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From af5ef029fe96a8703a1de7a60063c473d17d37a4 Mon Sep 17 00:00:00 2001
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From: Martin Kutlak <mkutlak@redhat.com>
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Date: Tue, 21 May 2019 10:45:55 +0200
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Subject: [PATCH] dd: introduce dd_get_env_variable
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I was thinking about adding 'dd_open_element' function returning file
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descriptor but I thrown this idea because we should try to hide
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implementation details and do not let users to parse elements on their
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own.
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Cherry-picked from https://github.com/abrt/libreport/commit/a1d7a0397b8251be58783dd5e8665099bf8ce868
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---
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src/include/dump_dir.h | 11 +++++++++++
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src/lib/dump_dir.c | 11 +++++++++++
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tests/dump_dir.at | 31 +++++++++++++++++++++++++++++++
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3 files changed, 53 insertions(+)
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diff --git a/src/include/dump_dir.h b/src/include/dump_dir.h
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index b617c6c..a7ed431 100644
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--- a/src/include/dump_dir.h
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+++ b/src/include/dump_dir.h
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@@ -118,6 +118,17 @@ int dd_get_next_file(struct dump_dir *dd, char **short_name, char **full_name);
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char* dd_load_text_ext(const struct dump_dir *dd, const char *name, unsigned flags);
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char* dd_load_text(const struct dump_dir *dd, const char *name);
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+
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+/* Returns value of environment variable with given name.
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+ *
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+ * @param dd Dump directory
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+ * @param name Variables's name
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+ * @param value Return value.
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+ * @return 0 no success, or negative value if an error occurred (-ENOENT if the
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+ * given dd does not support environment variables).
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+ */
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+int dd_get_env_variable(struct dump_dir *dd, const char *name, char **value);
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+
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void dd_save_text(struct dump_dir *dd, const char *name, const char *data);
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void dd_save_binary(struct dump_dir *dd, const char *name, const char *data, unsigned size);
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int dd_copy_file(struct dump_dir *dd, const char *name, const char *source_path);
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diff --git a/src/lib/dump_dir.c b/src/lib/dump_dir.c
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index 5e32c08..0da96cd 100644
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--- a/src/lib/dump_dir.c
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+++ b/src/lib/dump_dir.c
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@@ -1242,6 +1242,17 @@ char* dd_load_text(const struct dump_dir *dd, const char *name)
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return dd_load_text_ext(dd, name, /*flags:*/ 0);
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}
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+int dd_get_env_variable(struct dump_dir *dd, const char *name, char **value)
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+{
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+ const int fd = openat(dd->dd_fd, FILENAME_ENVIRON, O_RDONLY | O_NOFOLLOW);
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+ if (fd < 0)
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+ return -errno;
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+
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+ const int r = get_env_variable_ext(fd, '\n', name, value);
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+ close(fd);
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+ return r;
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+}
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+
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void dd_save_text(struct dump_dir *dd, const char *name, const char *data)
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{
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if (!dd->locked)
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diff --git a/tests/dump_dir.at b/tests/dump_dir.at
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index 98d564c..12a0c5c 100644
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--- a/tests/dump_dir.at
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+++ b/tests/dump_dir.at
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@@ -615,3 +615,34 @@ int main(int argc, char **argv)
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return 0;
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}
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]])
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+## ------------------- ##
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+## dd_get_env_variable ##
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+## ------------------- ##
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+
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+AT_TESTFUN([dd_get_env_variable],
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+[[
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+#include "testsuite.h"
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+#include "testsuite_tools.h"
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+
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+TS_MAIN
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+{
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+ struct dump_dir *dd = testsuite_dump_dir_create(-1, -1, 0);
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+
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+ dd_create_basic_files(dd, geteuid(), NULL);
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+
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+ char *value = NULL;
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+ TS_ASSERT_SIGNED_EQ(dd_get_env_variable(dd, "FROG", &value), -ENOENT);
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+ TS_ASSERT_PTR_IS_NULL_MESSAGE(value, "Untouched return value on -ENOENT");
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+
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+ dd_save_text(dd, FILENAME_ENVIRON, "FROG=ribbit\nROOSTER=cockle-doodle-doo");
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+
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+ TS_ASSERT_FUNCTION(dd_get_env_variable(dd, "HORSE", &value));
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+ TS_ASSERT_PTR_IS_NULL_MESSAGE(value, "Untouched return value on missing variable");
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+
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+ TS_ASSERT_FUNCTION(dd_get_env_variable(dd, "ROOSTER", &value));
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+ TS_ASSERT_STRING_EQ(value, "cockle-doodle-doo", "Variable ROOSTER loaded from the dump dir");
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+
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+ testsuite_dump_dir_delete(dd);
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+}
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+TS_RETURN_MAIN
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+]])
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--
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2.21.0
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