From e9abe09809097b431cf2acc50066435ea2cc0a53 Mon Sep 17 00:00:00 2001 From: Michael Keppler Date: Sun, 29 Jul 2018 07:53:11 +0200 Subject: [PATCH] Retry loading config when locked by another process When loading the config, a FileNotFoundException may occur if the file exists but cannot be read (see [1]). This is the case on Windows with a virus scanner checking the file. Therefore if the file exists and that exception is thrown, retry multiple times, similar to how this was already implemented for IOException. [1] https://docs.oracle.com/javase/8/docs/api/java/io/FileNotFoundException.html Bug: 529522 Change-Id: Ic5dc3b7b24bb0005d6256ed00513bc7c0b91e613 Signed-off-by: Michael Keppler Signed-off-by: Matthias Sohn --- .../eclipse/jgit/internal/JGitText.properties | 1 + .../org/eclipse/jgit/internal/JGitText.java | 1 + .../jgit/storage/file/FileBasedConfig.java | 21 +++++++++++++++++-- 3 files changed, 21 insertions(+), 2 deletions(-) diff --git a/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties b/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties index afa876174..df42dc757 100644 --- a/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties +++ b/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties @@ -139,6 +139,7 @@ configSubsectionContainsNewline=config subsection name contains newline configSubsectionContainsNullByte=config subsection name contains byte 0x00 configValueContainsNullByte=config value contains byte 0x00 configHandleIsStale=config file handle is stale, {0}. retry +configHandleMayBeLocked=config file handle may be locked by other process, {0}. retry connectionFailed=connection failed connectionTimeOut=Connection time out: {0} contextMustBeNonNegative=context must be >= 0 diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java index 4d0d05156..bdaef5a36 100644 --- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java +++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java @@ -200,6 +200,7 @@ public class JGitText extends TranslationBundle { /***/ public String configSubsectionContainsNullByte; /***/ public String configValueContainsNullByte; /***/ public String configHandleIsStale; + /***/ public String configHandleMayBeLocked; /***/ public String connectionFailed; /***/ public String connectionTimeOut; /***/ public String contextMustBeNonNegative; diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/storage/file/FileBasedConfig.java b/org.eclipse.jgit/src/org/eclipse/jgit/storage/file/FileBasedConfig.java index 2b31ebd8e..fc6f4a39c 100644 --- a/org.eclipse.jgit/src/org/eclipse/jgit/storage/file/FileBasedConfig.java +++ b/org.eclipse.jgit/src/org/eclipse/jgit/storage/file/FileBasedConfig.java @@ -148,7 +148,8 @@ public class FileBasedConfig extends StoredConfig { */ @Override public void load() throws IOException, ConfigInvalidException { - final int maxStaleRetries = 5; + final int maxRetries = 5; + int retryDelayMillis = 20; int retries = 0; while (true) { final FileSnapshot oldSnapshot = snapshot; @@ -177,6 +178,22 @@ public class FileBasedConfig extends StoredConfig { } return; } catch (FileNotFoundException noFile) { + // might be locked by another process (see exception Javadoc) + if (retries < maxRetries && configFile.exists()) { + if (LOG.isDebugEnabled()) { + LOG.debug(MessageFormat.format( + JGitText.get().configHandleMayBeLocked, + Integer.valueOf(retries)), noFile); + } + try { + Thread.sleep(retryDelayMillis); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + } + retries++; + retryDelayMillis *= 2; // max wait 1260 ms + continue; + } if (configFile.exists()) { throw noFile; } @@ -185,7 +202,7 @@ public class FileBasedConfig extends StoredConfig { return; } catch (IOException e) { if (FileUtils.isStaleFileHandle(e) - && retries < maxStaleRetries) { + && retries < maxRetries) { if (LOG.isDebugEnabled()) { LOG.debug(MessageFormat.format( JGitText.get().configHandleIsStale,