package_rpm: Check if file exists before open()

Exception handler tries to read() /etc/passwd file in sysroot
and if file doesn't exist for any reason then it raises FileNotFoundError
exception which mask the original source of the problem and makes
debugging of the issue more difficult.

Fixes:
Exception: FileNotFoundError: [Errno 2] No such file or directory:
'/codebuild/output/src1899304708/src/build/tmp-container/work/core2-64-oe-linux/emqx-bin/4.3.12/recipe-sysroot/etc/passwd'

(From OE-Core rev: 4ad9a0e0b11eb7bc5a3dd45fc8945e094ea949e9)

Signed-off-by: Pavel Zhukov <pavel@zhukoff.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 12 insertions, 4 deletions

diff --git a/meta/classes-global/package_rpm.bbclass b/meta/classes-global/package_rpm.bbclass
index 474d2491eb..ddc4bf3a6a 100644
--- a/meta/classes-global/package_rpm.bbclass
+++ b/meta/classes-global/package_rpm.bbclass
@@ -201,14 +201,22 @@ python write_specfile () {
                 try:
                     owner = pwd.getpwuid(stat_f.st_uid).pw_name
                 except Exception as e:
-                    bb.error("Content of /etc/passwd in sysroot:\n{}".format(
-                        open(d.getVar("RECIPE_SYSROOT") +"/etc/passwd").read()))
+                    filename = d.getVar('RECIPE_SYSROOT') + '/etc/passwd'
+                    if os.path.exists(filename):
+                        bb.error("Content of /etc/passwd in sysroot:\n{}".format(
+                            open(filename).read()))
+                    else:
+                        bb.error("File {} doesn't exist in sysroot!".format(filename))
                     raise e
                 try:
                     group = grp.getgrgid(stat_f.st_gid).gr_name
                 except Exception as e:
-                    bb.error("Content of /etc/group in sysroot:\n{}".format(
-                        open(d.getVar("RECIPE_SYSROOT") +"/etc/group").read()))
+                    filename = d.getVar("RECIPE_SYSROOT") +"/etc/group"
+                    if os.path.exists(filename):
+                        bb.error("Content of /etc/group in sysroot:\n{}".format(
+                            open(filename).read()))
+                    else:
+                        bb.error("File {} doesn't exists in sysroot!".format(filename))
                     raise e
                 return "%attr({:o},{},{}) ".format(mode, owner, group)