Hey Zbyszek, Zbigniew Jędrzejewski-Szmek [2014-10-24 19:45 +0200]: > This enumeration is also used below... The definition should be shared. > You might want to also consider using NULSTR_FOREACH for iteration.
Ah, thanks for pointing that out. > This function should have the prototype of 'int open_hwdb_bin(const char > **path, FILE *file)' > and return a proper value on error. Right now the return value is passed > through errno, which works but is inelegant. OK. Personally I prefer "ret < 0" and errno as that's the standard POSIX way and also allows using %m etc., but if strerror(-retval) is the systemd style, fair enough. The updated patch fixes both now. Thanks, Martin -- Martin Pitt | http://www.piware.de Ubuntu Developer (www.ubuntu.com) | Debian Developer (www.debian.org)
From 1624d949c60a911f7bf578d0141c8cd0d98c54e9 Mon Sep 17 00:00:00 2001
From: Martin Pitt <martin.p...@ubuntu.com>
Date: Fri, 17 Oct 2014 15:01:01 +0200
Subject: [PATCH] udev hwdb: Support shipping pre-compiled database in system
images
In some cases it is preferable to ship system images with a pre-generated
binary hwdb database, to avoid having to build it at runtime, avoid shipping
the source hwdb files, or avoid storing large binary files in /etc.
So if hwdb.bin does not exist in /etc/udev/, fall back to looking for it in
UDEVLIBEXECDIR. This keeps the possibility to add files to /etc/udev/hwdb.d/
and re-generating the database which trumps the one in /usr/lib.
Add a new --vendor flag to "udevadm hwdb --update" which puts the database
into UDEVLIBEXECDIR.
Adjust systemd-udev-hwdb-update.service to not generate the file in /etc if we
already have it in /usr.
---
man/udev.xml | 4 ++-
man/udevadm.xml | 9 ++++++
src/libudev/libudev-hwdb.c | 46 ++++++++++++++++++++++++++-----
src/udev/udevadm-hwdb.c | 13 ++++++++-
units/systemd-udev-hwdb-update.service.in | 3 ++
5 files changed, 66 insertions(+), 9 deletions(-)
diff --git a/man/udev.xml b/man/udev.xml
index d77cbb0..87c16c7 100644
--- a/man/udev.xml
+++ b/man/udev.xml
@@ -766,7 +766,9 @@
<para>The content of all hwdb files is read by
<citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- and compiled to a binary database located at <filename>/etc/udev/hwdb.bin</filename>.
+ and compiled to a binary database located at <filename>/etc/udev/hwdb.bin</filename>,
+ or alternatively <filename>/usr/lib/udev/hwdb.bin</filename> if you want ship the compiled
+ database in an immutable image.
During runtime only the binary database is used.</para>
</refsect1>
diff --git a/man/udevadm.xml b/man/udevadm.xml
index 749144d..571ef7d 100644
--- a/man/udevadm.xml
+++ b/man/udevadm.xml
@@ -494,6 +494,15 @@
</listitem>
</varlistentry>
<varlistentry>
+ <term><option>--vendor</option></term>
+ <listitem>
+ <para>Put the compiled database into <filename>/usr/lib/udev/hwdb.bin</filename> instead.
+ Use this if you want to ship a pre-compiled database in immutable system images, or
+ don't use <filename>/etc/udev/hwdb.d</filename> and want to avoid large binary files in
+ <filename>/etc</filename>.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
<term><option>-t</option></term>
<term><option>--test=<replaceable>string</replaceable></option></term>
<listitem>
diff --git a/src/libudev/libudev-hwdb.c b/src/libudev/libudev-hwdb.c
index 8fb7240..ed8cdff 100644
--- a/src/libudev/libudev-hwdb.c
+++ b/src/libudev/libudev-hwdb.c
@@ -256,6 +256,25 @@ static int trie_search_f(struct udev_hwdb *hwdb, const char *search) {
return 0;
}
+static const char hwdb_bin_paths[] =
+ "/etc/udev/hwdb.bin\0"
+ UDEVLIBEXECDIR "/hwdb.bin\0";
+
+
+static int open_hwdb_bin(const char **path, FILE** f) {
+ const char* p;
+
+ NULSTR_FOREACH(p, hwdb_bin_paths) {
+ *path = p;
+ *f = fopen(p, "re");
+ if (*f)
+ return 0;
+ else if (errno != ENOENT)
+ return -errno;
+ }
+ return -errno;
+}
+
/**
* udev_hwdb_new:
* @udev: udev library context
@@ -266,6 +285,8 @@ static int trie_search_f(struct udev_hwdb *hwdb, const char *search) {
**/
_public_ struct udev_hwdb *udev_hwdb_new(struct udev *udev) {
struct udev_hwdb *hwdb;
+ int r;
+ const char *hwdb_bin_path;
const char sig[] = HWDB_SIG;
hwdb = new0(struct udev_hwdb, 1);
@@ -275,30 +296,30 @@ _public_ struct udev_hwdb *udev_hwdb_new(struct udev *udev) {
hwdb->refcount = 1;
udev_list_init(udev, &hwdb->properties_list, true);
- hwdb->f = fopen("/etc/udev/hwdb.bin", "re");
- if (!hwdb->f) {
- udev_dbg(udev, "error reading /etc/udev/hwdb.bin: %m");
+ r = open_hwdb_bin(&hwdb_bin_path, &hwdb->f);
+ if (r < 0) {
+ udev_dbg(udev, "error reading %s: %s", hwdb_bin_path, strerror(-r));
udev_hwdb_unref(hwdb);
return NULL;
}
if (fstat(fileno(hwdb->f), &hwdb->st) < 0 ||
(size_t)hwdb->st.st_size < offsetof(struct trie_header_f, strings_len) + 8) {
- udev_dbg(udev, "error reading /etc/udev/hwdb.bin: %m");
+ udev_dbg(udev, "error reading %s: %m", hwdb_bin_path);
udev_hwdb_unref(hwdb);
return NULL;
}
hwdb->map = mmap(0, hwdb->st.st_size, PROT_READ, MAP_SHARED, fileno(hwdb->f), 0);
if (hwdb->map == MAP_FAILED) {
- udev_dbg(udev, "error mapping /etc/udev/hwdb.bin: %m");
+ udev_dbg(udev, "error mapping %s: %m", hwdb_bin_path);
udev_hwdb_unref(hwdb);
return NULL;
}
if (memcmp(hwdb->map, sig, sizeof(hwdb->head->signature)) != 0 ||
(size_t)hwdb->st.st_size != le64toh(hwdb->head->file_size)) {
- udev_dbg(udev, "error recognizing the format of /etc/udev/hwdb.bin");
+ udev_dbg(udev, "error recognizing the format of %s", hwdb_bin_path);
udev_hwdb_unref(hwdb);
return NULL;
}
@@ -352,14 +373,25 @@ _public_ struct udev_hwdb *udev_hwdb_unref(struct udev_hwdb *hwdb) {
}
bool udev_hwdb_validate(struct udev_hwdb *hwdb) {
+ bool found = false;
+ const char* p;
struct stat st;
if (!hwdb)
return false;
if (!hwdb->f)
return false;
- if (stat("/etc/udev/hwdb.bin", &st) < 0)
+
+ /* if hwdb.bin doesn't exist anywhere, we need to update */
+ NULSTR_FOREACH(p, hwdb_bin_paths) {
+ if (stat(p, &st) >= 0) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
return true;
+
if (timespec_load(&hwdb->st.st_mtim) != timespec_load(&st.st_mtim))
return true;
return false;
diff --git a/src/udev/udevadm-hwdb.c b/src/udev/udevadm-hwdb.c
index 64273fb..017eda9 100644
--- a/src/udev/udevadm-hwdb.c
+++ b/src/udev/udevadm-hwdb.c
@@ -536,14 +536,20 @@ static int import_file(struct udev *udev, struct trie *trie, const char *filenam
static void help(void) {
printf("Usage: udevadm hwdb OPTIONS\n"
" -u,--update update the hardware database\n"
+ " --vendor generate in " UDEVLIBEXECDIR " instead of /etc/udev\n"
" -t,--test=MODALIAS query database and print result\n"
" -r,--root=PATH alternative root path in the filesystem\n"
" -h,--help\n\n");
}
static int adm_hwdb(struct udev *udev, int argc, char *argv[]) {
+ enum {
+ ARG_VENDOR = 0x100,
+ };
+
static const struct option options[] = {
{ "update", no_argument, NULL, 'u' },
+ { "vendor", no_argument, NULL, ARG_VENDOR },
{ "test", required_argument, NULL, 't' },
{ "root", required_argument, NULL, 'r' },
{ "help", no_argument, NULL, 'h' },
@@ -551,6 +557,7 @@ static int adm_hwdb(struct udev *udev, int argc, char *argv[]) {
};
const char *test = NULL;
const char *root = "";
+ const char *hwdb_bin_dir = "/etc/udev";
bool update = false;
struct trie *trie = NULL;
int err, c;
@@ -561,6 +568,9 @@ static int adm_hwdb(struct udev *udev, int argc, char *argv[]) {
case 'u':
update = true;
break;
+ case ARG_VENDOR:
+ hwdb_bin_dir = UDEVLIBEXECDIR;
+ break;
case 't':
test = optarg;
break;
@@ -634,7 +644,8 @@ static int adm_hwdb(struct udev *udev, int argc, char *argv[]) {
log_debug("strings dedup'ed: %8zu bytes (%8zu)",
trie->strings->dedup_len, trie->strings->dedup_count);
- if (asprintf(&hwdb_bin, "%s/etc/udev/hwdb.bin", root) < 0) {
+ hwdb_bin = strjoin(root, "/", hwdb_bin_dir, "/hwdb.bin", NULL);
+ if (!hwdb_bin) {
rc = EXIT_FAILURE;
goto out;
}
diff --git a/units/systemd-udev-hwdb-update.service.in b/units/systemd-udev-hwdb-update.service.in
index cdbcd83..5b1f75d 100644
--- a/units/systemd-udev-hwdb-update.service.in
+++ b/units/systemd-udev-hwdb-update.service.in
@@ -13,6 +13,9 @@ Conflicts=shutdown.target
After=systemd-remount-fs.service
Before=sysinit.target shutdown.target systemd-update-done.service
ConditionNeedsUpdate=/etc
+ConditionPathExists=|!@udevlibexecdir@/hwdb.bin
+ConditionPathExists=|/etc/udev/hwdb.bin
+ConditionDirectoryNotEmpty=|/etc/udev/hwdb.d/
[Service]
Type=oneshot
--
2.1.0
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