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From 3ce9a9b286825793548ed7a7673dd9674a4e4137 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Nykr=C3=BDn?= <lnykryn@redhat.com>
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Date: Fri, 1 Dec 2017 20:34:49 +0100
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Subject: [PATCH] shared/dropin: ignore ENAMETOOLONG when checking drop-in
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 directories (#7525)
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This usually happens for device units with long
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path in /sys. But users can't even create such drop-ins,
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so lets just ignore the error here.
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Fixes #6867
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Cherry-picked from: dfeec916b57b593ce07d3751aebdb0cce1d05201
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Resolves: #1489095
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---
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 src/shared/dropin.c | 8 ++++++--
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 1 file changed, 6 insertions(+), 2 deletions(-)
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diff --git a/src/shared/dropin.c b/src/shared/dropin.c
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index d1baad6192..b674d307a2 100644
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--- a/src/shared/dropin.c
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+++ b/src/shared/dropin.c
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@@ -129,8 +129,12 @@ static int iterate_dir(
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         d = opendir(path);
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         if (!d) {
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-                if (errno == ENOENT)
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-                        return 0;
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+                /* Ignore ENOENT, after all most units won't have a drop-in dir.
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+                 * Also ignore ENAMETOOLONG, users are not even able to create
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+                 * the drop-in dir in such case. This mostly happens for device units with long /sys path.
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+                 * */
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+                if (IN_SET(errno, ENOENT, ENAMETOOLONG))
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+                            return 0;
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                 log_error_errno(errno, "Failed to open directory %s: %m", path);
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                 return -errno;