version --build-options: report commit, too, if possible

In particular when local tags are used (or tags that are pushed to some
fork) to build Git, it is very hard to figure out from which particular
revision a particular Git executable was built. It gets worse when those
tags are deleted, or even updated.

Let's just report an exact, unabbreviated commit name in our build
options.

We need to be careful, though, to report when the current commit cannot
be determined, e.g. when building from a tarball without any associated
Git repository. This could be the case also when extracting Git's source
code into an unrelated Git worktree.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Makefile b/Makefile
index 5587bccc932fdae37831dedba29680fb13b6ae29..2ce70d205d9284ee2f0454ad66dcca73f90e1dc8 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1902,7 +1902,9 @@ builtin/help.sp builtin/help.s builtin/help.o: EXTRA_CPPFLAGS = \
 version.sp version.s version.o: GIT-VERSION-FILE GIT-USER-AGENT
 version.sp version.s version.o: EXTRA_CPPFLAGS = \
        '-DGIT_VERSION="$(GIT_VERSION)"' \
-       '-DGIT_USER_AGENT=$(GIT_USER_AGENT_CQ_SQ)'
+       '-DGIT_USER_AGENT=$(GIT_USER_AGENT_CQ_SQ)' \
+       '-DGIT_BUILT_FROM_COMMIT="$(shell GIT_CEILING_DIRECTORIES=\"$(CURDIR)/..\" \
+               git rev-parse -q --verify HEAD || :)"'
 
 $(BUILT_INS): git$X
        $(QUIET_BUILT_IN)$(RM) $@ && \

diff --git a/help.c b/help.c
index cbcb159f36749af89ccd6ded21ff8da2246f0dfa..60071a9beaaedf45730385b7fc1443b402c50156 100644 (file)
--- a/help.c
+++ b/help.c
@@ -413,6 +413,11 @@ int cmd_version(int argc, const char **argv, const char *prefix)
 
        if (build_options) {
                printf("cpu: %s\n", GIT_HOST_CPU);
+               if (git_built_from_commit_string[0])
+                       printf("built from commit: %s\n",
+                              git_built_from_commit_string);
+               else
+                       printf("no commit associated with this build\n");
                printf("sizeof-long: %d\n", (int)sizeof(long));
                /* NEEDSWORK: also save and output GIT-BUILD_OPTIONS? */
        }

diff --git a/version.c b/version.c
index 6106a8098c8a46575f9afae5da9909b5c196f754..41b718c29e1b9fc2981d7d14a3d25e69c31a3030 100644 (file)
--- a/version.c
+++ b/version.c
@@ -3,6 +3,7 @@
 #include "strbuf.h"
 
 const char git_version_string[] = GIT_VERSION;
+const char git_built_from_commit_string[] = GIT_BUILT_FROM_COMMIT;
 
 const char *git_user_agent(void)
 {

diff --git a/version.h b/version.h
index 6911a4f1558de0c0d0b880a5b859925869a3e86e..7c62e80577154d79bec050424945eb500d262a0f 100644 (file)
--- a/version.h
+++ b/version.h
@@ -2,6 +2,7 @@
 #define VERSION_H
 
 extern const char git_version_string[];
+extern const char git_built_from_commit_string[];
 
 const char *git_user_agent(void);
 const char *git_user_agent_sanitized(void);