From: Jeff King <p...@peff.net>
This allows you to run:
git replace --edit SHA1
to get dumped in an editor with the contents of the object
for SHA1. The result is then read back in and used as a
"replace" object for SHA1. The writing/reading is
type-aware, so you get to edit "ls-tree" output rather than
the binary tree format.
Missing documentation and tests.
Signed-off-by: Jeff King <p...@peff.net>
Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
builtin/replace.c | 112 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 111 insertions(+), 1 deletion(-)
diff --git a/builtin/replace.c b/builtin/replace.c
index af40129..3da1bae 100644
--- a/builtin/replace.c
+++ b/builtin/replace.c
@@ -12,6 +12,7 @@
#include "builtin.h"
#include "refs.h"
#include "parse-options.h"
+#include "run-command.h"
static const char * const git_replace_usage[] = {
N_("git replace [-f] <object> <replacement>"),
@@ -176,6 +177,107 @@ static int replace_object(const char *object_ref, const
char *replace_ref, int f
return replace_object_sha1(object_ref, object, replace_ref, repl,
force);
}
+/*
+ * Write the contents of the object named by "sha1" to the file "filename",
+ * pretty-printed for human editing based on its type.
+ */
+static void export_object(const unsigned char *sha1, const char *filename)
+{
+ const char *argv[] = { "--no-replace-objects", "cat-file", "-p", NULL,
NULL };
+ struct child_process cmd = { argv };
+ int fd;
+
+ fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+ if (fd < 0)
+ die_errno("unable to open %s for writing", filename);
+
+ argv[3] = sha1_to_hex(sha1);
+ cmd.git_cmd = 1;
+ cmd.out = fd;
+
+ if (run_command(&cmd))
+ die("cat-file reported failure");
+
+ close(fd);
+}
+
+/*
+ * Read a previously-exported (and possibly edited) object back from
"filename",
+ * interpreting it as "type", and writing the result to the object database.
+ * The sha1 of the written object is returned via sha1.
+ */
+static void import_object(unsigned char *sha1, enum object_type type,
+ const char *filename)
+{
+ int fd;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ die_errno("unable to open %s for reading", filename);
+
+ if (type == OBJ_TREE) {
+ const char *argv[] = { "mktree", NULL };
+ struct child_process cmd = { argv };
+ struct strbuf result = STRBUF_INIT;
+
+ cmd.argv = argv;
+ cmd.git_cmd = 1;
+ cmd.in = fd;
+ cmd.out = -1;
+
+ if (start_command(&cmd))
+ die("unable to spawn mktree");
+
+ if (strbuf_read(&result, cmd.out, 41) < 0)
+ die_errno("unable to read from mktree");
+ close(cmd.out);
+
+ if (finish_command(&cmd))
+ die("mktree reported failure");
+ if (get_sha1_hex(result.buf, sha1) < 0)
+ die("mktree did not return an object name");
+
+ strbuf_release(&result);
+ } else {
+ struct stat st;
+ int flags = HASH_FORMAT_CHECK | HASH_WRITE_OBJECT;
+
+ if (fstat(fd, &st) < 0)
+ die_errno("unable to fstat %s", filename);
+ if (index_fd(sha1, fd, &st, type, NULL, flags) < 0)
+ die("unable to write object to database");
+ /* index_fd close()s fd for us */
+ }
+
+ /*
+ * No need to close(fd) here; both run-command and index-fd
+ * will have done it for us.
+ */
+}
+
+static int edit_and_replace(const char *object_ref, int force)
+{
+ char *tmpfile = git_pathdup("REPLACE_EDITOBJ");
+ enum object_type type;
+ unsigned char old[20], new[20];
+
+ if (get_sha1(object_ref, old) < 0)
+ die("Not a valid object name: '%s'", object_ref);
+
+ type = sha1_object_info(old, NULL);
+ if (type < 0)
+ die("unable to get object type for %s", sha1_to_hex(old));
+
+ export_object(old, tmpfile);
+ if (launch_editor(tmpfile, NULL, NULL) < 0)
+ die("editing object file failed");
+ import_object(new, type, tmpfile);
+
+ free(tmpfile);
+
+ return replace_object_sha1(object_ref, old, "replacement", new, force);
+}
+
int cmd_replace(int argc, const char **argv, const char *prefix)
{
int force = 0;
@@ -184,11 +286,13 @@ int cmd_replace(int argc, const char **argv, const char
*prefix)
MODE_UNSPECIFIED = 0,
MODE_LIST,
MODE_DELETE,
+ MODE_EDIT,
MODE_REPLACE
} cmdmode = MODE_UNSPECIFIED;
struct option options[] = {
OPT_CMDMODE('l', "list", &cmdmode, N_("list replace refs"),
MODE_LIST),
OPT_CMDMODE('d', "delete", &cmdmode, N_("delete replace refs"),
MODE_DELETE),
+ OPT_CMDMODE('e', "edit", &cmdmode, N_("edit existing object"),
MODE_EDIT),
OPT_BOOL('f', "force", &force, N_("replace the ref if it
exists")),
OPT_STRING(0, "format", &format, N_("format"), N_("use this
format")),
OPT_END()
@@ -205,7 +309,7 @@ int cmd_replace(int argc, const char **argv, const char
*prefix)
usage_msg_opt("--format cannot be used when not listing",
git_replace_usage, options);
- if (force && cmdmode != MODE_REPLACE)
+ if (force && cmdmode != MODE_REPLACE && cmdmode != MODE_EDIT)
usage_msg_opt("-f only makes sense when writing a replacement",
git_replace_usage, options);
@@ -222,6 +326,12 @@ int cmd_replace(int argc, const char **argv, const char
*prefix)
git_replace_usage, options);
return replace_object(argv[0], argv[1], force);
+ case MODE_EDIT:
+ if (argc != 1)
+ usage_msg_opt("-e needs exactly one argument",
+ git_replace_usage, options);
+ return edit_and_replace(argv[0], force);
+
case MODE_LIST:
if (argc > 1)
usage_msg_opt("only one pattern can be given with -l",
--
1.9.1.636.g20d5f34
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