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saveconfig: open the temp configfile with modes set #162

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merged 2 commits into from May 28, 2020

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pkalever
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@pkalever pkalever commented May 28, 2020

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>

Fixes: open-iscsi#161
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
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Thanks to https://stackoverflow.com/a/15015748, which made my life easy.

shutil.copyfile() will not copy permissions, so all the perms that we
set on tempfile will go for a toss, and will be reset to default

┌──────────────────┬────────┬───────────┬───────┬────────────────┐
│     Function     │ Copies │   Copies  │Can use│   Destination  │
│                  │metadata│permissions│buffer │may be directory│
├──────────────────┼────────┼───────────┼───────┼────────────────┤
│shutil.copy       │   No   │    Yes    │   No  │      Yes       │
│shutil.copyfile   │   No   │     No    │   No  │       No       │
│shutil.copy2      │  Yes   │    Yes    │   No  │      Yes       │
│shutil.copyfileobj│   No   │     No    │  Yes  │       No       │
└──────────────────┴────────┴───────────┴───────┴────────────────┘

Without this fix:
----------------
$ ls /etc/target/saveconfig.json -l
-rw-r--r-- 1 root root 5078 May 28 20:01 /etc/target/saveconfig.json

With this fix:
--------------
$ ls /etc/target/saveconfig.json -l
-rw------- 1 root root 5078 May 28 20:15 /etc/target/saveconfig.json

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
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