[PATCH v7 03/45] builtin-am: implement skeletal builtin am
From: Paul Tan <hidden>
Date: 2016-06-15 23:06:05
Subsystem:
kernel build + files below scripts/ (unless maintained elsewhere), the rest · Maintainers:
Nathan Chancellor, Nicolas Schier, Linus Torvalds
For the purpose of rewriting git-am.sh into a C builtin, implement a skeletal builtin/am.c that redirects to $GIT_EXEC_PATH/git-am if the environment variable _GIT_USE_BUILTIN_AM is not defined. Since in the Makefile git-am.sh takes precedence over builtin/am.c, $GIT_EXEC_PATH/git-am will contain the shell script git-am.sh, and thus this allows us to fall back on the functional git-am.sh when running the test suite for tests that depend on a working git-am implementation. Since git-am.sh cannot handle any environment modifications by setup_git_directory(), "am" is declared with no setup flags in git.c. On the other hand, to re-implement git-am.sh in builtin/am.c, we need to run all the git dir and work tree setup logic that git.c typically does for us. As such, we work around this temporarily by copying the logic in git.c's run_builtin(), which is roughly: prefix = setup_git_directory(); trace_repo_setup(prefix); setup_work_tree(); This redirection should be removed when all the features of git-am.sh have been re-implemented in builtin/am.c. Helped-by: Junio C Hamano [off-list ref] Signed-off-by: Paul Tan <redacted> --- Makefile | 1 + builtin.h | 1 + builtin/am.c | 29 +++++++++++++++++++++++++++++ git.c | 6 ++++++ 4 files changed, 37 insertions(+) create mode 100644 builtin/am.c
diff --git a/Makefile b/Makefile
index 7efedbe..da451f8 100644
--- a/Makefile
+++ b/Makefile@@ -813,6 +813,7 @@ LIB_OBJS += xdiff-interface.o LIB_OBJS += zlib.o BUILTIN_OBJS += builtin/add.o +BUILTIN_OBJS += builtin/am.o BUILTIN_OBJS += builtin/annotate.o BUILTIN_OBJS += builtin/apply.o BUILTIN_OBJS += builtin/archive.o
diff --git a/builtin.h b/builtin.h
index 839483d..79aaf0a 100644
--- a/builtin.h
+++ b/builtin.h@@ -30,6 +30,7 @@ extern int textconv_object(const char *path, unsigned mode, const unsigned char extern int is_builtin(const char *s); extern int cmd_add(int argc, const char **argv, const char *prefix); +extern int cmd_am(int argc, const char **argv, const char *prefix); extern int cmd_annotate(int argc, const char **argv, const char *prefix); extern int cmd_apply(int argc, const char **argv, const char *prefix); extern int cmd_archive(int argc, const char **argv, const char *prefix);
diff --git a/builtin/am.c b/builtin/am.c
new file mode 100644
index 0000000..fd32caf
--- /dev/null
+++ b/builtin/am.c@@ -0,0 +1,29 @@ +/* + * Builtin "git am" + * + * Based on git-am.sh by Junio C Hamano. + */ +#include "cache.h" +#include "builtin.h" +#include "exec_cmd.h" + +int cmd_am(int argc, const char **argv, const char *prefix) +{ + + /* + * NEEDSWORK: Once all the features of git-am.sh have been + * re-implemented in builtin/am.c, this preamble can be removed. + */ + if (!getenv("_GIT_USE_BUILTIN_AM")) { + const char *path = mkpath("%s/git-am", git_exec_path()); + + if (sane_execvp(path, (char **)argv) < 0) + die_errno("could not exec %s", path); + } else { + prefix = setup_git_directory(); + trace_repo_setup(prefix); + setup_work_tree(); + } + + return 0; +}
diff --git a/git.c b/git.c
index 55c327c..38d9ad5 100644
--- a/git.c
+++ b/git.c@@ -370,6 +370,12 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv) static struct cmd_struct commands[] = { { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE }, + /* + * NEEDSWORK: Once the redirection to git-am.sh in builtin/am.c has + * been removed, this entry should be changed to + * RUN_SETUP | NEED_WORK_TREE + */ + { "am", cmd_am }, { "annotate", cmd_annotate, RUN_SETUP }, { "apply", cmd_apply, RUN_SETUP_GENTLY }, { "archive", cmd_archive },
--
2.5.0.280.gd88bd6e