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-rw-r--r--commit-tree.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/commit-tree.c b/commit-tree.c
new file mode 100644
index 0000000..840307a
--- /dev/null
+++ b/commit-tree.c
@@ -0,0 +1,172 @@
+#include "cache.h"
+
+#include <pwd.h>
+#include <time.h>
+
+#define BLOCKING (1ul << 14)
+#define ORIG_OFFSET (40)
+
+/*
+ * Leave space at the beginning to insert the tag
+ * once we know how big things are.
+ *
+ * FIXME! Share the code with "write-tree.c"
+ */
+static void init_buffer(char **bufp, unsigned int *sizep)
+{
+ char *buf = malloc(BLOCKING);
+ memset(buf, 0, ORIG_OFFSET);
+ *sizep = ORIG_OFFSET;
+ *bufp = buf;
+}
+
+static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)
+{
+ char one_line[2048];
+ va_list args;
+ int len;
+ unsigned long alloc, size, newsize;
+ char *buf;
+
+ va_start(args, fmt);
+ len = vsnprintf(one_line, sizeof(one_line), fmt, args);
+ va_end(args);
+ size = *sizep;
+ newsize = size + len;
+ alloc = (size + 32767) & ~32767;
+ buf = *bufp;
+ if (newsize > alloc) {
+ alloc = (newsize + 32767) & ~32767;
+ buf = realloc(buf, alloc);
+ *bufp = buf;
+ }
+ *sizep = newsize;
+ memcpy(buf + size, one_line, len);
+}
+
+static int prepend_integer(char *buffer, unsigned val, int i)
+{
+ buffer[--i] = '\0';
+ do {
+ buffer[--i] = '0' + (val % 10);
+ val /= 10;
+ } while (val);
+ return i;
+}
+
+static void finish_buffer(char *tag, char **bufp, unsigned int *sizep)
+{
+ int taglen;
+ int offset;
+ char *buf = *bufp;
+ unsigned int size = *sizep;
+
+ offset = prepend_integer(buf, size - ORIG_OFFSET, ORIG_OFFSET);
+ taglen = strlen(tag);
+ offset -= taglen;
+ buf += offset;
+ size -= offset;
+ memcpy(buf, tag, taglen);
+
+ *bufp = buf;
+ *sizep = size;
+}
+
+static void remove_special(char *p)
+{
+ char c;
+ char *dst = p;
+
+ for (;;) {
+ c = *p;
+ p++;
+ switch(c) {
+ case '\n': case '<': case '>':
+ continue;
+ }
+ *dst++ = c;
+ if (!c)
+ break;
+ }
+}
+
+/*
+ * Having more than two parents may be strange, but hey, there's
+ * no conceptual reason why the file format couldn't accept multi-way
+ * merges. It might be the "union" of several packages, for example.
+ *
+ * I don't really expect that to happen, but this is here to make
+ * it clear that _conceptually_ it's ok..
+ */
+#define MAXPARENT (16)
+
+int main(int argc, char **argv)
+{
+ int i, len;
+ int parents = 0;
+ unsigned char tree_sha1[20];
+ unsigned char parent_sha1[MAXPARENT][20];
+ char *gecos, *realgecos;
+ char *email, realemail[1000];
+ char *date, *realdate;
+ char comment[1000];
+ struct passwd *pw;
+ time_t now;
+ char *buffer;
+ unsigned int size;
+
+ if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
+ usage("commit-tree <sha1> [-p <sha1>]* < changelog");
+
+ for (i = 2; i < argc; i += 2) {
+ char *a, *b;
+ a = argv[i]; b = argv[i+1];
+ if (!b || strcmp(a, "-p") || get_sha1_hex(b, parent_sha1[parents]))
+ usage("commit-tree <sha1> [-p <sha1>]* < changelog");
+ parents++;
+ }
+ if (!parents)
+ fprintf(stderr, "Committing initial tree %s\n", argv[1]);
+ pw = getpwuid(getuid());
+ if (!pw)
+ usage("You don't exist. Go away!");
+ realgecos = pw->pw_gecos;
+ len = strlen(pw->pw_name);
+ memcpy(realemail, pw->pw_name, len);
+ realemail[len] = '@';
+ gethostname(realemail+len+1, sizeof(realemail)-len-1);
+ time(&now);
+ realdate = ctime(&now);
+
+ gecos = getenv("COMMITTER_NAME") ? : realgecos;
+ email = getenv("COMMITTER_EMAIL") ? : realemail;
+ date = getenv("COMMITTER_DATE") ? : realdate;
+
+ remove_special(gecos); remove_special(realgecos);
+ remove_special(email); remove_special(realemail);
+ remove_special(date); remove_special(realdate);
+
+ init_buffer(&buffer, &size);
+ add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
+
+ /*
+ * NOTE! This ordering means that the same exact tree merged with a
+ * different order of parents will be a _different_ changeset even
+ * if everything else stays the same.
+ */
+ for (i = 0; i < parents; i++)
+ add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
+
+ /* Person/date information */
+ add_buffer(&buffer, &size, "author %s <%s> %s\n", gecos, email, date);
+ add_buffer(&buffer, &size, "committer %s <%s> %s\n\n", realgecos, realemail, realdate);
+
+ /* And add the comment */
+ while (fgets(comment, sizeof(comment), stdin) != NULL)
+ add_buffer(&buffer, &size, "%s", comment);
+
+ finish_buffer("commit ", &buffer, &size);
+
+ write_sha1_file(buffer, size);
+ return 0;
+}