mailinfo: do not let handle_boundary() touch global "line" directly

diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index 3d79a46b036fa7bea29bbc0941442b5dd92f648c..7f30d3a76f69e58ae3cdbbe05c5ebdce6c8a120d 100644 (file)
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -14,6 +14,7 @@ static const char * const git_update_ref_usage[] = {
 
 static char line_termination = '\n';
 static int update_flags;
+static unsigned create_reflog_flag;
 static const char *msg;
 
 /*
@@ -200,7 +201,8 @@ static const char *parse_cmd_update(struct ref_transaction *transaction,
 
        if (ref_transaction_update(transaction, refname,
                                   new_sha1, have_old ? old_sha1 : NULL,
-                                  update_flags, msg, &err))
+                                  update_flags | create_reflog_flag,
+                                  msg, &err))
                die("%s", err.buf);
 
        update_flags = 0;
@@ -231,7 +233,8 @@ static const char *parse_cmd_create(struct ref_transaction *transaction,
                die("create %s: extra input: %s", refname, next);
 
        if (ref_transaction_create(transaction, refname, new_sha1,
-                                  update_flags, msg, &err))
+                                  update_flags | create_reflog_flag,
+                                  msg, &err))
                die("%s", err.buf);
 
        update_flags = 0;
@@ -354,6 +357,7 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
        unsigned char sha1[20], oldsha1[20];
        int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0;
        unsigned int flags = 0;
+       int create_reflog = 0;
        struct option options[] = {
                OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")),
                OPT_BOOL('d', NULL, &delete, N_("delete the reference")),
@@ -361,6 +365,7 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
                                        N_("update <refname> not the one it points to")),
                OPT_BOOL('z', NULL, &end_null, N_("stdin has NUL-terminated arguments")),
                OPT_BOOL( 0 , "stdin", &read_stdin, N_("read updates from stdin")),
+               OPT_BOOL( 0 , "create-reflog", &create_reflog, N_("create a reflog")),
                OPT_END(),
        };
 
@@ -370,6 +375,8 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
        if (msg && !*msg)
                die("Refusing to perform update with empty message.");
 
+       create_reflog_flag = create_reflog ? REF_FORCE_CREATE_REFLOG : 0;
+
        if (read_stdin) {
                struct strbuf err = STRBUF_INIT;
                struct ref_transaction *transaction;
@@ -408,15 +415,29 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
                        die("%s: not a valid SHA1", value);
        }
 
-       hashclr(oldsha1); /* all-zero hash in case oldval is the empty string */
-       if (oldval && *oldval && get_sha1(oldval, oldsha1))
-               die("%s: not a valid old SHA1", oldval);
+       if (oldval) {
+               if (!*oldval)
+                       /*
+                        * The empty string implies that the reference
+                        * must not already exist:
+                        */
+                       hashclr(oldsha1);
+               else if (get_sha1(oldval, oldsha1))
+                       die("%s: not a valid old SHA1", oldval);
+       }
 
        if (no_deref)
                flags = REF_NODEREF;
        if (delete)
-               return delete_ref(refname, oldval ? oldsha1 : NULL, flags);
+               /*
+                * For purposes of backwards compatibility, we treat
+                * NULL_SHA1 as "don't care" here:
+                */
+               return delete_ref(refname,
+                                 (oldval && !is_null_sha1(oldsha1)) ? oldsha1 : NULL,
+                                 flags);
        else
                return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
-                                 flags, UPDATE_REFS_DIE_ON_ERR);
+                                 flags | create_reflog_flag,
+                                 UPDATE_REFS_DIE_ON_ERR);
 }