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init: Add tests and document the new fnmatch behavior in ExternalFirmwareHandler.

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Bug: N/A
Test: atest CtsInitTestCases
Change-Id: I232db8416318ba31ea3f78cc07f235d9a47efac4
This commit is contained in:
David Anderson 2021-04-16 13:33:56 -07:00
parent 22fdd0ae13
commit 19872d0156
2 changed files with 21 additions and 0 deletions
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4
init/README.ueventd.md
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@ -130,6 +130,10 @@ For example
Will launch `/vendor/bin/led_coeffs.bin` as the system user instead of serving the default firmware
for `/devices/leds/red/firmware/coeffs.bin`.
The `devpath` argument may include asterisks (`*`) to match multiple paths. For example, the string
`/dev/*/red` will match `/dev/leds/red` as well as `/dev/lights/red`. The pattern matching follows
the rules of the fnmatch() function.
Ueventd will provide the uevent `DEVPATH` and `FIRMWARE` to this external program on the environment
via environment variables with the same names. Ueventd will use the string written to stdout as the
new name of the firmware to load. It will still look for the new firmware in the list of firmware

17
init/firmware_handler_test.cpp
View file

@ -103,6 +103,23 @@ int HandleBadPath(int argc, char** argv) {
return 0;
}
TEST(firmware_handler, Matching) {
ExternalFirmwareHandler h("/dev/path/a.bin", getuid(), "/test");
ASSERT_TRUE(h.match("/dev/path/a.bin"));
ASSERT_FALSE(h.match("/dev/path/a.bi"));
h = ExternalFirmwareHandler("/dev/path/a.*", getuid(), "/test");
ASSERT_TRUE(h.match("/dev/path/a.bin"));
ASSERT_TRUE(h.match("/dev/path/a.bix"));
ASSERT_FALSE(h.match("/dev/path/b.bin"));
h = ExternalFirmwareHandler("/dev/*/a.bin", getuid(), "/test");
ASSERT_TRUE(h.match("/dev/path/a.bin"));
ASSERT_TRUE(h.match("/dev/other/a.bin"));
ASSERT_FALSE(h.match("/dev/other/c.bin"));
ASSERT_FALSE(h.match("/dev/path/b.bin"));
}
} // namespace init
} // namespace android