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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:47:53 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:47:53 +0000
commitc8bae7493d2f2910b57f13ded012e86bdcfb0532 (patch)
tree24e09d9f84dec336720cf393e156089ca2835791 /builtin/patch-id.c
parentInitial commit. (diff)
downloadgit-c8bae7493d2f2910b57f13ded012e86bdcfb0532.tar.xz
git-c8bae7493d2f2910b57f13ded012e86bdcfb0532.zip
Adding upstream version 1:2.39.2.upstream/1%2.39.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'builtin/patch-id.c')
-rw-r--r--builtin/patch-id.c240
1 files changed, 240 insertions, 0 deletions
diff --git a/builtin/patch-id.c b/builtin/patch-id.c
new file mode 100644
index 0000000..f840fbf
--- /dev/null
+++ b/builtin/patch-id.c
@@ -0,0 +1,240 @@
+#include "cache.h"
+#include "builtin.h"
+#include "config.h"
+#include "diff.h"
+#include "parse-options.h"
+
+static void flush_current_id(int patchlen, struct object_id *id, struct object_id *result)
+{
+ if (patchlen)
+ printf("%s %s\n", oid_to_hex(result), oid_to_hex(id));
+}
+
+static int remove_space(char *line)
+{
+ char *src = line;
+ char *dst = line;
+ unsigned char c;
+
+ while ((c = *src++) != '\0') {
+ if (!isspace(c))
+ *dst++ = c;
+ }
+ return dst - line;
+}
+
+static int scan_hunk_header(const char *p, int *p_before, int *p_after)
+{
+ static const char digits[] = "0123456789";
+ const char *q, *r;
+ int n;
+
+ q = p + 4;
+ n = strspn(q, digits);
+ if (q[n] == ',') {
+ q += n + 1;
+ *p_before = atoi(q);
+ n = strspn(q, digits);
+ } else {
+ *p_before = 1;
+ }
+
+ if (n == 0 || q[n] != ' ' || q[n+1] != '+')
+ return 0;
+
+ r = q + n + 2;
+ n = strspn(r, digits);
+ if (r[n] == ',') {
+ r += n + 1;
+ *p_after = atoi(r);
+ n = strspn(r, digits);
+ } else {
+ *p_after = 1;
+ }
+ if (n == 0)
+ return 0;
+
+ return 1;
+}
+
+static int get_one_patchid(struct object_id *next_oid, struct object_id *result,
+ struct strbuf *line_buf, int stable, int verbatim)
+{
+ int patchlen = 0, found_next = 0;
+ int before = -1, after = -1;
+ int diff_is_binary = 0;
+ char pre_oid_str[GIT_MAX_HEXSZ + 1], post_oid_str[GIT_MAX_HEXSZ + 1];
+ git_hash_ctx ctx;
+
+ the_hash_algo->init_fn(&ctx);
+ oidclr(result);
+
+ while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) {
+ char *line = line_buf->buf;
+ const char *p = line;
+ int len;
+
+ /* Possibly skip over the prefix added by "log" or "format-patch" */
+ if (!skip_prefix(line, "commit ", &p) &&
+ !skip_prefix(line, "From ", &p) &&
+ starts_with(line, "\\ ") && 12 < strlen(line)) {
+ if (verbatim)
+ the_hash_algo->update_fn(&ctx, line, strlen(line));
+ continue;
+ }
+
+ if (!get_oid_hex(p, next_oid)) {
+ found_next = 1;
+ break;
+ }
+
+ /* Ignore commit comments */
+ if (!patchlen && !starts_with(line, "diff "))
+ continue;
+
+ /* Parsing diff header? */
+ if (before == -1) {
+ if (starts_with(line, "GIT binary patch") ||
+ starts_with(line, "Binary files")) {
+ diff_is_binary = 1;
+ before = 0;
+ the_hash_algo->update_fn(&ctx, pre_oid_str,
+ strlen(pre_oid_str));
+ the_hash_algo->update_fn(&ctx, post_oid_str,
+ strlen(post_oid_str));
+ if (stable)
+ flush_one_hunk(result, &ctx);
+ continue;
+ } else if (skip_prefix(line, "index ", &p)) {
+ char *oid1_end = strstr(line, "..");
+ char *oid2_end = NULL;
+ if (oid1_end)
+ oid2_end = strstr(oid1_end, " ");
+ if (!oid2_end)
+ oid2_end = line + strlen(line) - 1;
+ if (oid1_end != NULL && oid2_end != NULL) {
+ *oid1_end = *oid2_end = '\0';
+ strlcpy(pre_oid_str, p, GIT_MAX_HEXSZ + 1);
+ strlcpy(post_oid_str, oid1_end + 2, GIT_MAX_HEXSZ + 1);
+ }
+ continue;
+ } else if (starts_with(line, "--- "))
+ before = after = 1;
+ else if (!isalpha(line[0]))
+ break;
+ }
+
+ if (diff_is_binary) {
+ if (starts_with(line, "diff ")) {
+ diff_is_binary = 0;
+ before = -1;
+ }
+ continue;
+ }
+
+ /* Looking for a valid hunk header? */
+ if (before == 0 && after == 0) {
+ if (starts_with(line, "@@ -")) {
+ /* Parse next hunk, but ignore line numbers. */
+ scan_hunk_header(line, &before, &after);
+ continue;
+ }
+
+ /* Split at the end of the patch. */
+ if (!starts_with(line, "diff "))
+ break;
+
+ /* Else we're parsing another header. */
+ if (stable)
+ flush_one_hunk(result, &ctx);
+ before = after = -1;
+ }
+
+ /* If we get here, we're inside a hunk. */
+ if (line[0] == '-' || line[0] == ' ')
+ before--;
+ if (line[0] == '+' || line[0] == ' ')
+ after--;
+
+ /* Add line to hash algo (possibly removing whitespace) */
+ len = verbatim ? strlen(line) : remove_space(line);
+ patchlen += len;
+ the_hash_algo->update_fn(&ctx, line, len);
+ }
+
+ if (!found_next)
+ oidclr(next_oid);
+
+ flush_one_hunk(result, &ctx);
+
+ return patchlen;
+}
+
+static void generate_id_list(int stable, int verbatim)
+{
+ struct object_id oid, n, result;
+ int patchlen;
+ struct strbuf line_buf = STRBUF_INIT;
+
+ oidclr(&oid);
+ while (!feof(stdin)) {
+ patchlen = get_one_patchid(&n, &result, &line_buf, stable, verbatim);
+ flush_current_id(patchlen, &oid, &result);
+ oidcpy(&oid, &n);
+ }
+ strbuf_release(&line_buf);
+}
+
+static const char *const patch_id_usage[] = {
+ N_("git patch-id [--stable | --unstable | --verbatim]"), NULL
+};
+
+struct patch_id_opts {
+ int stable;
+ int verbatim;
+};
+
+static int git_patch_id_config(const char *var, const char *value, void *cb)
+{
+ struct patch_id_opts *opts = cb;
+
+ if (!strcmp(var, "patchid.stable")) {
+ opts->stable = git_config_bool(var, value);
+ return 0;
+ }
+ if (!strcmp(var, "patchid.verbatim")) {
+ opts->verbatim = git_config_bool(var, value);
+ return 0;
+ }
+
+ return git_default_config(var, value, cb);
+}
+
+int cmd_patch_id(int argc, const char **argv, const char *prefix)
+{
+ /* if nothing is set, default to unstable */
+ struct patch_id_opts config = {0, 0};
+ int opts = 0;
+ struct option builtin_patch_id_options[] = {
+ OPT_CMDMODE(0, "unstable", &opts,
+ N_("use the unstable patch-id algorithm"), 1),
+ OPT_CMDMODE(0, "stable", &opts,
+ N_("use the stable patch-id algorithm"), 2),
+ OPT_CMDMODE(0, "verbatim", &opts,
+ N_("don't strip whitespace from the patch"), 3),
+ OPT_END()
+ };
+
+ git_config(git_patch_id_config, &config);
+
+ /* verbatim implies stable */
+ if (config.verbatim)
+ config.stable = 1;
+
+ argc = parse_options(argc, argv, prefix, builtin_patch_id_options,
+ patch_id_usage, 0);
+
+ generate_id_list(opts ? opts > 1 : config.stable,
+ opts ? opts == 3 : config.verbatim);
+ return 0;
+}