start-stop-daemon: add -d DIR chdir option

Add option to change the running directory before starting the process.
This can be done using -d or --chdir options. Add also test cases to
start-stop-daemon to test out the directory change option.

function                                             old     new   delta
packed_usage                                       34602   34648     +46
start_stop_daemon_main                              1107    1130     +23
start_stop_daemon_longopts                           156     164      +8
.rodata                                           105382  105384      +2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/0 up/down: 79/0)               Total: 79 bytes

Signed-off-by: ejaaskel <esa.jaaskela@suomi24.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/testsuite/start-stop-daemon.tests b/testsuite/start-stop-daemon.tests
index 0757b1288..e1e49ab5f 100755
--- a/testsuite/start-stop-daemon.tests
+++ b/testsuite/start-stop-daemon.tests
@@ -11,6 +11,21 @@ testing "start-stop-daemon -x without -a" \
         "0\n" \
         "" ""
 
+testing "start-stop-daemon -x with -d on existing directory" \
+        'start-stop-daemon -S -d /tmp -x true 2>&1; echo $?' \
+        "0\n" \
+        "" ""
+
+testing "start-stop-daemon -x with -d on existing and check dir" \
+        'output=$(start-stop-daemon -S -d /tmp -x pwd); echo $output' \
+        "/tmp\n" \
+        "" ""
+
+testing "start-stop-daemon -x with --chdir on existing and check dir" \
+        'output=$(start-stop-daemon -S --chdir /tmp -x pwd); echo $output' \
+        "/tmp\n" \
+        "" ""
+
 testing "start-stop-daemon -a without -x" \
         'start-stop-daemon -S -a false 2>&1; echo $?' \
         "1\n" \
@@ -21,6 +36,11 @@ testing "start-stop-daemon without -x and -a" \
         "1\n" \
         "" ""
 
+testing "start-stop-daemon -x with -d on non-existing directory" \
+        'start-stop-daemon -S -d /non-existent -x true > /dev/null 2>&1; echo $?' \
+        "1\n" \
+        "" ""
+
 # This runs /bin/false with argv[0..2] of { "qwerty", "false", NULL }.
 #
 # Unfortunately, this does not actually check argv[0] correctness,