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-rw-r--r--Documentation/git-worktree.txt15
-rw-r--r--refs.c21
-rw-r--r--refs.h8
-rw-r--r--refs/files-backend.c28
-rwxr-xr-xt/t1415-worktree-refs.sh46
-rw-r--r--worktree.c30
-rw-r--r--worktree.h9
7 files changed, 153 insertions, 4 deletions
diff --git a/Documentation/git-worktree.txt b/Documentation/git-worktree.txt
index a50fbf8..9117e4f 100644
--- a/Documentation/git-worktree.txt
+++ b/Documentation/git-worktree.txt
@@ -208,7 +208,8 @@ REFS
----
In multiple working trees, some refs may be shared between all working
trees, some refs are local. One example is HEAD is different for all
-working trees. This section is about the sharing rules.
+working trees. This section is about the sharing rules and how to access
+refs of one working tree from another.
In general, all pseudo refs are per working tree and all refs starting
with "refs/" are shared. Pseudo refs are ones like HEAD which are
@@ -216,6 +217,18 @@ directly under GIT_DIR instead of inside GIT_DIR/refs. There are one
exception to this: refs inside refs/bisect and refs/worktree is not
shared.
+Refs that are per working tree can still be accessed from another
+working tree via two special paths, main-worktree and worktrees. The
+former gives access to per-worktree refs of the main working tree,
+while the latter to all linked working trees.
+
+For example, main-worktree/HEAD or main-worktree/refs/bisect/good
+resolve to the same value as the main working tree's HEAD and
+refs/bisect/good respectively. Similarly, worktrees/foo/HEAD or
+worktrees/bar/refs/bisect/bad are the same as
+GIT_COMMON_DIR/worktrees/foo/HEAD and
+GIT_COMMON_DIR/worktrees/bar/refs/bisect/bad.
+
To access refs, it's best not to look inside GIT_DIR directly. Instead
use commands such as linkgit:git-revparse[1] or linkgit:git-update-ref[1]
which will handle refs correctly.
diff --git a/refs.c b/refs.c
index 1bc4ed3..2378b2e 100644
--- a/refs.c
+++ b/refs.c
@@ -641,12 +641,33 @@ static int is_pseudoref_syntax(const char *refname)
return 1;
}
+static int is_main_pseudoref_syntax(const char *refname)
+{
+ return skip_prefix(refname, "main-worktree/", &refname) &&
+ *refname &&
+ is_pseudoref_syntax(refname);
+}
+
+static int is_other_pseudoref_syntax(const char *refname)
+{
+ if (!skip_prefix(refname, "worktrees/", &refname))
+ return 0;
+ refname = strchr(refname, '/');
+ if (!refname || !refname[1])
+ return 0;
+ return is_pseudoref_syntax(refname + 1);
+}
+
enum ref_type ref_type(const char *refname)
{
if (is_per_worktree_ref(refname))
return REF_TYPE_PER_WORKTREE;
if (is_pseudoref_syntax(refname))
return REF_TYPE_PSEUDOREF;
+ if (is_main_pseudoref_syntax(refname))
+ return REF_TYPE_MAIN_PSEUDOREF;
+ if (is_other_pseudoref_syntax(refname))
+ return REF_TYPE_OTHER_PSEUDOREF;
return REF_TYPE_NORMAL;
}
diff --git a/refs.h b/refs.h
index bd52c1b..9b53dbe 100644
--- a/refs.h
+++ b/refs.h
@@ -704,9 +704,11 @@ int parse_hide_refs_config(const char *var, const char *value, const char *);
int ref_is_hidden(const char *, const char *);
enum ref_type {
- REF_TYPE_PER_WORKTREE,
- REF_TYPE_PSEUDOREF,
- REF_TYPE_NORMAL,
+ REF_TYPE_PER_WORKTREE, /* refs inside refs/ but not shared */
+ REF_TYPE_PSEUDOREF, /* refs outside refs/ in current worktree */
+ REF_TYPE_MAIN_PSEUDOREF, /* pseudo refs from the main worktree */
+ REF_TYPE_OTHER_PSEUDOREF, /* pseudo refs from other worktrees */
+ REF_TYPE_NORMAL, /* normal/shared refs inside refs/ */
};
enum ref_type ref_type(const char *refname);
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 2dd77f9..9183875 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -10,6 +10,7 @@
#include "../object.h"
#include "../dir.h"
#include "../chdir-notify.h"
+#include "worktree.h"
/*
* This backend uses the following flags in `ref_update::flags` for
@@ -149,6 +150,25 @@ static struct files_ref_store *files_downcast(struct ref_store *ref_store,
return refs;
}
+static void files_reflog_path_other_worktrees(struct files_ref_store *refs,
+ struct strbuf *sb,
+ const char *refname)
+{
+ const char *real_ref;
+ const char *worktree_name;
+ int length;
+
+ if (parse_worktree_ref(refname, &worktree_name, &length, &real_ref))
+ BUG("refname %s is not a other-worktree ref", refname);
+
+ if (worktree_name)
+ strbuf_addf(sb, "%s/worktrees/%.*s/logs/%s", refs->gitcommondir,
+ length, worktree_name, real_ref);
+ else
+ strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir,
+ real_ref);
+}
+
static void files_reflog_path(struct files_ref_store *refs,
struct strbuf *sb,
const char *refname)
@@ -158,6 +178,9 @@ static void files_reflog_path(struct files_ref_store *refs,
case REF_TYPE_PSEUDOREF:
strbuf_addf(sb, "%s/logs/%s", refs->gitdir, refname);
break;
+ case REF_TYPE_OTHER_PSEUDOREF:
+ case REF_TYPE_MAIN_PSEUDOREF:
+ return files_reflog_path_other_worktrees(refs, sb, refname);
case REF_TYPE_NORMAL:
strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, refname);
break;
@@ -176,6 +199,11 @@ static void files_ref_path(struct files_ref_store *refs,
case REF_TYPE_PSEUDOREF:
strbuf_addf(sb, "%s/%s", refs->gitdir, refname);
break;
+ case REF_TYPE_MAIN_PSEUDOREF:
+ if (!skip_prefix(refname, "main-worktree/", &refname))
+ BUG("ref %s is not a main pseudoref", refname);
+ /* fallthrough */
+ case REF_TYPE_OTHER_PSEUDOREF:
case REF_TYPE_NORMAL:
strbuf_addf(sb, "%s/%s", refs->gitcommondir, refname);
break;
diff --git a/t/t1415-worktree-refs.sh b/t/t1415-worktree-refs.sh
index 16c91be..b664e51 100755
--- a/t/t1415-worktree-refs.sh
+++ b/t/t1415-worktree-refs.sh
@@ -30,4 +30,50 @@ test_expect_success 'refs/worktree are per-worktree' '
( cd wt2 && test_cmp_rev worktree/foo wt2 )
'
+test_expect_success 'resolve main-worktree/HEAD' '
+ test_cmp_rev main-worktree/HEAD initial &&
+ ( cd wt1 && test_cmp_rev main-worktree/HEAD initial ) &&
+ ( cd wt2 && test_cmp_rev main-worktree/HEAD initial )
+'
+
+test_expect_success 'ambiguous main-worktree/HEAD' '
+ mkdir -p .git/refs/heads/main-worktree &&
+ test_when_finished rm -f .git/refs/heads/main-worktree/HEAD &&
+ cp .git/HEAD .git/refs/heads/main-worktree/HEAD &&
+ git rev-parse main-worktree/HEAD 2>warn &&
+ grep "main-worktree/HEAD.*ambiguous" warn
+'
+
+test_expect_success 'resolve worktrees/xx/HEAD' '
+ test_cmp_rev worktrees/wt1/HEAD wt1 &&
+ ( cd wt1 && test_cmp_rev worktrees/wt1/HEAD wt1 ) &&
+ ( cd wt2 && test_cmp_rev worktrees/wt1/HEAD wt1 )
+'
+
+test_expect_success 'ambiguous worktrees/xx/HEAD' '
+ mkdir -p .git/refs/heads/worktrees/wt1 &&
+ test_when_finished rm -f .git/refs/heads/worktrees/wt1/HEAD &&
+ cp .git/HEAD .git/refs/heads/worktrees/wt1/HEAD &&
+ git rev-parse worktrees/wt1/HEAD 2>warn &&
+ grep "worktrees/wt1/HEAD.*ambiguous" warn
+'
+
+test_expect_success 'reflog of main-worktree/HEAD' '
+ git reflog HEAD | sed "s/HEAD/main-worktree\/HEAD/" >expected &&
+ git reflog main-worktree/HEAD >actual &&
+ test_cmp expected actual &&
+ git -C wt1 reflog main-worktree/HEAD >actual.wt1 &&
+ test_cmp expected actual.wt1
+'
+
+test_expect_success 'reflog of worktrees/xx/HEAD' '
+ git -C wt2 reflog HEAD | sed "s/HEAD/worktrees\/wt2\/HEAD/" >expected &&
+ git reflog worktrees/wt2/HEAD >actual &&
+ test_cmp expected actual &&
+ git -C wt1 reflog worktrees/wt2/HEAD >actual.wt1 &&
+ test_cmp expected actual.wt1 &&
+ git -C wt2 reflog worktrees/wt2/HEAD >actual.wt2 &&
+ test_cmp expected actual.wt2
+'
+
test_done
diff --git a/worktree.c b/worktree.c
index b0d0b54..4193496 100644
--- a/worktree.c
+++ b/worktree.c
@@ -487,6 +487,36 @@ int submodule_uses_worktrees(const char *path)
return ret;
}
+int parse_worktree_ref(const char *worktree_ref, const char **name,
+ int *name_length, const char **ref)
+{
+ if (skip_prefix(worktree_ref, "main-worktree/", &worktree_ref)) {
+ if (!*worktree_ref)
+ return -1;
+ if (name)
+ *name = NULL;
+ if (name_length)
+ *name_length = 0;
+ if (ref)
+ *ref = worktree_ref;
+ return 0;
+ }
+ if (skip_prefix(worktree_ref, "worktrees/", &worktree_ref)) {
+ const char *slash = strchr(worktree_ref, '/');
+
+ if (!slash || slash == worktree_ref || !slash[1])
+ return -1;
+ if (name)
+ *name = worktree_ref;
+ if (name_length)
+ *name_length = slash - worktree_ref;
+ if (ref)
+ *ref = slash + 1;
+ return 0;
+ }
+ return -1;
+}
+
int other_head_refs(each_ref_fn fn, void *cb_data)
{
struct worktree **worktrees, **p;
diff --git a/worktree.h b/worktree.h
index df3fc30..440bb21 100644
--- a/worktree.h
+++ b/worktree.h
@@ -108,4 +108,13 @@ extern const char *worktree_git_path(const struct worktree *wt,
const char *fmt, ...)
__attribute__((format (printf, 2, 3)));
+/*
+ * Parse a worktree ref (i.e. with prefix main-worktree/ or
+ * worktrees/) and return the position of the worktree's name and
+ * length (or NULL and zero if it's main worktree), and ref.
+ *
+ * All name, name_length and ref arguments could be NULL.
+ */
+int parse_worktree_ref(const char *worktree_ref, const char **name,
+ int *name_length, const char **ref);
#endif