stagit

stagit fork for git.lleb.me
git clone git://git.lleb.me/stagit
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stagit.c (32152B)


      1 #include <sys/stat.h>
      2 #include <sys/types.h>
      3 
      4 #include <err.h>
      5 #include <errno.h>
      6 #include <libgen.h>
      7 #include <limits.h>
      8 #include <stdint.h>
      9 #include <stdio.h>
     10 #include <stdlib.h>
     11 #include <string.h>
     12 #include <time.h>
     13 #include <unistd.h>
     14 
     15 #include <git2.h>
     16 
     17 #include "compat.h"
     18 
     19 struct deltainfo {
     20 	git_patch *patch;
     21 
     22 	size_t addcount;
     23 	size_t delcount;
     24 };
     25 
     26 struct commitinfo {
     27 	const git_oid *id;
     28 
     29 	char oid[GIT_OID_HEXSZ + 1];
     30 	char parentoid[GIT_OID_HEXSZ + 1];
     31 
     32 	const git_signature *author;
     33 	const git_signature *committer;
     34 	const char          *summary;
     35 	const char          *msg;
     36 
     37 	git_diff   *diff;
     38 	git_commit *commit;
     39 	git_commit *parent;
     40 	git_tree   *commit_tree;
     41 	git_tree   *parent_tree;
     42 
     43 	size_t addcount;
     44 	size_t delcount;
     45 	size_t filecount;
     46 
     47 	struct deltainfo **deltas;
     48 	size_t ndeltas;
     49 };
     50 
     51 static git_repository *repo;
     52 
     53 static const char *relpath = "";
     54 static const char *repodir;
     55 
     56 static char *name = "";
     57 static char *strippedname = "";
     58 static char description[255];
     59 static char cloneurl[1024];
     60 static char *submodules;
     61 static char *licensefiles[] = { "HEAD:LICENSE", "HEAD:LICENSE.md", "HEAD:COPYING" };
     62 static char *license;
     63 static char *readmefiles[] = { "HEAD:README", "HEAD:README.md" };
     64 static char *readme;
     65 static long long nlogcommits = -1; /* < 0 indicates not used */
     66 
     67 /* cache */
     68 static git_oid lastoid;
     69 static char lastoidstr[GIT_OID_HEXSZ + 2]; /* id + newline + NUL byte */
     70 static FILE *rcachefp, *wcachefp;
     71 static const char *cachefile;
     72 
     73 void
     74 joinpath(char *buf, size_t bufsiz, const char *path, const char *path2)
     75 {
     76 	int r;
     77 
     78 	r = snprintf(buf, bufsiz, "%s%s%s",
     79 		path, path[0] && path[strlen(path) - 1] != '/' ? "/" : "", path2);
     80 	if (r < 0 || (size_t)r >= bufsiz)
     81 		errx(1, "path truncated: '%s%s%s'",
     82 			path, path[0] && path[strlen(path) - 1] != '/' ? "/" : "", path2);
     83 }
     84 
     85 void
     86 deltainfo_free(struct deltainfo *di)
     87 {
     88 	if (!di)
     89 		return;
     90 	git_patch_free(di->patch);
     91 	memset(di, 0, sizeof(*di));
     92 	free(di);
     93 }
     94 
     95 int
     96 commitinfo_getstats(struct commitinfo *ci)
     97 {
     98 	struct deltainfo *di;
     99 	git_diff_options opts;
    100 	git_diff_find_options fopts;
    101 	const git_diff_delta *delta;
    102 	const git_diff_hunk *hunk;
    103 	const git_diff_line *line;
    104 	git_patch *patch = NULL;
    105 	size_t ndeltas, nhunks, nhunklines;
    106 	size_t i, j, k;
    107 
    108 	if (git_tree_lookup(&(ci->commit_tree), repo, git_commit_tree_id(ci->commit)))
    109 		goto err;
    110 	if (!git_commit_parent(&(ci->parent), ci->commit, 0)) {
    111 		if (git_tree_lookup(&(ci->parent_tree), repo, git_commit_tree_id(ci->parent))) {
    112 			ci->parent = NULL;
    113 			ci->parent_tree = NULL;
    114 		}
    115 	}
    116 
    117 	git_diff_init_options(&opts, GIT_DIFF_OPTIONS_VERSION);
    118 	opts.flags |= GIT_DIFF_DISABLE_PATHSPEC_MATCH |
    119 	              GIT_DIFF_IGNORE_SUBMODULES |
    120 		      GIT_DIFF_INCLUDE_TYPECHANGE;
    121 	if (git_diff_tree_to_tree(&(ci->diff), repo, ci->parent_tree, ci->commit_tree, &opts))
    122 		goto err;
    123 
    124 	if (git_diff_find_init_options(&fopts, GIT_DIFF_FIND_OPTIONS_VERSION))
    125 		goto err;
    126 	/* find renames and copies, exact matches (no heuristic) for renames. */
    127 	fopts.flags |= GIT_DIFF_FIND_RENAMES | GIT_DIFF_FIND_COPIES |
    128 	               GIT_DIFF_FIND_EXACT_MATCH_ONLY;
    129 	if (git_diff_find_similar(ci->diff, &fopts))
    130 		goto err;
    131 
    132 	ndeltas = git_diff_num_deltas(ci->diff);
    133 	if (ndeltas && !(ci->deltas = calloc(ndeltas, sizeof(struct deltainfo *))))
    134 		err(1, "calloc");
    135 
    136 	for (i = 0; i < ndeltas; i++) {
    137 		if (git_patch_from_diff(&patch, ci->diff, i))
    138 			goto err;
    139 
    140 		if (!(di = calloc(1, sizeof(struct deltainfo))))
    141 			err(1, "calloc");
    142 		di->patch = patch;
    143 		ci->deltas[i] = di;
    144 
    145 		delta = git_patch_get_delta(patch);
    146 
    147 		/* skip stats for binary data */
    148 		if (delta->flags & GIT_DIFF_FLAG_BINARY)
    149 			continue;
    150 
    151 		nhunks = git_patch_num_hunks(patch);
    152 		for (j = 0; j < nhunks; j++) {
    153 			if (git_patch_get_hunk(&hunk, &nhunklines, patch, j))
    154 				break;
    155 			for (k = 0; ; k++) {
    156 				if (git_patch_get_line_in_hunk(&line, patch, j, k))
    157 					break;
    158 				if (line->old_lineno == -1) {
    159 					di->addcount++;
    160 					ci->addcount++;
    161 				} else if (line->new_lineno == -1) {
    162 					di->delcount++;
    163 					ci->delcount++;
    164 				}
    165 			}
    166 		}
    167 	}
    168 	ci->ndeltas = i;
    169 	ci->filecount = i;
    170 
    171 	return 0;
    172 
    173 err:
    174 	git_diff_free(ci->diff);
    175 	ci->diff = NULL;
    176 	git_tree_free(ci->commit_tree);
    177 	ci->commit_tree = NULL;
    178 	git_tree_free(ci->parent_tree);
    179 	ci->parent_tree = NULL;
    180 	git_commit_free(ci->parent);
    181 	ci->parent = NULL;
    182 
    183 	if (ci->deltas)
    184 		for (i = 0; i < ci->ndeltas; i++)
    185 			deltainfo_free(ci->deltas[i]);
    186 	free(ci->deltas);
    187 	ci->deltas = NULL;
    188 	ci->ndeltas = 0;
    189 	ci->addcount = 0;
    190 	ci->delcount = 0;
    191 	ci->filecount = 0;
    192 
    193 	return -1;
    194 }
    195 
    196 void
    197 commitinfo_free(struct commitinfo *ci)
    198 {
    199 	size_t i;
    200 
    201 	if (!ci)
    202 		return;
    203 	if (ci->deltas)
    204 		for (i = 0; i < ci->ndeltas; i++)
    205 			deltainfo_free(ci->deltas[i]);
    206 
    207 	free(ci->deltas);
    208 	git_diff_free(ci->diff);
    209 	git_tree_free(ci->commit_tree);
    210 	git_tree_free(ci->parent_tree);
    211 	git_commit_free(ci->commit);
    212 	git_commit_free(ci->parent);
    213 	memset(ci, 0, sizeof(*ci));
    214 	free(ci);
    215 }
    216 
    217 struct commitinfo *
    218 commitinfo_getbyoid(const git_oid *id)
    219 {
    220 	struct commitinfo *ci;
    221 
    222 	if (!(ci = calloc(1, sizeof(struct commitinfo))))
    223 		err(1, "calloc");
    224 
    225 	if (git_commit_lookup(&(ci->commit), repo, id))
    226 		goto err;
    227 	ci->id = id;
    228 
    229 	git_oid_tostr(ci->oid, sizeof(ci->oid), git_commit_id(ci->commit));
    230 	git_oid_tostr(ci->parentoid, sizeof(ci->parentoid), git_commit_parent_id(ci->commit, 0));
    231 
    232 	ci->author = git_commit_author(ci->commit);
    233 	ci->committer = git_commit_committer(ci->commit);
    234 	ci->summary = git_commit_summary(ci->commit);
    235 	ci->msg = git_commit_message(ci->commit);
    236 
    237 	return ci;
    238 
    239 err:
    240 	commitinfo_free(ci);
    241 
    242 	return NULL;
    243 }
    244 
    245 FILE *
    246 efopen(const char *name, const char *flags)
    247 {
    248 	FILE *fp;
    249 
    250 	if (!(fp = fopen(name, flags)))
    251 		err(1, "fopen: '%s'", name);
    252 
    253 	return fp;
    254 }
    255 
    256 /* Escape characters below as HTML 2.0 / XML 1.0. */
    257 void
    258 xmlencode(FILE *fp, const char *s, size_t len)
    259 {
    260 	size_t i;
    261 
    262 	for (i = 0; *s && i < len; s++, i++) {
    263 		switch(*s) {
    264 		case '<':  fputs("&lt;",   fp); break;
    265 		case '>':  fputs("&gt;",   fp); break;
    266 		case '\'': fputs("&#39;",  fp); break;
    267 		case '&':  fputs("&amp;",  fp); break;
    268 		case '"':  fputs("&quot;", fp); break;
    269 		default:   fputc(*s, fp);
    270 		}
    271 	}
    272 }
    273 
    274 int
    275 mkdirp(const char *path)
    276 {
    277 	char tmp[PATH_MAX], *p;
    278 
    279 	if (strlcpy(tmp, path, sizeof(tmp)) >= sizeof(tmp))
    280 		errx(1, "path truncated: '%s'", path);
    281 	for (p = tmp + (tmp[0] == '/'); *p; p++) {
    282 		if (*p != '/')
    283 			continue;
    284 		*p = '\0';
    285 		if (mkdir(tmp, S_IRWXU | S_IRWXG | S_IRWXO) < 0 && errno != EEXIST)
    286 			return -1;
    287 		*p = '/';
    288 	}
    289 	if (mkdir(tmp, S_IRWXU | S_IRWXG | S_IRWXO) < 0 && errno != EEXIST)
    290 		return -1;
    291 	return 0;
    292 }
    293 
    294 void
    295 printtimez(FILE *fp, const git_time *intime)
    296 {
    297 	struct tm *intm;
    298 	time_t t;
    299 	char out[32];
    300 
    301 	t = (time_t)intime->time;
    302 	if (!(intm = gmtime(&t)))
    303 		return;
    304 	strftime(out, sizeof(out), "%Y-%m-%dT%H:%M:%SZ", intm);
    305 	fputs(out, fp);
    306 }
    307 
    308 void
    309 printtime(FILE *fp, const git_time *intime)
    310 {
    311 	struct tm *intm;
    312 	time_t t;
    313 	char out[32];
    314 
    315 	t = (time_t)intime->time + (intime->offset * 60);
    316 	if (!(intm = gmtime(&t)))
    317 		return;
    318 	strftime(out, sizeof(out), "%a, %e %b %Y %H:%M:%S", intm);
    319 	if (intime->offset < 0)
    320 		fprintf(fp, "%s -%02d%02d", out,
    321 		            -(intime->offset) / 60, -(intime->offset) % 60);
    322 	else
    323 		fprintf(fp, "%s +%02d%02d", out,
    324 		            intime->offset / 60, intime->offset % 60);
    325 }
    326 
    327 void
    328 printtimeshort(FILE *fp, const git_time *intime)
    329 {
    330 	struct tm *intm;
    331 	time_t t;
    332 	char out[32];
    333 
    334 	t = (time_t)intime->time;
    335 	if (!(intm = gmtime(&t)))
    336 		return;
    337 	strftime(out, sizeof(out), "%Y-%m-%d %H:%M", intm);
    338 	fputs(out, fp);
    339 }
    340 
    341 void
    342 writeheader(FILE *fp, const char *title)
    343 {
    344 	fputs("<!DOCTYPE html>\n"
    345 		"<html>\n<head>\n"
    346 		"<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />\n"
    347 		"<title>", fp);
    348 	xmlencode(fp, title, strlen(title));
    349 	if (title[0] && strippedname[0])
    350 		fputs(" - ", fp);
    351 	xmlencode(fp, strippedname, strlen(strippedname));
    352 	if (description[0])
    353 		fputs(" - ", fp);
    354 	xmlencode(fp, description, strlen(description));
    355 	fprintf(fp, "</title>\n<link rel=\"icon\" type=\"image/png\" href=\"%sfavicon.png\" />\n", relpath);
    356 	fprintf(fp, "<link rel=\"alternate\" type=\"application/atom+xml\" title=\"%s Atom Feed\" href=\"%satom.xml\" />\n",
    357 		name, relpath);
    358 	fprintf(fp, "<link rel=\"stylesheet\" type=\"text/css\" href=\"%sstyle.css\" />\n", relpath);
    359 	fputs("</head>\n<body>\n<table><tr><td>", fp);
    360 	fprintf(fp, "<a href=\"../%s\"><img src=\"%slogo.svg\" alt=\"\" width=\"32\" height=\"32\" /></a>",
    361 	        relpath, relpath);
    362 	fputs("</td><td><h1>", fp);
    363 	xmlencode(fp, strippedname, strlen(strippedname));
    364 	fputs("</h1><span class=\"desc\">", fp);
    365 	xmlencode(fp, description, strlen(description));
    366 	fputs("</span></td></tr>", fp);
    367 	if (cloneurl[0]) {
    368 		fputs("<tr class=\"url\"><td></td><td>git clone <a href=\"", fp);
    369 		xmlencode(fp, cloneurl, strlen(cloneurl));
    370 		fputs("\">", fp);
    371 		xmlencode(fp, cloneurl, strlen(cloneurl));
    372 		fputs("</a></td></tr>", fp);
    373 	}
    374 	fputs("<tr><td></td><td>\n", fp);
    375 	fprintf(fp, "<a href=\"%slog.html\">Log</a> | ", relpath);
    376 	fprintf(fp, "<a href=\"%sfiles.html\">Files</a> | ", relpath);
    377 	fprintf(fp, "<a href=\"%srefs.html\">Refs</a>", relpath);
    378 	if (submodules)
    379 		fprintf(fp, " | <a href=\"%sfile/%s.html\">Submodules</a>",
    380 		        relpath, submodules);
    381 	if (readme)
    382 		fprintf(fp, " | <a href=\"%sfile/%s.html\">README</a>",
    383 		        relpath, readme);
    384 	if (license)
    385 		fprintf(fp, " | <a href=\"%sfile/%s.html\">LICENSE</a>",
    386 		        relpath, license);
    387 	fputs("</td></tr></table>\n<hr/>\n<div id=\"content\">\n", fp);
    388 }
    389 
    390 void
    391 writefooter(FILE *fp)
    392 {
    393 	fputs("</div>\n</body>\n</html>\n", fp);
    394 }
    395 
    396 int
    397 writeblobhtml(FILE *fp, const git_blob *blob)
    398 {
    399 	size_t n = 0, i, prev;
    400 	const char *nfmt = "<a href=\"#l%d\" class=\"line\" id=\"l%d\">%7d</a> ";
    401 	const char *s = git_blob_rawcontent(blob);
    402 	git_off_t len = git_blob_rawsize(blob);
    403 
    404 	fputs("<pre id=\"blob\">\n", fp);
    405 
    406 	if (len > 0) {
    407 		for (i = 0, prev = 0; i < (size_t)len; i++) {
    408 			if (s[i] != '\n')
    409 				continue;
    410 			n++;
    411 			fprintf(fp, nfmt, n, n, n);
    412 			xmlencode(fp, &s[prev], i - prev + 1);
    413 			prev = i + 1;
    414 		}
    415 		/* trailing data */
    416 		if ((len - prev) > 0) {
    417 			n++;
    418 			fprintf(fp, nfmt, n, n, n);
    419 			xmlencode(fp, &s[prev], len - prev);
    420 		}
    421 	}
    422 
    423 	fputs("</pre>\n", fp);
    424 
    425 	return n;
    426 }
    427 
    428 void
    429 printcommit(FILE *fp, struct commitinfo *ci)
    430 {
    431 	fprintf(fp, "<b>commit</b> <a href=\"%scommit/%s.html\">%s</a>\n",
    432 		relpath, ci->oid, ci->oid);
    433 
    434 	if (ci->parentoid[0])
    435 		fprintf(fp, "<b>parent</b> <a href=\"%scommit/%s.html\">%s</a>\n",
    436 			relpath, ci->parentoid, ci->parentoid);
    437 
    438 	if (ci->author) {
    439 		fputs("<b>Author:</b> ", fp);
    440 		xmlencode(fp, ci->author->name, strlen(ci->author->name));
    441 		fputs(" &lt;<a href=\"mailto:", fp);
    442 		xmlencode(fp, ci->author->email, strlen(ci->author->email));
    443 		fputs("\">", fp);
    444 		xmlencode(fp, ci->author->email, strlen(ci->author->email));
    445 		fputs("</a>&gt;\n<b>Date:</b>   ", fp);
    446 		printtime(fp, &(ci->author->when));
    447 		fputc('\n', fp);
    448 	}
    449 	if (ci->msg) {
    450 		fputc('\n', fp);
    451 		xmlencode(fp, ci->msg, strlen(ci->msg));
    452 		fputc('\n', fp);
    453 	}
    454 }
    455 
    456 void
    457 printshowfile(FILE *fp, struct commitinfo *ci)
    458 {
    459 	const git_diff_delta *delta;
    460 	const git_diff_hunk *hunk;
    461 	const git_diff_line *line;
    462 	git_patch *patch;
    463 	size_t nhunks, nhunklines, changed, add, del, total, i, j, k;
    464 	char linestr[80];
    465 	int c;
    466 
    467 	printcommit(fp, ci);
    468 
    469 	if (!ci->deltas)
    470 		return;
    471 
    472 	if (ci->filecount > 1000   ||
    473 	    ci->ndeltas   > 1000   ||
    474 	    ci->addcount  > 100000 ||
    475 	    ci->delcount  > 100000) {
    476 		fputs("Diff is too large, output suppressed.\n", fp);
    477 		return;
    478 	}
    479 
    480 	/* diff stat */
    481 	fputs("<b>Diffstat:</b>\n<table>", fp);
    482 	for (i = 0; i < ci->ndeltas; i++) {
    483 		delta = git_patch_get_delta(ci->deltas[i]->patch);
    484 
    485 		switch (delta->status) {
    486 		case GIT_DELTA_ADDED:      c = 'A'; break;
    487 		case GIT_DELTA_COPIED:     c = 'C'; break;
    488 		case GIT_DELTA_DELETED:    c = 'D'; break;
    489 		case GIT_DELTA_MODIFIED:   c = 'M'; break;
    490 		case GIT_DELTA_RENAMED:    c = 'R'; break;
    491 		case GIT_DELTA_TYPECHANGE: c = 'T'; break;
    492 		default:                   c = ' '; break;
    493 		}
    494 		if (c == ' ')
    495 			fprintf(fp, "<tr><td>%c", c);
    496 		else
    497 			fprintf(fp, "<tr><td class=\"%c\">%c", c, c);
    498 
    499 		fprintf(fp, "</td><td><a href=\"#h%zu\">", i);
    500 		xmlencode(fp, delta->old_file.path, strlen(delta->old_file.path));
    501 		if (strcmp(delta->old_file.path, delta->new_file.path)) {
    502 			fputs(" -&gt; ", fp);
    503 			xmlencode(fp, delta->new_file.path, strlen(delta->new_file.path));
    504 		}
    505 
    506 		add = ci->deltas[i]->addcount;
    507 		del = ci->deltas[i]->delcount;
    508 		changed = add + del;
    509 		total = sizeof(linestr) - 2;
    510 		if (changed > total) {
    511 			if (add)
    512 				add = ((float)total / changed * add) + 1;
    513 			if (del)
    514 				del = ((float)total / changed * del) + 1;
    515 		}
    516 		memset(&linestr, '+', add);
    517 		memset(&linestr[add], '-', del);
    518 
    519 		fprintf(fp, "</a></td><td> | </td><td class=\"num\">%zu</td><td><span class=\"i\">",
    520 		        ci->deltas[i]->addcount + ci->deltas[i]->delcount);
    521 		fwrite(&linestr, 1, add, fp);
    522 		fputs("</span><span class=\"d\">", fp);
    523 		fwrite(&linestr[add], 1, del, fp);
    524 		fputs("</span></td></tr>\n", fp);
    525 	}
    526 	fprintf(fp, "</table></pre><pre>%zu file%s changed, %zu insertion%s(+), %zu deletion%s(-)\n",
    527 		ci->filecount, ci->filecount == 1 ? "" : "s",
    528 	        ci->addcount,  ci->addcount  == 1 ? "" : "s",
    529 	        ci->delcount,  ci->delcount  == 1 ? "" : "s");
    530 
    531 	fputs("<hr/>", fp);
    532 
    533 	for (i = 0; i < ci->ndeltas; i++) {
    534 		patch = ci->deltas[i]->patch;
    535 		delta = git_patch_get_delta(patch);
    536 		fprintf(fp, "<b>diff --git a/<a id=\"h%zu\" href=\"%sfile/", i, relpath);
    537 		xmlencode(fp, delta->old_file.path, strlen(delta->old_file.path));
    538 		fputs(".html\">", fp);
    539 		xmlencode(fp, delta->old_file.path, strlen(delta->old_file.path));
    540 		fprintf(fp, "</a> b/<a href=\"%sfile/", relpath);
    541 		xmlencode(fp, delta->new_file.path, strlen(delta->new_file.path));
    542 		fprintf(fp, ".html\">");
    543 		xmlencode(fp, delta->new_file.path, strlen(delta->new_file.path));
    544 		fprintf(fp, "</a></b>\n");
    545 
    546 		/* check binary data */
    547 		if (delta->flags & GIT_DIFF_FLAG_BINARY) {
    548 			fputs("Binary files differ.\n", fp);
    549 			continue;
    550 		}
    551 
    552 		nhunks = git_patch_num_hunks(patch);
    553 		for (j = 0; j < nhunks; j++) {
    554 			if (git_patch_get_hunk(&hunk, &nhunklines, patch, j))
    555 				break;
    556 
    557 			fprintf(fp, "<a href=\"#h%zu-%zu\" id=\"h%zu-%zu\" class=\"h\">", i, j, i, j);
    558 			xmlencode(fp, hunk->header, hunk->header_len);
    559 			fputs("</a>", fp);
    560 
    561 			for (k = 0; ; k++) {
    562 				if (git_patch_get_line_in_hunk(&line, patch, j, k))
    563 					break;
    564 				if (line->old_lineno == -1)
    565 					fprintf(fp, "<a href=\"#h%zu-%zu-%zu\" id=\"h%zu-%zu-%zu\" class=\"i\">+",
    566 						i, j, k, i, j, k);
    567 				else if (line->new_lineno == -1)
    568 					fprintf(fp, "<a href=\"#h%zu-%zu-%zu\" id=\"h%zu-%zu-%zu\" class=\"d\">-",
    569 						i, j, k, i, j, k);
    570 				else
    571 					fputc(' ', fp);
    572 				xmlencode(fp, line->content, line->content_len);
    573 				if (line->old_lineno == -1 || line->new_lineno == -1)
    574 					fputs("</a>", fp);
    575 			}
    576 		}
    577 	}
    578 }
    579 
    580 void
    581 writelogline(FILE *fp, struct commitinfo *ci)
    582 {
    583 	fputs("<tr><td>", fp);
    584 	if (ci->author)
    585 		printtimeshort(fp, &(ci->author->when));
    586 	fputs("</td><td>", fp);
    587 	if (ci->summary) {
    588 		fprintf(fp, "<a href=\"%scommit/%s.html\">", relpath, ci->oid);
    589 		xmlencode(fp, ci->summary, strlen(ci->summary));
    590 		fputs("</a>", fp);
    591 	}
    592 	fputs("</td><td>", fp);
    593 	if (ci->author)
    594 		xmlencode(fp, ci->author->name, strlen(ci->author->name));
    595 	fputs("</td><td class=\"num\" align=\"right\">", fp);
    596 	fprintf(fp, "%zu", ci->filecount);
    597 	fputs("</td><td class=\"num\" align=\"right\">", fp);
    598 	fprintf(fp, "+%zu", ci->addcount);
    599 	fputs("</td><td class=\"num\" align=\"right\">", fp);
    600 	fprintf(fp, "-%zu", ci->delcount);
    601 	fputs("</td></tr>\n", fp);
    602 }
    603 
    604 int
    605 writelog(FILE *fp, const git_oid *oid)
    606 {
    607 	struct commitinfo *ci;
    608 	git_revwalk *w = NULL;
    609 	git_oid id;
    610 	char path[PATH_MAX], oidstr[GIT_OID_HEXSZ + 1];
    611 	FILE *fpfile;
    612 	int r;
    613 
    614 	git_revwalk_new(&w, repo);
    615 	git_revwalk_push(w, oid);
    616 	git_revwalk_simplify_first_parent(w);
    617 
    618 	while (!git_revwalk_next(&id, w)) {
    619 		relpath = "";
    620 
    621 		if (cachefile && !memcmp(&id, &lastoid, sizeof(id)))
    622 			break;
    623 
    624 		git_oid_tostr(oidstr, sizeof(oidstr), &id);
    625 		r = snprintf(path, sizeof(path), "commit/%s.html", oidstr);
    626 		if (r < 0 || (size_t)r >= sizeof(path))
    627 			errx(1, "path truncated: 'commit/%s.html'", oidstr);
    628 		r = access(path, F_OK);
    629 
    630 		/* optimization: if there are no log lines to write and
    631 		   the commit file already exists: skip the diffstat */
    632 		if (!nlogcommits && !r)
    633 			continue;
    634 
    635 		if (!(ci = commitinfo_getbyoid(&id)))
    636 			break;
    637 		/* diffstat: for stagit HTML required for the log.html line */
    638 		if (commitinfo_getstats(ci) == -1)
    639 			goto err;
    640 
    641 		if (nlogcommits < 0) {
    642 			writelogline(fp, ci);
    643 		} else if (nlogcommits > 0) {
    644 			writelogline(fp, ci);
    645 			nlogcommits--;
    646 			if (!nlogcommits && ci->parentoid[0])
    647 				fputs("<tr><td></td><td colspan=\"5\">"
    648 				      "More commits remaining [...]</td>"
    649 				      "</tr>\n", fp);
    650 		}
    651 
    652 		if (cachefile)
    653 			writelogline(wcachefp, ci);
    654 
    655 		/* check if file exists if so skip it */
    656 		if (r) {
    657 			relpath = "../";
    658 			fpfile = efopen(path, "w");
    659 			writeheader(fpfile, ci->summary);
    660 			fputs("<pre>", fpfile);
    661 			printshowfile(fpfile, ci);
    662 			fputs("</pre>\n", fpfile);
    663 			writefooter(fpfile);
    664 			fclose(fpfile);
    665 		}
    666 err:
    667 		commitinfo_free(ci);
    668 	}
    669 	git_revwalk_free(w);
    670 
    671 	relpath = "";
    672 
    673 	return 0;
    674 }
    675 
    676 void
    677 printcommitatom(FILE *fp, struct commitinfo *ci)
    678 {
    679 	fputs("<entry>\n", fp);
    680 
    681 	fprintf(fp, "<id>%s</id>\n", ci->oid);
    682 	if (ci->author) {
    683 		fputs("<published>", fp);
    684 		printtimez(fp, &(ci->author->when));
    685 		fputs("</published>\n", fp);
    686 	}
    687 	if (ci->committer) {
    688 		fputs("<updated>", fp);
    689 		printtimez(fp, &(ci->committer->when));
    690 		fputs("</updated>\n", fp);
    691 	}
    692 	if (ci->summary) {
    693 		fputs("<title type=\"text\">", fp);
    694 		xmlencode(fp, ci->summary, strlen(ci->summary));
    695 		fputs("</title>\n", fp);
    696 	}
    697 	fprintf(fp, "<link rel=\"alternate\" type=\"text/html\" href=\"commit/%s.html\" />\n",
    698 	        ci->oid);
    699 
    700 	if (ci->author) {
    701 		fputs("<author>\n<name>", fp);
    702 		xmlencode(fp, ci->author->name, strlen(ci->author->name));
    703 		fputs("</name>\n<email>", fp);
    704 		xmlencode(fp, ci->author->email, strlen(ci->author->email));
    705 		fputs("</email>\n</author>\n", fp);
    706 	}
    707 
    708 	fputs("<content type=\"text\">", fp);
    709 	fprintf(fp, "commit %s\n", ci->oid);
    710 	if (ci->parentoid[0])
    711 		fprintf(fp, "parent %s\n", ci->parentoid);
    712 	if (ci->author) {
    713 		fputs("Author: ", fp);
    714 		xmlencode(fp, ci->author->name, strlen(ci->author->name));
    715 		fputs(" &lt;", fp);
    716 		xmlencode(fp, ci->author->email, strlen(ci->author->email));
    717 		fputs("&gt;\nDate:   ", fp);
    718 		printtime(fp, &(ci->author->when));
    719 		fputc('\n', fp);
    720 	}
    721 	if (ci->msg) {
    722 		fputc('\n', fp);
    723 		xmlencode(fp, ci->msg, strlen(ci->msg));
    724 	}
    725 	fputs("\n</content>\n</entry>\n", fp);
    726 }
    727 
    728 int
    729 writeatom(FILE *fp)
    730 {
    731 	struct commitinfo *ci;
    732 	git_revwalk *w = NULL;
    733 	git_oid id;
    734 	size_t i, m = 100; /* last 'm' commits */
    735 
    736 	fputs("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
    737 	      "<feed xmlns=\"http://www.w3.org/2005/Atom\">\n<title>", fp);
    738 	xmlencode(fp, strippedname, strlen(strippedname));
    739 	fputs(", branch HEAD</title>\n<subtitle>", fp);
    740 	xmlencode(fp, description, strlen(description));
    741 	fputs("</subtitle>\n", fp);
    742 
    743 	git_revwalk_new(&w, repo);
    744 	git_revwalk_push_head(w);
    745 	git_revwalk_simplify_first_parent(w);
    746 
    747 	for (i = 0; i < m && !git_revwalk_next(&id, w); i++) {
    748 		if (!(ci = commitinfo_getbyoid(&id)))
    749 			break;
    750 		printcommitatom(fp, ci);
    751 		commitinfo_free(ci);
    752 	}
    753 	git_revwalk_free(w);
    754 
    755 	fputs("</feed>\n", fp);
    756 
    757 	return 0;
    758 }
    759 
    760 int
    761 writeblob(git_object *obj, const char *fpath, const char *filename, git_off_t filesize)
    762 {
    763 	char tmp[PATH_MAX] = "", *d;
    764 	const char *p;
    765 	int lc = 0;
    766 	FILE *fp;
    767 
    768 	if (strlcpy(tmp, fpath, sizeof(tmp)) >= sizeof(tmp))
    769 		errx(1, "path truncated: '%s'", fpath);
    770 	if (!(d = dirname(tmp)))
    771 		err(1, "dirname");
    772 	if (mkdirp(d))
    773 		return -1;
    774 
    775 	for (p = fpath, tmp[0] = '\0'; *p; p++) {
    776 		if (*p == '/' && strlcat(tmp, "../", sizeof(tmp)) >= sizeof(tmp))
    777 			errx(1, "path truncated: '../%s'", tmp);
    778 	}
    779 	relpath = tmp;
    780 
    781 	fp = efopen(fpath, "w");
    782 	writeheader(fp, filename);
    783 	fputs("<p> ", fp);
    784 	xmlencode(fp, filename, strlen(filename));
    785 	fprintf(fp, " (%juB)", (uintmax_t)filesize);
    786 	fputs("</p><hr/>", fp);
    787 
    788 	if (git_blob_is_binary((git_blob *)obj)) {
    789 		fputs("<p>Binary file.</p>\n", fp);
    790 	} else {
    791 		lc = writeblobhtml(fp, (git_blob *)obj);
    792 		if (ferror(fp))
    793 			err(1, "fwrite");
    794 	}
    795 	writefooter(fp);
    796 	fclose(fp);
    797 
    798 	relpath = "";
    799 
    800 	return lc;
    801 }
    802 
    803 const char *
    804 filemode(git_filemode_t m)
    805 {
    806 	static char mode[11];
    807 
    808 	memset(mode, '-', sizeof(mode) - 1);
    809 	mode[10] = '\0';
    810 
    811 	if (S_ISREG(m))
    812 		mode[0] = '-';
    813 	else if (S_ISBLK(m))
    814 		mode[0] = 'b';
    815 	else if (S_ISCHR(m))
    816 		mode[0] = 'c';
    817 	else if (S_ISDIR(m))
    818 		mode[0] = 'd';
    819 	else if (S_ISFIFO(m))
    820 		mode[0] = 'p';
    821 	else if (S_ISLNK(m))
    822 		mode[0] = 'l';
    823 	else if (S_ISSOCK(m))
    824 		mode[0] = 's';
    825 	else
    826 		mode[0] = '?';
    827 
    828 	if (m & S_IRUSR) mode[1] = 'r';
    829 	if (m & S_IWUSR) mode[2] = 'w';
    830 	if (m & S_IXUSR) mode[3] = 'x';
    831 	if (m & S_IRGRP) mode[4] = 'r';
    832 	if (m & S_IWGRP) mode[5] = 'w';
    833 	if (m & S_IXGRP) mode[6] = 'x';
    834 	if (m & S_IROTH) mode[7] = 'r';
    835 	if (m & S_IWOTH) mode[8] = 'w';
    836 	if (m & S_IXOTH) mode[9] = 'x';
    837 
    838 	if (m & S_ISUID) mode[3] = (mode[3] == 'x') ? 's' : 'S';
    839 	if (m & S_ISGID) mode[6] = (mode[6] == 'x') ? 's' : 'S';
    840 	if (m & S_ISVTX) mode[9] = (mode[9] == 'x') ? 't' : 'T';
    841 
    842 	return mode;
    843 }
    844 
    845 int
    846 writefilestree(FILE *fp, git_tree *tree, const char *path)
    847 {
    848 	const git_tree_entry *entry = NULL;
    849 	git_submodule *module = NULL;
    850 	git_object *obj = NULL;
    851 	git_off_t filesize;
    852 	const char *entryname;
    853 	char filepath[PATH_MAX], entrypath[PATH_MAX];
    854 	size_t count, i;
    855 	int lc, r, ret;
    856 
    857 	count = git_tree_entrycount(tree);
    858 	for (i = 0; i < count; i++) {
    859 		if (!(entry = git_tree_entry_byindex(tree, i)) ||
    860 		    !(entryname = git_tree_entry_name(entry)))
    861 			return -1;
    862 		joinpath(entrypath, sizeof(entrypath), path, entryname);
    863 
    864 		r = snprintf(filepath, sizeof(filepath), "file/%s.html",
    865 		         entrypath);
    866 		if (r < 0 || (size_t)r >= sizeof(filepath))
    867 			errx(1, "path truncated: 'file/%s.html'", entrypath);
    868 
    869 		if (!git_tree_entry_to_object(&obj, repo, entry)) {
    870 			switch (git_object_type(obj)) {
    871 			case GIT_OBJ_BLOB:
    872 				break;
    873 			case GIT_OBJ_TREE:
    874 				/* NOTE: recurses */
    875 				ret = writefilestree(fp, (git_tree *)obj,
    876 				                     entrypath);
    877 				git_object_free(obj);
    878 				if (ret)
    879 					return ret;
    880 				continue;
    881 			default:
    882 				git_object_free(obj);
    883 				continue;
    884 			}
    885 
    886 			filesize = git_blob_rawsize((git_blob *)obj);
    887 			lc = writeblob(obj, filepath, entryname, filesize);
    888 
    889 			fputs("<tr><td>", fp);
    890 			fputs(filemode(git_tree_entry_filemode(entry)), fp);
    891 			fprintf(fp, "</td><td><a href=\"%s", relpath);
    892 			xmlencode(fp, filepath, strlen(filepath));
    893 			fputs("\">", fp);
    894 			xmlencode(fp, entrypath, strlen(entrypath));
    895 			fputs("</a></td><td class=\"num\" align=\"right\">", fp);
    896 			if (lc > 0)
    897 				fprintf(fp, "%dL", lc);
    898 			else
    899 				fprintf(fp, "%juB", (uintmax_t)filesize);
    900 			fputs("</td></tr>\n", fp);
    901 			git_object_free(obj);
    902 		} else if (!git_submodule_lookup(&module, repo, entryname)) {
    903 			fprintf(fp, "<tr><td>m---------</td><td><a href=\"%sfile/.gitmodules.html\">",
    904 				relpath);
    905 			xmlencode(fp, entrypath, strlen(entrypath));
    906 			git_submodule_free(module);
    907 			fputs("</a></td><td class=\"num\" align=\"right\"></td></tr>\n", fp);
    908 		}
    909 	}
    910 
    911 	return 0;
    912 }
    913 
    914 int
    915 writefiles(FILE *fp, const git_oid *id)
    916 {
    917 	git_tree *tree = NULL;
    918 	git_commit *commit = NULL;
    919 	int ret = -1;
    920 
    921 	fputs("<table id=\"files\"><thead>\n<tr>"
    922 	      "<td><b>Mode</b></td><td><b>Name</b></td>"
    923 	      "<td class=\"num\" align=\"right\"><b>Size</b></td>"
    924 	      "</tr>\n</thead><tbody>\n", fp);
    925 
    926 	if (!git_commit_lookup(&commit, repo, id) &&
    927 	    !git_commit_tree(&tree, commit))
    928 		ret = writefilestree(fp, tree, "");
    929 
    930 	fputs("</tbody></table>", fp);
    931 
    932 	git_commit_free(commit);
    933 	git_tree_free(tree);
    934 
    935 	return ret;
    936 }
    937 
    938 int
    939 refs_cmp(const void *v1, const void *v2)
    940 {
    941 	git_reference *r1 = (*(git_reference **)v1);
    942 	git_reference *r2 = (*(git_reference **)v2);
    943 	int r;
    944 
    945 	if ((r = git_reference_is_branch(r1) - git_reference_is_branch(r2)))
    946 		return r;
    947 
    948 	return strcmp(git_reference_shorthand(r1),
    949 	              git_reference_shorthand(r2));
    950 }
    951 
    952 int
    953 writerefs(FILE *fp)
    954 {
    955 	struct commitinfo *ci;
    956 	const git_oid *id = NULL;
    957 	git_object *obj = NULL;
    958 	git_reference *dref = NULL, *r, *ref = NULL;
    959 	git_reference_iterator *it = NULL;
    960 	git_reference **refs = NULL;
    961 	size_t count, i, j, refcount;
    962 	const char *titles[] = { "Branches", "Tags" };
    963 	const char *ids[] = { "branches", "tags" };
    964 	const char *name;
    965 
    966 	if (git_reference_iterator_new(&it, repo))
    967 		return -1;
    968 
    969 	for (refcount = 0; !git_reference_next(&ref, it); refcount++) {
    970 		if (!(refs = reallocarray(refs, refcount + 1, sizeof(git_reference *))))
    971 			err(1, "realloc");
    972 		refs[refcount] = ref;
    973 	}
    974 	git_reference_iterator_free(it);
    975 
    976 	/* sort by type then shorthand name */
    977 	qsort(refs, refcount, sizeof(git_reference *), refs_cmp);
    978 
    979 	for (j = 0; j < 2; j++) {
    980 		for (i = 0, count = 0; i < refcount; i++) {
    981 			if (!(git_reference_is_branch(refs[i]) && j == 0) &&
    982 			    !(git_reference_is_tag(refs[i]) && j == 1))
    983 				continue;
    984 
    985 			switch (git_reference_type(refs[i])) {
    986 			case GIT_REF_SYMBOLIC:
    987 				if (git_reference_resolve(&dref, refs[i]))
    988 					goto err;
    989 				r = dref;
    990 				break;
    991 			case GIT_REF_OID:
    992 				r = refs[i];
    993 				break;
    994 			default:
    995 				continue;
    996 			}
    997 			if (!git_reference_target(r) ||
    998 			    git_reference_peel(&obj, r, GIT_OBJ_ANY))
    999 				goto err;
   1000 			if (!(id = git_object_id(obj)))
   1001 				goto err;
   1002 			if (!(ci = commitinfo_getbyoid(id)))
   1003 				break;
   1004 
   1005 			/* print header if it has an entry (first). */
   1006 			if (++count == 1) {
   1007 				fprintf(fp, "<h2>%s</h2><table id=\"%s\">"
   1008 			                "<thead>\n<tr><td><b>Name</b></td>"
   1009 				        "<td><b>Last commit date</b></td>"
   1010 				        "<td><b>Author</b></td>\n</tr>\n"
   1011 				        "</thead><tbody>\n",
   1012 				         titles[j], ids[j]);
   1013 			}
   1014 
   1015 			relpath = "";
   1016 			name = git_reference_shorthand(r);
   1017 
   1018 			fputs("<tr><td>", fp);
   1019 			xmlencode(fp, name, strlen(name));
   1020 			fputs("</td><td>", fp);
   1021 			if (ci->author)
   1022 				printtimeshort(fp, &(ci->author->when));
   1023 			fputs("</td><td>", fp);
   1024 			if (ci->author)
   1025 				xmlencode(fp, ci->author->name, strlen(ci->author->name));
   1026 			fputs("</td></tr>\n", fp);
   1027 
   1028 			relpath = "../";
   1029 
   1030 			commitinfo_free(ci);
   1031 			git_object_free(obj);
   1032 			obj = NULL;
   1033 			git_reference_free(dref);
   1034 			dref = NULL;
   1035 		}
   1036 		/* table footer */
   1037 		if (count)
   1038 			fputs("</tbody></table><br/>", fp);
   1039 	}
   1040 
   1041 err:
   1042 	git_object_free(obj);
   1043 	git_reference_free(dref);
   1044 
   1045 	for (i = 0; i < refcount; i++)
   1046 		git_reference_free(refs[i]);
   1047 	free(refs);
   1048 
   1049 	return 0;
   1050 }
   1051 
   1052 void
   1053 usage(char *argv0)
   1054 {
   1055 	fprintf(stderr, "%s [-c cachefile | -l commits] repodir\n", argv0);
   1056 	exit(1);
   1057 }
   1058 
   1059 int
   1060 main(int argc, char *argv[])
   1061 {
   1062 	git_object *obj = NULL;
   1063 	const git_oid *head = NULL;
   1064 	mode_t mask;
   1065 	FILE *fp, *fpread;
   1066 	char path[PATH_MAX], repodirabs[PATH_MAX + 1], *p;
   1067 	char tmppath[64] = "cache.XXXXXXXXXXXX", buf[BUFSIZ];
   1068 	size_t n;
   1069 	int i, fd;
   1070 
   1071 	for (i = 1; i < argc; i++) {
   1072 		if (argv[i][0] != '-') {
   1073 			if (repodir)
   1074 				usage(argv[0]);
   1075 			repodir = argv[i];
   1076 		} else if (argv[i][1] == 'c') {
   1077 			if (nlogcommits > 0 || i + 1 >= argc)
   1078 				usage(argv[0]);
   1079 			cachefile = argv[++i];
   1080 		} else if (argv[i][1] == 'l') {
   1081 			if (cachefile || i + 1 >= argc)
   1082 				usage(argv[0]);
   1083 			errno = 0;
   1084 			nlogcommits = strtoll(argv[++i], &p, 10);
   1085 			if (argv[i][0] == '\0' || *p != '\0' ||
   1086 			    nlogcommits <= 0 || errno)
   1087 				usage(argv[0]);
   1088 		}
   1089 	}
   1090 	if (!repodir)
   1091 		usage(argv[0]);
   1092 
   1093 	if (!realpath(repodir, repodirabs))
   1094 		err(1, "realpath");
   1095 
   1096 	git_libgit2_init();
   1097 
   1098 #ifdef __OpenBSD__
   1099 	if (unveil(repodir, "r") == -1)
   1100 		err(1, "unveil: %s", repodir);
   1101 	if (unveil(".", "rwc") == -1)
   1102 		err(1, "unveil: .");
   1103 	if (cachefile && unveil(cachefile, "rwc") == -1)
   1104 		err(1, "unveil: %s", cachefile);
   1105 
   1106 	if (cachefile) {
   1107 		if (pledge("stdio rpath wpath cpath fattr", NULL) == -1)
   1108 			err(1, "pledge");
   1109 	} else {
   1110 		if (pledge("stdio rpath wpath cpath", NULL) == -1)
   1111 			err(1, "pledge");
   1112 	}
   1113 #endif
   1114 
   1115 	if (git_repository_open_ext(&repo, repodir,
   1116 		GIT_REPOSITORY_OPEN_NO_SEARCH, NULL) < 0) {
   1117 		fprintf(stderr, "%s: cannot open repository\n", argv[0]);
   1118 		return 1;
   1119 	}
   1120 
   1121 	/* find HEAD */
   1122 	if (!git_revparse_single(&obj, repo, "HEAD"))
   1123 		head = git_object_id(obj);
   1124 	git_object_free(obj);
   1125 
   1126 	/* use directory name as name */
   1127 	if ((name = strrchr(repodirabs, '/')))
   1128 		name++;
   1129 	else
   1130 		name = "";
   1131 
   1132 	/* strip .git suffix */
   1133 	if (!(strippedname = strdup(name)))
   1134 		err(1, "strdup");
   1135 	if ((p = strrchr(strippedname, '.')))
   1136 		if (!strcmp(p, ".git"))
   1137 			*p = '\0';
   1138 
   1139 	/* read description or .git/description */
   1140 	joinpath(path, sizeof(path), repodir, "description");
   1141 	if (!(fpread = fopen(path, "r"))) {
   1142 		joinpath(path, sizeof(path), repodir, ".git/description");
   1143 		fpread = fopen(path, "r");
   1144 	}
   1145 	if (fpread) {
   1146 		if (!fgets(description, sizeof(description), fpread))
   1147 			description[0] = '\0';
   1148 		fclose(fpread);
   1149 	}
   1150 
   1151 	/* read url or .git/url */
   1152 	joinpath(path, sizeof(path), repodir, "url");
   1153 	if (!(fpread = fopen(path, "r"))) {
   1154 		joinpath(path, sizeof(path), repodir, ".git/url");
   1155 		fpread = fopen(path, "r");
   1156 	}
   1157 	if (fpread) {
   1158 		if (!fgets(cloneurl, sizeof(cloneurl), fpread))
   1159 			cloneurl[0] = '\0';
   1160 		cloneurl[strcspn(cloneurl, "\n")] = '\0';
   1161 		fclose(fpread);
   1162 	}
   1163 
   1164 	/* check LICENSE */
   1165 	for (i = 0; i < sizeof(licensefiles) / sizeof(*licensefiles) && !license; i++) {
   1166 		if (!git_revparse_single(&obj, repo, licensefiles[i]) &&
   1167 		    git_object_type(obj) == GIT_OBJ_BLOB)
   1168 			license = licensefiles[i] + strlen("HEAD:");
   1169 		git_object_free(obj);
   1170 	}
   1171 
   1172 	/* check README */
   1173 	for (i = 0; i < sizeof(readmefiles) / sizeof(*readmefiles) && !readme; i++) {
   1174 		if (!git_revparse_single(&obj, repo, readmefiles[i]) &&
   1175 		    git_object_type(obj) == GIT_OBJ_BLOB)
   1176 			readme = readmefiles[i] + strlen("HEAD:");
   1177 		git_object_free(obj);
   1178 	}
   1179 
   1180 	if (!git_revparse_single(&obj, repo, "HEAD:.gitmodules") &&
   1181 	    git_object_type(obj) == GIT_OBJ_BLOB)
   1182 		submodules = ".gitmodules";
   1183 	git_object_free(obj);
   1184 
   1185 	/* log for HEAD */
   1186 	fp = efopen("log.html", "w");
   1187 	relpath = "";
   1188 	mkdir("commit", S_IRWXU | S_IRWXG | S_IRWXO);
   1189 	writeheader(fp, "Log");
   1190 	fputs("<table id=\"log\"><thead>\n<tr><td><b>Date</b></td>"
   1191 	      "<td><b>Commit message</b></td>"
   1192 	      "<td><b>Author</b></td><td class=\"num\" align=\"right\"><b>Files</b></td>"
   1193 	      "<td class=\"num\" align=\"right\"><b>+</b></td>"
   1194 	      "<td class=\"num\" align=\"right\"><b>-</b></td></tr>\n</thead><tbody>\n", fp);
   1195 
   1196 	if (cachefile && head) {
   1197 		/* read from cache file (does not need to exist) */
   1198 		if ((rcachefp = fopen(cachefile, "r"))) {
   1199 			if (!fgets(lastoidstr, sizeof(lastoidstr), rcachefp))
   1200 				errx(1, "%s: no object id", cachefile);
   1201 			if (git_oid_fromstr(&lastoid, lastoidstr))
   1202 				errx(1, "%s: invalid object id", cachefile);
   1203 		}
   1204 
   1205 		/* write log to (temporary) cache */
   1206 		if ((fd = mkstemp(tmppath)) == -1)
   1207 			err(1, "mkstemp");
   1208 		if (!(wcachefp = fdopen(fd, "w")))
   1209 			err(1, "fdopen: '%s'", tmppath);
   1210 		/* write last commit id (HEAD) */
   1211 		git_oid_tostr(buf, sizeof(buf), head);
   1212 		fprintf(wcachefp, "%s\n", buf);
   1213 
   1214 		writelog(fp, head);
   1215 
   1216 		if (rcachefp) {
   1217 			/* append previous log to log.html and the new cache */
   1218 			while (!feof(rcachefp)) {
   1219 				n = fread(buf, 1, sizeof(buf), rcachefp);
   1220 				if (ferror(rcachefp))
   1221 					err(1, "fread");
   1222 				if (fwrite(buf, 1, n, fp) != n ||
   1223 				    fwrite(buf, 1, n, wcachefp) != n)
   1224 					err(1, "fwrite");
   1225 			}
   1226 			fclose(rcachefp);
   1227 		}
   1228 		fclose(wcachefp);
   1229 	} else {
   1230 		if (head)
   1231 			writelog(fp, head);
   1232 	}
   1233 
   1234 	fputs("</tbody></table>", fp);
   1235 	writefooter(fp);
   1236 	fclose(fp);
   1237 
   1238 	/* files for HEAD */
   1239 	fp = efopen("files.html", "w");
   1240 	writeheader(fp, "Files");
   1241 	if (head)
   1242 		writefiles(fp, head);
   1243 	writefooter(fp);
   1244 	fclose(fp);
   1245 
   1246 	/* summary page with branches and tags */
   1247 	fp = efopen("refs.html", "w");
   1248 	writeheader(fp, "Refs");
   1249 	writerefs(fp);
   1250 	writefooter(fp);
   1251 	fclose(fp);
   1252 
   1253 	/* Atom feed */
   1254 	fp = efopen("atom.xml", "w");
   1255 	writeatom(fp);
   1256 	fclose(fp);
   1257 
   1258 	/* rename new cache file on success */
   1259 	if (cachefile && head) {
   1260 		if (rename(tmppath, cachefile))
   1261 			err(1, "rename: '%s' to '%s'", tmppath, cachefile);
   1262 		umask((mask = umask(0)));
   1263 		if (chmod(cachefile,
   1264 		    (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH) & ~mask))
   1265 			err(1, "chmod: '%s'", cachefile);
   1266 	}
   1267 
   1268 	/* cleanup */
   1269 	git_repository_free(repo);
   1270 	git_libgit2_shutdown();
   1271 
   1272 	return 0;
   1273 }