l2md: initial import of lore 2 maildir

There it is. See README for more details and setup.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

13 files changed, 1557 insertions, 0 deletions

diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..437f3d6
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,347 @@
+ Note that the only valid version of the GPL as far as this project  is
+ concerned is _this_ particular version of the license (i.e. v2, not v2.2
+ or v3.x or whatever), unless explicitly otherwise stated.
+
+			Daniel Borkmann
+
+-----------------------------------------------------------------------------
+
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
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diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..19b0ce8
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+CFLAGS = -O2 -Wall -Werror
+LDFLAGS = -lgit2
+
+l2md: l2md.o config.o env.o utils.o repo.o mail.o
+	$(CC) -o $@ $^ $(LDFLAGS)
+
+install:
+	cp l2md /usr/bin/l2md
+
+uninstall:
+	$(RM) /usr/bin/l2md
+
+clean:
+	$(RM) *.o l2md
diff --git a/README b/README
new file mode 100644
index 0000000..e8ac03c
--- /dev/null
+++ b/README
@@ -0,0 +1,93 @@
+l2md - lore2maildir
+-------------------
+
+Quick and dirty hack to import lore.kernel.org list archives via git,
+export them in maildir format and keep them periodically synced.
+
+It can then be used in whichever mail client that supports maildir
+format, for example, mutt.
+
+Essentially, it avoids the need to subscribe to any of the lore lists
+via mail since all messages are now imported through git transport.
+
+Together with a smtp client like msmtp (which you may need anyway for
+git-send-email), it allows to interact on the mailing lists the usual
+way.
+
+All pretty basic and hacky at this point, patches very welcome. Please
+send them to Daniel Borkmann <daniel@iogearbox.net>.
+
+Build
+-----
+
+Links to -lgit2 which is shipped by pretty much all major distros.
+
+Fedora: libgit2-devel
+Ubuntu: libgit2-dev
+
+To build, just type:
+
+$ make
+[...]
+
+After setting up ~/.l2mdconfig (see below), run as:
+
+$ ./l2md
+
+To install, just type:
+
+# make install
+
+The l2md.service file contains an example systemd service deployment
+for letting it run in the background ...
+
+$ service l2md status
+Redirecting to /bin/systemctl status l2md.service
+● l2md.service - lore2maildir
+   Loaded: loaded (/usr/lib/systemd/system/l2md.service; enabled; vendor preset: disabled)
+   Active: active (running) since Thu 2019-09-19 12:07:17 CEST; 55s ago
+ Main PID: 31467 (l2md)
+    Tasks: 1 (limit: 4915)
+   Memory: 257.9M
+   CGroup: /system.slice/l2md.service
+           └─31467 /usr/bin/l2md
+
+The muttrc file contains an example mutt config for importing the generated
+maildir directories.
+
+Howto
+-----
+
+The repo has a few example configs: l2mdconfig and muttrc. The latter
+needs most likey no further explanation, but just to provide an example
+on how to import the directories into mutt.
+
+The l2mdconfig is an example l2md config which needs to be placed under
+~/.l2mdconfig .
+
+$ cat ~/.l2mdconfig
+[general]
+	maildir = ~/.l2md/maildir/common
+	period = 30
+
+# bpf@vger.kernel.org list
+[repo bpf]
+	url = https://lore.kernel.org/bpf/0
+	maildir = ~/.l2md/maildir/bpf
+
+# netdev@vger.kernel.org list
+[repo netdev]
+	url = https://lore.kernel.org/netdev/1
+	url = https://lore.kernel.org/netdev/0
+	initial_import = 1000
+
+The general section contains a sync period in seconds where l2md refetches
+all the git repos and looks for new messages to export into the configured
+maildirs. The maildir under general is a path to a shared maildir where
+l2md exports new mails into. This can also be specified on a per repository
+basis.
+
+The repo sections with subsequent name define a repository (duh!) with
+one or more git urls to lore and optional maildir export path as mentioned.
+If initial_import is set to >0, then it will only import first x mails upon
+initial repository creation instead of the entire archive.
diff --git a/config.c b/config.c
new file mode 100644
index 0000000..eb6d356
--- /dev/null
+++ b/config.c
@@ -0,0 +1,214 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2019 Daniel Borkmann <daniel@iogearbox.net> */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <wordexp.h>
+#include <stdbool.h>
+
+#include "l2md.h"
+
+enum {
+	STATE_NONE = 0,
+	STATE_GENERAL,
+	STATE_REPO,
+};
+
+static void config_dump(struct config *cfg)
+{
+	struct config_repo *repo;
+	struct config_url *url;
+	uint32_t i, j;
+
+	if (!verbose_enabled)
+		return;
+
+	verbose("general.maildir = %s\n", cfg->general.maildir);
+	verbose("general.period = %u\n", cfg->general.period);
+
+	repo_for_each(cfg, repo, i) {
+		verbose("repos.%s.maildir = %s\n", repo->name, repo->maildir);
+		verbose("repos.%s.initial_import = %u\n", repo->name, repo->initial_import);
+		url_for_each(repo, url, j) {
+			verbose("repos.%s.url = %s\n", repo->name, url->path);
+			verbose("repos.%s.oid_maildir = %s\n",
+				repo->name, url->oid_known ? url->oid_maildir :
+				"[unknown]");
+		}
+	}
+}
+
+static void config_probe_oids(struct config *cfg)
+{
+	struct config_repo *repo;
+	struct config_url *url;
+	char path[PATH_MAX];
+	uint32_t i, j;
+	int ret;
+
+	repo_for_each(cfg, repo, i) {
+		url_for_each(repo, url, j) {
+			repo_local_oid(cfg, repo, url, path, sizeof(path));
+			ret = xread_file(path, url->oid_maildir,
+					 sizeof(url->oid_maildir) - 1, false);
+			if (!ret)
+				url->oid_known = true;
+		}
+	}
+}
+
+static void config_set_maildir(struct config *cfg, const char *dir, bool root)
+{
+	struct config_repo *repo = repo_last(cfg);
+	char *maildir = root ? cfg->general.maildir : repo->maildir;
+	wordexp_t p;
+
+	wordexp(dir, &p, 0);
+	dir = p.we_wordv[0];
+	strlcpy(maildir, dir, sizeof(repo->maildir));
+	wordfree(&p);
+}
+
+static void config_set_initial_import(struct config *cfg, uint32_t limit)
+{
+	struct config_repo *repo = repo_last(cfg);
+
+	repo->initial_import = limit;
+	if (repo->initial_import > 0)
+		repo->limit = true;
+}
+
+static void config_new_url(struct config *cfg, const char *git_url)
+{
+	struct config_repo *repo = repo_last(cfg);
+	struct config_url *url;
+
+	repo->urls_num++;
+	repo->urls = xrealloc(repo->urls, sizeof(*repo->urls) *
+			      repo->urls_num);
+	url = url_last(repo);
+	memset(url, 0, sizeof(*url));
+	strlcpy(url->path, git_url, sizeof(url->path));
+}
+
+static void config_new_repo(struct config *cfg, const char *name)
+{
+	struct config_repo *repo;
+
+	cfg->repos_num++;
+	cfg->repos = xrealloc(cfg->repos, sizeof(*cfg->repos) *
+			      cfg->repos_num);
+	repo = repo_last(cfg);
+	memset(repo, 0, sizeof(*repo));
+	config_set_maildir(cfg, cfg->general.maildir, false);
+	strlcpy(repo->name, name, sizeof(repo->name));
+}
+
+static void config_set_defaults(struct config *cfg, const char *homedir)
+{
+	char path[PATH_MAX];
+
+	cfg->general.period = 60;
+
+	slprintf(path, sizeof(path), "%s/.l2md/", homedir);
+	strlcpy(cfg->general.base, path, sizeof(cfg->general.base));
+
+	slprintf(path, sizeof(path), "%s/.l2md/maildir", homedir);
+	strlcpy(cfg->general.maildir, path, sizeof(cfg->general.maildir));
+}
+
+void config_uninit(struct config *cfg)
+{
+	struct config_repo *repo;
+	uint32_t i;
+
+	repo_for_each(cfg, repo, i)
+		xfree(repo->urls);
+	xfree(cfg->repos);
+	xfree(cfg);
+}
+
+struct config *config_init(int argc, char **argv)
+{
+	const char *homedir = getenv("HOME");
+	char buff[1024], tmp[1024];
+	char path[PATH_MAX];
+	int state = STATE_NONE;
+	struct config *cfg;
+	FILE *fp;
+
+	if (argc > 1) {
+		if (argc == 2 && !strncmp(argv[1], "--verbose",
+					  sizeof("--verbose")))
+			verbose_enabled = true;
+		else
+			panic("Usage: %s [--verbose]\n", argv[0]);
+	}
+
+	if (!homedir)
+		panic("Cannot retrieve $HOME from env!\n");
+
+	slprintf(path, sizeof(path), "%s/.l2mdconfig", homedir);
+	fp = fopen(path, "r");
+	if (!fp)
+		panic("Cannot open config %s: %s\n", tmp, strerror(errno));
+
+	cfg = xzmalloc(sizeof(*cfg));
+	config_set_defaults(cfg, homedir);
+
+	while (fgets(buff, sizeof(buff), fp)) {
+		uint32_t val;
+
+		if (buff[0] == '#' || buff[0] == '\n')
+			continue;
+
+		switch (state) {
+		case STATE_NONE:
+		state_next:
+			if (!strcmp(buff, "[general]\n")) {
+				state = STATE_GENERAL;
+				continue;
+			} else if (sscanf(buff, "[repo %[a-z0-9-]]\n",
+					  tmp) == 1) {
+				state = STATE_REPO;
+				config_new_repo(cfg, tmp);
+				continue;
+			} else {
+				panic("Cannot parse: '%s'\n", buff);
+			}
+			break;
+
+		case STATE_GENERAL:
+			if (sscanf(buff, "\tperiod = %u", &val) == 1)
+				cfg->general.period = val;
+			else if (sscanf(buff, "\tmaildir = %s", tmp) == 1)
+				config_set_maildir(cfg, tmp, true);
+			else
+				goto state_next;
+			break;
+
+		case STATE_REPO:
+			if (sscanf(buff, "\turl = %s", tmp) == 1)
+				config_new_url(cfg, tmp);
+			else if (sscanf(buff, "\tmaildir = %s", tmp) == 1)
+				config_set_maildir(cfg, tmp, false);
+			else if (sscanf(buff, "\tinitial_import = %u", &val) == 1)
+				config_set_initial_import(cfg, val);
+			else
+				goto state_next;
+			break;
+
+		default:
+			panic("Invalid parser state: %d\n", state);
+		};
+	}
+
+	fclose(fp);
+
+	config_probe_oids(cfg);
+	config_dump(cfg);
+
+	return cfg;
+}
diff --git a/env.c b/env.c
new file mode 100644
index 0000000..3139fe2
--- /dev/null
+++ b/env.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2019 Daniel Borkmann <daniel@iogearbox.net> */
+
+#include <stdlib.h>
+#include <string.h>
+#include <libgen.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "l2md.h"
+
+static void bootstrap_base(struct config *cfg)
+{
+	xmkdir1(cfg->general.base);
+	xmkdir2(cfg->general.base, REPOS);
+	xmkdir2(cfg->general.base, OIDS);
+}
+
+static void bootstrap_repos(struct config *cfg)
+{
+	struct config_repo *repo;
+	struct config_url *url;
+	struct stat sb = {};
+	char path[PATH_MAX];
+	uint32_t i, j;
+	int ret;
+
+	verbose("Initial repository check.\n");
+
+	repo_for_each(cfg, repo, i) {
+		slprintf(path, sizeof(path), "%s/%s", REPOS, repo->name);
+		xmkdir2(cfg->general.base, path);
+
+		slprintf(path, sizeof(path), "%s/%s", OIDS, repo->name);
+		xmkdir2(cfg->general.base, path);
+
+		url_for_each(repo, url, j) {
+			repo_local_path(cfg, repo, url, path, sizeof(path));
+			ret = stat(path, &sb);
+			if (ret)
+				repo_clone(repo, url, path);
+			else
+				repo_pull(repo, url, path);
+		}
+	}
+
+	verbose("Initial repository check completed.\n");
+}
+
+static void bootstrap_mail(struct config *cfg)
+{
+	struct config_repo *repo;
+	uint32_t i;
+
+	repo_for_each(cfg, repo, i) {
+		xmkdir1_with_subdirs(repo->maildir);
+
+		xmkdir2(repo->maildir, "cur");
+		xmkdir2(repo->maildir, "tmp");
+		xmkdir2(repo->maildir, "new");
+	}
+}
+
+void bootstrap_env(struct config *cfg)
+{
+	bootstrap_base(cfg);
+	bootstrap_mail(cfg);
+	bootstrap_repos(cfg);
+
+	verbose("Bootstrap done.\n");
+}
+
+void sync_done(struct config *cfg)
+{
+	verbose("Sync done. Sleeping %us.\n", cfg->general.period);
+
+	sleep(cfg->general.period);
+}
+
+void sync_env(struct config *cfg)
+{
+	struct config_repo *repo;
+	struct config_url *url;
+	char path[PATH_MAX];
+	uint32_t i, j;
+
+	verbose("Resyncing repositories.\n");
+
+	repo_for_each(cfg, repo, i) {
+		url_for_each(repo, url, j) {
+			repo_local_path(cfg, repo, url, path, sizeof(path));
+			repo_pull(repo, url, path);
+		}
+	}
+}
diff --git a/l2md.c b/l2md.c
new file mode 100644
index 0000000..458cda0
--- /dev/null
+++ b/l2md.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2019 Daniel Borkmann <daniel@iogearbox.net> */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <unistd.h>
+#include <git2.h>
+
+#include "l2md.h"
+
+pid_t own_pid;
+
+static volatile sig_atomic_t sigint;
+
+static void signal_handler(int number)
+{
+	if (number == SIGINT)
+		sigint = 1;
+}
+
+static  __attribute__((constructor)) void main_init(void)
+{
+	git_libgit2_init();
+	own_pid = getpid();
+}
+
+static  __attribute__((destructor)) void main_exit(void)
+{
+	git_libgit2_shutdown();
+}
+
+int main(int argc, char **argv)
+{
+	struct config *cfg = config_init(argc, argv);
+
+	bootstrap_env(cfg);
+	signal(SIGINT, signal_handler);
+
+	while (!sigint) {
+		sync_mail(cfg);
+		sync_done(cfg);
+		if (sigint)
+			break;
+		sync_env(cfg);
+	}
+
+	config_uninit(cfg);
+	return 0;
+}
diff --git a/l2md.h b/l2md.h
new file mode 100644
index 0000000..7b406a6
--- /dev/null
+++ b/l2md.h
@@ -0,0 +1,127 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (C) 2019 Daniel Borkmann <daniel@iogearbox.net> */
+
+#ifndef L2MD_H
+#define L2MD_H
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <limits.h>
+#include <git2.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/time.h>
+
+/* libgit2 backwards compat crap. */
+#ifndef GIT_OBJECT_BLOB
+# define GIT_OLD_VERSION 1
+#endif
+#ifdef GIT_OLD_VERSION
+# define GIT_OBJECT_BLOB GIT_OBJ_BLOB
+# define GIT_OBJECT_COMMIT GIT_OBJ_COMMIT
+# define git_error_last giterr_last
+#endif
+
+#ifndef __check_format_printf
+# define __check_format_printf(pos_fmtstr, pos_fmtargs) \
+	__attribute__ ((format (printf, (pos_fmtstr), (pos_fmtargs))))
+#endif
+
+#define REPOS                   "repos"
+#define OIDS                    "oids"
+
+#define MAIL                    "m"
+
+struct config_general {
+	char                    maildir[PATH_MAX];
+	char                    base[PATH_MAX];
+	uint32_t                period;
+};
+
+struct config_url {
+	char                    path[PATH_MAX];
+	char                    oid_maildir[GIT_OID_HEXSZ + 1];
+	bool                    oid_known;
+};
+
+struct config_repo {
+	char		        name[128];
+	char                    maildir[PATH_MAX];
+	git_repository         *git;
+	struct config_url      *urls;
+	uint32_t                urls_num;
+	uint32_t                initial_import;
+	bool                    limit;
+};
+
+struct config {
+	struct config_general   general;
+	struct config_repo     *repos;
+	uint32_t                repos_num;
+};
+
+#define repo_for_each(cfg, repo, i) \
+	for (repo = &cfg->repos[(i = 0)]; i < cfg->repos_num; \
+	     repo = &cfg->repos[++i])
+
+#define url_for_each(repo, url, i) \
+	for (url = &repo->urls[(i = 0)]; i < repo->urls_num; \
+	     url = &repo->urls[++i])
+
+#define repo_last(cfg) \
+	&cfg->repos[cfg->repos_num - 1]
+
+#define url_last(repo) \
+	&repo->urls[repo->urls_num - 1]
+
+extern pid_t own_pid;
+extern bool verbose_enabled;
+
+struct config *config_init(int argc, char **argv);
+void config_uninit(struct config *cfg);
+
+void bootstrap_env(struct config *cfg);
+
+void sync_env(struct config *cfg);
+void sync_mail(struct config *cfg);
+void sync_done(struct config *cfg);
+
+void repo_clone(struct config_repo *repo, struct config_url *url, const char *target);
+void repo_pull(struct config_repo *repo, struct config_url *url, const char *target);
+void repo_walk_files(struct config *cfg, struct config_repo *repo, uint32_t which,
+		     const char *path, const char *oid_last, char *oid_done,
+		     void (*repo_walker)(struct config *cfg, struct config_repo *repo,
+				         uint32_t which, const char *oid,
+				         const void *raw, size_t len));
+
+void repo_local_path(struct config *cfg, struct config_repo *repo,
+		     struct config_url *url, char *out, size_t len);
+void repo_local_oid(struct config *cfg, struct config_repo *repo,
+		    struct config_url *url, char *out, size_t len);
+
+void *xmalloc(size_t size);
+void *xzmalloc(size_t size);
+void *xrealloc(void *old, size_t size);
+void xfree(void *ptr);
+
+void xmkdir1(const char *path);
+void xmkdir2(const char *base, const char *name);
+void xmkdir1_with_subdirs(const char *path);
+
+int xread_file(const char *file, char *to, size_t len, bool fatal);
+int xwrite_file(const char *file, const char *to, size_t len, bool fatal);
+
+int timeval_sub(struct timeval *res, struct timeval *x,
+		struct timeval *y);
+
+size_t strlcpy(char *dest, const char *src, size_t size);
+int slprintf(char *dst, size_t size, const char *fmt, ...);
+
+void verbose(const char *format, ...) __check_format_printf(1, 2);
+void panic(const char *format, ...) __check_format_printf(1, 2);
+void warn(const char *format, ...) __check_format_printf(1, 2);
+void die(void);
+
+#endif /* L2MD_H */
diff --git a/l2md.service b/l2md.service
new file mode 100644
index 0000000..917cac2
--- /dev/null
+++ b/l2md.service
@@ -0,0 +1,13 @@
+[Unit]
+Description=lore2maildir
+After=network-online.target
+
+[Service]
+Type=simple
+User=darkstar
+WorkingDirectory=/home/darkstar/
+ExecStart=/usr/bin/l2md
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target
diff --git a/l2mdconfig b/l2mdconfig
new file mode 100644
index 0000000..8222324
--- /dev/null
+++ b/l2mdconfig
@@ -0,0 +1,14 @@
+[general]
+	maildir = ~/.l2md/maildir/common
+	period = 30
+
+# bpf@vger.kernel.org list
+[repo bpf]
+	url = https://lore.kernel.org/bpf/0
+	maildir = ~/.l2md/maildir/bpf
+
+# netdev@vger.kernel.org list
+[repo netdev]
+	url = https://lore.kernel.org/netdev/1
+	url = https://lore.kernel.org/netdev/0
+	initial_import = 1000
diff --git a/mail.c b/mail.c
new file mode 100644
index 0000000..238da96
--- /dev/null
+++ b/mail.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2019 Daniel Borkmann <daniel@iogearbox.net> */
+
+#include <unistd.h>
+
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include "l2md.h"
+
+static void repo_walker(struct config *cfg, struct config_repo *repo, uint32_t which,
+			const char *oid, const void *raw, size_t len)
+{
+	char dst[PATH_MAX];
+
+	slprintf(dst, sizeof(dst), "%s/new/0.%06u.%s-%u-%s",
+		 repo->maildir, own_pid, repo->name, which, oid);
+
+	xwrite_file(dst, raw, len, true);
+}
+
+void sync_mail(struct config *cfg)
+{
+	struct config_repo *repo;
+	struct config_url *url;
+	char path[PATH_MAX];
+	uint32_t i, j;
+
+	verbose("Resyncing maildirs.\n");
+
+	repo_for_each(cfg, repo, i) {
+		url_for_each(repo, url, j) {
+			repo_local_path(cfg, repo, url, path, sizeof(path));
+			repo_walk_files(cfg, repo, j, path,
+					url->oid_known ? url->oid_maildir : NULL,
+					url->oid_maildir, repo_walker);
+
+			repo_local_oid(cfg, repo, url, path, sizeof(path));
+			xwrite_file(path, url->oid_maildir,
+				    sizeof(url->oid_maildir) - 1, true);
+			url->oid_known = true;
+		}
+	}
+}
diff --git a/muttrc b/muttrc
new file mode 100644
index 0000000..d4a1910
--- /dev/null
+++ b/muttrc
@@ -0,0 +1,12 @@
+# Setting up maildir and pointing l2md bpf dir to it:
+set mbox_type = Maildir
+set folder = "~/.l2md/maildir/bpf/"
+set header_cache = "~/.cache/mutt"
+set spoolfile = +/
+
+# Sorting by discussion threads:
+set sort = "threads"
+set strict_threads = "yes"
+set sort_browser = "reverse-date"
+set sort_aux = "reverse-last-date-received"
+unset collapse_unread
diff --git a/repo.c b/repo.c
new file mode 100644
index 0000000..e4c6ec5
--- /dev/null
+++ b/repo.c
@@ -0,0 +1,277 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2019 Daniel Borkmann <daniel@iogearbox.net> */
+
+#include <stdio.h>
+#include <string.h>
+#include <libgen.h>
+
+#include "l2md.h"
+
+static int progress_sideband(const char *msg, int len, void *private_data)
+{
+	verbose("Remote: %.*s", len, msg);
+	fflush(stdout);
+	return 0;
+}
+
+static void progress_checkout(const char *path, size_t curr, size_t total,
+			      void *private_data)
+{
+	verbose("Checkout: %zu/%zu\r", curr, total);
+	fflush(stdout);
+}
+
+static void setup_fetch_opts(git_fetch_options *opts)
+{
+	opts->callbacks.sideband_progress = progress_sideband;
+}
+
+static void setup_checkout_opts(git_checkout_options *opts)
+{
+	opts->checkout_strategy = GIT_CHECKOUT_SAFE;
+	opts->progress_cb = progress_checkout;
+}
+
+static void setup_clone_opts(git_clone_options *opts)
+{
+	setup_checkout_opts(&opts->checkout_opts);
+	setup_fetch_opts(&opts->fetch_opts);
+}
+
+static void panic_git(const char *subject)
+{
+	const git_error *err = git_error_last();
+	const char *err_str = err ? err->message : "unknown error";
+
+	panic("%s: %s\n", subject, err_str);
+}
+
+static void warn_git(const char *subject)
+{
+	const git_error *err = git_error_last();
+	const char *err_str = err ? err->message : "unknown error";
+
+	warn("%s: %s\n", subject, err_str);
+}
+
+void repo_clone(struct config_repo *repo, struct config_url *url,
+		const char *target)
+{
+	git_clone_options clone_opts = GIT_CLONE_OPTIONS_INIT;
+	int ret;
+
+	setup_clone_opts(&clone_opts);
+
+	verbose("Cloning: %s\n", url->path);
+
+	ret = git_clone(&repo->git, url->path, target, &clone_opts);
+	if (ret)
+		panic_git("Cannot clone git repo");
+
+	git_repository_free(repo->git);
+}
+
+static int fetch_head(const char *ref_name, const char *remote_url,
+		      const git_oid *oid, unsigned int merge,
+		      void *private_data)
+{
+	char out[GIT_OID_HEXSZ + 1];
+
+	if (merge) {
+		verbose("Merging: %s commit %s\n", ref_name,
+			git_oid_tostr(out, sizeof(out), oid));
+		git_oid_cpy(private_data, oid);
+	}
+
+	return 0;
+}
+
+void repo_pull(struct config_repo *repo, struct config_url *url,
+	       const char *target)
+{
+	git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;
+	git_fetch_options fetch_opts = GIT_FETCH_OPTIONS_INIT;
+	git_reference *head_cur, *head_new;
+	git_annotated_commit *head;
+	git_oid oid_to_merge;
+	git_object *head_obj;
+	git_remote *remote;
+	int ret;
+
+	ret = git_repository_open(&repo->git, target);
+	if (ret)
+		panic_git("Cannot open git repo");
+
+	ret = git_remote_lookup(&remote, repo->git, "origin");
+	if (ret)
+		panic_git("Cannot look up origin");
+
+	setup_fetch_opts(&fetch_opts);
+
+	verbose("Fetching: %s\n", url->path);
+
+	ret = git_remote_fetch(remote, NULL, &fetch_opts,
+			       NULL);
+	if (ret) {
+		warn_git("Cannot fetch remote");
+		goto out;
+	}
+
+	git_repository_fetchhead_foreach(repo->git, fetch_head,
+					 &oid_to_merge);
+
+	ret = git_annotated_commit_lookup(&head, repo->git,
+					  &oid_to_merge);
+	if (ret)
+		panic_git("Cannot lookup head");
+
+	ret = git_repository_head(&head_cur, repo->git);
+	if (ret)
+		panic_git("Cannot lookup current head");
+
+	ret = git_object_lookup(&head_obj, repo->git, &oid_to_merge,
+				GIT_OBJECT_COMMIT);
+	if (ret)
+		panic_git("Cannot lookup HEAD object");
+
+	setup_checkout_opts(&checkout_opts);
+
+	ret = git_checkout_tree(repo->git, head_obj, &checkout_opts);
+	if (ret)
+		panic_git("Cannot checkout tree");
+
+	ret = git_reference_set_target(&head_new, head_cur, &oid_to_merge,
+				       NULL);
+	if (ret)
+		panic_git("Cannot repoint HEAD");
+
+	git_repository_state_cleanup(repo->git);
+
+	git_annotated_commit_free(head);
+
+	git_reference_free(head_cur);
+	git_reference_free(head_new);
+
+	git_object_free(head_obj);
+out:
+	git_remote_free(remote);
+	git_repository_free(repo->git);
+}
+
+static void __repo_local_get(struct config *cfg, struct config_repo *repo,
+			     struct config_url *url, const char *which,
+			     char *out, size_t len)
+{
+	char tmp[PATH_MAX];
+
+	strcpy(tmp, url->path);
+	slprintf(out, len, "%s/%s/%s/%s", cfg->general.base, which,
+		 repo->name, basename(tmp));
+}
+
+void repo_local_path(struct config *cfg, struct config_repo *repo,
+		     struct config_url *url, char *out, size_t len)
+{
+	__repo_local_get(cfg, repo, url, REPOS, out, len);
+}
+
+void repo_local_oid(struct config *cfg, struct config_repo *repo,
+		    struct config_url *url, char *out, size_t len)
+{
+	__repo_local_get(cfg, repo, url, OIDS, out, len);
+}
+
+void repo_walk_files(struct config *cfg, struct config_repo *repo, uint32_t which,
+		     const char *path, const char *oid_last, char *oid_done,
+		     void (*repo_walker)(struct config *cfg, struct config_repo *repo,
+					 uint32_t which, const char *oid,
+					 const void *raw, size_t len))
+{
+	char oid_curr[GIT_OID_HEXSZ + 1];
+	struct timeval start, end, res;
+	git_oid coid, loid, foid;
+	bool have_first = false;
+	const git_blob *blob;
+	char spec[PATH_MAX];
+	git_revwalk *walker;
+	git_commit *commit;
+	git_object *object;
+	uint32_t count = 0;
+	int ret;
+
+	ret = git_repository_open(&repo->git, path);
+	if (ret)
+		panic_git("Cannot open git repo");
+
+	ret = git_revwalk_new(&walker, repo->git);
+	if (ret)
+		panic_git("Cannot create ref walker");
+
+	git_revwalk_sorting(walker, GIT_SORT_TIME);
+
+	ret = git_revwalk_push_head(walker);
+	if (ret)
+		panic_git("Cannot push head onto ref walker");
+	if (oid_last) {
+		ret = git_oid_fromstrn(&loid, oid_last, GIT_OID_HEXSZ);
+		if (ret)
+			panic_git("Cannot convert to git oid");
+	}
+
+	gettimeofday(&start, NULL);
+
+	while (!git_revwalk_next(&coid, walker)) {
+		ret = git_commit_lookup(&commit, repo->git, &coid);
+		if (ret)
+			panic_git("Cannot look up commit");
+
+		if (!have_first) {
+			git_oid_cpy(&foid, &coid);
+			have_first = true;
+		}
+
+		if (oid_last && !git_oid_cmp(&loid, &coid)) {
+			git_commit_free(commit);
+			break;
+		}
+
+		if (!oid_last && repo->limit) {
+			if (repo->initial_import == 0) {
+				git_commit_free(commit);
+				break;
+			}
+			repo->initial_import--;
+		}
+
+		git_oid_tostr(oid_curr, sizeof(oid_curr), &coid);
+		slprintf(spec, sizeof(spec), "%s:%s", oid_curr, MAIL);
+
+		ret = git_revparse_single(&object, repo->git, spec);
+		if (ret || git_object_type(object) != GIT_OBJECT_BLOB)
+			panic_git("Cannot revparse object");
+
+		blob = (const git_blob *)object;
+		repo_walker(cfg, repo, which, oid_curr, git_blob_rawcontent(blob),
+			    (size_t)git_blob_rawsize(blob));
+
+		git_object_free(object);
+		git_commit_free(commit);
+
+		count++;
+	}
+
+	gettimeofday(&end, NULL);
+	timeval_sub(&res, &end, &start);
+
+	if (have_first)
+		git_oid_tostr(oid_done, GIT_OID_HEXSZ + 1, &foid);
+	if (have_first && count) {
+		git_oid_tostr(oid_curr, sizeof(oid_curr), &loid);
+		printf("Processed %u new mail(s) for %s. %s: %s -> %s in %ld.%02lds.\n",
+		       count, repo->name, repo->urls[which].path, oid_last ? oid_curr :
+		       "[none]", oid_done, res.tv_sec, res.tv_usec);
+	}
+
+	git_revwalk_free(walker);
+	git_repository_free(repo->git);
+}
diff --git a/utils.c b/utils.c
new file mode 100644
index 0000000..d97af0e
--- /dev/null
+++ b/utils.c
@@ -0,0 +1,254 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2019 Daniel Borkmann <daniel@iogearbox.net> */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+
+#include "l2md.h"
+
+bool verbose_enabled;
+
+void *xmalloc(size_t size)
+{
+	void *ptr;
+
+	if (!size)
+		panic("xmalloc: zero size\n");
+	ptr = malloc(size);
+	if (ptr == NULL)
+		panic("xmalloc: out of memory (allocating %zu bytes)\n", size);
+	return ptr;
+}
+
+void *xzmalloc(size_t size)
+{
+	void *ptr = xmalloc(size);
+
+	memset(ptr, 0, size);
+	return ptr;
+}
+
+void *xrealloc(void *old, size_t size)
+{
+	void *new;
+
+	if (size == 0)
+		panic("xrealloc: zero size\n");
+	new = realloc(old, size);
+	if (new == NULL)
+		panic("xrealloc: out of memory (allocating %zu bytes)\n", size);
+	return new;
+}
+
+void xfree(void *ptr)
+{
+	free(ptr);
+}
+
+void xmkdir1(const char *path)
+{
+	struct stat sb = {};
+	int ret;
+
+	ret = stat(path, &sb);
+	if (ret) {
+		ret = mkdir(path, S_IRWXU);
+		if (ret)
+			panic("mkdir %s failed: %s\n", path, strerror(errno));
+	}
+}
+
+void xmkdir1_with_subdirs(const char *path)
+{
+	char tmp[PATH_MAX], *ptr;
+	size_t len;
+
+	slprintf(tmp, sizeof(tmp),"%s", path);
+	len = strlen(tmp);
+	if (tmp[len - 1] == '/')
+		tmp[len - 1] = 0;
+	for (ptr = tmp + 1; *ptr; ptr++) {
+		if (*ptr == '/') {
+			*ptr = 0;
+			xmkdir1(tmp);
+			*ptr = '/';
+		}
+	}
+	xmkdir1(tmp);
+}
+
+void xmkdir2(const char *base, const char *name)
+{
+	char path[PATH_MAX];
+
+	slprintf(path, sizeof(path), "%s/%s", base, name);
+	xmkdir1(path);
+}
+
+int xread_file(const char *file, char *to, size_t len, bool fatal)
+{
+	loff_t ret;
+	int fd;
+
+	fd = open(file, O_RDONLY);
+	if (fd < 0) {
+		if (fatal)
+			panic("Cannot open %s: %s", file, strerror(errno));
+		else
+			return fd;
+	}
+
+	do {
+		ret = read(fd, to, len);
+		if (ret < 0) {
+			if (fatal) {
+				panic("Cannot read file %s: %s", file,
+				      strerror(errno));
+			} else {
+				close(fd);
+				return -1;
+			}
+		}
+		to  += ret;
+		len -= ret;
+	} while (len > 0);
+
+	close(fd);
+	return 0;
+}
+
+int xwrite_file(const char *file, const char *to, size_t len, bool fatal)
+{
+	loff_t ret;
+	int fd;
+
+	fd = open(file, O_CREAT | O_WRONLY | O_TRUNC, 0600);
+	if (fd < 0) {
+		if (fatal)
+			panic("Cannot open %s: %s", file, strerror(errno));
+		else
+			return fd;
+	}
+
+	do {
+		ret = write(fd, to, len);
+		if (ret < 0) {
+			if (fatal) {
+				panic("Cannot write file %s: %s", file,
+				      strerror(errno));
+			} else {
+				close(fd);
+				return -1;
+			}
+		}
+		to  += ret;
+		len -= ret;
+	} while (len > 0);
+
+	close(fd);
+	return 0;
+}
+
+int timeval_sub(struct timeval *res, struct timeval *x,
+		struct timeval *y)
+{
+	if (x->tv_usec < y->tv_usec) {
+		int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
+
+		y->tv_usec -= 1000000 * nsec;
+		y->tv_sec += nsec;
+	}
+
+	if (x->tv_usec - y->tv_usec > 1000000) {
+		int nsec = (x->tv_usec - y->tv_usec) / 1000000;
+
+		y->tv_usec += 1000000 * nsec;
+		y->tv_sec -= nsec;
+	}
+
+	res->tv_sec  = x->tv_sec  - y->tv_sec;
+	res->tv_usec = x->tv_usec - y->tv_usec;
+
+	return x->tv_sec < y->tv_sec;
+}
+
+size_t strlcpy(char *dest, const char *src, size_t size)
+{
+	size_t ret = strlen(src);
+
+	if (size) {
+		size_t len = (ret >= size) ? size - 1 : ret;
+
+		memcpy(dest, src, len);
+		dest[len] = '\0';
+	}
+
+	return ret;
+}
+
+static inline int vslprintf(char *dst, size_t size, const char *fmt, va_list ap)
+{
+	int ret;
+
+	ret = vsnprintf(dst, size, fmt, ap);
+	dst[size - 1] = '\0';
+
+	return ret;
+}
+
+int slprintf(char *dst, size_t size, const char *fmt, ...)
+{
+	va_list ap;
+	int ret;
+
+	va_start(ap, fmt);
+	ret = vslprintf(dst, size, fmt, ap);
+	va_end(ap);
+
+	return ret;
+}
+
+void die(void)
+{
+	exit(EXIT_FAILURE);
+}
+
+void panic(const char *format, ...)
+{
+	va_list vl;
+
+	va_start(vl, format);
+	vfprintf(stderr, format, vl);
+	va_end(vl);
+
+	die();
+}
+
+void warn(const char *format, ...)
+{
+	va_list vl;
+
+	va_start(vl, format);
+	vfprintf(stderr, format, vl);
+	va_end(vl);
+}
+
+void verbose(const char *format, ...)
+{
+	va_list vl;
+
+	if (verbose_enabled) {
+		va_start(vl, format);
+		vfprintf(stdout, format, vl);
+		va_end(vl);
+	}
+}