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files: ignore conflict when files are identical 

When the target file exists but has the exact same content then we
will now skip creation of the link from the source file.

Fixes #1213
This commit is contained in:
piegames 2020-05-19 14:44:44 +02:00 committed by Robert Helgesson
parent 7c19bcb822
commit 7f976da068
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1 changed files with 17 additions and 3 deletions
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modules/files.nix
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@ -106,7 +106,12 @@ in
$VERBOSE_ECHO "Skipping collision check for $targetPath"
elif [[ -e "$targetPath" \
&& ! "$(readlink "$targetPath")" == $homeFilePattern ]] ; then
if [[ ! -L "$targetPath" && -n "$HOME_MANAGER_BACKUP_EXT" ]] ; then
# The target file already exists and it isn't a symlink owned by Home Manager.
if cmp -s $sourcePath $targetPath; then
# First compare the files' content. If they're equal, we're fine.
warnEcho "Existing file '$targetPath' is in the way of '$sourcePath', will be skipped since they are the same"
elif [[ ! -L "$targetPath" && -n "$HOME_MANAGER_BACKUP_EXT" ]] ; then
# Next, try to move the file to a backup location if configured and possible
backup="$targetPath.$HOME_MANAGER_BACKUP_EXT"
if [[ -e "$backup" ]]; then
errorEcho "Existing file '$backup' would be clobbered by backing up '$targetPath'"
@ -115,6 +120,7 @@ in
warnEcho "Existing file '$targetPath' is in the way of '$sourcePath', will be moved to '$backup'"
fi
else
# Fail if nothing else works
errorEcho "Existing file '$targetPath' is in the way of '$sourcePath'"
collision=1
fi
@ -169,11 +175,19 @@ in
relativePath="''${sourcePath#$newGenFiles/}"
targetPath="$HOME/$relativePath"
if [[ -e "$targetPath" && ! -L "$targetPath" && -n "$HOME_MANAGER_BACKUP_EXT" ]] ; then
# The target exists, back it up
backup="$targetPath.$HOME_MANAGER_BACKUP_EXT"
$DRY_RUN_CMD mv $VERBOSE_ARG "$targetPath" "$backup" || errorEcho "Moving '$targetPath' failed!"
fi
$DRY_RUN_CMD mkdir -p $VERBOSE_ARG "$(dirname "$targetPath")"
$DRY_RUN_CMD ln -nsf $VERBOSE_ARG "$sourcePath" "$targetPath"
if [[ -e "$targetPath" && ! -L "$targetPath" ]] && cmp -s $sourcePath $targetPath ; then
# The target exists but is identical – don't do anything.
$VERBOSE_ECHO "Skipping '$targetPath' as it is identical to '$sourcePath'"
else
# Place that symlink, --force
$DRY_RUN_CMD mkdir -p $VERBOSE_ARG "$(dirname "$targetPath")"
$DRY_RUN_CMD ln -nsf $VERBOSE_ARG "$sourcePath" "$targetPath"
fi
done
'';