This commit imitates the strategy that was used to convert the
difftool to a builtin. We start by renaming the shell script
`git-rebase.sh` to `git-legacy-rebase.sh` and introduce a
`builtin/rebase.c` that simply executes the shell script version,
unless the config setting `rebase.useBuiltin` is set to `true`.
The motivation behind this is to rewrite all the functionality of the
shell script version in the aforementioned `rebase.c`, one by one and
be able to conveniently test new features by configuring
`rebase.useBuiltin`.
In the original difftool conversion, if sane_execvp() that attempts to
run the legacy scripted version returned with non-negative status, the
command silently exited without doing anything with success, but
sane_execvp() should not return with non-negative status in the first
place, so we use die() to notice such an abnormal case.
We intentionally avoid reading the config directly to avoid
messing up the GIT_* environment variables when we need to fall back to
exec()ing the shell script. The test of builtin rebase can be done by
`git -c rebase.useBuiltin=true rebase ...`
Signed-off-by: Pratik Karki <predatoramigo@xxxxxxxxx>
---
.gitignore | 1 +
Makefile | 3 +-
builtin.h | 1 +
builtin/rebase.c | 58 +++++++++++++++++++++++++++
git-rebase.sh => git-legacy-rebase.sh | 0
git.c | 6 +++
6 files changed, 68 insertions(+), 1 deletion(-)
create mode 100644 builtin/rebase.c
rename git-rebase.sh => git-legacy-rebase.sh (100%)
diff --git a/.gitignore b/.gitignore
index 3284a1e9b1..ec23959014 100644
--- a/.gitignore
+++ b/.gitignore
@@ -78,6 +78,7 @@
/git-init-db
/git-interpret-trailers
/git-instaweb
+/git-legacy-rebase
/git-log
/git-ls-files
/git-ls-remote
diff --git a/Makefile b/Makefile
index 08e5c54549..a0c410b7d6 100644
--- a/Makefile
+++ b/Makefile
@@ -609,7 +609,7 @@ SCRIPT_SH += git-merge-one-file.sh
SCRIPT_SH += git-merge-resolve.sh
SCRIPT_SH += git-mergetool.sh
SCRIPT_SH += git-quiltimport.sh
-SCRIPT_SH += git-rebase.sh
+SCRIPT_SH += git-legacy-rebase.sh
SCRIPT_SH += git-remote-testgit.sh
SCRIPT_SH += git-request-pull.sh
SCRIPT_SH += git-stash.sh
@@ -1059,6 +1059,7 @@ BUILTIN_OBJS += builtin/prune.o
BUILTIN_OBJS += builtin/pull.o
BUILTIN_OBJS += builtin/push.o
BUILTIN_OBJS += builtin/read-tree.o
+BUILTIN_OBJS += builtin/rebase.o
BUILTIN_OBJS += builtin/rebase--helper.o
BUILTIN_OBJS += builtin/receive-pack.o
BUILTIN_OBJS += builtin/reflog.o
diff --git a/builtin.h b/builtin.h
index 0362f1ce25..44651a447f 100644
--- a/builtin.h
+++ b/builtin.h
@@ -202,6 +202,7 @@ extern int cmd_prune_packed(int argc, const char **argv, const char *prefix);
extern int cmd_pull(int argc, const char **argv, const char *prefix);
extern int cmd_push(int argc, const char **argv, const char *prefix);
extern int cmd_read_tree(int argc, const char **argv, const char *prefix);
+extern int cmd_rebase(int argc, const char **argv, const char *prefix);
extern int cmd_rebase__helper(int argc, const char **argv, const char *prefix);
extern int cmd_receive_pack(int argc, const char **argv, const char *prefix);
extern int cmd_reflog(int argc, const char **argv, const char *prefix);
diff --git a/builtin/rebase.c b/builtin/rebase.c
new file mode 100644
index 0000000000..c44addb2a4
--- /dev/null
+++ b/builtin/rebase.c
@@ -0,0 +1,58 @@
+/*
+ * "git rebase" builtin command
+ *
+ * Copyright (c) 2018 Pratik Karki
+ */
+
+#include "builtin.h"
+#include "run-command.h"
+#include "exec-cmd.h"
+#include "argv-array.h"
+#include "dir.h"
+
+static int use_builtin_rebase(void)
+{
+ struct child_process cp = CHILD_PROCESS_INIT;
+ struct strbuf out = STRBUF_INIT;
+ int ret;
+
+ argv_array_pushl(&cp.args,
+ "config", "--bool", "rebase.usebuiltin", NULL);
+ cp.git_cmd = 1;
+ if (capture_command(&cp, &out, 6)) {
+ strbuf_release(&out);
+ return 0;
+ }
+
+ strbuf_trim(&out);
+ ret = !strcmp("true", out.buf);
+ strbuf_release(&out);
+ return ret;
+}
+
+int cmd_rebase(int argc, const char **argv, const char *prefix)
+{
+ /*
+ * NEEDSWORK: Once the builtin rebase has been tested enough
+ * and git-legacy-rebase.sh is retired to contrib/, this preamble
+ * can be removed.
+ */
+
+ if (!use_builtin_rebase()) {
+ const char *path = mkpath("%s/git-legacy-rebase",
+ git_exec_path());
+
+ if (sane_execvp(path, (char **)argv) < 0)
+ die_errno(_("could not exec %s"), path);
+ else
+ BUG("sane_execvp() returned???");
+ }
+
+ if (argc != 2)
+ die(_("Usage: %s <base>"), argv[0]);
+ prefix = setup_git_directory();
+ trace_repo_setup(prefix);
+ setup_work_tree();
+
+ die("TODO");
+}
diff --git a/git-rebase.sh b/git-legacy-rebase.sh
similarity index 100%
rename from git-rebase.sh
rename to git-legacy-rebase.sh
diff --git a/git.c b/git.c
index 3fded74519..d28ad90e31 100644
--- a/git.c
+++ b/git.c
@@ -518,6 +518,12 @@ static struct cmd_struct commands[] = {
{ "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
{ "push", cmd_push, RUN_SETUP },
{ "read-tree", cmd_read_tree, RUN_SETUP | SUPPORT_SUPER_PREFIX},
+ /*
+ * NEEDSWORK: Until the rebase is independent and needs no redirection
+ * to rebase shell script this is kept as is, then should be changed to
+ * RUN_SETUP | NEED_WORK_TREE
+ */
+ { "rebase", cmd_rebase },
{ "rebase--helper", cmd_rebase__helper, RUN_SETUP | NEED_WORK_TREE },
{ "receive-pack", cmd_receive_pack },
{ "reflog", cmd_reflog, RUN_SETUP },
--
2.18.0
