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-rw-r--r--trailer.c1055
1 files changed, 1055 insertions, 0 deletions
diff --git a/trailer.c b/trailer.c
new file mode 100644
index 0000000000..11f0b9fb40
--- /dev/null
+++ b/trailer.c
@@ -0,0 +1,1055 @@
+#include "cache.h"
+#include "string-list.h"
+#include "run-command.h"
+#include "commit.h"
+#include "tempfile.h"
+#include "trailer.h"
+#include "list.h"
+/*
+ * Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
+ */
+
+enum action_where { WHERE_END, WHERE_AFTER, WHERE_BEFORE, WHERE_START };
+enum action_if_exists { EXISTS_ADD_IF_DIFFERENT_NEIGHBOR, EXISTS_ADD_IF_DIFFERENT,
+ EXISTS_ADD, EXISTS_REPLACE, EXISTS_DO_NOTHING };
+enum action_if_missing { MISSING_ADD, MISSING_DO_NOTHING };
+
+struct conf_info {
+ char *name;
+ char *key;
+ char *command;
+ enum action_where where;
+ enum action_if_exists if_exists;
+ enum action_if_missing if_missing;
+};
+
+static struct conf_info default_conf_info;
+
+struct trailer_item {
+ struct list_head list;
+ /*
+ * If this is not a trailer line, the line is stored in value
+ * (excluding the terminating newline) and token is NULL.
+ */
+ char *token;
+ char *value;
+};
+
+struct arg_item {
+ struct list_head list;
+ char *token;
+ char *value;
+ struct conf_info conf;
+};
+
+static LIST_HEAD(conf_head);
+
+static char *separators = ":";
+
+static int configured;
+
+#define TRAILER_ARG_STRING "$ARG"
+
+static const char *git_generated_prefixes[] = {
+ "Signed-off-by: ",
+ "(cherry picked from commit ",
+ NULL
+};
+
+/* Iterate over the elements of the list. */
+#define list_for_each_dir(pos, head, is_reverse) \
+ for (pos = is_reverse ? (head)->prev : (head)->next; \
+ pos != (head); \
+ pos = is_reverse ? pos->prev : pos->next)
+
+static int after_or_end(enum action_where where)
+{
+ return (where == WHERE_AFTER) || (where == WHERE_END);
+}
+
+/*
+ * Return the length of the string not including any final
+ * punctuation. E.g., the input "Signed-off-by:" would return
+ * 13, stripping the trailing punctuation but retaining
+ * internal punctuation.
+ */
+static size_t token_len_without_separator(const char *token, size_t len)
+{
+ while (len > 0 && !isalnum(token[len - 1]))
+ len--;
+ return len;
+}
+
+static int same_token(struct trailer_item *a, struct arg_item *b)
+{
+ size_t a_len, b_len, min_len;
+
+ if (!a->token)
+ return 0;
+
+ a_len = token_len_without_separator(a->token, strlen(a->token));
+ b_len = token_len_without_separator(b->token, strlen(b->token));
+ min_len = (a_len > b_len) ? b_len : a_len;
+
+ return !strncasecmp(a->token, b->token, min_len);
+}
+
+static int same_value(struct trailer_item *a, struct arg_item *b)
+{
+ return !strcasecmp(a->value, b->value);
+}
+
+static int same_trailer(struct trailer_item *a, struct arg_item *b)
+{
+ return same_token(a, b) && same_value(a, b);
+}
+
+static inline int is_blank_line(const char *str)
+{
+ const char *s = str;
+ while (*s && *s != '\n' && isspace(*s))
+ s++;
+ return !*s || *s == '\n';
+}
+
+static inline void strbuf_replace(struct strbuf *sb, const char *a, const char *b)
+{
+ const char *ptr = strstr(sb->buf, a);
+ if (ptr)
+ strbuf_splice(sb, ptr - sb->buf, strlen(a), b, strlen(b));
+}
+
+static void free_trailer_item(struct trailer_item *item)
+{
+ free(item->token);
+ free(item->value);
+ free(item);
+}
+
+static void free_arg_item(struct arg_item *item)
+{
+ free(item->conf.name);
+ free(item->conf.key);
+ free(item->conf.command);
+ free(item->token);
+ free(item->value);
+ free(item);
+}
+
+static char last_non_space_char(const char *s)
+{
+ int i;
+ for (i = strlen(s) - 1; i >= 0; i--)
+ if (!isspace(s[i]))
+ return s[i];
+ return '\0';
+}
+
+static void print_tok_val(FILE *outfile, const char *tok, const char *val)
+{
+ char c;
+
+ if (!tok) {
+ fprintf(outfile, "%s\n", val);
+ return;
+ }
+
+ c = last_non_space_char(tok);
+ if (!c)
+ return;
+ if (strchr(separators, c))
+ fprintf(outfile, "%s%s\n", tok, val);
+ else
+ fprintf(outfile, "%s%c %s\n", tok, separators[0], val);
+}
+
+static void print_all(FILE *outfile, struct list_head *head, int trim_empty)
+{
+ struct list_head *pos;
+ struct trailer_item *item;
+ list_for_each(pos, head) {
+ item = list_entry(pos, struct trailer_item, list);
+ if (!trim_empty || strlen(item->value) > 0)
+ print_tok_val(outfile, item->token, item->value);
+ }
+}
+
+static struct trailer_item *trailer_from_arg(struct arg_item *arg_tok)
+{
+ struct trailer_item *new = xcalloc(sizeof(*new), 1);
+ new->token = arg_tok->token;
+ new->value = arg_tok->value;
+ arg_tok->token = arg_tok->value = NULL;
+ free_arg_item(arg_tok);
+ return new;
+}
+
+static void add_arg_to_input_list(struct trailer_item *on_tok,
+ struct arg_item *arg_tok)
+{
+ int aoe = after_or_end(arg_tok->conf.where);
+ struct trailer_item *to_add = trailer_from_arg(arg_tok);
+ if (aoe)
+ list_add(&to_add->list, &on_tok->list);
+ else
+ list_add_tail(&to_add->list, &on_tok->list);
+}
+
+static int check_if_different(struct trailer_item *in_tok,
+ struct arg_item *arg_tok,
+ int check_all,
+ struct list_head *head)
+{
+ enum action_where where = arg_tok->conf.where;
+ struct list_head *next_head;
+ do {
+ if (same_trailer(in_tok, arg_tok))
+ return 0;
+ /*
+ * if we want to add a trailer after another one,
+ * we have to check those before this one
+ */
+ next_head = after_or_end(where) ? in_tok->list.prev
+ : in_tok->list.next;
+ if (next_head == head)
+ break;
+ in_tok = list_entry(next_head, struct trailer_item, list);
+ } while (check_all);
+ return 1;
+}
+
+static char *apply_command(const char *command, const char *arg)
+{
+ struct strbuf cmd = STRBUF_INIT;
+ struct strbuf buf = STRBUF_INIT;
+ struct child_process cp = CHILD_PROCESS_INIT;
+ const char *argv[] = {NULL, NULL};
+ char *result;
+
+ strbuf_addstr(&cmd, command);
+ if (arg)
+ strbuf_replace(&cmd, TRAILER_ARG_STRING, arg);
+
+ argv[0] = cmd.buf;
+ cp.argv = argv;
+ cp.env = local_repo_env;
+ cp.no_stdin = 1;
+ cp.use_shell = 1;
+
+ if (capture_command(&cp, &buf, 1024)) {
+ error(_("running trailer command '%s' failed"), cmd.buf);
+ strbuf_release(&buf);
+ result = xstrdup("");
+ } else {
+ strbuf_trim(&buf);
+ result = strbuf_detach(&buf, NULL);
+ }
+
+ strbuf_release(&cmd);
+ return result;
+}
+
+static void apply_item_command(struct trailer_item *in_tok, struct arg_item *arg_tok)
+{
+ if (arg_tok->conf.command) {
+ const char *arg;
+ if (arg_tok->value && arg_tok->value[0]) {
+ arg = arg_tok->value;
+ } else {
+ if (in_tok && in_tok->value)
+ arg = xstrdup(in_tok->value);
+ else
+ arg = xstrdup("");
+ }
+ arg_tok->value = apply_command(arg_tok->conf.command, arg);
+ free((char *)arg);
+ }
+}
+
+static void apply_arg_if_exists(struct trailer_item *in_tok,
+ struct arg_item *arg_tok,
+ struct trailer_item *on_tok,
+ struct list_head *head)
+{
+ switch (arg_tok->conf.if_exists) {
+ case EXISTS_DO_NOTHING:
+ free_arg_item(arg_tok);
+ break;
+ case EXISTS_REPLACE:
+ apply_item_command(in_tok, arg_tok);
+ add_arg_to_input_list(on_tok, arg_tok);
+ list_del(&in_tok->list);
+ free_trailer_item(in_tok);
+ break;
+ case EXISTS_ADD:
+ apply_item_command(in_tok, arg_tok);
+ add_arg_to_input_list(on_tok, arg_tok);
+ break;
+ case EXISTS_ADD_IF_DIFFERENT:
+ apply_item_command(in_tok, arg_tok);
+ if (check_if_different(in_tok, arg_tok, 1, head))
+ add_arg_to_input_list(on_tok, arg_tok);
+ else
+ free_arg_item(arg_tok);
+ break;
+ case EXISTS_ADD_IF_DIFFERENT_NEIGHBOR:
+ apply_item_command(in_tok, arg_tok);
+ if (check_if_different(on_tok, arg_tok, 0, head))
+ add_arg_to_input_list(on_tok, arg_tok);
+ else
+ free_arg_item(arg_tok);
+ break;
+ }
+}
+
+static void apply_arg_if_missing(struct list_head *head,
+ struct arg_item *arg_tok)
+{
+ enum action_where where;
+ struct trailer_item *to_add;
+
+ switch (arg_tok->conf.if_missing) {
+ case MISSING_DO_NOTHING:
+ free_arg_item(arg_tok);
+ break;
+ case MISSING_ADD:
+ where = arg_tok->conf.where;
+ apply_item_command(NULL, arg_tok);
+ to_add = trailer_from_arg(arg_tok);
+ if (after_or_end(where))
+ list_add_tail(&to_add->list, head);
+ else
+ list_add(&to_add->list, head);
+ }
+}
+
+static int find_same_and_apply_arg(struct list_head *head,
+ struct arg_item *arg_tok)
+{
+ struct list_head *pos;
+ struct trailer_item *in_tok;
+ struct trailer_item *on_tok;
+
+ enum action_where where = arg_tok->conf.where;
+ int middle = (where == WHERE_AFTER) || (where == WHERE_BEFORE);
+ int backwards = after_or_end(where);
+ struct trailer_item *start_tok;
+
+ if (list_empty(head))
+ return 0;
+
+ start_tok = list_entry(backwards ? head->prev : head->next,
+ struct trailer_item,
+ list);
+
+ list_for_each_dir(pos, head, backwards) {
+ in_tok = list_entry(pos, struct trailer_item, list);
+ if (!same_token(in_tok, arg_tok))
+ continue;
+ on_tok = middle ? in_tok : start_tok;
+ apply_arg_if_exists(in_tok, arg_tok, on_tok, head);
+ return 1;
+ }
+ return 0;
+}
+
+static void process_trailers_lists(struct list_head *head,
+ struct list_head *arg_head)
+{
+ struct list_head *pos, *p;
+ struct arg_item *arg_tok;
+
+ list_for_each_safe(pos, p, arg_head) {
+ int applied = 0;
+ arg_tok = list_entry(pos, struct arg_item, list);
+
+ list_del(pos);
+
+ applied = find_same_and_apply_arg(head, arg_tok);
+
+ if (!applied)
+ apply_arg_if_missing(head, arg_tok);
+ }
+}
+
+static int set_where(struct conf_info *item, const char *value)
+{
+ if (!strcasecmp("after", value))
+ item->where = WHERE_AFTER;
+ else if (!strcasecmp("before", value))
+ item->where = WHERE_BEFORE;
+ else if (!strcasecmp("end", value))
+ item->where = WHERE_END;
+ else if (!strcasecmp("start", value))
+ item->where = WHERE_START;
+ else
+ return -1;
+ return 0;
+}
+
+static int set_if_exists(struct conf_info *item, const char *value)
+{
+ if (!strcasecmp("addIfDifferent", value))
+ item->if_exists = EXISTS_ADD_IF_DIFFERENT;
+ else if (!strcasecmp("addIfDifferentNeighbor", value))
+ item->if_exists = EXISTS_ADD_IF_DIFFERENT_NEIGHBOR;
+ else if (!strcasecmp("add", value))
+ item->if_exists = EXISTS_ADD;
+ else if (!strcasecmp("replace", value))
+ item->if_exists = EXISTS_REPLACE;
+ else if (!strcasecmp("doNothing", value))
+ item->if_exists = EXISTS_DO_NOTHING;
+ else
+ return -1;
+ return 0;
+}
+
+static int set_if_missing(struct conf_info *item, const char *value)
+{
+ if (!strcasecmp("doNothing", value))
+ item->if_missing = MISSING_DO_NOTHING;
+ else if (!strcasecmp("add", value))
+ item->if_missing = MISSING_ADD;
+ else
+ return -1;
+ return 0;
+}
+
+static void duplicate_conf(struct conf_info *dst, const struct conf_info *src)
+{
+ *dst = *src;
+ dst->name = xstrdup_or_null(src->name);
+ dst->key = xstrdup_or_null(src->key);
+ dst->command = xstrdup_or_null(src->command);
+}
+
+static struct arg_item *get_conf_item(const char *name)
+{
+ struct list_head *pos;
+ struct arg_item *item;
+
+ /* Look up item with same name */
+ list_for_each(pos, &conf_head) {
+ item = list_entry(pos, struct arg_item, list);
+ if (!strcasecmp(item->conf.name, name))
+ return item;
+ }
+
+ /* Item does not already exists, create it */
+ item = xcalloc(sizeof(*item), 1);
+ duplicate_conf(&item->conf, &default_conf_info);
+ item->conf.name = xstrdup(name);
+
+ list_add_tail(&item->list, &conf_head);
+
+ return item;
+}
+
+enum trailer_info_type { TRAILER_KEY, TRAILER_COMMAND, TRAILER_WHERE,
+ TRAILER_IF_EXISTS, TRAILER_IF_MISSING };
+
+static struct {
+ const char *name;
+ enum trailer_info_type type;
+} trailer_config_items[] = {
+ { "key", TRAILER_KEY },
+ { "command", TRAILER_COMMAND },
+ { "where", TRAILER_WHERE },
+ { "ifexists", TRAILER_IF_EXISTS },
+ { "ifmissing", TRAILER_IF_MISSING }
+};
+
+static int git_trailer_default_config(const char *conf_key, const char *value, void *cb)
+{
+ const char *trailer_item, *variable_name;
+
+ if (!skip_prefix(conf_key, "trailer.", &trailer_item))
+ return 0;
+
+ variable_name = strrchr(trailer_item, '.');
+ if (!variable_name) {
+ if (!strcmp(trailer_item, "where")) {
+ if (set_where(&default_conf_info, value) < 0)
+ warning(_("unknown value '%s' for key '%s'"),
+ value, conf_key);
+ } else if (!strcmp(trailer_item, "ifexists")) {
+ if (set_if_exists(&default_conf_info, value) < 0)
+ warning(_("unknown value '%s' for key '%s'"),
+ value, conf_key);
+ } else if (!strcmp(trailer_item, "ifmissing")) {
+ if (set_if_missing(&default_conf_info, value) < 0)
+ warning(_("unknown value '%s' for key '%s'"),
+ value, conf_key);
+ } else if (!strcmp(trailer_item, "separators")) {
+ separators = xstrdup(value);
+ }
+ }
+ return 0;
+}
+
+static int git_trailer_config(const char *conf_key, const char *value, void *cb)
+{
+ const char *trailer_item, *variable_name;
+ struct arg_item *item;
+ struct conf_info *conf;
+ char *name = NULL;
+ enum trailer_info_type type;
+ int i;
+
+ if (!skip_prefix(conf_key, "trailer.", &trailer_item))
+ return 0;
+
+ variable_name = strrchr(trailer_item, '.');
+ if (!variable_name)
+ return 0;
+
+ variable_name++;
+ for (i = 0; i < ARRAY_SIZE(trailer_config_items); i++) {
+ if (strcmp(trailer_config_items[i].name, variable_name))
+ continue;
+ name = xstrndup(trailer_item, variable_name - trailer_item - 1);
+ type = trailer_config_items[i].type;
+ break;
+ }
+
+ if (!name)
+ return 0;
+
+ item = get_conf_item(name);
+ conf = &item->conf;
+ free(name);
+
+ switch (type) {
+ case TRAILER_KEY:
+ if (conf->key)
+ warning(_("more than one %s"), conf_key);
+ conf->key = xstrdup(value);
+ break;
+ case TRAILER_COMMAND:
+ if (conf->command)
+ warning(_("more than one %s"), conf_key);
+ conf->command = xstrdup(value);
+ break;
+ case TRAILER_WHERE:
+ if (set_where(conf, value))
+ warning(_("unknown value '%s' for key '%s'"), value, conf_key);
+ break;
+ case TRAILER_IF_EXISTS:
+ if (set_if_exists(conf, value))
+ warning(_("unknown value '%s' for key '%s'"), value, conf_key);
+ break;
+ case TRAILER_IF_MISSING:
+ if (set_if_missing(conf, value))
+ warning(_("unknown value '%s' for key '%s'"), value, conf_key);
+ break;
+ default:
+ die("BUG: trailer.c: unhandled type %d", type);
+ }
+ return 0;
+}
+
+static void ensure_configured(void)
+{
+ if (configured)
+ return;
+
+ /* Default config must be setup first */
+ git_config(git_trailer_default_config, NULL);
+ git_config(git_trailer_config, NULL);
+ configured = 1;
+}
+
+static const char *token_from_item(struct arg_item *item, char *tok)
+{
+ if (item->conf.key)
+ return item->conf.key;
+ if (tok)
+ return tok;
+ return item->conf.name;
+}
+
+static int token_matches_item(const char *tok, struct arg_item *item, int tok_len)
+{
+ if (!strncasecmp(tok, item->conf.name, tok_len))
+ return 1;
+ return item->conf.key ? !strncasecmp(tok, item->conf.key, tok_len) : 0;
+}
+
+/*
+ * If the given line is of the form
+ * "<token><optional whitespace><separator>..." or "<separator>...", return the
+ * location of the separator. Otherwise, return -1. The optional whitespace
+ * is allowed there primarily to allow things like "Bug #43" where <token> is
+ * "Bug" and <separator> is "#".
+ *
+ * The separator-starts-line case (in which this function returns 0) is
+ * distinguished from the non-well-formed-line case (in which this function
+ * returns -1) because some callers of this function need such a distinction.
+ */
+static int find_separator(const char *line, const char *separators)
+{
+ int whitespace_found = 0;
+ const char *c;
+ for (c = line; *c; c++) {
+ if (strchr(separators, *c))
+ return c - line;
+ if (!whitespace_found && (isalnum(*c) || *c == '-'))
+ continue;
+ if (c != line && (*c == ' ' || *c == '\t')) {
+ whitespace_found = 1;
+ continue;
+ }
+ break;
+ }
+ return -1;
+}
+
+/*
+ * Obtain the token, value, and conf from the given trailer.
+ *
+ * separator_pos must not be 0, since the token cannot be an empty string.
+ *
+ * If separator_pos is -1, interpret the whole trailer as a token.
+ */
+static void parse_trailer(struct strbuf *tok, struct strbuf *val,
+ const struct conf_info **conf, const char *trailer,
+ int separator_pos)
+{
+ struct arg_item *item;
+ int tok_len;
+ struct list_head *pos;
+
+ if (separator_pos != -1) {
+ strbuf_add(tok, trailer, separator_pos);
+ strbuf_trim(tok);
+ strbuf_addstr(val, trailer + separator_pos + 1);
+ strbuf_trim(val);
+ } else {
+ strbuf_addstr(tok, trailer);
+ strbuf_trim(tok);
+ }
+
+ /* Lookup if the token matches something in the config */
+ tok_len = token_len_without_separator(tok->buf, tok->len);
+ if (conf)
+ *conf = &default_conf_info;
+ list_for_each(pos, &conf_head) {
+ item = list_entry(pos, struct arg_item, list);
+ if (token_matches_item(tok->buf, item, tok_len)) {
+ char *tok_buf = strbuf_detach(tok, NULL);
+ if (conf)
+ *conf = &item->conf;
+ strbuf_addstr(tok, token_from_item(item, tok_buf));
+ free(tok_buf);
+ break;
+ }
+ }
+}
+
+static struct trailer_item *add_trailer_item(struct list_head *head, char *tok,
+ char *val)
+{
+ struct trailer_item *new = xcalloc(sizeof(*new), 1);
+ new->token = tok;
+ new->value = val;
+ list_add_tail(&new->list, head);
+ return new;
+}
+
+static void add_arg_item(struct list_head *arg_head, char *tok, char *val,
+ const struct conf_info *conf)
+{
+ struct arg_item *new = xcalloc(sizeof(*new), 1);
+ new->token = tok;
+ new->value = val;
+ duplicate_conf(&new->conf, conf);
+ list_add_tail(&new->list, arg_head);
+}
+
+static void process_command_line_args(struct list_head *arg_head,
+ struct string_list *trailers)
+{
+ struct string_list_item *tr;
+ struct arg_item *item;
+ struct strbuf tok = STRBUF_INIT;
+ struct strbuf val = STRBUF_INIT;
+ const struct conf_info *conf;
+ struct list_head *pos;
+
+ /*
+ * In command-line arguments, '=' is accepted (in addition to the
+ * separators that are defined).
+ */
+ char *cl_separators = xstrfmt("=%s", separators);
+
+ /* Add an arg item for each configured trailer with a command */
+ list_for_each(pos, &conf_head) {
+ item = list_entry(pos, struct arg_item, list);
+ if (item->conf.command)
+ add_arg_item(arg_head,
+ xstrdup(token_from_item(item, NULL)),
+ xstrdup(""),
+ &item->conf);
+ }
+
+ /* Add an arg item for each trailer on the command line */
+ for_each_string_list_item(tr, trailers) {
+ int separator_pos = find_separator(tr->string, cl_separators);
+ if (separator_pos == 0) {
+ struct strbuf sb = STRBUF_INIT;
+ strbuf_addstr(&sb, tr->string);
+ strbuf_trim(&sb);
+ error(_("empty trailer token in trailer '%.*s'"),
+ (int) sb.len, sb.buf);
+ strbuf_release(&sb);
+ } else {
+ parse_trailer(&tok, &val, &conf, tr->string,
+ separator_pos);
+ add_arg_item(arg_head,
+ strbuf_detach(&tok, NULL),
+ strbuf_detach(&val, NULL),
+ conf);
+ }
+ }
+
+ free(cl_separators);
+}
+
+static void read_input_file(struct strbuf *sb, const char *file)
+{
+ if (file) {
+ if (strbuf_read_file(sb, file, 0) < 0)
+ die_errno(_("could not read input file '%s'"), file);
+ } else {
+ if (strbuf_read(sb, fileno(stdin), 0) < 0)
+ die_errno(_("could not read from stdin"));
+ }
+}
+
+static const char *next_line(const char *str)
+{
+ const char *nl = strchrnul(str, '\n');
+ return nl + !!*nl;
+}
+
+/*
+ * Return the position of the start of the last line. If len is 0, return -1.
+ */
+static int last_line(const char *buf, size_t len)
+{
+ int i;
+ if (len == 0)
+ return -1;
+ if (len == 1)
+ return 0;
+ /*
+ * Skip the last character (in addition to the null terminator),
+ * because if the last character is a newline, it is considered as part
+ * of the last line anyway.
+ */
+ i = len - 2;
+
+ for (; i >= 0; i--) {
+ if (buf[i] == '\n')
+ return i + 1;
+ }
+ return 0;
+}
+
+/*
+ * Return the position of the start of the patch or the length of str if there
+ * is no patch in the message.
+ */
+static int find_patch_start(const char *str)
+{
+ const char *s;
+
+ for (s = str; *s; s = next_line(s)) {
+ if (starts_with(s, "---"))
+ return s - str;
+ }
+
+ return s - str;
+}
+
+/*
+ * Return the position of the first trailer line or len if there are no
+ * trailers.
+ */
+static int find_trailer_start(const char *buf, size_t len)
+{
+ const char *s;
+ int end_of_title, l, only_spaces = 1;
+ int recognized_prefix = 0, trailer_lines = 0, non_trailer_lines = 0;
+ /*
+ * Number of possible continuation lines encountered. This will be
+ * reset to 0 if we encounter a trailer (since those lines are to be
+ * considered continuations of that trailer), and added to
+ * non_trailer_lines if we encounter a non-trailer (since those lines
+ * are to be considered non-trailers).
+ */
+ int possible_continuation_lines = 0;
+
+ /* The first paragraph is the title and cannot be trailers */
+ for (s = buf; s < buf + len; s = next_line(s)) {
+ if (s[0] == comment_line_char)
+ continue;
+ if (is_blank_line(s))
+ break;
+ }
+ end_of_title = s - buf;
+
+ /*
+ * Get the start of the trailers by looking starting from the end for a
+ * blank line before a set of non-blank lines that (i) are all
+ * trailers, or (ii) contains at least one Git-generated trailer and
+ * consists of at least 25% trailers.
+ */
+ for (l = last_line(buf, len);
+ l >= end_of_title;
+ l = last_line(buf, l)) {
+ const char *bol = buf + l;
+ const char **p;
+ int separator_pos;
+
+ if (bol[0] == comment_line_char) {
+ non_trailer_lines += possible_continuation_lines;
+ possible_continuation_lines = 0;
+ continue;
+ }
+ if (is_blank_line(bol)) {
+ if (only_spaces)
+ continue;
+ non_trailer_lines += possible_continuation_lines;
+ if (recognized_prefix &&
+ trailer_lines * 3 >= non_trailer_lines)
+ return next_line(bol) - buf;
+ else if (trailer_lines && !non_trailer_lines)
+ return next_line(bol) - buf;
+ return len;
+ }
+ only_spaces = 0;
+
+ for (p = git_generated_prefixes; *p; p++) {
+ if (starts_with(bol, *p)) {
+ trailer_lines++;
+ possible_continuation_lines = 0;
+ recognized_prefix = 1;
+ goto continue_outer_loop;
+ }
+ }
+
+ separator_pos = find_separator(bol, separators);
+ if (separator_pos >= 1 && !isspace(bol[0])) {
+ struct list_head *pos;
+
+ trailer_lines++;
+ possible_continuation_lines = 0;
+ if (recognized_prefix)
+ continue;
+ list_for_each(pos, &conf_head) {
+ struct arg_item *item;
+ item = list_entry(pos, struct arg_item, list);
+ if (token_matches_item(bol, item,
+ separator_pos)) {
+ recognized_prefix = 1;
+ break;
+ }
+ }
+ } else if (isspace(bol[0]))
+ possible_continuation_lines++;
+ else {
+ non_trailer_lines++;
+ non_trailer_lines += possible_continuation_lines;
+ possible_continuation_lines = 0;
+ }
+continue_outer_loop:
+ ;
+ }
+
+ return len;
+}
+
+/* Return the position of the end of the trailers. */
+static int find_trailer_end(const char *buf, size_t len)
+{
+ return len - ignore_non_trailer(buf, len);
+}
+
+static int ends_with_blank_line(const char *buf, size_t len)
+{
+ int ll = last_line(buf, len);
+ if (ll < 0)
+ return 0;
+ return is_blank_line(buf + ll);
+}
+
+static int process_input_file(FILE *outfile,
+ const char *str,
+ struct list_head *head)
+{
+ struct trailer_info info;
+ struct strbuf tok = STRBUF_INIT;
+ struct strbuf val = STRBUF_INIT;
+ int i;
+
+ trailer_info_get(&info, str);
+
+ /* Print lines before the trailers as is */
+ fwrite(str, 1, info.trailer_start - str, outfile);
+
+ if (!info.blank_line_before_trailer)
+ fprintf(outfile, "\n");
+
+ for (i = 0; i < info.trailer_nr; i++) {
+ int separator_pos;
+ char *trailer = info.trailers[i];
+ if (trailer[0] == comment_line_char)
+ continue;
+ separator_pos = find_separator(trailer, separators);
+ if (separator_pos >= 1) {
+ parse_trailer(&tok, &val, NULL, trailer,
+ separator_pos);
+ add_trailer_item(head,
+ strbuf_detach(&tok, NULL),
+ strbuf_detach(&val, NULL));
+ } else {
+ strbuf_addstr(&val, trailer);
+ strbuf_strip_suffix(&val, "\n");
+ add_trailer_item(head,
+ NULL,
+ strbuf_detach(&val, NULL));
+ }
+ }
+
+ trailer_info_release(&info);
+
+ return info.trailer_end - str;
+}
+
+static void free_all(struct list_head *head)
+{
+ struct list_head *pos, *p;
+ list_for_each_safe(pos, p, head) {
+ list_del(pos);
+ free_trailer_item(list_entry(pos, struct trailer_item, list));
+ }
+}
+
+static struct tempfile trailers_tempfile;
+
+static FILE *create_in_place_tempfile(const char *file)
+{
+ struct stat st;
+ struct strbuf template = STRBUF_INIT;
+ const char *tail;
+ FILE *outfile;
+
+ if (stat(file, &st))
+ die_errno(_("could not stat %s"), file);
+ if (!S_ISREG(st.st_mode))
+ die(_("file %s is not a regular file"), file);
+ if (!(st.st_mode & S_IWUSR))
+ die(_("file %s is not writable by user"), file);
+
+ /* Create temporary file in the same directory as the original */
+ tail = strrchr(file, '/');
+ if (tail != NULL)
+ strbuf_add(&template, file, tail - file + 1);
+ strbuf_addstr(&template, "git-interpret-trailers-XXXXXX");
+
+ xmks_tempfile_m(&trailers_tempfile, template.buf, st.st_mode);
+ strbuf_release(&template);
+ outfile = fdopen_tempfile(&trailers_tempfile, "w");
+ if (!outfile)
+ die_errno(_("could not open temporary file"));
+
+ return outfile;
+}
+
+void process_trailers(const char *file, int in_place, int trim_empty, struct string_list *trailers)
+{
+ LIST_HEAD(head);
+ LIST_HEAD(arg_head);
+ struct strbuf sb = STRBUF_INIT;
+ int trailer_end;
+ FILE *outfile = stdout;
+
+ ensure_configured();
+
+ read_input_file(&sb, file);
+
+ if (in_place)
+ outfile = create_in_place_tempfile(file);
+
+ /* Print the lines before the trailers */
+ trailer_end = process_input_file(outfile, sb.buf, &head);
+
+ process_command_line_args(&arg_head, trailers);
+
+ process_trailers_lists(&head, &arg_head);
+
+ print_all(outfile, &head, trim_empty);
+
+ free_all(&head);
+
+ /* Print the lines after the trailers as is */
+ fwrite(sb.buf + trailer_end, 1, sb.len - trailer_end, outfile);
+
+ if (in_place)
+ if (rename_tempfile(&trailers_tempfile, file))
+ die_errno(_("could not rename temporary file to %s"), file);
+
+ strbuf_release(&sb);
+}
+
+void trailer_info_get(struct trailer_info *info, const char *str)
+{
+ int patch_start, trailer_end, trailer_start;
+ struct strbuf **trailer_lines, **ptr;
+ char **trailer_strings = NULL;
+ size_t nr = 0, alloc = 0;
+ char **last = NULL;
+
+ ensure_configured();
+
+ patch_start = find_patch_start(str);
+ trailer_end = find_trailer_end(str, patch_start);
+ trailer_start = find_trailer_start(str, trailer_end);
+
+ trailer_lines = strbuf_split_buf(str + trailer_start,
+ trailer_end - trailer_start,
+ '\n',
+ 0);
+ for (ptr = trailer_lines; *ptr; ptr++) {
+ if (last && isspace((*ptr)->buf[0])) {
+ struct strbuf sb = STRBUF_INIT;
+ strbuf_attach(&sb, *last, strlen(*last), strlen(*last));
+ strbuf_addbuf(&sb, *ptr);
+ *last = strbuf_detach(&sb, NULL);
+ continue;
+ }
+ ALLOC_GROW(trailer_strings, nr + 1, alloc);
+ trailer_strings[nr] = strbuf_detach(*ptr, NULL);
+ last = find_separator(trailer_strings[nr], separators) >= 1
+ ? &trailer_strings[nr]
+ : NULL;
+ nr++;
+ }
+ strbuf_list_free(trailer_lines);
+
+ info->blank_line_before_trailer = ends_with_blank_line(str,
+ trailer_start);
+ info->trailer_start = str + trailer_start;
+ info->trailer_end = str + trailer_end;
+ info->trailers = trailer_strings;
+ info->trailer_nr = nr;
+}
+
+void trailer_info_release(struct trailer_info *info)
+{
+ int i;
+ for (i = 0; i < info->trailer_nr; i++)
+ free(info->trailers[i]);
+ free(info->trailers);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-19 03:10:48 +0000