138 lines
6.3 KiB
Diff
138 lines
6.3 KiB
Diff
From ddaf24341a512a9891226e85c13d51d7e2cfcb01 Mon Sep 17 00:00:00 2001
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From: David Tardon <dtardon@redhat.com>
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Date: Tue, 10 Aug 2021 14:46:16 +0200
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Subject: [PATCH] Revert "udev: remove WAIT_FOR key"
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This reverts commit f2b8052fb648b788936dd3e85be6a9aca90fbb2f.
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RHEL-only
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Related: #2138081
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---
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man/udev.xml | 9 +++++++
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src/udev/udev-rules.c | 56 +++++++++++++++++++++++++++++++++++++++
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test/rule-syntax-check.py | 2 +-
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3 files changed, 66 insertions(+), 1 deletion(-)
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diff --git a/man/udev.xml b/man/udev.xml
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index 142f295f3e..5b096c7ef2 100644
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--- a/man/udev.xml
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+++ b/man/udev.xml
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@@ -592,6 +592,15 @@
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</listitem>
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</varlistentry>
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+ <varlistentry>
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+ <term><varname>WAIT_FOR</varname></term>
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+ <listitem>
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+ <para>Wait for a file to become available or until a timeout of
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+ 10 seconds expires. The path is relative to the sysfs device;
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+ if no path is specified, this waits for an attribute to appear.</para>
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+ </listitem>
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+ </varlistentry>
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+
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<varlistentry>
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<term><varname>OPTIONS</varname></term>
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<listitem>
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diff --git a/src/udev/udev-rules.c b/src/udev/udev-rules.c
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index f44a174d1f..a8473041c3 100644
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--- a/src/udev/udev-rules.c
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+++ b/src/udev/udev-rules.c
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@@ -79,6 +79,7 @@ typedef enum {
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TK_M_TAG, /* strv, sd_device_get_tag_first(), sd_device_get_tag_next() */
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TK_M_SUBSYSTEM, /* string, sd_device_get_subsystem() */
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TK_M_DRIVER, /* string, sd_device_get_driver() */
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+ TK_M_WAITFOR,
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TK_M_ATTR, /* string, takes filename through attribute, sd_device_get_sysattr_value(), udev_resolve_subsys_kernel(), etc. */
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TK_M_SYSCTL, /* string, takes kernel parameter through attribute */
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@@ -411,6 +412,47 @@ static void rule_line_append_token(UdevRuleLine *rule_line, UdevRuleToken *token
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rule_line->current_token = token;
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}
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+#define WAIT_LOOP_PER_SECOND 50
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+static int wait_for_file(sd_device *dev, const char *file, int timeout) {
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+ char filepath[UDEV_PATH_SIZE];
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+ char devicepath[UDEV_PATH_SIZE];
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+ struct stat stats;
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+ int loop = timeout * WAIT_LOOP_PER_SECOND;
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+
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+ /* a relative path is a device attribute */
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+ devicepath[0] = '\0';
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+ if (file[0] != '/') {
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+ const char *val;
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+ int r;
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+
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+ r = sd_device_get_syspath(dev, &val);
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+ if (r < 0)
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+ return r;
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+ strscpyl(devicepath, sizeof(devicepath), val, NULL);
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+ strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);
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+ file = filepath;
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+ }
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+
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+ while (--loop) {
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+ const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };
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+
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+ /* lookup file */
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+ if (stat(file, &stats) == 0) {
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+ log_debug("file '%s' appeared after %i loops", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
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+ return 0;
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+ }
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+ /* make sure, the device did not disappear in the meantime */
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+ if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
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+ log_debug("device disappeared while waiting for '%s'", file);
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+ return -2;
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+ }
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+ log_debug("wait for '%s' for %i mseconds", file, 1000 / WAIT_LOOP_PER_SECOND);
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+ nanosleep(&duration, NULL);
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+ }
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+ log_debug("waiting for '%s' failed", file);
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+ return -1;
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+}
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+
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static int rule_line_add_token(UdevRuleLine *rule_line, UdevRuleTokenType type, UdevRuleOperatorType op, char *value, void *data) {
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UdevRuleToken *token;
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UdevRuleMatchType match_type = _MATCH_TYPE_INVALID;
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@@ -953,6 +995,12 @@ static int parse_token(UdevRules *rules, const char *key, char *attr, UdevRuleOp
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r = rule_line_add_token(rule_line, TK_A_RUN_BUILTIN, op, value, UDEV_BUILTIN_CMD_TO_PTR(cmd));
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} else
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return log_token_invalid_attr(rules, key);
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+ } else if (streq(key, "WAIT_FOR") || streq(key, "WAIT_FOR_SYSFS")) {
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+ if (op == OP_REMOVE)
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+ return log_token_invalid_op(rules, key);
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+
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+ rule_line_add_token(rule_line, TK_M_WAITFOR, 0, value, NULL);
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+ return 1;
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} else if (streq(key, "GOTO")) {
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if (attr)
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return log_token_invalid_attr(rules, key);
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@@ -1670,6 +1718,14 @@ static int udev_rule_apply_token_to_event(
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return token_match_string(token, val);
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}
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+ case TK_M_WAITFOR: {
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+ char filename[UDEV_PATH_SIZE];
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+ int found;
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+
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+ udev_event_apply_format(event, token->value, filename, sizeof(filename), false, NULL);
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+ found = (wait_for_file(event->dev, filename, 10) == 0);
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+ return found || (token->op == OP_NOMATCH);
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+ }
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case TK_M_ATTR:
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case TK_M_PARENTS_ATTR:
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return token_match_attr(rules, token, dev, event);
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diff --git a/test/rule-syntax-check.py b/test/rule-syntax-check.py
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index ec1c75a854..5543931064 100755
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--- a/test/rule-syntax-check.py
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+++ b/test/rule-syntax-check.py
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@@ -18,7 +18,7 @@ no_args_tests = re.compile(r'(ACTION|DEVPATH|KERNELS?|NAME|SYMLINK|SUBSYSTEMS?|D
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# PROGRAM can also be specified as an assignment.
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program_assign = re.compile(r'PROGRAM\s*=\s*' + quoted_string_re + '$')
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args_tests = re.compile(r'(ATTRS?|ENV|CONST|TEST){([a-zA-Z0-9/_.*%-]+)}\s*(?:=|!)=\s*' + quoted_string_re + '$')
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-no_args_assign = re.compile(r'(NAME|SYMLINK|OWNER|GROUP|MODE|TAG|RUN|LABEL|GOTO|OPTIONS|IMPORT)\s*(?:\+=|:=|=)\s*' + quoted_string_re + '$')
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+no_args_assign = re.compile(r'(NAME|SYMLINK|OWNER|GROUP|MODE|TAG|RUN|LABEL|GOTO|WAIT_FOR|OPTIONS|IMPORT)\s*(?:\+=|:=|=)\s*' + quoted_string_re + '$')
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args_assign = re.compile(r'(ATTR|ENV|IMPORT|RUN){([a-zA-Z0-9/_.*%-]+)}\s*(=|\+=)\s*' + quoted_string_re + '$')
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# Find comma-separated groups, but allow commas that are inside quoted strings.
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# Using quoted_string_re + '?' so that strings missing the last double quote
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