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/*
* Builtin "git am"
*
* Based on git-am.sh by Junio C Hamano.
*/
#include "cache.h"
#include "builtin.h"
#include "exec_cmd.h"
#include "parse-options.h"
#include "dir.h"
struct am_state {
/* state directory path */
char *dir;
/* current and last patch numbers, 1-indexed */
int cur;
int last;
};
/**
* Initializes am_state with the default values. The state directory is set to
* dir.
*/
static void am_state_init(struct am_state *state, const char *dir)
{
memset(state, 0, sizeof(*state));
assert(dir);
state->dir = xstrdup(dir);
}
/**
* Releases memory allocated by an am_state.
*/
static void am_state_release(struct am_state *state)
{
free(state->dir);
}
/**
* Returns path relative to the am_state directory.
*/
static inline const char *am_path(const struct am_state *state, const char *path)
{
return mkpath("%s/%s", state->dir, path);
}
/**
* Returns 1 if there is an am session in progress, 0 otherwise.
*/
static int am_in_progress(const struct am_state *state)
{
struct stat st;
if (lstat(state->dir, &st) < 0 || !S_ISDIR(st.st_mode))
return 0;
if (lstat(am_path(state, "last"), &st) || !S_ISREG(st.st_mode))
return 0;
if (lstat(am_path(state, "next"), &st) || !S_ISREG(st.st_mode))
return 0;
return 1;
}
/**
* Reads the contents of `file` in the `state` directory into `sb`. Returns the
* number of bytes read on success, -1 if the file does not exist. If `trim` is
* set, trailing whitespace will be removed.
*/
static int read_state_file(struct strbuf *sb, const struct am_state *state,
const char *file, int trim)
{
strbuf_reset(sb);
if (strbuf_read_file(sb, am_path(state, file), 0) >= 0) {
if (trim)
strbuf_trim(sb);
return sb->len;
}
if (errno == ENOENT)
return -1;
die_errno(_("could not read '%s'"), am_path(state, file));
}
/**
* Loads state from disk.
*/
static void am_load(struct am_state *state)
{
struct strbuf sb = STRBUF_INIT;
if (read_state_file(&sb, state, "next", 1) < 0)
die("BUG: state file 'next' does not exist");
state->cur = strtol(sb.buf, NULL, 10);
if (read_state_file(&sb, state, "last", 1) < 0)
die("BUG: state file 'last' does not exist");
state->last = strtol(sb.buf, NULL, 10);
strbuf_release(&sb);
}
/**
* Removes the am_state directory, forcefully terminating the current am
* session.
*/
static void am_destroy(const struct am_state *state)
{
struct strbuf sb = STRBUF_INIT;
strbuf_addstr(&sb, state->dir);
remove_dir_recursively(&sb, 0);
strbuf_release(&sb);
}
/**
* Setup a new am session for applying patches
*/
static void am_setup(struct am_state *state)
{
if (mkdir(state->dir, 0777) < 0 && errno != EEXIST)
die_errno(_("failed to create directory '%s'"), state->dir);
/*
* NOTE: Since the "next" and "last" files determine if an am_state
* session is in progress, they should be written last.
*/
write_file(am_path(state, "next"), 1, "%d", state->cur);
write_file(am_path(state, "last"), 1, "%d", state->last);
}
/**
* Increments the patch pointer, and cleans am_state for the application of the
* next patch.
*/
static void am_next(struct am_state *state)
{
state->cur++;
write_file(am_path(state, "next"), 1, "%d", state->cur);
}
/**
* Applies all queued mail.
*/
static void am_run(struct am_state *state)
{
while (state->cur <= state->last) {
/* NEEDSWORK: Patch application not implemented yet */
am_next(state);
}
am_destroy(state);
}
int cmd_am(int argc, const char **argv, const char *prefix)
{
struct am_state state;
const char * const usage[] = {
N_("git am [options] [(<mbox>|<Maildir>)...]"),
NULL
};
struct option options[] = {
OPT_END()
};
/*
* 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();
}
git_config(git_default_config, NULL);
am_state_init(&state, git_path("rebase-apply"));
argc = parse_options(argc, argv, prefix, options, usage, 0);
if (am_in_progress(&state))
am_load(&state);
else
am_setup(&state);
am_run(&state);
am_state_release(&state);
return 0;
}
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