_mode`)
-    expected for this file to be considered clean.
-    Only the `S_IXUSR` bit (owner has execute permission) is considered.
+    4 unused bytes, set to zero
 
   * Offset 35:
     If `HAS_MODE_AND_SIZE` is unset, four zero bytes.
diff --git a/rust/Cargo.lock b/rust/Cargo.lock
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "adler"
 version = "0.2.3"
@@ -386,6 +388,7 @@ dependencies = [
  "im-rc",
  "itertools",
  "lazy_static",
+ "libc",
  "log",
  "memmap2",
  "micro-timer",
diff --git a/rust/hg-core/Cargo.toml b/rust/hg-core/Cargo.toml
--- a/rust/hg-core/Cargo.toml
+++ b/rust/hg-core/Cargo.toml
@@ -17,6 +17,7 @@ home = "0.5"
 im-rc = "15.0.*"
 itertools = "0.9"
 lazy_static = "1.4.0"
+libc = "0.2"
 rand = "0.7.3"
 rand_pcg = "0.2.1"
 rand_distr = "0.2.2"
diff --git a/rust/hg-core/src/dirstate_tree/on_disk.rs b/rust/hg-core/src/dirstate_tree/on_disk.rs
--- a/rust/hg-core/src/dirstate_tree/on_disk.rs
+++ b/rust/hg-core/src/dirstate_tree/on_disk.rs
@@ -107,13 +107,15 @@ bitflags! {
         const P2_INFO = 1 << 2;
         const HAS_MODE_AND_SIZE = 1 << 3;
         const HAS_MTIME = 1 << 4;
+        const MODE_EXEC_PERM = 1 << 5;
+        const MODE_IS_SYMLINK = 1 << 7;
     }
 }
 
 #[derive(BytesCast, Copy, Clone, Debug)]
 #[repr(C)]
 struct Entry {
-    mode: U32Be,
+    _padding: U32Be,
     size: U32Be,
     mtime: U32Be,
 }
@@ -332,13 +334,27 @@ impl Node {
         )
     }
 
+    fn synthesize_unix_mode(&self) -> u32 {
+        let file_type = if self.flags.contains(Flags::MODE_IS_SYMLINK) {
+            libc::S_IFLNK
+        } else {
+            libc::S_IFREG
+        };
+        let permisions = if self.flags.contains(Flags::MODE_EXEC_PERM) {
+            0o755
+        } else {
+            0o644
+        };
+        file_type | permisions
+    }
+
     fn assume_entry(&self) -> DirstateEntry {
         // TODO: convert through raw bits instead?
         let wdir_tracked = self.flags.contains(Flags::WDIR_TRACKED);
         let p1_tracked = self.flags.contains(Flags::P1_TRACKED);
         let p2_info = self.flags.contains(Flags::P2_INFO);
         let mode_size = if self.flags.contains(Flags::HAS_MODE_AND_SIZE) {
-            Some((self.data.mode.into(), self.data.size.into()))
+            Some((self.synthesize_unix_mode(), self.data.size.into()))
         } else {
             None
         };
@@ -400,13 +416,15 @@ impl Entry {
         flags.set(Flags::WDIR_TRACKED, wdir_tracked);
         flags.set(Flags::P1_TRACKED, p1_tracked);
         flags.set(Flags::P2_INFO, p2_info);
-        let (mode, size, mtime);
+        let (size, mtime);
         if let Some((m, s)) = mode_size_opt {
-            mode = m;
+            let exec_perm = m & libc::S_IXUSR != 0;
+            let is_symlink = m & libc::S_IFMT == libc::S_IFLNK;
+            flags.set(Flags::MODE_EXEC_PERM, exec_perm);
+            flags.set(Flags::MODE_IS_SYMLINK, is_symlink);
             size = s;
             flags.insert(Flags::HAS_MODE_AND_SIZE)
         } else {
-            mode = 0;
             size = 0;
         }
         if let Some(m) = mtime_opt {
@@ -416,7 +434,7 @@ impl Entry {
             mtime = 0;
         }
         let raw_entry = Entry {
-            mode: mode.into(),
+            _padding: 0.into(),
             size: size.into(),
             mtime: mtime.into(),
         };
@@ -600,7 +618,7 @@ impl Writer<'_, '_> {
                         dirstate_map::NodeData::None => (
                             Flags::empty(),
                             Entry {
-                                mode: 0.into(),
+                                _padding: 0.into(),
                                 size: 0.into(),
                                 mtime: 0.into(),
                             },
diff --git a/rust/hg-cpython/Cargo.toml b/rust/hg-cpython/Cargo.toml
--- a/rust/hg-cpython/Cargo.toml
+++ b/rust/hg-cpython/Cargo.toml
@@ -23,7 +23,7 @@ python3-bin = ["cpython/python3-sys"]
 [dependencies]
 crossbeam-channel = "0.4"
 hg-core = { path = "../hg-core"}
-libc = '*'
+libc = "0.2"
 log = "0.4.8"
 env_logger = "0.7.1"
 stable_deref_trait = "1.2.0"