Add glossary entries for both concepts.
Pseudorefs and per-worktree refs do not yet have special handling,
because the files refs backend already handles them correctly. Later,
we will make the LMDB backend call out to the files backend to handle
per-worktree refs.
Signed-off-by: David Turner <dtur...@twopensource.com>
---
Documentation/glossary-content.txt | 21 +++++++++++++++++++++
refs.c | 23 +++++++++++++++++++++++
refs.h | 2 ++
3 files changed, 46 insertions(+)
diff --git a/Documentation/glossary-content.txt
b/Documentation/glossary-content.txt
index ab18f4b..67952f3 100644
--- a/Documentation/glossary-content.txt
+++ b/Documentation/glossary-content.txt
@@ -411,6 +411,27 @@ exclude;;
core Git. Porcelains expose more of a <<def_SCM,SCM>>
interface than the <<def_plumbing,plumbing>>.
+[[def_per_worktree_ref]]per-worktree ref::
+ Refs that are per-<<def_worktree,worktree>>, rather than
+ global. This is presently only <<def_HEAD,HEAD>>, but might
+ later include other unusual refs.
+
+[[def_pseudoref]]pseudoref::
+ Pseudorefs are a class of files under `$GIT_DIR` which behave
+ like refs for the purposes of rev-parse, but which are treated
+ specially by git. Psuedorefs both have names are all-caps,
+ and always start with a line consisting of a
+ <<def_sha1,SHA-1>> followed by whitespace. So, HEAD is not a
+ pseudoref, because it is sometimes a symbolic ref. They might
+ optionally some additional data. `MERGE_HEAD` and
+ `CHERRY_PICK_HEAD` are examples. Unlike
+ <<def_per_worktree_ref,per-worktree refs>>, these files cannot
+ be symbolic refs, and never have reflogs. They also cannot be
+ updated through the normal ref update machinery. Instead,
+ they are updated by directly writing to the files. However,
+ they can be read as if they were refs, so `git rev-parse
+ MERGE_HEAD` will work.
+
[[def_pull]]pull::
Pulling a <<def_branch,branch>> means to <<def_fetch,fetch>> it and
<<def_merge,merge>> it. See also linkgit:git-pull[1].
diff --git a/refs.c b/refs.c
index 0b96ece..0d10b7b 100644
--- a/refs.c
+++ b/refs.c
@@ -2848,6 +2848,29 @@ static int delete_ref_loose(struct ref_lock *lock, int
flag, struct strbuf *err)
return 0;
}
+int is_per_worktree_ref(const char *refname)
+{
+ return !strcmp(refname, "HEAD");
+}
+
+static int is_pseudoref(const char *refname)
+{
+ const char *c;
+
+ if (strchr(refname, '/'))
+ return 0;
+
+ if (is_per_worktree_ref(refname))
+ return 0;
+
+ for (c = refname; *c; ++c) {
+ if (!isupper(*c) && *c != '-' && *c != '_')
+ return 0;
+ }
+
+ return 1;
+}
+
int delete_ref(const char *refname, const unsigned char *old_sha1,
unsigned int flags)
{
diff --git a/refs.h b/refs.h
index e4e46c3..bd5526e 100644
--- a/refs.h
+++ b/refs.h
@@ -445,6 +445,8 @@ extern int parse_hide_refs_config(const char *var, const
char *value, const char
extern int ref_is_hidden(const char *);
+int is_per_worktree_ref(const char *refname);
+
enum expire_reflog_flags {
EXPIRE_REFLOGS_DRY_RUN = 1 << 0,
EXPIRE_REFLOGS_UPDATE_REF = 1 << 1,
--
2.0.4.315.gad8727a-twtrsrc
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